/* Second Brain, explained: styles. Sections apply in order; later sections refine earlier ones. */

/* ===================== Base: tokens, layout, chapters, guide ===================== */
/* =========================================================
   Design tokens
   ========================================================= */
:root {
  color-scheme: light;
  --font: "Manrope", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --bg: #fbfbfd; --bg-2: #f2f3f8; --bg-3: #e7e9f2; --surface: #ffffff;
  --ink: #101326; --ink-2: #4b5170; --ink-3: #5c6283; --line: #e5e7f0;
  --brand: #4a55f0; --brand-ink: #3a44d6; --brand-soft: #eef0ff; --brand-fill: #4a55f0;
  --human: #f2763b; --human-ink: #a8481a; --human-soft: #fff1e9;
  --ai: #12b5a6; --ai-ink: #0a776d; --ai-soft: #e6f8f6;
  --danger: #d6363b; --danger-soft: #fdecec; --ok: #1b8a3a; --ok-soft: #e9f7ee;
  --grad: linear-gradient(120deg, #4a55f0 0%, #6b4cf0 55%, #8b46e6 100%);
  --grad-wide: linear-gradient(120deg, #4a55f0, #8b46e6 50%, #12b5a6);
  --shadow-1: 0 1px 2px rgba(16,19,38,.05), 0 2px 8px rgba(16,19,38,.04);
  --shadow-2: 0 4px 10px rgba(16,19,38,.05), 0 18px 40px rgba(16,19,38,.08);
  --shadow-3: 0 30px 80px rgba(16,19,38,.18);
  --r-sm: 10px; --r-md: 16px; --r-lg: 24px; --r-pill: 999px;
  --header: 60px;
  --ease: cubic-bezier(.2,.8,.2,1);
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0c0e1a; --bg-2: #13162a; --bg-3: #1d2140; --surface: #161a31;
  --ink: #eef0fb; --ink-2: #b2b7d2; --ink-3: #959bba; --line: #272b48;
  --brand: #8d95ff; --brand-ink: #a7adff; --brand-soft: #1c2050; --brand-fill: #5560f5;
  --human: #ff9461; --human-ink: #ffb38f; --human-soft: #33201a;
  --ai: #2fd3c3; --ai-ink: #5fe0d3; --ai-soft: #10302d;
  --danger: #ff6b6f; --danger-soft: #3a1a1d; --ok: #4fd27a; --ok-soft: #13301e;
  --shadow-1: 0 1px 2px rgba(0,0,0,.4); --shadow-2: 0 18px 40px rgba(0,0,0,.45); --shadow-3: 0 30px 80px rgba(0,0,0,.6);
}

/* =========================================================
   Base
   ========================================================= */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); font-size: 17px; line-height: 1.65; color: var(--ink); background: var(--bg); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
h1, h2, h3, h4 { margin: 0; letter-spacing: -0.03em; line-height: 1.08; font-weight: 800; }
p { margin: 0 0 1em; }
a { color: var(--brand-ink); }
button { font: inherit; color: inherit; }
.ic { width: 1.1em; height: 1.1em; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; vertical-align: -0.18em; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
:focus-visible { outline: 3px solid color-mix(in oklab, var(--brand) 60%, transparent); outline-offset: 2px; border-radius: 8px; }
.wrap { width: min(1080px, 100% - 40px); margin-inline: auto; }
.narrow { width: min(720px, 100% - 40px); margin-inline: auto; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 48px; padding: 0 22px; border-radius: var(--r-pill); border: 1px solid var(--line); background: var(--surface); color: var(--ink); font-weight: 700; font-size: .95rem; text-decoration: none; cursor: pointer; box-shadow: var(--shadow-1); transition: transform .18s var(--ease), box-shadow .2s, border-color .2s, background .2s; white-space: nowrap; }
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); border-color: color-mix(in oklab, var(--brand) 35%, var(--line)); }
.btn:active { transform: translateY(0); }
.btn.primary { background: var(--grad); color: #fff; border: 0; box-shadow: 0 10px 30px rgba(74,85,240,.35); }
.btn.primary:hover { box-shadow: 0 16px 40px rgba(74,85,240,.45); }
.btn.small { min-height: 40px; padding: 0 16px; font-size: .875rem; }
.btn.ghost { background: transparent; box-shadow: none; }
.chip { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 16px; border-radius: var(--r-pill); border: 1px solid var(--line); background: var(--surface); font-weight: 650; font-size: .9rem; cursor: pointer; transition: all .2s var(--ease); box-shadow: var(--shadow-1); }
.chip:hover { border-color: color-mix(in oklab, var(--brand) 40%, var(--line)); transform: translateY(-1px); }
.chip[aria-pressed="true"] { background: var(--brand-soft); border-color: var(--brand); color: var(--brand-ink); }
.chip[aria-pressed="true"] .ic { color: var(--brand); }

/* glossary terms */
.term { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: help; text-decoration: underline dotted color-mix(in oklab, var(--brand) 60%, transparent); text-decoration-thickness: 2px; text-underline-offset: 4px; }
.term:hover { color: var(--brand-ink); }
.pop { position: absolute; z-index: 80; width: min(320px, calc(100vw - 24px)); background: var(--ink); color: var(--bg); padding: 14px 16px; border-radius: var(--r-md); box-shadow: var(--shadow-3); font-size: .9rem; line-height: 1.5; animation: popin .18s var(--ease); }
.pop b { display: block; font-size: .95rem; margin-bottom: 4px; }
.pop button { margin-top: 10px; background: color-mix(in oklab, var(--bg) 14%, transparent); color: var(--bg); border: 0; border-radius: var(--r-pill); padding: 6px 12px; font-weight: 700; font-size: .8rem; cursor: pointer; display: inline-flex; gap: 6px; align-items: center; }
.pop[hidden] { display: none; }
@keyframes popin { from { opacity: 0; transform: translateY(4px) scale(.98); } }

/* =========================================================
   Header + progress
   ========================================================= */
header.top { position: fixed; inset: 0 0 auto 0; height: var(--header); z-index: 50; display: flex; align-items: center; gap: 14px; padding: 0 20px; background: color-mix(in oklab, var(--bg) 82%, transparent); backdrop-filter: saturate(1.6) blur(16px); -webkit-backdrop-filter: saturate(1.6) blur(16px); border-bottom: 1px solid color-mix(in oklab, var(--line) 70%, transparent); transition: transform .35s var(--ease); }
header.top.away { transform: translateY(-100%); }
.brand { display: inline-flex; align-items: center; gap: 9px; font-weight: 800; letter-spacing: -0.02em; text-decoration: none; color: var(--ink); white-space: nowrap; }
.brand .orb { width: 30px; height: 30px; border-radius: 10px; background: var(--grad-wide); display: grid; place-items: center; color: #fff; box-shadow: 0 6px 16px rgba(74,85,240,.35); }
.brand .orb .ic { width: 18px; height: 18px; }
.chapter-pill { font-size: .82rem; font-weight: 700; color: var(--ink-2); background: var(--bg-2); border-radius: var(--r-pill); padding: 6px 12px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 40vw; }
.spacer { flex: 1; }
.icon-btn { width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--line); background: var(--surface); display: grid; place-items: center; cursor: pointer; box-shadow: var(--shadow-1); }
.progress { position: absolute; left: 0; bottom: -1px; height: 3px; width: 0; background: var(--grad-wide); border-radius: 0 3px 3px 0; }
.rail { position: fixed; right: 22px; top: 50%; transform: translateY(-50%); z-index: 40; display: flex; flex-direction: column; gap: 14px; }
.rail a { position: relative; width: 12px; height: 12px; border-radius: 50%; background: var(--bg-3); border: 2px solid var(--surface); box-shadow: 0 0 0 1px var(--line); display: block; transition: transform .2s, background .2s; }
.rail a.done { background: color-mix(in oklab, var(--brand) 45%, var(--bg-3)); }
.rail a.on { background: var(--brand); transform: scale(1.35); }
.rail a span { position: absolute; right: 22px; top: 50%; transform: translateY(-50%); white-space: nowrap; font-size: .78rem; font-weight: 700; background: var(--ink); color: var(--bg); padding: 4px 10px; border-radius: var(--r-pill); opacity: 0; pointer-events: none; transition: opacity .15s; }
.rail a:hover span, .rail a:focus-visible span { opacity: 1; }
@media (max-width: 1100px) { .rail { display: none; } }
@media (max-width: 640px) { .brand .name { display: none; } .chapter-pill { max-width: 46vw; } }

/* =========================================================
   Hero
   ========================================================= */
.hero { position: relative; min-height: 100svh; display: grid; align-items: center; padding: calc(var(--header) + 24px) 0 48px; overflow: hidden; isolation: isolate; }
.blob { position: absolute; border-radius: 50%; filter: blur(60px); opacity: .55; z-index: -1; animation: drift 18s ease-in-out infinite alternate; }
.blob.b1 { width: 520px; height: 520px; background: #c9ccff; top: -120px; left: -140px; }
.blob.b2 { width: 460px; height: 460px; background: #b9f0ea; bottom: -160px; right: -100px; animation-delay: -6s; }
.blob.b3 { width: 340px; height: 340px; background: #ffd9c4; top: 30%; right: 30%; opacity: .35; animation-delay: -12s; }
:root[data-theme="dark"] .blob { opacity: .22; }
@keyframes drift { to { transform: translate(40px, 30px) scale(1.08); } }
.hero-grid { display: grid; grid-template-columns: 1fr 1.05fr; gap: 40px; align-items: center; }
@media (max-width: 920px) { .hero-grid { grid-template-columns: 1fr; gap: 24px; } }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: .8rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: var(--brand-ink); background: var(--brand-soft); padding: 7px 12px; border-radius: var(--r-pill); }
.hero h1 { font-size: clamp(2.6rem, 6vw, 4.6rem); margin: 18px 0 18px; }
.hero h1 .g { background: var(--grad-wide); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .lede { font-size: clamp(1.05rem, 1.6vw, 1.22rem); color: var(--ink-2); max-width: 520px; margin-bottom: 28px; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.hero-meta { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 26px; color: var(--ink-3); font-size: .875rem; font-weight: 600; }
.hero-meta span { display: inline-flex; gap: 7px; align-items: center; }
@media (max-width: 560px) { .cta-row .btn { flex: 1 1 100%; } }

/* chaos -> order visual */
.organize { position: relative; aspect-ratio: 1.25 / 1; width: 100%; max-width: 620px; justify-self: center; border-radius: var(--r-lg); background: color-mix(in oklab, var(--surface) 70%, transparent); border: 1px solid var(--line); box-shadow: var(--shadow-2); backdrop-filter: blur(6px); overflow: hidden; }
.organize svg.edges { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.organize .edge { fill: none; stroke: color-mix(in oklab, var(--brand) 55%, transparent); stroke-width: 1.6; vector-effect: non-scaling-stroke; stroke-dasharray: 1; stroke-dashoffset: 1; transition: stroke-dashoffset 1s var(--ease), stroke .2s, opacity .2s; }
.organize.ordered .edge { stroke-dashoffset: 0; transition-delay: calc(.55s + var(--d, 0s)); }
.organize .edge.hot { stroke: var(--brand); stroke-width: 2.6; }
.organize.has-hot .edge:not(.hot) { opacity: .2; }
.note { position: absolute; left: 0; top: 0; transform: translate(-50%, -50%) translate(var(--x), var(--y)) rotate(var(--r)); display: inline-flex; align-items: center; gap: 7px; padding: 7px 11px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-1); font-size: .8rem; font-weight: 700; white-space: nowrap; transition: transform 1.1s var(--ease), box-shadow .2s, border-color .2s, opacity .2s; transition-delay: var(--d, 0s); cursor: default; }
.note .ic { width: 15px; height: 15px; }
.note.work .ic { color: var(--human-ink); } .note.learn .ic { color: var(--brand); } .note.life .ic { color: var(--ai-ink); }
.organize.ordered .note { transform: translate(-50%, -50%) translate(var(--ox), var(--oy)) rotate(0deg); }
.organize.ordered .note:hover, .note.hot { border-color: var(--brand); box-shadow: 0 0 0 3px color-mix(in oklab, var(--brand) 18%, transparent), var(--shadow-2); }
.organize.has-hot .note:not(.hot) { opacity: .45; }
.note .s { display: none; }
@media (max-width: 560px) { .note .f { display: none; } .note .s { display: inline; } .note { font-size: .74rem; padding: 6px 9px; } }
@media (max-width: 560px) { .org-caption { display: none; } .org-bar { justify-content: center; } .cluster { font-size: .62rem; } }
.cluster { position: absolute; transform: translate(-50%, -50%); font-size: .72rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; opacity: 0; transition: opacity .6s 1.2s; padding: 3px 9px; border-radius: var(--r-pill); }
.organize.ordered .cluster { opacity: 1; }
.cluster.work { color: var(--human-ink); background: var(--human-soft); } .cluster.learn { color: var(--brand-ink); background: var(--brand-soft); } .cluster.life { color: var(--ai-ink); background: var(--ai-soft); }
.sweep { position: absolute; inset: 0; background: linear-gradient(100deg, transparent 30%, color-mix(in oklab, var(--ai) 22%, transparent) 50%, transparent 70%); transform: translateX(-100%); pointer-events: none; }
.organize.ordered .sweep { animation: sweep 1.4s var(--ease) .1s 1 both; }
@keyframes sweep { to { transform: translateX(100%); } }
.org-bar { position: absolute; left: 12px; right: 12px; bottom: 12px; display: flex; align-items: center; gap: 10px; justify-content: space-between; }
.org-caption { font-size: .85rem; font-weight: 700; color: var(--ink-2); background: color-mix(in oklab, var(--surface) 88%, transparent); padding: 6px 12px; border-radius: var(--r-pill); border: 1px solid var(--line); display: inline-flex; gap: 8px; align-items: center; }
.org-caption .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--human); }
.organize.ordered .org-caption .dot { background: var(--ai); }
.seg { display: inline-flex; padding: 4px; gap: 4px; background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--r-pill); }
.seg button { border: 0; background: transparent; border-radius: var(--r-pill); padding: 0 14px; min-height: 36px; font-weight: 700; font-size: .82rem; color: var(--ink-2); cursor: pointer; display: inline-flex; gap: 6px; align-items: center; }
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--brand-ink); box-shadow: var(--shadow-1); }

/* =========================================================
   Chapters
   ========================================================= */
.chapter { position: relative; padding: 110px 0 90px; }
.chapter:nth-of-type(even) { background: linear-gradient(180deg, var(--bg-2), var(--bg) 70%); }
.ch-head { display: grid; gap: 14px; margin-bottom: 34px; }
.ch-num { display: inline-flex; align-items: center; gap: 10px; font-size: .82rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: var(--brand-ink); }
.ch-num .n { font-size: 1rem; width: 34px; height: 34px; border-radius: 11px; display: grid; place-items: center; background: var(--grad); color: #fff; letter-spacing: 0; box-shadow: 0 6px 16px rgba(74,85,240,.3); }
.ch-head h2 { font-size: clamp(2rem, 4.4vw, 3.2rem); max-width: 18ch; }
.ch-head .sub { font-size: 1.15rem; color: var(--ink-2); max-width: 60ch; margin: 0; }
.prose { font-size: 1.08rem; color: var(--ink); max-width: 66ch; }
.prose p { margin-bottom: 1.1em; }
.big-quote { font-size: clamp(1.4rem, 2.8vw, 2rem); font-weight: 750; letter-spacing: -0.02em; line-height: 1.3; margin: 10px 0 34px; padding-left: 22px; border-left: 4px solid; border-image: var(--grad-wide) 1; max-width: 32ch; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); box-shadow: var(--shadow-2); padding: clamp(18px, 3vw, 30px); margin: 26px 0; position: relative; }
.panel-head { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.panel-head .badge { width: 38px; height: 38px; border-radius: 12px; display: grid; place-items: center; background: var(--brand-soft); color: var(--brand); flex: none; }
.panel-head h3 { font-size: 1.15rem; letter-spacing: -0.015em; }
.panel-head .try { margin-left: auto; font-size: .72rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: var(--ai-ink); background: var(--ai-soft); padding: 4px 10px; border-radius: var(--r-pill); display: inline-flex; gap: 6px; align-items: center; }
.callout { display: flex; gap: 14px; align-items: flex-start; padding: 16px 18px; border-radius: var(--r-md); background: var(--brand-soft); color: var(--ink); font-weight: 600; margin: 22px 0; }
.callout .ic { color: var(--brand); width: 22px; height: 22px; margin-top: 2px; }
.callout.ai { background: var(--ai-soft); } .callout.ai .ic { color: var(--ai-ink); }
.next-ch { display: flex; justify-content: flex-end; margin-top: 30px; }
.next-ch .btn { white-space: normal; text-align: left; min-height: 56px; border-radius: 18px; }
.next-ch .btn small { display: block; font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; opacity: .85; }

/* reveal */
.rv { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.rv.in { opacity: 1; transform: none; }

/* ch1: places */
.places { display: flex; flex-wrap: wrap; gap: 10px; }
.places-out { margin-top: 18px; font-size: 1.05rem; min-height: 3.4em; }
.places-out b { color: var(--human-ink); }
.places-out .ok { color: var(--ai-ink); font-weight: 700; }
/* ch1: two chats */
.week { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 760px) { .week { grid-template-columns: 1fr; } }
.day { background: var(--bg-2); border-radius: var(--r-md); padding: 14px; border: 1px solid var(--line); }
.day h4 { font-size: .78rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
.bubble { max-width: 92%; padding: 10px 14px; border-radius: 16px; margin: 6px 0; font-size: .95rem; line-height: 1.45; }
.bubble.me { margin-left: auto; background: var(--grad); color: #fff; border-bottom-right-radius: 6px; }
.bubble.bot { background: var(--surface); border: 1px solid var(--line); border-bottom-left-radius: 6px; }
.bubble.bot.long { color: var(--ink-2); }
.remembered { display: inline-flex; gap: 6px; align-items: center; margin-top: 6px; font-size: .75rem; font-weight: 800; color: var(--ai-ink); background: var(--ai-soft); padding: 3px 9px; border-radius: var(--r-pill); }
.fade-swap { animation: swap .45s var(--ease); }
@keyframes swap { from { opacity: 0; transform: translateY(6px); } }

/* ch2: three steps + ask graph */
.steps3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 10px 0 8px; }
@media (max-width: 760px) { .steps3 { grid-template-columns: 1fr; } }
.step3 { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md); padding: 18px; box-shadow: var(--shadow-1); }
.step3 .ico { width: 44px; height: 44px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 12px; color: #fff; }
.step3:nth-child(1) .ico { background: linear-gradient(135deg, #f2763b, #f0a35b); }
.step3:nth-child(2) .ico { background: var(--grad); }
.step3:nth-child(3) .ico { background: linear-gradient(135deg, #12b5a6, #3cc9e0); }
.step3 b { display: block; font-size: 1.05rem; margin-bottom: 4px; }
.step3 span { color: var(--ink-2); font-size: .95rem; }
.askg { display: grid; grid-template-columns: 1.1fr 1fr; gap: 18px; align-items: stretch; }
@media (max-width: 820px) { .askg { grid-template-columns: 1fr; } }
.askg > svg { width: 100%; height: auto; display: block; background: var(--bg-2); border-radius: var(--r-md); border: 1px solid var(--line); align-self: start; }
.askg .ln { stroke: var(--line); stroke-width: 2; transition: stroke .3s, stroke-width .3s; }
.askg .ln.on { stroke: var(--brand); stroke-width: 3; }
.askg .nd rect { fill: var(--surface); stroke: var(--line); stroke-width: 1.5; transition: all .3s; }
.askg .nd text { font: 700 12px var(--font); fill: var(--ink); }
.askg .nd.on rect { stroke: var(--brand); stroke-width: 2.5; fill: var(--brand-soft); }
.askg .nd.dim { opacity: .35; }
.answer-box { background: var(--bg-2); border-radius: var(--r-md); border: 1px solid var(--line); padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.answer-box .q { display: flex; flex-wrap: wrap; gap: 8px; }
.answer-box .a { background: var(--surface); border-radius: 14px; padding: 14px; border: 1px solid var(--line); font-size: .98rem; min-height: 130px; }
.answer-box .a .src { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.answer-box .a .src span { font-size: .75rem; font-weight: 700; color: var(--brand-ink); background: var(--brand-soft); padding: 3px 9px; border-radius: var(--r-pill); }

/* ch3: before/after */
.ba { position: relative; border-radius: var(--r-lg); overflow: hidden; border: 1px solid var(--line); box-shadow: var(--shadow-2); background: var(--surface); user-select: none; }
.ba-side { padding: clamp(18px, 3vw, 30px); min-height: 340px; }
.ba-side.before { background: var(--human-soft); }
.ba-side.after { position: absolute; inset: 0; background: var(--ai-soft); clip-path: inset(0 0 0 var(--cut, 50%)); }
.ba-side .who { display: inline-flex; align-items: center; gap: 8px; font-weight: 800; font-size: .8rem; letter-spacing: .1em; text-transform: uppercase; padding: 5px 11px; border-radius: var(--r-pill); background: var(--surface); }
.ba-side.before .who { color: var(--human-ink); } .ba-side.after .who { color: var(--ai-ink); }
.ba-side h3 { font-size: clamp(1.3rem, 2.4vw, 1.7rem); margin: 14px 0 12px; }
.ba-side ul { list-style: none; padding: 0; margin: 0 0 14px; display: grid; gap: 8px; }
.ba-side li { display: flex; gap: 10px; align-items: center; font-weight: 600; }
.ba-side li .ic { width: 20px; height: 20px; }
.ba-side.before li .ic { color: var(--human-ink); } .ba-side.after li .ic { color: var(--ai-ink); }
.ba-side .out { font-size: .95rem; color: var(--ink-2); font-weight: 600; }
.ba-side .inner { max-width: 46%; }
.ba-side.after .inner { margin-left: auto; }
@media (max-width: 700px) { .ba-side .inner { max-width: 100%; } .ba-side.after .inner { margin-left: 0; } }
.ba-handle { position: absolute; top: 0; bottom: 0; left: var(--cut, 50%); width: 0; z-index: 3; }
.ba-handle::before { content: ""; position: absolute; top: 0; bottom: 0; left: -1.5px; width: 3px; background: var(--surface); box-shadow: 0 0 0 1px var(--line); }
.ba-handle span { position: absolute; top: 50%; left: 0; transform: translate(-50%, -50%); width: 46px; height: 46px; border-radius: 50%; background: var(--surface); box-shadow: var(--shadow-2); display: grid; place-items: center; color: var(--ink-2); }
.ba input[type=range] { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; cursor: ew-resize; z-index: 4; margin: 0; }
.ba-hint { text-align: center; color: var(--ink-3); font-size: .85rem; font-weight: 600; margin-top: 10px; }
.people { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 26px; }
@media (max-width: 760px) { .people { grid-template-columns: 1fr; } }
.person { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 22px; box-shadow: var(--shadow-1); display: grid; gap: 10px; }
.person .top { display: flex; gap: 12px; align-items: center; }
.person .av { width: 48px; height: 48px; border-radius: 16px; display: grid; place-items: center; font-weight: 800; color: #fff; font-size: 1.05rem; }
.person b { font-size: 1.1rem; } .person small { display: block; color: var(--ink-3); font-weight: 600; font-size: .85rem; }
.person blockquote { margin: 0; padding: 10px 14px; border-left: 3px solid var(--brand); background: var(--bg-2); border-radius: 0 12px 12px 0; font-weight: 600; color: var(--ink-2); font-size: .95rem; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 18px; }
@media (max-width: 760px) { .stats { grid-template-columns: 1fr; } }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md); padding: 16px 18px; box-shadow: var(--shadow-1); }
.stat .n { font-size: 2rem; font-weight: 800; letter-spacing: -0.03em; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; font-variant-numeric: tabular-nums; }
.stat .l { color: var(--ink-2); font-size: .92rem; font-weight: 600; }

/* ch4: tool cards + quiz */
.kinds { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
@media (max-width: 980px) { .kinds { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .kinds { grid-template-columns: 1fr; } }
.kind { position: relative; min-height: 290px; perspective: 1200px; border: 0; padding: 0; background: none; text-align: left; cursor: pointer; }
.kind .face { position: absolute; inset: 0; border-radius: var(--r-lg); padding: 20px; background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow-1); backface-visibility: hidden; -webkit-backface-visibility: hidden; transition: transform .6s var(--ease); display: flex; flex-direction: column; gap: 10px; }
.kind .back { transform: rotateY(180deg); background: var(--bg-2); }
.kind.flip .front { transform: rotateY(-180deg); }
.kind.flip .back { transform: rotateY(0); }
.kind:hover .front { box-shadow: var(--shadow-2); border-color: color-mix(in oklab, var(--brand) 35%, var(--line)); }
.kind .k-ico { width: 52px; height: 52px; border-radius: 16px; display: grid; place-items: center; color: #fff; }
.kind .k-ico .ic { width: 26px; height: 26px; }
.kind h3 { font-size: 1.2rem; letter-spacing: -0.02em; }
.kind .like { color: var(--ink-2); font-size: .92rem; font-weight: 600; }
.kind .eg { margin-top: auto; display: flex; gap: 6px; flex-wrap: wrap; }
.kind .eg span { font-size: .75rem; font-weight: 800; padding: 4px 9px; border-radius: var(--r-pill); background: var(--bg-2); color: var(--ink-2); }
.kind .flipme { font-size: .78rem; font-weight: 800; color: var(--brand-ink); display: inline-flex; gap: 6px; align-items: center; }
.kind .back dl { margin: 0; display: grid; gap: 10px; font-size: .9rem; }
.kind .back dt { font-weight: 800; font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
.kind .back dd { margin: 2px 0 0; color: var(--ink); font-weight: 600; }
.quiz { overflow: hidden; }
.quiz-progress { display: flex; gap: 6px; margin-bottom: 18px; }
.quiz-progress i { height: 6px; flex: 1; border-radius: 3px; background: var(--bg-3); transition: background .3s; }
.quiz-progress i.on { background: var(--grad); }
.qstep h4 { font-size: 1.35rem; margin-bottom: 14px; letter-spacing: -0.02em; }
.opts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
@media (max-width: 700px) { .opts { grid-template-columns: 1fr; } }
.opt { border: 1px solid var(--line); background: var(--surface); border-radius: var(--r-md); padding: 16px; text-align: left; cursor: pointer; display: grid; gap: 8px; box-shadow: var(--shadow-1); transition: all .2s var(--ease); min-height: 112px; }
.opt:hover { border-color: var(--brand); transform: translateY(-2px); box-shadow: var(--shadow-2); }
.opt .ic { width: 28px; height: 28px; color: var(--brand); }
.opt b { font-size: 1rem; } .opt span { font-size: .88rem; color: var(--ink-2); font-weight: 600; }
.slide-in { animation: slidein .45s var(--ease); }
@keyframes slidein { from { opacity: 0; transform: translateX(24px); } }
.result { display: grid; grid-template-columns: auto 1fr; gap: 18px; align-items: start; }
@media (max-width: 600px) { .result { grid-template-columns: 1fr; } }
.result .medal { width: 72px; height: 72px; border-radius: 22px; background: var(--grad-wide); display: grid; place-items: center; color: #fff; box-shadow: 0 14px 30px rgba(74,85,240,.35); animation: pop .6s var(--ease); }
.result .medal .ic { width: 34px; height: 34px; }
@keyframes pop { 0% { transform: scale(.4) rotate(-12deg); opacity: 0; } 70% { transform: scale(1.08) rotate(3deg); } 100% { transform: none; opacity: 1; } }
.result small { font-weight: 800; letter-spacing: .1em; text-transform: uppercase; font-size: .72rem; color: var(--ai-ink); }
.result h4 { font-size: 1.5rem; margin: 4px 0 8px; letter-spacing: -0.02em; }
.result p { color: var(--ink-2); margin-bottom: 12px; }
.result .first { display: flex; gap: 10px; align-items: flex-start; background: var(--ai-soft); padding: 12px 14px; border-radius: 14px; font-weight: 650; margin-bottom: 14px; }
.result .first .ic { color: var(--ai-ink); margin-top: 3px; }

/* ch5: steps */
.timeline { display: grid; gap: 12px; position: relative; }
.tstep { display: grid; grid-template-columns: auto 1fr auto; gap: 16px; align-items: start; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md); padding: 16px 18px; box-shadow: var(--shadow-1); transition: border-color .3s, background .3s; }
.tstep.done { border-color: color-mix(in oklab, var(--ok) 45%, var(--line)); background: color-mix(in oklab, var(--ok-soft) 50%, var(--surface)); }
.tstep .when { font-size: .72rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: var(--brand-ink); }
.tstep b { display: block; font-size: 1.08rem; margin: 2px 0 4px; }
.tstep p { margin: 0; color: var(--ink-2); font-size: .97rem; }
.tstep .num { width: 40px; height: 40px; border-radius: 13px; display: grid; place-items: center; background: var(--brand-soft); color: var(--brand); font-weight: 800; }
.tstep.done .num { background: var(--ok); color: #fff; }
.check { width: 44px; height: 44px; border-radius: 50%; border: 2px solid var(--line); background: var(--surface); display: grid; place-items: center; cursor: pointer; color: transparent; transition: all .25s var(--ease); }
.check:hover { border-color: var(--ok); }
.tstep.done .check { background: var(--ok); border-color: var(--ok); color: #fff; transform: scale(1.05); }
.progress-row { display: flex; align-items: center; gap: 14px; margin: 6px 0 18px; font-weight: 700; color: var(--ink-2); }
.bar { flex: 1; height: 10px; border-radius: 6px; background: var(--bg-3); overflow: hidden; }
.bar i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--ok), #52c77a); border-radius: 6px; transition: width .5s var(--ease); }
.template { background: #0f1222; color: #e6e9ff; border-radius: var(--r-md); padding: 18px 20px; font-family: var(--mono); font-size: .86rem; line-height: 1.6; white-space: pre-wrap; overflow: auto; margin: 0; }
.template .c { color: #8e96c8; }
.template-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 10px; flex-wrap: wrap; }

/* ch6: safety */
.safety { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: center; }
@media (max-width: 820px) { .safety { grid-template-columns: 1fr; } }
.venn { width: 100%; max-width: 360px; justify-self: center; }
.venn circle { transition: fill-opacity .35s, stroke .35s; }
.venn .core { transition: opacity .35s; }
.venn text { font: 800 12px var(--font); fill: var(--ink-2); }
.switches { display: grid; gap: 12px; }
.switch { display: grid; grid-template-columns: auto 1fr auto; gap: 14px; align-items: center; padding: 14px 16px; border-radius: var(--r-md); border: 1px solid var(--line); background: var(--surface); cursor: pointer; text-align: left; box-shadow: var(--shadow-1); transition: border-color .2s; min-height: 72px; }
.switch:hover { border-color: color-mix(in oklab, var(--brand) 35%, var(--line)); }
.switch .ico { width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; background: var(--bg-2); color: var(--ink-2); }
.switch b { display: block; font-size: 1rem; } .switch span { color: var(--ink-2); font-size: .88rem; font-weight: 600; }
.toggle { width: 48px; height: 28px; border-radius: 14px; background: var(--bg-3); position: relative; transition: background .25s; flex: none; }
.toggle::after { content: ""; position: absolute; top: 3px; left: 3px; width: 22px; height: 22px; border-radius: 50%; background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,.25); transition: transform .25s var(--ease); }
.switch[aria-checked="true"] .toggle { background: var(--brand-fill); }
.switch[aria-checked="true"] .toggle::after { transform: translateX(20px); }
.switch[aria-checked="true"] .ico { background: var(--brand-soft); color: var(--brand); }
.verdict { margin-top: 18px; padding: 16px 18px; border-radius: var(--r-md); font-weight: 650; display: flex; gap: 12px; align-items: flex-start; transition: background .3s, color .3s; }
.verdict .ic { width: 22px; height: 22px; margin-top: 2px; }
.verdict.safe { background: var(--ok-soft); } .verdict.safe .ic { color: var(--ok); }
.verdict.warn { background: var(--human-soft); } .verdict.warn .ic { color: var(--human-ink); }
.verdict.danger { background: var(--danger-soft); animation: shake .5s; } .verdict.danger .ic { color: var(--danger); }
@keyframes shake { 20%, 60% { transform: translateX(-4px); } 40%, 80% { transform: translateX(4px); } }

/* finale */
.finale { padding: 110px 0 60px; }
.plan { background: var(--surface); border-radius: var(--r-lg); border: 1px solid var(--line); box-shadow: var(--shadow-3); overflow: hidden; }
.plan-top { background: var(--grad-wide); color: #fff; padding: 28px clamp(20px, 4vw, 36px); }
.plan-top h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
.plan-top p { margin: 8px 0 0; opacity: .92; font-weight: 600; }
.plan-body { padding: clamp(20px, 4vw, 36px); display: grid; gap: 14px; }
.plan-item { display: grid; grid-template-columns: auto 1fr auto; gap: 14px; align-items: center; padding: 14px 16px; border-radius: var(--r-md); background: var(--bg-2); }
.plan-item .ico { width: 42px; height: 42px; border-radius: 13px; background: var(--surface); display: grid; place-items: center; color: var(--brand); box-shadow: var(--shadow-1); }
.plan-item b { display: block; } .plan-item span { color: var(--ink-2); font-size: .92rem; font-weight: 600; }
.plan-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 6px; }
.library { margin-top: 60px; }
.library h3 { font-size: 1.5rem; margin-bottom: 6px; }
.library > p { color: var(--ink-2); }
details.lib { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md); margin: 10px 0; box-shadow: var(--shadow-1); }
details.lib summary { list-style: none; cursor: pointer; padding: 16px 18px; font-weight: 750; display: flex; align-items: center; gap: 12px; min-height: 56px; }
details.lib summary::-webkit-details-marker { display: none; }
details.lib summary .ic.lead { color: var(--brand); }
details.lib summary .chev { margin-left: auto; transition: transform .25s; color: var(--ink-3); }
details.lib[open] summary .chev { transform: rotate(180deg); }
details.lib .body { padding: 0 18px 18px; color: var(--ink-2); font-size: .97rem; }
details.lib .body li { margin: 4px 0; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .88rem; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); background: var(--bg-2); }
td .sw { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 7px; }
footer { padding: 40px 0 120px; color: var(--ink-3); font-size: .88rem; text-align: center; }

/* toast */
.toast { position: fixed; left: 50%; bottom: 96px; transform: translateX(-50%); width: max-content; max-width: min(560px, calc(100vw - 32px)); z-index: 70; background: var(--ink); color: var(--bg); border-radius: var(--r-md); padding: 12px 14px 12px 18px; display: flex; gap: 12px; align-items: center; box-shadow: var(--shadow-3); font-weight: 650; font-size: .92rem; max-width: calc(100vw - 32px); animation: popin .25s var(--ease); }
.toast[hidden] { display: none; }
.toast > span { flex: 1; }
.toast button { border: 0; border-radius: var(--r-pill); padding: 8px 14px; font-weight: 800; cursor: pointer; background: var(--bg); color: var(--ink); white-space: nowrap; }
.toast .x { background: transparent; color: var(--bg); padding: 6px; }

/* =========================================================
   Guide (chat)
   ========================================================= */
.fab { position: fixed; right: 22px; bottom: 22px; z-index: 60; display: inline-flex; align-items: center; gap: 10px; min-height: 56px; padding: 0 20px 0 8px; border-radius: var(--r-pill); border: 0; background: var(--ink); color: var(--bg); font-weight: 800; cursor: pointer; box-shadow: 0 14px 40px rgba(16,19,38,.3); transition: transform .2s var(--ease), opacity .3s; }
.fab:hover { transform: translateY(-2px); }
.fab .orb { width: 42px; height: 42px; border-radius: 50%; background: var(--grad-wide); display: grid; place-items: center; color: #fff; position: relative; }
.fab .orb::after { content: ""; position: absolute; inset: -3px; border-radius: 50%; border: 2px solid color-mix(in oklab, var(--ai) 60%, transparent); animation: ring 2.4s ease-out infinite; }
@keyframes ring { from { transform: scale(.9); opacity: 1; } to { transform: scale(1.35); opacity: 0; } }
.fab.hide { opacity: 0; pointer-events: none; transform: translateY(20px); }
@media (max-width: 560px) { .fab .lbl { display: none; } .fab { padding: 0 7px; } }

.guide-back { position: fixed; inset: 0; z-index: 90; background: rgba(12,14,26,.35); backdrop-filter: blur(2px); opacity: 0; pointer-events: none; transition: opacity .3s; }
.guide-back.open { opacity: 1; pointer-events: auto; }
.guide { position: fixed; z-index: 91; top: 12px; right: 12px; bottom: 12px; width: min(460px, calc(100vw - 24px)); background: var(--surface); border: 1px solid var(--line); border-radius: 26px; box-shadow: var(--shadow-3); display: flex; flex-direction: column; transform: translateX(calc(100% + 40px)); transition: transform .45s var(--ease); overflow: hidden; }
.guide.open { transform: none; }
@media (max-width: 560px) { .guide { top: 0; right: 0; bottom: 0; width: 100vw; border-radius: 0; } }
.g-head { display: flex; align-items: center; gap: 12px; padding: 16px 16px 12px; border-bottom: 1px solid var(--line); }
.g-head .orb { width: 42px; height: 42px; border-radius: 50%; background: var(--grad-wide); display: grid; place-items: center; color: #fff; flex: none; }
.g-head b { display: block; font-size: 1.02rem; }
.g-head small { color: var(--ink-3); font-weight: 650; font-size: .8rem; display: inline-flex; gap: 6px; align-items: center; }
.g-head small i { width: 7px; height: 7px; border-radius: 50%; background: var(--ok); display: inline-block; }
.g-mode { padding: 10px 16px; border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.g-mode .seg button { min-height: 34px; }
.g-mode .hint { font-size: .78rem; color: var(--ink-3); font-weight: 600; }
.g-log { flex: 1; overflow-y: auto; padding: 18px 16px 8px; display: flex; flex-direction: column; gap: 14px; scroll-behavior: smooth; }
.msg { display: flex; gap: 10px; align-items: flex-start; animation: msgin .35s var(--ease); }
@keyframes msgin { from { opacity: 0; transform: translateY(8px); } }
.msg.me { justify-content: flex-end; }
.msg.me .b { background: var(--grad); color: #fff; border-radius: 18px 18px 6px 18px; padding: 10px 14px; max-width: 82%; font-weight: 600; font-size: .95rem; }
.msg .av { width: 30px; height: 30px; border-radius: 50%; background: var(--grad-wide); color: #fff; display: grid; place-items: center; flex: none; }
.msg .av .ic { width: 16px; height: 16px; }
.msg.bot .stack { max-width: 88%; display: grid; gap: 8px; }
.msg.bot .b { background: var(--bg-2); border-radius: 18px 18px 18px 6px; padding: 12px 14px; font-size: .97rem; line-height: 1.55; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow-1); overflow: hidden; }
.card-h { display: flex; gap: 10px; align-items: center; padding: 12px 14px 0; }
.card-h .ico { width: 30px; height: 30px; border-radius: 10px; background: var(--brand-soft); color: var(--brand); display: grid; place-items: center; flex: none; }
.card-h .ico .ic { width: 16px; height: 16px; }
.card-h b { font-size: .95rem; letter-spacing: -0.01em; }
.card-b { padding: 10px 14px 14px; }
.card-b .short { font-size: .97rem; margin: 0 0 10px; }
.card-b ul { list-style: none; margin: 0 0 10px; padding: 0; display: grid; gap: 7px; }
.card-b li { display: flex; gap: 9px; align-items: flex-start; font-size: .92rem; font-weight: 600; color: var(--ink); line-height: 1.45; }
.card-b li .ic { color: var(--ai-ink); width: 18px; height: 18px; margin-top: 1px; }
.card-b .ana { display: flex; gap: 9px; background: var(--human-soft); border-radius: 12px; padding: 9px 11px; font-size: .88rem; font-weight: 650; color: var(--ink); margin-bottom: 10px; }
.card-b .ana .ic { color: var(--human-ink); width: 18px; height: 18px; margin-top: 1px; }
.card-f { display: flex; gap: 8px; flex-wrap: wrap; padding: 0 14px 14px; }
.card-f .go { display: inline-flex; gap: 6px; align-items: center; font-size: .82rem; font-weight: 800; color: #fff; background: var(--grad); border: 0; border-radius: var(--r-pill); padding: 8px 13px; cursor: pointer; }
.followups { display: flex; gap: 6px; flex-wrap: wrap; }
.fu { font-size: .84rem; font-weight: 700; color: var(--brand-ink); background: var(--surface); border: 1px solid color-mix(in oklab, var(--brand) 30%, var(--line)); border-radius: var(--r-pill); padding: 7px 12px; cursor: pointer; transition: background .15s, transform .15s; min-height: 36px; }
.fu:hover { background: var(--brand-soft); transform: translateY(-1px); }
.card-f .alt { display: inline-flex; gap: 6px; align-items: center; font-size: .82rem; font-weight: 800; color: var(--brand-ink); background: var(--brand-soft); border: 0; border-radius: var(--r-pill); padding: 8px 13px; cursor: pointer; }
.card-f .alt:disabled { opacity: .55; cursor: default; }
.explain { background: var(--ai-soft); border-radius: 16px; padding: 12px 14px; display: grid; gap: 6px; animation: msgin .35s var(--ease); }
.explain .ex-t { font-size: .95rem; line-height: 1.55; }
.typing { display: inline-flex; gap: 5px; padding: 4px 2px; }
.typing i { width: 7px; height: 7px; border-radius: 50%; background: var(--ink-3); animation: bounce 1.2s infinite; }
.typing i:nth-child(2) { animation-delay: .15s; } .typing i:nth-child(3) { animation-delay: .3s; }
@keyframes bounce { 30% { transform: translateY(-5px); opacity: 1; } 60%, 100% { transform: none; opacity: .4; } }
.ai-tag { display: inline-flex; gap: 6px; align-items: center; font-size: .72rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: var(--ai-ink); }
.g-form { display: flex; gap: 8px; padding: 12px; border-top: 1px solid var(--line); background: var(--surface); }
.g-form input { flex: 1; min-width: 0; font: inherit; font-size: 1rem; padding: 0 16px; min-height: 50px; border-radius: var(--r-pill); border: 1px solid var(--line); background: var(--bg-2); color: var(--ink); outline: none; transition: border-color .2s, box-shadow .2s; }
.g-form input:focus { border-color: var(--brand); box-shadow: 0 0 0 4px color-mix(in oklab, var(--brand) 16%, transparent); background: var(--surface); }
.g-form button { width: 50px; height: 50px; border-radius: 50%; border: 0; background: var(--grad); color: #fff; display: grid; place-items: center; cursor: pointer; flex: none; box-shadow: 0 8px 20px rgba(74,85,240,.35); }
.g-form button:disabled { opacity: .5; cursor: default; }
.smart-card { border: 1px dashed color-mix(in oklab, var(--brand) 40%, var(--line)); background: var(--brand-soft); border-radius: 18px; padding: 14px; display: grid; gap: 10px; }
.smart-card b { display: flex; gap: 8px; align-items: center; }
.smart-card p { margin: 0; font-size: .9rem; color: var(--ink-2); }
.smart-card .row { display: flex; gap: 8px; flex-wrap: wrap; }
.meter { height: 8px; background: var(--bg-3); border-radius: 4px; overflow: hidden; }
.meter i { display: block; height: 100%; width: 0; background: var(--grad-wide); transition: width .3s; }
.smart-card .st { font-size: .82rem; color: var(--ink-2); font-weight: 650; min-height: 1.2em; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; transition-delay: 0s !important; }
  .rv { opacity: 1; transform: none; }
}
@media (max-width: 760px), (pointer: coarse) { .seg button { min-height: 44px; } .toast .x { min-width: 44px; min-height: 44px; } }
@media print { header.top, .rail, .fab, .guide, .guide-back, .toast { display: none !important; } .rv { opacity: 1; transform: none; } }

/* ===================== Monochrome theme ===================== */
/* =========================================================
   Monochrome + 3D variant
   ========================================================= */
:root {
  --bg: #f4f4f3; --bg-2: #ebebea; --bg-3: #dededd; --surface: #ffffff;
  --ink: #0b0b0b; --ink-2: #474747; --ink-3: #636363; --line: #dadad8;
  --brand: #0b0b0b; --brand-ink: #0b0b0b; --brand-soft: #ececeb; --brand-fill: #0b0b0b;
  --human: #6b6b6b; --human-ink: #2b2b2b; --human-soft: #efefee;
  --ai: #9a9a9a; --ai-ink: #2b2b2b; --ai-soft: #f1f1f0;
  --danger: #0b0b0b; --danger-soft: #e4e4e3; --ok: #0b0b0b; --ok-soft: #eeeeed;
  --grad: linear-gradient(140deg, #0b0b0b, #2e2e2e);
  --grad-wide: linear-gradient(140deg, #0b0b0b, #3d3d3d);
  --on-ink: #ffffff;
  --edge: #c9c9c7;
  --shadow-1: 0 1px 0 rgba(255,255,255,.9) inset, 0 1px 2px rgba(0,0,0,.06), 0 3px 10px rgba(0,0,0,.05);
  --shadow-2: 0 1px 0 rgba(255,255,255,.9) inset, 0 6px 14px rgba(0,0,0,.06), 0 24px 48px -12px rgba(0,0,0,.14);
  --shadow-3: 0 40px 90px -20px rgba(0,0,0,.35);
}
:root[data-theme="dark"] {
  --bg: #0a0a0a; --bg-2: #131313; --bg-3: #1e1e1e; --surface: #161616;
  --ink: #f2f2f1; --ink-2: #b6b6b4; --ink-3: #929290; --line: #2a2a29;
  --brand: #f2f2f1; --brand-ink: #f2f2f1; --brand-soft: #222221; --brand-fill: #f2f2f1;
  --human: #9a9a98; --human-ink: #d6d6d4; --human-soft: #1d1d1c;
  --ai: #8a8a88; --ai-ink: #d6d6d4; --ai-soft: #1b1b1a;
  --danger: #f2f2f1; --danger-soft: #262625; --ok: #f2f2f1; --ok-soft: #1d1d1c;
  --grad: linear-gradient(140deg, #f2f2f1, #cfcfcd);
  --grad-wide: linear-gradient(140deg, #f2f2f1, #bdbdbb);
  --on-ink: #0b0b0b;
  --edge: #3a3a39;
  --shadow-1: 0 1px 0 rgba(255,255,255,.04) inset, 0 2px 8px rgba(0,0,0,.5);
  --shadow-2: 0 1px 0 rgba(255,255,255,.05) inset, 0 24px 48px -12px rgba(0,0,0,.7);
  --shadow-3: 0 40px 90px -20px rgba(0,0,0,.85);
}
/* everything that sat on a coloured gradient now sits on ink, with the opposite text colour */
.btn.primary, .msg.me .b, .card-f .go, .ch-num .n, .result .medal, .plan-top, .brand .orb, .fab .orb, .g-head .orb, .msg .av, .g-form button, .step3 .ico, .kind .k-ico, .person .av, .tstep.done .num, .tstep.done .check, .chip[aria-pressed="true"], .bubble.me, .seg button[aria-pressed="true"] { color: var(--on-ink) !important; }
.step3 .ico, .kind .k-ico, .person .av { background: var(--ink) !important; }
.step3:nth-child(2) .ico, .kind[data-i="1"] .k-ico { background: #3a3a3a !important; }
.step3:nth-child(3) .ico, .kind[data-i="2"] .k-ico { background: #6a6a6a !important; }
.kind[data-i="3"] .k-ico { background: #9a9a9a !important; }
:root[data-theme="dark"] .step3:nth-child(2) .ico, :root[data-theme="dark"] .kind[data-i="1"] .k-ico { background: #cfcfcd !important; }
:root[data-theme="dark"] .step3:nth-child(3) .ico, :root[data-theme="dark"] .kind[data-i="2"] .k-ico { background: #a9a9a7 !important; }
:root[data-theme="dark"] .kind[data-i="3"] .k-ico { background: #8a8a88 !important; }
.chip[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); }
.chip[aria-pressed="true"] .ic { color: var(--on-ink); }
.seg button[aria-pressed="true"] { background: var(--ink); box-shadow: 0 2px 0 #000, 0 4px 10px rgba(0,0,0,.2); }
:root[data-theme="dark"] .seg button[aria-pressed="true"] { box-shadow: 0 2px 0 #9a9a98; }
td .sw { background: var(--ink) !important; }
::selection { background: var(--ink); color: var(--bg); }
:focus-visible { outline-color: var(--ink); }

/* type */
.hero h1 { letter-spacing: -0.045em; }
.hero h1 .g { background: none; -webkit-text-fill-color: currentColor; color: var(--ink);
  text-shadow: 1px 1px 0 #d2d2d0, 2px 2px 0 #c8c8c6, 3px 3px 0 #bebebc, 4px 4px 0 #b4b4b2, 5px 5px 0 #aaaaa8, 6px 6px 0 #a0a09e, 10px 16px 28px rgba(0,0,0,.22); }
:root[data-theme="dark"] .hero h1 .g { text-shadow: 1px 1px 0 #3a3a39, 2px 2px 0 #333332, 3px 3px 0 #2c2c2b, 4px 4px 0 #262625, 5px 5px 0 #20201f, 6px 6px 0 #1a1a19, 10px 16px 28px rgba(0,0,0,.6); }
.stat .n { background: none; -webkit-text-fill-color: currentColor; color: var(--ink); text-shadow: 2px 2px 0 var(--edge); }
.eyebrow { background: var(--surface); color: var(--ink); border: 1px solid var(--line); box-shadow: var(--shadow-1); }
.big-quote { border-image: none; border-left-color: var(--ink); }
.ch-num { color: var(--ink-2); }
.ch-num .n { background: var(--ink); box-shadow: 3px 3px 0 var(--edge); border-radius: 9px; }

/* tactile buttons: they press down like keys */
.btn { box-shadow: 0 3px 0 var(--edge), 0 8px 18px -6px rgba(0,0,0,.12); transition: transform .12s var(--ease), box-shadow .12s var(--ease), background .2s; }
.btn:hover { transform: translateY(-1px); box-shadow: 0 4px 0 var(--edge), 0 12px 24px -8px rgba(0,0,0,.18); border-color: var(--ink-3); }
.btn:active { transform: translateY(3px); box-shadow: 0 0 0 var(--edge), 0 2px 6px rgba(0,0,0,.12); }
.btn.primary { background: var(--ink); box-shadow: 0 4px 0 #000, 0 14px 28px -10px rgba(0,0,0,.45); }
.btn.primary:hover { box-shadow: 0 5px 0 #000, 0 18px 32px -10px rgba(0,0,0,.5); }
.btn.primary:active { box-shadow: 0 0 0 #000, 0 4px 10px rgba(0,0,0,.3); }
:root[data-theme="dark"] .btn.primary { box-shadow: 0 4px 0 #8f8f8d, 0 14px 28px -10px rgba(0,0,0,.8); }
:root[data-theme="dark"] .btn.primary:active { box-shadow: 0 0 0 #8f8f8d; }
.chip { box-shadow: 0 2px 0 var(--edge); }
.chip:active { transform: translateY(2px); box-shadow: none; }
.icon-btn { box-shadow: 0 2px 0 var(--edge); }

/* hero: wireframe sphere + a tilted 3D board */
.blob { background: #d5d5d3 !important; opacity: .45; }
.blob.b3 { background: #e6e6e4 !important; }
:root[data-theme="dark"] .blob { background: #1f1f1e !important; opacity: .6; }
.hero-grid { perspective: 1800px; }
.stage { position: relative; display: grid; place-items: center; transform-style: preserve-3d; }
@keyframes globe { to { transform: rotateY(360deg); } }
.organize { position: relative; z-index: 1; overflow: visible; backdrop-filter: none; -webkit-backdrop-filter: none; transform-style: flat; transform: rotateX(var(--rx, 16deg)) rotateY(var(--ry, -18deg)) rotateZ(3deg); transition: transform .7s var(--ease); background: linear-gradient(150deg, var(--surface), var(--bg-2)); border: 1px solid var(--line); box-shadow: 0 1px 0 rgba(255,255,255,.9) inset, 0 10px 0 -1px var(--bg-3), 0 11px 0 -1px var(--line), 0 60px 90px -30px rgba(0,0,0,.35); }
:root[data-theme="dark"] .organize { box-shadow: 0 50px 90px -30px rgba(0,0,0,.9); }
.organize .edge { stroke: color-mix(in oklab, var(--ink) 55%, transparent); }
.organize .edge.hot { stroke: var(--ink); }
.note { transform: translate(-50%, -50%) translate(var(--x), var(--y)) rotate(var(--r)) scale(var(--sc, 1.06)); box-shadow: 0 1px 0 rgba(255,255,255,.9) inset, 0 calc(var(--lift, 16) * 1px) calc(var(--lift, 16) * 1.6px) -10px rgba(0,0,0,.38); border-color: var(--line); }
.organize.ordered .note { transform: translate(-50%, -50%) translate(var(--ox), var(--oy)) rotate(0deg) scale(1); --lift: 8; }
.organize.ordered .note.hot { transform: translate(-50%, -50%) translate(var(--ox), var(--oy)) translateY(-4px) scale(1.06); --lift: 22; }
.note.work .ic, .note.learn .ic, .note.life .ic { color: var(--ink); }
.note.learn .ic { opacity: .7; } .note.life .ic { opacity: .5; }
.cluster.work, .cluster.learn, .cluster.life { color: var(--ink); background: var(--surface); border: 1px solid var(--line); }
.sweep { background: linear-gradient(100deg, transparent 30%, rgba(255,255,255,.75) 50%, transparent 70%); }
:root[data-theme="dark"] .sweep { background: linear-gradient(100deg, transparent 30%, rgba(255,255,255,.08) 50%, transparent 70%); }
.org-caption .dot, .organize.ordered .org-caption .dot { background: var(--ink); }
@media (max-width: 920px) { .organize { --rx: 10deg; --ry: 0deg; transform: rotateX(var(--rx)) rotateY(var(--ry)); } .globe { width: 110vw; } }

/* 3D unfold on reveal */
html, body { overflow-x: clip; }
.rv { transform: perspective(1200px) rotateX(-10deg) translateY(30px) scale(.98); transform-origin: 50% 0; }
.rv.in { transform: none; }

/* tilt cards with a soft sheen */
[data-tilt] { transform-style: preserve-3d; transition: transform .25s var(--ease), box-shadow .25s; will-change: transform; position: relative; }
[data-tilt]::after { content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 0%), rgba(255,255,255,.55), transparent 45%); opacity: 0; transition: opacity .25s; }
:root[data-theme="dark"] [data-tilt]::after { background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 0%), rgba(255,255,255,.07), transparent 45%); }
.kind[data-tilt]::after { z-index: 2; }

/* chapter details in grayscale */
.chapter:nth-of-type(even) { background: linear-gradient(180deg, var(--bg-2), var(--bg) 75%); }
.panel, .person, .stat, .step3, .tstep, .switch, details.lib { border-color: var(--line); }
.panel-head .badge, .card-h .ico { background: var(--bg-2); color: var(--ink); box-shadow: 2px 2px 0 var(--edge); }
.panel-head .try { color: var(--ink); background: var(--bg-2); }
.callout, .callout.ai { background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--ink); box-shadow: var(--shadow-1); }
.callout .ic, .callout.ai .ic { color: var(--ink); }
.places-out b { color: var(--ink); } .places-out .ok { color: var(--ink); text-decoration: underline; text-underline-offset: 4px; }
.remembered { color: var(--ink); background: var(--bg-2); }
.askg .ln.on { stroke: var(--ink); }
.askg .nd.on rect { stroke: var(--ink); fill: var(--bg-3); }
.answer-box .a .src span { color: var(--ink); background: var(--bg-2); }
/* before / after: light paper vs black */
.ba-side.before { background: var(--bg-2); }
.ba-side.after { background: #0b0b0b; color: #f2f2f1; }
.ba-side.after .who { background: #f2f2f1; color: #0b0b0b; }
.ba-side.after li .ic { color: #f2f2f1; }
.ba-side.after .out { color: #bdbdbb; }
.ba-side.before .who { color: var(--ink); } .ba-side.before li .ic { color: var(--ink); }
:root[data-theme="dark"] .ba-side.after { background: #f2f2f1; color: #0b0b0b; }
:root[data-theme="dark"] .ba-side.after .who { background: #0b0b0b; color: #f2f2f1; }
:root[data-theme="dark"] .ba-side.after li .ic { color: #0b0b0b; } :root[data-theme="dark"] .ba-side.after .out { color: #474747; }
.person blockquote { border-left-color: var(--ink); }
.kind .flipme, .card-f .alt { color: var(--ink); }
.kind .back { background: var(--surface); }
.opt .ic { color: var(--ink); }
.opt:hover { border-color: var(--ink); }
.quiz-progress i.on { background: var(--ink); }
.result small { color: var(--ink-2); }
.result .first { background: var(--bg-2); } .result .first .ic { color: var(--ink); }
.result .medal { background: var(--ink); box-shadow: 4px 4px 0 var(--edge), 0 20px 40px -10px rgba(0,0,0,.35); }
.tstep .when { color: var(--ink-3); }
.tstep .num { background: var(--bg-2); color: var(--ink); }
.tstep.done { background: var(--surface); border-color: var(--ink); }
.tstep.done .num, .tstep.done .check { background: var(--ink); border-color: var(--ink); }
.bar i { background: var(--ink); }
.switch[aria-checked="true"] .toggle { background: var(--ink); }
:root[data-theme="dark"] .switch .toggle::after { background: #0b0b0b; } :root[data-theme="dark"] .switch[aria-checked="false"] .toggle::after { background: #8f8f8d; }
.switch[aria-checked="true"] .ico { background: var(--ink); color: var(--on-ink); }
#venn circle[data-i] { fill: var(--ink); stroke: var(--ink); }
#venn circle.core { fill: var(--ink); }
#venn text.core { fill: var(--bg) !important; }
#venn text:not(.core) { fill: var(--ink-2); }
.verdict.safe, .verdict.warn { background: var(--surface); border: 1px solid var(--line); }
.verdict.safe .ic, .verdict.warn .ic { color: var(--ink); }
.verdict.danger { background: var(--ink); color: var(--bg); }
.verdict.danger .ic { color: var(--bg); }
.plan-top { background: var(--ink); }
.plan-top p { opacity: .75; }
.plan-item .ico { color: var(--ink); box-shadow: 2px 2px 0 var(--edge); }
details.lib summary .ic.lead { color: var(--ink); }
.rail a.on { background: var(--ink); } .rail a.done { background: color-mix(in oklab, var(--ink) 40%, var(--bg-3)); }
.progress { background: var(--ink); }
.term { text-decoration-color: color-mix(in oklab, var(--ink) 45%, transparent); }
.term:hover { color: var(--ink); }
/* guide */
.fab { box-shadow: 0 4px 0 #000, 0 18px 40px -10px rgba(0,0,0,.45); }
:root[data-theme="dark"] .fab { box-shadow: 0 4px 0 #8f8f8d, 0 18px 40px -10px rgba(0,0,0,.8); }
.fab .orb { background: var(--bg); color: var(--ink) !important; }
.fab .orb::after { border-color: color-mix(in oklab, var(--bg) 50%, transparent); }
.brand .orb { box-shadow: 2px 2px 0 var(--edge); }
.g-head .orb, .msg .av { box-shadow: 2px 2px 0 var(--edge); }
.card-b li .ic { color: var(--ink); }
.card-b .ana { background: var(--bg-2); } .card-b .ana .ic { color: var(--ink); }
.card-f .alt { background: var(--bg-2); }
.fu { color: var(--ink); border-color: var(--line); box-shadow: 0 2px 0 var(--edge); }
.fu:hover { background: var(--bg-2); }
.explain { background: var(--bg-2); border: 1px dashed var(--ink-3); }
.ai-tag { color: var(--ink-2); }
.g-head small i { background: var(--ink); }
.smart-card { background: var(--bg-2); border-color: var(--ink-3); }
.g-form input:focus { border-color: var(--ink); box-shadow: 0 0 0 4px color-mix(in oklab, var(--ink) 10%, transparent); }
.g-form button { box-shadow: 0 3px 0 #000; }
:root[data-theme="dark"] .g-form button { box-shadow: 0 3px 0 #8f8f8d; }
.meter i { background: var(--ink); }
@media (prefers-reduced-motion: reduce) { .organize { transform: rotateX(12deg) rotateY(-12deg); } [data-tilt] { transform: none !important; } }

/* ===================== Mobile-first layout ===================== */
/* =========================================================
   Mobile-first layer (phones are the primary experience)
   ========================================================= */
.dock, .ch-sheet, .ch-sheet-back { display: none; }
@media (max-width: 760px) {
  :root { --dock: 74px; }
  body { font-size: 17.5px; padding-bottom: calc(var(--dock) + env(safe-area-inset-bottom)); }
  header.top, .fab, .rail { display: none !important; }

  /* dock in the thumb zone */
  .dock { display: flex; position: fixed; z-index: 60; left: 10px; right: 10px; bottom: calc(10px + env(safe-area-inset-bottom)); height: 64px; align-items: center; gap: 10px; padding: 0 8px 0 14px; background: color-mix(in oklab, var(--surface) 86%, transparent); backdrop-filter: saturate(1.4) blur(18px); -webkit-backdrop-filter: saturate(1.4) blur(18px); border: 1px solid var(--line); border-radius: 22px; box-shadow: 0 3px 0 var(--edge), 0 18px 40px -12px rgba(0,0,0,.3); transition: transform .35s var(--ease); }
  .dock.away { transform: translateY(calc(100% + 20px)); }
  .dock .where { flex: 1; min-width: 0; min-height: 52px; display: grid; align-content: center; gap: 6px; background: none; border: 0; padding: 0; text-align: left; cursor: pointer; color: var(--ink); }
  .dock .where b { font-size: .92rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; display: flex; align-items: center; gap: 6px; }
  .dock .where b .ic { width: 16px; height: 16px; color: var(--ink-3); flex: none; }
  .dock .track { height: 4px; border-radius: 2px; background: var(--bg-3); overflow: hidden; }
  .dock .track i { display: block; height: 100%; width: 0; background: var(--ink); border-radius: 2px; transition: width .3s; }
  .dock .ask { width: 52px; height: 52px; border-radius: 16px; border: 0; background: var(--ink); color: var(--on-ink); display: grid; place-items: center; box-shadow: 0 3px 0 #000; cursor: pointer; flex: none; }
  :root[data-theme="dark"] .dock .ask { box-shadow: 0 3px 0 #8f8f8d; }
  .dock .ask:active { transform: translateY(3px); box-shadow: none; }
  .dock .ask .ic { width: 22px; height: 22px; }

  /* chapter sheet */
  .ch-sheet-back { display: block; position: fixed; inset: 0; z-index: 88; background: rgba(0,0,0,.35); opacity: 0; pointer-events: none; transition: opacity .3s; }
  .ch-sheet-back.open { opacity: 1; pointer-events: auto; }
  .ch-sheet { display: block; position: fixed; z-index: 89; left: 0; right: 0; bottom: 0; background: var(--surface); border-radius: 26px 26px 0 0; padding: 10px 16px calc(18px + env(safe-area-inset-bottom)); box-shadow: 0 -20px 60px rgba(0,0,0,.25); transform: translateY(105%); transition: transform .4s var(--ease); max-height: 86vh; overflow: auto; }
  .ch-sheet.open { transform: none; }
  .ch-sheet .grab { width: 40px; height: 5px; border-radius: 3px; background: var(--bg-3); margin: 0 auto 14px; }
  .ch-sheet h3 { font-size: 1.2rem; margin: 0 4px 10px; }
  .ch-sheet a { display: grid; grid-template-columns: 40px 1fr auto; gap: 12px; align-items: center; min-height: 56px; padding: 6px 8px; border-radius: 14px; color: var(--ink); text-decoration: none; font-weight: 700; }
  .ch-sheet a:active { background: var(--bg-2); }
  .ch-sheet a .n { width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; background: var(--bg-2); font-weight: 800; }
  .ch-sheet a.on .n { background: var(--ink); color: var(--on-ink); }
  .ch-sheet a .ic { color: var(--ink-3); }
  .ch-sheet a.seen .ic { color: var(--ink); }
  .ch-sheet .row { display: flex; gap: 10px; margin-top: 12px; }
  .ch-sheet .row .btn { flex: 1; }

  /* hero: the 3D hook first, then the promise and one clear action */
  .hero { min-height: auto; padding: 18px 0 30px; align-items: start; }
  .hero-grid { gap: 8px; }
  .stage { order: -1; margin: 0 -10px; height: 300px; }
  .organize { width: 100%; max-width: 380px; animation: floaty 7s ease-in-out infinite; }
  @keyframes floaty { 0%, 100% { translate: 0 0; } 50% { translate: 0 -8px; } }
  .globe { width: 128vw; }
  .hero h1 { font-size: clamp(2.4rem, 11vw, 3.1rem); margin: 6px 0 12px; }
  .hero .lede { font-size: 1.04rem; margin-bottom: 20px; }
  .hero-meta { display: none; }
  .org-caption { display: none; } .org-bar { justify-content: center; } .cluster.life { display: none; }
  .eyebrow { font-size: .7rem; padding: 6px 10px; }
  .cta-row .btn { min-height: 54px; font-size: 1rem; }

  /* chapters: tighter rhythm, bigger touch surfaces */
  .chapter { padding: 64px 0 56px; }
  .finale { padding: 64px 0 40px; }
  .ch-head { margin-bottom: 22px; }
  .ch-head h2 { font-size: clamp(1.9rem, 8.6vw, 2.4rem); }
  .ch-head .sub { font-size: 1.05rem; }
  .panel { padding: 16px; border-radius: 20px; margin: 20px -6px; }
  .panel-head { flex-wrap: wrap; }
  .panel-head .try { margin-left: 0; order: 3; }
  .next-ch .btn { width: 100%; justify-content: space-between; }
  .steps3 { grid-template-columns: 1fr; gap: 10px; }
  .step3 { display: grid; grid-template-columns: 44px 1fr; gap: 0 14px; align-items: center; padding: 14px; }
  .step3 .ico { margin: 0; grid-row: span 2; }
  .big-quote { font-size: 1.45rem; margin-bottom: 24px; }
  .places { gap: 8px; }
  .places .chip { min-height: 46px; }
  .week { gap: 12px; }
  .seg { width: 100%; }
  .seg button { flex: 1; justify-content: center; min-height: 46px; }
  .askg > svg { max-height: 220px; }
  .answer-box .q { flex-direction: column; }
  .answer-box .q .chip { justify-content: flex-start; min-height: 48px; }

  /* before / after: a tap toggle with a wipe */
  .ba input[type=range], .ba-handle, .ba-hint { display: none; }
  .ba-side.after { clip-path: inset(0 0 0 100%); transition: clip-path .6s var(--ease); }
  .ba.show-after .ba-side.after { clip-path: inset(0 0 0 0); }
  .ba-side { min-height: 300px; }
  .ba-toggle { display: flex !important; margin: 0 0 12px; }

  /* tools: a swipeable carousel */
  .kinds { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; gap: 12px; margin: 0 -20px; padding: 6px 20px 18px; scrollbar-width: none; }
  .kinds::-webkit-scrollbar { display: none; }
  .kind { flex: 0 0 82%; scroll-snap-align: center; min-height: 300px; }
  .swipe-hint { display: flex !important; justify-content: center; gap: 6px; margin-top: 2px; }
  .swipe-hint i { width: 7px; height: 7px; border-radius: 50%; background: var(--bg-3); transition: background .2s, width .2s; }
  .swipe-hint i.on { background: var(--ink); width: 20px; border-radius: 4px; }
  .opts { gap: 10px; }
  .opt { min-height: 0; grid-template-columns: 30px 1fr; align-items: center; gap: 2px 12px; padding: 14px; }
  .opt .ic { grid-row: span 2; }

  .timeline { gap: 10px; }
  .tstep { grid-template-columns: 1fr auto; padding: 14px; gap: 10px; }
  .tstep .num { display: none; }
  .template { font-size: .8rem; padding: 14px; }
  .safety { gap: 10px; }
  .venn { max-width: 240px; }
  .switch { min-height: 76px; }
  .plan-item { grid-template-columns: 42px 1fr; }
  .plan-item > :last-child { grid-column: 2; justify-self: start; }
  .plan-actions .btn { flex: 1 1 100%; }
  footer { padding-bottom: 40px; }

  /* touch feedback replaces hover tilt */
  [data-tilt]:active { transform: scale(.985); }
  .btn:hover, .chip:hover, .opt:hover { transform: none; }

  /* the guide rises from the bottom like a native sheet */
  .guide { top: 0; transform: translateY(105%); border-radius: 0; }
  .guide.open { transform: none; }
  .g-head { padding-top: calc(12px + env(safe-area-inset-top)); }
  .g-form { padding-bottom: calc(12px + env(safe-area-inset-bottom)); }
  .g-form input { font-size: 16px; }
  .toast { bottom: calc(var(--dock) + 24px); }
}
.swipe-hint { display: none; }
.ba-toggle { display: none; }

/* ===================== Glass surfaces and hero graph ===================== */
/* =========================================================
   Glass layer + live 3D knowledge graph in the hero
   ========================================================= */
:root {
  --glass: rgba(255,255,255,.58);
  --glass-strong: rgba(255,255,255,.74);
  --glass-line: rgba(255,255,255,.75);
  --glass-edge: rgba(0,0,0,.07);
  --glass-shadow: inset 0 1px 0 rgba(255,255,255,.9), inset 0 -1px 0 rgba(0,0,0,.03), 0 10px 30px -10px rgba(0,0,0,.14);
  --blur: blur(18px) saturate(1.5);
}
:root[data-theme="dark"] {
  --glass: rgba(28,28,28,.52);
  --glass-strong: rgba(30,30,30,.72);
  --glass-line: rgba(255,255,255,.09);
  --glass-edge: rgba(255,255,255,.06);
  --glass-shadow: inset 0 1px 0 rgba(255,255,255,.07), 0 14px 40px -12px rgba(0,0,0,.7);
}

/* a soft, drifting monochrome backdrop that the glass blurs */
body { background: var(--bg); }
.backdrop { position: fixed; inset: 0; z-index: -1; pointer-events: none; overflow: hidden; }
.backdrop i { position: absolute; border-radius: 50%; filter: blur(70px); opacity: .9; animation: float 26s ease-in-out infinite alternate; }
.backdrop i:nth-child(1) { width: 52vmax; height: 52vmax; left: -14vmax; top: -12vmax; background: radial-gradient(circle, #d9d9d7, transparent 70%); }
.backdrop i:nth-child(2) { width: 46vmax; height: 46vmax; right: -12vmax; top: 30vh; background: radial-gradient(circle, #cfcfcd, transparent 70%); animation-delay: -9s; }
.backdrop i:nth-child(3) { width: 40vmax; height: 40vmax; left: 20vw; bottom: -16vmax; background: radial-gradient(circle, #e3e3e1, transparent 70%); animation-delay: -17s; }
.backdrop::after { content: ""; position: absolute; inset: 0; background-image: radial-gradient(color-mix(in oklab, var(--ink) 9%, transparent) 1px, transparent 1px); background-size: 22px 22px; mask-image: radial-gradient(ellipse at 50% 30%, #000 20%, transparent 75%); -webkit-mask-image: radial-gradient(ellipse at 50% 30%, #000 20%, transparent 75%); }
:root[data-theme="dark"] .backdrop i:nth-child(1) { background: radial-gradient(circle, #222, transparent 70%); }
:root[data-theme="dark"] .backdrop i:nth-child(2) { background: radial-gradient(circle, #1c1c1c, transparent 70%); }
:root[data-theme="dark"] .backdrop i:nth-child(3) { background: radial-gradient(circle, #262626, transparent 70%); }
@keyframes float { to { transform: translate(6vw, 5vh) scale(1.08); } }
.chapter, .chapter:nth-of-type(even), .finale { background: transparent !important; }
.blob { display: none; }

/* glass surfaces */
.panel, .person, .stat, .step3, .kind .face, .tstep, .switch, .plan, details.lib, .eyebrow, .callout, .opt, .answer-box, .verdict.safe, .verdict.warn, .chip, .seg, .icon-btn, .btn:not(.primary), .fu, .card, .msg.bot .b, .smart-card, .explain, .plan-item, .day, .result .first {
  background: var(--glass) !important; backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
  border-color: var(--glass-line) !important; box-shadow: var(--glass-shadow);
}
.chip[aria-pressed="true"], .seg button[aria-pressed="true"] { background: var(--ink) !important; }
.chip[aria-pressed="true"] { border-color: var(--ink) !important; }
.panel { border: 1px solid var(--glass-line); }
.kind .back { background: var(--glass-strong) !important; }
.tstep.done { border-color: var(--ink) !important; }
.panel .panel, .panel .answer-box, .panel .day { box-shadow: inset 0 1px 0 rgba(255,255,255,.6); }
.panel-head .badge, .card-h .ico, .plan-item .ico, .tstep .num, .switch .ico { background: var(--glass-strong); backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur); }
.switch[aria-checked="true"] .ico { background: var(--ink); }
.template { background: rgba(11,11,11,.9); backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur); }
header.top { background: var(--glass) !important; border-bottom: 1px solid var(--glass-line); box-shadow: 0 1px 0 var(--glass-edge); }
.dock { background: var(--glass) !important; border: 1px solid var(--glass-line) !important; box-shadow: var(--glass-shadow), 0 18px 40px -12px rgba(0,0,0,.25) !important; }
.guide, .ch-sheet { background: var(--glass-strong) !important; backdrop-filter: blur(26px) saturate(1.6); -webkit-backdrop-filter: blur(26px) saturate(1.6); border-color: var(--glass-line) !important; }
.g-head, .g-mode, .g-form { background: transparent; border-color: var(--glass-edge); }
.g-form input { background: var(--glass); border-color: var(--glass-line); backdrop-filter: var(--blur); }
.toast { background: rgba(11,11,11,.78) !important; backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur); }
:root[data-theme="dark"] .toast { background: rgba(242,242,241,.86) !important; }
.pop { background: rgba(11,11,11,.86); backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur); }
.guide-back, .ch-sheet-back { backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); }

/* hero: the card gives way to a live graph */
.organize { background: transparent !important; border: 0 !important; box-shadow: none !important; transform: none !important; animation: none !important; aspect-ratio: 1 / 1 !important; max-width: 600px !important; }
.organize::before { display: none; }
#orgNotes, .organize svg.edges, .organize .sweep, .organize .cluster { display: none !important; }
#brainGraph { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: pan-y; }
@media (pointer: fine) { #brainGraph { cursor: grab; } #brainGraph.drag { cursor: grabbing; } }
.org-bar { left: 50% !important; right: auto !important; bottom: 6% !important; transform: translateX(-50%); justify-content: center; gap: 10px; z-index: 2; }
.org-caption { background: var(--glass) !important; backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur); border-color: var(--glass-line) !important; box-shadow: var(--glass-shadow); white-space: nowrap; }
.globe i { border-color: color-mix(in oklab, var(--ink) 7%, transparent); }
.graph-tip { position: absolute; z-index: 3; pointer-events: none; transform: translate(-50%, calc(-100% - 12px)); padding: 6px 10px; border-radius: 10px; font-size: .78rem; font-weight: 700; white-space: nowrap; background: var(--glass-strong); backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur); border: 1px solid var(--glass-line); box-shadow: var(--glass-shadow); color: var(--ink); }
.graph-tip[hidden] { display: none; }
@media (max-width: 920px) { .organize { max-width: 440px !important; } }
.org-caption { display: none !important; }
@media (max-width: 760px) {
  .stage { height: 360px; margin: 0 -20px; }
  .organize { width: 100% !important; max-width: 390px !important; height: 100% !important; aspect-ratio: auto !important; }
  .org-bar { bottom: 4px !important; }
}
@media (prefers-reduced-motion: reduce) { .backdrop i { animation: none; } }

/* ===================== Calm polish ===================== */
/* =========================================================
   Premium + smooth: no CSS 3D, glass only on floating layers
   ========================================================= */
/* remove 3D */
.globe { display: none !important; }
.hero-grid { perspective: none; }
.hero h1 .g, :root[data-theme="dark"] .hero h1 .g { text-shadow: none; color: var(--ink-3); -webkit-text-fill-color: currentColor; }
.stat .n { text-shadow: none; }
[data-tilt] { transform: none !important; will-change: auto; }
[data-tilt]::after { display: none !important; }
.rv { transform: translateY(14px) !important; opacity: 0; transition: opacity .6s cubic-bezier(.2,.7,.2,1), transform .6s cubic-bezier(.2,.7,.2,1) !important; }
.rv.in { transform: none !important; opacity: 1; }
.backdrop i { animation: none !important; }

/* calm, soft depth instead of chunky edges */
.btn, .chip, .icon-btn, .fu, .g-form button, .dock .ask, .fab, .seg button[aria-pressed="true"] { box-shadow: 0 1px 2px rgba(0,0,0,.06), 0 4px 14px -6px rgba(0,0,0,.14) !important; }
.btn:hover { transform: translateY(-1px); }
.btn:active, .chip:active, .dock .ask:active { transform: scale(.98); box-shadow: 0 1px 2px rgba(0,0,0,.08) !important; }
.btn.primary { box-shadow: 0 1px 2px rgba(0,0,0,.2), 0 10px 24px -10px rgba(0,0,0,.45) !important; }
:root[data-theme="dark"] .btn.primary { box-shadow: 0 10px 24px -10px rgba(0,0,0,.9) !important; }
.ch-num .n, .panel-head .badge, .card-h .ico, .plan-item .ico, .brand .orb, .g-head .orb, .msg .av, .result .medal { box-shadow: none !important; }
.fab { box-shadow: 0 12px 30px -10px rgba(0,0,0,.45) !important; }

/* content surfaces: solid, quiet, hairline borders */
.panel, .person, .stat, .step3, .kind .face, .tstep, .switch, .plan, details.lib, .callout, .opt, .answer-box, .verdict.safe, .verdict.warn, .chip, .btn:not(.primary), .fu, .card, .msg.bot .b, .smart-card, .explain, .plan-item, .day, .result .first, .icon-btn {
  backdrop-filter: none !important; -webkit-backdrop-filter: none !important;
}
.panel, .person, .stat, .step3, .kind .face, .tstep, .switch, .plan, details.lib, .opt, .card, .chip, .btn:not(.primary), .fu, .icon-btn {
  background: var(--surface) !important; border: 1px solid var(--line) !important;
}
.panel, .plan, .kind .face { box-shadow: 0 1px 2px rgba(0,0,0,.04), 0 24px 48px -28px rgba(0,0,0,.22) !important; }
.person, .stat, .step3, .tstep, .switch, details.lib, .opt, .card { box-shadow: 0 1px 2px rgba(0,0,0,.04), 0 10px 26px -18px rgba(0,0,0,.2) !important; }
:root[data-theme="dark"] .panel, :root[data-theme="dark"] .plan, :root[data-theme="dark"] .kind .face, :root[data-theme="dark"] .person, :root[data-theme="dark"] .stat, :root[data-theme="dark"] .step3, :root[data-theme="dark"] .tstep, :root[data-theme="dark"] .switch, :root[data-theme="dark"] details.lib, :root[data-theme="dark"] .opt, :root[data-theme="dark"] .card { box-shadow: 0 24px 48px -28px rgba(0,0,0,.9) !important; }
.kind .back { background: var(--bg-2) !important; }
.answer-box, .day, .plan-item, .result .first, .callout, .msg.bot .b, .smart-card, .explain { background: var(--bg-2) !important; border-color: transparent !important; box-shadow: none !important; }
.callout { border-left: 3px solid var(--ink) !important; }
.chip[aria-pressed="true"] { background: var(--ink) !important; border-color: var(--ink) !important; }
.tstep.done { border-color: var(--ink) !important; }
.panel .panel { box-shadow: none !important; }
.panel-head .badge, .card-h .ico, .plan-item .ico, .tstep .num, .switch .ico { background: var(--bg-2) !important; backdrop-filter: none !important; }
.switch[aria-checked="true"] .ico, .tstep.done .num { background: var(--ink) !important; }
.template { background: #0f0f0f !important; backdrop-filter: none !important; }

/* glass where it belongs: floating layers */
.eyebrow, .org-caption, .org-bar .seg, .dock, header.top, .guide, .ch-sheet, .toast, .pop, .graph-tip, .seg {
  backdrop-filter: blur(20px) saturate(1.6) !important; -webkit-backdrop-filter: blur(20px) saturate(1.6) !important;
}
.eyebrow, .org-caption, .org-bar .seg, .graph-tip { background: var(--glass) !important; border: 1px solid var(--glass-line) !important; box-shadow: var(--glass-shadow) !important; }
.seg { background: color-mix(in oklab, var(--bg-2) 80%, transparent) !important; border: 1px solid var(--line) !important; box-shadow: none !important; }

/* typography: calm and confident */
.hero h1 { letter-spacing: -0.045em; font-weight: 800; }
.ch-head h2 { letter-spacing: -0.035em; }
.prose, .ch-head .sub { line-height: 1.7; }

/* phones: the graph needs room, nothing floats */
@media (max-width: 760px) {
  .organize { animation: none !important; }
}

/* ===================== Type scale and spacing ===================== */
/* fewer labels, calmer type */
.eyebrow, .hero-meta, .panel-head .try { display: none !important; }
body { font-size: 16px; line-height: 1.6; }
.hero h1 { font-size: clamp(2.4rem, 4.4vw, 3.6rem) !important; margin: 0 0 16px !important; }
.hero .lede { font-size: 1.05rem !important; max-width: 470px; }
.ch-head h2 { font-size: clamp(1.6rem, 3vw, 2.25rem) !important; }
.ch-head .sub { font-size: 1rem !important; }
.prose, .prose p { font-size: 1rem !important; }
.big-quote { font-size: clamp(1.2rem, 2vw, 1.5rem) !important; }
.panel-head h3 { font-size: 1.02rem !important; }
.kind h3, .person b { font-size: 1.05rem !important; }
.qstep h4 { font-size: 1.15rem !important; }
.result h4 { font-size: 1.25rem !important; }
.plan-top h2 { font-size: clamp(1.5rem, 3vw, 2rem) !important; }
.stat .n { font-size: 1.6rem !important; }
.ch-num { font-size: .72rem !important; }
.ch-num .n { width: 28px !important; height: 28px !important; font-size: .85rem !important; border-radius: 8px !important; }
.chapter { padding: 88px 0 72px !important; }
@media (max-width: 760px) {
  body { font-size: 16px; }
  .hero h1 { font-size: clamp(2rem, 9vw, 2.5rem) !important; }
  .hero .lede { font-size: 1rem !important; }
  .ch-head h2 { font-size: clamp(1.5rem, 7vw, 1.85rem) !important; }
  .chapter { padding: 56px 0 48px !important; }
  .cta-row .btn { min-height: 50px !important; font-size: .95rem !important; }
  .toast button { min-height: 44px; }
}

/* ===================== Tools cards, safety diagram, plan, landscape map ===================== */
/* ---------- tools: consistent cards ---------- */
.kinds { align-items: stretch; }
.kind { min-height: 268px !important; }
.kind .face { justify-content: flex-start !important; gap: 8px !important; padding: 20px !important; }
.kind .k-ico { flex: none !important; width: 44px !important; height: 44px !important; border-radius: 13px !important; margin-bottom: 6px; }
.kind .k-ico .ic { width: 22px !important; height: 22px !important; }
.kind .kn { position: absolute; top: 20px; right: 20px; font-size: .75rem; font-weight: 800; letter-spacing: .08em; color: var(--ink-3); }
.kind h3 { margin: 0; line-height: 1.25; }
.kind .like { font-size: .9rem !important; line-height: 1.5; font-weight: 500 !important; }
.kind .eg { margin-top: auto !important; display: block !important; font-size: .78rem; font-weight: 700; color: var(--ink-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; padding-top: 12px; border-top: 1px solid var(--line); }
.kind .eg span { background: none !important; padding: 0 !important; border-radius: 0 !important; font-size: inherit !important; color: inherit !important; }
.kind .eg span + span::before { content: " · "; color: var(--ink-3); }
.kind .flipme { font-size: .78rem !important; margin-top: 2px; }
.kind .back dl { gap: 12px !important; }
.kind .back h3 { margin-bottom: 4px; }

/* ---------- safety: glowing venn ---------- */
.venn { overflow: visible; max-width: 340px !important; }
.venn .ring { fill: var(--ink); fill-opacity: .035; stroke: var(--ink); stroke-opacity: .28; stroke-width: 1.4; transition: fill-opacity .45s, stroke-opacity .45s, stroke-width .45s; }
.venn .halo { fill: none; stroke: var(--ink); stroke-width: 10; stroke-opacity: 0; filter: url(#vglow); transition: stroke-opacity .45s; }
.venn.on0 .r0, .venn.on1 .r1, .venn.on2 .r2 { fill-opacity: .1; stroke-opacity: .9; stroke-width: 1.8; }
.venn.on0 .h0, .venn.on1 .h1, .venn.on2 .h2 { stroke-opacity: .22; }
:root[data-theme="dark"] .venn.on0 .h0, :root[data-theme="dark"] .venn.on1 .h1, :root[data-theme="dark"] .venn.on2 .h2 { stroke-opacity: .45; }
.venn .lbl { font: 700 12.5px Manrope, system-ui, sans-serif; fill: var(--ink-3); transition: fill .3s; }
.venn.on0 .l0, .venn.on1 .l1, .venn.on2 .l2 { fill: var(--ink); }
.venn .vi { color: var(--ink-3); transition: color .3s; }
.venn.on0 .i0, .venn.on1 .i1, .venn.on2 .i2 { color: var(--ink); }
.venn .core-glow { fill: var(--ink); opacity: 0; filter: url(#vglow2); transition: opacity .45s; }
.venn .core-dot { fill: var(--ink); opacity: 0; transition: opacity .45s; }
.venn .core-mark { fill: var(--bg); opacity: 0; font: 800 16px Manrope, system-ui, sans-serif; transition: opacity .45s; }
.venn.all .core-glow { opacity: .55; animation: vpulse 1.8s ease-in-out infinite; }
.venn.all .core-dot, .venn.all .core-mark { opacity: 1; }
@keyframes vpulse { 50% { opacity: .2; } }
#venn circle[data-i], #venn > .core, #venn > text { display: none; }
@media (prefers-reduced-motion: reduce) { .venn.all .core-glow { animation: none; } }

/* ---------- plan: compact rows ---------- */
.plan-top { padding: 22px 24px !important; }
.plan-top h2 { font-size: 1.45rem !important; }
.plan-top p { margin-top: 4px !important; font-size: .9rem; }
.plan-body { display: grid !important; grid-template-columns: 1fr 1fr; gap: 10px !important; padding: 16px !important; }
.plan-item { display: grid !important; grid-template-columns: 38px 1fr auto !important; gap: 12px !important; align-items: center !important; padding: 12px 14px !important; border-radius: 14px !important; min-height: 0 !important; }
.plan-item .ico { width: 38px !important; height: 38px !important; border-radius: 11px !important; align-self: center; }
.plan-item b { font-size: .93rem !important; line-height: 1.3; }
.plan-item span { font-size: .82rem !important; line-height: 1.45 !important; }
.plan-item div > span { display: block; margin-top: 2px; }
.plan-item > :last-child { grid-column: auto !important; justify-self: end !important; }
.plan-item .btn.small { min-height: 34px !important; padding: 0 14px !important; font-size: .8rem !important; }
.plan-actions { grid-column: 1 / -1; margin-top: 4px !important; }
.plan-actions .btn { flex: 0 1 auto !important; }
@media (max-width: 760px) {
  .plan-body { grid-template-columns: 1fr; padding: 12px !important; }
  .plan-item { grid-template-columns: 34px 1fr auto !important; padding: 12px !important; }
  .plan-item .ico { width: 34px !important; height: 34px !important; }
  .plan-item .btn.small { min-height: 44px !important; }
  .plan-actions .btn { flex: 1 1 auto !important; }
}

/* ---------- landscape explorer ---------- */
.lx { display: grid; gap: 14px; }
.lx-filters { display: flex; gap: 6px; flex-wrap: wrap; }
.lx-filters button { display: inline-flex; align-items: center; gap: 7px; min-height: 36px; padding: 0 12px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--ink-2); font: 650 .8rem Manrope, system-ui, sans-serif; cursor: pointer; }
.lx-filters button[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.lx-filters .mk { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.lx-main { display: grid; grid-template-columns: 1.5fr 1fr; gap: 14px; align-items: stretch; }
.lx-map { position: relative; aspect-ratio: 1.35 / 1; border-radius: 16px; border: 1px solid var(--line); background:
  linear-gradient(var(--line), var(--line)) 50% 0 / 1px 100% no-repeat,
  linear-gradient(var(--line), var(--line)) 0 50% / 100% 1px no-repeat, var(--bg-2); overflow: hidden; }
.lx-axis { position: absolute; font: 700 .68rem Manrope, system-ui, sans-serif; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); pointer-events: none; }
.lx-axis.x0 { left: 12px; bottom: 10px; } .lx-axis.x1 { right: 12px; bottom: 10px; }
.lx-axis.y0 { left: 12px; bottom: 10px; }
.lx-xaxis { display: flex; justify-content: space-between; font: 700 .68rem Manrope, system-ui, sans-serif; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); padding: 6px 4px 0; } .lx-axis.y1 { left: 12px; top: 10px; }
.lx-dot { position: absolute; transform: translate(-50%, -50%); display: inline-flex; align-items: center; gap: 6px; padding: 4px 9px 4px 6px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); font: 700 .74rem Manrope, system-ui, sans-serif; color: var(--ink); cursor: pointer; white-space: nowrap; transition: transform .25s, opacity .25s, box-shadow .2s; box-shadow: 0 2px 8px -4px rgba(0,0,0,.25); }
.lx-dot:hover, .lx-dot:focus-visible { transform: translate(-50%, -50%) scale(1.06); z-index: 3; }
.lx-dot[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); z-index: 4; }
.lx-dot.dim { opacity: .18; pointer-events: none; }
.lx-dot .mk, .lx-filters .mk { flex: none; }
.mk.k0 { background: var(--ink); } .mk.k1 { background: transparent; box-shadow: inset 0 0 0 2px var(--ink); } .mk.k2 { background: #8a8a88; } .mk.k3 { background: transparent; box-shadow: inset 0 0 0 2px #8a8a88; } .mk.k4 { background: var(--ink); border-radius: 2px !important; } .mk.k5 { background: transparent; box-shadow: inset 0 0 0 2px var(--ink); border-radius: 2px !important; }
.lx-dot[aria-pressed="true"] .mk.k0, .lx-dot[aria-pressed="true"] .mk.k4 { background: var(--bg); }
.lx-dot[aria-pressed="true"] .mk.k1, .lx-dot[aria-pressed="true"] .mk.k5 { box-shadow: inset 0 0 0 2px var(--bg); }
.lx-card { border: 1px solid var(--line); background: var(--surface); border-radius: 16px; padding: 16px; display: flex; flex-direction: column; gap: 8px; min-height: 100%; }
.lx-card .kd { font: 700 .7rem Manrope, system-ui, sans-serif; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); display: flex; gap: 7px; align-items: center; }
.lx-card h4 { margin: 0; font-size: 1.15rem; letter-spacing: -.02em; }
.lx-card p { margin: 0; font-size: .88rem; color: var(--ink-2); line-height: 1.5; }
.lx-card dl { margin: 4px 0 0; display: grid; grid-template-columns: auto 1fr; gap: 6px 12px; font-size: .82rem; }
.lx-card dt { color: var(--ink-3); font-weight: 600; } .lx-card dd { margin: 0; font-weight: 700; }
.lx-card .hint { color: var(--ink-3); font-size: .85rem; }
.lx-foot { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.lx-foot small { color: var(--ink-3); font-size: .78rem; }
.lx-foot button { font: 700 .8rem Manrope, system-ui, sans-serif; color: var(--ink); background: none; border: 0; text-decoration: underline; text-underline-offset: 3px; cursor: pointer; min-height: 36px; }
.lx-list[hidden] { display: none; }
@media (max-width: 760px) {
  .lx-main { grid-template-columns: 1fr; }
  .lx-map { aspect-ratio: .95 / 1; }
  .lx-dot { font-size: .68rem; padding: 0 8px 0 6px; min-height: 28px; }
  .plan-item div > span { display: block; line-height: 1.45 !important; margin-top: 2px; }
  .lx-filters { flex-wrap: nowrap; overflow-x: auto; margin: 0 -18px; padding: 0 18px 4px; scrollbar-width: none; }
  .lx-filters::-webkit-scrollbar { display: none; }
  .lx-filters button { flex: none; min-height: 40px; }
  .lx-foot button { min-height: 44px; }
}
@media (max-width: 370px) {
  .lx-dot { font-size: .62rem; padding: 0 6px 0 5px; gap: 4px; }
  .lx-map { aspect-ratio: .85 / 1; }
}

/* ===================== Background relief and chapter shapes ===================== */
/* grey 3D geometric relief, light background */
.geo { display: none !important; }
.backdrop::after { display: none; }
.chapter, .finale { overflow: hidden; position: relative; }
.relief-bg { position: fixed; inset: 0; z-index: -1; pointer-events: none;
  --t: #fafaf9; --l: #f1f1f0; --r: #e9e9e7; --line: rgba(0,0,0,.025);
  background-color: var(--bg);
  -webkit-mask-image: linear-gradient(90deg, #000 0%, rgba(0,0,0,.55) 14%, transparent 26%, transparent 74%, rgba(0,0,0,.55) 86%, #000 100%);
  mask-image: linear-gradient(90deg, #000 0%, rgba(0,0,0,.55) 14%, transparent 26%, transparent 74%, rgba(0,0,0,.55) 86%, #000 100%); }
:root[data-theme="dark"] .relief-bg { --t: #171716; --l: #121211; --r: #0e0e0d; --line: rgba(255,255,255,.025); }
.relief-bg svg { width: 100%; height: 100%; display: block; }
@media (max-width: 760px) { .relief-bg { -webkit-mask-image: linear-gradient(90deg, rgba(0,0,0,.7), transparent 18%, transparent 82%, rgba(0,0,0,.7)); mask-image: linear-gradient(90deg, rgba(0,0,0,.7), transparent 18%, transparent 82%, rgba(0,0,0,.7)); } }

.solid3d { position: absolute; z-index: 0; pointer-events: none; width: min(300px, 25vw); height: auto; overflow: visible; }
.solid3d.tr { top: 50px; right: 70px; } .solid3d.bl { bottom: 40px; left: 40px; }
.solid3d .float { animation: s3float 10s ease-in-out infinite alternate; transform-box: fill-box; }
.solid3d .float.b { animation-duration: 13s; animation-direction: alternate-reverse; }
@keyframes s3float { to { transform: translateY(-10px); } }
.solid3d { opacity: 0; transform: translateY(16px); transition: opacity 1s ease, transform 1.2s cubic-bezier(.2,.7,.2,1); }
.solid3d.in { opacity: 1; transform: none; }
:root[data-theme="dark"] .solid3d { filter: brightness(.32) contrast(1.15); }
.chapter > .wrap, .chapter > .narrow, .finale > .narrow { position: relative; z-index: 1; }
@media (max-width: 1100px) { .solid3d { width: 200px; } .solid3d.tr { right: 24px; } }
@media (max-width: 760px) { .solid3d { width: 120px; opacity: 0; } .solid3d.in { opacity: .85; } .solid3d.tr { top: 14px; bottom: auto; right: -12px; } .solid3d.bl { display: none; } }
@media (prefers-reduced-motion: reduce) { .solid3d .float { animation: none; } .solid3d { transition: none; opacity: 1; transform: none; } }

/* ===================== App install and offline ===================== */
.install-btn { margin-right: 8px; }
.install-row { width: 100%; margin-top: 12px; }
.install-btn[hidden], .install-row[hidden] { display: none !important; }
.ios-tip { display: flex; gap: 10px; align-items: flex-start; margin-top: 12px; padding: 12px 14px; border-radius: 14px; background: var(--bg-2); font-size: .85rem; color: var(--ink-2); line-height: 1.5; }
.ios-tip .ic { flex: none; margin-top: 2px; color: var(--ink); }
.ios-tip[hidden] { display: none; }
.offline-pill { position: fixed; top: 12px; left: 50%; transform: translateX(-50%); z-index: 95; display: inline-flex; align-items: center; gap: 8px; padding: 7px 14px; border-radius: 999px; background: var(--ink); color: var(--bg); font: 700 .8rem Manrope, system-ui, sans-serif; box-shadow: 0 8px 24px rgba(0,0,0,.25); }
.offline-pill[hidden] { display: none; }
.offline-pill i { width: 7px; height: 7px; border-radius: 50%; background: var(--bg); opacity: .6; }
.smart-ready { display: inline-flex; gap: 6px; align-items: center; font-size: .8rem; font-weight: 700; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 999px; padding: 4px 10px; }

.ch-sheet a.on .n .ic { color: var(--on-ink, #fff); }