/* Sidonie 伴学 · marketing site
   No external fonts or CDNs: system CJK stacks + a self-hosted Latin display face (Fraunces, SIL OFL). */

@font-face {
  font-family: 'Fraunces';
  font-weight: 600;
  font-style: normal;
  font-display: swap;
  src: url('fonts/Fraunces-SemiBold.ttf') format('truetype');
  unicode-range: U+0000-00FF, U+2013-201D, U+2026; /* Latin only; CJK falls through to system serifs */
}

:root {
  --cream: #FFFCF9;
  --paper: #FAF7F2;
  --sand: #F4EEE5;
  --stone-100: #F5F5F4;
  --stone-200: #E7E5E4;
  --stone-300: #D6D3D1;
  --stone-400: #A8A29E;
  --stone-500: #78716C;
  --stone-600: #57534E;
  --stone-700: #44403C;
  --stone-800: #292524;
  --stone-900: #1C1917;
  --amber: #E79A3B;
  --amber-soft: #F2B45C;
  --amber-wash: #FDF3E4;
  --amber-ink: #8A4F0C; /* amber for text: 6.5:1 on cream */
  --peach: #F7D3A1;

  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans CJK SC", "Source Han Sans SC", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --serif: "Fraunces", "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", "Noto Serif SC",
    "Microsoft YaHei", Georgia, serif;

  --radius: 20px;
  --shadow-sm: 0 1px 2px rgba(28, 25, 23, .05);
  --shadow: 0 1px 2px rgba(28, 25, 23, .04), 0 10px 30px rgba(28, 25, 23, .08);
  --shadow-lg: 0 2px 4px rgba(28, 25, 23, .04), 0 24px 60px rgba(28, 25, 23, .14);
  --wrap: 1160px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
  color: var(--stone-800);
  background: var(--cream);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
html[lang="en"] body { line-height: 1.65; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
h1, h2, h3 { color: var(--stone-900); margin: 0; font-weight: 600; }
p { margin: 0; text-wrap: pretty; }
li { text-wrap: pretty; }
h1, h2, h3 { text-wrap: balance; }
/* Chinese headings: break at punctuation rather than mid-phrase, but never overflow */
html[lang="zh-CN"] :is(h1, h2, h3) { word-break: keep-all; overflow-wrap: anywhere; }
ul { margin: 0; padding: 0; }

:focus-visible { outline: 3px solid var(--amber-ink); outline-offset: 3px; border-radius: 6px; }
.section-dark :focus-visible { outline-color: var(--amber-soft); }

.skip-link {
  position: absolute; left: 16px; top: -60px; z-index: 100;
  background: var(--stone-900); color: var(--cream); padding: 10px 16px; border-radius: 10px; text-decoration: none;
}
.skip-link:focus { top: 12px; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 28px; }
.serif { font-family: var(--serif); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.zh-mark { font-family: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", "Microsoft YaHei", serif; font-weight: 700; letter-spacing: .04em; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 252, 249, .82);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.site-header.scrolled { border-color: var(--stone-200); box-shadow: 0 1px 0 rgba(28, 25, 23, .02); }
.site-header .wrap { display: flex; align-items: center; gap: 28px; height: 68px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--stone-900); }
.brand img { width: 36px; height: 36px; filter: drop-shadow(0 1px 2px rgba(28, 25, 23, .18)); }
.brand .en { font-family: var(--serif); font-size: 23px; letter-spacing: -.005em; line-height: 1; }
.brand .sep { width: 1.5px; height: 17px; background: var(--stone-300); border-radius: 2px; }
.brand .zh-mark { font-size: 18px; line-height: 1; color: var(--stone-700); }
.nav { display: flex; gap: 26px; margin-left: 12px; }
.nav a { text-decoration: none; font-size: 15px; color: var(--stone-600); transition: color .2s; }
.nav a:hover { color: var(--stone-900); }
.header-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.lang-switch {
  font-size: 14px; text-decoration: none; color: var(--stone-600); padding: 6px 12px;
  border: 1px solid var(--stone-200); border-radius: 999px; background: #fff; transition: border-color .2s, color .2s;
}
.lang-switch:hover { color: var(--stone-900); border-color: var(--stone-300); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  font: inherit; font-size: 16px; font-weight: 600; line-height: 1; text-decoration: none;
  padding: 15px 24px; border-radius: 999px; border: 1px solid transparent; cursor: pointer;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), background-color .2s, border-color .2s;
}
.btn svg { width: 18px; height: 18px; flex: none; }
.btn-primary { background: var(--stone-900); color: var(--cream); box-shadow: 0 6px 18px rgba(28, 25, 23, .18); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(28, 25, 23, .22); background: #000; }
.btn-secondary { background: #fff; color: var(--stone-900); border-color: var(--stone-300); }
.btn-secondary:hover { border-color: var(--stone-500); transform: translateY(-1px); }
.btn-sm { padding: 9px 16px; font-size: 14px; }
.btn-light { background: var(--cream); color: var(--stone-900); }
.btn-light:hover { transform: translateY(-1px); background: #fff; }
.btn-ghost-light { color: var(--cream); border-color: rgba(255, 252, 249, .35); background: transparent; }
.btn-ghost-light:hover { border-color: var(--cream); transform: translateY(-1px); }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden; padding: 84px 0 0;
  background:
    radial-gradient(720px 420px at 8% -6%, rgba(242, 180, 92, .20), transparent 70%),
    radial-gradient(760px 520px at 100% 40%, rgba(247, 211, 161, .26), transparent 70%),
    var(--cream);
}
.hero-copy { text-align: center; max-width: 820px; margin: 0 auto; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px; font-size: 14px; color: var(--stone-600);
  padding: 7px 15px; border-radius: 999px; background: rgba(255, 255, 255, .8); border: 1px solid var(--stone-200);
}
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--amber); display: inline-block; flex: none; }
.hero h1 {
  margin-top: 26px; font-family: var(--serif); font-size: clamp(42px, 6.4vw, 76px); line-height: 1.16;
  letter-spacing: .02em;
}
html[lang="en"] .hero h1 { letter-spacing: -.012em; line-height: 1.08; }
.hl { position: relative; z-index: 0; white-space: nowrap; }
.hl::after {
  content: ''; position: absolute; z-index: -1; left: -.08em; right: -.08em; bottom: .08em; height: .32em;
  background: rgba(242, 180, 92, .45); border-radius: 6px;
}
.hero .lead { margin: 24px auto 0; max-width: 640px; font-size: clamp(17px, 1.6vw, 19px); color: var(--stone-600); }
.cta-row { margin-top: 34px; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero-note { margin-top: 18px; font-size: 14px; color: var(--stone-500); display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; }
.hero-note span { display: inline-flex; align-items: center; gap: 7px; }
.hero-note svg { width: 15px; height: 15px; color: var(--amber-ink); }

.stage { position: relative; isolation: isolate; max-width: 1080px; margin: 64px auto 0; padding: 0 0 72px; }
/* the moon rabbit sits on the window's top edge, reading; its body is tucked behind the window */
.stage-rabbit { position: absolute; z-index: -1; right: 10%; top: 0; width: 168px; height: auto; transform: translateY(-90%); pointer-events: none; }
.window {
  background: #fff; border-radius: 16px; overflow: hidden; border: 1px solid var(--stone-200); box-shadow: var(--shadow-lg);
}
.window .bar { height: 34px; display: flex; align-items: center; gap: 7px; padding: 0 14px; background: var(--stone-100); border-bottom: 1px solid var(--stone-200); }
.window .bar i { width: 11px; height: 11px; border-radius: 50%; background: var(--stone-300); display: block; }
.stage .window { width: 86%; margin: 0 auto; }
.float-card {
  position: absolute; background: #fff; border-radius: 18px; overflow: hidden;
  border: 1px solid var(--stone-200); box-shadow: var(--shadow-lg);
}
.stage .quiz { left: 0; bottom: 34px; width: 36%; }
.phone {
  position: absolute; right: 0; bottom: 20px; width: 19%;
  border-radius: 34px; padding: 8px; background: var(--stone-900); box-shadow: var(--shadow-lg);
}
.phone img { border-radius: 27px; }

/* ---------- Sections ---------- */
.section { padding: 112px 0; }
.section-alt { background: var(--paper); border-top: 1px solid var(--sand); border-bottom: 1px solid var(--sand); }
.section-head { max-width: 760px; margin-bottom: 56px; }
.section-head.center { text-align: center; margin-left: auto; margin-right: auto; }
.kicker { display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--amber-ink); margin-bottom: 14px; }
html[lang="zh-CN"] .kicker { letter-spacing: .2em; }
.section h2 { font-family: var(--serif); font-size: clamp(30px, 3.6vw, 44px); line-height: 1.25; letter-spacing: .01em; }
html[lang="en"] .section h2 { letter-spacing: -.005em; line-height: 1.15; }
.section-head p { margin-top: 18px; font-size: 18px; color: var(--stone-600); }

/* Story */
.story { display: grid; grid-template-columns: 300px 1fr; gap: 72px; align-items: center; }
.story-mark {
  aspect-ratio: 1; border-radius: 32px; display: grid; place-items: center;
  background:
    radial-gradient(160px 160px at 30% 25%, rgba(242, 180, 92, .35), transparent 70%),
    radial-gradient(180px 180px at 80% 85%, rgba(247, 211, 161, .5), transparent 70%), var(--sand);
}
.story-mark img { width: 58%; height: auto; filter: drop-shadow(0 18px 28px rgba(28, 25, 23, .22)) drop-shadow(0 3px 6px rgba(28, 25, 23, .10)); }
.story h2 { margin-bottom: 26px; }
.story blockquote { margin: 0; }
.story blockquote p {
  font-family: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", "Noto Serif SC", Georgia, serif;
  font-size: clamp(20px, 2.1vw, 24px); line-height: 1.8; color: var(--stone-800); letter-spacing: .01em;
}
/* Fraunces only ships one heavy weight; long English prose reads better in a book serif */
html[lang="en"] .story blockquote p {
  font-family: Palatino, "Palatino Linotype", "Book Antiqua", Georgia, serif;
  font-size: clamp(19px, 1.9vw, 22px); line-height: 1.6; letter-spacing: 0;
}
.story blockquote p + p { margin-top: 18px; }
.story .sign { margin-top: 26px; display: flex; align-items: center; gap: 12px; font-size: 15px; color: var(--stone-500); }
.story .sign::before { content: ''; width: 28px; height: 1.5px; background: var(--stone-300); }

/* Learning loop */
.loop { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.step {
  background: #fff; border: 1px solid var(--stone-200); border-radius: var(--radius); padding: 28px 28px 0;
  display: flex; flex-direction: column; overflow: hidden; box-shadow: var(--shadow-sm);
}
.step-n { display: flex; align-items: center; gap: 12px; font-size: 14px; color: var(--stone-500); }
.step-n b { width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; font-size: 14px; background: var(--stone-900); color: var(--cream); font-weight: 600; }
.step-wide .step-n b { background: var(--amber); color: var(--stone-900); }
.step h3 { margin-top: 18px; font-size: 22px; line-height: 1.35; }
.step p { margin-top: 8px; font-size: 15.5px; color: var(--stone-600); line-height: 1.7; }
.step-shot {
  margin: 26px -28px 0; padding: 22px 22px 0; background: var(--paper); border-top: 1px solid var(--stone-200); flex: 1;
  display: flex; align-items: flex-end;
}
.step-wide { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1.2fr; column-gap: 56px; align-items: center; }
.step-wide .step-shot { grid-column: 1 / -1; padding-bottom: 22px; }
.step-wide .step-shot img { border-radius: 14px; border-bottom: 1px solid var(--stone-200); box-shadow: var(--shadow-sm); }

/* Review timeline (intervals mirror the app's defaults: 1 -> 3 -> 8 -> 22 days on consecutive correct answers) */
.timeline { margin: 0; padding: 8px 0 0; }
.track { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(5, 1fr); position: relative; }
.track::before {
  content: ''; position: absolute; left: 10%; right: 10%; top: 8px; height: 2px;
  background: linear-gradient(90deg, var(--stone-900), var(--amber) 30%, var(--peach));
}
.track li { position: relative; text-align: center; padding-top: 30px; display: flex; flex-direction: column; gap: 2px; }
.track li::before {
  content: ''; position: absolute; top: 0; left: 50%; width: 18px; height: 18px; margin-left: -9px; border-radius: 50%;
  background: #fff; border: 3px solid var(--amber); box-sizing: border-box;
}
.track li.now::before { background: var(--stone-900); border-color: var(--stone-900); }
.track b { font-size: 15px; color: var(--stone-900); font-weight: 600; white-space: nowrap; }
.track span { font-size: 13px; color: var(--stone-500); }
.timeline figcaption { margin-top: 16px; text-align: center; font-size: 13px; color: var(--stone-500); }

.step-shot img { border-radius: 14px 14px 0 0; border: 1px solid var(--stone-200); border-bottom: 0; box-shadow: 0 -4px 24px rgba(28, 25, 23, .06); width: 100%; }

.loop-facts { list-style: none; margin-top: 40px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.loop-facts li { padding: 4px 0 4px 18px; border-left: 2px solid var(--amber-soft); display: flex; flex-direction: column; }
.loop-facts b { color: var(--stone-900); font-weight: 600; font-size: 16px; }
.loop-facts span { color: var(--stone-600); font-size: 15px; }

/* Feature rows */
.feature-row { display: grid; grid-template-columns: 5fr 7fr; gap: 64px; align-items: center; }
.feature-row + .feature-row { margin-top: 104px; }
.feature-row.flip { grid-template-columns: 7fr 5fr; }
.feature-row.flip .feature-text { order: 2; }
.feature-text h3 { font-family: var(--serif); font-size: clamp(26px, 2.8vw, 34px); line-height: 1.3; }
html[lang="en"] .feature-text h3 { letter-spacing: -.005em; line-height: 1.2; }
.feature-text > p { margin-top: 16px; color: var(--stone-600); }
.checks { list-style: none; margin-top: 24px; display: grid; gap: 12px; }
.checks li { display: flex; gap: 12px; align-items: flex-start; color: var(--stone-700); font-size: 16px; line-height: 1.65; }
.checks li::before {
  content: ''; flex: none; width: 20px; height: 20px; margin-top: 3px; border-radius: 50%;
  background: var(--amber-wash) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M6 10.5l2.6 2.6L14 7.6' fill='none' stroke='%238A4F0C' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 20px no-repeat;
}
.checks b { color: var(--stone-900); font-weight: 600; }

.phones { display: flex; gap: 22px; justify-content: center; align-items: flex-end; }
.phones .phone { position: static; width: 42%; max-width: 250px; }
.phones .phone:first-child { transform: translateY(-28px); }

/* Privacy (dark) */
.section-dark { background: var(--stone-900); color: var(--stone-300); position: relative; overflow: hidden; }
.section-dark::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(600px 360px at 90% 0%, rgba(242, 180, 92, .14), transparent 70%);
}
.section-dark .wrap { position: relative; }
.section-dark h2, .section-dark h3 { color: var(--cream); }
.section-dark .kicker { color: var(--amber-soft); }
.section-dark .section-head p { color: var(--stone-400); }
.privacy-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.p-card { border: 1px solid rgba(255, 252, 249, .12); background: rgba(255, 252, 249, .04); border-radius: var(--radius); padding: 26px; }
.p-card .icon { width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; background: rgba(242, 180, 92, .14); color: var(--amber-soft); }
.p-card .icon svg { width: 22px; height: 22px; }
.p-card h3 { margin-top: 18px; font-size: 18px; }
.p-card p { margin-top: 8px; font-size: 15px; line-height: 1.7; color: var(--stone-400); }
.data-flow { margin-top: 56px; display: grid; grid-template-columns: 1.15fr 1fr; gap: 40px; align-items: center; }
.data-table { width: 100%; border-collapse: collapse; font-size: 15px; }
.data-table caption { text-align: left; color: var(--cream); font-weight: 600; font-size: 18px; margin-bottom: 14px; }
.data-table th, .data-table td { text-align: left; vertical-align: top; padding: 14px 0; border-bottom: 1px solid rgba(255, 252, 249, .1); line-height: 1.6; }
.data-table th { color: var(--stone-200); font-weight: 600; width: 38%; padding-right: 20px; }
.data-table td { color: var(--stone-400); }
.data-note { margin-top: 18px; font-size: 14px; line-height: 1.7; color: var(--stone-400); }
.data-flow .window { border-color: rgba(255, 252, 249, .1); box-shadow: 0 30px 80px rgba(0, 0, 0, .4); }

/* Models */
.models { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.model { background: #fff; border: 1px solid var(--stone-200); border-radius: var(--radius); padding: 24px; display: flex; flex-direction: column; box-shadow: var(--shadow-sm); }
.model h3 { font-size: 18px; }
.model .vendor { font-size: 13px; color: var(--stone-500); margin-top: 2px; }
.model ul { list-style: none; margin-top: 16px; display: flex; flex-wrap: wrap; gap: 6px; }
.model li { font-size: 13px; padding: 3px 10px; border-radius: 8px; background: var(--stone-100); color: var(--stone-700); }
.model a { margin-top: auto; padding-top: 20px; font-size: 14px; color: var(--amber-ink); text-decoration: none; font-weight: 600; }
.model a:hover { text-decoration: underline; }
.models-note { margin-top: 24px; font-size: 15px; color: var(--stone-500); text-align: center; }

/* FAQ */
.faq { max-width: 820px; margin: 0 auto; }
.faq details { border-bottom: 1px solid var(--stone-200); }
.faq details:first-child { border-top: 1px solid var(--stone-200); }
.faq summary {
  list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 20px;
  padding: 22px 4px; font-size: 18px; font-weight: 600; color: var(--stone-900);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ''; flex: none; width: 12px; height: 12px; margin-right: 6px;
  border-right: 2px solid var(--stone-500); border-bottom: 2px solid var(--stone-500);
  transform: translateY(-3px) rotate(45deg); transition: transform .25s var(--ease);
}
.faq details[open] summary::after { transform: translateY(3px) rotate(-135deg); }
.faq details p { padding: 0 4px 24px; color: var(--stone-600); max-width: 720px; }
.faq code { font-size: .9em; background: var(--stone-100); padding: 1px 6px; border-radius: 6px; }

/* Two pillars (bottom of the hero) */
.pillars { max-width: 1080px; margin: 0 auto; padding-bottom: 88px; display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.pillar {
  display: flex; flex-direction: column; text-decoration: none; color: inherit; background: #fff;
  border: 1px solid var(--stone-200); border-radius: var(--radius); padding: 28px 30px; box-shadow: var(--shadow-sm);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-color .2s;
}
.pillar:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--stone-300); }
.pillar .kicker { margin-bottom: 8px; }
.pillar h3 { font-family: var(--serif); font-size: 24px; line-height: 1.35; color: var(--stone-900); }
.pillar p { margin-top: 8px; font-size: 15.5px; line-height: 1.7; color: var(--stone-600); }
.pillar .more { margin-top: auto; padding-top: 16px; font-size: 14px; font-weight: 600; color: var(--amber-ink); }

/* Paper study: seven-step flow, screenshots, honest note */
.flow { list-style: none; padding: 0; margin: 0 0 40px; display: grid; grid-template-columns: repeat(7, 1fr); gap: 12px; }
.flow li { position: relative; background: #fff; border: 1px solid var(--stone-200); border-radius: 14px; padding: 14px 14px 16px; box-shadow: var(--shadow-sm); }
/* chevron between steps, sitting in the grid gap */
.flow li:not(:last-child)::after {
  content: ''; position: absolute; right: -10px; top: 24px; width: 7px; height: 7px; z-index: 1;
  border-top: 1.5px solid var(--stone-400); border-right: 1.5px solid var(--stone-400); transform: rotate(45deg);
}
.flow b { display: flex; align-items: center; gap: 8px; font-size: 16px; font-weight: 600; color: var(--stone-900); }
.flow b i { font-style: normal; flex: none; width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; font-size: 12px; background: var(--amber-wash); color: var(--amber-ink); }
.flow span { display: block; margin-top: 6px; font-size: 13px; line-height: 1.55; color: var(--stone-600); }
.paper-grid { margin-top: 24px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.paper-card { margin: 0; display: flex; flex-direction: column; background: #fff; border: 1px solid var(--stone-200); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.paper-card img { width: 100%; border-bottom: 1px solid var(--stone-200); }
.paper-card figcaption { padding: 20px 22px 24px; }
.paper-card h3 { font-size: 18px; color: var(--stone-900); }
.paper-card p { margin-top: 6px; font-size: 15px; line-height: 1.7; color: var(--stone-600); }
.paper-more { padding: 24px 24px 26px; background: var(--amber-wash); border-color: #F6E3C6; }
.paper-more .checks { margin-top: 14px; gap: 10px; }
.paper-more .checks li { font-size: 15px; line-height: 1.6; }
.paper-note { margin: 28px auto 0; max-width: 920px; text-align: center; font-size: 14px; line-height: 1.7; color: var(--stone-500); }

/* Closing CTA */
.closing { padding-top: 0; padding-bottom: 96px; }
.closing-card {
  border-radius: 32px; padding: 72px 40px; text-align: center; position: relative; overflow: hidden;
  background:
    radial-gradient(520px 300px at 0% 0%, rgba(242, 180, 92, .28), transparent 70%),
    radial-gradient(520px 320px at 100% 100%, rgba(247, 211, 161, .4), transparent 70%), var(--sand);
}
.closing-card h2 { font-family: var(--serif); font-size: clamp(28px, 3.4vw, 42px); line-height: 1.3; }
.closing-card p { margin: 16px auto 0; max-width: 560px; color: var(--stone-600); }
/* the moon rabbit sits at the bottom edge of the card reading its book, body tucked below the edge */
.closing-card > :not(.closing-rabbit) { position: relative; z-index: 1; }
.closing-rabbit { position: absolute; right: 7%; bottom: -16px; width: 156px; height: auto; pointer-events: none; }

/* Footer */
.site-footer { border-top: 1px solid var(--stone-200); padding: 56px 0 44px; font-size: 15px; color: var(--stone-500); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; }
.footer-grid h3 { font-size: 13px; letter-spacing: .12em; text-transform: uppercase; color: var(--stone-700); margin-bottom: 14px; }
.footer-grid ul { list-style: none; display: grid; gap: 8px; }
.footer-grid a { text-decoration: none; color: var(--stone-600); }
.footer-grid a:hover { color: var(--stone-900); text-decoration: underline; }
.footer-about p { margin-top: 14px; max-width: 360px; line-height: 1.7; }
.footer-bottom { margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--stone-200); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 14px; }

/* ---------- Motion (subtle, opt-out aware) ---------- */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .js .reveal { opacity: 1; transform: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .nav { display: none; }
  .privacy-grid, .models { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(4, 1fr); }
  .flow li::after { display: none; }
  .paper-grid { grid-template-columns: 1fr 1fr; }
  .paper-more { grid-column: 1 / -1; }
}
@media (max-width: 900px) {
  .section { padding: 84px 0; }
  .loop { grid-template-columns: 1fr; max-width: 560px; margin: 0 auto; }
  .step-wide { grid-template-columns: 1fr; }
  .loop-facts { grid-template-columns: 1fr; max-width: 560px; margin-left: auto; margin-right: auto; gap: 16px; }
  .timeline { margin-top: 28px; }
  .feature-row, .feature-row.flip { grid-template-columns: 1fr; gap: 36px; }
  .feature-row.flip .feature-text { order: 0; }
  .feature-row + .feature-row { margin-top: 80px; }
  .story { grid-template-columns: 1fr; gap: 36px; }
  .story-mark { width: 160px; border-radius: 28px; }
  .closing-card { padding-bottom: 200px; }
  .closing-rabbit { right: auto; left: 50%; width: 132px; transform: translateX(-50%); }
  .data-flow { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-about { grid-column: 1 / -1; }
  .paper-grid { grid-template-columns: 1fr; max-width: 560px; margin-left: auto; margin-right: auto; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .wrap { padding: 0 20px; }
  .site-header .wrap { height: 60px; gap: 12px; }
  .brand .en { font-size: 21px; }
  .brand img { width: 32px; height: 32px; }
  .header-actions .btn { display: none; }
  .hero { padding-top: 52px; }
  .hero h1 { margin-top: 20px; }
  .cta-row .btn { flex: 1 1 100%; }
  .stage { margin-top: 150px; padding-bottom: 150px; }
  .stage-rabbit { right: auto; left: 50%; width: 112px; transform: translate(-50%, -90%); }
  .stage .window { width: 100%; }
  .window .bar { height: 22px; padding: 0 10px; gap: 5px; }
  .window .bar i { width: 7px; height: 7px; }
  .stage .quiz { width: 66%; left: 4%; bottom: 16px; border-radius: 14px; }
  .stage .phone { width: 31%; right: 4%; bottom: 0; border-radius: 22px; padding: 5px; }
  .stage .phone img { border-radius: 18px; }
  .section { padding: 72px 0; }
  .section-head { margin-bottom: 40px; }
  .section-head p { font-size: 16.5px; }
  .privacy-grid { grid-template-columns: 1fr; gap: 12px; }
  .p-card { display: grid; grid-template-columns: 42px 1fr; column-gap: 16px; padding: 20px; }
  .p-card .icon { grid-row: span 2; }
  .p-card h3 { margin-top: 0; }
  .p-card p { margin-top: 4px; }
  .models { grid-template-columns: 1fr 1fr; gap: 12px; }
  .model { padding: 18px 16px; }
  .model ul { margin-top: 12px; }
  .model li { font-size: 12px; padding: 2px 8px; }
  .step { padding: 24px 22px 0; }
  .step-shot { margin: 22px -22px 0; padding: 16px 16px 0; }
  .faq summary { font-size: 16.5px; padding: 18px 2px; }
  .track b { font-size: 13px; white-space: normal; line-height: 1.3; }
  .track span { font-size: 12px; }
  .pillars { grid-template-columns: 1fr; gap: 14px; padding-bottom: 60px; }
  .pillar { padding: 22px 22px 24px; }
  .pillar h3 { font-size: 21px; }
  .flow { grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 28px; }
  .flow li:last-child { grid-column: 1 / -1; }
  .flow li { padding: 12px 12px 14px; }
  .closing { padding-bottom: 72px; }
  .closing-card { padding: 52px 18px 168px; border-radius: 24px; }
  .closing-rabbit { right: auto; left: 50%; width: 118px; transform: translateX(-50%); }
  .closing-card h2 { font-size: 25px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
}