:root {
  --paper: #f3f0eb;
  --paper-deep: #e8e1d8;
  --ink: #4a403d;
  --ink-soft: #6d615d;
  --line: rgba(74, 64, 61, 0.2);
  --white: #fffefa;
  --sage: #889082;
  --sage-light: #d8ddd2;
  --shadow: 0 28px 70px rgba(67, 55, 51, 0.14);
  --radius: 28px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--paper) url("assets/paper-texture.webp") center top / 760px auto repeat;
  font-family: "Noto Serif SC", "Songti SC", "STSong", "Microsoft YaHei", serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
.shell { width: min(1120px, calc(100% - 40px)); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 100; padding: 10px 16px; background: var(--ink); color: white; border-radius: 8px; }
.skip-link:focus { top: 16px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(243, 240, 235, 0.86);
  border-bottom: 1px solid rgba(74, 64, 61, 0.1);
  backdrop-filter: blur(14px);
}
.nav-wrap { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .04em; }
.brand-mark { width: 32px; height: 28px; display: grid; place-items: center; border: 2px solid var(--ink); border-radius: 45% 48% 40% 44%; font-family: sans-serif; transform: rotate(-3deg); }
nav { display: flex; gap: 30px; font-family: system-ui, sans-serif; font-size: 14px; }
nav a { position: relative; }
nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -6px; height: 2px; background: var(--ink); transition: right .2s ease; }
nav a:hover::after, nav a:focus-visible::after { right: 0; }

.hero { min-height: calc(100vh - 74px); display: grid; align-items: center; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.02fr .98fr; align-items: center; gap: 70px; padding-block: 70px 88px; }
.eyebrow { margin: 0 0 12px; font: 700 13px/1.3 system-ui, sans-serif; letter-spacing: .22em; text-transform: uppercase; color: var(--sage); }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 28px; font-size: clamp(52px, 7vw, 86px); line-height: 1.08; letter-spacing: -.04em; font-weight: 700; }
h1 em { color: var(--sage); font-style: normal; position: relative; white-space: nowrap; }
h1 em::after { content: ""; position: absolute; left: 1%; right: -2%; bottom: -5px; height: 9px; border-bottom: 3px solid var(--sage); border-radius: 50%; transform: rotate(-1.5deg); }
h2 { max-width: 720px; margin-bottom: 22px; font-size: clamp(34px, 4vw, 54px); line-height: 1.18; letter-spacing: -.03em; }
h3 { margin-bottom: 12px; font-size: 23px; line-height: 1.3; }
.hero-intro { max-width: 610px; margin-bottom: 32px; color: var(--ink-soft); font-size: 18px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 18px 24px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 12px; min-height: 52px; padding: 0 25px; border: 2px solid var(--ink); border-radius: 999px; font: 700 15px/1 system-ui, sans-serif; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.button:hover, .button:focus-visible { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(74, 64, 61, .15); }
.button-primary { background: var(--ink); color: var(--white); }
.button-outline { background: transparent; white-space: nowrap; }
.download-badge-wrap { position: relative; }
.store-badge { width: 204px; min-height: 66px; padding: 9px 18px; display: flex; align-items: center; gap: 13px; color: #fff; background: #211f20; border: 1px solid rgba(255,255,255,.12); border-radius: 17px; font-family: Arial, "Microsoft YaHei", sans-serif; box-shadow: 0 10px 24px rgba(33,31,32,.12); transition: transform .2s ease, box-shadow .2s ease; }
.store-badge:hover, .store-badge:focus-visible { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(33,31,32,.22); }
.store-badge__icon { width: 43px; height: 43px; flex: 0 0 43px; fill: currentColor; }
.store-badge__icon--apple { transform: translateY(-1px); }
.store-badge__copy { min-width: 0; display: flex; flex-direction: column; align-items: flex-start; line-height: 1; white-space: nowrap; }
.store-badge__copy small { margin-bottom: 5px; font-size: 12px; font-weight: 400; letter-spacing: .01em; }
.store-badge__copy strong { font-size: 21px; font-weight: 700; letter-spacing: -.02em; }
.download-qr { position: absolute; left: 50%; bottom: calc(100% + 16px); z-index: 10; width: 220px; padding: 14px 14px 11px; color: var(--ink-soft); background: var(--white); border: 1px solid rgba(74,64,61,.12); border-radius: 18px; box-shadow: 0 18px 42px rgba(51,43,40,.22); text-align: center; font: 14px/1.4 system-ui, sans-serif; opacity: 0; visibility: hidden; pointer-events: none; transform: translate(-50%, 8px); transition: opacity .18s ease, transform .18s ease, visibility .18s ease; }
.download-qr::after { content: ""; position: absolute; left: 50%; bottom: -8px; width: 16px; height: 16px; background: var(--white); border-right: 1px solid rgba(74,64,61,.12); border-bottom: 1px solid rgba(74,64,61,.12); transform: translateX(-50%) rotate(45deg); }
.download-qr img { width: 100%; height: auto; margin-bottom: 8px; image-rendering: pixelated; }
.download-badge-wrap:hover .download-qr, .download-badge-wrap:focus-within .download-qr { opacity: 1; visibility: visible; transform: translate(-50%, 0); }
.trust-list { display: flex; flex-wrap: wrap; gap: 10px 24px; margin: 32px 0 0; padding: 0; list-style: none; color: var(--ink-soft); font: 13px/1.4 system-ui, sans-serif; }
.trust-list li::before { content: "✓"; margin-right: 7px; color: var(--sage); font-weight: 800; }

.hero-art { position: relative; min-height: 670px; display: grid; place-items: center; }
.hero-phone-shot { position: relative; z-index: 2; width: min(390px, 82vw); filter: drop-shadow(0 28px 38px rgba(67, 55, 51, .2)); transform: rotate(1.5deg); }
.hero-phone-shot img { width: 100%; border-radius: 28px; }
.moon { position: absolute; right: 5%; top: 4%; width: 310px; height: 310px; background: var(--sage-light); border-radius: 50%; opacity: .85; }
.sound-note { position: absolute; z-index: 4; display: grid; place-items: center; width: 70px; height: 70px; border: 2px solid var(--ink); border-radius: 44% 52% 46% 48%; background: var(--paper); font: 36px/1 Georgia, serif; box-shadow: 0 12px 25px rgba(74,64,61,.1); }
.sound-note-one { top: 22%; left: 2%; transform: rotate(-8deg); }
.sound-note-two { right: 0; bottom: 12%; transform: rotate(8deg); }

.section { padding-block: 120px; border-top: 1px solid var(--line); }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 50px; }
.feature-card { position: relative; min-height: 320px; padding: 32px; overflow: hidden; background: rgba(255,254,250,.58); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 15px 45px rgba(74,64,61,.06); }
.feature-card p { color: var(--ink-soft); }
.card-number { position: absolute; right: 24px; top: 18px; color: rgba(74,64,61,.18); font: 800 42px/1 system-ui, sans-serif; }
.feature-icon { width: 72px; height: 72px; display: grid; place-items: center; margin-bottom: 42px; border: 2px solid var(--ink); border-radius: 45% 48% 43% 51%; background: var(--sage-light); font: 700 34px/1 sans-serif; transform: rotate(-2deg); }

.sound-section { background: rgba(74,64,61,.94); color: var(--paper); }
.sound-section .eyebrow { color: #bdc5b6; }
.sound-grid, .cd-grid { display: grid; grid-template-columns: 1fr 430px; gap: 90px; align-items: center; }
.sound-copy > p:not(.eyebrow) { max-width: 620px; color: rgba(255,255,255,.72); font-size: 18px; }
.sound-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.sound-chips span { padding: 8px 16px; border: 1px solid rgba(255,255,255,.28); border-radius: 999px; color: rgba(255,255,255,.82); font: 14px/1.4 system-ui, sans-serif; }
.screen-card { margin: 0; padding: 0 0 20px; background: var(--paper-deep); border-radius: 30px; box-shadow: 0 30px 70px rgba(0,0,0,.25); overflow: hidden; transform: rotate(1.4deg); }
.screen-card img { width: 100%; height: auto; object-fit: contain; }
.screen-card figcaption { padding-top: 15px; color: var(--ink-soft); text-align: center; font-size: 13px; }
.cd-grid { grid-template-columns: 390px 1fr; }
.screen-card-small { transform: rotate(-1.5deg); background: var(--white); }
.screen-card-small img { width: 100%; height: auto; }
.large-copy { max-width: 650px; color: var(--ink-soft); font-size: 18px; }
.quote-card { position: relative; margin-top: 38px; padding: 30px 34px; background: var(--sage-light); border-radius: 22px 28px 24px 30px; }
.quote-card span { position: absolute; right: 24px; top: 4px; color: rgba(74,64,61,.2); font-size: 70px; line-height: 1; }
.quote-card p { margin: 0; font-size: 19px; }

.privacy-callout { padding-block: 90px; }
.privacy-box { display: flex; align-items: center; justify-content: space-between; gap: 50px; padding: 55px 62px; background: rgba(216,221,210,.78); border: 1px solid rgba(74,64,61,.16); border-radius: 38px 32px 42px 36px; }
.privacy-box h2 { max-width: 700px; font-size: clamp(30px, 4vw, 47px); }
.privacy-box p:last-child { max-width: 760px; margin-bottom: 0; color: var(--ink-soft); }

.site-footer { padding: 65px 0 28px; color: var(--paper); background: var(--ink); }
.footer-grid { display: flex; justify-content: space-between; gap: 40px; padding-bottom: 50px; }
.footer-brand { margin-bottom: 14px; }
.footer-grid p { color: rgba(255,255,255,.62); }
.footer-links { display: flex; align-items: flex-start; gap: 28px; font: 14px/1.5 system-ui, sans-serif; }
.copyright { padding-top: 20px; border-top: 1px solid rgba(255,255,255,.14); color: rgba(255,255,255,.5); font: 12px/1.5 system-ui, sans-serif; }

.policy-main { min-height: 80vh; }
.policy-hero { padding: 85px 0 135px; color: var(--paper); background: var(--ink); }
.policy-heading h1 { margin-bottom: 20px; font-size: clamp(48px, 8vw, 82px); }
.policy-heading > p:last-child { color: rgba(255,255,255,.62); font-size: 14px; }
.policy-card { position: relative; z-index: 2; margin-top: -70px; margin-bottom: 100px; padding: 64px clamp(28px, 7vw, 88px); background: rgba(255,254,250,.93); border: 1px solid var(--line); border-radius: 34px; box-shadow: var(--shadow); }
.policy-lead { margin-bottom: 50px; padding-bottom: 36px; border-bottom: 1px solid var(--line); color: var(--ink-soft); font-size: 18px; }
.policy-card section { margin-top: 48px; }
.policy-card h2 { margin-bottom: 18px; font-size: 28px; }
.policy-card h3 { margin-top: 26px; margin-bottom: 8px; font-size: 18px; }
.policy-card p { color: var(--ink-soft); }
.policy-note { margin-top: 50px; padding: 24px 28px; background: var(--sage-light); border-left: 4px solid var(--sage); border-radius: 6px 20px 20px 6px; }
.policy-note p { margin: 6px 0 0; }
.back-home { display: inline-block; margin-top: 44px; font-weight: 700; border-bottom: 1px solid var(--ink); }
.compact-footer { padding-top: 26px; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 25px; padding-top: 65px; }
  .hero-copy { text-align: center; }
  .hero-intro { margin-inline: auto; }
  .hero-actions, .trust-list { justify-content: center; }
  .hero-art { min-height: 620px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { min-height: auto; }
  .sound-grid, .cd-grid { grid-template-columns: 1fr; gap: 55px; }
  .screen-card { width: min(430px, 100%); margin-inline: auto; }
  .cd-grid > figure { order: 2; }
  .privacy-box { display: block; padding: 44px 34px; }
  .privacy-box .button { margin-top: 28px; }
}

@media (max-width: 620px) {
  .shell { width: min(100% - 26px, 1120px); }
  .nav-wrap { min-height: 66px; }
  nav { gap: 14px; font-size: 13px; }
  nav a:first-child { display: none; }
  .brand { font-size: 15px; }
  .hero-grid { padding-top: 52px; }
  h1 { font-size: clamp(42px, 12vw, 54px); }
  h1 em { white-space: normal; }
  .hero-copy { min-width: 0; }
  .hero-intro { max-width: 100%; padding-inline: 8px; font-size: 15px; }
  .hero-actions { flex-direction: column; }
  .download-badge-wrap, .store-badge { width: min(260px, 100%); }
  .trust-list { flex-direction: column; gap: 8px; }
  h2 { font-size: 34px; }
  .hero-art { min-height: 570px; }
  .hero-phone-shot { width: min(310px, 82vw); }
  .hero-phone-shot img { border-radius: 22px; }
  .moon { width: 230px; height: 230px; right: 0; }
  .sound-note { width: 58px; height: 58px; }
  .section { padding-block: 82px; }
  .feature-grid { margin-top: 34px; }
  .feature-card { padding: 28px; }
  .privacy-callout { padding-block: 65px; }
  .privacy-box { padding: 38px 26px; border-radius: 28px; }
  .footer-grid { display: block; }
  .footer-links { margin-top: 34px; }
  .policy-hero { padding: 60px 0 115px; }
  .policy-card { padding: 42px 24px; border-radius: 25px; margin-bottom: 70px; }
  .policy-card h2 { font-size: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}