:root {
  color-scheme: light;
  --bg: #f7f6fb; --surface: #ffffff; --surface-2: #f0eff5; --ink: #23242d; --muted: #6f7180;
  --line: #dfdee8; --pink: #f3a6c1; --pink-soft: #fff0f5; --blue: #a9ddec; --blue-deep: #24718d;
  --mint: #83d6c7; --mint-soft: #eaf9f5; --yellow: #f2c96d; --yellow-soft: #fff8e6; --lavender: #aa9ade;
  --shadow: 0 24px 70px rgba(55, 45, 82, .11); --radius: 22px; --shell: 1120px;
}
[data-theme="dark"] {
  color-scheme: dark; --bg: #1d1e24; --surface: #272830; --surface-2: #22232a; --ink: #f7f5fb; --muted: #bab8c5;
  --line: #3b3c47; --pink-soft: #472f39; --mint-soft: #273d39; --yellow-soft: #443d27; --blue-deep: #9edbec;
  --shadow: 0 24px 70px rgba(0, 0, 0, .28);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: "Segoe UI Variable", "Segoe UI", "Microsoft YaHei UI", sans-serif; line-height: 1.65; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, a { -webkit-tap-highlight-color: transparent; }
.shell { width: min(var(--shell), calc(100% - 40px)); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -80px; background: var(--ink); color: var(--bg); padding: 10px 16px; z-index: 100; border-radius: 10px; }
.skip-link:focus { top: 12px; }
.site-header { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 88%, transparent); border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent); backdrop-filter: blur(18px); }
.nav { height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-size: 20px; font-weight: 750; letter-spacing: -.02em; }
.brand img { border-radius: 12px; }
.nav-links { display: flex; align-items: center; gap: 30px; margin-left: auto; font-size: 14px; color: var(--muted); }
.nav-links a { transition: color .2s ease; }
.nav-links a:hover { color: var(--ink); }
.theme-toggle { width: 42px; height: 42px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); color: var(--ink); cursor: pointer; }
.theme-toggle svg { width: 20px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.theme-toggle .moon { stroke-width: .5; }
.theme-toggle .sun, [data-theme="dark"] .theme-toggle .moon { display: none; }
[data-theme="dark"] .theme-toggle .sun { display: block; }
.hero { min-height: 690px; display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 60px; padding-block: 82px 96px; }
.eyebrow, .kicker { color: var(--blue-deep); font-size: 13px; font-weight: 700; letter-spacing: .08em; }
.eyebrow { display: flex; align-items: center; gap: 9px; }
.eyebrow span { width: 9px; height: 9px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 0 5px var(--mint-soft); }
h1, h2, h3, p { margin-top: 0; }
h1 { margin: 20px 0 24px; font-size: clamp(50px, 6vw, 78px); line-height: 1.1; letter-spacing: -.055em; font-weight: 760; }
h1 em { color: var(--blue-deep); font-style: normal; }
.hero-lead { max-width: 560px; color: var(--muted); font-size: 19px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 32px 0 22px; }
.button { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; padding: 0 20px; border-radius: 13px; font-size: 14px; font-weight: 700; border: 1px solid var(--line); transition: transform .18s ease, box-shadow .18s ease, background .18s ease; }
.button:hover { transform: translateY(-2px); }
.button.primary { color: #143440; background: var(--blue); border-color: color-mix(in srgb, var(--blue) 75%, #000); box-shadow: 0 10px 24px rgba(101, 179, 204, .2); }
.button.quiet { background: var(--surface); }
.button.large { min-height: 52px; padding-inline: 26px; }
.release-note { display: flex; flex-wrap: wrap; gap: 8px; }
.release-note span, .release-note a { padding: 5px 10px; background: var(--surface-2); color: var(--muted); border-radius: 999px; font-size: 12px; text-decoration: none; }
.release-note a:hover { color: var(--pink-deep); }
.hero-art { position: relative; min-height: 490px; display: grid; place-items: center; }
.art-card { width: min(410px, 78vw); aspect-ratio: 1; padding: 24px; background: var(--surface); border: 1px solid var(--line); border-radius: 34px; box-shadow: var(--shadow); transform: rotate(2deg); }
.art-card img { width: 100%; height: 100%; object-fit: cover; border-radius: 25px; }
.bubble { position: absolute; border-radius: 50%; border: 5px solid var(--bg); }
.bubble-a { width: 52px; height: 52px; right: 8%; top: 3%; background: var(--lavender); }
.bubble-b { width: 34px; height: 34px; left: 8%; bottom: 10%; background: var(--yellow); }
.bubble-c { width: 24px; height: 24px; right: 2%; bottom: 26%; background: var(--mint); }
.mini-card { position: absolute; min-width: 178px; padding: 14px 16px; border-radius: 16px; border: 1px solid var(--line); box-shadow: 0 14px 36px rgba(36, 37, 47, .12); backdrop-filter: blur(8px); }
.mini-card b, .mini-card span { display: block; font-size: 12px; color: var(--muted); }
.mini-card strong { display: block; margin-top: 4px; font-size: 18px; }
.mini-pink { left: -2%; top: 19%; background: color-mix(in srgb, var(--pink-soft) 92%, transparent); }
.mini-mint { right: -1%; bottom: 11%; background: color-mix(in srgb, var(--mint-soft) 92%, transparent); }
.trust-strip { background: var(--surface); border-block: 1px solid var(--line); }
.trust-grid { min-height: 72px; display: grid; grid-template-columns: repeat(4, 1fr); align-items: center; text-align: center; color: var(--muted); font-size: 13px; }
.trust-grid span::first-letter { color: var(--mint); }
.section { padding-block: 112px; }
.section-heading { max-width: 660px; margin: 0 auto 46px; text-align: center; }
.section-heading.compact { margin-bottom: 32px; }
h2 { margin: 10px 0 14px; font-size: clamp(34px, 4vw, 48px); line-height: 1.18; letter-spacing: -.04em; }
.section-heading p, .preview-copy > p, .privacy-copy > p { color: var(--muted); font-size: 17px; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.feature-card { min-height: 280px; padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease; }
.feature-card:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--blue-deep) 28%, var(--line)); box-shadow: 0 18px 42px rgba(55, 45, 82, .08); }
.feature-card.pink { background: var(--pink-soft); }.feature-card.blue { background: color-mix(in srgb, var(--blue) 18%, var(--surface)); }.feature-card.mint { background: var(--mint-soft); }.feature-card.yellow { background: var(--yellow-soft); }.feature-card.lavender { background: color-mix(in srgb, var(--lavender) 17%, var(--surface)); }
.feature-card.reader { border-color: color-mix(in srgb, var(--lavender) 48%, var(--line)); }
.weread-brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); font-weight: 750; }
.weread-brand img, .reading-kicker img { border-radius: 10px; box-shadow: 0 8px 20px rgba(47, 167, 235, .2); }
.feature-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin-bottom: 32px; }
.feature-icon { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 13px; background: color-mix(in srgb, var(--surface) 75%, transparent); font-size: 22px; }
.feature-tag { padding: 4px 9px; border: 1px solid color-mix(in srgb, var(--line) 75%, transparent); border-radius: 999px; background: color-mix(in srgb, var(--surface) 58%, transparent); color: var(--muted); font-size: 11px; line-height: 1.4; white-space: nowrap; }
.feature-card h3 { margin-bottom: 10px; font-size: 19px; }
.feature-card p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
.reading-highlight { display: grid; grid-template-columns: 1.1fr .9fr; align-items: center; gap: 52px; margin-top: 18px; padding: 42px 48px; overflow: hidden; border: 1px solid color-mix(in srgb, var(--lavender) 42%, var(--line)); border-radius: 28px; background: linear-gradient(135deg, color-mix(in srgb, var(--lavender) 15%, var(--surface)), color-mix(in srgb, var(--pink) 12%, var(--surface))); box-shadow: var(--shadow); }
.reading-kicker { display: inline-flex; align-items: center; gap: 9px; }
.reading-copy h3 { margin: 8px 0 12px; font-size: clamp(28px, 3vw, 38px); line-height: 1.2; letter-spacing: -.035em; }
.reading-copy p { margin-bottom: 18px; color: var(--muted); font-size: 16px; }
.privacy-hint { display: inline-flex; padding: 8px 12px; border-radius: 10px; background: color-mix(in srgb, var(--surface) 62%, transparent); color: var(--muted); font-size: 12px; }
.reading-demo { padding: 24px; border: 1px solid color-mix(in srgb, var(--line) 72%, transparent); border-radius: 20px; background: color-mix(in srgb, var(--surface) 88%, transparent); box-shadow: 0 18px 40px rgba(55, 45, 82, .1); }
.reading-demo-head, .reading-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.reading-demo-head { color: var(--ink); font-weight: 720; }
.reading-demo-head small { color: var(--muted); font-weight: 400; }
.reading-demo > strong { display: block; margin: 12px 0 20px; color: var(--blue-deep); font-size: 32px; letter-spacing: -.035em; }
.reading-row { padding: 12px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.reading-row span { display: inline-flex; align-items: center; gap: 8px; }
.reading-row b { color: var(--ink); font-size: 12px; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 0 4px var(--mint-soft); }
.status-dot.local { background: var(--lavender); box-shadow: 0 0 0 4px color-mix(in srgb, var(--lavender) 15%, transparent); }
.preview-section { background: var(--surface-2); border-block: 1px solid var(--line); }
.preview-grid { display: grid; grid-template-columns: .74fr 1.26fr; gap: 58px; align-items: center; }
.check-list { list-style: none; padding: 0; margin: 26px 0 0; display: grid; gap: 11px; }
.check-list li::before { content: "✓"; display: inline-grid; place-items: center; width: 22px; height: 22px; margin-right: 10px; border-radius: 50%; background: var(--mint-soft); color: #2d8877; font-weight: 800; }
.app-frame { margin: 0; overflow: hidden; background: var(--surface); border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow); }
.app-frame img { width: 100%; }
.frame-top { height: 42px; display: flex; align-items: center; padding: 0 15px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.frame-top i { width: 9px; height: 9px; margin-right: 8px; border-radius: 50%; background: var(--pink); }.frame-top b { margin-left: auto; font-weight: 400; letter-spacing: .15em; }
.app-frame figcaption { padding: 10px 15px; color: var(--muted); font-size: 12px; text-align: center; }
.privacy-panel { display: grid; grid-template-columns: .9fr 1.1fr; gap: 54px; padding: 54px; background: var(--surface); border: 1px solid var(--line); border-radius: 28px; box-shadow: var(--shadow); }
.text-link { color: var(--blue-deep); font-weight: 700; }
.privacy-list { display: grid; gap: 13px; }
.privacy-list > div { display: grid; grid-template-columns: 38px 1fr; gap: 12px; padding: 15px; background: var(--surface-2); border-radius: 14px; }
.privacy-list span { width: 32px; height: 32px; display: grid; place-items: center; border-radius: 10px; background: var(--mint-soft); color: #2f8b7a; font-weight: 800; }
.privacy-list p { margin: 0; color: var(--muted); font-size: 14px; }.privacy-list b { color: var(--ink); }
code { padding: 2px 6px; border-radius: 6px; background: var(--surface-2); font-family: Consolas, monospace; font-size: .9em; }
.faq-list { max-width: 800px; margin: auto; border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); }
summary { display: flex; justify-content: space-between; gap: 20px; padding: 22px 4px; cursor: pointer; list-style: none; font-weight: 650; }
summary::-webkit-details-marker { display: none; } summary span { color: var(--muted); font-size: 20px; transition: transform .2s; } details[open] summary span { transform: rotate(45deg); }
details p { max-width: 700px; padding: 0 4px 22px; margin: 0; color: var(--muted); }
.contact-panel { display: grid; grid-template-columns: 1.2fr .8fr; overflow: hidden; border: 1px solid var(--line); border-radius: 28px; background: var(--surface); box-shadow: var(--shadow); }
.letter { padding: 52px; background: var(--pink-soft); font-family: "Microsoft YaHei", "Microsoft YaHei UI", sans-serif; }.letter span { color: var(--muted); font-size: 13px; }.letter p { margin: 20px 0; font-size: clamp(20px, 2.5vw, 29px); font-weight: 500; line-height: 1.65; letter-spacing: .01em; }.letter strong { color: color-mix(in srgb, var(--pink) 75%, var(--ink)); }
.contact-actions { padding: 52px 42px; }.contact-actions h2 { font-size: 30px; }.contact-actions p, .contact-actions small { color: var(--muted); }.contact-actions .button { width: 100%; margin-top: 10px; }.contact-actions small { display: block; margin-top: 12px; text-align: center; }
.download-section { padding: 20px 0 100px; }.download-card { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 24px; padding: 34px; background: var(--surface); border: 1px solid var(--line); border-radius: 24px; }.download-card img { border-radius: 18px; }.download-card h2 { margin: 4px 0; font-size: 30px; }.download-card p { margin: 0; color: var(--muted); }
footer { border-top: 1px solid var(--line); background: var(--surface); }.footer-inner { min-height: 116px; display: flex; flex-wrap: wrap; align-items: center; gap: 14px 28px; padding-block: 18px; color: var(--muted); font-size: 13px; }.footer-inner p { margin: 0; }.footer-inner .copyright { margin-left: auto; }.footer-brand { font-size: 16px; color: var(--ink); }.icp-record { flex: 0 0 100%; margin-top: 4px; text-align: center; font-size: 11px; opacity: .68; }.icp-record a { color: inherit; }
.reveal { opacity: 1; transform: none; transition: opacity .6s ease, transform .6s ease; }.reveal.reveal-pending { opacity: 0; transform: translateY(16px); }.reveal.visible { opacity: 1; transform: none; }
.legal-main { min-height: calc(100vh - 190px); padding-block: 64px 90px; }
.legal-card { max-width: 860px; margin: auto; padding: clamp(28px, 5vw, 58px); background: var(--surface); border: 1px solid var(--line); border-radius: 26px; box-shadow: var(--shadow); }
.legal-card h1 { margin: 8px 0 4px; font-size: clamp(34px, 6vw, 54px); letter-spacing: -.04em; }
.legal-card h2 { margin: 36px 0 10px; font-size: 21px; }
.legal-card p, .legal-card li { color: var(--muted); }
.legal-card a { color: var(--blue-deep); text-decoration: underline; text-underline-offset: 3px; }
.legal-meta { margin: 0 0 30px; color: var(--muted); font-size: 13px; }
.legal-back { display: inline-flex; margin-top: 34px; }
@media (max-width: 920px) {
  .hero { grid-template-columns: 1fr; text-align: center; padding-top: 70px; }.hero-copy { display: flex; flex-direction: column; align-items: center; }.hero-art { min-height: 450px; }.feature-grid { grid-template-columns: repeat(2, 1fr); }.reading-highlight { grid-template-columns: 1fr; gap: 30px; }.preview-grid, .privacy-panel { grid-template-columns: 1fr; }.preview-copy { max-width: 650px; }.trust-grid { grid-template-columns: repeat(2, 1fr); padding-block: 14px; gap: 10px; }.contact-panel { grid-template-columns: 1fr; }.download-card { grid-template-columns: auto 1fr; }.download-card .button { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  body { overflow-x: hidden; }
  .shell { width: min(calc(100% - 28px), var(--shell)); }
  .nav { height: 64px; }
  .nav-links { display: none; }
  .hero { min-height: auto; padding-block: 62px 72px; gap: 35px; }
  .hero-copy, .hero-copy > *, .section-heading { min-width: 0; max-width: 100%; }
  h1 { font-size: clamp(40px, 11.5vw, 52px); letter-spacing: -.06em; overflow-wrap: anywhere; }
  h2 { font-size: clamp(30px, 9vw, 40px); overflow-wrap: anywhere; }
  .hero-lead { width: 100%; overflow-wrap: anywhere; }
  .hero-actions { justify-content: center; }
  .hero-art { width: 100%; min-height: 360px; overflow: hidden; }
  .art-card { width: min(280px, calc(100% - 42px)); padding: 16px; border-radius: 26px; }
  .mini-card { min-width: 0; width: min(145px, 42%); padding: 10px 12px; }
  .mini-pink { left: 0; }
  .mini-mint { right: 0; }
  .trust-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); font-size: 12px; }
  .trust-grid span { min-width: 0; overflow-wrap: anywhere; }
  .section { padding-block: 78px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { min-width: 0; min-height: 220px; }
  .feature-top { margin-bottom: 24px; }
  .reading-highlight { min-width: 0; padding: 28px; }
  .reading-demo { min-width: 0; padding: 20px; }
  .reading-demo-head, .reading-row { min-width: 0; }
  .reading-demo > strong { font-size: 28px; }
  .privacy-panel, .letter, .contact-actions { min-width: 0; padding: 28px; }
  .download-card { min-width: 0; display: flex; flex-direction: column; align-items: flex-start; }
  .download-card .button { width: 100%; }
  .footer-inner { padding-block: 24px; }
  .footer-inner .copyright { margin-left: 0; }
  .footer-inner > p:not(.icp-record) { width: 100%; }
  .legal-card { min-width: 0; overflow: hidden; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .reveal, .reveal.reveal-pending { opacity: 1; transform: none; transition: none; } .button, .feature-card { transition: none; }.feature-card:hover { transform: none; } }