:root {
  --ink: #072f52;
  --ink-soft: #15587d;
  --body: #2d6b93;
  --paper: #f5fbff;
  --surface: #ffffff;
  --line: #c7eaff;
  --blue: #1fa4ff;
  --blue-dark: #056da8;
  --blue-pale: #e8f7ff;
  --coral: #46bdff;
  --feature-card-surface: #f7f3ea;
  --section-space: 122px;
  --heading-gap: 48px;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; overflow-x: hidden; background: var(--paper); color: var(--ink); font-family: var(--sans); }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 1.9; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--blue); outline-offset: 4px; }
.shell { width: min(1180px, calc(100% - 64px)); margin: 0 auto; }
section[id] { scroll-margin-top: 88px; }
.site-header { position: fixed; z-index: 20; inset: 0 0 auto; display: flex; align-items: center; justify-content: space-between; height: 70px; padding: 0 max(32px, calc((100vw - 1180px) / 2)); border-bottom: 1px solid rgba(16, 47, 58, .1); background: rgba(246, 251, 252, .94); backdrop-filter: blur(16px); }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-size: 16px; font-weight: 700; white-space: nowrap; }
.brand img { border-radius: 7px; }
.site-nav { display: flex; align-items: center; gap: 25px; color: var(--ink-soft); font-size: 13px; font-weight: 600; }
.site-nav a { padding: 9px 0; border-bottom: 1px solid transparent; }
.site-nav a:hover { border-color: var(--blue); color: var(--blue-dark); }
.header-download, .button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid transparent; font-weight: 700; transition: transform .2s ease, background .2s ease, box-shadow .2s ease; }
.header-download { min-height: 40px; padding: 0 13px; border-radius: 6px; background: var(--blue); color: #fff; box-shadow: 0 8px 18px rgba(22, 134, 223, .18); font-size: 12px; }
.header-download:hover, .button:hover { transform: translateY(-2px); }
.header-download:hover, .button-primary:hover { background: var(--blue); }
.page-shell { width: min(1180px, calc(100% - 64px)); margin: 0 auto; }
.hero { position: relative; overflow: visible; padding: 274px 0 204px; background: radial-gradient(circle at 50% 82%, rgba(31, 164, 255, .18), transparent 31%), linear-gradient(180deg, #fbfeff 0%, #e8f7ff 100%); }
.hero::before { position: absolute; z-index: 0; inset: 0; background: radial-gradient(circle at 14% 22%, rgba(31, 164, 255, .16), transparent 22%), radial-gradient(circle at 86% 26%, rgba(31, 164, 255, .22), transparent 25%); content: ""; pointer-events: none; }
.hero-copy { position: relative; z-index: 2; display: flex; flex-direction: column; align-items: center; width: min(760px, calc(100% - 64px)); padding: 0; text-align: center; }
.hero h1, h2 { margin: 0; color: var(--ink); font-family: var(--sans); font-weight: 700; }
.hero h1 { font-size: 78px; line-height: 1.1; }
.hero-lead { max-width: 540px; margin: 35px 0; color: var(--body); font-size: 16px; line-height: 1.85; }
.hero-actions { display: flex; align-items: center; justify-content: center; gap: 22px; }
.button { min-height: 52px; padding: 0 20px; border-radius: 7px; }
.hero .button-primary { min-height: 72px; padding: 0 38px; border-radius: 999px; font-size: 18px; box-shadow: 0 18px 32px rgba(31, 164, 255, .32); }
.hero .button-primary svg { width: 20px; height: 20px; }
.button-primary { background: var(--blue); color: #fff; box-shadow: 0 16px 28px rgba(22, 134, 223, .23); }
.features { padding: var(--section-space) 0; background: #fff; }
.section-intro { display: grid; grid-template-columns: 1fr .72fr; align-items: end; gap: 70px; margin-bottom: 52px; }
h2 { font-size: 53px; line-height: 1.25; }
.section-intro > p:last-child { max-width: 410px; margin: 0 0 5px; color: var(--body); font-size: 15px; line-height: 1.85; }
.features-intro { display: grid; grid-template-columns: 1fr .72fr; align-items: end; column-gap: 64px; max-width: none; margin-bottom: var(--heading-gap); }
.features-heading { display: grid; gap: 16px; }
.features-heading h2, .reading-copy h2, .reviews-heading h2, .faq h2 { position: relative; top: -.2em; margin-bottom: -.2em; }
.features-intro h2 { max-width: 600px; }
.features-intro > p:last-child { justify-self: end; max-width: 440px; margin: 0 0 6px; text-align: right; }
.feature-scenes { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.feature-scene { overflow: hidden; border-radius: 16px; background: #fff; box-shadow: 0 16px 38px rgba(7, 84, 134, .09); }
.scene-shelf, .scene-cache { display: grid; grid-template-rows: 1fr auto; }
.scene-discover { display: grid; grid-column: 1 / -1; grid-template-columns: 1.42fr .58fr; }
.scene-ui { min-width: 0; padding: 24px; background: var(--feature-card-surface); }
.scene-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 18px; color: var(--ink); font-size: 12px; }
.scene-toolbar b { font-size: 14px; line-height: 1.4; }
.scene-toolbar span { color: var(--body); font-size: 11px; font-weight: 600; }
.scene-covers { display: grid; grid-template-columns: repeat(4, 1fr); gap: 13px; }
.scene-covers figure { min-width: 0; margin: 0; }
.scene-covers img { width: 100%; height: auto; aspect-ratio: 4 / 5; border-radius: 8px; object-fit: contain; }
.scene-covers figcaption { margin-top: 9px; color: var(--ink-soft); font-size: 11px; font-weight: 700; }
.scene-copy { display: flex; flex-direction: column; justify-content: flex-end; padding: 32px; }
.scene-copy h3 { margin: 0 0 13px; color: var(--ink); font-family: var(--sans); font-size: 25px; line-height: 1.45; }
.scene-copy p { margin: 0; color: var(--body); font-size: 14px; line-height: 1.8; }
.shelf-ui { min-height: 315px; background: #edfcff; }
.shelf-scene-row { display: grid; grid-template-columns: 76px 1fr auto; align-items: center; gap: 16px; padding: 14px; border-radius: 12px; background: #fff; }
.shelf-scene-row > img { width: 76px; height: auto; aspect-ratio: 4 / 5; border-radius: 7px; object-fit: contain; }
.shelf-scene-row > div { display: grid; gap: 7px; }
.shelf-scene-row b { color: var(--ink); font-size: 14px; }
.shelf-scene-row span { color: var(--body); font-size: 11px; }
.shelf-scene-row i { display: block; width: 100%; height: 4px; overflow: hidden; background: var(--line); }
.shelf-scene-row em { display: block; width: 39%; height: 100%; background: var(--blue); }
.shelf-scene-row > strong { color: var(--blue-dark); font-size: 12px; }
.shelf-thumbnails { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; max-width: 348px; margin-top: 13px; }
.shelf-thumbnails img { width: 100%; height: auto; aspect-ratio: 4 / 5; border-radius: 7px; object-fit: contain; }
.cache-ui { display: grid; grid-template-columns: 145px 1fr; align-items: center; gap: 22px; min-height: 315px; background: var(--feature-card-surface); }
.cache-cover { width: 145px; height: auto; aspect-ratio: 4 / 5; border-radius: 10px; object-fit: contain; }
.chapter-list { min-width: 0; }
.chapter-list p { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 0; padding: 16px 0; border-top: 1px solid rgba(7, 84, 134, .14); color: var(--ink-soft); font-size: 12px; }
.chapter-list p strong { color: var(--blue-dark); font-size: 11px; }
.reading { overflow: hidden; padding: var(--section-space) 0; background: #eef9ff; }
.reading-layout { display: grid; grid-template-columns: .87fr 1.13fr; align-items: center; gap: 104px; }
.reading-device { position: relative; display: flex; align-items: center; justify-content: center; min-height: 620px; margin: 0; }
.reading-device::before { position: absolute; width: 346px; height: 346px; border-radius: 50%; background: var(--blue-pale); box-shadow: 0 0 0 34px rgba(255,255,255,.52), 0 0 0 68px rgba(216,241,255,.7); content: ""; }
.phone-case { position: relative; z-index: 1; width: 310px; padding: 11px; border: 1px solid #b7e4fc; border-radius: 34px; background: #fff; box-shadow: 18px 24px 0 rgba(31,164,255,.13), 0 25px 50px rgba(7,47,82,.14); }
.phone-notch { position: absolute; z-index: 2; top: 18px; left: calc(50% - 41px); width: 82px; height: 16px; border-radius: 999px; background: var(--ink); }
.phone-screen { min-height: 500px; overflow: hidden; padding: 15px 12px 12px; border-radius: 25px; background: #f8fdff; }
.phone-status, .phone-appbar, .phone-tabs, .phone-continue { display: flex; align-items: center; justify-content: space-between; }
.phone-status { padding: 0 5px; color: var(--ink-soft); font-size: 10px; font-weight: 700; }
.phone-appbar { padding: 20px 5px 14px; }
.phone-appbar strong { color: var(--ink); font-family: var(--sans); font-size: 19px; }
.phone-appbar span { color: var(--blue-dark); font-size: 19px; font-weight: 700; letter-spacing: .12em; }
.phone-tabs { gap: 13px; justify-content: flex-start; padding: 0 5px 12px; border-bottom: 1px solid var(--line); color: var(--body); font-size: 11px; }
.phone-tabs b { color: var(--blue-dark); }
.phone-collage { display: grid; grid-template-columns: repeat(2, 1fr); gap: 7px; padding: 12px 0; }
.phone-cover { display: block; aspect-ratio: 4 / 5; overflow: hidden; border-radius: 6px; background: var(--blue-pale); }
.phone-cover img { width: 100%; height: 100%; object-fit: contain; }
.phone-continue { gap: 10px; margin-top: 2px; padding: 12px; border-radius: 12px; background: var(--blue-pale); }
.phone-continue div { display: grid; gap: 4px; }
.phone-continue b { color: var(--ink); font-size: 11px; }
.phone-continue span { color: var(--body); font-size: 10px; }
.phone-continue i { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; background: var(--blue); color: #fff; font-size: 10px; font-style: normal; font-weight: 700; }
.reading-copy h2 { color: var(--ink); }
.reading-copy > p { max-width: 490px; margin: 25px 0 32px; color: var(--body); font-size: 15px; line-height: 1.85; }
.reading-list { margin: 0; padding: 0; border-top: 1px solid var(--line); list-style: none; }
.reading-list li { display: grid; grid-template-columns: 42px minmax(0, 1fr); align-items: baseline; gap: 12px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.reading-list > li > b { color: var(--blue); font-size: 12px; }
.reading-list h3 { margin: 0 0 7px; color: var(--ink); font-family: var(--sans); font-size: 18px; }
.reading-list p { margin: 0; color: var(--body); font-size: 13px; line-height: 1.7; }
.reviews { padding: var(--section-space) 0; background: var(--surface); }
.reviews-heading { display: flex; align-items: end; justify-content: space-between; gap: 60px; margin-bottom: var(--heading-gap); }
.reviews-heading h2 { font-size: 53px; }
.review-wall { display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px; }
.review-card { display: flex; grid-column: span 2; flex-direction: column; justify-content: space-between; min-height: 218px; margin: 0; padding: 25px; border-radius: 10px; background: #fff; box-shadow: 0 12px 30px rgba(7, 84, 134, .09); }
.review-card > p { max-width: 27ch; margin: 0; color: var(--ink); font-family: var(--sans); font-size: 18px; line-height: 1.68; }
.review-card footer { display: flex; align-items: center; gap: 10px; margin-top: 25px; }
.review-avatar { display: grid; place-items: center; flex: 0 0 auto; width: 34px; height: 34px; border-radius: 50%; background: var(--blue); color: #fff; font-family: var(--sans); font-size: 13px; font-weight: 700; }
.review-card footer > span:last-child { display: grid; gap: 3px; }
.review-card footer b { color: var(--ink-soft); font-size: 12px; }
.faq { display: grid; grid-template-columns: .79fr 1.21fr; gap: 100px; padding-block: var(--section-space); }
.faq-list { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 23px 0; color: var(--ink); cursor: pointer; font-family: var(--sans); font-size: 19px; font-weight: 700; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary svg { flex: 0 0 auto; color: var(--blue); transition: transform .2s ease; }
.faq details[open] summary svg { transform: rotate(45deg); }
.faq details p { max-width: 560px; margin: -2px 0 23px; color: var(--body); font-size: 14px; line-height: 1.8; }
.download { margin-bottom: 78px; padding: 0; }
.download-panel { position: relative; display: flex; align-items: center; flex-direction: column; min-height: 0; overflow: hidden; padding: 56px 40px; border-radius: 24px; background: var(--blue); box-shadow: 0 22px 44px rgba(7, 91, 157, .16); text-align: center; }
.download-panel::before, .download-panel::after { position: absolute; border: 1px solid rgba(255,255,255,.25); border-radius: 50%; content: ""; pointer-events: none; }
.download-panel::before { top: -112px; right: 64px; width: 230px; height: 230px; background: rgba(255,255,255,.08); }
.download-panel::after { bottom: -102px; left: 82px; width: 180px; height: 180px; background: rgba(7,84,134,.13); }
.download-copy { position: relative; z-index: 1; }
.download-copy h2 { color: #fff; font-size: 42px; line-height: 1.2; }
.download-copy p { margin: 20px 0 0; color: rgba(255,255,255,.9); font-size: 15px; line-height: 1.7; }
.button-download { position: relative; z-index: 1; min-width: 0; width: min(100%, 340px); min-height: 72px; margin-top: 31px; padding: 0 34px; border-radius: 999px; background: #ffdb4d; color: var(--ink); box-shadow: 0 12px 26px rgba(5, 91, 157, .2); font-size: 18px; }
.button-download svg { width: 20px; height: 20px; }
.button-download:hover { background: #ffdb4d; }
.button-download:focus-visible { outline-color: #ffdb4d; }
.site-footer { display: grid; grid-template-columns: 1fr auto; gap: 34px; padding: 45px 0; }
.site-footer > div > p { margin: 12px 0 0; color: var(--body); font-size: 13px; }
.site-footer nav { display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: flex-end; gap: 19px; color: var(--ink-soft); font-size: 13px; font-weight: 600; }
.site-footer nav a:hover { color: var(--blue-dark); }
.site-footer small { grid-column: 1 / -1; color: var(--body); font-size: 11px; }
@media (max-width: 960px) {
  .site-nav { gap: 16px; }
  .reading-layout { gap: 55px; }
  .hero h1 { font-size: 58px; }
  .section-intro, .faq { gap: 60px; }
}
@media (max-width: 760px) {
  :root { --section-space: 82px; --heading-gap: 36px; }
  .shell, .page-shell { width: min(100% - 36px, 620px); }
  .site-header { height: 64px; padding: 0 18px; }
  .site-nav { display: none; }
  .hero { padding: 208px 0 144px; }
  .hero h1 { font-size: 50px; }
  .hero-lead { margin: 30px 0; font-size: 15px; }
  .section-intro { display: block; margin-bottom: var(--heading-gap); }
  .section-intro > p:last-child { margin-top: 18px; }
  .reading-layout { grid-template-columns: 1fr; gap: 48px; }
  .faq { grid-template-columns: 1fr; row-gap: var(--heading-gap); }
  .download { margin-bottom: 52px; }
  .download-panel { min-height: 0; padding: 48px 38px; border-radius: 34px; }
  .site-footer { grid-template-columns: 1fr; gap: 28px; }
  .site-footer nav { justify-content: flex-start; }
}
@media (max-width: 760px) {
  .reading-layout { gap: 44px; }
  .reading-copy { order: 1; }
  .reading-list li { grid-template-columns: 20px minmax(0, 1fr); column-gap: 10px; }
  .reading-device { order: 2; min-height: 590px; }
}
@media (max-width: 760px) {
  .reviews-heading { display: block; }
  .review-wall { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .review-card { grid-column: span 1; min-height: 220px; padding: 22px; }
  .review-card > p { font-size: 17px; }
}
@media (max-width: 480px) {
  :root { --section-space: 72px; }
  .hero { padding: 94px 0 62px; }
  .hero h1 { font-size: 42px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 17px; }
  .hero .button-primary { width: 100%; }
  .faq summary { font-size: 17px; }
  .download-copy h2, h2 { font-size: 38px; }
  .features-intro h2 { font-size: 34px; }
  .download-panel { padding: 38px 22px; border-radius: 26px; }
  .button { width: 100%; }
  .site-footer nav { gap: 13px 18px; }
}
@media (max-width: 480px) {
  .reading-device { min-height: 555px; }
  .phone-case { width: 278px; padding: 9px; border-radius: 30px; }
  .phone-notch { top: 15px; left: calc(50% - 36px); width: 72px; height: 14px; }
  .phone-screen { min-height: 505px; padding: 14px 10px 10px; border-radius: 22px; }
  .phone-appbar { padding-top: 18px; }
  .phone-collage { gap: 6px; padding: 10px 0; }
}
@media (max-width: 480px) {
  .reviews-heading h2 { font-size: 38px; }
  .review-wall { grid-template-columns: 1fr; }
  .review-card { min-height: 0; padding: 23px 21px; }
  .review-card > p { max-width: 31ch; }
  .review-card footer { margin-top: 23px; }
}
@media (max-width: 760px) {
  .review-wall { gap: 16px; }
  .download-panel { min-height: 0; padding: 48px 34px; border-radius: 20px; }
  .download-panel::before { right: -72px; }
  .download-panel::after { bottom: -116px; left: -62px; }
  .download-copy h2 { font-size: 38px; }
}
@media (max-width: 480px) {
  .download-panel { min-height: 0; padding: 40px 22px; border-radius: 18px; }
  .download-copy h2 { font-size: clamp(24px, 7.4vw, 34px); }
  .download-copy p { max-width: 22em; font-size: 14px; }
}
@media (max-width: 960px) {
  .header-download { min-height: 44px; padding: 0 16px; font-size: 13px; }
  .header-download svg { display: none; }
  .header-download span { display: inline; }
  .hero .button-primary { min-height: 76px; padding: 0 42px; font-size: 19px; }
}
@media (max-width: 760px) {
  .header-download { min-width: 0; padding: 0 15px; }
  .header-download span { display: inline; }
  .features-intro > p:last-child { justify-self: auto; text-align: left; }
  .feature-scenes { grid-template-columns: 1fr; }
  .scene-discover { grid-template-columns: 1fr; }
  .scene-ui { padding: 20px; }
  .scene-copy { padding: 28px; }
  .scene-copy h3 { font-size: 23px; }
  .shelf-ui, .cache-ui { min-height: 0; }
}
@media (max-width: 560px) {
  .hero { padding: 176px 0 112px; }
  .hero-actions { width: 100%; align-items: center; }
  .hero .button-primary { width: 100%; min-height: 60px; padding: 0 24px; font-size: 18px; }
  .scene-ui { padding: 16px; }
  .scene-toolbar b { font-size: 15px; }
  .scene-covers { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .scene-copy { padding: 25px 22px 27px; }
  .scene-copy h3 { font-size: 21px; }
  .shelf-scene-row { grid-template-columns: 64px 1fr; gap: 13px; padding: 11px; }
  .shelf-scene-row > img { width: 64px; }
  .shelf-scene-row > strong { display: none; }
  .cache-ui { grid-template-columns: 110px 1fr; gap: 15px; }
  .cache-cover { width: 110px; }
  .chapter-list p { padding: 12px 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}