:root {
  --ink: #152238;
  --muted: #637086;
  --paper: #f6f8fb;
  --card: #ffffff;
  --orange: #ff7548;
  --gold: #ffb53d;
  --teal: #35c9c2;
  --line: #e4e9f0;
  --shadow: 0 18px 50px rgba(21, 34, 56, .10);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif; line-height: 1.75; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(246,248,251,.94); backdrop-filter: blur(16px); border-bottom: 1px solid rgba(228,233,240,.88); }
.nav { height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 800; letter-spacing: .04em; }
.brand img { width: 43px; height: 43px; object-fit: contain; }
.brand span { font-size: 20px; }
.nav-links { display: flex; align-items: center; gap: 26px; font-size: 14px; color: var(--muted); }
.nav-links a { padding: 9px 0; position: relative; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--ink); }
.nav-links a[aria-current="page"]::after { content: ""; position: absolute; height: 3px; left: 0; right: 0; bottom: 0; border-radius: 3px; background: var(--orange); }
.nav-download, .button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 0; border-radius: 10px; font: inherit; font-weight: 800; cursor: pointer; transition: transform .2s ease, box-shadow .2s ease; }
.nav-download { padding: 10px 16px; background: var(--ink); color: #fff; font-size: 13px; }
.button { padding: 14px 22px; background: linear-gradient(135deg, var(--orange), #ff9860); color: #fff; box-shadow: 0 10px 22px rgba(255,117,72,.24); }
.button:hover, .nav-download:hover { transform: translateY(-2px); }
.button.secondary { background: #fff; color: var(--ink); box-shadow: none; border: 1px solid var(--line); }
.menu-toggle { display: none; background: none; border: 0; font-size: 26px; color: var(--ink); }
.hero { padding: 76px 0 50px; background: radial-gradient(circle at 85% 12%, rgba(53,201,194,.16), transparent 30%), radial-gradient(circle at 5% 30%, rgba(255,181,61,.18), transparent 28%); }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 58px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; color: var(--orange); font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .12em; }
.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--orange); }
h1 { margin: 16px 0 18px; font-size: clamp(34px, 5vw, 62px); line-height: 1.15; letter-spacing: -.03em; }
.hero-copy > p { max-width: 650px; margin: 0; color: var(--muted); font-size: 17px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.hero-note { margin-top: 18px; color: var(--muted); font-size: 12px; }
.hero-art { position: relative; min-height: 480px; }
.hero-panel { position: absolute; inset: 0 72px 0 72px; border-radius: 24px; background: var(--ink); overflow: hidden; box-shadow: var(--shadow); }
.hero-panel::before { content: ""; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(255,117,72,.24), rgba(21,34,56,0) 42%), url('../images/app-screen-04.png') center/contain no-repeat; }
.hero-sticker { position: absolute; z-index: 1; left: -4px; top: 16px; padding: 13px 17px; background: var(--gold); border-radius: 12px; font-size: 13px; font-weight: 800; box-shadow: 0 12px 26px rgba(21,34,56,.16); }
.hero-stat { position: absolute; z-index: 1; right: -94px; bottom: 18px; width: 170px; padding: 16px; background: #fff; border-radius: 14px; box-shadow: var(--shadow); }
.hero-stat strong { display: block; font-size: 26px; line-height: 1.15; }
.hero-stat span { color: var(--muted); font-size: 12px; }
.section { padding: 88px 0; }
.section.alt { background: #fff; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 32px; }
.section h2 { margin: 0; font-size: 32px; line-height: 1.25; letter-spacing: -.02em; }
.section-kicker { margin: 0; color: var(--orange); font-size: 12px; font-weight: 800; letter-spacing: .12em; }
.section-head > p { margin: 0; max-width: 460px; color: var(--muted); font-size: 14px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feature { padding: 25px; border: 1px solid var(--line); background: var(--card); border-radius: 14px; min-height: 200px; }
.feature-icon { display: grid; place-items: center; width: 42px; height: 42px; margin-bottom: 20px; background: #fff2ea; color: var(--orange); border-radius: 11px; font-size: 20px; font-weight: 900; }
.feature:nth-child(2) .feature-icon { background: #e8fbfa; color: #159f9a; }
.feature:nth-child(3) .feature-icon { background: #fff5da; color: #c07b00; }
.feature h3 { margin: 0 0 9px; font-size: 18px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; }
.screen-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; align-items: start; }
.screen-card { margin: 0; padding: 10px; background: #fff; border: 1px solid var(--line); border-radius: 16px; }
.screen-card img { width: min(100%, 400px); margin: 0 auto; border-radius: 10px; }
.screen-card figcaption { padding: 12px 4px 4px; color: var(--muted); font-size: 12px; }
.story-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 18px; }
.story-card { padding: 32px; border-radius: 16px; background: var(--ink); color: #fff; min-height: 240px; }
.story-card h3 { margin: 0 0 12px; font-size: 25px; }
.story-card p { margin: 0; color: #c6d0de; font-size: 14px; }
.story-card.light { background: #fff; color: var(--ink); border: 1px solid var(--line); }
.story-card.light p { color: var(--muted); }
.quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.quote { padding: 24px; background: #fff; border: 1px solid var(--line); border-radius: 14px; }
.quote p { margin: 0 0 18px; font-size: 15px; }
.quote cite { color: var(--muted); font-size: 12px; font-style: normal; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 44px; }
.stat { padding: 24px; background: #fff; }
.stat strong { display: block; font-size: 30px; line-height: 1.1; }
.stat span { color: var(--muted); font-size: 13px; }
.cta { padding: 70px 0; background: linear-gradient(110deg, var(--teal), #70d9cc); color: var(--ink); }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.cta h2 { margin: 0 0 10px; font-size: 32px; }
.cta p { margin: 0; max-width: 620px; }
.cta .button { background: var(--ink); box-shadow: none; }
.page-hero { padding: 70px 0 42px; background: #fff; border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: clamp(34px, 5vw, 52px); max-width: 800px; }
.page-hero p { max-width: 760px; margin: 0; color: var(--muted); font-size: 16px; }
.article { max-width: 820px; }
.article h2 { margin: 46px 0 16px; font-size: 28px; }
.article h3 { margin: 28px 0 10px; font-size: 19px; }
.article p { margin: 0 0 17px; color: #435166; }
.article ul, .article ol { margin: 0 0 22px; padding-left: 22px; color: #435166; }
.article li { margin: 8px 0; }
.guide-steps { display: grid; gap: 14px; margin: 28px 0 34px; }
.guide-step { display: grid; grid-template-columns: 44px 1fr; gap: 15px; padding: 20px; background: #fff; border: 1px solid var(--line); border-radius: 12px; }
.step-no { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; background: var(--orange); color: #fff; font-weight: 800; }
.guide-step h3 { margin: 0 0 5px; }
.guide-step p { margin: 0; }
.faq-list { display: grid; gap: 12px; }
.faq-list details { padding: 18px 20px; background: #fff; border: 1px solid var(--line); border-radius: 11px; }
.faq-list summary { cursor: pointer; font-weight: 800; }
.faq-list p { margin: 12px 0 0; color: var(--muted); }
.site-footer { padding: 35px 0 42px; background: var(--ink); color: #dbe3ed; }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr .9fr; gap: 28px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 800; }
.footer-brand img { width: 36px; height: 36px; }
.site-footer p, .site-footer li { color: #9eacbf; font-size: 12px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: 7px 0; }
.site-footer a:hover { color: #fff; }
.copyright { margin-top: 28px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); color: #8393aa; font-size: 12px; }
@media (max-width: 860px) {
  .nav-links { gap: 15px; }
  .hero-grid, .story-grid { grid-template-columns: 1fr; }
  .hero-art { min-height: 430px; }
  .screen-grid { grid-template-columns: repeat(3, 1fr); }
  .feature-grid, .quote-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  .container { width: min(100% - 28px, 540px); }
  .nav { height: 66px; }
  .nav-download { display: none; }
  .menu-toggle { display: block; }
  .nav-links { display: none; position: absolute; left: 14px; right: 14px; top: 72px; padding: 12px 18px; background: #fff; border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow); flex-direction: column; align-items: stretch; gap: 3px; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px 4px; }
  .hero { padding: 48px 0 30px; }
  h1 { font-size: 40px; }
  .hero-copy > p { font-size: 15px; }
  .hero-art { min-height: 360px; }
  .hero-panel { inset: 14px 42px 0 42px; }
  .hero-stat { right: -2px; bottom: 8px; }
  .section { padding: 62px 0; }
  .section-head { display: block; margin-bottom: 23px; }
  .section-head > p { margin-top: 12px; }
  .section h2 { font-size: 28px; }
  .feature-grid, .quote-grid, .screen-grid, .stats, .footer-grid { grid-template-columns: 1fr; }
  .screen-card { max-width: 330px; margin: 0 auto; }
  .screen-card img { max-height: 550px; width: auto; }
  .cta-inner { display: block; }
  .cta .button { margin-top: 22px; }
  .page-hero { padding: 50px 0 32px; }
  .page-hero h1 { font-size: 38px; }
}