:root {
  --chestnut: #8b3f2f;
  --chestnut-dark: #5c281f;
  --orange: #e58a3b;
  --cream: #fff7ea;
  --paper: #fffdf9;
  --ink: #332822;
  --muted: #78685f;
  --line: #eadbc8;
  --sage: #6c7d61;
  --shadow: 0 18px 45px rgba(84, 42, 25, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--cream);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 253, 249, .94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 800; letter-spacing: 1px; font-size: 18px; color: var(--chestnut-dark); }
.brand img { width: 40px; height: 40px; border-radius: 12px; object-fit: cover; box-shadow: 0 5px 14px rgba(114, 49, 27, .2); }
.nav-links { display: flex; align-items: center; gap: 22px; color: var(--muted); font-size: 14px; }
.nav-links a { padding: 8px 0; border-bottom: 2px solid transparent; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--chestnut); border-color: var(--orange); }
.nav-download, .download-btn { display: inline-flex; align-items: center; justify-content: center; gap: 7px; background: var(--chestnut); color: #fff; border-radius: 8px; padding: 11px 18px; font-weight: 700; border: 0; box-shadow: 0 10px 20px rgba(116, 50, 31, .18); transition: transform .2s, background .2s; }
.nav-download:hover, .download-btn:hover { background: var(--chestnut-dark); transform: translateY(-2px); }
.hero { padding: 84px 0 70px; background: radial-gradient(circle at 85% 15%, #ffe1b4 0, transparent 30%), linear-gradient(135deg, #fff8ec 0, #f4e3cf 100%); border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(300px, .9fr); gap: 64px; align-items: center; }
.eyebrow { color: var(--chestnut); font-weight: 800; font-size: 13px; letter-spacing: 2px; text-transform: uppercase; }
h1, h2, h3 { margin: 0; line-height: 1.25; color: var(--chestnut-dark); }
h1 { font-size: clamp(34px, 5vw, 56px); letter-spacing: -1px; margin: 10px 0 18px; }
h2 { font-size: clamp(26px, 3.5vw, 36px); }
h3 { font-size: 19px; }
.hero p { max-width: 640px; color: #66554a; font-size: 17px; margin: 0 0 28px; }
.hero-actions { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.text-link { color: var(--chestnut); font-weight: 700; border-bottom: 1px solid currentColor; }
.hero-note { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 25px; color: var(--muted); font-size: 13px; }
.hero-note span { display: inline-flex; align-items: center; gap: 6px; }
.hero-art { position: relative; min-height: 365px; }
.hero-art::before { content: ""; position: absolute; width: 280px; height: 280px; right: 24px; top: 20px; border-radius: 50%; background: #e8b163; opacity: .42; }
.hero-screen { position: absolute; width: min(250px, 64%); max-width: 400px; border: 10px solid #2f2420; border-radius: 28px; box-shadow: var(--shadow); object-fit: cover; }
.hero-screen.main { right: 15%; top: 0; height: 360px; }
.hero-screen.back { left: 6%; bottom: 8px; width: min(185px, 48%); height: 260px; transform: rotate(-7deg); opacity: .92; }
.section { padding: 82px 0; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 20px; margin-bottom: 32px; }
.section-head > div:last-child { max-width: 440px; color: var(--muted); font-size: 14px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 25px; min-height: 185px; box-shadow: 0 7px 22px rgba(100, 54, 26, .05); }
.feature-icon { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 50%; background: #f9e1bf; color: var(--chestnut); font-size: 20px; margin-bottom: 16px; }
.feature-card p { margin: 9px 0 0; color: var(--muted); font-size: 14px; }
.gallery { background: #34231d; color: #fff5e8; }
.gallery h2 { color: #fff5e8; }
.gallery .section-head > div:last-child { color: #d8c4b5; }
.gallery-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 15px; align-items: start; }
.gallery figure { margin: 0; }
.gallery figure img { width: 100%; max-width: 400px; aspect-ratio: 4 / 5; object-fit: cover; border-radius: 10px; border: 1px solid #63483d; }
.gallery figcaption { color: #dbc8b8; font-size: 12px; margin-top: 8px; }
.split-band { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.info-panel { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 30px; }
.info-panel ul { list-style: none; padding: 0; margin: 20px 0 0; display: grid; gap: 14px; }
.info-panel li { display: flex; gap: 10px; color: var(--muted); }
.info-panel li::before { content: "✓"; color: var(--sage); font-weight: 800; }
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.review { margin: 0; background: #f7ead8; border: 1px solid #ecd4b8; border-radius: 10px; padding: 24px; }
.review p { margin: 0; color: #5d493f; }
.review cite { display: block; margin-top: 15px; color: var(--chestnut); font-size: 13px; font-style: normal; font-weight: 700; }
.cta { background: var(--orange); color: #3f2117; padding: 28px 0; }
.cta-wrap { display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.cta h2 { color: #3f2117; font-size: 28px; }
.cta .download-btn { background: #3f2117; }
.cta .download-btn:hover { background: #24130e; }
.page-hero { padding: 74px 0 52px; background: linear-gradient(120deg, #fff8ec, #f3dfc8); border-bottom: 1px solid var(--line); }
.page-hero p { max-width: 760px; color: var(--muted); margin: 16px 0 0; font-size: 16px; }
.content-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 40px; align-items: start; }
.article { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: clamp(24px, 4vw, 44px); }
.article h2 { font-size: 27px; margin: 34px 0 14px; }
.article h2:first-child { margin-top: 0; }
.article h3 { margin: 24px 0 8px; }
.article p { margin: 0 0 16px; color: #5e4f46; }
.step-list { list-style: none; padding: 0; margin: 20px 0; display: grid; gap: 14px; counter-reset: steps; }
.step-list li { counter-increment: steps; display: grid; grid-template-columns: 34px 1fr; gap: 13px; color: #5e4f46; }
.step-list li::before { content: counter(steps); width: 30px; height: 30px; display: grid; place-items: center; border-radius: 50%; background: var(--chestnut); color: white; font-weight: 800; }
.tip { border-left: 4px solid var(--orange); background: #fff4df; padding: 15px 17px; margin: 18px 0; color: #644a3b; }
.side-nav { position: sticky; top: 95px; background: #f7ead8; border: 1px solid var(--line); border-radius: 10px; padding: 20px; }
.side-nav strong { color: var(--chestnut-dark); }
.side-nav ul { list-style: none; margin: 12px 0 0; padding: 0; display: grid; gap: 9px; font-size: 14px; color: var(--muted); }
.side-nav a:hover { color: var(--chestnut); }
.faq-list { display: grid; gap: 11px; }
.faq-list details { border: 1px solid var(--line); border-radius: 8px; background: #fffaf2; padding: 15px 17px; }
.faq-list summary { cursor: pointer; color: var(--chestnut-dark); font-weight: 800; }
.faq-list details p { margin: 10px 0 0; }
.site-footer { background: #241a16; color: #d8c9be; padding: 38px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 30px; }
.site-footer .brand { color: #fff3e3; }
.site-footer .brand img { width: 34px; height: 34px; }
.site-footer h3 { color: #fff3e3; font-size: 15px; margin-bottom: 10px; }
.site-footer p, .site-footer li { font-size: 13px; color: #b9a99d; margin: 0; }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 5px; }
.disclaimer { border-top: 1px solid #4c3a31; margin-top: 26px; padding-top: 17px; font-size: 12px; color: #a99588; }
@media (max-width: 860px) {
  .hero-grid, .content-layout { grid-template-columns: 1fr; }
  .hero-art { min-height: 340px; max-width: 540px; margin: 0 auto; width: 100%; }
  .feature-grid, .review-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 9px; }
  .side-nav { position: static; order: -1; }
}
@media (max-width: 620px) {
  .container { width: min(100% - 28px, 1120px); }
  .nav-wrap { min-height: 64px; }
  .nav-links { gap: 12px; font-size: 12px; }
  .nav-download { padding: 8px 11px; font-size: 12px; }
  .hero { padding: 56px 0 45px; }
  .hero p { font-size: 15px; }
  .hero-screen.main { right: 9%; }
  .hero-screen.back { left: 0; }
  .section { padding: 58px 0; }
  .section-head, .cta-wrap { display: block; }
  .section-head > div:last-child { margin-top: 12px; }
  .feature-grid, .review-grid, .split-band { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .gallery figure:nth-child(n+5) { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 20px; }
  .cta .download-btn { margin-top: 17px; }
}