:root {
    --primary: #385f86;
    --primary-dark: #294866;
    --soft: #eef3f8;
    --secondary: #9a6a24;
    --ink: #202722;
    --muted: #5d6861;
    --line: #dce2de;
    --white: #ffffff;
    --page: #f7f8f7;
    --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--ink);
    background: var(--white);
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
    line-height: 1.7;
    letter-spacing: 0;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container, .header-inner, .footer-inner { width: min(var(--container), calc(100% - 48px)); margin: 0 auto; }
.site-header { height: 76px; border-bottom: 1px solid var(--line); background: rgba(255,255,255,.97); position: sticky; top: 0; z-index: 20; }
.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 21px; font-weight: 800; }
.brand img { width: 42px; height: 42px; border-radius: 10px; }
.main-nav { display: flex; align-items: center; gap: 30px; font-size: 15px; }
.main-nav a { color: #4d5751; position: relative; }
.main-nav a.active { color: var(--primary-dark); font-weight: 700; }
.main-nav a.active::after { content: ""; position: absolute; left: 0; right: 0; bottom: -9px; height: 2px; background: var(--primary); }
.main-nav .nav-download { padding: 9px 18px; color: #fff; background: var(--primary); border-radius: 6px; font-weight: 700; }
.menu-button { display: none; border: 0; background: transparent; padding: 8px; }
.menu-button span { width: 23px; height: 2px; background: var(--ink); display: block; margin: 5px 0; }
.hero { background: linear-gradient(180deg, var(--soft) 0%, #fff 100%); border-bottom: 1px solid var(--line); }
.hero-inner { min-height: 680px; display: grid; grid-template-columns: minmax(0, .94fr) minmax(480px, 1.06fr); gap: 70px; align-items: center; padding: 54px 0 64px; }
.eyebrow { color: var(--primary); font-size: 13px; font-weight: 800; letter-spacing: 1.4px; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
.hero h1 { max-width: 610px; margin: 16px 0 18px; font-size: 56px; line-height: 1.12; letter-spacing: 0; }
.hero-copy > p { max-width: 610px; color: var(--muted); font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0; }
.button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; padding: 10px 24px; border: 1px solid var(--primary); border-radius: 6px; color: #fff; background: var(--primary); font-weight: 750; }
.button:hover { background: var(--primary-dark); }
.button-quiet { color: var(--primary-dark); background: #fff; }
.hero-facts { display: flex; flex-wrap: wrap; gap: 20px; padding: 0; margin: 0; list-style: none; color: #455149; font-size: 14px; }
.hero-facts li { display: flex; align-items: center; gap: 8px; }
.hero-facts span { width: 8px; height: 8px; border-radius: 50%; background: var(--secondary); }
.hero-media { min-height: 500px; position: relative; display: flex; align-items: center; justify-content: center; padding: 40px 78px 62px 20px; }
.hero-media::before { content: ""; position: absolute; inset: 36px 36px 54px 76px; border: 1px solid #cbd8d1; background: rgba(255,255,255,.68); border-radius: 8px; }
.hero-media img { max-width: 280px; max-height: 430px; width: auto; height: auto; object-fit: contain; border-radius: 7px; box-shadow: 0 14px 36px rgba(32,39,34,.13); position: relative; }
.hero-secondary { margin-left: -28px; transform: translateY(24px); opacity: .92; }
.media-label { position: absolute; top: 22px; right: 42px; color: var(--primary-dark); font-size: 12px; font-weight: 800; z-index: 3; }
.media-note { position: absolute; left: 18px; right: 34px; bottom: 22px; z-index: 3; padding: 12px 16px; background: var(--primary-dark); color: #fff; font-size: 13px; border-radius: 5px; }
.section { padding: 88px 0; }
.section:nth-of-type(even) { background: var(--page); }
.section-heading { display: flex; align-items: center; gap: 14px; margin-bottom: 32px; }
.section-heading span { color: var(--secondary); font-size: 13px; font-weight: 800; }
.section-heading h2 { margin: 0; font-size: 32px; line-height: 1.25; }
.preview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; align-items: stretch; }
.preview-grid figure { margin: 0; min-height: 470px; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; padding: 24px; border: 1px solid var(--line); background: #fff; border-radius: 7px; }
.preview-grid img { max-width: 100%; max-height: 390px; width: auto; height: auto; object-fit: contain; }
.preview-grid figcaption { width: 100%; margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; text-align: center; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.feature-grid article { padding: 26px; border-top: 3px solid var(--primary); background: #fff; box-shadow: 0 6px 20px rgba(32,39,34,.06); }
.feature-grid b { font-size: 19px; }
.feature-grid p { margin: 10px 0 0; color: var(--muted); font-size: 15px; }
.collection-layout { display: grid; grid-template-columns: .75fr 1.25fr; gap: 72px; align-items: start; }
.section-copy { color: var(--muted); font-size: 17px; }
.route-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.route-list li { display: grid; grid-template-columns: 52px 1fr; gap: 18px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.route-list > li > span { width: 38px; height: 38px; display: grid; place-items: center; color: #fff; background: var(--primary); border-radius: 50%; font-weight: 800; }
.route-list p { margin: 4px 0 0; color: var(--muted); }
.deep-links { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.deep-links a { min-height: 160px; padding: 28px; border: 1px solid var(--line); background: #fff; display: flex; flex-direction: column; justify-content: space-between; border-radius: 6px; }
.deep-links a:hover { border-color: var(--primary); }
.deep-links span { color: var(--muted); }
.deep-links strong { color: var(--primary-dark); font-size: 20px; }
.faq-preview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.faq-preview-grid article { padding: 24px; background: var(--soft); border-radius: 6px; }
.faq-preview-grid p { color: var(--muted); margin: 8px 0 0; }
.text-link { display: inline-block; margin-top: 24px; color: var(--primary-dark); font-weight: 800; border-bottom: 1px solid currentColor; }
.download-section { padding: 58px 0; color: #fff; background: var(--primary-dark); }
.download-inner { display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.download-inner span { font-size: 12px; letter-spacing: 1px; opacity: .76; }
.download-inner h2 { margin: 7px 0 4px; font-size: 31px; }
.download-copy { margin: 0; opacity: .82; }
.button-light { color: var(--primary-dark); background: #fff; border-color: #fff; white-space: nowrap; }
.site-footer { padding: 40px 0; background: #f2f4f2; border-top: 1px solid var(--line); text-align: center; }
.footer-inner { display: flex; flex-direction: column; align-items: center; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-brand img { border-radius: 9px; }
.footer-inner p { max-width: 780px; margin: 6px auto; color: var(--muted); font-size: 13px; text-align: center; }
.copyright { opacity: .8; }
.inner-hero { padding: 76px 0; background: var(--soft); border-bottom: 1px solid var(--line); }
.inner-hero-grid { display: grid; grid-template-columns: 1fr 380px; gap: 80px; align-items: center; }
.inner-hero h1 { margin: 14px 0 16px; font-size: 48px; line-height: 1.2; }
.inner-hero p { color: var(--muted); font-size: 17px; }
.inner-hero aside { padding: 26px; background: #fff; border-left: 3px solid var(--primary); box-shadow: 0 8px 24px rgba(32,39,34,.06); }
.inner-hero aside ul { padding-left: 20px; margin-bottom: 0; color: var(--muted); }
.guide-list { padding-top: 74px; padding-bottom: 90px; }
.guide-step { display: grid; grid-template-columns: 100px 1fr; gap: 30px; padding: 34px 0; border-bottom: 1px solid var(--line); }
.step-number { color: var(--primary); font-size: 27px; font-weight: 800; }
.guide-step h2 { font-size: 26px; margin-bottom: 10px; }
.guide-step p { color: var(--muted); margin-bottom: 0; }
.guide-summary { margin-top: 48px; padding: 34px; background: var(--soft); border-radius: 7px; }
.guide-summary p { color: var(--muted); }
.guide-summary p a, .faq-end p a { color: var(--primary-dark); font-weight: 800; text-decoration: underline; }
.faq-list { padding-top: 64px; padding-bottom: 90px; }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item button { width: 100%; min-height: 74px; display: grid; grid-template-columns: 54px 1fr 24px; align-items: center; gap: 12px; border: 0; background: transparent; color: var(--ink); font: inherit; font-size: 17px; font-weight: 750; text-align: left; cursor: pointer; }
.faq-item button span { color: var(--secondary); font-size: 12px; }
.faq-item button b { font-size: 22px; color: var(--primary); }
.faq-answer { display: none; padding: 0 54px 22px; }
.faq-answer p { color: var(--muted); margin: 0; }
.faq-item.open .faq-answer { display: block; }
.faq-item.open button b { transform: rotate(45deg); }
.faq-end { margin-top: 54px; padding: 32px; background: var(--soft); border-radius: 7px; }
.faq-end p { color: var(--muted); }
.variant-reader .hero-media::before { inset: 28px 70px 64px 44px; }
.variant-reader .hero-primary { z-index: 2; }
.variant-reader .hero-secondary { position: absolute; right: 22px; max-width: 170px; transform: translateY(70px); }
.variant-timeline .hero-media { justify-content: flex-start; padding-left: 80px; }
.variant-timeline .hero-media::after { content: "01  —  02  —  03"; position: absolute; right: 0; top: 48%; transform: rotate(90deg); color: var(--secondary); font-size: 12px; font-weight: 800; letter-spacing: 2px; }
.variant-folio .hero-primary { transform: translate(-18px, -12px); }
.variant-folio .hero-secondary { transform: translate(5px, 28px); }

@media (max-width: 900px) {
    .container, .header-inner, .footer-inner { width: min(100% - 32px, var(--container)); }
    .site-header { height: 68px; }
    .menu-button { display: block; }
    .main-nav { display: none; position: absolute; top: 68px; left: 0; right: 0; padding: 20px 24px; background: #fff; border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; gap: 14px; }
    .main-nav.open { display: flex; }
    .main-nav a { padding: 8px 0; }
    .main-nav a.active::after { display: none; }
    .main-nav .nav-download { padding: 10px 16px; text-align: center; }
    .hero-inner { min-height: auto; grid-template-columns: 1fr; gap: 24px; padding: 42px 0 56px; }
    .hero h1 { font-size: 42px; }
    .hero-copy > p { font-size: 16px; }
    .hero-media { min-height: 390px; order: 2; padding: 24px 60px 58px 8px; }
    .hero-media::before { inset: 20px 26px 46px 40px; }
    .hero-media img { max-height: 320px; max-width: 220px; }
    .media-note { bottom: 0; left: 0; right: 0; }
    .section { padding: 62px 0; }
    .preview-grid, .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .preview-grid figure { min-height: 410px; }
    .feature-grid article:last-child { grid-column: span 2; }
    .collection-layout, .inner-hero-grid { grid-template-columns: 1fr; gap: 34px; }
    .inner-hero { padding: 58px 0; }
    .inner-hero h1 { font-size: 40px; }
}

@media (max-width: 560px) {
    .container, .header-inner, .footer-inner { width: min(100% - 28px, var(--container)); }
    .brand img { width: 38px; height: 38px; }
    .hero-inner { padding-top: 34px; padding-bottom: 48px; }
    .hero h1 { font-size: 36px; line-height: 1.16; }
    .hero-actions .button { flex: 1 1 140px; }
    .hero-facts { gap: 10px 16px; }
    .hero-media { min-height: 280px; padding: 12px 36px 48px 8px; }
    .hero-media img { max-width: 155px; max-height: 220px; }
    .hero-secondary { margin-left: -38px; }
    .media-label { top: 6px; right: 12px; }
    .media-note { font-size: 12px; padding: 10px 12px; }
    .section { padding: 52px 0; }
    .section-heading { margin-bottom: 24px; }
    .section-heading h2 { font-size: 27px; }
    .preview-grid, .feature-grid, .deep-links, .faq-preview-grid { grid-template-columns: 1fr; }
    .feature-grid article:last-child { grid-column: auto; }
    .preview-grid figure { min-height: 390px; }
    .preview-grid img { max-height: 320px; }
    .download-inner { flex-direction: column; align-items: flex-start; }
    .inner-hero h1 { font-size: 34px; }
    .faq-hero h1 { font-size: 30px; }
    .inner-hero aside { padding: 22px; }
    .guide-list, .faq-list { padding-top: 44px; padding-bottom: 62px; }
    .guide-step { grid-template-columns: 48px 1fr; gap: 14px; padding: 26px 0; }
    .guide-step h2 { font-size: 22px; }
    .guide-summary, .faq-end { padding: 24px; }
    .faq-item button { grid-template-columns: 38px 1fr 18px; font-size: 16px; }
    .faq-answer { padding-left: 38px; padding-right: 18px; }
}