:root {
    --ink: #17333a;
    --muted: #5d7479;
    --line: #d9e5e5;
    --paper: #ffffff;
    --soft: #f3f7f6;
    --teal: #0f766e;
    --teal-dark: #0a5d57;
    --coral: #db6d57;
    --shadow: 0 18px 45px rgba(24, 69, 71, 0.12);
    --radius: 8px;
    --container: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--ink);
    background: var(--paper);
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
    line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button { font: inherit; }

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(12px);
}
.header-inner {
    width: min(calc(100% - 40px), var(--container));
    min-height: 72px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; }
.brand img { width: 42px; height: 42px; border-radius: 8px; }
.main-nav { display: flex; align-items: center; gap: 28px; font-size: 15px; }
.main-nav a { color: #405b60; }
.main-nav a:hover, .main-nav a.active { color: var(--teal); }
.main-nav .nav-download { padding: 9px 18px; color: #fff; background: var(--teal); border-radius: 6px; }
.menu-toggle { display: none; width: 42px; height: 42px; padding: 10px; border: 1px solid var(--line); background: #fff; border-radius: 6px; }
.menu-toggle span { display: block; height: 2px; margin: 4px 0; background: var(--ink); }

.hero { background: linear-gradient(90deg, #f3f8f7 0 70%, #e9f1ef 70%); border-bottom: 1px solid var(--line); }
.hero-inner {
    width: min(calc(100% - 40px), var(--container));
    min-height: 590px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 0.93fr 1.07fr;
    align-items: center;
    gap: 60px;
    padding: 44px 0;
}
.eyebrow { color: var(--teal); font-size: 12px; font-weight: 800; letter-spacing: 0; }
.hero h1 { max-width: 560px; margin: 14px 0 18px; font-size: 50px; line-height: 1.15; letter-spacing: 0; }
.hero-lead { max-width: 610px; margin: 0; color: #49656a; font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button { display: inline-flex; min-height: 46px; padding: 10px 22px; align-items: center; justify-content: center; border: 1px solid transparent; border-radius: 6px; font-weight: 700; }
.button.primary { color: #fff; background: var(--teal); }
.button.primary:hover { background: var(--teal-dark); }
.button.secondary { color: var(--ink); background: #fff; border-color: var(--line); }
.button.light { color: var(--teal-dark); background: #fff; }
.hero-points { display: flex; flex-wrap: wrap; gap: 18px; margin: 26px 0 0; padding: 0; color: #486469; font-size: 14px; list-style: none; }
.hero-points li::before { content: ""; display: inline-block; width: 7px; height: 7px; margin-right: 8px; background: var(--coral); border-radius: 50%; }
.hero-media { position: relative; height: 500px; display: flex; align-items: center; justify-content: center; gap: 22px; }
.hero-shot { position: relative; z-index: 2; margin: 0; padding: 10px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
.hero-shot img { width: 258px; }
.hero-shot figcaption { padding: 8px 2px 0; color: var(--muted); font-size: 12px; text-align: center; }
.hero-shot-secondary { width: 205px; border: 8px solid #fff; box-shadow: var(--shadow); transform: translateY(24px); }
.media-index { position: absolute; top: 12px; right: 0; bottom: 12px; display: flex; flex-direction: column; justify-content: space-between; color: #789095; font-size: 12px; }

.section { padding: 86px 0; }
.section-inner, .download-inner, .footer-inner, .inner-main { width: min(calc(100% - 40px), var(--container)); margin: 0 auto; }
.section-heading { display: grid; grid-template-columns: 60px minmax(180px, auto) 1fr; align-items: end; gap: 20px; margin-bottom: 42px; }
.section-number { color: var(--coral); font-size: 13px; font-weight: 800; }
.section-heading h2 { margin: 0; font-size: 32px; line-height: 1.25; }
.section-note { max-width: 560px; justify-self: end; color: var(--muted); }
.preview-section { background: #fff; }
.preview-grid { display: grid; grid-template-columns: 1.15fr 1fr 1fr; gap: 24px; align-items: end; }
.preview-card { margin: 0; padding: 22px; background: var(--soft); border: 1px solid var(--line); border-radius: var(--radius); }
.preview-card img { width: min(100%, 230px); max-width: 400px; margin: 0 auto; box-shadow: 0 10px 25px rgba(31, 72, 74, 0.1); }
.preview-card.featured img { width: min(100%, 255px); }
.preview-card figcaption { display: grid; gap: 4px; margin-top: 18px; }
.preview-card figcaption span { color: var(--muted); font-size: 14px; }
.feature-section { background: var(--soft); border-block: 1px solid var(--line); }
.feature-list { border-top: 1px solid var(--line); }
.feature-list article { display: grid; grid-template-columns: 70px 1fr; gap: 24px; padding: 28px 0; border-bottom: 1px solid var(--line); }
.feature-list article > span { color: var(--coral); font-weight: 800; }
.feature-list h3 { margin: 0 0 4px; font-size: 20px; }
.feature-list article div div { color: var(--muted); }
.route-grid { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 80px; }
.route-intro h2 { margin: 12px 0; font-size: 34px; }
.route-intro div { color: var(--muted); }
.route-links { display: grid; gap: 16px; }
.route-links a { display: flex; justify-content: space-between; gap: 20px; padding: 24px; border: 1px solid var(--line); border-radius: var(--radius); }
.route-links a:hover { border-color: var(--teal); }
.route-links strong { color: var(--teal); }
.faq-preview { padding-top: 30px; }
.question-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.question-grid a { min-height: 150px; padding: 24px; display: flex; flex-direction: column; justify-content: space-between; background: var(--soft); border: 1px solid var(--line); border-radius: var(--radius); }
.question-grid b { color: var(--coral); font-size: 13px; }
.download-band { color: #fff; background: var(--teal); }
.download-inner { min-height: 210px; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.download-inner span { color: #c6e4df; }
.download-inner h2 { margin: 4px 0 0; font-size: 32px; }

.site-footer { padding: 48px 0; background: #102e33; color: #d9e7e8; text-align: center; }
.footer-inner { display: grid; justify-items: center; gap: 16px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 800; }
.footer-brand img { border-radius: 6px; }
.site-footer nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 22px; }
.site-footer p { max-width: 760px; margin: 0; color: #afc5c8; }
.site-footer small { color: #829da1; }

.inner-main { padding-bottom: 80px; }
.inner-hero { min-height: 520px; display: grid; grid-template-columns: 1fr 330px; align-items: center; gap: 80px; padding: 56px 70px; background: var(--soft); border-inline: 1px solid var(--line); }
.inner-hero h1, .faq-hero h1 { margin: 14px 0; font-size: 44px; line-height: 1.2; }
.inner-hero-copy > div:not(.eyebrow) { max-width: 650px; color: var(--muted); font-size: 17px; }
.inner-hero .button { margin-top: 24px; }
.inner-hero > img { width: 210px; max-width: 400px; justify-self: center; border: 8px solid #fff; box-shadow: var(--shadow); }
.guide-layout { display: grid; grid-template-columns: 230px 1fr; gap: 70px; padding: 80px 0; }
.guide-index { position: sticky; top: 104px; height: max-content; display: grid; gap: 12px; padding: 22px; background: var(--soft); border: 1px solid var(--line); border-radius: var(--radius); }
.guide-index a { color: var(--muted); font-size: 14px; }
.guide-index a:hover { color: var(--teal); }
.guide-content { display: grid; gap: 60px; }
.guide-content article { scroll-margin-top: 100px; }
.guide-content article > span { color: var(--coral); font-weight: 800; }
.guide-content h2 { margin: 6px 0 16px; font-size: 30px; }
.guide-content p { color: #465f64; }
.guide-content a { color: var(--teal); text-decoration: underline; }
.inner-cta { min-height: 170px; padding: 34px 44px; display: flex; align-items: center; justify-content: space-between; gap: 30px; color: #fff; background: var(--teal); border-radius: var(--radius); }
.inner-cta h2 { margin: 0; }
.faq-main { padding-top: 52px; }
.faq-hero { max-width: 800px; margin: 0 auto 54px; text-align: center; }
.faq-hero > div:not(.eyebrow) { color: var(--muted); font-size: 17px; }
.faq-hero .button { margin-top: 22px; }
.faq-list { max-width: 900px; margin: 0 auto; border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item button { width: 100%; padding: 22px 0; display: flex; align-items: center; justify-content: space-between; gap: 20px; color: var(--ink); background: transparent; border: 0; text-align: left; cursor: pointer; }
.faq-item button b { margin-right: 18px; color: var(--coral); }
.faq-item button i { color: var(--teal); font-style: normal; font-size: 24px; }
.faq-answer { display: none; padding: 0 50px 22px; color: var(--muted); }
.faq-answer p { margin: 0; }
.faq-item.open .faq-answer { display: block; }
.faq-item.open button i { transform: rotate(45deg); }
.faq-help { max-width: 900px; margin: 76px auto 0; padding: 40px 60px; display: grid; grid-template-columns: 180px 1fr; align-items: center; gap: 60px; background: var(--soft); border: 1px solid var(--line); border-radius: var(--radius); }
.faq-help img { width: 150px; max-width: 400px; box-shadow: var(--shadow); }
.faq-help h2 { margin: 0 0 8px; }
.faq-help p { color: var(--muted); }
.faq-help a { color: var(--teal); font-weight: 800; }

@media (max-width: 860px) {
    .header-inner { width: min(calc(100% - 28px), var(--container)); min-height: 64px; }
    .brand img { width: 38px; height: 38px; }
    .menu-toggle { display: block; }
    .main-nav { position: absolute; top: 64px; left: 14px; right: 14px; display: none; padding: 18px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
    .main-nav.open { display: grid; gap: 12px; }
    .main-nav .nav-download { text-align: center; }
    .hero { background: var(--soft); }
    .hero-inner { width: min(calc(100% - 28px), var(--container)); min-height: 0; grid-template-columns: 1fr; gap: 22px; padding: 34px 0 28px; }
    .hero h1 { margin: 10px 0 12px; font-size: 35px; }
    .hero-lead { font-size: 15px; }
    .hero-actions { margin-top: 18px; }
    .hero-points { display: none; }
    .hero-media { height: 260px; justify-content: center; gap: 14px; overflow: hidden; }
    .hero-shot { padding: 6px; }
    .hero-shot img { width: 128px; }
    .hero-shot figcaption { display: none; }
    .hero-shot-secondary { width: 116px; border-width: 5px; transform: translateY(10px); }
    .media-index { display: none; }
    .section { padding: 58px 0; }
    .section-inner, .download-inner, .footer-inner, .inner-main { width: min(calc(100% - 28px), var(--container)); }
    .section-heading { grid-template-columns: 36px 1fr; gap: 10px; margin-bottom: 28px; }
    .section-heading h2 { font-size: 27px; }
    .section-note { grid-column: 2; justify-self: start; }
    .preview-grid { grid-template-columns: 1fr; }
    .preview-card { display: grid; grid-template-columns: 120px 1fr; align-items: center; gap: 18px; }
    .preview-card img, .preview-card.featured img { width: 112px; }
    .preview-card figcaption { margin: 0; }
    .feature-list article { grid-template-columns: 42px 1fr; gap: 12px; }
    .route-grid, .question-grid { grid-template-columns: 1fr; gap: 18px; }
    .route-links a { align-items: flex-start; flex-direction: column; }
    .download-inner { min-height: 220px; padding: 30px 0; flex-direction: column; align-items: flex-start; justify-content: center; }
    .download-inner h2 { font-size: 27px; }
    .inner-main { padding-bottom: 56px; }
    .inner-hero { min-height: 0; grid-template-columns: 1fr; gap: 30px; padding: 42px 22px; }
    .inner-hero h1, .faq-hero h1 { font-size: 34px; }
    .inner-hero > img { width: 160px; }
    .guide-layout { grid-template-columns: 1fr; gap: 34px; padding: 54px 0; }
    .guide-index { position: static; }
    .inner-cta { padding: 30px; flex-direction: column; align-items: flex-start; }
    .faq-main { padding-top: 40px; }
    .faq-answer { padding-left: 0; padding-right: 24px; }
    .faq-help { padding: 30px; grid-template-columns: 1fr; gap: 24px; }
    .faq-help img { width: 130px; }
}

@media (max-width: 420px) {
    .hero h1, .inner-hero h1, .faq-hero h1 { font-size: 28px; }
    .button { padding-inline: 17px; }
    .preview-card { grid-template-columns: 98px 1fr; padding: 16px; }
    .preview-card img, .preview-card.featured img { width: 94px; }
}