:root {
    --ink: #2e3133;
    --burgundy: #7f2940;
    --burgundy-dark: #631c31;
    --olive: #71814a;
    --cool: #f3f5f5;
    --paper: #ffffff;
    --line: #d9dddd;
    --muted: #666f72;
    --container: 1170px;
}
* { 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: 30; background: #fff; border-bottom: 1px solid var(--line); }
.header-inner { width: min(calc(100% - 40px), var(--container)); min-height: 72px; margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; }
.brand img { width: 42px; height: 42px; border-radius: 6px; }
.main-nav { display: flex; align-items: center; gap: 28px; color: #555f62; font-size: 14px; }
.main-nav a.active { color: var(--burgundy); font-weight: 800; }
.download-link { padding: 9px 18px; color: #fff; background: var(--burgundy); border-radius: 5px; }
.menu-toggle { display: none; width: 42px; height: 42px; color: var(--burgundy); background: #fff; border: 1px solid var(--line); border-radius: 5px; }
.hero { background: var(--cool); border-bottom: 1px solid var(--line); }
.hero-inner { width: min(calc(100% - 40px), var(--container)); min-height: 590px; margin: auto; display: grid; grid-template-columns: .9fr 1.1fr; align-items: center; gap: 62px; padding: 42px 0; }
.overline { color: var(--olive); font-size: 12px; font-weight: 800; }
.hero h1 { max-width: 530px; margin: 13px 0 18px; font-size: 49px; line-height: 1.16; letter-spacing: 0; }
.hero-copy p { max-width: 570px; margin: 0; color: var(--muted); font-size: 17px; }
.hero-actions { display: flex; 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: 5px; font-weight: 800; }
.button.primary { color: #fff; background: var(--burgundy); }
.button.primary:hover { background: var(--burgundy-dark); }
.button.quiet { background: #fff; border-color: var(--line); }
.button.light { color: var(--burgundy); background: #fff; }
.preview-dock { background: #fff; border: 1px solid var(--line); }
.dock-head { height: 52px; padding: 0 22px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.dock-head span { color: var(--muted); font-size: 13px; }
.dock-head b { color: var(--burgundy); }
.dock-body { height: 430px; display: grid; grid-template-columns: 1fr 165px; }
.dock-body > img { width: 225px; max-width: 400px; align-self: center; justify-self: center; border: 7px solid #fff; box-shadow: 0 12px 28px rgba(54,48,50,.12); }
.dock-body dl { margin: 0; padding: 30px 20px; display: grid; align-content: center; gap: 18px; background: #fafafa; border-left: 1px solid var(--line); }
.dock-body dl div { display: grid; grid-template-columns: 28px 1fr; gap: 8px; }
.dock-body dt { color: var(--olive); font-weight: 800; }
.dock-body dd { margin: 0; color: var(--muted); font-size: 13px; }
.facts-band { display: grid; grid-template-columns: repeat(4, 1fr); color: #fff; background: var(--burgundy); }
.facts-band div { min-height: 98px; padding: 21px 28px; display: grid; align-content: center; border-right: 1px solid rgba(255,255,255,.2); }
.facts-band span { color: #e7cbd3; font-size: 13px; }
.section { padding: 82px 0; }
.section-inner, .footer-inner, .guide-main, .faq-main { width: min(calc(100% - 40px), var(--container)); margin: auto; }
.section-heading { display: grid; grid-template-columns: 55px 1fr; align-items: end; margin-bottom: 34px; padding-bottom: 15px; border-bottom: 1px solid var(--line); }
.section-heading span { color: var(--olive); font-weight: 800; }
.section-heading h2 { margin: 0; font-size: 31px; }
.preview-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 23px; align-items: end; }
.preview-row figure { margin: 0; padding: 20px; background: var(--cool); border: 1px solid var(--line); }
.preview-row img { width: auto; height: 410px; max-width: 400px; margin: auto; object-fit: contain; }
.preview-row figcaption { display: grid; gap: 3px; margin-top: 14px; }
.preview-row figcaption span { color: var(--muted); font-size: 13px; }
.advantage-section { background: var(--cool); border-block: 1px solid var(--line); }
.advantage-grid { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.advantage-grid article { padding: 27px; background: #fff; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.advantage-grid h3 { margin: 0 0 7px; }
.advantage-grid article div { color: var(--muted); }
.help-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.help-grid a { min-height: 180px; padding: 28px; display: grid; align-content: space-between; border: 1px solid var(--line); }
.help-grid small { color: var(--olive); font-weight: 800; }
.help-grid b { font-size: 20px; }
.help-grid span { color: var(--burgundy); font-weight: 800; }
.download-section { width: min(calc(100% - 40px), var(--container)); min-height: 190px; margin: 0 auto 80px; padding: 38px 46px; display: flex; align-items: center; justify-content: space-between; gap: 30px; color: #fff; background: var(--burgundy); }
.download-section span { color: #d7b5bf; font-size: 12px; }
.download-section h2 { margin: 4px 0 0; font-size: 30px; }
footer { padding: 46px 0; color: #ded7d9; background: #30262a; text-align: center; }
.footer-inner { display: grid; justify-items: center; gap: 15px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; }
.footer-brand img { border-radius: 5px; }
.footer-inner nav { display: flex; gap: 22px; }
.footer-inner p { max-width: 760px; margin: 0; color: #bcaeb3; }
.footer-inner small { color: #8b7a80; }
.inner-hero { min-height: 520px; display: grid; grid-template-columns: 1fr 340px; align-items: center; gap: 70px; padding: 52px 70px; background: var(--cool); border-inline: 1px solid var(--line); }
.inner-hero h1, .faq-hero h1 { margin: 12px 0; font-size: 43px; line-height: 1.2; }
.inner-hero p, .faq-hero p { color: var(--muted); font-size: 17px; }
.inner-hero .button, .faq-hero .button { margin-top: 18px; }
.inner-hero img { width: 210px; max-width: 400px; justify-self: center; border: 7px solid #fff; box-shadow: 0 12px 28px rgba(54,48,50,.12); }
.handbook { display: grid; grid-template-columns: 220px 1fr; gap: 70px; padding: 75px 0; }
.handbook aside { position: sticky; top: 100px; height: max-content; display: grid; gap: 12px; padding: 22px; background: var(--cool); border: 1px solid var(--line); }
.handbook aside a { color: var(--muted); font-size: 14px; }
.handbook-content { display: grid; gap: 55px; }
.handbook-content article { scroll-margin-top: 100px; }
.handbook-content article > span { color: var(--olive); font-size: 12px; font-weight: 800; }
.handbook-content h2 { margin: 7px 0 13px; }
.handbook-content p { color: var(--muted); }
.handbook-content a { color: var(--burgundy); text-decoration: underline; }
.guide-cta { margin-bottom: 80px; padding: 34px 44px; display: flex; align-items: center; justify-content: space-between; color: #fff; background: var(--burgundy); }
.guide-cta h2 { margin: 0; }
.faq-main { padding-top: 54px; padding-bottom: 80px; }
.faq-hero { max-width: 780px; margin: 0 auto 46px; text-align: center; }
.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item button { width: 100%; padding: 21px 5px; display: grid; grid-template-columns: 55px 1fr 30px; align-items: center; color: var(--ink); background: #fff; border: 0; text-align: left; cursor: pointer; }
.faq-item button b { color: var(--olive); }
.faq-item button i { color: var(--burgundy); font-size: 22px; font-style: normal; }
.faq-item > div { display: none; padding: 0 60px 22px; color: var(--muted); }
.faq-item > div p { margin: 0; }
.faq-item.open > div { display: block; }
.faq-item.open i { transform: rotate(45deg); }
.faq-help { margin-top: 65px; padding: 32px 55px; display: grid; grid-template-columns: 150px 1fr; align-items: center; gap: 50px; background: var(--cool); border: 1px solid var(--line); }
.faq-help img { width: 125px; max-width: 400px; box-shadow: 0 10px 24px rgba(54,48,50,.1); }
.faq-help h2 { margin: 0; }
.faq-help p { color: var(--muted); }
.faq-help a { color: var(--burgundy); 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: 0 12px 28px rgba(54,48,50,.12); }
    .main-nav.open { display: grid; gap: 11px; }
    .download-link { text-align: center; }
    .hero-inner { width: min(calc(100% - 28px), var(--container)); min-height: 0; grid-template-columns: 1fr; gap: 22px; padding: 34px 0 28px; }
    .hero h1 { font-size: 34px; }
    .hero-copy p { font-size: 15px; }
    .dock-body { height: 285px; grid-template-columns: 1fr 120px; }
    .dock-body > img { width: 135px; border-width: 5px; }
    .dock-body dl { padding: 18px 12px; gap: 11px; }
    .facts-band { grid-template-columns: 1fr 1fr; }
    .facts-band div { min-height: 78px; padding: 15px 20px; border-bottom: 1px solid rgba(255,255,255,.2); }
    .section-inner, .footer-inner, .guide-main, .faq-main { width: min(calc(100% - 28px), var(--container)); }
    .section { padding: 56px 0; }
    .section-heading h2 { font-size: 27px; }
    .preview-row { grid-template-columns: 1fr; }
    .preview-row figure { display: grid; grid-template-columns: 115px 1fr; align-items: center; gap: 20px; }
    .preview-row img { width: 105px; height: 205px; }
    .preview-row figcaption { margin: 0; }
    .advantage-grid, .help-grid { grid-template-columns: 1fr; }
    .download-section { width: min(calc(100% - 28px), var(--container)); margin-bottom: 56px; padding: 30px; flex-direction: column; align-items: flex-start; }
    .inner-hero { min-height: 0; grid-template-columns: 1fr; gap: 26px; padding: 38px 28px; }
    .inner-hero h1, .faq-hero h1 { font-size: 32px; }
    .inner-hero img { width: 130px; }
    .handbook { grid-template-columns: 1fr; gap: 38px; padding: 50px 0; }
    .handbook aside { position: static; }
    .guide-cta { padding: 28px; flex-direction: column; align-items: flex-start; gap: 20px; }
    .faq-main { padding-top: 40px; }
    .faq-item button { grid-template-columns: 40px 1fr 24px; }
    .faq-item > div { padding-left: 40px; padding-right: 10px; }
    .faq-help { padding: 28px; grid-template-columns: 1fr; gap: 20px; }
    .faq-help img { width: 110px; }
}
@media (max-width: 420px) {
    .hero h1, .inner-hero h1, .faq-hero h1 { font-size: 29px; }
    .dock-body { grid-template-columns: 1fr 110px; }
    .dock-body dd { font-size: 11px; }
}