:root {
    --bg: #F4FBFF;
    --surface: #FFFFFF;
    --soft: #E8F7FF;
    --primary: #10AEEA;
    --blue: #1688D8;
    --deep: #155A9D;
    --text: #24384A;
    --muted: #60758A;
    --border: rgba(16, 174, 234, 0.18);
    --gradient: linear-gradient(135deg, #35D7FF 0%, #1688D8 100%);
    --footer: #073A68;
    --shadow: 0 18px 45px rgba(21, 90, 157, 0.12);
    --radius: 22px;
    --header-height: 76px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    min-width: 320px;
    overflow-x: hidden;
    background: var(--bg);
    color: var(--text);
    font-family: "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.75;
}
body.drawer-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button { cursor: pointer; }
.container { width: min(100% - 32px, 1180px); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 2000; padding: 10px 16px; border-radius: 10px; background: var(--deep); color: #fff; transition: top .2s ease; }
.skip-link:focus { top: 12px; }

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 28px rgba(21, 90, 157, 0.08);
    backdrop-filter: blur(14px);
}
.header-inner {
    width: min(100% - 32px, 1360px);
    height: 100%;
    margin-inline: auto;
    display: flex;
    align-items: center;
    gap: clamp(12px, 1.5vw, 24px);
    min-width: 0;
}
.brand-logo { flex: 0 0 auto; width: clamp(106px, 9vw, 136px); }
.brand-logo img { width: 100%; height: 44px; object-fit: contain; }
.desktop-nav {
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(5px, .75vw, 12px);
    overflow: hidden;
}
.desktop-nav a {
    flex: 0 0 auto;
    white-space: nowrap;
    padding: 8px clamp(4px, .35vw, 7px);
    border-radius: 9px;
    color: var(--text);
    font-size: clamp(12px, .92vw, 14px);
    font-weight: 650;
    transition: color .2s ease, background .2s ease;
}
.desktop-nav a:hover, .desktop-nav a.active { color: var(--blue); background: var(--soft); }
.header-actions { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.main-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 22px;
    border-radius: 999px;
    background: var(--gradient);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 10px 22px rgba(22, 136, 216, .25);
    white-space: nowrap;
    transition: transform .2s ease, box-shadow .2s ease;
}
.main-btn:hover { transform: translateY(-2px); box-shadow: 0 14px 28px rgba(22, 136, 216, .3); }
.menu-toggle { display: none; width: 44px; height: 44px; border: 1px solid var(--border); border-radius: 13px; background: #fff; padding: 10px; }
.menu-toggle span { display: block; height: 2px; margin: 5px 0; border-radius: 2px; background: var(--deep); }

.drawer-backdrop { position: fixed; inset: 0; z-index: 1100; background: rgba(7, 58, 104, .42); opacity: 0; transition: opacity .22s ease; }
.drawer-backdrop.show { opacity: 1; }
.mobile-drawer { position: fixed; top: 0; right: 0; z-index: 1200; width: min(88vw, 360px); height: 100dvh; padding: 20px; background: #fff; transform: translateX(105%); transition: transform .25s ease; overflow-y: auto; box-shadow: -18px 0 45px rgba(7, 58, 104, .18); }
.mobile-drawer.open { transform: translateX(0); }
.drawer-head { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.drawer-logo { width: 132px; }
.drawer-logo img { width: 100%; height: 46px; object-fit: contain; }
.drawer-close { width: 42px; height: 42px; border: 0; border-radius: 12px; background: var(--soft); color: var(--deep); font-size: 30px; line-height: 1; }
.mobile-nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; padding: 20px 0; }
.mobile-nav a { padding: 11px 12px; border: 1px solid var(--border); border-radius: 12px; background: #fff; color: var(--text); text-align: center; font-weight: 700; }
.mobile-nav a.active { color: var(--blue); background: var(--soft); }
.drawer-register { width: 100%; }

main { min-height: 60vh; }
.section { padding: clamp(56px, 7vw, 96px) 0; }
.section.soft { background: var(--soft); }
.section-title { max-width: 760px; margin: 0 auto 34px; text-align: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 10px; color: var(--blue); font-size: 14px; font-weight: 800; letter-spacing: .08em; }
.eyebrow::before { content: ""; width: 26px; height: 3px; border-radius: 99px; background: var(--gradient); }
h1, h2, h3 { margin-top: 0; color: var(--deep); line-height: 1.3; }
h1 { margin-bottom: 18px; font-size: clamp(32px, 5vw, 58px); letter-spacing: -.03em; }
h2 { margin-bottom: 14px; font-size: clamp(25px, 3vw, 38px); }
h3 { margin-bottom: 10px; font-size: clamp(18px, 2vw, 23px); }
p { margin-top: 0; }
.lead { color: var(--muted); font-size: clamp(17px, 2vw, 20px); }
.text-link { display: inline-flex; align-items: center; gap: 6px; color: var(--blue); font-weight: 800; }
.text-link::after { content: "→"; transition: transform .2s ease; }
.text-link:hover::after { transform: translateX(4px); }
.button-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.secondary-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 42px; padding: 0 22px; border: 1px solid var(--border); border-radius: 999px; background: #fff; color: var(--deep); font-weight: 800; }

.page-hero { padding: clamp(52px, 7vw, 92px) 0; background: radial-gradient(circle at 10% 10%, rgba(53, 215, 255, .25), transparent 36%), linear-gradient(180deg, #fff 0%, var(--bg) 100%); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr); align-items: center; gap: clamp(28px, 5vw, 72px); }
.hero-copy { max-width: 680px; }
.hero-media { overflow: hidden; border: 1px solid var(--border); border-radius: 28px; background: #fff; box-shadow: var(--shadow); }
.hero-media img { width: 100%; aspect-ratio: 16 / 10; object-fit: contain; background: var(--soft); }

.carousel-wrap { padding: clamp(20px, 3vw, 34px) 0 0; }
.carousel { position: relative; width: min(100% - 32px, 1360px); margin-inline: auto; overflow: hidden; border: 1px solid var(--border); border-radius: clamp(16px, 2.2vw, 30px); background: var(--soft); box-shadow: var(--shadow); aspect-ratio: 16 / 6.8; }
.carousel-track { height: 100%; display: flex; transition: transform .55s ease; }
.carousel-slide { flex: 0 0 100%; height: 100%; }
.carousel-slide img { width: 100%; height: 100%; object-fit: contain; background: var(--soft); }
.carousel-arrow { position: absolute; top: 50%; z-index: 3; width: 46px; height: 46px; border: 1px solid rgba(255,255,255,.85); border-radius: 50%; background: rgba(7,58,104,.55); color: #fff; font-size: 27px; transform: translateY(-50%); backdrop-filter: blur(8px); }
.carousel-arrow.prev { left: 16px; }
.carousel-arrow.next { right: 16px; }
.carousel-dots { position: absolute; left: 50%; bottom: 14px; z-index: 3; display: flex; gap: 8px; transform: translateX(-50%); }
.carousel-dot { width: 9px; height: 9px; padding: 0; border: 0; border-radius: 50%; background: rgba(255,255,255,.65); box-shadow: 0 0 0 1px rgba(7,58,104,.15); }
.carousel-dot.active { width: 28px; border-radius: 99px; background: #fff; }

.card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.card-grid.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.card { height: 100%; padding: clamp(22px, 3vw, 30px); border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); box-shadow: 0 12px 34px rgba(21,90,157,.08); }
.card p { color: var(--muted); }
.card-number { display: inline-grid; place-items: center; width: 42px; height: 42px; margin-bottom: 16px; border-radius: 13px; background: var(--soft); color: var(--blue); font-weight: 900; }
.media-card { overflow: hidden; padding: 0; }
.media-card img { width: 100%; aspect-ratio: 16 / 10; object-fit: contain; background: var(--soft); border-bottom: 1px solid var(--border); }
.media-card .card-body { padding: 24px; }
.feature-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, .9fr); align-items: center; gap: clamp(26px, 5vw, 66px); }
.feature-row.reverse .feature-media { order: -1; }
.feature-media { overflow: hidden; border: 1px solid var(--border); border-radius: 24px; background: #fff; box-shadow: var(--shadow); }
.feature-media img { width: 100%; aspect-ratio: 16 / 10; object-fit: contain; background: var(--soft); }
.check-list { display: grid; gap: 12px; margin: 22px 0 0; padding: 0; list-style: none; }
.check-list li { position: relative; padding-left: 30px; color: var(--text); }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 2px; display: grid; place-items: center; width: 20px; height: 20px; border-radius: 50%; background: var(--soft); color: var(--blue); font-size: 12px; font-weight: 900; }

.quick-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.quick-card { display: flex; flex-direction: column; min-height: 220px; padding: 24px; border: 1px solid var(--border); border-radius: 20px; background: #fff; box-shadow: 0 10px 28px rgba(21,90,157,.07); }
.quick-card p { flex: 1; color: var(--muted); }

.review-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.review-card { position: relative; padding: 26px; border: 1px solid var(--border); border-radius: 20px; background: #fff; box-shadow: 0 12px 32px rgba(21,90,157,.07); }
.review-card::before { content: "“"; position: absolute; top: 8px; right: 18px; color: rgba(16,174,234,.18); font-size: 64px; font-weight: 900; line-height: 1; }
.review-card p { position: relative; color: var(--text); }
.review-card strong { color: var(--deep); }

.notice-box { padding: 26px; border: 1px solid var(--border); border-radius: 20px; background: linear-gradient(135deg, #fff 0%, var(--soft) 100%); }
.notice-box h2, .notice-box h3 { color: var(--deep); }
.notice-box p:last-child { margin-bottom: 0; }
.info-strip { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.info-item { padding: 20px; border: 1px solid var(--border); border-radius: 16px; background: #fff; text-align: center; }
.info-item strong { display: block; margin-bottom: 6px; color: var(--deep); font-size: 18px; }
.info-item span { color: var(--muted); font-size: 14px; }

.faq-list { display: grid; gap: 14px; max-width: 920px; margin: 0 auto; }
details { border: 1px solid var(--border); border-radius: 16px; background: #fff; box-shadow: 0 8px 24px rgba(21,90,157,.05); }
summary { position: relative; padding: 20px 52px 20px 22px; color: var(--deep); font-weight: 800; cursor: pointer; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 20px; top: 50%; color: var(--blue); font-size: 24px; transform: translateY(-50%); }
details[open] summary::after { content: "−"; }
details p { padding: 0 22px 22px; color: var(--muted); }

.site-footer { padding: 64px 0 24px; background: var(--footer); color: #EAF8FF; }
.footer-grid { display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: 36px; }
.footer-brand img { width: 150px; height: 52px; object-fit: contain; filter: brightness(0) invert(1); }
.footer-brand p { max-width: 460px; margin-top: 18px; color: rgba(234,248,255,.78); }
.footer-column h2 { margin-bottom: 16px; color: #fff; font-size: 18px; }
.footer-column a { display: block; margin: 9px 0; color: rgba(234,248,255,.8); }
.footer-column a:hover { color: #fff; }
.footer-notice { margin-top: 36px; padding-top: 22px; border-top: 1px solid rgba(234,248,255,.18); color: rgba(234,248,255,.7); font-size: 14px; }
.footer-notice p { margin-bottom: 6px; }

@media (max-width: 1180px) {
    .desktop-nav { display: none; }
    .menu-toggle { display: block; }
    .header-inner { width: min(100% - 24px, 1100px); }
    .header-actions { margin-left: auto; }
}
@media (max-width: 960px) {
    .hero-grid, .feature-row { grid-template-columns: 1fr; }
    .hero-media { max-width: 720px; }
    .feature-row.reverse .feature-media { order: initial; }
    .card-grid, .card-grid.four, .quick-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .review-grid { grid-template-columns: 1fr; }
    .info-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
    :root { --header-height: 68px; }
    .container { width: min(100% - 24px, 1180px); }
    .header-inner { width: calc(100% - 20px); gap: 8px; }
    .brand-logo { width: 104px; }
    .brand-logo img { height: 38px; }
    .main-btn { min-height: 40px; padding: 0 17px; font-size: 14px; }
    .carousel { width: calc(100% - 24px); aspect-ratio: 16 / 10; }
    .carousel-arrow { width: 40px; height: 40px; font-size: 23px; }
    .carousel-arrow.prev { left: 10px; }
    .carousel-arrow.next { right: 10px; }
    .card-grid, .card-grid.four, .quick-grid, .info-strip, .footer-grid { grid-template-columns: 1fr; }
    .quick-card { min-height: auto; }
    .mobile-nav { grid-template-columns: 1fr 1fr; }
    .page-hero { padding-top: 42px; }
    .hero-media img, .feature-media img, .media-card img { aspect-ratio: 16 / 11; }
}