:root {
    --bg: #F4FBFF;
    --surface: #FFFFFF;
    --soft: #E8F7FF;
    --primary: #11AEEA;
    --accent: #1688D8;
    --deep: #155A9D;
    --text: #24384A;
    --muted: #60758A;
    --line: rgba(17, 174, 234, 0.18);
    --footer: #073A68;
    --shadow: 0 18px 46px rgba(21, 90, 157, 0.10);
    --shadow-sm: 0 10px 28px rgba(21, 90, 157, 0.08);
    --radius: 22px;
    --header-h: 76px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    min-width: 320px;
    overflow-x: hidden;
    color: var(--text);
    background: var(--bg);
    font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}
body.drawer-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 9999; padding: 10px 16px; border-radius: 10px; color: #fff; background: var(--accent); }
.skip-link:focus { top: 12px; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-h);
    background: rgba(255,255,255,.95);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(16px);
}
.header-inner {
    width: min(100% - 32px, 1360px);
    height: 100%;
    margin-inline: auto;
    display: flex;
    align-items: center;
    gap: clamp(12px, 1.4vw, 24px);
}
.brand-logo { flex: 0 0 auto; width: clamp(105px, 9vw, 138px); }
.brand-logo img, .drawer-logo img, .footer-brand img { width: 100%; height: auto; object-fit: contain; }
.desktop-nav {
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(5px, .75vw, 13px);
    overflow: hidden;
}
.desktop-nav a {
    flex: 0 1 auto;
    min-width: 0;
    padding: 9px clamp(4px, .35vw, 7px);
    color: #31546f;
    font-size: clamp(12px, .85vw, 14px);
    font-weight: 700;
    white-space: nowrap;
    border-radius: 10px;
    transition: .2s ease;
}
.desktop-nav a:hover, .desktop-nav a.active { color: var(--accent); background: var(--soft); }
.main-btn {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 78px;
    min-height: 42px;
    padding: 10px 22px;
    border: 0;
    border-radius: 999px;
    color: #fff;
    background: linear-gradient(135deg, #35D7FF 0%, #1688D8 100%);
    box-shadow: 0 10px 22px rgba(22, 136, 216, .20);
    font-weight: 800;
    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, .28); }
.menu-toggle { display: none; flex: 0 0 auto; width: 44px; height: 44px; padding: 10px; border: 1px solid var(--line); border-radius: 12px; background: #fff; cursor: pointer; }
.menu-toggle span { display: block; width: 100%; height: 2px; margin: 5px 0; border-radius: 2px; background: var(--deep); }
.mobile-drawer {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 1200;
    width: min(88vw, 380px);
    height: 100dvh;
    padding: 18px;
    overflow-y: auto;
    background: #fff;
    box-shadow: -22px 0 50px rgba(7,58,104,.18);
    transform: translateX(105%);
    transition: transform .28s ease;
}
.mobile-drawer.open { transform: translateX(0); }
.drawer-backdrop { position: fixed; inset: 0; z-index: 1100; background: rgba(7,58,104,.38); }
.drawer-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.drawer-logo { width: 120px; }
.drawer-close { width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 12px; color: var(--deep); background: var(--soft); font-size: 28px; line-height: 1; cursor: pointer; }
.drawer-nav { display: grid; gap: 6px; padding: 18px 0; }
.drawer-nav a { padding: 12px 14px; border-radius: 12px; color: #31546f; font-weight: 700; }
.drawer-nav a:hover, .drawer-nav a.active { color: var(--accent); background: var(--soft); }
.drawer-register { width: 100%; }
.container { width: min(100% - 32px, 1240px); margin-inline: auto; }
main { min-height: 70vh; }
.section { padding: clamp(54px, 6vw, 92px) 0; }
.section-tight { padding: clamp(34px, 4vw, 58px) 0; }
.section-soft { background: linear-gradient(180deg, rgba(232,247,255,.8), rgba(244,251,255,.35)); }
.page-hero { padding: clamp(64px, 8vw, 112px) 0 clamp(42px, 5vw, 72px); background: radial-gradient(circle at 80% 10%, rgba(53,215,255,.22), transparent 32%), linear-gradient(180deg, #edfaff, var(--bg)); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr); align-items: center; gap: clamp(30px, 6vw, 74px); }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 14px; color: var(--accent); font-size: 14px; font-weight: 900; letter-spacing: .08em; }
.eyebrow::before { content: ""; width: 28px; height: 3px; border-radius: 99px; background: linear-gradient(90deg, #35D7FF, #1688D8); }
h1, h2, h3 { margin: 0 0 16px; color: var(--deep); line-height: 1.28; }
h1 { font-size: clamp(34px, 5vw, 62px); letter-spacing: -.03em; }
h2 { font-size: clamp(26px, 3.2vw, 42px); }
h3 { font-size: clamp(19px, 2vw, 24px); }
p { margin: 0 0 16px; }
.lead { max-width: 760px; color: #405d74; font-size: clamp(17px, 1.55vw, 20px); }
.hero-actions, .card-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.text-link { display: inline-flex; align-items: center; gap: 7px; color: var(--accent); font-weight: 800; }
.text-link::after { content: "→"; transition: transform .2s ease; }
.text-link:hover::after { transform: translateX(4px); }
.secondary-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 42px; padding: 10px 20px; border: 1px solid var(--line); border-radius: 999px; color: var(--deep); background: #fff; font-weight: 800; }
.hero-media, .content-media { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); }
.hero-media img, .content-media img { width: 100%; height: auto; object-fit: contain; }
.section-head { max-width: 780px; margin-bottom: 34px; }
.section-head.center { margin-inline: auto; text-align: center; }
.section-head p { color: var(--muted); }
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.card { min-width: 0; padding: clamp(22px, 2.6vw, 32px); border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow-sm); }
.card p { color: var(--muted); }
.card .tag, .tag { display: inline-flex; margin-bottom: 14px; padding: 6px 11px; border-radius: 999px; color: var(--accent); background: var(--soft); font-size: 13px; font-weight: 900; }
.card-media { padding: 0; overflow: hidden; }
.card-media img { width: 100%; height: auto; object-fit: contain; background: #fff; }
.card-media .card-body { padding: clamp(22px, 2.6vw, 30px); }
.split { display: grid; grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr); align-items: center; gap: clamp(28px, 5vw, 64px); }
.split.reverse > :first-child { order: 2; }
.feature-list { display: grid; gap: 14px; margin: 22px 0 0; padding: 0; list-style: none; }
.feature-list li { position: relative; padding-left: 28px; color: #405d74; }
.feature-list li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--primary); font-weight: 900; }
.notice { padding: 24px 26px; border: 1px solid var(--line); border-left: 4px solid var(--primary); border-radius: 16px; background: #fff; box-shadow: var(--shadow-sm); }
.notice strong { color: var(--deep); }
.review-card blockquote { margin: 0 0 18px; color: #405d74; }
.review-card footer { color: var(--accent); font-weight: 900; }
.faq-list { display: grid; gap: 14px; }
details { border: 1px solid var(--line); border-radius: 16px; background: #fff; box-shadow: var(--shadow-sm); }
summary { position: relative; padding: 20px 52px 20px 22px; color: var(--deep); font-weight: 900; cursor: pointer; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 22px; top: 50%; transform: translateY(-50%); color: var(--accent); font-size: 24px; }
details[open] summary::after { content: "−"; }
details p { padding: 0 22px 20px; color: var(--muted); }
.quick-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 16px; }
.quick-item { padding: 22px; border: 1px solid var(--line); border-radius: 18px; background: #fff; box-shadow: var(--shadow-sm); }
.quick-item h3 { font-size: 18px; }
.quick-item p { min-height: 6.9em; color: var(--muted); font-size: 14px; }
.carousel-wrap { padding: 26px 0 8px; }
.carousel { position: relative; width: min(100% - 32px, 1360px); margin-inline: auto; overflow: hidden; border: 1px solid var(--line); border-radius: clamp(18px, 2.5vw, 30px); background: var(--soft); box-shadow: var(--shadow); }
.carousel-track { display: flex; transition: transform .55s cubic-bezier(.2,.7,.2,1); will-change: transform; }
.carousel-slide { flex: 0 0 100%; min-width: 100%; background: var(--soft); }
.carousel-slide img { width: 100%; height: clamp(230px, 43vw, 610px); object-fit: contain; }
.carousel-arrow { position: absolute; top: 50%; z-index: 3; width: 46px; height: 46px; border: 1px solid rgba(255,255,255,.55); border-radius: 50%; color: #fff; background: rgba(7,58,104,.48); box-shadow: 0 8px 18px rgba(7,58,104,.18); transform: translateY(-50%); cursor: pointer; }
.carousel-prev { left: 18px; }
.carousel-next { right: 18px; }
.carousel-dots { position: absolute; left: 50%; bottom: 16px; z-index: 3; display: flex; gap: 9px; transform: translateX(-50%); }
.carousel-dot { width: 10px; height: 10px; padding: 0; border: 1px solid rgba(255,255,255,.75); border-radius: 50%; background: rgba(255,255,255,.45); cursor: pointer; transition: .2s ease; }
.carousel-dot.active { width: 28px; border-radius: 999px; background: #fff; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.stat { padding: 22px; border-radius: 18px; text-align: center; background: var(--soft); }
.stat strong { display: block; margin-bottom: 4px; color: var(--accent); font-size: 26px; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
table { width: 100%; border-collapse: collapse; min-width: 680px; }
th, td { padding: 15px 18px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--deep); background: var(--soft); }
.form-card label { display: block; margin-bottom: 7px; color: var(--deep); font-weight: 800; }
.form-card input, .form-card select, .form-card textarea { width: 100%; margin-bottom: 16px; padding: 13px 14px; border: 1px solid var(--line); border-radius: 12px; color: var(--text); background: #fff; outline: none; }
.form-card input:focus, .form-card select:focus, .form-card textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(17,174,234,.10); }
.site-footer { color: #EAF8FF; background: var(--footer); }
.footer-inner { width: min(100% - 32px, 1240px); margin-inline: auto; padding: 58px 0 38px; display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: 34px; }
.footer-inner h2 { margin-bottom: 14px; color: #fff; font-size: 18px; }
.footer-inner a { display: block; width: fit-content; margin: 8px 0; color: #d7efff; }
.footer-inner a:hover { color: #fff; }
.footer-inner p { color: #bcdff4; font-size: 14px; }
.footer-brand img { width: 132px; margin-bottom: 18px; filter: brightness(0) invert(1); }
.footer-bottom { padding: 18px 16px; border-top: 1px solid rgba(255,255,255,.12); color: #bcdff4; text-align: center; font-size: 13px; }
@media (max-width: 1179px) {
    .desktop-nav { display: none; }
    .header-inner { gap: 12px; }
    .brand-logo { margin-right: auto; }
    .menu-toggle { display: block; }
    .header-inner > .main-btn { min-width: 72px; padding-inline: 18px; }
}
@media (max-width: 960px) {
    .hero-grid, .split, .grid-4, .quick-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .split.reverse > :first-child { order: initial; }
    .footer-inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 680px) {
    :root { --header-h: 68px; }
    .header-inner, .container, .carousel { width: min(100% - 24px, 1240px); }
    .brand-logo { width: 102px; }
    .header-inner > .main-btn { min-width: 68px; min-height: 40px; padding: 8px 14px; }
    .menu-toggle { width: 40px; height: 40px; }
    .hero-grid, .split, .grid-2, .grid-3, .grid-4, .quick-grid, .stats, .footer-inner { grid-template-columns: 1fr; }
    .page-hero { padding-top: 50px; }
    .hero-media { order: -1; }
    .quick-item p { min-height: 0; }
    .carousel-wrap { padding-top: 14px; }
    .carousel-slide img { height: clamp(190px, 59vw, 390px); }
    .carousel-arrow { width: 40px; height: 40px; }
    .carousel-prev { left: 10px; }
    .carousel-next { right: 10px; }
    .carousel-dots { bottom: 10px; }
    .footer-inner { padding-top: 44px; }
}
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}