:root {
    --blue: #8fd3ff;
    --blue-deep: #3978a8;
    --yellow: #fff2b8;
    --orange: #ffb36b;
    --orange-deep: #e37a3d;
    --cream: #fffaf0;
    --white: #ffffff;
    --ink: #234052;
    --muted: #657987;
    --line: rgba(57, 120, 168, 0.18);
    --shadow: 0 18px 45px rgba(57, 120, 168, 0.13);
    --radius: 28px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    background: linear-gradient(180deg, #f5fbff 0%, #fffaf0 42%, #ffffff 100%);
    line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, textarea, select { font: inherit; }
.container { width: min(1160px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; min-height: 76px; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; }
.brand-mark {
    width: 50px;
    height: 50px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 18px;
    background: linear-gradient(135deg, var(--blue), var(--yellow));
    color: #17516f;
    box-shadow: 0 10px 24px rgba(143, 211, 255, 0.35);
}
.brand-text { color: var(--blue-deep); white-space: nowrap; }
.site-nav { display: flex; align-items: center; gap: 6px; }
.site-nav a {
    padding: 10px 14px;
    border-radius: 999px;
    color: #365567;
    font-weight: 700;
}
.site-nav a:hover, .site-nav a.active { background: #e9f6ff; color: var(--blue-deep); }
.nav-toggle { display: none; border: 0; border-radius: 999px; padding: 10px 16px; background: var(--yellow); color: var(--ink); font-weight: 800; }
.hero {
    padding: 74px 0 56px;
    overflow: hidden;
}
.hero-grid { display: grid; grid-template-columns: 1.02fr 0.98fr; gap: 38px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; padding: 7px 13px; border-radius: 999px; background: #fff6ce; color: #a2601a; font-weight: 800; font-size: 14px; }
.hero h1, .page-hero h1 { margin: 18px 0 18px; font-size: clamp(36px, 5vw, 64px); line-height: 1.08; letter-spacing: -0.04em; }
.hero p, .page-hero p { color: var(--muted); font-size: 18px; margin: 0 0 24px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 28px 0; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 12px 20px; border-radius: 999px; font-weight: 800; border: 1px solid transparent; cursor: pointer; }
.btn.primary { background: linear-gradient(135deg, var(--orange), #ffd18b); color: #5f310f; box-shadow: 0 12px 24px rgba(255, 179, 107, 0.25); }
.btn.secondary { background: var(--white); color: var(--blue-deep); border-color: var(--line); }
.btn.soft { background: #eaf7ff; color: var(--blue-deep); }
.hero-stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 18px; }
.stat { background: rgba(255, 255, 255, 0.72); border: 1px solid var(--line); border-radius: 22px; padding: 16px; }
.stat strong { display: block; font-size: 22px; color: var(--blue-deep); }
.hero-art { position: relative; }
.hero-card { background: var(--white); border-radius: 38px; padding: 18px; box-shadow: var(--shadow); border: 1px solid var(--line); transform: rotate(1deg); }
.float-note { position: absolute; right: 2%; bottom: 7%; background: var(--yellow); border-radius: 22px; padding: 16px; max-width: 240px; box-shadow: var(--shadow); font-weight: 700; }
.section { padding: 68px 0; }
.section.alt { background: rgba(255, 255, 255, 0.55); }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 28px; }
.section-title { margin: 0; font-size: clamp(26px, 3.4vw, 42px); line-height: 1.18; }
.section-intro { color: var(--muted); max-width: 650px; margin: 10px 0 0; }
.grid { display: grid; gap: 20px; }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: 0 14px 35px rgba(57, 120, 168, 0.08); }
.card.highlight { background: linear-gradient(160deg, #ffffff, #fff7d8); }
.card h3 { margin: 12px 0 8px; font-size: 22px; }
.card p { margin: 0; color: var(--muted); }
.card img { border-radius: 22px; background: #f4fbff; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 0; }
.tag { display: inline-flex; align-items: center; border-radius: 999px; padding: 6px 10px; background: #eaf7ff; color: var(--blue-deep); font-weight: 700; font-size: 13px; }
.tag.orange { background: #fff0e1; color: #a45d22; }
.tag.yellow { background: #fff7ce; color: #735d13; }
.feature-list { display: grid; gap: 14px; padding: 0; margin: 0; list-style: none; }
.feature-list li { display: flex; gap: 12px; background: rgba(255,255,255,0.72); border: 1px solid var(--line); border-radius: 20px; padding: 14px; }
.feature-list span { width: 30px; height: 30px; flex: 0 0 auto; border-radius: 12px; background: var(--yellow); display: inline-flex; align-items: center; justify-content: center; font-weight: 900; color: #a2601a; }
.ribbon { display: inline-block; padding: 7px 12px; background: var(--yellow); color: #8a5b00; border-radius: 999px; font-weight: 800; font-size: 13px; }
.video-card { overflow: hidden; padding: 0; }
.video-card .content { padding: 22px; }
.video-thumb { position: relative; overflow: hidden; border-radius: 27px 27px 0 0; background: #eef8ff; }
.play-badge { position: absolute; left: 18px; bottom: 18px; padding: 8px 12px; border-radius: 999px; background: rgba(255,255,255,0.88); color: var(--blue-deep); font-weight: 900; }
.steps { counter-reset: steps; display: grid; gap: 16px; }
.step { position: relative; padding-left: 62px; }
.step:before { counter-increment: steps; content: counter(steps); position: absolute; left: 0; top: 0; width: 42px; height: 42px; display: inline-flex; align-items: center; justify-content: center; border-radius: 16px; background: var(--orange); color: #fff; font-weight: 900; }
.page-hero { padding: 70px 0 38px; }
.page-hero .panel { background: linear-gradient(135deg, #eaf7ff, #fff7d1); border: 1px solid var(--line); border-radius: 38px; padding: clamp(28px, 5vw, 56px); }
.split { display: grid; grid-template-columns: 0.95fr 1.05fr; gap: 28px; align-items: center; }
.age-filter { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 22px; }
.age-filter button { border: 0; border-radius: 999px; padding: 10px 16px; background: #fff; color: var(--blue-deep); font-weight: 800; cursor: pointer; }
.age-filter button.active { background: var(--blue); color: #173c51; }
.notice { background: #fff8d8; border: 1px solid rgba(255, 179, 107, 0.35); border-radius: 24px; padding: 18px; color: #73521b; }
.quote { font-size: 18px; color: var(--ink); }
.quote footer { margin-top: 12px; color: var(--muted); font-weight: 700; }
.form { display: grid; gap: 14px; }
.form label { font-weight: 800; color: var(--blue-deep); }
.form input, .form textarea, .form select { width: 100%; border: 1px solid var(--line); border-radius: 18px; padding: 12px 14px; background: #fff; color: var(--ink); }
.form textarea { min-height: 120px; resize: vertical; }
.faq { display: grid; gap: 12px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: 22px; overflow: hidden; }
.faq-question { width: 100%; background: transparent; border: 0; text-align: left; padding: 18px 20px; cursor: pointer; font-weight: 900; color: var(--ink); }
.faq-answer { display: none; padding: 0 20px 20px; color: var(--muted); }
.faq-item.open .faq-answer { display: block; }
.site-footer { margin-top: 50px; padding: 44px 0; background: #eaf7ff; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 28px; }
.site-footer h3 { margin: 0 0 10px; }
.site-footer p { margin: 0 0 10px; color: #5b7180; }
.update-time { font-weight: 800; color: var(--blue-deep) !important; }
@media (max-width: 920px) {
    .hero-grid, .split, .grid.two { grid-template-columns: 1fr; }
    .grid.three { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .section-head { display: block; }
    .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 680px) {
    .nav-toggle { display: inline-flex; }
    .site-nav { position: absolute; left: 16px; right: 16px; top: 72px; display: none; flex-direction: column; align-items: stretch; background: #fff; border: 1px solid var(--line); border-radius: 24px; padding: 12px; box-shadow: var(--shadow); }
    .site-nav.is-open { display: flex; }
    .site-nav a { display: block; }
    .hero { padding-top: 44px; }
    .hero-stats, .grid.three { grid-template-columns: 1fr; }
    .float-note { position: static; margin-top: 14px; max-width: none; }
    .section { padding: 48px 0; }
    .card { padding: 20px; }
}