:root {
    --blue: #8fd3ff;
    --blue-strong: #45a9e8;
    --cream: #fff4c7;
    --orange: #ffb36b;
    --orange-strong: #f48a3d;
    --white: #ffffff;
    --ink: #26384f;
    --muted: #66758a;
    --line: rgba(69, 169, 232, .18);
    --shadow: 0 18px 45px rgba(69, 169, 232, .16);
    --radius-xl: 34px;
    --radius-lg: 24px;
    --radius-md: 16px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--ink);
    background:
        radial-gradient(circle at 9% 3%, rgba(255, 244, 199, .9), transparent 30%),
        radial-gradient(circle at 96% 7%, rgba(143, 211, 255, .48), transparent 28%),
        linear-gradient(180deg, #f8fcff 0%, #fffaf0 46%, #ffffff 100%);
    line-height: 1.76;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 22px;
    padding: 16px clamp(18px, 4vw, 56px);
    background: rgba(255, 255, 255, .86);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 800; }
.brand-mark {
    display: inline-grid;
    place-items: center;
    width: 48px;
    height: 48px;
    border-radius: 17px;
    background: linear-gradient(135deg, var(--blue), var(--cream) 52%, var(--orange));
    color: #24405b;
    box-shadow: 0 8px 20px rgba(244, 138, 61, .18);
}
.brand-text { letter-spacing: .05em; }
.site-nav { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.site-nav a {
    padding: 10px 13px;
    border-radius: 999px;
    font-size: 15px;
    color: #3f526a;
}
.site-nav a:hover, .site-nav a.active { background: #edf8ff; color: #1377b5; }
.nav-toggle { display: none; border: 0; background: #edf8ff; border-radius: 15px; padding: 10px 14px; font-size: 22px; color: var(--ink); }
main { overflow: hidden; }
.section, .hero { padding: clamp(42px, 7vw, 84px) clamp(18px, 5vw, 72px); }
.hero { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(300px, .95fr); gap: clamp(28px, 5vw, 70px); align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; padding: 8px 13px; border-radius: 999px; background: #fff8d9; color: #916424; font-weight: 700; font-size: 14px; }
.eyebrow::before { content: "★"; color: var(--orange-strong); }
h1, h2, h3 { line-height: 1.18; margin: 0 0 18px; }
h1 { font-size: clamp(38px, 7vw, 76px); letter-spacing: -0.04em; }
h2 { font-size: clamp(30px, 4vw, 50px); letter-spacing: -0.03em; }
h3 { font-size: clamp(20px, 2vw, 26px); }
p { margin: 0 0 16px; color: var(--muted); }
.lead { font-size: clamp(18px, 2.2vw, 22px); color: #52657d; max-width: 760px; }
.hero-actions, .actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 28px; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 12px 20px; border-radius: 999px; font-weight: 800; border: 1px solid transparent; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { color: #26384f; background: linear-gradient(135deg, var(--cream), var(--orange)); box-shadow: 0 14px 28px rgba(244, 138, 61, .2); }
.btn-secondary { background: #ffffff; border-color: var(--line); color: #2d6791; }
.hero-card, .soft-panel { background: rgba(255, 255, 255, .78); border: 1px solid var(--line); border-radius: var(--radius-xl); box-shadow: var(--shadow); padding: clamp(20px, 3vw, 34px); }
.hero-card img { border-radius: 28px; }
.hero-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 18px; }
.stat { padding: 16px; border-radius: 20px; background: #f4fbff; text-align: center; }
.stat strong { display: block; font-size: 22px; color: #1d7eb8; }
.section-head { max-width: 850px; margin: 0 auto 34px; text-align: center; }
.section-head.left { margin-left: 0; text-align: left; }
.grid { display: grid; gap: 20px; }
.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 { background: rgba(255, 255, 255, .86); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 24px; box-shadow: 0 12px 30px rgba(69, 169, 232, .09); }
.card.highlight { background: linear-gradient(135deg, rgba(255, 244, 199, .9), rgba(255,255,255,.95)); }
.card img { margin-bottom: 18px; border-radius: 22px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 9px; margin: 15px 0 0; }
.tag { display: inline-flex; align-items: center; border-radius: 999px; background: #edf8ff; color: #2478ad; padding: 6px 11px; font-size: 13px; font-weight: 700; }
.tag.warm { background: #fff4df; color: #b16420; }
.tag.safe { background: #effdf5; color: #307b50; }
.split { display: grid; grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr); gap: clamp(24px, 5vw, 56px); align-items: center; }
.feature-list { list-style: none; padding: 0; margin: 22px 0 0; display: grid; gap: 14px; }
.feature-list li { display: grid; grid-template-columns: 34px 1fr; gap: 12px; align-items: start; padding: 16px; border-radius: 18px; background: #ffffff; border: 1px solid var(--line); }
.feature-list span:first-child { width: 34px; height: 34px; border-radius: 12px; display: inline-grid; place-items: center; background: #fff4d5; color: #b16420; font-weight: 900; }
.timeline { display: grid; gap: 18px; counter-reset: step; }
.timeline .step { position: relative; padding: 22px 22px 22px 70px; border-radius: 24px; background: #fff; border: 1px solid var(--line); }
.timeline .step::before { counter-increment: step; content: counter(step); position: absolute; left: 22px; top: 22px; width: 34px; height: 34px; display: grid; place-items: center; border-radius: 12px; background: var(--blue); color: #fff; font-weight: 900; }
.video-card { overflow: hidden; padding: 0; }
.video-thumb { position: relative; background: #edf8ff; }
.play { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); width: 62px; height: 62px; border-radius: 50%; background: rgba(255,255,255,.92); display: grid; place-items: center; box-shadow: 0 10px 26px rgba(38,56,79,.18); }
.play::before { content: ""; margin-left: 5px; border-left: 18px solid #f48a3d; border-top: 12px solid transparent; border-bottom: 12px solid transparent; }
.video-card .card-body { padding: 22px; }
.notice { border-left: 5px solid var(--orange); padding: 18px 20px; background: #fff8e7; border-radius: 18px; color: #5d5b52; }
.faq { display: grid; gap: 14px; max-width: 920px; margin: 0 auto; }
details { background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 18px 20px; }
summary { cursor: pointer; font-weight: 800; color: var(--ink); }
details p { margin-top: 12px; }
.form { display: grid; gap: 14px; }
.form label { display: grid; gap: 8px; font-weight: 800; color: #334860; }
.form input, .form textarea, .form select { width: 100%; border: 1px solid var(--line); border-radius: 15px; padding: 13px 14px; font: inherit; color: var(--ink); background: #fff; }
.form textarea { min-height: 130px; resize: vertical; }
.form-message { min-height: 28px; color: #287a4f; font-weight: 700; }
.domain-box { display: grid; gap: 8px; padding: 18px; border-radius: 20px; background: #edf8ff; color: #315a76; }
.domain-pill { display: inline-flex; width: fit-content; max-width: 100%; overflow-wrap: anywhere; padding: 8px 12px; border-radius: 999px; background: #fff; color: #1e78b0; font-weight: 800; border: 1px solid var(--line); }
.site-footer { padding: 42px clamp(18px, 5vw, 72px) 26px; background: #26384f; color: #fff; }
.site-footer p, .site-footer a, .site-footer span { color: rgba(255,255,255,.76); }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr 1fr; gap: 30px; }
.footer-grid div { display: grid; align-content: start; gap: 8px; }
.footer-brand { font-size: 24px; font-weight: 900; color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.14); margin-top: 28px; padding-top: 18px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.mini-kicker { font-weight: 900; color: #1d7eb8; margin-bottom: 8px; }
.age-badge { display: inline-grid; place-items: center; min-width: 58px; height: 58px; padding: 0 10px; border-radius: 19px; background: linear-gradient(135deg, var(--blue), var(--cream)); font-weight: 900; color: #24405b; margin-bottom: 16px; }
.page-hero { padding: clamp(42px, 7vw, 76px) clamp(18px, 5vw, 72px); text-align: center; }
.page-hero .lead { margin-inline: auto; }
.anchor-list { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 26px; }
.anchor-list a { padding: 10px 14px; border-radius: 999px; background: #fff; border: 1px solid var(--line); color: #286f9d; font-weight: 700; }
@media (max-width: 980px) {
    .hero, .split { grid-template-columns: 1fr; }
    .grid-4, .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
    .site-header { align-items: flex-start; }
    .nav-toggle { display: inline-flex; }
    .site-nav { display: none; position: absolute; left: 16px; right: 16px; top: 76px; padding: 14px; background: #fff; border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow); }
    .site-nav.open { display: grid; }
    .site-nav a { width: 100%; }
    .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
    .hero-stats { grid-template-columns: 1fr; }
    h1 { font-size: 40px; }
    .section, .hero, .page-hero { padding-block: 38px; }
}
@media (prefers-reduced-motion: no-preference) {
    .card, .hero-card, .soft-panel { transition: transform .22s ease, box-shadow .22s ease; }
    .card:hover, .hero-card:hover, .soft-panel:hover { transform: translateY(-3px); box-shadow: 0 22px 54px rgba(69, 169, 232, .15); }
}