:root {
    --blue: #75b8df;
    --blue-deep: #337fa9;
    --cream: #fff5cf;
    --orange: #f5a65a;
    --orange-soft: #ffe3bd;
    --white: #ffffff;
    --ink: #244056;
    --muted: #647887;
    --line: #dbeaf1;
    --card: #ffffffcc;
    --shadow: 0 18px 50px rgba(37, 83, 115, .13);
    --radius-lg: 30px;
    --radius-md: 22px;
    --radius-sm: 16px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--ink);
    background: linear-gradient(180deg, #eff9ff 0%, #fffdf3 42%, #ffffff 100%);
    line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.88); backdrop-filter: blur(18px); border-bottom: 1px solid rgba(117,184,223,.22); }
.notice-bar { display: flex; justify-content: center; gap: 10px; padding: 8px 18px; background: var(--cream); color: #6b5823; font-size: 14px; }
.notice-bar span { background: var(--orange-soft); border-radius: 999px; padding: 1px 10px; }
.nav-wrap { max-width: 1180px; margin: 0 auto; padding: 16px 22px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 22px; }
.brand-mark { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 15px; background: linear-gradient(135deg, var(--blue), var(--orange-soft)); color: #fff; box-shadow: var(--shadow); }
.nav-list { list-style: none; display: flex; gap: 8px; margin: 0; padding: 0; align-items: center; }
.nav-list a { display: block; padding: 10px 13px; border-radius: 999px; color: var(--muted); font-weight: 650; }
.nav-list a:hover, .nav-list a[aria-current="page"] { background: #e9f6fc; color: var(--blue-deep); }
.nav-toggle { display: none; border: 0; background: #e9f6fc; color: var(--blue-deep); border-radius: 14px; width: 44px; height: 44px; font-size: 20px; }
main { overflow: hidden; }
.section-soft, .section-pad, .page-hero { max-width: 1180px; margin: 0 auto; padding: 72px 22px; }
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(320px, 520px); gap: 52px; align-items: center; min-height: 640px; }
.eyebrow { margin: 0 0 10px; color: var(--blue-deep); font-weight: 800; letter-spacing: .08em; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 16px; }
h1 { font-size: clamp(38px, 6vw, 68px); letter-spacing: -0.04em; }
h2 { font-size: clamp(28px, 3.2vw, 42px); letter-spacing: -0.03em; }
h3 { font-size: 21px; }
p { margin: 0 0 16px; }
.hero-lead, .page-hero p, .section-title p { font-size: 18px; color: var(--muted); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 28px 0; }
.btn { border: 0; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 12px 22px; border-radius: 999px; font-weight: 800; transition: transform .2s ease, box-shadow .2s ease; }
.btn:hover { transform: translateY(-2px); }
.btn.primary { background: linear-gradient(135deg, var(--orange), #ffcf7a); color: #fff; box-shadow: 0 12px 28px rgba(245,166,90,.3); }
.btn.ghost { background: #ffffff; color: var(--blue-deep); border: 1px solid var(--line); }
.hero-pills, .mini-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-pills span, .mini-tags span, .age-card span { padding: 8px 13px; border-radius: 999px; background: #fff; border: 1px solid var(--line); color: var(--blue-deep); font-weight: 700; }
.card-art, .media-card, .principle-card, .contact-card, .feedback-form { background: rgba(255,255,255,.78); border: 1px solid rgba(117,184,223,.22); border-radius: var(--radius-lg); box-shadow: var(--shadow); padding: 24px; }
.section-title { max-width: 820px; margin: 0 auto 34px; text-align: center; }
.section-title.narrow { max-width: 720px; }
.age-grid, .content-grid, .feedback-grid, .quote-grid, .video-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.age-card, .content-card, .topic-board article, .steps article, .timeline article, .quote-grid article, .video-card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-md); padding: 24px; box-shadow: 0 14px 36px rgba(37,83,115,.08); }
.age-card img, .content-card img { margin-bottom: 18px; border-radius: 18px; background: #f5fbff; }
.split-panel { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px; align-items: center; }
.split-panel.reverse { grid-template-columns: minmax(320px, .9fr) minmax(0, 1.1fr); }
.check-list { padding: 0; list-style: none; margin: 22px 0 0; }
.check-list li { position: relative; padding-left: 34px; margin: 12px 0; color: var(--muted); }
.check-list li:before { content: "✓"; position: absolute; left: 0; top: 0; width: 24px; height: 24px; display: grid; place-items: center; border-radius: 50%; background: #e6f7ef; color: #329765; font-weight: 900; line-height: 1; }
.warm-bg { max-width: none; background: linear-gradient(135deg, rgba(255,245,207,.78), rgba(232,247,255,.86)); border-block: 1px solid rgba(117,184,223,.14); }
.warm-bg > * { max-width: 1180px; margin-left: auto; margin-right: auto; }
.three { grid-template-columns: repeat(3, minmax(0,1fr)); }
.guide-section .steps, .steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.steps.wide { grid-template-columns: repeat(3, minmax(0,1fr)); }
.steps span, .timeline span, .age-badge { display: inline-flex; min-width: 48px; min-height: 48px; align-items: center; justify-content: center; border-radius: 18px; background: #e9f6fc; color: var(--blue-deep); font-weight: 900; margin-bottom: 14px; }
.topic-board { display: grid; grid-template-columns: 1.2fr .9fr .9fr; gap: 18px; }
.movie-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 22px; }
.movie-card { display: grid; grid-template-rows: auto 1fr; overflow: hidden; border-radius: var(--radius-md); background: #fff; border: 1px solid var(--line); box-shadow: 0 14px 36px rgba(37,83,115,.08); }
.movie-card div { padding: 20px; }
.movie-card span { color: var(--blue-deep); font-weight: 800; font-size: 14px; }
.feedback-section { max-width: none; background: #f4fbff; }
.feedback-grid { max-width: 1180px; margin: 0 auto; }
blockquote { margin: 0; background: #fff; border-radius: var(--radius-md); padding: 24px; border: 1px solid var(--line); box-shadow: 0 14px 36px rgba(37,83,115,.08); color: var(--ink); }
blockquote cite { display: block; margin-top: 16px; color: var(--blue-deep); font-style: normal; font-weight: 800; }
.faq-list { max-width: 880px; margin: 0 auto; display: grid; gap: 12px; }
details { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 18px 20px; }
summary { cursor: pointer; font-weight: 850; color: var(--ink); }
details p { margin-top: 12px; color: var(--muted); }
.contact-strip { display: flex; justify-content: space-between; align-items: center; gap: 24px; background: linear-gradient(135deg, var(--blue), #9bd6ec); border-radius: var(--radius-lg); color: #fff; margin-bottom: 70px; box-shadow: var(--shadow); }
.contact-strip .eyebrow, .contact-strip p { color: #fff; }
.page-hero { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr); gap: 42px; align-items: center; padding-top: 76px; }
.page-hero img { border-radius: var(--radius-lg); background: #fff; box-shadow: var(--shadow); }
.principle-card ol { margin: 0; padding-left: 20px; color: var(--muted); }
.timeline { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 20px; }
.filter-tabs { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin-bottom: 26px; }
.filter-tabs button { border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 10px 18px; color: var(--blue-deep); font-weight: 800; cursor: pointer; }
.filter-tabs button.is-active { background: var(--blue); color: #fff; }
.age-detail { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 22px; }
.age-detail article { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-md); padding: 28px; box-shadow: var(--shadow); }
.video-grid { grid-template-columns: repeat(4, minmax(0,1fr)); }
.video-thumb { position: relative; border-radius: 20px; overflow: hidden; background: #f6fbff; margin-bottom: 18px; }
.video-thumb span { position: absolute; inset: 0; margin: auto; width: 58px; height: 58px; border-radius: 50%; display: grid; place-items: center; background: rgba(255,255,255,.86); color: var(--orange); font-weight: 900; box-shadow: var(--shadow); }
.contact-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 26px; align-items: start; }
.feedback-form { display: grid; gap: 14px; }
.feedback-form label { display: grid; gap: 7px; font-weight: 800; color: var(--ink); }
.feedback-form input, .feedback-form select, .feedback-form textarea { width: 100%; border: 1px solid var(--line); border-radius: 16px; padding: 13px 15px; font: inherit; color: var(--ink); background: #fff; }
.form-note { color: var(--muted); font-size: 14px; }
.site-footer { background: #244056; color: #eaf7fc; padding: 54px 22px; }
.footer-grid { max-width: 1180px; margin: 0 auto; display: grid; grid-template-columns: 1.4fr .7fr .9fr; gap: 32px; }
.site-footer h2, .site-footer h3 { color: #fff; }
.site-footer a { display: block; color: #d9f2fb; margin: 8px 0; }
.domain-line { color: #c8e4ee; }
@media (max-width: 960px) {
    .hero, .page-hero, .split-panel, .split-panel.reverse, .contact-grid { grid-template-columns: 1fr; }
    .age-grid, .content-grid, .movie-grid, .feedback-grid, .timeline, .age-detail, .quote-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
    .guide-section .steps, .steps, .steps.wide, .video-grid, .topic-board { grid-template-columns: repeat(2, minmax(0,1fr)); }
    .contact-strip { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 720px) {
    .notice-bar { display: none; }
    .nav-toggle { display: inline-grid; place-items: center; }
    .nav-list { position: absolute; left: 16px; right: 16px; top: 76px; display: none; flex-direction: column; align-items: stretch; background: #fff; border: 1px solid var(--line); border-radius: 22px; padding: 12px; box-shadow: var(--shadow); }
    .nav-list.is-open { display: flex; }
    .nav-list a { padding: 12px 14px; }
    .section-soft, .section-pad, .page-hero { padding: 48px 18px; }
    .hero { min-height: auto; }
    .age-grid, .content-grid, .movie-grid, .feedback-grid, .timeline, .age-detail, .quote-grid, .guide-section .steps, .steps, .steps.wide, .video-grid, .topic-board, .footer-grid { grid-template-columns: 1fr; }
    h1 { font-size: 38px; }
    .footer-grid { gap: 18px; }
}