:root {
    --ink: #1f2b28;
    --deep: #12342b;
    --green: #1f5b46;
    --green-soft: #dfeee4;
    --paper: #f7f1e6;
    --paper-2: #fffaf0;
    --sand: #dac9ad;
    --grey: #64706b;
    --line: rgba(31, 43, 40, .12);
    --shadow: 0 24px 70px rgba(18, 52, 43, .12);
    --radius-lg: 34px;
    --radius-md: 22px;
    --radius-sm: 14px;
}

* { 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: var(--paper);
    line-height: 1.72;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 18px clamp(18px, 4vw, 56px);
    background: rgba(247, 241, 230, .88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
}
.brand, .footer-brand { display: inline-flex; align-items: center; gap: 12px; }
.brand-mark {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: var(--deep);
    color: var(--paper-2);
    font-weight: 800;
    letter-spacing: .04em;
}
.brand-text { display: grid; line-height: 1.15; }
.brand-text strong { font-size: 1.1rem; letter-spacing: .08em; }
.brand-text small { color: var(--grey); font-size: .76rem; }
.site-nav { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.site-nav a {
    padding: 10px 13px;
    border-radius: 999px;
    color: #34443f;
    font-size: .95rem;
}
.site-nav a:hover, .site-nav a.is-active { background: var(--deep); color: var(--paper-2); }
.nav-toggle { display: none; background: none; border: 0; padding: 8px; }
.nav-toggle span { display: block; width: 24px; height: 2px; margin: 5px 0; background: var(--deep); }

.hero, .page-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr);
    gap: clamp(28px, 5vw, 72px);
    align-items: center;
    padding: clamp(56px, 8vw, 110px) clamp(20px, 5vw, 72px);
    overflow: hidden;
}
.hero-home {
    min-height: 720px;
    background:
        radial-gradient(circle at 15% 15%, rgba(223, 238, 228, .9), transparent 32%),
        linear-gradient(135deg, #f8f1e5 0%, #ecdfc8 52%, #dce9de 100%);
}
.page-hero.compact {
    min-height: 460px;
    background:
        radial-gradient(circle at 80% 18%, rgba(31,91,70,.14), transparent 28%),
        linear-gradient(135deg, #f9f3e9, #e8efe5);
    border-bottom: 1px solid var(--line);
}
.hero h1, .page-hero h1 {
    font-size: clamp(2.4rem, 5vw, 5.4rem);
    line-height: 1.08;
    margin: 10px 0 22px;
    letter-spacing: -.06em;
}
.page-hero h1 { font-size: clamp(2.05rem, 4vw, 4.2rem); }
.hero-lead, .page-hero p { font-size: clamp(1rem, 1.5vw, 1.22rem); color: #44534e; max-width: 760px; }
.eyebrow {
    margin: 0 0 10px;
    color: var(--green);
    font-size: .82rem;
    font-weight: 750;
    letter-spacing: .18em;
    text-transform: uppercase;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 34px; }
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 22px;
    border-radius: 999px;
    border: 1px solid var(--deep);
    cursor: pointer;
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(18,52,43,.16); }
.btn.primary { background: var(--deep); color: var(--paper-2); }
.btn.ghost { background: rgba(255,255,255,.34); }
.domain-card {
    margin-top: 32px;
    display: inline-grid;
    gap: 4px;
    padding: 16px 20px;
    border-radius: 20px;
    background: rgba(255,250,240,.74);
    border: 1px solid rgba(31,91,70,.16);
    box-shadow: var(--shadow);
}
.domain-card.inline { margin-top: 20px; }
.domain-card span { color: var(--grey); font-size: .9rem; }
.domain-card strong { color: var(--deep); word-break: break-all; }
.hero-visual, .page-hero-img, .split-media, .video-card, .category-card, .info-card, .topic-card, .course-card, .quote-card, .audience-card, .path-card {
    filter: drop-shadow(0 24px 56px rgba(18,52,43,.12));
}

.section { padding: clamp(58px, 8vw, 104px) clamp(20px, 5vw, 72px); }
.section.muted { background: rgba(255,250,240,.54); }
.section-heading { max-width: 790px; margin: 0 auto 42px; text-align: center; }
.section-heading h2, .split-text h2, .feature-text h2, .contact-info h2 {
    margin: 0 0 14px;
    font-size: clamp(1.8rem, 3.6vw, 3.1rem);
    line-height: 1.18;
    letter-spacing: -.04em;
}
.section-heading p, .split-text p, .feature-text p, .contact-info p { color: var(--grey); }
.category-grid, .info-grid, .audience-grid, .path-grid, .topic-grid, .video-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
}
.category-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.category-card, .info-card, .audience-card, .path-card, .topic-card, .video-card, .quote-card, .course-card, .message-form, .contact-info {
    background: rgba(255,250,240,.86);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 24px;
}
.category-card h3, .info-card h3, .audience-card h3, .path-card h3, .topic-card h3, .video-card h2, .video-card h3, .course-card h3 { margin: 10px 0 8px; line-height: 1.25; }
.category-card p, .info-card p, .audience-card p, .path-card p, .topic-card p, .video-card p, .course-card p { color: var(--grey); margin-bottom: 0; }
.split-section {
    display: grid;
    grid-template-columns: minmax(0, .9fr) minmax(320px, 1.1fr);
    gap: clamp(30px, 5vw, 70px);
    align-items: center;
}
.check-list { list-style: none; padding: 0; margin: 22px 0 0; display: grid; gap: 12px; }
.check-list li { position: relative; padding-left: 30px; color: #33433e; }
.check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: .55em;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--green);
    box-shadow: inset 0 0 0 4px var(--green-soft);
}
.video-card { padding: 0; overflow: hidden; }
.video-card img { width: 100%; }
.video-body { padding: 22px; }
.tag { display: inline-flex; align-items: center; gap: 8px; color: var(--green); background: var(--green-soft); padding: 6px 10px; border-radius: 999px; font-size: .84rem; }
.feature-band {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(280px, .75fr);
    gap: 28px;
    align-items: center;
    background: var(--deep);
    color: var(--paper-2);
}
.feature-band .eyebrow, .feature-band p { color: #c6dacd; }
.feature-list { display: grid; gap: 12px; }
.feature-list a {
    background: rgba(255,255,255,.1);
    border: 1px solid rgba(255,255,255,.16);
    border-radius: 18px;
    padding: 16px 18px;
}
.path-card span, .course-step {
    display: inline-grid;
    place-items: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--deep);
    color: var(--paper-2);
    font-weight: 800;
}
.faq-list { max-width: 900px; margin: 0 auto; display: grid; gap: 12px; }
details {
    background: rgba(255,250,240,.86);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 18px 22px;
}
summary { cursor: pointer; font-weight: 750; }
details p { color: var(--grey); margin-bottom: 0; }
.contact-cta { text-align: center; background: linear-gradient(135deg, #e8efe5, #f8f0e3); }
.contact-cta div { max-width: 820px; margin: 0 auto; }
.filter-toolbar { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin-bottom: 34px; }
.filter-btn {
    border: 1px solid var(--line);
    background: rgba(255,250,240,.78);
    color: var(--ink);
    border-radius: 999px;
    padding: 10px 18px;
    cursor: pointer;
}
.filter-btn.is-active { background: var(--deep); color: var(--paper-2); }
.filter-grid .is-hidden { display: none; }
.timeline { position: relative; display: grid; gap: 18px; max-width: 980px; margin: 0 auto; }
.timeline-item { padding: 24px 24px 24px 92px; border-radius: 24px; border: 1px solid var(--line); background: rgba(255,250,240,.82); position: relative; }
.timeline-item span { position: absolute; left: 24px; top: 24px; width: 48px; height: 48px; display: grid; place-items: center; border-radius: 50%; background: var(--green-soft); color: var(--green); font-weight: 800; }
.course-list { display: grid; gap: 16px; max-width: 980px; margin: 0 auto; }
.course-card { display: flex; gap: 18px; align-items: flex-start; }
.course-card small { color: var(--green); font-weight: 750; }
.contact-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 24px; align-items: start; }
.message-form { display: grid; gap: 16px; }
.message-form label { display: grid; gap: 8px; font-weight: 700; }
.message-form input, .message-form textarea {
    width: 100%; border: 1px solid var(--line); border-radius: 16px; padding: 13px 15px; background: #fffdf8; color: var(--ink);
}
.form-note { margin: 0; color: var(--grey); font-size: .92rem; }
.quote-card { font-size: clamp(1.2rem, 2vw, 1.8rem); color: var(--deep); }

.site-footer { padding: 58px clamp(20px, 5vw, 72px) 26px; background: #102b25; color: #e8efe5; }
.footer-grid { display: grid; grid-template-columns: 1.3fr .8fr 1fr .8fr; gap: 28px; }
.footer-grid h2 { font-size: 1rem; margin: 0 0 12px; }
.footer-grid p { color: #bdcec6; margin-top: 8px; }
.footer-grid a { display: block; color: #d8e7df; margin: 6px 0; }
.footer-brand { font-size: 1.2rem; font-weight: 850; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 34px; padding-top: 18px; display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; color: #bdcec6; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }
.delay-1 { transition-delay: .08s; }
.delay-2 { transition-delay: .14s; }
.delay-3 { transition-delay: .2s; }

@media (max-width: 1020px) {
    .hero, .page-hero, .split-section, .feature-band, .contact-layout { grid-template-columns: 1fr; }
    .category-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .video-grid, .topic-grid, .info-grid, .audience-grid, .path-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
    .site-header { align-items: flex-start; }
    .nav-toggle { display: block; }
    .site-nav {
        display: none;
        position: absolute;
        left: 18px;
        right: 18px;
        top: 76px;
        padding: 14px;
        background: rgba(247,241,230,.96);
        border: 1px solid var(--line);
        border-radius: 20px;
        box-shadow: var(--shadow);
    }
    .site-nav.is-open { display: grid; }
    .site-nav a { padding: 12px 14px; }
    .hero, .page-hero { padding-top: 48px; }
    .category-grid, .video-grid, .topic-grid, .info-grid, .audience-grid, .path-grid, .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { display: grid; }
    .timeline-item { padding-left: 24px; padding-top: 86px; }
}