:root {
    --ink: #1f2a27;
    --muted: #64706b;
    --deep: #153d34;
    --deep-2: #0f2b25;
    --leaf: #2f6f5e;
    --moss: #71917f;
    --sand: #f4efe3;
    --paper: #fffdf7;
    --line: rgba(31, 42, 39, .12);
    --shadow: 0 22px 55px rgba(21, 61, 52, .14);
    --radius-xl: 30px;
    --radius-lg: 22px;
    --radius-md: 16px;
    --max: 1180px;
}

* { 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", sans-serif;
    color: var(--ink);
    background: var(--paper);
    line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea, select { font: inherit; }
.container { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.skip-link { position: absolute; left: -999px; top: 8px; background: var(--deep); color: #fff; padding: 10px 14px; border-radius: 999px; z-index: 10; }
.skip-link:focus { left: 12px; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 9;
    background: rgba(255, 253, 247, .92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
}
.header-inner { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 800; letter-spacing: .08em; }
.brand-mark {
    width: 42px; height: 42px; border-radius: 16px;
    display: grid; place-items: center;
    color: #fff; background: linear-gradient(135deg, var(--deep), var(--leaf));
    box-shadow: 0 12px 22px rgba(21, 61, 52, .22);
}
.brand-name { font-size: 20px; }
.site-nav { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.site-nav a { padding: 9px 13px; border-radius: 999px; color: #3a4843; font-size: 15px; }
.site-nav a:hover, .site-nav a.active { background: #e7efe7; color: var(--deep); }
.nav-toggle { display: none; border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 8px 14px; color: var(--deep); }

.hero { position: relative; overflow: hidden; padding: 76px 0 54px; background: radial-gradient(circle at 18% 18%, #e9efe4 0 0, transparent 34%), linear-gradient(180deg, #fbf8ef 0%, #f4efe3 100%); }
.hero::after { content: ""; position: absolute; inset: auto -10% -35% 48%; height: 440px; border-radius: 50%; background: rgba(47, 111, 94, .10); filter: blur(2px); }
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.02fr .98fr; gap: 44px; align-items: center; }
.kicker { display: inline-flex; align-items: center; gap: 10px; color: var(--deep); font-weight: 700; letter-spacing: .08em; font-size: 14px; }
.kicker::before { content: ""; width: 34px; height: 1px; background: var(--leaf); }
h1, h2, h3 { line-height: 1.22; margin: 0; color: var(--deep-2); }
h1 { font-size: clamp(38px, 6vw, 68px); letter-spacing: -.05em; margin-top: 18px; }
.hero p { font-size: 18px; color: #4f5d58; margin: 24px 0 0; max-width: 720px; }
.hero-actions { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 46px; padding: 0 20px; border-radius: 999px; font-weight: 700; border: 1px solid var(--line); }
.btn.primary { background: var(--deep); color: #fff; box-shadow: 0 18px 34px rgba(21, 61, 52, .23); }
.btn.secondary { background: rgba(255,255,255,.72); color: var(--deep); }
.hero-card { background: rgba(255, 253, 247, .75); border: 1px solid rgba(255,255,255,.75); border-radius: var(--radius-xl); padding: 18px; box-shadow: var(--shadow); }
.hero-card img { border-radius: 24px; background: #e8efe8; }
.hero-card-note { padding: 18px 4px 4px; display: grid; gap: 6px; }
.hero-card-note strong { color: var(--deep); font-size: 19px; }
.hero-card-note span { color: var(--muted); }

.section { padding: 72px 0; }
.section.alt { background: #f6f1e8; }
.section-head { display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: end; margin-bottom: 30px; }
.section-head h2 { font-size: clamp(28px, 4vw, 44px); letter-spacing: -.04em; }
.section-head p { margin: 12px 0 0; color: var(--muted); max-width: 760px; }
.section-link { color: var(--deep); font-weight: 800; border-bottom: 1px solid var(--deep); padding-bottom: 4px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.card, .wide-card, .info-panel, .quote-panel, .form-panel { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-lg); box-shadow: 0 14px 36px rgba(21,61,52,.08); overflow: hidden; }
.card.pad, .info-panel, .quote-panel, .form-panel { padding: 24px; }
.card img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; background: #e7ede4; }
.card-body { padding: 22px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.tag { display: inline-flex; align-items: center; border: 1px solid #cddbd0; border-radius: 999px; padding: 4px 10px; font-size: 13px; color: var(--deep); background: #edf3eb; }
.card h3 { font-size: 22px; margin-bottom: 10px; }
.card p, .wide-card p, .info-panel p, .quote-panel p, .form-panel p { color: var(--muted); margin: 0; }
.note-list { display: grid; gap: 10px; margin: 18px 0 0; padding: 0; list-style: none; color: #43524c; }
.note-list li { display: flex; gap: 10px; }
.note-list li::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--leaf); margin-top: .68em; flex: 0 0 auto; }
.wide-card { display: grid; grid-template-columns: .9fr 1.1fr; align-items: center; }
.wide-card img { height: 100%; min-height: 280px; object-fit: cover; background: #e6ede6; }
.wide-card-content { padding: 30px; }
.timeline { position: relative; display: grid; gap: 16px; }
.step { display: grid; grid-template-columns: 58px 1fr; gap: 16px; align-items: start; padding: 18px; border: 1px solid var(--line); border-radius: 20px; background: rgba(255,253,247,.72); }
.step-number { width: 48px; height: 48px; border-radius: 18px; display: grid; place-items: center; background: var(--deep); color: #fff; font-weight: 800; }
.step h3 { font-size: 20px; margin-bottom: 6px; }
.step p { color: var(--muted); margin: 0; }
.feature-band { border-radius: var(--radius-xl); background: linear-gradient(135deg, var(--deep), #275f51); color: #fff; padding: 34px; display: grid; grid-template-columns: 1fr 1fr; gap: 22px; align-items: center; box-shadow: var(--shadow); }
.feature-band h2, .feature-band h3 { color: #fff; }
.feature-band p { color: rgba(255,255,255,.82); }
.feature-points { display: grid; gap: 12px; }
.feature-points div { padding: 16px; border-radius: 18px; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.15); }

.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 24px; }
.filter-btn { border: 1px solid var(--line); background: #fff; color: var(--deep); border-radius: 999px; padding: 9px 14px; cursor: pointer; }
.filter-btn.active, .filter-btn:hover { background: var(--deep); color: #fff; }
.video-shell { aspect-ratio: 16/9; display: grid; place-items: center; background: radial-gradient(circle at 30% 30%, #486f61, #153d34 62%); color: #fff; position: relative; overflow: hidden; }
.video-shell::before { content: ""; width: 74px; height: 74px; border-radius: 50%; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.35); position: absolute; }
.video-shell::after { content: ""; width: 0; height: 0; border-top: 14px solid transparent; border-bottom: 14px solid transparent; border-left: 22px solid #fff; position: absolute; transform: translateX(4px); }
.video-shell span { position: absolute; left: 18px; bottom: 16px; font-weight: 700; background: rgba(0,0,0,.25); border-radius: 999px; padding: 4px 10px; }
.page-hero { padding: 64px 0 42px; background: linear-gradient(180deg, #fbf8ef, #f4efe3); border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: clamp(34px, 5vw, 58px); max-width: 900px; }
.page-hero p { color: var(--muted); max-width: 780px; margin: 18px 0 0; font-size: 18px; }
.breadcrumb { display: flex; gap: 8px; flex-wrap: wrap; color: var(--muted); margin-bottom: 18px; font-size: 14px; }
.breadcrumb a { color: var(--deep); font-weight: 700; }
.topic-map { display: grid; grid-template-columns: 1.1fr .9fr; gap: 24px; align-items: stretch; }
.topic-map img { height: 100%; object-fit: cover; border-radius: var(--radius-lg); background: #e7ede4; border: 1px solid var(--line); }
.plan-table { width: 100%; border-collapse: collapse; overflow: hidden; border-radius: var(--radius-lg); background: var(--paper); box-shadow: 0 14px 36px rgba(21,61,52,.08); }
.plan-table th, .plan-table td { padding: 16px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
.plan-table th { color: var(--deep); background: #edf3eb; }
.plan-table tr:last-child td { border-bottom: 0; }
.form-grid { display: grid; gap: 14px; }
.field { display: grid; gap: 7px; color: var(--deep); font-weight: 700; }
.field input, .field textarea, .field select { border: 1px solid var(--line); border-radius: 16px; padding: 12px 14px; background: #fff; color: var(--ink); }
.field textarea { min-height: 130px; resize: vertical; }
.notice { padding: 14px 16px; border-radius: 16px; background: #e7efe7; color: var(--deep); margin-bottom: 16px; border: 1px solid #cddbd0; }
.faq { display: grid; gap: 14px; }
.faq details { background: var(--paper); border: 1px solid var(--line); border-radius: 18px; padding: 16px 18px; }
.faq summary { cursor: pointer; color: var(--deep); font-weight: 800; }
.faq p { color: var(--muted); margin: 10px 0 0; }

.site-footer { background: #122822; color: rgba(255,255,255,.78); padding: 54px 0 26px; }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr .8fr; gap: 28px; }
.footer-brand { color: #fff; font-size: 26px; font-weight: 900; letter-spacing: .08em; margin-bottom: 10px; }
.site-footer h2 { color: #fff; font-size: 18px; margin-bottom: 12px; }
.footer-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 7px; }
.update-time { color: #fff; font-weight: 800; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 32px; padding-top: 18px; font-size: 14px; }

@media (max-width: 920px) {
    .hero-grid, .grid-3, .grid-2, .wide-card, .feature-band, .topic-map, .footer-grid { grid-template-columns: 1fr; }
    .section-head { grid-template-columns: 1fr; }
    .hero { padding-top: 52px; }
    .site-nav { display: none; position: absolute; inset: 74px 20px auto; background: var(--paper); border: 1px solid var(--line); border-radius: 22px; padding: 12px; box-shadow: var(--shadow); }
    .site-nav.open { display: grid; }
    .site-nav a { padding: 12px 14px; }
    .nav-toggle { display: inline-flex; }
}
@media (max-width: 560px) {
    .container { width: min(100% - 28px, var(--max)); }
    .section { padding: 52px 0; }
    .hero-actions { flex-direction: column; align-items: stretch; }
    .step { grid-template-columns: 1fr; }
    .feature-band { padding: 24px; }
    .plan-table { display: block; overflow-x: auto; }
}