:root {
    --ink: #0f172a;
    --muted: #64748b;
    --line: #e2e8f0;
    --blue: #1d4ed8;
    --blue-dark: #172554;
    --soft: #eff6ff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--ink);
    background: #f8fafc;
    font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
    line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.site-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.96);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(14px);
}
.nav-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 800; color: var(--blue-dark); }
.brand img { width: 44px; height: 44px; }
.brand small { display: block; color: var(--muted); font-size: 11px; font-weight: 500; letter-spacing: .08em; }
.nav-links { display: flex; align-items: center; gap: 28px; font-size: 14px; font-weight: 600; }
.nav-links a:hover { color: var(--blue); }
.nav-cta, .button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: 14px;
    padding: 13px 22px;
    color: white;
    background: var(--blue);
    font: inherit;
    font-weight: 700;
    cursor: pointer;
}
.button.secondary { color: var(--blue-dark); background: white; }
.hero {
    padding: 96px 0 84px;
    color: white;
    background:
        radial-gradient(circle at 80% 20%, rgba(59,130,246,.55), transparent 28%),
        linear-gradient(135deg, #0f172a, #1e3a8a);
}
.eyebrow { margin-bottom: 18px; color: #bfdbfe; font-size: 14px; font-weight: 700; letter-spacing: .12em; }
.hero h1 { max-width: 900px; margin: 0; font-size: clamp(40px, 6vw, 68px); line-height: 1.15; }
.hero p { max-width: 780px; margin: 24px 0 0; color: #dbeafe; font-size: 19px; }
.notice {
    margin-top: 34px;
    padding: 16px 20px;
    border: 1px solid rgba(255,255,255,.22);
    border-radius: 16px;
    color: #e0f2fe;
    background: rgba(255,255,255,.08);
    font-size: 14px;
}
.section { padding: 78px 0; }
.section.white { background: white; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 34px; }
.section h2 { margin: 0; font-size: clamp(30px, 4vw, 44px); line-height: 1.25; }
.section-head p { max-width: 620px; margin: 0; color: var(--muted); }
.case-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 24px; }
.case-card {
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: white;
    box-shadow: 0 16px 40px rgba(15,23,42,.06);
    transition: transform .25s, box-shadow .25s;
}
.case-card:hover { transform: translateY(-5px); box-shadow: 0 22px 50px rgba(30,64,175,.14); }
.case-card img { width: 100%; aspect-ratio: 16/9; object-fit: cover; border-bottom: 1px solid var(--line); }
.case-body { padding: 24px; }
.tag { display: inline-block; margin-bottom: 12px; color: var(--blue); font-size: 13px; font-weight: 800; }
.case-card h3 { margin: 0 0 10px; font-size: 22px; line-height: 1.35; }
.case-card p { margin: 0; color: var(--muted); font-size: 15px; }
.case-link { display: inline-block; margin-top: 18px; color: var(--blue); font-weight: 800; }
.scenario-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 20px; }
.scenario {
    padding: 28px;
    border: 1px solid #bfdbfe;
    border-radius: 22px;
    background: var(--soft);
}
.scenario h3 { margin: 0 0 10px; font-size: 21px; }
.scenario p { margin: 0; color: #475569; }
.breadcrumb { padding: 14px 0; color: var(--muted); font-size: 14px; background: white; border-bottom: 1px solid var(--line); }
.case-hero { padding: 70px 0; color: white; background: linear-gradient(135deg, #0f172a, #1e3a8a); }
.case-hero h1 { max-width: 850px; margin: 12px 0 16px; font-size: clamp(38px, 5vw, 58px); line-height: 1.18; }
.case-hero p { max-width: 760px; margin: 0; color: #dbeafe; font-size: 18px; }
.case-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.case-meta span { padding: 7px 12px; border: 1px solid rgba(255,255,255,.24); border-radius: 999px; background: rgba(255,255,255,.08); font-size: 13px; }
.detail-layout { display: grid; grid-template-columns: minmax(0,1.4fr) minmax(280px,.6fr); gap: 40px; align-items: start; }
.evidence-image { overflow: hidden; margin-bottom: 34px; border: 1px solid var(--line); border-radius: 24px; background: white; box-shadow: 0 18px 45px rgba(15,23,42,.08); }
.evidence-image img { width: 100%; }
.content-block { margin-bottom: 38px; }
.content-block h2 { margin: 0 0 14px; font-size: 30px; }
.content-block p { margin: 0 0 14px; color: #475569; }
.content-block ul { margin: 0; padding-left: 22px; color: #475569; }
.side-card { position: sticky; top: 102px; padding: 28px; border-radius: 22px; color: white; background: var(--blue-dark); }
.side-card h2 { margin: 0 0 12px; font-size: 25px; }
.side-card p { color: #dbeafe; }
.source-note { padding: 18px 20px; border-left: 4px solid #60a5fa; color: #475569; background: #eff6ff; font-size: 14px; }
.footer { padding: 44px 0; color: #94a3b8; background: #020617; font-size: 14px; }
.footer-inner { display: flex; justify-content: space-between; gap: 30px; }
.footer strong { color: white; }
.footer a:hover { color: white; }

@media (max-width: 900px) {
    .nav-links { display: none; }
    .case-grid, .scenario-grid { grid-template-columns: 1fr 1fr; }
    .detail-layout { grid-template-columns: 1fr; }
    .side-card { position: static; }
}
@media (max-width: 620px) {
    .container { width: min(100% - 28px, 1180px); }
    .nav-cta { padding: 11px 14px; font-size: 13px; }
    .hero { padding: 70px 0 62px; }
    .section { padding: 58px 0; }
    .section-head { display: block; }
    .section-head p { margin-top: 14px; }
    .case-grid, .scenario-grid { grid-template-columns: 1fr; }
    .footer-inner { display: block; }
}