:root {
    color-scheme: light;
    --bg: #0f172a;
    --card: #111827;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --accent: #38bdf8;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: radial-gradient(circle at top, #1e293b 0, var(--bg) 48%);
    color: var(--text);
}

.shell {
    width: min(880px, 92vw);
    margin: 8vh auto 0;
    background: rgba(17, 24, 39, 0.9);
    border: 1px solid rgba(148, 163, 184, 0.35);
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 24px 80px rgba(2, 6, 23, 0.45);
}

h1 {
    margin: 0 0 8px;
    font-size: clamp(1.5rem, 3vw, 2.25rem);
}

.subtitle {
    margin: 0 0 20px;
    color: var(--muted);
}

.tag {
    display: inline-block;
    margin-bottom: 16px;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    color: #0f172a;
    background: var(--accent);
    font-weight: 600;
}

.panel {
    border: 1px solid rgba(148, 163, 184, 0.28);
    border-radius: 12px;
    padding: 18px 16px;
    margin-top: 16px;
    background: rgba(15, 23, 42, 0.45);
}

.panel p {
    margin: 0;
    line-height: 1.7;
    color: var(--text);
}

.links {
    margin-top: 22px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.links a {
    text-decoration: none;
    color: #0f172a;
    background: #e2e8f0;
    border-radius: 10px;
    padding: 10px 14px;
    font-weight: 600;
}

.footnote {
    margin-top: 18px;
    color: var(--muted);
    font-size: 0.92rem;
}