:root {
    --ink: #1a1d21;
    --body: #4a5568;
    --muted: #8895a7;
    --line: #e2e8f0;
    --panel: #f7fafc;
    --accent: #3182ce;
    --radius: 12px;
}

* { box-sizing: border-box; margin: 0; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.72;
    color: var(--body);
    background: #fff;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { width: min(740px, calc(100% - 40px)); margin: 0 auto; }

header {
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.92);
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.nav {
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand {
    font-weight: 700;
    font-size: 17px;
    text-decoration: none;
    color: var(--ink);
    letter-spacing: -0.3px;
}

.nav-links { display: flex; gap: 20px; }

.nav-links a {
    font-weight: 600;
    font-size: 14px;
    text-decoration: none;
    color: var(--muted);
    padding: 4px 0;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.nav-links a.active,
.nav-links a:hover {
    color: var(--ink);
    border-bottom-color: var(--accent);
    text-decoration: none;
}

main { padding: 48px 0 64px; }

h1 {
    font-size: clamp(28px, 5vw, 40px);
    font-weight: 800;
    color: var(--ink);
    line-height: 1.15;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--ink);
    margin: 40px 0 12px;
    letter-spacing: -0.3px;
}

h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--ink);
    margin: 24px 0 8px;
}

p, li { margin-bottom: 12px; }
ul, ol { padding-left: 20px; }
li { margin-bottom: 8px; }

.meta { color: var(--muted); font-size: 14px; margin-bottom: 32px; }

.notice {
    border: 1px solid #fed7aa;
    border-radius: var(--radius);
    padding: 16px 20px;
    background: #fffbeb;
    color: #92400e;
    font-weight: 600;
    font-size: 15px;
    margin: 24px 0;
    line-height: 1.5;
}

.info-box {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 16px 20px;
    background: var(--panel);
    margin: 16px 0;
    font-size: 15px;
}

.info-box strong { color: var(--ink); }

.sub-box {
    border: 1px solid #bee3f8;
    border-radius: var(--radius);
    padding: 20px;
    background: #ebf8ff;
    margin: 20px 0;
}

.sub-box h3 { margin-top: 0; color: #2b6cb0; }
.sub-box ul { margin-bottom: 0; }

table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 14px;
}

th, td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--line);
}

th {
    background: var(--panel);
    font-weight: 600;
    color: var(--ink);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

footer {
    border-top: 1px solid var(--line);
    padding: 24px 0;
    color: var(--muted);
    font-size: 14px;
}

footer a { color: var(--muted); }

@media (max-width: 600px) {
    .nav { flex-direction: column; align-items: flex-start; padding: 12px 0; }
    .nav-links { gap: 14px; }
}