:root {
    --primary-color: #0d6efd;
    --dark-color: #0f172a;
    --muted-color: #64748b;
    --soft-bg: #f8fafc;
    --border-color: #e2e8f0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: linear-gradient(135deg, #eff6ff 0%, #f8fafc 50%, #eef2ff 100%);
    color: #1e293b;
}

.hero-section {
    padding: 64px 0 32px;
}

.hero-card {
    background: linear-gradient(135deg, #0f172a 0%, #1d4ed8 100%);
    color: white;
    border: none;
    border-radius: 24px;
    overflow: hidden;
    position: relative;
}

    .hero-card::after {
        content: "";
        position: absolute;
        top: -60px;
        right: -60px;
        width: 220px;
        height: 220px;
        background: rgba(255, 255, 255, 0.08);
        border-radius: 50%;
    }

    .hero-card .card-body {
        padding: 2rem;
        position: relative;
        z-index: 1;
    }

.badge-soft {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    font-weight: 600;
    padding: 0.6rem 0.9rem;
    border-radius: 999px;
}

.sidebar-card,
.content-card {
    border: 1px solid rgba(255, 255, 255, 0.7);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
    box-shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
}

.sidebar-card {
    position: sticky;
    top: 20px;
}

.toc-link {
    display: block;
    padding: 0.7rem 0.9rem;
    margin-bottom: 0.35rem;
    border-radius: 12px;
    color: #475569;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
}

    .toc-link:hover,
    .toc-link.active {
        background: #e7f1ff;
        color: var(--primary-color);
    }

.section-block {
    padding: 1.75rem 0;
    border-bottom: 1px solid var(--border-color);
    scroll-margin-top: 90px;
}

    .section-block:last-child {
        border-bottom: none;
    }

.section-title {
    font-size: 1.7rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 1rem;
}

.info-box {
    border: 1px solid var(--border-color);
    border-radius: 18px;
    background: #fff;
    height: 100%;
}

.notice-box {
    border: 1px solid #bfdbfe;
    background: #eff6ff;
    color: #1e3a8a;
    border-radius: 16px;
}

.contact-box {
    border: 1px solid #cbd5e1;
    border-radius: 18px;
    background: linear-gradient(135deg, #eff6ff, #f8fafc);
}

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

@media (max-width: 991.98px) {
    .sidebar-card {
        position: static;
    }

    .hero-card .card-body {
        padding: 1.5rem;
    }
}