* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: #374151;
    background: #f8fafc;
    line-height: 1.7;
}

a {
    color: #0043d3;
    text-decoration: none;
}

a:hover,
a:focus {
    text-decoration: underline;
}

.page-shell {
    min-height: 100vh;
}

.hero {
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
    border-bottom: 1px solid #e5e7eb;
}

.hero-inner,
.content,
.footer {
    width: min(960px, calc(100% - 48px));
    margin: 0 auto;
}

.hero-inner {
    padding: 48px 0 32px;
}

.eyebrow {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 999px;
    background: #dcfce7;
    color: #166534;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

h1 {
    margin: 18px 0 8px;
    color: #111827;
    font-size: clamp(2rem, 4vw, 3rem);
    line-height: 1.1;
}

.subtitle {
    margin: 0;
    max-width: 760px;
    font-size: 1.05rem;
    color: #4b5563;
}

.meta {
    margin-top: 16px;
    font-size: 0.95rem;
    color: #6b7280;
}

.content {
    padding: 32px 0 56px;
}

.card {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 24px;
    padding: 32px;
    box-shadow: 0 12px 40px rgba(15, 23, 42, 0.06);
}

.toc {
    margin: 0 0 28px;
    padding: 20px 24px;
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 18px;
}

.toc-title {
    margin: 0 0 10px;
    color: #111827;
    font-size: 0.95rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.toc ul {
    margin: 0;
    padding-left: 20px;
}

.toc li {
    margin-bottom: 6px;
}

h2 {
    margin: 32px 0 12px;
    color: #111827;
    font-size: 1.4rem;
    line-height: 1.25;
}

h3 {
    margin: 22px 0 10px;
    color: #1f2937;
    font-size: 1.05rem;
}

p {
    margin: 0 0 14px;
}

ul,
ol {
    margin: 0 0 18px;
    padding-left: 22px;
}

li {
    margin-bottom: 8px;
}

strong {
    color: #111827;
}

.note {
    margin: 18px 0 24px;
    padding: 16px 18px;
    border-left: 4px solid #00e8ab;
    background: #f0fdf4;
    border-radius: 12px;
}

.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.link-card {
    display: block;
    padding: 20px;
    border: 1px solid #e5e7eb;
    border-radius: 18px;
    background: #ffffff;
    color: inherit;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.link-card:hover,
.link-card:focus {
    transform: translateY(-1px);
    border-color: #c7d2fe;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
    text-decoration: none;
}

.link-card h2 {
    margin: 0 0 8px;
    font-size: 1.05rem;
}

.link-card p {
    margin: 0;
    color: #6b7280;
    font-size: 0.95rem;
}

.footer {
    padding: 0 0 48px;
    color: #6b7280;
    font-size: 0.95rem;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 12px;
}

@media (max-width: 640px) {
    .hero-inner,
    .content,
    .footer {
        width: min(100% - 32px, 960px);
    }

    .hero-inner {
        padding-top: 32px;
    }

    .card {
        padding: 22px;
        border-radius: 20px;
    }
}