:root {
    --ink: #1b2838;
    --heading: #3d4f61;
    --muted: #5b6b7c;
    --paper: #eaf2fa;
    --white: #fff;
    --line: #cfd8e3;
    --accent: #0056b3;
    --cta: #0d9488;
    --header: linear-gradient(135deg, #2c3e50 0%, #4a6491 100%);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: var(--paper);
    color: var(--ink);
    line-height: 1.55;
}
.top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.25rem;
    padding: 0.85rem 1.5rem;
    background: var(--header);
    color: var(--white);
    flex-wrap: wrap;
}
.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: inherit;
    text-decoration: none;
}
.brand img { height: 40px; width: auto; border-radius: 6px; background: var(--white); }
.brand strong { display: block; font-size: 1rem; }
.brand em { font-style: normal; font-size: 0.78rem; opacity: 0.85; }
.top nav { display: flex; gap: 0.9rem; flex-wrap: wrap; align-items: center; }
.top nav a {
    color: var(--white);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.92rem;
}
.top nav a:hover { text-decoration: underline; }
main {
    max-width: 860px;
    margin: 1.5rem auto 3rem;
    padding: 0 1.25rem;
}
h1 { color: var(--heading); font-size: 1.85rem; margin: 0 0 0.75rem; }
h2 {
    color: #2c3e50;
    font-size: 1.25rem;
    border-bottom: 2px solid var(--accent);
    padding-bottom: 0.35rem;
    margin: 1.75rem 0 0.65rem;
}
.lead { font-size: 1.08rem; }
.note {
    background: #fff8e6;
    border-left: 4px solid #c9a227;
    padding: 0.75rem 1rem;
    margin: 1rem 0;
}
.cta-row { display: flex; gap: 0.75rem; flex-wrap: wrap; margin: 1.25rem 0; }
.btn {
    display: inline-block;
    background: var(--cta);
    color: #fff;
    text-decoration: none;
    font-weight: 700;
    padding: 0.55rem 1rem;
    border-radius: 6px;
}
.btn.ghost {
    background: transparent;
    color: var(--accent);
    border: 2px solid var(--accent);
}
.related, .guide-index { list-style: none; padding: 0; }
.related li, .guide-index li { margin: 0.35rem 0; }
.related a, .guide-index a { font-weight: 600; color: var(--accent); }
.guide-index span { display: block; color: var(--muted); font-size: 0.92rem; font-weight: 400; }
.cluster { margin-top: 2rem; }
.cluster h2 { margin-top: 0; }
footer {
    max-width: 860px;
    margin: 0 auto;
    padding: 1.25rem;
    color: var(--muted);
    font-size: 0.9rem;
}
footer a { color: var(--accent); }
.faq dt { font-weight: 700; margin-top: 0.85rem; }
.faq dd { margin: 0.25rem 0 0; }