/* Estilo común de las guías. Mismos colores y tipografías que el validador (index.html). */
:root {
    --bg-body: #0A0E17;
    --bg-card: rgba(17, 24, 39, 0.85);
    --bg-code: #0F172A;
    --border: rgba(255, 255, 255, 0.08);
    --accent-blue: #3B82F6;
    --accent-cyan: #06B6D4;
    --accent-emerald: #10B981;
    --accent-rose: #F43F5E;
    --accent-amber: #F59E0B;
    --text-main: #F9FAFB;
    --text-body: #D1D5DB;
    --text-muted: #9CA3AF;
    --font-sans: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;
}

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

body {
    background-color: var(--bg-body);
    color: var(--text-body);
    font-family: var(--font-sans);
    line-height: 1.7;
    font-size: 1.0625rem;
    background-image:
        radial-gradient(circle at 10% 0%, rgba(59, 130, 246, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 90% 100%, rgba(16, 185, 129, 0.05) 0%, transparent 40%);
    background-attachment: fixed;
}

a { color: var(--accent-cyan); text-underline-offset: 3px; }
a:hover { color: #67E8F9; }

.site-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
    background: rgba(10, 14, 23, 0.92);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 50;
}
.site-header-inner {
    max-width: 760px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 0.6rem; color: var(--text-main); text-decoration: none; font-weight: 800; letter-spacing: -0.02em; }
.brand:hover { color: var(--text-main); }
.brand-icon {
    width: 32px; height: 32px; border-radius: 9px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-emerald));
    display: flex; align-items: center; justify-content: center; color: #fff; font-size: 0.95rem;
}
.site-nav { display: flex; gap: 1rem; font-size: 0.9rem; font-weight: 600; }
.site-nav a { color: var(--text-muted); text-decoration: none; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--text-main); }

main { max-width: 760px; margin: 0 auto; padding: 2rem 1.25rem 4rem; }

.breadcrumb { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 1.25rem; }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--text-main); }

h1 {
    color: var(--text-main);
    font-size: clamp(1.75rem, 4vw, 2.35rem);
    line-height: 1.2;
    letter-spacing: -0.025em;
    font-weight: 800;
    margin-bottom: 0.75rem;
}
.lede { font-size: 1.15rem; color: var(--text-body); margin-bottom: 0.75rem; }
.meta { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 2rem; }

h2 {
    color: var(--text-main);
    font-size: 1.45rem;
    line-height: 1.3;
    letter-spacing: -0.015em;
    margin: 2.5rem 0 0.75rem;
    scroll-margin-top: 7.5rem;
}
h3 { color: var(--text-main); font-size: 1.1rem; margin: 1.75rem 0 0.5rem; scroll-margin-top: 7.5rem; }

p, ul, ol, table, pre, .callout, .card { margin-bottom: 1rem; }
ul, ol { padding-left: 1.4rem; }
li { margin-bottom: 0.35rem; }
li::marker { color: var(--text-muted); }
strong { color: var(--text-main); }

code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: rgba(148, 163, 184, 0.12);
    border: 1px solid var(--border);
    padding: 0.1em 0.35em;
    border-radius: 5px;
    color: #E5E7EB;
    overflow-wrap: anywhere;
}
pre {
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1rem;
    overflow-x: auto;
    font-size: 0.85rem;
    line-height: 1.6;
}
pre code { background: none; border: 0; padding: 0; white-space: pre-wrap; word-break: break-all; }

.table-wrap { overflow-x: auto; margin-bottom: 1rem; }
table { width: 100%; border-collapse: collapse; font-size: 0.93rem; }
th, td { text-align: left; padding: 0.6rem 0.75rem; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--text-main); font-weight: 700; background: rgba(255, 255, 255, 0.03); }
td code { white-space: nowrap; }

.callout {
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent-blue);
    background: var(--bg-card);
    border-radius: 10px;
    padding: 1rem 1.1rem;
}
.callout p:last-child, .callout ul:last-child { margin-bottom: 0; }
.callout.warn { border-left-color: var(--accent-amber); }
.callout.ok { border-left-color: var(--accent-emerald); }
.callout-title { display: block; color: var(--text-main); font-weight: 700; margin-bottom: 0.35rem; }

.toc {
    border: 1px solid var(--border);
    background: var(--bg-card);
    border-radius: 10px;
    padding: 1rem 1.1rem;
    margin-bottom: 2rem;
    font-size: 0.95rem;
}
.toc strong { display: block; margin-bottom: 0.4rem; }
.toc ol { margin-bottom: 0; }

.cta {
    margin-top: 2.5rem;
    border: 1px solid rgba(6, 182, 212, 0.3);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.12), rgba(16, 185, 129, 0.08));
    border-radius: 12px;
    padding: 1.25rem;
}
.cta h2 { margin-top: 0; font-size: 1.2rem; }
.cta p:last-child { margin-bottom: 0; }
.btn {
    display: inline-block;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    font-weight: 700;
    font-size: 0.93rem;
    text-decoration: none;
    margin: 0.25rem 0.5rem 0.25rem 0;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    color: #fff;
}
.btn:hover { color: #fff; filter: brightness(1.1); }
.btn.secondary { background: transparent; border: 1px solid var(--border); color: var(--text-main); }

.card-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); margin-bottom: 1rem; }
.card {
    display: block;
    border: 1px solid var(--border);
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1.1rem;
    text-decoration: none;
    color: var(--text-body);
    margin-bottom: 0;
}
.card:hover { border-color: rgba(6, 182, 212, 0.45); color: var(--text-body); }
.card strong { display: block; font-size: 1.05rem; margin-bottom: 0.35rem; line-height: 1.35; }
.card span { font-size: 0.92rem; color: var(--text-muted); }

.related { margin-top: 2.5rem; }
.related h2 { font-size: 1.15rem; }

.site-footer {
    border-top: 1px solid var(--border);
    padding: 1.5rem 1.25rem 2.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}
.site-footer p { max-width: 760px; margin: 0 auto 0.5rem; }

@media (max-width: 520px) {
    body { font-size: 1rem; }
    .site-nav { gap: 0.75rem; font-size: 0.85rem; }
    th, td { padding: 0.5rem; }
}