:root {
    --color-bg: #0f1117;
    --color-surface: #1a1d27;
    --color-border: #2a2d3a;
    --color-text: #e0e0e8;
    --color-text-muted: #8888a0;
    --color-primary: #6c8cff;
    --color-primary-hover: #8aa4ff;
    --color-accent: #ff6c8c;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    --radius: 8px;
    --max-width: 900px;
    --transition: 0.2s ease;
}
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: var(--font-sans); background-color: var(--color-bg); color: var(--color-text); line-height: 1.7; min-height: 100vh; display: flex; flex-direction: column; }
header { background: var(--color-surface); border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 100; }
nav { max-width: var(--max-width); margin: 0 auto; padding: 0.75rem 1.5rem; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
nav .logo { display: flex; align-items: center; gap: 0.5rem; font-weight: 700; font-size: 1.1rem; color: var(--color-primary); text-decoration: none; }
nav ul { display: flex; list-style: none; gap: 1.5rem; }
nav ul a { color: var(--color-text-muted); text-decoration: none; font-size: 0.9rem; }
main { max-width: var(--max-width); margin: 0 auto; padding: 2rem 1.5rem; flex: 1; width: 100%; }
section { margin-bottom: 3rem; }
h1 { font-size: 2rem; font-weight: 800; margin-bottom: 1rem; color: #fff; }
h2 { font-size: 1.4rem; font-weight: 700; margin-top: 2rem; margin-bottom: 0.75rem; color: var(--color-primary); }
h3 { font-size: 1.1rem; font-weight: 600; margin-top: 1.5rem; margin-bottom: 0.5rem; }
p { margin-bottom: 1rem; color: var(--color-text-muted); }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-hover); text-decoration: underline; }
ul, ol { margin-bottom: 1rem; padding-left: 1.5rem; }
li { margin-bottom: 0.4rem; color: var(--color-text-muted); }
li a { font-family: var(--font-mono); font-size: 0.9rem; }
.banner { width: 100%; height: auto; border-radius: var(--radius); margin-bottom: 1.5rem; border: 1px solid var(--color-border); }
.diagram, .photo { max-width: 100%; height: auto; border-radius: var(--radius); margin: 1rem 0; border: 1px solid var(--color-border); }
.error-page { text-align: center; padding: 4rem 1rem; }
.error-page h1 { font-size: 3rem; color: var(--color-accent); }
footer { background: var(--color-surface); border-top: 1px solid var(--color-border); padding: 1.5rem; text-align: center; }
footer p { font-size: 0.85rem; color: var(--color-text-muted); }