:root { --bg: #0b1020; --card: #121836; --text: #e7ebff; --muted: #9aa3c7; --accent: #5e8bff; }
* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif; background: var(--bg); color: var(--text); }
.container { max-width: 960px; margin: 0 auto; padding: 1rem; }
.site-header { background: linear-gradient(135deg, #0b1020 0%, #1b2450 100%); border-bottom: 1px solid #1f2a62; position: sticky; top: 0; z-index: 10; }
.site-header h1 { margin: 0.5rem 0; font-weight: 800; }
.subtitle { color: var(--muted); margin: 0.25rem 0 0.75rem; }
nav a { color: var(--text); text-decoration: none; margin-right: 1rem; opacity: 0.9; }
nav a:hover { color: var(--accent); }
.card { background: var(--card); border: 1px solid #1f2a62; border-radius: 12px; padding: 1rem; margin: 1rem 0; box-shadow: 0 8px 24px rgba(0,0,0,0.25); }
.btn { background: var(--accent); color: white; border: none; padding: 0.7rem 1rem; border-radius: 8px; font-weight: 600; cursor: pointer; }
.btn:hover { filter: brightness(1.1); }
.banner { margin-top: 1rem; padding: 0.75rem 1rem; border-radius: 10px; background: #173063; color: #bcd1ff; border: 1px dashed #5e8bff; }
.hidden { display: none; }
.site-footer { border-top: 1px solid #1f2a62; padding: 1rem 0; text-align: center; color: var(--muted); }