:root{--bg: #f8fafc;--bg-card: #ffffff;--bg-hover: #f1f5f9;--text: #0f172a;--text-muted: #64748b;--border: #e2e8f0;--green: #16a34a;--yellow: #d97706;--orange: #ea580c;--red: #dc2626;--blue: #2563eb;--gray: #94a3b8;--brand: #2563eb;--radius: 8px}.dark{--bg: #0f172a;--bg-card: #1e293b;--bg-hover: #334155;--text: #f1f5f9;--text-muted: #94a3b8;--border: #334155}*,*:before,*:after{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);transition:background .2s,color .2s}.app{min-height:100vh;display:flex;flex-direction:column;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.site-header{background:var(--bg-card);border-bottom:1px solid var(--border);padding:0 1.5rem;position:sticky;top:0;z-index:10;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#ffffffd9}.dark .site-header{background:#1e293be6}.header-inner{max-width:900px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;height:52px}.brand{display:flex;align-items:center;gap:.5rem;text-decoration:none;color:var(--text)}.brand-icon{width:28px;height:28px;display:flex;align-items:center;justify-content:center;background:var(--brand);color:#fff;font-weight:800;font-size:.9rem;border-radius:6px}.brand-name{font-weight:700;font-size:1.05rem}.header-nav{display:flex;align-items:center;gap:.25rem}.nav-link{padding:.35rem .65rem;font-size:.8rem;font-weight:500;color:var(--text-muted);text-decoration:none;border-radius:6px;transition:all .15s}.nav-link:hover{color:var(--text);background:var(--bg-hover)}.nav-link--active{color:var(--brand);background:#2563eb14;font-weight:600}.header-right{display:flex;align-items:center;gap:.75rem}.theme-toggle{background:none;border:1px solid var(--border);border-radius:6px;padding:.25rem .5rem;cursor:pointer;font-size:1rem;color:var(--text-muted);transition:background .15s}.theme-toggle:hover{background:var(--bg-hover)}.site-footer{border-top:1px solid var(--border);padding:1.5rem;margin-top:auto}.footer-inner{max-width:900px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;font-size:.8rem;color:var(--text-muted)}.footer-brand{margin:0}.footer-links{display:flex;gap:1rem}.footer-links a{color:var(--text-muted);text-decoration:none;font-weight:500}.footer-links a:hover{color:var(--brand)}.page{max-width:900px;width:100%;margin:0 auto;padding:0 1.5rem;flex:1}@media(max-width:640px){.header-nav{gap:0}.nav-link{padding:.3rem .4rem;font-size:.75rem}.footer-inner{flex-direction:column;gap:.75rem;text-align:center}}