:root{--bg: #f8fafc;--surface: #ffffff;--surface-alt: rgba(255,255,255,.9);--fg: #0f172a;--muted: #475569;--border: #e2e8f0;--ring: #c7d2fe;--purple-600: #7c3aed;--purple-700: #6b21a8}html[data-theme=dark]{--bg: #0b1020;--surface: #111827;--surface-alt: rgba(17,24,39,.92);--fg: #e5e7eb;--muted: #a3a3a3;--border: rgba(148,163,184,.22);--ring: rgba(124,58,237,.35)}*,*:before,*:after{box-sizing:border-box}html,body{height:100%}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;background:var(--bg);color:var(--fg)}.container{max-width:1100px;margin:0 auto;padding:18px}.header{background:var(--surface);border-bottom:1px solid var(--border)}.header-container{display:flex;align-items:center;justify-content:space-between}.logo-section{display:flex;align-items:center;gap:10px;text-decoration:none}.logo-img{width:36px;height:36px;border-radius:8px;object-fit:contain;background:transparent;animation:float 8s ease-in-out infinite}.logo-text 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640px){.header-container{flex-direction:column;align-items:center;gap:12px}.logo-section{width:100%;justify-content:center}.logo-text{text-align:center}.logo-text .logo{font-size:20px}.header-nav{width:100%;display:flex;justify-content:center}.header-actions{width:100%;justify-content:center;flex-wrap:wrap;gap:8px}.header-actions .btn{padding:8px 12px;min-height:34px;font-size:13px;border-radius:10px}}