body{background-color:#121212;margin:0;padding:0}:root,.theme-dark{color-scheme:dark;--bg: #121212;--surface: #1e1e1e;--text: #e6e6e6;--muted: #a7a7a7;--card: #0e0e10;--border: rgba(255,255,255,.08);--brand: #2196f3;--success: #2ecc71;--warning: #f1c40f;--danger: #e74c3c}.theme-light{color-scheme:light;--bg: #f7f9fc;--surface: #ffffff;--text: #111827;--muted: #6b7280;--card: #ffffff;--border: rgba(17,24,39,.08);--brand: #2563eb;--success: #16a34a;--warning: #ca8a04;--danger: #dc2626}html,body{background:var(--bg);color:var(--text)}.header-container .icon-button{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text);margin:0 6px;cursor:pointer;transition:transform .06s ease,background-color .25s ease,border-color .25s ease}.header-container .icon-button:hover{background:var(--card);border-color:#ffffff2e}.header-container .icon-button:active{transform:translateY(1px)}