*,*:before,*:after{box-sizing:border-box}.theme-btn{background:#fff3;border:none;color:#fff;padding:.75rem;min-width:44px;min-height:44px;border-radius:8px;font-size:1.1rem;cursor:pointer;transition:all .2s ease;display:flex;align-items:center;justify-content:center;touch-action:manipulation;-webkit-tap-highlight-color:transparent}.theme-btn:hover{background:#ffffff4d;transform:translateY(-1px)}.input-label{font-size:.9rem;font-weight:600;color:var(--primary-600);margin-bottom:.25rem}.helper-text{font-size:.85rem;color:var(--muted)}*{margin:0;padding:0}html{color-scheme:light}:root{--primary-600: #4f46e5;--primary-500: #667eea;--primary-700: #764ba2;--bg: #f8f9fa;--text: #333333;--muted: #6b7280;--surface: rgba(255, 255, 255, .95);--surface-alt: rgba(243, 244, 246, .5);--border: rgba(229, 231, 235, .5);--shadow: rgba(0, 0, 0, .04);--header-start: rgba(112, 137, 184, .92);--header-end: rgba(168, 189, 220, .92)}@media(prefers-color-scheme:dark){:root{--bg: #0f172a;--text: 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