:root{color-scheme:light}[data-theme=dark]{color-scheme:dark}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--color-primary: #2563eb;--color-primary-dark: #1d4ed8;--color-danger: #dc2626;--color-danger-dark: #b91c1c;--color-bg: #f8fafc;--color-surface: #ffffff;--color-text: #0f172a;--color-text-secondary: #64748b;--color-border: #e2e8f0;--color-placeholder: #f1f5f9;--color-error-bg: #fef2f2;--color-error-border: #fca5a5;--color-error-text: #991b1b;--color-highlight-bg: #ecfdf5;--color-highlight-border: #10b981;--color-warning-bg: #fffbeb;--color-warning-border: #fde68a;--radius: 12px}[data-theme=dark]{--color-primary: #3b82f6;--color-primary-dark: #2563eb;--color-danger: #ef4444;--color-danger-dark: #dc2626;--color-bg: #0f172a;--color-surface: #1e293b;--color-text: #f1f5f9;--color-text-secondary: #94a3b8;--color-border: #334155;--color-placeholder: #334155;--color-error-bg: #451a1a;--color-error-border: #7f1d1d;--color-error-text: #fca5a5;--color-highlight-bg: #064e3b;--color-highlight-border: #10b981;--color-warning-bg: #451a03;--color-warning-border: #92400e}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--color-bg);color:var(--color-text);-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer;border:none;border-radius:var(--radius);padding:12px 20px;font-weight:600;font-size:1rem;min-height:44px;touch-action:manipulation}input{font:inherit;border:2px solid var(--color-border);border-radius:var(--radius);padding:12px 16px;font-size:1rem;min-height:44px;width:100%;background:var(--color-surface);color:var(--color-text)}input:focus{outline:none;border-color:var(--color-primary)}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:active{background:var(--color-primary-dark)}.btn-danger{background:var(--color-danger);color:#fff}.btn-danger:active{background:var(--color-danger-dark)}.btn-ghost{background:transparent;color:var(--color-text-secondary);padding:8px 12px}