@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";:root{--bg-gradient-start:#f8fafc;--bg-gradient-end:#e2e8f0;--primary:#4f46e5;--primary-hover:#4338ca;--success:#10b981;--danger:#ef4444;--warning:#f59e0b;--surface:#ffffffd9;--surface-border:#00000014;--surface-hover:#00000008;--text-main:#1e293b;--text-muted:#64748b;--option-bg:#fff9;--option-bg-selected:#4f46e51a;--option-bg-correct:#10b9811a;--option-bg-wrong:#ef44441a;--answer-box-bg:#00000008;--font-sans:"Inter", system-ui, -apple-system, sans-serif;--shadow-lg:0 10px 15px -3px #0000000d, 0 4px 6px -4px #0000000d;--glass-blur:blur(12px);--transition:all .3s cubic-bezier(.4, 0, .2, 1);--radius:12px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background:linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));color:var(--text-main);-webkit-font-smoothing:antialiased;background-attachment:fixed;min-height:100vh}.glass-card{background:var(--surface);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--surface-border);border-radius:var(--radius);box-shadow:var(--shadow-lg)}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:#0000000d}::-webkit-scrollbar-thumb{background:#00000026;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#00000040}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:.4s ease-out forwards fadeIn}input[type=number],input[type=text],input[type=file]{border:1px solid var(--surface-border);color:var(--text-main);font-family:var(--font-sans);transition:var(--transition);background:#fffc;border-radius:8px;padding:8px 12px}input[type=number]:focus,input[type=text]:focus{border-color:var(--primary);outline:none;box-shadow:0 0 0 2px #4f46e54d}.custom-btn{font-family:var(--font-sans);cursor:pointer;transition:var(--transition);border:none;border-radius:8px;justify-content:center;align-items:center;gap:8px;font-weight:500;display:inline-flex}.custom-btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 4px 6px -1px #4f46e54d}.btn-primary:not(:disabled):hover{background:var(--primary-hover);transform:translateY(-1px);box-shadow:0 6px 8px -1px #4f46e566}.btn-secondary{color:var(--text-main);border:1px solid var(--surface-border);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#ffffff80}.btn-secondary:not(:disabled):hover{background:#fffc}.btn-danger{background:var(--danger);color:#fff}.btn-danger:not(:disabled):hover{background:#dc2626;transform:translateY(-1px)}.btn-success{background:var(--success);color:#fff}.btn-success:not(:disabled):hover{background:#059669;transform:translateY(-1px)}.btn-sm{padding:6px 12px;font-size:.875rem}.btn-md{padding:10px 16px;font-size:1rem}.btn-lg{padding:14px 24px;font-size:1.125rem}.btn-full{width:100%}