* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .container {
            background: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            width: 100%;
            max-width: 400px;
            animation: slideIn 0.5s ease-out;
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .tab-buttons {
            display: flex;
            margin-bottom: 2rem;
            background: #f5f5f5;
            border-radius: 8px;
            padding: 4px;
        }

        .tab-button {
            flex: 1;
            padding: 12px;
            border: none;
            background: transparent;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .tab-button.active {
            background: #667eea;
            color: white;
            box-shadow: 0 2px 4px rgba(102, 126, 234, 0.3);
        }

        .form-section {
            animation: fadeIn 0.3s ease-in;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        .form-group {
            margin-bottom: 1.5rem;
        }

        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #333;
        }

        input {
            width: 100%;
            padding: 12px 16px;
            border: 2px solid #e1e5e9;
            border-radius: 8px;
            font-size: 16px;
            transition: border-color 0.3s ease;
        }

        input:focus {
            outline: none;
            border-color: #667eea;
        }

        .btn {
            width: 100%;
            padding: 14px;
            background: #667eea;
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .btn:hover:not(:disabled) {
            background: #5a67d8;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
        }

        .btn:disabled {
            background: #cbd5e0;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }

        .message {
            padding: 12px;
            border-radius: 8px;
            margin-bottom: 1rem;
            font-weight: 500;
        }

        .error {
            background: #fed7d7;
            color: #c53030;
            border: 1px solid #feb2b2;
        }

        .success {
            background: #c6f6d5;
            color: #2f855a;
            border: 1px solid #9ae6b4;
        }

        .user-info {
            background: #e6fffa;
            border: 1px solid #81e6d9;
            padding: 1rem;
            border-radius: 8px;
            margin-bottom: 1rem;
        }

        .logout-btn {
            background: #e53e3e;
            margin-top: 1rem;
        }

        .logout-btn:hover:not(:disabled) {
            background: #c53030;
        }

        .resend-link {
            color: #667eea;
            text-decoration: none;
            font-weight: 600;
            cursor: pointer;
        }

        .resend-link:hover {
            text-decoration: underline;
        }

        .loading {
            width: 20px;
            height: 20px;
            border: 2px solid #f3f3f3;
            border-top: 2px solid #667eea;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .verification-info {
            text-align: center;
            padding: 1rem;
            background: #f7fafc;
            border-radius: 8px;
            margin-bottom: 1rem;
        }

        .code-input {
            text-align: center !important;
            font-size: 18px !important;
            font-weight: bold !important;
            letter-spacing: 2px !important;
        }