:root {
            --primary: #1a1a2e;
            --secondary: #16213e;
            --accent: #0f3460;
            --highlight: #e94560;
            --success: #10b981;
            --warning: #f59e0b;
            --light: #f8fafc;
            --white: #ffffff;
            --gray-100: #f1f5f9;
            --gray-200: #e2e8f0;
            --gray-300: #cbd5e1;
            --gray-400: #94a3b8;
            --gray-500: #64748b;
            --gray-600: #475569;
            --gray-700: #334155;
            --gray-800: #1e293b;
            --gray-900: #0f172a;

            --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
            --gradient-accent: linear-gradient(135deg, var(--highlight) 0%, #ff6b7d 100%);
            --gradient-light: linear-gradient(135deg, var(--white) 0%, var(--gray-100) 100%);

            --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
            --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
            --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
            --shadow-glow: 0 0 20px rgba(233, 69, 96, 0.3);

            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 24px;
        }

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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            background: var(--gradient-primary);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .auth-container {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 100%;
        }

        .auth-box {
            background: var(--white);
            padding: 40px;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-xl);
            width: 100%;
            max-width: 400px;
            animation: fadeInUp 0.6s ease;
        }

        .auth-header {
            text-align: center;
            margin-bottom: 30px;
        }

        .auth-header h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary);
        }

        .auth-header p {
            color: var(--gray-500);
            font-size: 14px;
            margin-top: 5px;
        }

        .auth-form .form-group {
            margin-bottom: 20px;
        }

        .auth-form label {
            display: block;
            font-size: 14px;
            font-weight: 500;
            margin-bottom: 8px;
            color: var(--gray-700);
        }

        .auth-form input {
            width: 100%;
            padding: 12px;
            border: 1px solid var(--gray-300);
            border-radius: var(--radius-md);
            font-size: 14px;
            transition: all 0.3s ease;
        }

        .auth-form input:focus {
            outline: none;
            border-color: var(--highlight);
            box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.2);
        }

        .btn-primary {
            width: 100%;
            padding: 12px;
            border: none;
            border-radius: var(--radius-md);
            background: var(--gradient-accent);
            color: var(--white);
            font-weight: 600;
            font-size: 15px;
            cursor: pointer;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-glow);
        }

        .alert {
            padding: 12px;
            border-radius: var(--radius-md);
            margin-bottom: 15px;
            font-size: 14px;
            text-align: center;
        }

        .alert-error {
            background: #fee2e2;
            color: #b91c1c;
        }

        .alert-success {
            background: #d1fae5;
            color: #065f46;
        }

        .auth-footer {
            text-align: center;
            margin-top: 20px;
            font-size: 14px;
        }

        .auth-footer a {
            color: var(--highlight);
            text-decoration: none;
            font-weight: 600;
        }

        .auth-footer a:hover {
            text-decoration: underline;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .form-group input::placeholder {
    color: var(--gray-400);
    font-size: 13px;
}

.form-group {
    position: relative;
}

.form-group input:invalid:not(:focus):not(:placeholder-shown) {
    border-color: #ef4444;
    background-color: #fef2f2;
}

.form-group input:valid:not(:focus):not(:placeholder-shown) {
    border-color: var(--success);
    background-color: #f0fdf4;
}

.btn-primary i {
    margin-right: 8px;
}

/* Real-time validation styling */
.validation-message {
    font-size: 12px;
    margin-top: 5px;
    padding: 4px 0;
}

.validation-message.error {
    color: #ef4444;
}

.validation-message.success {
    color: var(--success);
}