:root {
            --primary: #0A3A5C;
            --primary-dark: #05263D;
            --primary-light: #1D4E72;
            --primary-soft: rgba(10, 58, 92, 0.08);
            --secondary: #E67E22;
            --secondary-dark: #D35400;
            --secondary-soft: rgba(230, 126, 34, 0.1);
            --success: #10B981;
            --success-soft: rgba(16, 185, 129, 0.1);
            --danger: #EF4444;
            --danger-soft: rgba(239, 68, 68, 0.1);
            --warning: #F59E0B;
            --info: #3B82F6;
            --text-dark: #1F2937;
            --text-light: #6B7280;
            --text-white: #FFFFFF;
            --bg-light: #F9FAFB;
            --bg-white: #FFFFFF;
            --border: #E5E7EB;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
            --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
            --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
            --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.15);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 24px;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
            background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-white) 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 2rem;
        }
        
        /* Container */
        .login-container {
            max-width: 480px;
            width: 100%;
            margin: 0 auto;
        }
        
        /* Card */
        .login-card {
            background: var(--bg-white);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-xl);
            overflow: hidden;
            transition: var(--transition);
            animation: fadeInUp 0.5s ease;
        }
        
        .login-card:hover {
            box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
        }
        
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        /* Header */
        .login-header {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            padding: 2rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        
        .login-header::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
            animation: pulse 8s ease infinite;
        }
        
        @keyframes pulse {
            0%, 100% { transform: scale(1); opacity: 0.3; }
            50% { transform: scale(1.1); opacity: 0.6; }
        }
        
        .logo {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-white);
            text-decoration: none;
            position: relative;
            z-index: 1;
        }
        
        .logo svg {
            width: 32px;
            height: 32px;
        }
        
        .logo span {
            color: var(--secondary);
        }
        
        .login-header h1 {
            color: var(--text-white);
            font-size: 1.75rem;
            font-weight: 700;
            margin-top: 1rem;
            position: relative;
            z-index: 1;
        }
        
        .login-header p {
            color: rgba(255,255,255,0.8);
            font-size: 0.875rem;
            margin-top: 0.5rem;
            position: relative;
            z-index: 1;
        }
        
        /* Body */
        .login-body {
            padding: 2rem;
        }
        
        /* Form Groups */
        .form-group {
            margin-bottom: 1.5rem;
        }
        
        .form-group label {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--text-dark);
            font-size: 0.75rem;
        }
        
        .form-group label i {
            color: var(--secondary);
            font-size: 0.75rem;
        }
        
        .input-wrapper {
            position: relative;
        }
        
        .input-wrapper i.input-icon {
            position: absolute;
            left: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-light);
            font-size: 0.875rem;
            pointer-events: none;
        }
        
        .form-group input {
            width: 100%;
            padding: 0.75rem 1rem 0.75rem 2.5rem;
            border: 1.5px solid var(--border);
            border-radius: var(--radius-md);
            font-size: 0.875rem;
            font-family: inherit;
            transition: var(--transition);
            background: var(--bg-white);
        }
        
        .form-group input:focus {
            outline: none;
            border-color: var(--secondary);
            box-shadow: 0 0 0 3px var(--secondary-soft);
        }
        
        .form-group input.error {
            border-color: var(--danger);
        }
        
        .error-text {
            color: var(--danger);
            font-size: 0.7rem;
            margin-top: 0.375rem;
            display: flex;
            align-items: center;
            gap: 0.375rem;
        }
        
        .error-text i {
            font-size: 0.7rem;
        }
        
        /* Password Toggle */
        .password-toggle {
            position: absolute;
            right: 1rem;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            cursor: pointer;
            color: var(--text-light);
            font-size: 0.875rem;
            transition: var(--transition);
        }
        
        .password-toggle:hover {
            color: var(--secondary);
        }
        
        /* Forgot Password */
        .forgot-password {
            text-align: right;
            margin: -0.5rem 0 1.5rem;
        }
        
        .forgot-password a {
            color: var(--text-light);
            font-size: 0.7rem;
            text-decoration: none;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 0.25rem;
        }
        
        .forgot-password a:hover {
            color: var(--secondary);
            gap: 0.5rem;
        }
        
        /* Submit Button */
        .btn-submit {
            width: 100%;
            padding: 0.875rem;
            background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
            color: var(--text-white);
            border: none;
            border-radius: var(--radius-md);
            font-size: 0.875rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }
        
        .btn-submit:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        
        .btn-submit:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }
        
        /* Loading Spinner (Single) */
        .spinner {
            display: inline-block;
            width: 16px;
            height: 16px;
            border: 2px solid var(--text-white);
            border-top-color: transparent;
            border-radius: 50%;
            animation: spin 0.6s linear infinite;
        }
        
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        
        /* Alert Messages */
        .alert {
            padding: 0.875rem 1rem;
            border-radius: var(--radius-md);
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-size: 0.875rem;
            animation: slideIn 0.3s ease;
        }
        
        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateY(-10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .alert-success {
            background: var(--success-soft);
            border: 1px solid rgba(16, 185, 129, 0.3);
            color: var(--success);
        }
        
        .alert-error {
            background: var(--danger-soft);
            border: 1px solid rgba(239, 68, 68, 0.3);
            color: var(--danger);
        }
        
        .alert-warning {
            background: rgba(245, 158, 11, 0.1);
            border: 1px solid rgba(245, 158, 11, 0.3);
            color: var(--warning);
        }
        
        .alert-info {
            background: rgba(59, 130, 246, 0.1);
            border: 1px solid rgba(59, 130, 246, 0.3);
            color: var(--info);
        }
        
        .alert i {
            font-size: 1rem;
        }
        
        /* Auth Links */
        .auth-links {
            text-align: center;
            margin-top: 1.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid var(--border);
        }
        
        .register-link {
            margin-bottom: 0.75rem;
        }
        
        .register-link a,
        .back-link a {
            color: var(--text-light);
            text-decoration: none;
            font-size: 0.875rem;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            transition: var(--transition);
        }
        
        .register-link a:hover,
        .back-link a:hover {
            color: var(--secondary);
            gap: 0.75rem;
        }
        
        .register-link a {
            color: var(--primary);
            font-weight: 600;
        }
        
        /* Social Proof */
        .social-proof {
            margin-top: 1.5rem;
            text-align: center;
        }
        
        .social-proof p {
            font-size: 0.7rem;
            color: var(--text-light);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }
        
        .social-proof i {
            color: var(--success);
        }
        
        /* ========================================
           RESPONSIVE DESIGN
        ======================================== */
        
        @media (max-width: 768px) {
            body {
                padding: 1rem;
            }
            
            .login-header {
                padding: 1.5rem;
            }
            
            .login-header h1 {
                font-size: 1.5rem;
            }
            
            .login-body {
                padding: 1.5rem;
            }
        }
        
        @media (max-width: 480px) {
            .login-header h1 {
                font-size: 1.25rem;
            }
            
            .login-header p {
                font-size: 0.75rem;
            }
            
            .login-body {
                padding: 1.25rem;
            }
        
        .form-group label {
                font-size: 0.7rem;
            }
            
            .form-group input {
                padding: 0.625rem 0.875rem 0.625rem 2rem;
                font-size: 0.8rem;
            }
            
            .btn-submit {
                padding: 0.75rem;
                font-size: 0.8rem;
            }
        }
        
        /* Dark Mode Support */
        @media (prefers-color-scheme: dark) {
            body {
                background: var(--gray-900);
            }
            
            .login-card {
                background: var(--gray-800);
            }
            
            .form-group input {
                background: var(--gray-800);
                border-color: var(--gray-700);
                color: var(--gray-200);
            }
            
            .alert {
                background: var(--gray-800);
            }
        }
        
        /* Accessibility */
        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
            }
        }
        
        :focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
        }