:root {
            /* Modern color palette */
            --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;
            
            /* Gradients */
            --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%);
            
            /* Shadows */
            --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);
            
            /* Border radius */
            --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;
            position: relative;
            overflow-x: hidden;
        }

        /* Animated background elements */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: 
                radial-gradient(circle at 20% 80%, rgba(233, 69, 96, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.1) 0%, transparent 50%);
            z-index: -1;
            animation: backgroundShift 20s ease-in-out infinite;
        }

        @keyframes backgroundShift {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.8; transform: scale(1.1); }
        }

        /* Floating particles */
        .particles {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
            z-index: -1;
        }

        .particle {
            position: absolute;
            width: 4px;
            height: 4px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            animation: float 15s infinite linear;
        }

        .particle:nth-child(1) { left: 10%; animation-delay: 0s; }
        .particle:nth-child(2) { left: 20%; animation-delay: 2s; }
        .particle:nth-child(3) { left: 30%; animation-delay: 4s; }
        .particle:nth-child(4) { left: 40%; animation-delay: 6s; }
        .particle:nth-child(5) { left: 50%; animation-delay: 8s; }
        .particle:nth-child(6) { left: 60%; animation-delay: 10s; }
        .particle:nth-child(7) { left: 70%; animation-delay: 12s; }
        .particle:nth-child(8) { left: 80%; animation-delay: 14s; }

        @keyframes float {
            0% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
            10% { opacity: 1; }
            90% { opacity: 1; }
            100% { transform: translateY(-100vh) rotate(360deg); opacity: 0; }
        }

        .login-container {
            background: var(--gradient-light);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: var(--radius-xl);
            padding: 2.5rem;
            width: 100%;
            max-width: 420px;
            box-shadow: var(--shadow-xl);
            position: relative;
            animation: slideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1);
            overflow: hidden;
        }

        .login-container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--gradient-accent);
            border-radius: var(--radius-xl) var(--radius-xl) 0 0;
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .login-header {
            text-align: center;
            margin-bottom: 2rem;
        }

        .logo {
            width: 64px;
            height: 64px;
            background: var(--gradient-accent);
            border-radius: var(--radius-lg);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1rem;
            box-shadow: var(--shadow-lg);
            animation: pulse 2s infinite;
        }

        .logo i {
            font-size: 28px;
            color: var(--white);
        }

        @keyframes pulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.05); }
        }

        .login-title {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--gray-900);
            margin-bottom: 0.5rem;
            background: linear-gradient(135deg, var(--primary), var(--highlight));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .login-subtitle {
            font-size: 0.875rem;
            color: var(--gray-600);
            font-weight: 400;
        }

        .input-group {
            margin-bottom: 1.5rem;
            position: relative;
        }

        .input-label {
            display: block;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--gray-700);
            margin-bottom: 0.5rem;
        }

        .input-wrapper {
            position: relative;
        }

        .input-icon {
            position: absolute;
            left: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--gray-400);
            font-size: 1rem;
            z-index: 2;
            transition: all 0.3s ease;
        }

        .form-input {
            width: 100%;
            padding: 0.875rem 1rem 0.875rem 2.75rem;
            border: 2px solid var(--gray-200);
            border-radius: var(--radius-md);
            font-size: 1rem;
            background: var(--white);
            transition: all 0.3s ease;
            outline: none;
        }

        .form-input:focus {
            border-color: var(--highlight);
            box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.1);
            transform: translateY(-2px);
        }

        .form-input:focus + .input-icon {
            color: var(--highlight);
            transform: translateY(-50%) scale(1.1);
        }

        .password-toggle {
            position: absolute;
            right: 1rem;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: var(--gray-400);
            cursor: pointer;
            font-size: 1rem;
            padding: 0.25rem;
            border-radius: var(--radius-sm);
            transition: all 0.3s ease;
        }

        .password-toggle:hover {
            color: var(--highlight);
            background: rgba(233, 69, 96, 0.1);
        }

        .login-button {
            width: 100%;
            background: var(--gradient-accent);
            color: var(--white);
            border: none;
            padding: 1rem;
            border-radius: var(--radius-md);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
            margin-bottom: 1.5rem;
        }

        .login-button::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: left 0.5s ease;
        }

        .login-button:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg), var(--shadow-glow);
        }

        .login-button:hover::before {
            left: 100%;
        }

        .login-button:active {
            transform: translateY(0);
        }

        .divider {
            position: relative;
            text-align: center;
            margin: 1.5rem 0;
        }

        .divider::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 0;
            right: 0;
            height: 1px;
            background: var(--gray-200);
        }

        .divider-text {
            background: var(--white);
            padding: 0 1rem;
            color: var(--gray-500);
            font-size: 0.875rem;
            font-weight: 500;
        }

        .social-login {
            display: flex;
            gap: 1rem;
            margin-bottom: 1.5rem;
        }

        .social-btn {
            flex: 1;
            padding: 0.875rem;
            border: 2px solid var(--gray-200);
            border-radius: var(--radius-md);
            background: var(--white);
            color: var(--gray-600);
            text-decoration: none;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 500;
            transition: all 0.3s ease;
        }

        .social-btn:hover {
            border-color: var(--highlight);
            color: var(--highlight);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .social-btn i {
            margin-right: 0.5rem;
            font-size: 1.1rem;
        }

        .footer {
            text-align: center;
            color: var(--gray-600);
            font-size: 0.875rem;
        }

        .footer a {
            color: var(--highlight);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
        }

        .footer a:hover {
            color: var(--primary);
            text-decoration: underline;
        }

        .footer-divider {
            margin: 0.5rem 0;
        }

        /* Mobile Responsive Design */
        @media (max-width: 768px) {
            body {
                padding: 1rem;
            }
            
            .login-container {
                padding: 2rem 1.5rem;
                max-width: 100%;
                margin: 0 1rem;
            }
            
            .login-title {
                font-size: 1.5rem;
            }
            
            .logo {
                width: 56px;
                height: 56px;
            }
            
            .logo i {
                font-size: 24px;
            }
            
            .form-input {
                padding: 0.75rem 1rem 0.75rem 2.5rem;
                font-size: 16px; /* Prevent zoom on iOS */
            }
            
            .login-button {
                padding: 0.875rem;
                font-size: 1rem;
            }
            
            .social-login {
                flex-direction: column;
                gap: 0.75rem;
            }
            
            .social-btn {
                padding: 0.75rem;
            }
        }

        @media (max-width: 480px) {
            .login-container {
                padding: 1.5rem 1rem;
                border-radius: var(--radius-lg);
            }
            
            .login-title {
                font-size: 1.25rem;
                line-height: 1.3;
            }
            
            .login-subtitle {
                font-size: 0.8rem;
            }
            
            .logo {
                width: 48px;
                height: 48px;
                margin-bottom: 0.75rem;
            }
            
            .logo i {
                font-size: 20px;
            }
            
            .input-group {
                margin-bottom: 1.25rem;
            }
            
            .form-input {
                padding: 0.75rem 1rem 0.75rem 2.25rem;
            }
            
            .input-icon {
                left: 0.75rem;
                font-size: 0.875rem;
            }
            
            .password-toggle {
                right: 0.75rem;
                font-size: 0.875rem;
            }
        }

        /* Dark mode support */
        @media (prefers-color-scheme: dark) {
            :root {
                --white: #0f172a;
                --light: #1e293b;
                --gray-100: #334155;
                --gray-200: #475569;
                --gray-300: #64748b;
                --gray-900: #f1f5f9;
                --gray-800: #e2e8f0;
                --gray-700: #cbd5e1;
                --gray-600: #94a3b8;
            }
        }

        /* Accessibility improvements */
        @media (prefers-reduced-motion: reduce) {
            * {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
            }
        }

        /* Focus visible for better keyboard navigation */
        .login-button:focus-visible,
        .social-btn:focus-visible,
        .form-input:focus-visible {
            outline: 2px solid var(--highlight);
            outline-offset: 2px;
        }