:root {
            --primary: #6366f1;
            --primary-light: #818cf8;
            --primary-dark: #4f46e5;
            --success: #10b981;
            --success-light: #34d399;
            --warning: #f59e0b;
            --warning-light: #fbbf24;
            --danger: #ef4444;
            --danger-light: #f87171;
            --info: #3b82f6;
            --purple: #8b5cf6;
            --pink: #ec4899;
            --cyan: #06b6d4;
            
            --bg-dark: #0f0f1a;
            --bg-card: #1a1a2e;
            --bg-card-hover: #252542;
            --bg-input: #1e1e32;
            
            --text-main: #ffffff;
            --text-secondary: #94a3b8;
            --text-muted: #64748b;
            
            --border: rgba(255, 255, 255, 0.08);
            --border-light: rgba(255, 255, 255, 0.15);
            --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', system-ui, sans-serif;
        }

        body {
            background: var(--bg-dark);
            color: var(--text-main);
            min-height: 100vh;
            display: flex;
            overflow: hidden;
        }

        /* Animated Background */
        .bg-animation {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            overflow: hidden;
        }

        .bg-gradient {
            position: absolute;
            width: 600px;
            height: 600px;
            border-radius: 50%;
            filter: blur(120px);
            opacity: 0.15;
            animation: float 20s ease-in-out infinite;
        }

        .bg-gradient-1 {
            background: var(--primary);
            top: -200px;
            right: -200px;
            animation-delay: 0s;
        }

        .bg-gradient-2 {
            background: var(--purple);
            bottom: -200px;
            left: -200px;
            animation-delay: -5s;
        }

        .bg-gradient-3 {
            background: var(--cyan);
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            animation-delay: -10s;
        }

        @keyframes float {
            0%, 100% { transform: translate(0, 0) scale(1); }
            25% { transform: translate(50px, -50px) scale(1.1); }
            50% { transform: translate(-30px, 30px) scale(0.95); }
            75% { transform: translate(40px, 40px) scale(1.05); }
        }

        /* Left Side - Branding */
        .auth-left {
            width: 50%;
            display: flex;
            flex-direction: column;
            justify-content: center;
            padding: 60px;
            position: relative;
        }

        .auth-branding {
            max-width: 500px;
        }

        .auth-logo {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-bottom: 40px;
        }

        .auth-logo-icon {
            width: 56px;
            height: 56px;
            background: linear-gradient(135deg, var(--primary), var(--purple));
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
        }

        .auth-logo-text {
            font-size: 28px;
            font-weight: 800;
        }

        .auth-logo-text span {
            background: linear-gradient(135deg, var(--primary-light), var(--purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .auth-title {
            font-size: 48px;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 24px;
            background: linear-gradient(135deg, var(--text-main), var(--text-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .auth-description {
            font-size: 16px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 40px;
        }

        .auth-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .auth-feature {
            display: flex;
            align-items: flex-start;
            gap: 12px;
        }

        .auth-feature-icon {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: rgba(99, 102, 241, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 16px;
            flex-shrink: 0;
        }

        .auth-feature-text h4 {
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 4px;
        }

        .auth-feature-text p {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* Right Side - Form */
        .auth-right {
            width: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 60px;
            background: rgba(26, 26, 46, 0.5);
            backdrop-filter: blur(20px);
            border-left: 1px solid var(--border);
        }

        .auth-form-container {
            width: 100%;
            max-width: 420px;
        }

        .auth-form-header {
            margin-bottom: 32px;
        }

        .auth-form-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .auth-form-subtitle {
            font-size: 14px;
            color: var(--text-muted);
        }

        .auth-form-subtitle a {
            color: var(--primary);
            text-decoration: none;
            font-weight: 500;
        }

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

        /* Form Styles */
        .form-group {
            margin-bottom: 20px;
        }

        .form-label {
            display: block;
            font-size: 13px;
            font-weight: 500;
            margin-bottom: 8px;
            color: var(--text-secondary);
        }

        .form-input-wrapper {
            position: relative;
        }

        .form-input-icon {
            position: absolute;
            left: 16px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
            font-size: 16px;
            transition: color 0.3s ease;
        }

        .form-input {
            width: 100%;
            background: var(--bg-input);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 14px 16px 14px 48px;
            color: var(--text-main);
            font-size: 14px;
            outline: none;
            transition: all 0.3s ease;
        }

        .form-input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
        }

        .form-input:focus + .form-input-icon {
            color: var(--primary);
        }

        .form-input.error {
            border-color: var(--danger);
        }

        .form-input.error:focus {
            box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
        }

        .form-error {
            font-size: 12px;
            color: var(--danger);
            margin-top: 6px;
            display: none;
        }

        .form-error.visible {
            display: block;
        }

        .form-options {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 24px;
        }

        .checkbox-wrapper {
            display: flex;
            align-items: center;
            gap: 8px;
            cursor: pointer;
        }

        .checkbox-wrapper input {
            width: 18px;
            height: 18px;
            accent-color: var(--primary);
            cursor: pointer;
        }

        .checkbox-wrapper label {
            font-size: 13px;
            color: var(--text-secondary);
            cursor: pointer;
        }

        .forgot-password {
            font-size: 13px;
            color: var(--primary);
            text-decoration: none;
            font-weight: 500;
        }

        .forgot-password:hover {
            text-decoration: underline;
        }

        .form-submit {
            width: 100%;
            padding: 16px;
            border-radius: 12px;
            border: none;
            background: linear-gradient(135deg, var(--primary), var(--purple));
            color: white;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            margin-bottom: 24px;
        }

        .form-submit:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 24px rgba(99, 102, 241, 0.4);
        }

        .form-submit:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none;
        }

        .form-submit .spinner {
            width: 20px;
            height: 20px;
            border: 2px solid rgba(255, 255, 255, 0.3);
            border-top-color: white;
            border-radius: 50%;
            animation: spin 0.8s linear infinite;
            display: none;
        }

        .form-submit.loading .spinner {
            display: block;
        }

        .form-submit.loading .btn-text {
            display: none;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        /* Divider */
        .form-divider {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-bottom: 24px;
            color: var(--text-muted);
            font-size: 13px;
        }

        .form-divider::before,
        .form-divider::after {
            content: '';
            flex: 1;
            height: 1px;
            background: var(--border);
        }

        /* Social Login */
        .social-login {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
            margin-bottom: 24px;
        }

        .social-btn {
            padding: 14px;
            border-radius: 12px;
            border: 1px solid var(--border);
            background: var(--bg-card);
            color: var(--text-main);
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }

        .social-btn:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-light);
            transform: translateY(-2px);
        }

        .social-btn i {
            font-size: 18px;
        }

        .social-btn.google i {
            background: linear-gradient(135deg, #4285f4, #34a853, #fbbc05, #ea4335);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .social-btn.github i {
            color: var(--text-main);
        }

        /* Role Selector (for demo) */
        .role-selector {
            margin-top: 32px;
            padding-top: 32px;
            border-top: 1px solid var(--border);
        }

        .role-selector-title {
            font-size: 12px;
            color: var(--text-muted);
            margin-bottom: 16px;
            text-align: center;
        }

        .role-options {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 10px;
        }

        .role-option {
            padding: 12px;
            border-radius: 10px;
            border: 1px solid var(--border);
            background: var(--bg-card);
            color: var(--text-secondary);
            font-size: 12px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
            text-align: center;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 8px;
        }

        .role-option i {
            font-size: 20px;
        }

        .role-option:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-light);
            color: var(--text-main);
        }

        .role-option.active {
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(139, 92, 246, 0.1));
            border-color: var(--primary);
            color: var(--primary);
        }

        /* Toast Notifications */
        .toast-container {
            position: fixed;
            top: 20px;
            right: 20px;
            z-index: 1000;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .toast {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 16px 20px;
            display: flex;
            align-items: center;
            gap: 12px;
            min-width: 320px;
            box-shadow: var(--shadow);
            transform: translateX(100%);
            opacity: 0;
            transition: all 0.3s ease;
        }

        .toast.show {
            transform: translateX(0);
            opacity: 1;
        }

        .toast-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
        }

        .toast-icon.success { background: rgba(16, 185, 129, 0.15); color: var(--success); }
        .toast-icon.error { background: rgba(239, 68, 68, 0.15); color: var(--danger); }
        .toast-icon.info { background: rgba(59, 130, 246, 0.15); color: var(--info); }

        .toast-content { flex: 1; }
        .toast-title { font-size: 14px; font-weight: 600; margin-bottom: 3px; }
        .toast-message { font-size: 12px; color: var(--text-muted); }

        .toast-close {
            width: 28px;
            height: 28px;
            border-radius: 8px;
            border: 1px solid var(--border);
            background: transparent;
            color: var(--text-muted);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
        }

        .toast-close:hover {
            background: var(--bg-card-hover);
            color: var(--text-main);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .auth-left {
                display: none;
            }
            .auth-right {
                width: 100%;
            }
        }

        @media (max-width: 480px) {
            .auth-right {
                padding: 30px 20px;
            }
            .social-login {
                grid-template-columns: 1fr;
            }
            .role-options {
                grid-template-columns: repeat(2, 1fr);
            }
        }