:root {
            --primary: #4ecdc4;
            --primary-dark: #3dbdb5;
            --primary-light: #6ed7d0;
            --primary-bg: rgba(78, 205, 196, 0.08);
            --primary-bg-hover: rgba(78, 205, 196, 0.12);
            --danger: #ef4444;
            --danger-bg: rgba(239, 68, 68, 0.08);
            --bg-main: #f8fafc;
            --bg-card: #ffffff;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --border-color: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --radius-xl: 16px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05), 0 2px 4px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.06), 0 4px 6px rgba(0, 0, 0, 0.04);
            --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.08), 0 10px 10px rgba(0, 0, 0, 0.04);
            --transition: 0.2s ease;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: var(--bg-main);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 24px;
        }

        .login-wrapper {
            display: flex;
            width: 100%;
            max-width: 960px;
            background: var(--bg-card);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-xl);
            overflow: hidden;
            border: 1px solid var(--border-light);
        }

        .login-left {
            flex: 1;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            padding: 48px 40px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }

        .login-left::before {
            content: '';
            position: absolute;
            top: -60%;
            right: -40%;
            width: 120%;
            height: 120%;
            background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 60%);
            border-radius: 50%;
        }

        .login-left::after {
            content: '';
            position: absolute;
            bottom: -40%;
            left: -40%;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 50%);
            border-radius: 50%;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 40px;
            position: relative;
            z-index: 1;
        }

        .brand-icon {
            width: 48px;
            height: 48px;
            background: rgba(255, 255, 255, 0.15);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            backdrop-filter: blur(10px);
        }

        .brand-icon svg {
            width: 26px;
            height: 26px;
            fill: #fff;
        }

        .brand-text {
            display: flex;
            flex-direction: column;
        }

        .brand-name {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            letter-spacing: -0.3px;
        }

        .brand-tag {
            font-size: 12px;
            color: rgba(255, 255, 255, 0.75);
        }

        .login-left-content {
            position: relative;
            z-index: 1;
        }

        .login-left h2 {
            font-size: 26px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }

        .login-left p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.7;
        }

        .features {
            margin-top: 40px;
            display: flex;
            flex-direction: column;
            gap: 16px;
            position: relative;
            z-index: 1;
        }

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

        .feature-icon {
            width: 36px;
            height: 36px;
            background: rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .feature-icon svg {
            width: 18px;
            height: 18px;
            fill: #fff;
        }

        .feature-text {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.95);
            font-weight: 500;
        }

        .login-right {
            flex: 1;
            padding: 48px 40px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .login-header {
            margin-bottom: 32px;
        }

        .login-title {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 6px;
            letter-spacing: -0.5px;
        }

        .login-subtitle {
            font-size: 13px;
            color: var(--text-muted);
        }

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

        .form-label {
            display: block;
            font-size: 13px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .form-input {
            width: 100%;
            height: 46px;
            padding: 0 16px;
            background: var(--bg-main);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            font-size: 14px;
            color: var(--text-primary);
            outline: none;
            transition: var(--transition);
            font-family: inherit;
        }

        .form-input:focus {
            border-color: var(--primary);
            background: var(--bg-card);
            box-shadow: 0 0 0 3px var(--primary-bg);
        }

        .form-input::placeholder {
            color: var(--text-muted);
        }

        .submit-btn {
            width: 100%;
            padding: 12px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            border: none;
            border-radius: var(--radius-md);
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 2px 8px rgba(78, 205, 196, 0.3);
            margin-top: 8px;
            letter-spacing: 0.3px;
        }

        .submit-btn:hover {
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(78, 205, 196, 0.4);
        }

        .submit-btn:active {
            transform: translateY(0);
        }

        .alert {
            padding: 12px 16px;
            border-radius: var(--radius-md);
            margin-bottom: 20px;
            font-size: 13px;
            display: flex;
            align-items: center;
            gap: 10px;
            background: var(--danger-bg);
            color: var(--danger);
            border: 1px solid rgba(239, 68, 68, 0.12);
        }

        .alert svg {
            width: 18px;
            height: 18px;
            fill: currentColor;
            flex-shrink: 0;
        }

        .login-footer {
            margin-top: 32px;
            padding-top: 24px;
            border-top: 1px solid var(--border-light);
            text-align: center;
        }

        .footer-text {
            font-size: 12px;
            color: var(--text-muted);
            margin-bottom: 12px;
        }

        .credentials {
            display: flex;
            justify-content: center;
            gap: 20px;
            font-size: 12px;
        }

        .cred-item {
            display: flex;
            align-items: center;
            gap: 6px;
            color: var(--text-secondary);
        }

        .cred-label {
            color: var(--text-muted);
        }

        .cred-value {
            color: var(--primary);
            font-weight: 600;
            font-family: 'Monaco', 'Consolas', monospace;
            font-size: 11px;
        }

        @media (max-width: 860px) {
            .login-wrapper {
                max-width: 480px;
            }
            .login-left {
                display: none;
            }
            .login-right {
                padding: 40px 32px;
            }
        }

        @media (max-width: 480px) {
            .login-wrapper {
                max-width: 100%;
                border-radius: var(--radius-lg);
            }
            .login-right {
                padding: 32px 24px;
            }
            .login-title {
                font-size: 22px;
            }
            .credentials {
                flex-direction: column;
                gap: 8px;
            }
        }