:root {
            --primary: #6366f1;
            --primary-light: #818cf8;
            --primary-dark: #4f46e5;
            --accent: #8b5cf6;
            --success: #10b981;
            --danger: #ef4444;
            --warning: #f59e0b;
            --info: #3b82f6;
            --bg-primary: #ffffff;
            --bg-secondary: #f8fafc;
            --bg-tertiary: #f1f5f9;
            --text-primary: #1e293b;
            --text-secondary: #64748b;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            --radius: 8px;
            --radius-sm: 6px;
            --radius-lg: 12px;
        }

        * {
            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-secondary);
            color: var(--text-primary);
            font-size: 14px;
            line-height: 1.5;
            -webkit-font-smoothing: antialiased;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
        }

        .login-wrapper {
            position: relative;
            width: 100%;
            max-width: 420px;
        }

        .login-container {
            background: var(--bg-primary);
            padding: 40px;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            width: 100%;
            position: relative;
            overflow: hidden;
        }

        .login-container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
        }

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

        .login-logo {
            display: block;
            height: 48px;
            width: auto;
            margin: 0 auto;
        }

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

        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: var(--text-primary);
            font-weight: 500;
            font-size: 14px;
        }

        .form-group input {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            font-size: 14px;
            font-family: inherit;
            background: var(--bg-primary);
            color: var(--text-primary);
            transition: all 0.2s;
        }

        .form-group input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
        }

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

        .checkbox-group {
            display: flex;
            align-items: center;
            margin-bottom: 24px;
        }

        .checkbox-group input[type="checkbox"] {
            width: 18px;
            height: 18px;
            margin-right: 8px;
            cursor: pointer;
            accent-color: var(--primary);
        }

        .checkbox-group label {
            margin: 0;
            font-weight: 400;
            cursor: pointer;
            color: var(--text-secondary);
        }

        .btn {
            width: 100%;
            padding: 12px 24px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: white;
            border: none;
            border-radius: var(--radius);
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s;
            font-family: inherit;
            box-shadow: var(--shadow);
        }

        .btn:hover {
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

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

        .error {
            color: var(--danger);
            margin-top: 6px;
            font-size: 13px;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .error::before {
            content: '⚠';
            font-size: 16px;
        }

        @media (max-width: 480px) {
            .login-container {
                padding: 32px 24px;
            }

            .login-logo {
                height: 40px;
            }
        }