:root {
            --primary-black: #1a1a1a;
            --accent-yellow: #ffc107;
            --text-dark: #333333;
            --bg-light: #f5f5f5;
            --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
        }

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

        body {
            font-family: var(--font-family);
            color: var(--text-dark);
            background: var(--bg-light);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        main {
            flex: 1;
        }

        .login-container {
            width: 95%;
            max-width: 600px;
            margin: 20px auto;
            padding: 40px;
            background: white;
            border-radius: 8px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
        }

        .login-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .login-header h1 {
            font-size: 32px;
            color: #1a1a1a;
            margin-bottom: 10px;
            text-transform: uppercase;
        }

        .login-header img {
            height: 60px;
            margin-top: 20px;
        }

        .login-form {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #333;
        }

        .form-group input {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 14px;
            font-family: inherit;
        }

        .btn-submit {
            background: #1a1a1a;
            color: white;
            padding: 12px 30px;
            border: none;
            border-radius: 4px;
            font-weight: 600;
            font-size: 14px;
            cursor: pointer;
            transition: 0.3s;
        }

        .preview-link {
            margin-top: 18px;
            text-align: center;
        }

        .preview-link a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
            color: #1a1a1a;
            background: rgba(255, 193, 7, 0.2);
            border: 1px solid rgba(255, 193, 7, 0.55);
            border-radius: 6px;
            padding: 10px 14px;
            font-size: 13px;
            font-weight: 700;
            transition: 0.2s;
        }

        .preview-link a:hover {
            background: rgba(255, 193, 7, 0.33);
        }

        .error-message {
            color: red;
            text-align: center;
            margin-top: 20px;
        }