:root {
            --bg: #f4f7fb;
            --card: #ffffff;
            --text: #1f2937;
            --muted: #6b7280;
            --primary: #1d4ed8;
            --primary-dark: #1e40af;
            --border: #dbe3ef;
            --danger: #b91c1c;
            --success: #166534;
        }

        * { box-sizing: border-box; }

        body {
            margin: 0;
            min-height: 100vh;
            font-family: Arial, Helvetica, sans-serif;
            background: linear-gradient(135deg, #eef4ff 0%, #f8fbff 45%, #eef2f7 100%);
            color: var(--text);
            display: grid;
            place-items: center;
            padding: 20px;
        }

        .login-shell {
            width: 100%;
            max-width: 1000px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            background: var(--card);
            border-radius: 22px;
            overflow: hidden;
            box-shadow: 0 20px 50px rgba(15, 23, 42, 0.12);
        }

        .blog-info {
            padding: 48px;
            background: linear-gradient(160deg, #0f172a, #1e3a8a 60%, #2563eb);
            color: white;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .blog-info h1 {
            font-size: 2.2rem;
            margin: 0 0 14px;
        }

        .blog-info p {
            font-size: 1rem;
            line-height: 1.7;
            opacity: 0.95;
            margin-bottom: 24px;
        }

        .blog-info ul {
            margin: 0 0 28px;
            padding-left: 20px;
            line-height: 1.8;
        }

        .blog-btn {
            display: inline-block;
            width: fit-content;
            padding: 13px 20px;
            border-radius: 12px;
            background: #ffffff;
            color: var(--primary);
            font-size: 1rem;
            font-weight: 700;
            text-decoration: none;
            transition: 0.2s ease;
        }

        .blog-btn:hover {
            background: #dbeafe;
        }

        .login-card {
            padding: 42px;
        }

        .login-card h2 {
            margin-top: 0;
            margin-bottom: 10px;
            font-size: 1.8rem;
        }

        .login-card p {
            color: var(--muted);
            margin-bottom: 24px;
        }

        .messages {
            display: grid;
            gap: 10px;
            margin-bottom: 18px;
        }

        .message {
            padding: 12px 14px;
            border-radius: 10px;
            font-size: 0.95rem;
        }

        .message.error {
            background: #fef2f2;
            color: var(--danger);
            border: 1px solid #fecaca;
        }

        .message.success {
            background: #f0fdf4;
            color: var(--success);
            border: 1px solid #bbf7d0;
        }

        form {
            display: grid;
            gap: 16px;
        }

        label {
            display: block;
            font-weight: 600;
            margin-bottom: 8px;
        }

        input {
            width: 100%;
            padding: 12px 14px;
            border-radius: 10px;
            border: 1px solid var(--border);
            font-size: 1rem;
        }

        input:focus {
            outline: none;
            border-color: #93c5fd;
            box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.12);
        }

        .errorlist {
            color: var(--danger);
            margin: 8px 0 0;
            padding-left: 18px;
            font-size: 0.92rem;
        }

        button {
            border: 0;
            border-radius: 12px;
            background: var(--primary);
            color: white;
            font-size: 1rem;
            font-weight: 600;
            padding: 13px 18px;
            cursor: pointer;
        }

        button:hover {
            background: var(--primary-dark);
        }

        @media (max-width: 800px) {
            .login-shell {
                grid-template-columns: 1fr;
            }

            .blog-info,
            .login-card {
                padding: 28px;
            }
        }