/* Modern Design Tokens */
        :root {
            --primary-color: #4f46e5;
            --primary-hover: #4338ca;
            --bg-color: #f3f4f6;
            --card-bg: #ffffff;
            --text-main: #1f2937;
            --text-muted: #4b5563;
            --border-color: #d1d5db;
            --success-bg: #ecfdf5;
            --success-text: #065f46;
            --success-border: #a7f3d0;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-main);
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            padding: 1.25rem;
        }

        /* Centered Form Card */
        .card {
            background: var(--card-bg);
            padding: 2.5rem 2rem;
            border-radius: 12px;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            width: 100%;
            max-width: 400px;
        }

        h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            color: #111827;
            text-align: center;
        }

        /* Clean Alert Box Styling */
        .alert {
            padding: 1rem;
            border-radius: 8px;
            margin-bottom: 1.5rem;
            font-size: 0.875rem;
            line-height: 1.4;
            background-color: var(--success-bg);
            color: var(--success-text);
            border: 1px solid var(--success-border);
        }

        .form-group {
            margin-bottom: 1.5rem;
        }

        label {
            display: block;
            font-size: 0.875rem;
            font-weight: 500;
            margin-bottom: 0.5rem;
            color: var(--text-muted);
        }

        input[type="email"] {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 1rem;
            color: var(--text-main);
            transition: border-color 0.2s, box-shadow 0.2s;
        }

        /* Focus Ring Effect */
        input[type="email"]:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
        }

        /* Interactive Action Button */
        button {
            width: 100%;
            padding: 0.75rem;
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: 6px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background-color 0.2s;
        }

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