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

/* Variables */
:root {
    --primary-color: #0056b3;
    --secondary-color: #f8f9fa;
    --success-color: #28a745;
    --error-color: #dc3545;
    --text-color: #333;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f2f5;
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 100%;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.unsubscribe-card {
    background-color: white;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    width: 100%;
    max-width: 500px;
    padding: 30px;
    text-align: center;
    transition: var(--transition);
}

.logo {
    margin-bottom: 20px;
}

.logo img {
    max-width: 150px;
    height: auto;
}

h1 {
    font-size: 24px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

p {
    margin-bottom: 20px;
    color: #666;
}

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

input[type="email"] {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    transition: var(--transition);
}

input[type="email"]:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 2px rgba(0, 86, 179, 0.25);
}

.btn-unsubscribe {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 12px 24px;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
}

.btn-unsubscribe:hover {
    background-color: #004494;
}

.btn-return {
    display: inline-block;
    margin-top: 20px;
    padding: 10px 20px;
    background-color: #6c757d;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    transition: var(--transition);
}

.btn-return:hover {
    background-color: #5a6268;
}

.success-message {
    color: var(--success-color);
    padding: 20px 0;
}

.error-message {
    color: var(--error-color);
    padding: 20px 0;
}

.icon-success, .icon-error {
    margin: 20px 0;
}

.icon-success svg {
    stroke: var(--success-color);
}

.icon-error svg {
    stroke: var(--error-color);
}

.footer {
    margin-top: 30px;
    font-size: 14px;
    color: #999;
}

/* Responsive styles */
@media (max-width: 576px) {
    .unsubscribe-card {
        padding: 20px;
    }
    
    h1 {
        font-size: 20px;
    }
    
    .btn-unsubscribe, .btn-return {
        padding: 10px 20px;
    }
}