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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: #f5f5f5;
    color: #333333;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

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

.logo-link {
    display: inline-block;
    text-decoration: none;
}

.logo {
    max-width: 200px;
    height: auto;
}

main {
    background-color: #ffffff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 500;
    color: #333333;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"] {
    padding: 12px;
    background-color: #ececec;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    color: #888888;
    font-family: inherit;
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group input[type="tel"]:focus {
    outline: none;
    border-color: #333333;
    background-color: #ffffff;
}

.checkbox-group {
    margin: 10px 0;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    cursor: pointer;
    font-weight: normal;
}

.checkbox-label input[type="checkbox"] {
    margin-top: 4px;
    cursor: pointer;
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.checkbox-label span {
    font-size: 14px;
    line-height: 1.5;
}

.submit-btn {
    padding: 14px 30px;
    background-color: #333333;
    color: #ececec;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s;
    margin-top: 10px;
}

.submit-btn:hover {
    background-color: #555555;
}

.submit-btn:active {
    background-color: #222222;
}

.submit-btn:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

.message {
    padding: 12px;
    border-radius: 4px;
    text-align: center;
    font-weight: 500;
    display: none;
}

.message.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    display: block;
}

.message.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    display: block;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    header {
        margin-bottom: 30px;
    }

    .logo {
        max-width: 150px;
    }

    main {
        padding: 20px;
    }

    .form-group input[type="text"],
    .form-group input[type="email"],
    .form-group input[type="tel"] {
        font-size: 16px; /* Prevents zoom on iOS */
    }

    .checkbox-label span {
        font-size: 13px;
    }

    .submit-btn {
        width: 100%;
        padding: 16px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }

    main {
        padding: 15px;
    }

    .logo {
        max-width: 120px;
    }
}