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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    background-color: #ffffff;
    color: #333;
    line-height: 1.6;
}

header {
    padding: 20px 24px;
    border-bottom: 1px solid #e0e0e0;
    background-color: #ffffff;
}

.logo {
    font-size: 24px;
    font-weight: 300;
    letter-spacing: 4px;
    color: #333;
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

.container {
    max-width: 480px;
    margin: 0 auto;
    padding: 32px 24px;
}

h1 {
    font-size: 28px;
    font-weight: 600;
    color: #333;
    margin-bottom: 16px;
}

.subtitle {
    font-size: 14px;
    color: #666;
    margin-bottom: 32px;
    line-height: 1.5;
}

form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

input[type="text"],
input[type="email"],
input[type="tel"],
select {
    width: 100%;
    padding: 16px;
    font-size: 15px;
    border: none;
    background-color: #f5f5f5;
    border-radius: 4px;
    color: #666;
    font-family: inherit;
    transition: background-color 0.2s;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
select:focus {
    outline: none;
    background-color: #ebebeb;
}

input::placeholder {
    color: #999;
}

.select-wrapper {
    position: relative;
}

.select-wrapper::after {
    content: '▼';
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: #666;
    font-size: 12px;
}

select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    cursor: pointer;
    padding-right: 40px;
}

select option {
    background-color: #ffffff;
    color: #333;
}

.checkbox-group {
    margin: 8px 0;
    position: relative;
}

.checkbox-container {
    display: flex;
    align-items: flex-start;
    cursor: pointer;
    position: relative;
    padding-left: 36px;
    user-select: none;
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: absolute;
    left: 0;
    top: 2px;
    height: 20px;
    width: 20px;
    background-color: #f5f5f5;
    border: 1px solid #ddd;
    border-radius: 3px;
    flex-shrink: 0;
}

.checkbox-container:hover input ~ .checkmark {
    background-color: #ebebeb;
}

.checkbox-container input:checked ~ .checkmark {
    background-color: #333;
    border-color: #333;
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.checkbox-container input:checked ~ .checkmark:after {
    display: block;
}

.checkbox-container .checkmark:after {
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.checkbox-text {
    font-size: 12px;
    color: #666;
    line-height: 1.5;
}

.submit-btn {
    width: 100%;
    padding: 18px;
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 1px;
    color: #ffffff;
    background: linear-gradient(135deg, #ff6b6b 0%, #ff5252 100%);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin-top: 16px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.submit-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 82, 82, 0.3);
}

.submit-btn:active {
    transform: translateY(0);
}

.error-message {
    color: #ff5252;
    font-size: 12px;
    margin-top: 8px;
    margin-bottom: 8px;
    font-weight: 500;
    background-color: #ffebee;
    padding: 8px 12px;
    border-radius: 4px;
    border-left: 3px solid #ff5252;
}

.checkbox-group .error-message {
    margin-top: 8px;
    margin-left: 0;
    padding-left: 36px;
    display: block;
    font-weight: 500;
    background-color: #ffebee;
    padding: 10px 10px 10px 36px;
    border-radius: 4px;
    border-left: 3px solid #ff5252;
}

.success-message {
    background-color: #4caf50;
    color: white;
    padding: 16px;
    border-radius: 4px;
    text-align: center;
    margin-bottom: 16px;
}

@media (max-width: 600px) {
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 24px 16px;
    }
    
    h1 {
        font-size: 24px;
    }
}