/* 기본 리셋 및 변수 */
:root {
    --primary-color: #4A90D9;
    --primary-hover: #357ABD;
    --success-color: #28a745;
    --error-color: #dc3545;
    --text-color: #333;
    --text-light: #666;
    --border-color: #ddd;
    --background-color: #f8f9fa;
    --white: #fff;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

/* 컨테이너 */
.container {
    max-width: 480px;
    margin: 0 auto;
    padding: 40px 20px;
    min-height: 100vh;
}

/* 헤더 */
.header {
    text-align: center;
    margin-bottom: 40px;
}

.header h1 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-color);
}

.subtitle {
    font-size: 16px;
    color: var(--text-light);
}

/* 폼 섹션 */
.form-section {
    background: var(--white);
    border-radius: 12px;
    padding: 32px 24px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

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

/* 폼 그룹 */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-color);
}

.required {
    color: var(--error-color);
}

.form-group input[type="text"],
.form-group input[type="tel"],
.form-group input[type="email"] {
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.1);
}

.form-group input::placeholder {
    color: #aaa;
}

/* 체크박스 */
.checkbox-group {
    margin-top: 8px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    cursor: pointer;
    font-weight: 400;
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-top: 2px;
    cursor: pointer;
}

.checkbox-label span {
    font-size: 14px;
    color: var(--text-light);
}

/* 제출 버튼 */
.submit-btn {
    margin-top: 12px;
    padding: 16px 24px;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

.submit-btn:hover {
    background-color: var(--primary-hover);
}

.submit-btn:active {
    transform: scale(0.98);
}

.submit-btn:disabled {
    background-color: #aaa;
    cursor: not-allowed;
    transform: none;
}

[hidden] {
    display: none !important;
}

.btn-loading {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-loading::after {
    content: '';
    width: 16px;
    height: 16px;
    border: 2px solid var(--white);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* 폼 메시지 */
.form-message {
    margin-top: 20px;
    padding: 16px;
    border-radius: 8px;
    text-align: center;
    font-size: 15px;
}

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

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

/* 반응형 */
@media (max-width: 480px) {
    .container {
        padding: 24px 16px;
    }

    .header h1 {
        font-size: 24px;
    }

    .form-section {
        padding: 24px 20px;
    }
}