/* CSS 변수 정의 */
:root {
    /* 색상 */
    --color-primary: #0066FF;
    --color-primary-dark: #0052cc;
    --color-background: #FFFFFF;
    --color-background-alt: #F5F5F5;
    --color-text: #191919;
    --color-text-light: #FFFFFF;
    --color-border: #EDEEF0;
    
    /* 여백 - 반응형 값으로 변경 */
    --spacing-xs: clamp(8px, 1vw + 4px, 12px);
    --spacing-sm: clamp(12px, 1vw + 8px, 16px);
    --spacing-md: clamp(16px, 1.5vw + 10px, 20px);
    --spacing-lg: clamp(24px, 2vw + 16px, 40px);
    
    /* 폰트 크기 - 반응형 값으로 변경 */
    --font-size-xs: clamp(0.75rem, 0.5vw + 0.5rem, 0.875rem);
    --font-size-sm: clamp(0.875rem, 0.75vw + 0.625rem, 1rem);
    --font-size-md: clamp(1rem, 1vw + 0.75rem, 1.25rem);
    --font-size-lg: clamp(1.25rem, 1.5vw + 0.875rem, 1.5rem);
}

/* 기본 스타일 및 리셋 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Pretendard', sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background-alt);
}

/* 이미지 최적화 */
img {
    max-width: 100%;
    height: auto;
    display: block;
    aspect-ratio: attr(width) / attr(height);
}

/* 헤더 스타일 */
header {
    background-color: var(--color-primary);
    padding: var(--spacing-xs) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    max-width: min(100%, 1200px);
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0 var(--spacing-md);
}

.logo img {
    max-width: 90px;
    height: auto;
}

/* 메인 컨텐츠 스타일 */
.main-content {
    display: flex;
    justify-content: center;
    padding: var(--spacing-md);
}

.form-container {
    background-color: var(--color-background);
    border-radius: var(--spacing-md);
    box-shadow: 0px 22px 41px 5px rgba(21, 21, 21, 0.26);
    padding: var(--spacing-lg) var(--spacing-sm);
    width: 100%;
    max-width: min(100%, 500px);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* 타이틀 섹션 */
.title-section {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.title-section h1 {
    font-weight: 700;
    font-size: var(--font-size-lg);
    line-height: 1.1;
    color: var(--color-text);
}

.title-section p {
    font-weight: 500;
    font-size: var(--font-size-sm);
    line-height: 1.57;
    color: rgba(92, 92, 92, 0.8);
}

/* 설정 폼 */
.setup-form {
    background-color: var(--color-background);
    border-radius: var(--spacing-md);
    padding: var(--spacing-lg) var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.form-group label {
    font-weight: 600;
    font-size: var(--font-size-md);
    line-height: 1.375;
    color: var(--color-text);
}

/* 언어 선택 버튼 */
.language-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr));
    gap: var(--spacing-sm);
    width: 100%;
}

.lang-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    padding: 12px 15px;
    border-radius: 12px;
    border: 1px solid rgba(0, 102, 255, 0.34);
    background-color: #FFFFFF;
    cursor: pointer;
    font-weight: 500;
    font-size: 16px;
    transition: all 0.3s ease;
}

.lang-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.lang-btn.active {
    background-color: #0066FF;
    color: #FFFFFF;
}

.lang-icon {
    font-weight: 600;
    font-size: 24px;
    margin-bottom: 5px;
}

.lang-text {
    font-weight: 500;
}

/* 난이도 선택 버튼 */
.level-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr));
    gap: var(--spacing-md);
    width: 100%;
}

.level-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 34px 20px;
    border-radius: 12px;
    border: 1px solid rgba(0, 102, 255, 0.34);
    background-color: #FFFFFF;
    cursor: pointer;
    font-weight: 600;
    font-size: 16px;
    color: #191919;
    transition: all 0.3s ease;
}

.level-btn.active {
    background-color: #0066FF;
    color: #FFFFFF;
}

/* 주제 선택 */
.select-container {
    width: 100%;
}

.topic-select {
    width: 100%;
    padding: 15px 10px;
    border-radius: 12px;
    border: 1px solid rgba(0, 102, 255, 0.4);
    font-family: 'Pretendard', sans-serif;
    font-weight: 500;
    font-size: 16px;
    color: #191919;
    appearance: none;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="%23000000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M6 9l6 6 6-6"/></svg>');
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 16px;
}

/* 휴대폰 입력 */
.input-container {
    width: 100%;
}

input[type="tel"] {
    width: 100%;
    padding: 15px 10px;
    border-radius: 12px;
    border: 1px solid rgba(0, 102, 255, 0.4);
    font-family: 'Pretendard', sans-serif;
    font-weight: 500;
    font-size: 16px;
    color: #191919;
}

input[type="tel"]::placeholder {
    color: #9A9A9A;
}

/* 제출 버튼 */
.submit-btn {
    background-color: #0066FF;
    color: #FFFFFF;
    font-weight: 600;
    font-size: 16px;
    padding: 11px 0;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    box-shadow: 0px 4px 4px 0px rgba(0, 0, 0, 0.25);
    transition: background-color 0.3s ease;
}

.lang-btn:hover, .level-btn:hover {
    background-color: rgba(0, 102, 255, 0.1);
    cursor: pointer;
}

.submit-btn:hover {
    background-color: #0055d4;
    cursor: pointer;
}

/* 안내 텍스트 */
.info-text {
    font-weight: 500;
    font-size: 16px;
    line-height: 1.375;
    color: rgba(92, 92, 92, 0.8);
    text-align: center;
}

/* 푸터 스타일 */
footer {
    background-color: var(--color-primary);
    color: var(--color-text-light);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.footer-logo {
    margin-bottom: 1rem;
}

.footer-logo img {
    height: 40px;
}

.footer-company,
.footer-registration,
.footer-links,
.footer-hosting,
.footer-copyright {
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-links {
    display: flex;
    gap: 1rem;
}

.footer-links a {
    color: var(--color-text-light);
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.footer-links a:hover {
    opacity: 1;
}

@media (max-width: 768px) {
    .footer-content {
        padding: 0 1rem;
    }
    
    .footer-logo img {
        height: 30px;
    }
    
    .footer-company,
    .footer-registration,
    .footer-links,
    .footer-hosting,
    .footer-copyright {
        font-size: 0.8rem;
    }
}

/* 반응형 스타일 (모바일 우선) */
@media (min-width: 359px) {
    .form-container {
        padding: var(--spacing-lg);
    }
    
    .language-options {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .level-options {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 768px) {
    .form-container {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .title-section h1 {
        font-size: var(--font-size-lg);
    }
    
    .title-section p {
        font-size: var(--font-size-md);
    }
}

@media (min-width: 1024px) {
    .form-container {
        padding: var(--spacing-lg) var(--spacing-lg);
    }
}