/* css/style.css */
:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-body: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-sub: #64748b;
    --border-color: #e2e8f0;
    --accent-bg: #eff6ff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --radius: 12px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* 상단 헤더 & 네비게이션 */
.site-header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.logo {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
}

/* 햄버거 토글 버튼 (PC에서는 기본 숨김) */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-main);
    padding: 5px;
}

/* PC 메인 메뉴 링크 목록 */
.nav-links {
    display: flex;
    gap: 20px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-sub);
    font-size: 0.95rem;
    font-weight: 600;
    transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
}

/* 메인 컨테이너 */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 30px 20px;
    flex: 1;
    width: 100%;
}

/* 히어로 섹션 */
.hero {
    text-align: center;
    margin-bottom: 40px;
}

.hero h1 {
    font-size: 2.1rem;
    color: var(--text-main);
    margin-bottom: 10px;
}

.hero p {
    color: var(--text-sub);
    font-size: 1.05rem;
}

/* 도구 카드 그리드 (메인 홈 전용) */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.tool-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
    display: flex;
    flex-direction: column;
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    border-color: var(--primary);
}

.tool-card .icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.tool-card h3 {
    font-size: 1.15rem;
    color: var(--text-main);
    margin-bottom: 8px;
}

.tool-card p {
    font-size: 0.9rem;
    color: var(--text-sub);
    flex: 1;
}

/* 세부 도구 페이지 공통 카드 스타일 */
.tool-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

/* 폼 요소 & 버튼 (공통) */
.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 6px;
    color: var(--text-main);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.btn-primary {
    width: 100%;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 14px;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

/* 결과 출력 영역 공통 스타일 */
.result-box {
    display: none;
    margin-top: 25px;
    background-color: var(--accent-bg);
    border: 1px solid #bfdbfe;
    border-radius: 8px;
    padding: 20px;
}

.result-box.active {
    display: block;
}

/* 광고 영역 */
.ad-container {
    width: 100%;
    margin: 30px 0;
    background: var(--card-bg);
    border: 1px dashed var(--border-color);
    border-radius: 8px;
    text-align: center;
    padding: 20px 0;
    color: var(--text-sub);
    font-size: 0.85rem;
}

/* SEO 콘텐츠 영역 */
.seo-content {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
}

.seo-content h2 {
    font-size: 1.3rem;
    color: var(--text-main);
    margin-top: 24px;
    margin-bottom: 12px;
    border-left: 4px solid var(--primary);
    padding-left: 10px;
}

.seo-content h2:first-of-type {
    margin-top: 0;
}

.seo-content h3 {
    font-size: 1.1rem;
    color: var(--text-main);
    margin-top: 16px;
    margin-bottom: 8px;
}

.seo-content p {
    color: #334155;
    font-size: 0.95rem;
    margin-bottom: 12px;
    word-break: keep-all;
}

.seo-content ul {
    margin-left: 20px;
    margin-bottom: 12px;
    color: #334155;
    font-size: 0.95rem;
}

.seo-content li {
    margin-bottom: 6px;
}

/* 푸터 */
footer {
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    text-align: center;
    padding: 20px;
    color: var(--text-sub);
    font-size: 0.85rem;
    margin-top: auto;
}

.mobile-br {
    display: none;
}

/* --- 모바일 반응형 미디어 쿼리 (768px 이하) --- */
@media (max-width: 768px) {
    .mobile-br {
        display: block;
    }

    .menu-toggle {
        display: block;
        /* 모바일에서 햄버거 버튼 표시 */
    }

    .nav-links {
        display: none;
        /* 기본적으로 메뉴 숨김 */
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--card-bg);
        border-bottom: 1px solid var(--border-color);
        padding: 15px 20px;
        gap: 12px;
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    }

    /* JavaScript로 .active 클래스가 추가되면 모바일 메뉴가 펼쳐짐 */
    .nav-links.active {
        display: flex;
    }

    .nav-links a {
        display: block;
        padding: 8px 0;
        border-bottom: 1px solid #f1f5f9;
    }

    .nav-links li:last-child a {
        border-bottom: none;
    }

    .hero h1 {
        font-size: 1.6rem;
    }
}