/**
 * OST 스타일시트 - 태블릿PC 최적화
 * 반응형 웹 디자인 (태블릿PC 중심)
 */

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

/* 컨테이너 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 헤더 */
.header {
    background: linear-gradient(135deg, #007cba, #0056b3);
    color: white;
    padding: 20px 0;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 300;
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* 네비게이션 */
.nav {
    background: white;
    padding: 15px 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: #333;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.nav-links a:hover {
    background-color: #f0f0f0;
}

/* 상품군 선택 버튼 */
.product-groups {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.product-group-btn {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 15px;
    padding: 30px 20px;
    text-align: center;
    text-decoration: none;
    color: #333;
    transition: all 0.3s ease;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.product-group-btn:hover {
    border-color: #007cba;
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,124,186,0.2);
}

.product-group-btn h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #007cba;
}

.product-group-btn p {
    color: #666;
    font-size: 0.9rem;
}

/* 콘텐츠 목록 */
.content-list {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.content-list h2 {
    color: #007cba;
    margin-bottom: 20px;
    font-size: 1.8rem;
}

/* 검색 */
.search-box {
    margin-bottom: 30px;
}

.search-input {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 25px;
    font-size: 1.1rem;
    outline: none;
    transition: border-color 0.3s;
}

.search-input:focus {
    border-color: #007cba;
}

/* 키워드 태그 */
.keywords {
    margin: 20px 0;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.keyword-tag {
    background: #e3f2fd;
    color: #007cba;
    padding: 8px 15px;
    border-radius: 20px;
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.3s;
    cursor: pointer;
}

.keyword-tag:hover {
    background: #007cba;
    color: white;
}

/* 콘텐츠 아이템 */
.content-item {
    border: 1px solid #e0e0e0;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 15px;
    transition: all 0.3s;
    cursor: pointer;
}

.content-item:hover {
    border-color: #007cba;
    box-shadow: 0 4px 15px rgba(0,124,186,0.1);
}

.content-item h3 {
    color: #007cba;
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.content-item p {
    color: #666;
    line-height: 1.5;
}

.content-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 15px;
    font-size: 0.9rem;
    color: #999;
}

/* 버튼 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    background: #007cba;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

.btn:hover {
    background: #0056b3;
}

.btn-secondary {
    background: #6c757d;
}

.btn-secondary:hover {
    background: #545b62;
}

.btn-danger {
    background: #dc3545;
}

.btn-danger:hover {
    background: #c82333;
}

/* 폼 */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #333;
}

.form-input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 5px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s;
}

.form-input:focus {
    border-color: #007cba;
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* 로그인 폼 */
.login-container {
    max-width: 400px;
    margin: 100px auto;
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.login-container h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #007cba;
}

/* 관리자 페이지 */
.admin-container {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e0e0e0;
}

.admin-header h2 {
    color: #007cba;
    font-size: 2rem;
}

/* 테이블 */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.table th,
.table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.table th {
    background: #f8f9fa;
    font-weight: 600;
    color: #333;
}

.table tr:hover {
    background: #f8f9fa;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .product-groups {
        grid-template-columns: 1fr;
    }
    
    .nav-content {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.5rem;
    }
    
    .product-group-btn {
        padding: 20px 15px;
    }
    
    .content-list {
        padding: 20px;
    }
}

/* 디버그 스타일 */
.debug-info {
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 5px;
    padding: 15px;
    margin: 20px 0;
    font-family: monospace;
    font-size: 0.9rem;
    color: #495057;
}

/* 로딩 스피너 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #007cba;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}