/**
 * 파일명: style.css
 * 파일 위치: /assets/css/style.css
 * 기능: 프론트엔드 스타일 (KnowledgePulse 스타일)
 * 작성일: 2025-12-30
 */

/* === 컬러 변수 === */
:root {
    --color-primary: #16423C;
    --color-primary-dark: #0f2f2a;
    --color-secondary: #6A9C89;
    --color-accent: #C4DAD2;
    --color-light: #E9EFEC;
    --color-background: #F5F7F6;
    --color-white: #ffffff;
    --color-text: #1a1a1a;
    --color-text-muted: #6c757d;
    --border-radius: 12px;
    --border-radius-lg: 20px;
    --box-shadow: 0 4px 20px rgba(22, 66, 60, 0.08);
    --box-shadow-hover: 0 8px 30px rgba(22, 66, 60, 0.15);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--color-text);
    line-height: 1.7;
    background-color: var(--color-background);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--color-secondary);
}

/* === 네비게이션 === */
.navbar {
    background-color: var(--color-white) !important;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.navbar-brand {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-primary) !important;
    letter-spacing: 1px;
}

.navbar-brand i {
    color: var(--color-secondary);
}

.nav-link {
    color: var(--color-text) !important;
    font-weight: 500;
    padding: 0.5rem 1.25rem !important;
    border-radius: 8px;
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary) !important;
    background-color: var(--color-light);
}

/* === 언어 선택기 === */
.lang-switcher .dropdown-toggle {
    background-color: var(--color-light);
    border: none;
    color: var(--color-primary);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: 500;
}

.lang-switcher .dropdown-toggle:hover {
    background-color: var(--color-accent);
}

.lang-switcher .dropdown-menu {
    border: none;
    box-shadow: var(--box-shadow);
    border-radius: var(--border-radius);
    padding: 0.5rem;
}

.lang-switcher .dropdown-item {
    border-radius: 6px;
    padding: 0.5rem 1rem;
}

.lang-switcher .dropdown-item:hover {
    background-color: var(--color-light);
}

.lang-switcher .dropdown-item.active {
    background-color: var(--color-primary);
    color: var(--color-white);
}

/* === 히어로 섹션 === */
.hero-section {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    padding: 5rem 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: var(--color-secondary);
    border-radius: 50%;
    opacity: 0.1;
}

.hero-section::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: var(--color-accent);
    border-radius: 50%;
    opacity: 0.1;
}

.hero-section h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-white);
    line-height: 1.2;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
}

.hero-section .lead {
    color: var(--color-accent);
    font-size: 1.2rem;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    background: rgba(106, 156, 137, 0.3);
    color: var(--color-accent);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

/* === 통계 섹션 === */
.stats-section {
    background-color: var(--color-white);
    padding: 4rem 0;
    margin-top: -2rem;
    position: relative;
    z-index: 10;
}

.stats-container {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    padding: 2rem 3rem;
    margin-top: -4rem;
}

.stat-item {
    text-align: center;
    padding: 1.5rem 1rem;
    position: relative;
}

.stat-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 50px;
    width: 1px;
    background: var(--color-accent);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: 0.5rem;
    font-weight: 500;
}

/* === 섹션 공통 === */
.section {
    padding: 5rem 0;
}

.section-header {
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.section-subtitle {
    color: var(--color-text-muted);
    font-size: 1.1rem;
}

/* === 사이트 카드 === */
.site-card {
    background: var(--color-white);
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    overflow: hidden;
    height: 100%;
}

.site-card:hover {
    box-shadow: var(--box-shadow-hover);
    transform: translateY(-5px);
}

.site-card .card-body {
    padding: 1.5rem;
}

.site-card .card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.site-card .card-title a {
    color: var(--color-text);
}

.site-card .card-title a:hover {
    color: var(--color-primary);
}

.site-card .card-text {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.site-card .card-footer {
    background: transparent;
    border-top: 1px solid var(--color-light);
    padding: 1rem 1.5rem;
}

/* === 뱃지 === */
.badge {
    font-weight: 500;
    padding: 0.4em 0.8em;
    border-radius: 6px;
}

.badge.bg-primary-custom {
    background-color: var(--color-primary) !important;
}

.badge.bg-secondary-custom {
    background-color: var(--color-secondary) !important;
}

.badge.bg-light-custom {
    background-color: var(--color-light) !important;
    color: var(--color-primary) !important;
}

/* === 버튼 === */
.btn {
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    transition: var(--transition);
}

.btn-primary-custom {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

.btn-primary-custom:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-white);
}

.btn-secondary-custom {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
    color: var(--color-white);
}

.btn-secondary-custom:hover {
    background-color: #5a8a79;
    border-color: #5a8a79;
    color: var(--color-white);
}

.btn-outline-custom {
    background-color: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

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

.btn-light-custom {
    background-color: var(--color-light);
    border: none;
    color: var(--color-primary);
}

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

/* === 리포트 페이지 === */
.report-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    padding: 3rem 0;
    position: relative;
    overflow: hidden;
}

.report-header::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 300px;
    height: 300px;
    background: var(--color-secondary);
    border-radius: 50%;
    opacity: 0.1;
}

.report-header h1 {
    color: var(--color-white);
    font-size: 1.75rem;
    font-weight: 600;
}

.report-header a {
    color: var(--color-accent);
}

.report-header a:hover {
    color: var(--color-white);
}

/* === 요약 카드 === */
.summary-card {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    padding: 2rem;
    margin-top: -3rem;
    position: relative;
    z-index: 10;
}

.summary-item {
    text-align: center;
    padding: 1rem;
}

.summary-number {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
}

.summary-number.internal {
    color: var(--color-primary);
}

.summary-number.external {
    color: var(--color-secondary);
}

.summary-number.total {
    color: var(--color-text);
}

.summary-label {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: 0.5rem;
    font-weight: 500;
}

/* === 테이블 === */
.table-container {
    background: var(--color-white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

.table {
    margin-bottom: 0;
}

.table thead {
    background-color: var(--color-primary);
}

.table thead th {
    color: var(--color-white);
    font-weight: 600;
    padding: 1rem 1.25rem;
    border: none;
}

.table tbody td {
    padding: 1rem 1.25rem;
    vertical-align: middle;
    border-color: var(--color-light);
}

.table tbody tr:hover {
    background-color: var(--color-light);
}

.link-url {
    color: var(--color-text-muted);
    word-break: break-all;
    font-size: 0.875rem;
}

.link-url:hover {
    color: var(--color-primary);
}

/* === 인기 페이지 === */
.page-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    padding: 3rem 0;
    position: relative;
    overflow: hidden;
}

.page-header h1 {
    color: var(--color-white);
    font-size: 2rem;
    font-weight: 700;
}

.page-header p {
    color: var(--color-accent);
}

.rank-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.875rem;
}

.rank-badge.top {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-white);
}

.rank-badge.normal {
    background: var(--color-light);
    color: var(--color-text-muted);
}

/* === 관련 사이트 === */
.related-section {
    background-color: var(--color-light);
    padding: 4rem 0;
}

.related-card {
    background: var(--color-white);
    border: none;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.related-card:hover {
    box-shadow: var(--box-shadow);
    transform: translateY(-2px);
}

/* === 브레드크럼 === */
.breadcrumb {
    background: transparent;
    padding: 0;
    margin-bottom: 1rem;
}

.breadcrumb-item a {
    color: var(--color-accent);
}

.breadcrumb-item.active {
    color: var(--color-white);
}

.breadcrumb-item + .breadcrumb-item::before {
    color: var(--color-accent);
}

/* === 푸터 === */
.footer {
    background: var(--color-primary);
    color: var(--color-white);
    padding: 4rem 0 2rem;
}

.footer h5,
.footer h6 {
    color: var(--color-white);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.footer a {
    color: var(--color-accent);
    transition: var(--transition);
}

.footer a:hover {
    color: var(--color-white);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    margin-top: 3rem;
}

/* === 장식 요소 === */
.decoration-circle {
    position: absolute;
    border-radius: 50%;
    opacity: 0.1;
}

.decoration-circle.green {
    background: var(--color-secondary);
}

.decoration-circle.light {
    background: var(--color-accent);
}

/* === 알림 === */
.alert-custom {
    background-color: var(--color-light);
    border: none;
    border-left: 4px solid var(--color-secondary);
    border-radius: var(--border-radius);
    color: var(--color-text);
}

/* === 로딩 === */
.loading-spinner {
    color: var(--color-primary);
}

/* === 반응형 === */
@media (max-width: 992px) {
    .hero-section h1 {
        font-size: 2.25rem;
    }
    
    .stat-item:not(:last-child)::after {
        display: none;
    }
    
    .stats-container {
        padding: 1.5rem;
    }
}

@media (max-width: 768px) {
    .hero-section {
        padding: 3rem 0;
    }
    
    .hero-section h1 {
        font-size: 1.75rem;
    }
    
    .stat-number {
        font-size: 1.75rem;
    }
    
    .summary-number {
        font-size: 1.75rem;
    }
    
    .section {
        padding: 3rem 0;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .table thead th,
    .table tbody td {
        padding: 0.75rem;
        font-size: 0.875rem;
    }
}

/* === 유틸리티 === */
.text-primary-custom {
    color: var(--color-primary) !important;
}

.text-secondary-custom {
    color: var(--color-secondary) !important;
}

.bg-primary-custom {
    background-color: var(--color-primary) !important;
}

.bg-secondary-custom {
    background-color: var(--color-secondary) !important;
}

.bg-light-custom {
    background-color: var(--color-light) !important;
}

/* === 모바일 링크 카드 === */
.link-card {
    background: var(--color-white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

.link-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--color-light);
    border-bottom: 1px solid var(--color-accent);
}

.link-number {
    font-weight: 600;
    color: var(--color-primary);
    font-size: 0.875rem;
}

.link-badges {
    display: flex;
    gap: 0.5rem;
}

.link-badges .badge {
    font-size: 0.7rem;
    padding: 0.3em 0.6em;
}

.link-card-body {
    padding: 1rem;
}

.link-anchor strong {
    font-size: 0.95rem;
    color: var(--color-text);
    word-break: break-word;
}

.link-url-mobile {
    background: var(--color-light);
    padding: 0.75rem;
    border-radius: 8px;
    margin-top: 0.5rem;
}

.link-url-text {
    color: var(--color-secondary);
    font-size: 0.85rem;
    word-break: break-all;
    display: block;
    line-height: 1.5;
}

.link-url-text:hover {
    color: var(--color-primary);
}

/* 모바일 링크 카드 뱃지 크기 */
@media (max-width: 991px) {
    .link-badges .badge {
        font-size: 0.65rem;
    }
}


/* === 모바일 인기 사이트 카드 === */
.popular-card {
    background: var(--color-white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

.popular-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--color-light);
    border-bottom: 1px solid var(--color-accent);
}

.popular-views {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.popular-views i {
    margin-right: 0.25rem;
}

.popular-card-body {
    padding: 1rem;
}

.popular-title {
    margin-bottom: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.4;
}

.popular-title a {
    color: var(--color-primary);
    text-decoration: none;
}

.popular-title a:hover {
    color: var(--color-secondary);
}

.popular-url {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
    word-break: break-all;
    line-height: 1.4;
}

.popular-stats {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.popular-stats .badge {
    font-size: 0.75rem;
    padding: 0.4em 0.7em;
}

.popular-card-footer {
    padding: 0.75rem 1rem;
    background: var(--color-light);
    border-top: 1px solid var(--color-accent);
}

/* 모바일 순위 뱃지 크기 조정 */
@media (max-width: 991px) {
    .rank-badge {
        width: 32px;
        height: 32px;
        font-size: 0.8rem;
    }
}


/* === 모바일 네비게이션 언어 선택 === */
.nav-lang-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-lang-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.nav-lang-item {
    display: inline-block;
    padding: 0.4rem 0.75rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    background: var(--color-light);
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.2s ease;
}

.nav-lang-item:hover {
    background: var(--color-accent);
    color: var(--color-primary);
}

.nav-lang-item.active {
    background: var(--color-primary);
    color: var(--color-white);
}

/* 모바일 네비게이션 토글 버튼 */
.navbar-toggler {
    border: 1px solid var(--color-accent);
    padding: 0.4rem 0.6rem;
}

.navbar-toggler:focus {
    box-shadow: none;
    outline: none;
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%2316423C' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* 모바일 메뉴 열렸을 때 */
@media (max-width: 991px) {
    .navbar-collapse {
        padding: 1rem 0;
    }
    
    .navbar-nav .nav-link {
        padding: 0.75rem 1rem !important;
        border-radius: 8px;
        margin-bottom: 0.25rem;
    }
    
    .navbar-nav .nav-link.active {
        background: var(--color-light);
    }
}


/* === 모바일 버튼 개선 === */
@media (max-width: 576px) {
    /* 히어로 섹션 버튼 */
    .hero-section .btn-lg {
        font-size: 0.875rem;
        padding: 0.6rem 1rem;
        white-space: nowrap;
    }
    
    .hero-section .btn-lg i {
        display: none;
    }
    
    /* 히어로 버튼 세로 배치 */
    .hero-section .d-flex.gap-3 {
        flex-direction: column;
        gap: 0.75rem !important;
        width: 100%;
        max-width: 250px;
        margin: 0 auto;
    }
    
    .hero-section .d-flex.gap-3 .btn {
        width: 100%;
    }
    
    /* 섹션 헤더 버튼 */
    .section-header {
        flex-direction: column;
        align-items: flex-start !important;
        gap: 1rem;
    }
    
    .section-header .btn {
        font-size: 0.8rem;
        padding: 0.5rem 1rem;
    }
    
    /* 카드 푸터 버튼 */
    .site-card .card-footer .btn,
    .popular-card-footer .btn {
        font-size: 0.8rem;
        padding: 0.5rem 0.75rem;
    }
}

/* 태블릿 크기 */
@media (max-width: 768px) and (min-width: 577px) {
    .hero-section .btn-lg {
        font-size: 0.9rem;
        padding: 0.6rem 1.25rem;
    }
    
    .hero-section .btn-lg i {
        margin-right: 0.25rem !important;
    }
}

/* === 페이지네이션 === */
.pagination {
    gap: 0.25rem;
}

.pagination .page-link {
    border: none;
    border-radius: 8px !important;
    color: var(--color-primary);
    padding: 0.5rem 0.85rem;
    margin: 0 2px;
    transition: var(--transition);
}

.pagination .page-link:hover {
    background: var(--color-light);
    color: var(--color-primary);
}

.pagination .page-item.active .page-link {
    background: var(--color-primary);
    color: var(--color-white);
}

.pagination .page-item.disabled .page-link {
    background: transparent;
    color: var(--color-text-muted);
}

/* ============================================================================
   SEO 숨김 콘텐츠 (검색엔진용)
   ============================================================================ */
.visually-hidden-seo {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}