/* RA0 Edition - 카드 플립 게시판 스킨 */

/* 폰트 불러오기 */
@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard/dist/web/static/pretendard.css');
@import url('https://fonts.googleapis.com/css2?family=Shadows+Into+Light+Two&display=swap');

:root {
    --font-korean: 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-english: 'Shadows Into Light Two', cursive;
}

.anchor-list-container,
.anchor-view-wrap {
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px;
    font-family: var(--font-korean);
}

.board-title,
.vh-subject,
.chip-subject,
.back-title {
    font-family: var(--font-korean);
}

/* 헤더 */
.board-header {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 30px;
}

.board-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--content-font-color);
}

.board-title::after {
    content: '//';
    font-size: 1rem;
    color: var(--accent-color);
    margin-left: 5px;
}

/* 정렬 옵션 */
.sort-options {
    display: flex;
    gap: 5px;
    margin-left: 15px;
}

.sort-btn {
    padding: 6px 12px;
    border-radius: 15px;
    font-size: 0.8rem;
    text-decoration: none;
    color: var(--text-muted);
    border: 1px solid var(--border-light);
    transition: all 0.2s;
}

.sort-btn:hover,
.sort-btn.active {
    background: var(--accent-color);
    color: var(--black);
    border-color: var(--accent-color);
}

.btn-write {
    margin-left: auto;
    padding: 8px;
    background: var(--btn-accent-bg);
    color: var(--btn-accent-text);
    text-decoration: none;
    border-radius: 4px;
}

/* 카테고리 */
.category-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 30px;
}

.cate-btn {
    padding: 6px 14px;
    border: 1px solid var(--border-light);
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 20px;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.cate-btn:hover,
.cate-btn.active {
    background: var(--btn-accent-bg);
    color: var(--btn-accent-text);
    border-color: var(--btn-accent-bg);
}

/* 그리드 */
.chip-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 15px;
    perspective: 1000px;
}

/* 카드 플립 - 모바일 호환성 강화 */
.flip-card {
    position: relative;
    aspect-ratio: 4 / 5;
    cursor: pointer;
    -webkit-perspective: 1000px;
    perspective: 1000px;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.4, 0.2, 0.2, 1);
    -webkit-transform-style: preserve-3d;
    transform-style: preserve-3d;
}

.flip-card.flipped .flip-card-inner {
    -webkit-transform: rotateY(180deg);
    transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: var(--card-border-radius);
    overflow: hidden;
    border: 1px solid var(--card-border-color);
}

/* 앞면 */
.flip-card-front {
    background: var(--card-bg-color);
    transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
    z-index: 2;
}

.flip-card:hover .flip-card-front,
.flip-card.touch-hover .flip-card-front {
    border-color: var(--accent-color);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgb(from var(--accent-color) r g b / 15%);
}

.chip-thumb {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.chip-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s;
}

.flip-card:hover .chip-thumb img,
.flip-card.touch-hover .chip-thumb img {
    transform: scale(1.05);
}

.chip-thumb .no-thumb-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
    color: var(--text-muted);
    opacity: 0.5;
}

/* 그라데이션 - 20% */
.chip-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 20%;
    background: linear-gradient(to top, var(--black) 0%, transparent 100%);
    opacity: 0.85;
}

/* 커스텀 태그 - 오른쪽 상단 */
.card-custom-tag {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 10;
    background: var(--accent-color);
    color: var(--black);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 12px;
}

.chip-info {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 20px;
    z-index: 2;
    display: flex;
    flex-direction: column;
}

.chip-cate {
    font-size: 11px;
    color: var(--black);
    background: var(--accent-color);
    padding: 2px 6px;
    border-radius: 2px;
    font-weight: 700;
    align-self: flex-start;
    margin-bottom: 8px;
}

.chip-subject {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--white);
    margin: 0;
    transition: color 0.3s;
}

.flip-card:hover .chip-subject,
.flip-card.touch-hover .chip-subject {
    color: var(--accent-color);
}

.chip-desc {
    height: 0;
    opacity: 0;
    font-size: 0.85rem;
    color: #f1f1f1;
    margin-top: 0;
    line-height: 1.4;
    overflow: hidden;
    transition: all 0.3s;
}

.flip-card:hover .chip-desc,
.flip-card.touch-hover .chip-desc {
    height: 40px;
    opacity: 1;
    margin-top: 10px;
}

/* 뒷면 - 모바일 호환성 강화 */
.flip-card-back {
    background: var(--card-bg-color);
    -webkit-transform: rotateY(180deg);
    transform: rotateY(180deg);
    z-index: 1;
}

.back-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    filter: blur(8px);
    opacity: 0.2;
    transform: scale(1.1);
}

.back-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 20px;
}

.back-header {
    flex-shrink: 0;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-light);
    margin-bottom: 15px;
}

.back-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--content-font-color);
    margin: 8px 0 0 0;
}

.back-body {
    flex: 1;
    overflow-y: auto;
    -ms-overflow-style: none;
    scrollbar-width: none;
    cursor: grab;
    -webkit-overflow-scrolling: touch;
}

.back-body::-webkit-scrollbar { display: none; }
.back-body.grabbing { cursor: grabbing; }

.back-text {
    font-size: 0.9rem;
    color: var(--content-font-color);
    line-height: 1.7;
    word-break: keep-all;
}

.back-text p { margin-bottom: 12px; }
.back-text img { max-width: 100%; height: auto; border-radius: 4px; margin: 10px 0; }
.back-text strong, .back-text b { font-weight: 700; }
.back-text ul, .back-text ol { margin: 10px 0; padding-left: 20px; }

.back-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    font-size: 1.5rem;
}

.back-error {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--error-color);
    font-size: 0.9rem;
    text-align: center;
    padding: 20px;
}

.back-files {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px dashed var(--border-light);
}

.back-files strong { display: block; font-size: 0.8rem; color: var(--text-muted); margin-bottom: 8px; }
.back-files ul { list-style: none; margin: 0; padding: 0; }
.back-files a { display: inline-flex; align-items: center; gap: 6px; font-size: 0.8rem; color: var(--accent-color); text-decoration: none; padding: 4px 8px; border-radius: 4px; background: rgb(from var(--accent-color) r g b / 10%); }

.back-footer {
    flex-shrink: 0;
    padding-top: 15px;
    border-top: 1px solid var(--border-light);
    margin-top: 15px;
    text-align: center;
}

.btn-detail {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--btn-accent-bg);
    color: var(--btn-accent-text);
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 600;
}

/* 빈 상태 */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 80px 20px;
    color: var(--text-muted);
}

.empty-state i { font-size: 3rem; margin-bottom: 15px; opacity: 0.5; display: block; }
.btn-first { display: inline-block; padding: 12px 24px; background: var(--btn-accent-bg); color: var(--btn-accent-text); text-decoration: none; border-radius: 4px; margin-top: 15px; }

/* 페이징 */
.board-paging { margin-top: 40px; text-align: center; }
.board-paging a, .board-paging strong { display: inline-block; padding: 8px 12px; margin: 0 2px; border-radius: 4px; text-decoration: none; color: var(--text-muted); }
.board-paging a:hover { background: var(--card-bg-color); }
.board-paging strong { background: var(--btn-accent-bg); color: var(--btn-accent-text); }

/* 검색 */
.board-search { margin-top: 30px; display: flex; justify-content: center; }
.board-search form { display: flex; gap: 8px; }
.board-search select, .board-search input[type="text"] { padding: 10px 14px; border: 1px solid var(--border-light); border-radius: 4px; background: var(--card-bg-color); color: var(--content-font-color); font-size: 0.9rem; }
.board-search input[type="text"] { width: 200px; }
.board-search button { padding: 10px 16px; background: var(--btn-accent-bg); color: var(--btn-accent-text); border: 0; border-radius: 4px; cursor: pointer; }

/* VIEW 스타일 */
.view-header { margin-bottom: 30px; }
.vh-category { display: inline-block; font-size: 0.9rem; color: var(--accent-color); font-weight: 700; margin-bottom: 10px; }
.vh-subject { font-size: 2.5rem; font-weight: 800; margin-bottom: 5px; color: var(--content-font-color); }
.vh-meta { display: none; }

.view-container { display: grid; grid-template-columns: 220px 1fr; gap: 30px; height: calc(100vh - 250px); }
.anchor-nav { position: sticky; top: 0; padding: 20px 0; border-left: 2px solid var(--border-light); background: var(--card-bg-color); border-radius: var(--card-border-radius); }
.anchor-list { list-style: none; margin: 0; padding: 0; }
.anchor-link { display: block; padding: 10px 20px; color: var(--text-muted); text-decoration: none; transition: all 0.3s; position: relative; }
.anchor-link:hover, .anchor-link.active { color: var(--accent-color); }
.anchor-link.active::before { content: ''; position: absolute; left: -2px; top: 0; height: 100%; width: 2px; background: var(--accent-color); }

.view-content { overflow-y: auto; background: var(--card-bg-color); border-radius: var(--card-border-radius); padding: 50px; }
.view-content.no-sidebar { grid-column: 1 / -1; }

.cs-title { font-size: 1.6rem; font-weight: 700; margin: 0 0 25px 0; color: var(--content-font-color); display: flex; align-items: center; }
.cs-title::before { content: '✦'; color: var(--accent-color); margin-right: 10px; }
.cs-body { font-size: var(--content-font-size); color: var(--content-font-color); line-height: 1.8; }
.cs-body p { margin-bottom: 20px; }
.cs-body img { max-width: 100%; height: auto; border-radius: var(--card-border-radius); margin: 30px 0; }
.cs-body strong { color: var(--accent-color); }

.view-btn-wrap { display: flex; justify-content: flex-end; gap: 5px; }
.btn-edit, .btn-delete, .btn-list { padding: 8px; background: var(--btn-primary-bg); border: 0; color: var(--btn-primary-text); text-decoration: none; border-radius: var(--btn-primary-radius); }
.btn-edit:hover, .btn-list:hover, .btn-delete:hover { background: var(--btn-accent-bg); color: var(--btn-accent-text); }

.view-navigation { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 40px; }
.nav-prev, .nav-next { padding: 20px; background: var(--card-bg-color); border: 1px solid var(--border-light); border-radius: var(--card-border-radius); text-decoration: none; }
.nav-next { text-align: right; }
.nav-label { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 5px; display: block; }
.nav-subject { font-weight: 600; color: var(--content-font-color); }
.nav-prev:not(.empty):hover, .nav-next:not(.empty):hover { border-color: var(--accent-color); }
.nav-prev:not(.empty):hover .nav-subject, .nav-next:not(.empty):hover .nav-subject { color: var(--accent-color); }
.nav-prev.empty, .nav-next.empty { opacity: 0.3; }

/* 반응형 */
@media (max-width: 768px) {
    .board-header { flex-direction: column; align-items: flex-start; }
    .sort-options { margin-left: 0; }
    .btn-write { margin-left: 0; }
    
    .chip-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .flip-card { aspect-ratio: 3 / 4; }
    .chip-desc { display: none; }
    .flip-card.touch-hover .chip-desc { display: block; height: 40px; opacity: 1; margin-top: 10px; }
    
    .back-content { padding: 15px; }
    .back-title { font-size: 0.9rem; }
    .back-text { font-size: 0.85rem; }
    
    .view-container { grid-template-columns: 1fr; }
    .anchor-nav { border-left: none; border-bottom: 1px solid var(--border-light); }
    .anchor-list { display: flex; overflow-x: auto; }
    .anchor-link { padding: 10px 15px; white-space: nowrap; }
    
    .vh-subject { font-size: 1.8rem; }
    .view-navigation { grid-template-columns: 1fr; }
    .board-search form { flex-wrap: wrap; }
    .board-search input[type="text"] { width: 100%; }
}