/* ========================================
   YOUTUBE STYLE - 통합 CSS 시스템
   ======================================== */

/* ========================================
   YouTube 색상 팔레트 및 변수
   ======================================== */

:root {
    /* YouTube 브랜드 색상 */
    --yt-red: #FF0000;
    --yt-red-hover: #CC0000;
    --yt-dark-bg: #0F0F0F;
    --yt-darker-bg: #0A0A0A;
    --yt-card-bg: #212121;
    --yt-hover-bg: #3A3A3A;
    
    /* 텍스트 색상 */
    --yt-text-primary: #F1F1F1;
    --yt-text-secondary: #AAAAAA;
    --yt-text-disabled: #717171;
    
    /* 경계선 및 구분선 */
    --yt-border: #3A3A3A;
    --yt-divider: #404040;
    
    /* 기타 색상 */
    --yt-white: #FFFFFF;
    --yt-black: #000000;
    --yt-blue: #3EA6FF;
    --yt-success: #00C853;
    --yt-warning: #FFB300;
    
    /* 간격 */
    --yt-spacing-xs: 4px;
    --yt-spacing-sm: 8px;
    --yt-spacing-md: 12px;
    --yt-spacing-lg: 16px;
    --yt-spacing-xl: 24px;
    --yt-spacing-2xl: 32px;
    
    /* 그림자 */
    --yt-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --yt-shadow-md: 0 2px 4px rgba(0, 0, 0, 0.3);
    --yt-shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.4);
    
    /* 둥근 모서리 */
    --yt-radius-sm: 4px;
    --yt-radius-md: 8px;
    --yt-radius-lg: 12px;
    --yt-radius-full: 9999px;
    
    /* 전환 효과 */
    --yt-transition: all 0.2s cubic-bezier(0.05, 0, 0, 1);
}

/* ========================================
   기본 리셋 및 전역 스타일
   ======================================== */

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

body {
    font-family: "Roboto", "Arial", sans-serif;
    background-color: var(--yt-dark-bg);
    /* color: var(--yt-text-primary); */
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

img {
    max-width: 100%;
    display: block;
}

/* ========================================
   컨테이너 및 레이아웃
   ======================================== */

.container,
.main-content {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--yt-spacing-xl);
}

/* ========================================
   YouTube 스타일 카드
   ======================================== */

.video-grid,
.image-grid,
.movie-grid,
.drama-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--yt-spacing-xl);
    padding: var(--yt-spacing-lg) 0;
}

.video-card,
.image-card,
.movie-card,
.drama-card {
    background-color: var(--yt-card-bg);
    border-radius: var(--yt-radius-lg);
    overflow: hidden;
    transition: var(--yt-transition);
    cursor: pointer;
}

.video-card:hover,
.image-card:hover,
.movie-card:hover,
.drama-card:hover {
    background-color: var(--yt-hover-bg);
}

/* 썸네일 영역 */
.video-wrapper,
.image-wrapper,
.movie-poster,
.drama-thumbnail {
    position: relative;
    width: 100%;
    padding-top: 56.25%; /* 16:9 비율 */
    background-color: var(--yt-darker-bg);
    overflow: hidden;
    border-radius: var(--yt-radius-md);
}

.video-thumbnail,
.image-thumbnail,
.movie-poster img,
.drama-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--yt-transition);
}

.video-card:hover .video-thumbnail,
.image-card:hover .image-thumbnail,
.movie-card:hover .movie-poster img,
.drama-card:hover .drama-thumbnail img {
    transform: scale(1.05);
}

/* 카드 정보 영역 */
.video-info,
.image-info,
.movie-content,
.drama-content {
    padding: var(--yt-spacing-md);
}

.video-title,
.image-title,
.movie-title,
.drama-title {
    font-size: 14px;
    font-weight: 500;
    line-height: 1.4;
    color: var(--yt-text-primary);
    margin-bottom: var(--yt-spacing-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta,
.image-meta,
.movie-meta,
.drama-meta {
    font-size: 12px;
    color: var(--yt-text-secondary);
    display: flex;
    align-items: center;
    gap: var(--yt-spacing-sm);
    flex-wrap: wrap;
}

/* 카테고리 배지 */
.video-category,
.image-category,
.movie-category,
.drama-category {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    background-color: var(--yt-hover-bg);
    border-radius: var(--yt-radius-full);
    font-size: 11px;
    font-weight: 500;
    color: var(--yt-text-secondary);
}

/* ========================================
   YouTube 스타일 버튼
   ======================================== */

.btn,
.write-button,
.submit-btn,
.change-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--yt-spacing-sm);
    padding: var(--yt-spacing-md) var(--yt-spacing-lg);
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--yt-radius-full);
    transition: var(--yt-transition);
    cursor: pointer;
    border: none;
    text-decoration: none;
}

/* Primary 버튼 (YouTube 빨강) */
.btn-primary,
.submit-btn {
    background-color: var(--yt-red);
    color: var(--yt-white);
}

.btn-primary:hover,
.submit-btn:hover {
    background-color: var(--yt-red-hover);
}

/* Secondary 버튼 */
.btn-secondary,
.cancel-btn,
.btn-back {
    background-color: var(--yt-hover-bg);
    color: var(--yt-text-primary);
}

.btn-secondary:hover,
.cancel-btn:hover,
.btn-back:hover {
    background-color: var(--yt-border);
}

/* 위험 버튼 */
.btn-danger,
.btn-delete {
    background-color: var(--yt-red);
    color: var(--yt-white);
}

.btn-danger:hover,
.btn-delete:hover {
    background-color: var(--yt-red-hover);
}

/* 작은 버튼 */
.btn-sm {
    padding: var(--yt-spacing-xs) var(--yt-spacing-md);
    font-size: 12px;
}

/* 플로팅 액션 버튼 */
.write-button {
    position: fixed;
    bottom: 90px;
    right: var(--yt-spacing-2xl);
    width: 56px;
    height: 56px;
    padding: 0;
    background-color: var(--yt-red);
    color: var(--yt-white);
    border-radius: 50%;
    box-shadow: var(--yt-shadow-lg);
    z-index: 1000;
    transition: var(--yt-transition);
}

.write-button:hover {
    background-color: var(--yt-red-hover);
    transform: scale(1.1);
}

.write-button i {
    font-size: 24px;
}

/* ========================================
   폼 요소 (YouTube 스타일)
   ======================================== */

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--yt-spacing-sm);
    margin-bottom: var(--yt-spacing-lg);
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--yt-text-primary);
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="email"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--yt-spacing-md);
    font-size: 14px;
    background-color: var(--yt-card-bg);
    color: var(--yt-text-primary);
    border: 1px solid var(--yt-border);
    border-radius: var(--yt-radius-sm);
    transition: var(--yt-transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--yt-blue);
    background-color: var(--yt-darker-bg);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
    font-family: inherit;
}

/* ========================================
   카테고리 필터
   ======================================== */

.category-filter {
    display: flex;
    gap: var(--yt-spacing-sm);
    margin-bottom: var(--yt-spacing-xl);
    overflow-x: auto;
    padding: var(--yt-spacing-sm) 0;
    -webkit-overflow-scrolling: touch;
}

.category-filter::-webkit-scrollbar {
    height: 4px;
}

.category-filter::-webkit-scrollbar-track {
    background: var(--yt-card-bg);
}

.category-filter::-webkit-scrollbar-thumb {
    background: var(--yt-border);
    border-radius: var(--yt-radius-sm);
}

.filter-btn {
    padding: var(--yt-spacing-sm) var(--yt-spacing-md);
    background-color: var(--yt-card-bg);
    color: var(--yt-text-primary);
    border: 1px solid var(--yt-border);
    border-radius: var(--yt-radius-full);
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
    transition: var(--yt-transition);
}

.filter-btn:hover,
.filter-btn.active {
    background-color: var(--yt-white);
    color: var(--yt-black);
    border-color: var(--yt-white);
}

/* ========================================
   페이지네이션 (YouTube 스타일)
   ======================================== */

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--yt-spacing-sm);
    margin: var(--yt-spacing-2xl) 0;
    padding: var(--yt-spacing-lg) 0;
}

.page-link,
.page-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 var(--yt-spacing-md);
    background-color: var(--yt-card-bg);
    color: var(--yt-text-primary);
    border: 1px solid var(--yt-border);
    border-radius: var(--yt-radius-sm);
    font-size: 14px;
    transition: var(--yt-transition);
}

.page-link:hover,
.page-btn:hover {
    background-color: var(--yt-hover-bg);
}

.page-link.active,
.page-btn.active {
    background-color: var(--yt-white);
    color: var(--yt-black);
    border-color: var(--yt-white);
}

/* ========================================
   헤더 및 타이틀
   ======================================== */

.list-title,
.category-title,
.write-title,
.view-title {
    font-size: 24px;
    font-weight: 500;
    color: var(--yt-text-primary);
    margin-bottom: var(--yt-spacing-xl);
}

.section-title {
    font-size: 18px;
    font-weight: 500;
    color: var(--yt-text-primary);
    margin-bottom: var(--yt-spacing-lg);
    padding-bottom: var(--yt-spacing-md);
    border-bottom: 1px solid var(--yt-divider);
}

/* ========================================
   메시지 및 알림
   ======================================== */

.success-message,
.error-message,
.category-message {
    padding: var(--yt-spacing-md) var(--yt-spacing-lg);
    border-radius: var(--yt-radius-sm);
    margin-bottom: var(--yt-spacing-lg);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: var(--yt-spacing-sm);
}

.success-message {
    background-color: rgba(0, 200, 83, 0.1);
    color: var(--yt-success);
    border: 1px solid var(--yt-success);
}

.error-message {
    background-color: rgba(255, 0, 0, 0.1);
    color: var(--yt-red);
    border: 1px solid var(--yt-red);
}

/* ========================================
   로딩 인디케이터
   ======================================== */

.loading-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--yt-spacing-2xl);
    gap: var(--yt-spacing-md);
}

.loading-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--yt-border);
    border-top-color: var(--yt-red);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-indicator span {
    font-size: 14px;
    color: var(--yt-text-secondary);
}

/* ========================================
   프로그레스 바
   ======================================== */

.progress-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.progress-overlay {
    background: var(--yt-card-bg);
    border-radius: var(--yt-radius-lg);
    box-shadow: var(--yt-shadow-lg);
    padding: var(--yt-spacing-2xl);
    min-width: 400px;
    max-width: 500px;
}

.progress-header h3 {
    font-size: 18px;
    font-weight: 500;
    color: var(--yt-text-primary);
    margin-bottom: var(--yt-spacing-lg);
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--yt-hover-bg);
    border-radius: var(--yt-radius-sm);
    overflow: hidden;
    margin-bottom: var(--yt-spacing-md);
}

.progress-fill {
    height: 100%;
    background: var(--yt-red);
    border-radius: var(--yt-radius-sm);
    transition: width 0.3s ease;
}

.progress-status {
    font-size: 14px;
    color: var(--yt-text-secondary);
    text-align: center;
}

/* ========================================
   파일 업로드
   ======================================== */

.file-drop-zone {
    border: 2px dashed var(--yt-border);
    border-radius: var(--yt-radius-md);
    padding: var(--yt-spacing-2xl);
    text-align: center;
    background-color: var(--yt-card-bg);
    transition: var(--yt-transition);
}

.file-drop-zone:hover,
.file-drop-zone.dragover {
    border-color: var(--yt-blue);
    background-color: var(--yt-hover-bg);
}

.file-drop-zone i {
    font-size: 48px;
    color: var(--yt-text-disabled);
    margin-bottom: var(--yt-spacing-md);
}

.file-drop-zone p {
    font-size: 14px;
    color: var(--yt-text-primary);
    margin-bottom: var(--yt-spacing-sm);
}

.file-info {
    font-size: 12px;
    color: var(--yt-text-secondary);
}

/* ========================================
   빈 상태 (Empty State)
   ======================================== */

.no-videos,
.no-images,
.no-posts {
    text-align: center;
    padding: var(--yt-spacing-2xl) * 2;
    color: var(--yt-text-secondary);
}

.no-videos i,
.no-images i,
.no-posts i {
    font-size: 64px;
    color: var(--yt-text-disabled);
    margin-bottom: var(--yt-spacing-lg);
}

.no-videos h3,
.no-images h3,
.no-posts h3 {
    font-size: 18px;
    font-weight: 500;
    color: var(--yt-text-primary);
    margin-bottom: var(--yt-spacing-sm);
}

.no-videos p,
.no-images p,
.no-posts p {
    font-size: 14px;
    color: var(--yt-text-secondary);
}

/* ========================================
   회원 페이지 스타일
   ======================================== */

.user-info-card {
    background: linear-gradient(135deg, var(--yt-red) 0%, var(--yt-red-hover) 100%);
    color: var(--yt-white);
    padding: var(--yt-spacing-2xl);
    border-radius: var(--yt-radius-lg);
    margin-bottom: var(--yt-spacing-xl);
}

.user-avatar {
    font-size: 48px;
    margin-bottom: var(--yt-spacing-md);
}

.user-details h2 {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: var(--yt-spacing-sm);
}

.user-details p {
    font-size: 14px;
    opacity: 0.9;
}

/* ========================================
   반응형 디자인
   ======================================== */

@media (max-width: 1024px) {
    .video-grid,
    .image-grid,
    .movie-grid,
    .drama-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: var(--yt-spacing-lg);
    }
}

@media (max-width: 768px) {
    .container,
    .main-content {
        padding: var(--yt-spacing-lg);
    }
    
    .video-grid,
    .image-grid,
    .movie-grid,
    .drama-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: var(--yt-spacing-md);
    }
    
    .write-button {
        bottom: 80px;
        right: var(--yt-spacing-lg);
        width: 48px;
        height: 48px;
    }
    
    .write-button i {
        font-size: 20px;
    }
    
    .list-title,
    .category-title,
    .write-title {
        font-size: 20px;
    }
    
    .pagination {
        overflow-x: auto;
        justify-content: flex-start;
        -webkit-overflow-scrolling: touch;
    }
    
    .pagination::-webkit-scrollbar {
        display: none;
    }
}

@media (max-width: 480px) {
    .container,
    .main-content {
        padding: var(--yt-spacing-md);
    }
    
    .video-grid,
    .image-grid,
    .movie-grid,
    .drama-grid {
        grid-template-columns: 1fr;
        gap: var(--yt-spacing-md);
    }
    
    .list-title,
    .category-title,
    .write-title {
        font-size: 18px;
    }
    
    .progress-overlay {
        min-width: 90%;
        padding: var(--yt-spacing-lg);
    }
}

/* ========================================
   다크 모드 강제 (항상 다크 모드)
   ======================================== */

/* 라이트 모드 지원 제거 - 항상 다크 모드 사용 */

/* ========================================
   유틸리티 클래스
   ======================================== */

.text-center {
    text-align: center;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--yt-spacing-xs); }
.mb-2 { margin-bottom: var(--yt-spacing-sm); }
.mb-3 { margin-bottom: var(--yt-spacing-md); }
.mb-4 { margin-bottom: var(--yt-spacing-lg); }
.mb-5 { margin-bottom: var(--yt-spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--yt-spacing-xs); }
.mt-2 { margin-top: var(--yt-spacing-sm); }
.mt-3 { margin-top: var(--yt-spacing-md); }
.mt-4 { margin-top: var(--yt-spacing-lg); }
.mt-5 { margin-top: var(--yt-spacing-xl); }