/* assets/css/style.css */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #667eea;
    --primary-dark: #5a67d8;
    --secondary: #764ba2;
    --accent: #f093fb;
    --dark: #1a1a2e;
    --gray: #888;
    --light-gray: #f5f5f5;
    --border: #e0e0e0;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --radius: 12px;
    --nav-height: 64px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: #f0f2f5;
    color: #333;
    padding-top: var(--nav-height);
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    z-index: 1000;
    display: flex;
    align-items: center;
}

.nav-container {
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    gap: 20px;
    height: 100%;
}

/* Logo */
.nav-logo a {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--primary);
    font-size: 20px;
    font-weight: 700;
    white-space: nowrap;
}

.nav-logo i {
    font-size: 26px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-logo span {
    -webkit-text-fill-color: var(--dark);
}

/* 分区 */
.nav-categories {
    display: flex;
    align-items: center;
    gap: 5px;
    position: relative;
}

.category-link {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 14px;
    border-radius: 8px;
    text-decoration: none;
    color: var(--gray);
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
}

.category-link:hover,
.category-link.active {
    background: var(--light-gray);
    color: var(--primary);
}

.category-dropdown {
    position: relative;
}

.category-dropdown .dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    background: white;
    border-radius: var(--radius);
    box-shadow: 0 10px 40px rgba(0,0,0,0.15);
    padding: 8px 0;
    margin-top: 8px;
    z-index: 100;
}

.category-dropdown:hover .dropdown-content {
    display: block;
}

.dropdown-content a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    text-decoration: none;
    color: #555;
    font-size: 14px;
    transition: all 0.2s;
}

.dropdown-content a:hover {
    background: var(--light-gray);
    color: var(--primary);
}

.dropdown-content a i {
    width: 20px;
    color: var(--gray);
}

/* 搜索栏 */
.nav-search {
    flex: 1;
    max-width: 600px;
    position: relative;
}

.nav-search form {
    display: flex;
    background: var(--light-gray);
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.3s;
}

.nav-search form:focus-within {
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.nav-search input {
    flex: 1;
    padding: 10px 18px;
    border: none;
    background: transparent;
    font-size: 14px;
    outline: none;
    color: #333;
}

.nav-search input::placeholder {
    color: #aaa;
}

.nav-search button {
    padding: 10px 18px;
    border: none;
    background: transparent;
    color: var(--gray);
    cursor: pointer;
    transition: color 0.3s;
}

.nav-search button:hover {
    color: var(--primary);
}

/* 右侧操作 */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 20px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.upload-btn {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
}

.upload-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

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

.login-btn:hover {
    background: var(--light-gray);
}

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

.register-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.user-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 12px 4px 4px;
    border-radius: 20px;
    background: var(--light-gray);
    text-decoration: none;
    color: #333;
}

.user-btn img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.user-btn span {
    font-weight: 500;
    font-size: 14px;
}

.user-dropdown {
    position: relative;
}

.user-dropdown .dropdown-menu {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    min-width: 200px;
    background: white;
    border-radius: var(--radius);
    box-shadow: 0 10px 40px rgba(0,0,0,0.15);
    padding: 8px 0;
    margin-top: 8px;
    z-index: 100;
}

.user-dropdown:hover .dropdown-menu {
    display: block;
}

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    text-decoration: none;
    color: #555;
    font-size: 14px;
    transition: all 0.2s;
}

.dropdown-menu a:hover {
    background: var(--light-gray);
    color: var(--primary);
}

.dropdown-menu a i {
    width: 20px;
    text-align: center;
}

/* ===== 页面内容 ===== */
.page-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* ===== 首页布局 ===== */
.home-layout {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 20px;
}

/* 轮播图 */
.slider-container {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--dark);
    aspect-ratio: 16/9;
}

.slider-slides {
    display: flex;
    transition: transform 0.5s ease;
    height: 100%;
}

.slider-slide {
    min-width: 100%;
    height: 100%;
    position: relative;
}

.slider-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.slider-slide .slide-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 40px 30px;
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    color: white;
}

.slider-slide .slide-overlay h3 {
    font-size: 22px;
    margin-bottom: 5px;
}

.slider-slide .slide-overlay p {
    opacity: 0.8;
    font-size: 14px;
}

.slider-dots {
    position: absolute;
    bottom: 15px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 10;
}

.slider-dots .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255,255,255,0.4);
    cursor: pointer;
    transition: all 0.3s;
    border: none;
}

.slider-dots .dot.active {
    background: white;
    transform: scale(1.2);
}

.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0,0,0,0.4);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 18px;
    transition: all 0.3s;
    z-index: 10;
    backdrop-filter: blur(4px);
}

.slider-btn:hover {
    background: rgba(0,0,0,0.6);
}

.slider-btn.prev { left: 15px; }
.slider-btn.next { right: 15px; }

/* 右侧推荐 */
.side-recommend {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.side-recommend .section-title {
    font-size: 16px;
    font-weight: 600;
    color: #333;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border);
}

.side-recommend .video-item {
    display: flex;
    gap: 12px;
    padding: 10px;
    background: white;
    border-radius: var(--radius);
    transition: all 0.3s;
    text-decoration: none;
    color: inherit;
}

.side-recommend .video-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow);
}

.side-recommend .video-item .thumb {
    width: 160px;
    height: 90px;
    border-radius: 6px;
    object-fit: cover;
    flex-shrink: 0;
    background: var(--light-gray);
}

.side-recommend .video-item .info {
    flex: 1;
    min-width: 0;
}

.side-recommend .video-item .info .title {
    font-size: 14px;
    font-weight: 500;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.side-recommend .video-item .info .meta {
    font-size: 12px;
    color: var(--gray);
    margin-top: 4px;
}

/* ===== 视频网格 ===== */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.video-grid .video-card {
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
    transition: all 0.3s;
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow);
}

.video-grid .video-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 10px 40px rgba(0,0,0,0.12);
}

.video-grid .video-card .thumb {
    position: relative;
    padding-top: 56.25%;
    background: var(--dark);
}

.video-grid .video-card .thumb img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-grid .video-card .thumb .duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0,0,0,0.8);
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
}

.video-grid .video-card .info {
    padding: 14px;
}

.video-grid .video-card .info .title {
    font-weight: 500;
    font-size: 15px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 8px;
}

.video-grid .video-card .info .meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: var(--gray);
}

.video-grid .video-card .info .meta .up {
    display: flex;
    align-items: center;
    gap: 4px;
}

.video-grid .video-card .info .meta .up img {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    object-fit: cover;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .home-layout {
        grid-template-columns: 1fr;
    }
    .side-recommend {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-categories {
        display: none;
    }
    .nav-search {
        flex: 1;
        max-width: none;
    }
    .video-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
    .side-recommend {
        grid-template-columns: 1fr;
    }
    .nav-logo span {
        font-size: 16px;
    }
    .user-btn span {
        display: none;
    }
    .nav-actions .register-btn span {
        display: none;
    }
    .page-content {
        padding: 12px;
    }
}

@media (max-width: 480px) {
    .video-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }
    .video-grid .video-card .info {
        padding: 10px;
    }
    .video-grid .video-card .info .title {
        font-size: 13px;
    }
    .video-grid .video-card .info .meta {
        font-size: 11px;
        flex-wrap: wrap;
    }
}