/* 基础样式重置 */
:root {
    --base-font-size: var(--font-size, 14px);
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --bg-color: #f5f5f5;
    --texts-color: #333;
    --header-bg: #1a1a1a;
    --card-bg: white;
    --card-shadow: 0 2px 8px rgba(0,0,0,0.1);
    --nav-bg: rgba(255, 255, 255, 0.849);
    --nav-shadow: 0 -2px 10px rgba(0,0,0,0.1);
    --border-color: #f5f5f5;
    --section-bg: white;
    --hover-bg: #f5f5f5;
    --active-bg: #ff4d4f15;
    --active-color: #ff4d4f;
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --texts-color: #f0f0f0;
    --header-bg: #0d0d0d;
    --card-bg: #2d2d2d;
    --card-shadow: 0 2px 8px rgba(0,0,0,0.3);
    --nav-bg: #2d2d2d;
    --nav-shadow: 0 -2px 10px rgba(0,0,0,0.3);
    --border-color: #444;
    --section-bg: #2d2d2d;
    --hover-bg: #3d3d3d;
    --active-bg: #ff4d4f30;
    --active-color: #ff6b6d;
    
    .nav-item .nav-icon {
        filter: invert(1);
    }
    
    .nav-item.active .nav-icon {
        filter: invert(48%) sepia(13%) saturate(3207%) hue-rotate(320deg) brightness(95%) contrast(80%) !important;
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    font-size: var(--base-font-size);
}

body {
    background-color: var(--bg-color);
    color: var(--texts-color);
    max-width: 100vw;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding-bottom: 60px; /* 为底部导航留出空间 */
    /* 禁用文本选择 */
    -webkit-user-select: none; /* Chrome, Safari, Opera */
    -moz-user-select: none;    /* Firefox */
    -ms-user-select: none;     /* IE 10+ */
    user-select: none;        /* 标准语法 */
}

/* 顶部导航栏样式 */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    background-color: var(--header-bg);
    color: white;
    position: sticky;
    top: 0;
    z-index: 100;

}

.logo {
    height: 30px;
    -webkit-user-drag: none;
    user-drag: none;
}

.search-container {
    display: flex;
    align-items: center;
    background: rgba(255,255,255,0.2);
    border-radius: 20px;
    padding: 5px 10px;
    width: 480px;
    transition: width 0.3s ease;
}

.search-container:focus-within {
    width: 580px;
    background: rgba(255,255,255,0.3);
}

#indexSearchInput {
    background: transparent;
    border: none;
    color: white;
    width: 100%;
    padding: 5px;
    outline: none;
}

#indexSearchInput::placeholder {
    color: rgba(255,255,255,0.7);
}

@media (max-width: 768px) {
    .search-container {
        width: 180px; 
    }
}

.search-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    margin-left: 5px;
}

.search-btn img {
    height: 20px;
    filter: brightness(0) invert(1);
}

/* 主要内容区样式 */
.main-content {
    flex: 1;
    padding: 15px;
}

.banner img {
    width: 100%;
    border-radius: 8px;
    margin-bottom: 15px;
}

.video-section h2 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--texts-color);
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr); /* Base: 2 columns */
    gap: 12px;
    align-items: stretch;
}

@media (min-width: 768px) {
    .video-grid {
        grid-template-columns: repeat(4, 1fr); /* 4 columns */
    }
}

@media (min-width: 992px) {
    .video-grid {
        grid-template-columns: repeat(6, 1fr); /* 6 columns */
    }
}

@media (min-width: 1200px) {
    .video-grid {
        grid-template-columns: repeat(8, 1fr); /* 8 columns */
    }
}

.video-card {
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* 单个搜索结果样式 */
#searchResults .video-grid:has(.video-card:only-child) {
    display: flex;
    justify-content: center;
}

#searchResults .video-grid .video-card:only-child {
    width: 50%;
    max-width: 50%;
    margin: 0;
}

.video-card {
    position: relative;
}

.video-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    object-position: top;
}

.play-button {
    position: absolute;
    bottom: 10px;
    right: 10px;
    width: 36px;
    height: 36px;
    background: rgba(0, 0, 0, 0.6);
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.video-card:hover .play-button,
.video-card:active .play-button {
    display: flex;
}

.play-button:hover {
    background: rgba(0, 0, 0, 0.8);
    transform: scale(1.1);
}

.play-button::after {
    content: "";
    width: 0;
    height: 0;
    border-top: 8px solid transparent;
    border-left: 12px solid white;
    border-bottom: 8px solid transparent;
    margin-left: 2px;
}

.video-card h3 {
    font-size: 14px;
    padding: 8px 8px 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.video-desc {
    font-size: 12px;
    color: var(--texts-color);
    opacity: 0.7;
    padding: 0 8px 8px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100%;
    display: inline-block;
    line-height: 1.4;
}

.search-results {
    display: none;
    padding: 15px;
    background: var(--section-bg);
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    margin: 15px 0;
}

.search-results .video-grid {
    display: grid;
    grid-template-columns: repeat(2, 50%);
    gap: 12px;
}

@media (min-width: 768px) {
    .search-results .video-grid {
        grid-template-columns: repeat(4, 25%);
    }
}

/* 侧边导航样式 */
.side-nav {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 80px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    background-color: var(--nav-bg);
    padding-top: 60px; /* 留出顶部导航栏空间 */
    box-shadow: var(--nav-shadow);
    z-index: 90;
    will-change: transform;
    backface-visibility: hidden;
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
    /* 禁用文本选择 */
    -webkit-user-select: none; /* Chrome, Safari, Opera */
    -moz-user-select: none;    /* Firefox */
    -ms-user-select: none;     /* IE 10+ */
    user-select: none;        /* 标准语法 */
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: #666;
    font-size: 12px;
    padding: 15px 0;
    width: 100%;
}

.nav-icon {
    width: 24px;
    height: 24px;
    margin-bottom: 5px;
}

.nav-item.active .nav-icon {
    filter: invert(48%) sepia(13%) saturate(3207%) hue-rotate(320deg) brightness(95%) contrast(80%);
}

.nav-item.active {
    color: var(--active-color);
    background-color: var(--active-bg);
}

.nav-item span {
    margin-top: 5px;
}

/* 调整主容器布局 */
.app-container {
    padding-left: 80px; /* 为左侧导航留出空间 */
    padding-bottom: 0; /* 移除底部padding */
    will-change: padding-left;
    transition: padding-left 0.2s ease;
}



/* 设置页面样式 */
.settings-section {
    padding: 15px;
}

.settings-group {
    background: var(--section-bg);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
    box-shadow: var(--card-shadow);
}

.settings-title {
    font-size: 16px;
    margin-bottom: 12px;
    color: var(--texts-color);
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.setting-item:last-child {
    border-bottom: none;
}

.setting-value {
    color: var(--texts-color);
    opacity: 0.7;
}

/* 开关样式 */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 4px;
    bottom: 4px;
    background-color: var(--section-bg);
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--active-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 24px;
}

.slider.round:before {
    border-radius: 50%;
}

/* 下拉选择框样式 */
.quality-select,
.font-select {
    padding: 5px 10px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background: var(--section-bg);
    color: var(--texts-color);
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    /* 禁用文本选择 */
    -webkit-user-select: none; /* Chrome, Safari, Opera */
    -moz-user-select: none;    /* Firefox */
    -ms-user-select: none;     /* IE 10+ */
    user-select: none;        /* 标准语法 */
}

.modal-content {
    background-color: var(--section-bg);
    margin: 10% auto;
    padding: 20px;
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    position: relative;
}

.modal h2 {
    color: var(--texts-color);
    margin-bottom: 15px;
    font-size: 18px;
}

.modal-body {
    color: var(--texts-color);
    line-height: 1.6;
    max-height: 60vh;
    overflow-y: auto;
    padding-right: 10px;
    margin-right: -10px;
}

/* 自定义滚动条样式 */
.modal-body::-webkit-scrollbar {
    width: 6px;
}

.modal-body::-webkit-scrollbar-track {
    background: var(--border-color);
    border-radius: 3px;
}

.modal-body::-webkit-scrollbar-thumb {
    background: var(--active-color);
    border-radius: 3px;
}

.modal-body::-webkit-scrollbar-thumb:hover {
    background: var(--texts-color);
}

.close {
    color: var(--texts-color);
    float: right;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: var(--active-color);
}

/* 可点击项样式 */
.clickable {
    cursor: pointer;
}

.clickable:hover {
    background-color: var(--hover-bg);
}