/**
 * Flavor Vlog - 企业级个人视频展示主题
 * 抖音风格 | 极简设计 | 流畅动画
 *
 * @package Flavor_Vlog
 * @version 2.0.0
 */

/* ========================================
   0. 全局样式重置
   ======================================== */
/* 隐藏WordPress管理栏 */
#wpadminbar {
    display: none !important;
}

html {
    margin-top: 0 !important;
}

body.admin-bar {
    margin-top: 0 !important;
}

/* ========================================
   1. CSS 变量系统 - 企业级设计规范
   ======================================== */
:root {
    /* 色彩系统 - 精心调配的色彩方案 */
    --color-primary: #FE2C55;
    --color-primary-light: #FF4D6D;
    --color-primary-dark: #E01E46;
    --color-secondary: #00F2EA;
    --color-secondary-light: #1FFEF5;
    --color-secondary-dark: #00C9C1;

    /* 背景色 - 深邃的层次感 */
    --color-bg: #000000;
    --color-bg-elevated: #0A0A0A;
    --color-bg-secondary: #121212;
    --color-bg-tertiary: #1E1E1E;
    --color-bg-quaternary: #2A2A2A;

    /* 文字色 - 清晰的层级 */
    --color-text: #FFFFFF;
    --color-text-secondary: #E5E5E5;
    --color-text-tertiary: #999999;
    --color-text-quaternary: #666666;

    /* 边框色 */
    --color-border: #2A2A2A;
    --color-border-light: #3A3A3A;
    --color-divider: rgba(255, 255, 255, 0.1);

    /* 叠加层 */
    --color-overlay: rgba(0, 0, 0, 0.6);
    --color-overlay-light: rgba(0, 0, 0, 0.4);
    --color-overlay-dark: rgba(0, 0, 0, 0.8);

    /* 渐变 - 品牌渐变 */
    --gradient-primary: linear-gradient(135deg, #FE2C55 0%, #FF006E 100%);
    --gradient-secondary: linear-gradient(135deg, #00F2EA 0%, #00D4FF 100%);
    --gradient-brand: linear-gradient(135deg, #FE2C55 0%, #FF006E 50%, #00F2EA 100%);
    --gradient-overlay: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.8) 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);

    /* 间距系统 - 8px 基准 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;

    /* 字体系统 */
    --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
                        'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue',
                        Helvetica, Arial, sans-serif;
    --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono',
                        Consolas, 'Courier New', monospace;

    /* 字号系统 */
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 30px;
    --font-size-4xl: 36px;

    /* 字重 */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* 行高 */
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* 圆角系统 */
    --radius-xs: 2px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;

    /* 阴影系统 - 精致的层次 */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 2px 4px 0 rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px 0 rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 16px 48px 0 rgba(0, 0, 0, 0.25);
    --shadow-2xl: 0 24px 64px 0 rgba(0, 0, 0, 0.3);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.1);

    /* 发光效果 */
    --glow-primary: 0 0 20px rgba(254, 44, 85, 0.4);
    --glow-secondary: 0 0 20px rgba(0, 242, 234, 0.4);

    /* 动画时长 */
    --duration-fast: 150ms;
    --duration-base: 250ms;
    --duration-slow: 350ms;
    --duration-slower: 500ms;

    /* 缓动函数 */
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* 过渡 */
    --transition-fast: var(--duration-fast) var(--ease-out);
    --transition-base: var(--duration-base) var(--ease-out);
    --transition-slow: var(--duration-slow) var(--ease-out);

    /* Z-index 层级 */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    --z-toast: 800;

    /* 底部安全距离 - 统一的跨设备兼容方案 */
    --bottom-nav-height: 60px; /* 底部导航栏固定高度 */
    --bottom-safe-area: env(safe-area-inset-bottom, 0px); /* 设备安全区域（iPhone 刘海屏等） */
    --bottom-base: calc(var(--bottom-nav-height) + var(--bottom-safe-area)); /* 统一基准：60px + 安全区域 */
}

/* ========================================
   2. 全局重置 - 现代化重置
   ======================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-text-size-adjust: 100%;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background: var(--color-bg);
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

/* 禁用选中 */
body.no-select {
    -webkit-user-select: none;
    user-select: none;
}

/* 链接 */
a {
    color: inherit;
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

a:active {
    opacity: 0.7;
}

/* 图片 */
img {
    max-width: 100%;
    height: auto;
    display: block;
    user-select: none;
    -webkit-user-drag: none;
}

/* 按钮 */
button {
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
    border: none;
    background: none;
    padding: 0;
    color: inherit;
    outline: none;
    user-select: none;
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

/* 输入框 */
input,
textarea {
    font-family: inherit;
    font-size: inherit;
    border: none;
    outline: none;
    background: none;
    color: inherit;
}

input::placeholder,
textarea::placeholder {
    color: var(--color-text-quaternary);
}

/* 列表 */
ul,
ol {
    list-style: none;
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-bg-quaternary);
    border-radius: var(--radius-full);
    transition: background var(--transition-base);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-quaternary);
}

/* ========================================
   3. 布局容器
   ======================================== */
/* 移动端默认 */
.app-container {
    position: relative;
    width: 100%;
    max-width: 100vw;
    min-height: 100vh;
    overflow: hidden;
    background: var(--color-bg);
}

/* PC 端强制移动端布局 - 白色两侧 */
@media (min-width: 768px) {
    body {
        display: flex;
        justify-content: center;
        align-items: flex-start;
        background: #ffffff; /* 白色背景 */
        min-height: 100vh;
    }

    .app-container {
        max-width: 480px !important; /* 限制最大宽度为移动端尺寸 */
        width: 480px !important;
        margin: 0 auto;
        box-shadow: 0 0 50px rgba(0, 0, 0, 0.15); /* 添加阴影效果 */
        position: relative;
    }

    /* 确保顶部导航栏宽度匹配 */
    .top-nav {
        left: auto;
        right: auto;
        width: 480px;
        margin: 0 auto;
    }

    /* 确保底部导航栏宽度匹配 */
    .bottom-nav {
        left: auto;
        right: auto;
        width: 480px;
        margin: 0 auto;
    }

    /* 确保进度条宽度匹配 */
    .video-progress {
        left: auto;
        right: auto;
        width: 480px;
        margin: 0 auto;
        margin-bottom: -6px;
    }

    /* 确保时间显示位置正确 */
    .video-time {
        left: 50%;
        transform: translateX(-50%);
    }
}

.main-content {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

/* ========================================
   4. 视频容器 - 全屏垂直滚动
   ======================================== */
.video-container {
    position: relative;
    width: 100%;
    height: calc(100vh - var(--bottom-nav-height)); /* 减去底部导航栏高度 */
    overflow-y: auto; /* 允许垂直滚动 */
    overflow-x: hidden;
    scroll-snap-type: y mandatory; /* 启用垂直滚动吸附 */
    -webkit-overflow-scrolling: touch; /* iOS平滑滚动 */
}

.video-container::-webkit-scrollbar {
    display: none;
}

/* 引导浮窗显示时禁止视频容器滚动和触摸 */
.video-container.no-scroll {
    overflow: hidden !important;
    touch-action: none !important;
    pointer-events: none; /* 禁止所有交互 */
    position: fixed; /* 固定位置，防止滚动 */
    top: 0;
    left: 0;
    right: 0;
}

/* 单个视频项 */
.video-item {
    position: relative;
    width: 100%;
    height: calc(100vh - var(--bottom-nav-height)); /* 减去底部导航栏高度 */
    scroll-snap-align: start; /* 滚动吸附到开始位置 */
    scroll-snap-stop: always; /* 强制停在每个视频项 */
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
}

/* ========================================
   5. 视频播放器 - 优雅的播放体验
   ======================================== */
.video-player {
    position: relative;
    width: 100%;
    height: 100%;
    background: var(--color-bg);
    overflow: hidden;
}

.video-player video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    background: var(--color-bg);
    position: relative;
    z-index: 0; /* 确保视频在最底层 */
}

/* 播放指示器 */
.video-play-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
    box-shadow: var(--shadow-xl);
}

.video-play-indicator.show {
    opacity: 1;
    /* 移除 pulse 动画，避免视觉重复 */
}

.video-play-indicator svg {
    width: 36px;
    height: 36px;
    fill: white;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}

/* 加载动画 */
.video-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 48px;
    height: 48px;
    display: none;
    z-index: var(--z-base);
}

.video-loading.show {
    display: block;
}

.video-loading::after {
    content: '';
    display: block;
    width: 100%;
    height: 100%;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--color-primary);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

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

/* 进度条 */
.video-progress {
    position: fixed; /* 固定定位，相对于视口 */
    bottom: var(--bottom-base); /* 统一基准：在底部导航栏上方（60px + 安全区域） */
    left: 0;
    right: 0;
    height: 3px; /* 更精细 */
    background: rgba(255, 255, 255, 0.15);
    z-index: 500;
    cursor: pointer;
    transition: opacity var(--transition-base), height var(--transition-fast);
    padding: 6px 0; /* 触摸区域padding */
    margin-bottom: -6px;
    opacity: 0; /* 默认隐藏 */
    pointer-events: auto; /* 确保可以接收事件 */
}

/* 激活状态（长按或拖动时显示） */
.video-progress.active {
    opacity: 1;
}

.video-progress:active,
.video-progress.dragging {
    height: 6px; /* 拖动时变粗 */
    opacity: 1;
}

.video-progress-bar {
    height: 100%;
    background: var(--gradient-primary);
    width: 0%;
    transition: none; /* 拖动时不要过渡，立即响应 */
    box-shadow: 0 0 8px rgba(254, 44, 85, 0.4);
    position: relative;
    pointer-events: none;
    border-radius: 2px;
}

.video-progress-bar::after {
    content: '';
    position: absolute;
    right: -5px;
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 12px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 0 1.5px var(--color-primary);
    opacity: 1;
    transition: all var(--transition-fast);
}

.video-progress:active .video-progress-bar::after,
.video-progress.dragging .video-progress-bar::after {
    transform: translateY(-50%) scale(1.2);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4), 0 0 0 2px var(--color-primary);
}

/* 进度条时间显示 */
.video-time {
    position: fixed; /* 固定定位，相对于视口 */
    bottom: calc(var(--bottom-base) + 12px); /* 统一基准 + 12px：在进度条上方 */
    left: 50%;
    transform: translateX(-50%);
    font-size: var(--font-size-sm);
    color: white;
    background: rgba(0, 0, 0, 0.8);
    padding: 6px 12px;
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    font-weight: var(--font-weight-semibold);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    z-index: 502; /* 比进度条更高 */
    pointer-events: none;
    opacity: 0; /* 默认隐藏 */
    transition: opacity var(--transition-base);
    white-space: nowrap;
}

.video-time.show {
    opacity: 1;
}

/* ========================================
   6. 视频信息叠加层 - 优雅的信息展示
   ======================================== */
.video-overlay {
    position: absolute; /* 相对于video-item定位 */
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    padding: var(--spacing-lg);
    padding-top: var(--spacing-lg); /* 视频详情页无顶部导航栏，减少顶部内边距 */
    padding-bottom: calc(var(--bottom-base) + 35px); /* 统一基准 + 35px：在进度条上方留出充足空间 */
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    pointer-events: none;
    z-index: var(--z-dropdown); /* 提升到 100，确保在视频上方 */
    background: linear-gradient(
        180deg,
        transparent 0%,
        transparent 60%,
        rgba(0,0,0,0.3) 80%,
        rgba(0,0,0,0.6) 100%
    );
    /* 确保不受滚动影响 */
    will-change: transform;
    transform: translateZ(0); /* 开启硬件加速 */
}

/* 有顶部导航栏的页面（首页等），增加顶部内边距 */
body:not(.single-flavor_video) .video-overlay {
    padding-top: calc(50px + var(--spacing-lg));
}

/* 强制隐藏视频详情页的顶部导航栏 */
body.single-flavor_video .top-nav {
    display: none !important;
}

.video-overlay > * {
    pointer-events: auto;
}

/* 视频信息 */
.video-info {
    flex-shrink: 0;
    padding-right: 80px;
    max-width: 100%;
}

/* 作者信息 */
.video-author {
    display: flex;
    align-items: center;
    gap: 12px; /* 优化：减少间距，更紧凑 */
    margin-bottom: var(--spacing-md);
}

.video-author-avatar {
    position: relative;
    width: 40px; /* 优化：缩小头像尺寸 */
    height: 40px;
    border-radius: var(--radius-full);
    border: 2px solid white;
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.video-author-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-author-info {
    flex: 1;
    min-width: 0;
}

.video-author-name {
    font-size: var(--font-size-sm); /* 优化：缩小字体尺寸 (14px) */
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    gap: 6px;
}

.video-location {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    font-size: 11px;
    font-weight: normal;
    color: var(--color-text-secondary);
    padding: 2px 6px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    backdrop-filter: blur(4px);
}

.video-location svg {
    width: 10px;
    height: 10px;
    opacity: 0.7;
}

.video-author-username {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

/* 视频描述 */
.video-description {
    font-size: var(--font-size-sm); /* 优化：缩小字体尺寸 (14px) */
    line-height: var(--line-height-normal);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    max-width: 100%;
}

.video-description.expanded {
    -webkit-line-clamp: unset;
}

/* 标签 */
.video-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px; /* 优化：减少标签间距 */
    margin-bottom: var(--spacing-sm);
}

.video-tag {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
    transition: color var(--transition-fast);
}

.video-tag:hover {
    color: var(--color-primary);
}

/* 音乐信息 */
.video-music {
    display: flex;
    align-items: center;
    gap: 6px; /* 优化：减少音乐信息间距 */
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
}

.video-music-icon {
    width: 16px;
    height: 16px;
    animation: rotate 3s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.video-music-text {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ========================================
   7. 右侧操作栏 - 简化为展示相关功能
   ======================================== */
.video-actions {
    position: absolute; /* 相对于video-item定位 */
    right: var(--spacing-md);
    bottom: calc(var(--bottom-base) + 32px); /* 统一基准 + 32px：在进度条上方，与信息层对齐 */
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px; /* 优化：减少按钮间距，更紧凑 */
    z-index: var(--z-dropdown); /* 提升到 100，确保在视频上方 */
    /* 确保不受滚动影响 */
    will-change: transform;
    transform: translateZ(0); /* 开启硬件加速 */
}

.action-btn {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    transition: transform var(--transition-base);
    cursor: pointer;
}

.action-btn:active {
    transform: scale(0.9);
}

.action-btn-icon {
    width: 44px; /* 优化：缩小图标容器尺寸 */
    height: 44px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
}

.action-btn:hover .action-btn-icon {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.action-btn-icon svg {
    width: 22px; /* 优化：缩小图标尺寸 */
    height: 22px;
    fill: white;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}

.action-btn-count {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
}

/* 点赞状态 */
.action-like.liked .action-btn-icon {
    background: rgba(254, 44, 85, 0.2);
}

.action-like.liked .action-btn-icon svg {
    fill: var(--color-primary);
}

/* 点赞动画 */
.action-like.like-animation .action-btn-icon {
    animation: likeHeart 0.6s ease;
}

@keyframes likeHeart {
    0% {
        transform: scale(1);
    }
    15% {
        transform: scale(1.3);
    }
    30% {
        transform: scale(0.95);
    }
    45% {
        transform: scale(1.1);
    }
    60% {
        transform: scale(0.98);
    }
    100% {
        transform: scale(1);
    }
}

/* 优化评论和播放图标 */
.action-comment .action-btn-icon svg,
.video-play-indicator svg {
    stroke-width: 2;
}

/* 作者头像旋转盘 */
.action-avatar {
    position: relative;
    width: 48px;
    height: 48px;
    margin-top: var(--spacing-md);
}

.action-avatar-img {
    width: 100%;
    height: 100%;
    border-radius: var(--radius-full);
    border: 2px solid white;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.action-avatar-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.action-avatar.playing {
    animation: rotate 3s linear infinite;
}

/* ========================================
   8. 顶部导航栏 - 现代设计
   ======================================== */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 50px;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    z-index: var(--z-fixed);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.top-nav-left,
.top-nav-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    min-width: 80px;
}

.top-nav-left {
    justify-content: flex-start;
}

.top-nav-right {
    justify-content: flex-end;
}

.top-nav-title {
    flex: 1;
    text-align: center;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.top-nav-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.top-nav-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.top-nav-btn:active {
    transform: scale(0.95);
}

.top-nav-btn svg {
    width: 20px;
    height: 20px;
    fill: white;
}

/* ========================================
   9. 底部导航栏 - 精致设计
   ======================================== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-nav-height); /* 使用统一变量：60px */
    padding-bottom: var(--bottom-safe-area); /* 适配刘海屏安全区域 */
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: space-around;
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-sm);
    z-index: var(--z-fixed);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.3);
}

.nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: var(--spacing-sm);
    transition: transform var(--transition-fast);
    position: relative;
}

.nav-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--color-text);
    transition: width var(--transition-base);
}

.nav-item.active::before {
    width: 20px;
}

.nav-item:active {
    transform: scale(0.95);
}

.nav-item-icon {
    width: 24px;
    height: 24px;
    position: relative;
}

.nav-item-icon svg {
    width: 100%;
    height: 100%;
    fill: var(--color-text-tertiary);
    transition: fill var(--transition-base);
}

.nav-item.active .nav-item-icon svg {
    fill: var(--color-text);
}

.nav-item-label {
    font-size: 10px;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-tertiary);
    transition: color var(--transition-base);
}

.nav-item.active .nav-item-label {
    color: var(--color-text);
    font-weight: var(--font-weight-semibold);
}

/* 上传按钮特殊样式 */
.nav-item.upload {
    transform: translateY(-8px);
    position: relative;
    cursor: pointer;
}

.nav-item.upload .nav-item-icon {
    width: 48px;
    height: 36px;
    background: var(--gradient-brand);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--glow-primary);
    transition: all var(--transition-base);
}

.nav-item.upload .nav-item-icon i {
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-base);
}

.nav-item.upload .nav-item-icon svg {
    fill: white;
    width: 20px;
    height: 20px;
}

/* 上传按钮激活状态 */
.nav-item.upload.active .nav-item-icon i {
    transform: rotate(45deg); /* 变成 X 号 */
}

/* 展开菜单容器 */
.upload-menu {
    position: absolute;
    bottom: calc(100% + 16px); /* 在按钮上方16px */
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: row; /* 横向布局 */
    gap: var(--spacing-lg); /* 增大间距 */
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-base),
                visibility var(--transition-base);
    z-index: var(--z-dropdown);
}

/* 菜单显示状态 */
.upload-menu.show {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

/* 单个菜单项 */
.upload-menu-item {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px; /* 固定宽度 */
    height: 56px; /* 固定高度，圆形 */
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-full); /* 圆形 */
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    transition: all var(--transition-base);
    transform: scale(0); /* 从中心缩放 */
    opacity: 0;
    pointer-events: auto; /* 确保可以接收点击事件 */
    position: relative; /* 建立层叠上下文 */
    z-index: 1; /* 确保在 overlay 之上 */
}

/* 菜单项显示动画 */
.upload-menu.show .upload-menu-item {
    transform: scale(1);
    opacity: 1;
}

/* 延迟动画 - 从中间向两边展开 */
.upload-menu.show .upload-menu-item:nth-child(1) {
    transition-delay: 50ms;
}

.upload-menu.show .upload-menu-item:nth-child(2) {
    transition-delay: 100ms;
}

/* 菜单项悬停 */
.upload-menu-item:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.25);
}

.upload-menu-item:active {
    transform: scale(0.95);
}

/* 菜单图标 */
.upload-menu-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    background: var(--gradient-brand);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.upload-menu-icon svg {
    width: 18px;
    height: 18px;
    fill: white;
}

/* 遮罩层 */
.upload-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: transparent;
    z-index: calc(var(--z-dropdown) - 2); /* 降低到 98，避免遮挡菜单 */
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-base),
                visibility var(--transition-base);
}

.upload-overlay.show {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

/* ========================================
   10. 响应式设计
   ======================================== */
/* 已在上面统一处理，此处保留占位 */

/* ========================================
   11. 工具类
   ======================================== */
.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.no-scroll {
    overflow: hidden;
    position: fixed;
    width: 100%;
    height: 100%;
}

.text-gradient {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 毛玻璃效果 */
.glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.glass-dark {
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

/* ========================================
   12. Toast 提示消息
   ======================================== */
.toast {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: var(--color-text);
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    box-shadow: var(--shadow-xl);
    z-index: var(--z-toast);
    opacity: 0;
    transition: opacity var(--transition-base);
    max-width: 80%;
    text-align: center;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
}

.toast.success {
    background: rgba(76, 175, 80, 0.9);
}

.toast.error {
    background: rgba(244, 67, 54, 0.9);
}

.toast.info {
    background: rgba(0, 0, 0, 0.85);
}

.toast.warning {
    background: rgba(255, 152, 0, 0.9);
}

/* ========================================
   13. 开始引导层
   ======================================== */
.start-guide {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    cursor: pointer;
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.start-guide-content {
    text-align: center;
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.start-guide-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--glow-primary);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: var(--glow-primary);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 30px rgba(254, 44, 85, 0.6);
    }
}

.start-guide-icon svg {
    width: 36px;
    height: 36px;
    fill: white;
    margin-left: 4px; /* 播放图标视觉居中 */
}

.start-guide-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.start-guide-hint {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    opacity: 0.8;
}

/* 点击时的反馈 */
.start-guide:active .start-guide-icon {
    transform: scale(0.95);
}

/* ========================================
   14. 引导浮窗（首次访问提示 - 透明层）
   ======================================== */
.guide-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: transparent; /* 完全透明背景 */
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-base) var(--ease-out),
                visibility 0s linear var(--duration-base);
    pointer-events: none; /* 默认不拦截点击 */
}

.guide-overlay.show {
    opacity: 1;
    visibility: visible;
    transition: opacity var(--duration-base) var(--ease-out);
    pointer-events: auto; /* 显示时可点击 */
}

.guide-content {
    text-align: center;
    padding: var(--spacing-2xl);
    background: rgba(255, 255, 255, 0.95); /* 白色半透明背景 */
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-2xl);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    animation: guideFloat 1.5s ease-in-out infinite;
}

@keyframes guideFloat {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-8px);
    }
}

.guide-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: rgba(0, 0, 0, 0.08);
}

.guide-icon svg {
    width: 48px;
    height: 48px;
    stroke: #000000; /* 黑色箭头 */
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
    animation: guideArrow 1.5s ease-in-out infinite;
}

@keyframes guideArrow {
    0%, 100% {
        transform: translateY(0);
        opacity: 1;
    }
    50% {
        transform: translateY(8px);
        opacity: 0.6;
    }
}

.guide-text {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: #000000; /* 黑色文字 */
    margin-bottom: var(--spacing-md);
    text-shadow: none;
}

.guide-hint {
    font-size: var(--font-size-base);
    color: #666666; /* 深灰色提示文字 */
    opacity: 0.8;
    animation: guideHintBlink 2s ease-in-out infinite;
}

@keyframes guideHintBlink {
    0%, 100% {
        opacity: 0.8;
    }
    50% {
        opacity: 0.4;
    }
}

/* ========================================
   15. 登录浮窗 - 抖音风格
   ======================================== */
.login-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.login-modal.show {
    display: flex;
    opacity: 1;
}

.login-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.login-modal-content {
    position: relative;
    width: 90%;
    max-width: 420px;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-3xl) var(--spacing-2xl);
    box-shadow: var(--shadow-2xl);
    animation: loginSlideUp 0.4s var(--ease-out);
    max-height: 90vh;
    overflow-y: auto;
}

@keyframes loginSlideUp {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.login-modal-close {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--color-bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.login-modal-close:hover {
    background: var(--color-bg-quaternary);
    transform: rotate(90deg);
}

.login-modal-close svg {
    width: 20px;
    height: 20px;
    fill: var(--color-text-secondary);
}

.login-modal-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.login-modal-logo {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-lg);
    background: var(--gradient-brand);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--glow-primary);
    animation: loginLogoPulse 2s ease-in-out infinite;
}

@keyframes loginLogoPulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: var(--glow-primary);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 30px rgba(254, 44, 85, 0.6);
    }
}

.login-modal-logo svg {
    width: 32px;
    height: 32px;
    fill: white;
}

.login-modal-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.login-modal-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.login-form-group {
    margin-bottom: var(--spacing-lg);
}

.login-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.login-input-icon {
    position: absolute;
    left: var(--spacing-md);
    width: 20px;
    height: 20px;
    fill: var(--color-text-quaternary);
    pointer-events: none;
}

.login-input {
    width: 100%;
    height: 52px;
    padding: 0 var(--spacing-md) 0 calc(var(--spacing-md) + 20px + var(--spacing-md));
    background: var(--color-bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    color: var(--color-text);
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
}

.login-input:focus {
    background: var(--color-bg-elevated);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(254, 44, 85, 0.1);
}

.login-input::placeholder {
    color: var(--color-text-quaternary);
}

.login-toggle-password {
    position: absolute;
    right: var(--spacing-md);
    width: 24px;
    height: 24px;
    padding: 0;
    background: none;
    border: none;
}

.login-toggle-password svg {
    width: 100%;
    height: 100%;
    fill: var(--color-text-quaternary);
    transition: fill var(--transition-base);
}

.login-toggle-password:hover svg {
    fill: var(--color-text-secondary);
}

.login-form-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
}

.login-checkbox {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.login-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-right: var(--spacing-sm);
    cursor: pointer;
    accent-color: var(--color-primary);
}

.login-checkbox-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.login-forgot {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    text-decoration: none;
    transition: opacity var(--transition-base);
}

.login-forgot:hover {
    opacity: 0.8;
}

.login-submit-btn {
    width: 100%;
    height: 52px;
    background: var(--gradient-brand);
    border: none;
    border-radius: var(--radius-lg);
    color: white;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    box-shadow: var(--glow-primary);
    transition: all var(--transition-base);
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(254, 44, 85, 0.4);
}

.login-submit-btn:active {
    transform: translateY(0);
}

.login-submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.login-spinner {
    width: 20px;
    height: 20px;
    animation: loginSpin 1s linear infinite;
}

.login-spinner circle {
    stroke-dasharray: 80;
    stroke-dashoffset: 60;
}

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

.login-divider {
    position: relative;
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--color-border);
}

.login-divider span {
    position: relative;
    display: inline-block;
    padding: 0 var(--spacing-md);
    background: var(--color-bg-secondary);
    color: var(--color-text-tertiary);
    font-size: var(--font-size-sm);
}

.login-social {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.login-social-btn {
    flex: 1;
    height: 48px;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-base);
}

.login-social-btn:hover {
    background: var(--color-bg-quaternary);
    border-color: var(--color-primary);
    color: var(--color-text);
}

.login-social-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.login-footer-text {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.login-register-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: var(--font-weight-semibold);
    transition: opacity var(--transition-base);
}

.login-register-link:hover {
    opacity: 0.8;
}

/* PC端适配 */
@media (min-width: 768px) {
    .login-modal-content {
        max-width: 480px;
    }

    /* 确保浮窗在移动端容器内 */
    .login-modal {
        width: 480px;
        left: 50%;
        right: auto;
        transform: translateX(-50%);
    }

    /* 上传菜单在PC端也要居中 */
    .upload-menu {
        left: 50%;
        transform: translateX(-50%);
    }

    /* Toast提示在PC端也要居中 */
    .toast {
        left: 50%;
        transform: translate(-50%, -50%);
    }

    /* 引导浮窗PC端居中 */
    .guide-overlay,
    .start-guide {
        width: 480px;
        left: 50%;
        right: auto;
        transform: translateX(-50%);
    }

    /* 评论面板PC端适配 */
    .comments-panel {
        width: 480px;
        left: 50%;
        right: auto;
        transform: translateX(-50%);
    }
}