/* ============================================================
   奶蛙宇宙门户样式
   主题通过 html[data-theme] 切换, 全部颜色收在 CSS 变量内
   ============================================================ */

/* ---------- 主题定义 ---------- */
:root,
html[data-theme="light"] {
  --bg: #f6f8f7;
  --bg-soft: #eef2f0;
  --panel: #ffffff;
  --card: #ffffff;
  --text: #24312c;
  --text-dim: #6b7a74;
  --accent: #3aa675;
  --accent-soft: #dff0e8;
  --border: #dde5e1;
  --shadow: 0 2px 10px rgba(36, 49, 44, 0.08);
}
html[data-theme="dark"] {
  --bg: #17201c;
  --bg-soft: #1e2925;
  --panel: #1c2622;
  --card: #1f2b26;
  --text: #e3ece8;
  --text-dim: #8fa39b;
  --accent: #4cbd8a;
  --accent-soft: #24382f;
  --border: #2c3a34;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.35);
}
html[data-theme="sky"] {
  --bg: #eef4fa;
  --bg-soft: #e2edf7;
  --panel: #ffffff;
  --card: #ffffff;
  --text: #1f2d3d;
  --text-dim: #5f7589;
  --accent: #2f7fc1;
  --accent-soft: #d9e9f8;
  --border: #d3e0ec;
  --shadow: 0 2px 10px rgba(31, 45, 61, 0.08);
}
html[data-theme="pink"] {
  --bg: #faf0f3;
  --bg-soft: #f6e4ea;
  --panel: #ffffff;
  --card: #ffffff;
  --text: #3c2530;
  --text-dim: #8a6b77;
  --accent: #d4678a;
  --accent-soft: #f8dde6;
  --border: #ecd4dd;
  --shadow: 0 2px 10px rgba(60, 37, 48, 0.08);
}
html[data-theme="purple"] {
  --bg: #f1eff8;
  --bg-soft: #e7e3f4;
  --panel: #ffffff;
  --card: #ffffff;
  --text: #2a2440;
  --text-dim: #6f6690;
  --accent: #6d5bb8;
  --accent-soft: #e2dcf5;
  --border: #d8d2ec;
  --shadow: 0 2px 10px rgba(42, 36, 64, 0.08);
}
html[data-theme="green"] {
  --bg: #eff5ec;
  --bg-soft: #e2eedd;
  --panel: #ffffff;
  --card: #ffffff;
  --text: #22301f;
  --text-dim: #64755e;
  --accent: #4f8a3d;
  --accent-soft: #ddeed5;
  --border: #d2e2cb;
  --shadow: 0 2px 10px rgba(34, 48, 31, 0.08);
}

/* ---------- 基础 ---------- */
* { box-sizing: border-box; }
/* hidden 属性必须压过任何 display 声明, 否则隐藏层仍拦截交互 */
[hidden] { display: none !important; }
html { scrollbar-width: none; }
html::-webkit-scrollbar { display: none; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
button {
  font-family: inherit;
  border: none;
  cursor: pointer;
  background: none;
  color: inherit;
}
img { display: block; }

/* ---------- 顶部导航 ---------- */
.top-bar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 18px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}
.brand-icon { width: 28px; height: 28px; border-radius: 6px; }
.brand-name { font-size: 18px; font-weight: 700; color: var(--accent); }
.tab-nav {
  display: flex;
  gap: 4px;
  flex: 1;
  justify-content: center;
  flex-wrap: wrap;
}
.tab-btn {
  padding: 6px 16px;
  border-radius: 18px;
  font-size: 15px;
  color: var(--text-dim);
  transition: background 0.15s, color 0.15s;
}
.tab-btn:hover { background: var(--accent-soft); color: var(--accent); }
.tab-btn.active { background: var(--accent); color: #fff; }
.tab-btn.disabled { opacity: 0.4; cursor: not-allowed; }
.settings-toggle {
  font-size: 20px;
  padding: 4px 8px;
  border-radius: 8px;
  color: var(--text-dim);
}
.settings-toggle:hover { background: var(--accent-soft); color: var(--accent); }

/* ---------- 面包屑 ---------- */
.crumb-bar {
  padding: 10px 18px 0;
  font-size: 14px;
  color: var(--text-dim);
}
.crumb-link { color: var(--accent); font-size: 14px; }
.crumb-link:hover { text-decoration: underline; }
.crumb-sep { margin: 0 6px; }
.crumb-type, .crumb-album { color: var(--text); }

/* ---------- 公告栏 ---------- */
.notice-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 10px 18px 0;
  padding: 8px 14px;
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
}
.notice-text { flex: 1; }
.notice-close { font-size: 18px; color: var(--text-dim); }

/* ---------- 主内容 ---------- */
.main-content { flex: 1; padding: 16px 18px 30px; }
.view-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-dim);
}
.view-empty-hint { font-size: 13px; }

/* ---------- 首页导航 ---------- */
.type-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}
.type-btn {
  padding: 6px 18px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--panel);
  font-size: 15px;
  color: var(--text-dim);
  transition: all 0.15s;
}
.type-btn:hover { border-color: var(--accent); color: var(--accent); }
.type-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.album-nav {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 14px;
}
.album-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform 0.15s, border-color 0.15s;
}
.album-card:hover { transform: translateY(-3px); border-color: var(--accent); }
.album-name { font-size: 16px; font-weight: 600; margin: 0 0 6px; }
.album-count { font-size: 13px; color: var(--text-dim); margin: 0; }

/* ---------- 媒体网格 ----------
   采用列容器式 masonry: 外层横向 flex, 内部按当前列数维护等宽纵列, 卡片由 JS
   轮询追加到各列。不用 CSS Grid 的原因: 网格的行轨道按该行最高卡片取值, 原始
   比例模式下卡片高度随素材比例变化, 矮卡片会被拉高, 多余空间堆在操作栏下方
   形成大片空洞(实测可达 200px 以上)。列式布局天然贴合卡片高度, 与参考实现的
   结构口径一致 */
.grid-container {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.masonry-col {
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex: 1 1 0;
  min-width: 0;
}
.media-card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}
.media-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(36, 49, 44, 0.14);
  border-color: var(--accent);
}

.card-media-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: var(--ratio, 1 / 1);
  background: var(--bg-soft);
  overflow: hidden;
  cursor: zoom-in;
  transition: background-color 0.2s;
}
/* 原始比例图片: 加载完成前保持正方形占位, 加载后由媒体自身撑开高度
   此处必须与参考实现一致, 不能无条件 aspect-ratio: auto, 否则音频等
   无内在尺寸的媒体(其元素不参与文档流或尺寸为 0)会让卡片高度塌陷 */
.card-media-wrap.ratio-original.media-loaded { aspect-ratio: auto; height: auto; }

/* 图片填充: 固定比例与原始比例是两条互斥规则, 各自写全全部属性。
   此处刻意照搬参考实现的结构 —— 不用"基类 + 部分覆盖"的写法, 因为覆盖规则
   一旦漏写某个属性(例如 object-fit), 固定模式的 cover 会残留到原始比例模式,
   媒体仍被裁切, 表现为卡片高度正确但画面被切掉一截 */
.media-thumb {
  width: 100%;
  display: block;
}
/* 固定比例模式: 铺满并由容器居中裁切 */
.card-media-wrap:not(.ratio-original) .media-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}
/* 原始比例模式: 按宽度撑满, 高度由图片自身比例决定, 不裁切 */
.card-media-wrap.ratio-original .media-thumb {
  width: 100%;
  height: auto;
  object-fit: fill;
  display: block;
}

/* 图片懒加载: 未就绪时透明, 加载完成后淡入, 避免半成品一闪而过 */
.card-media.loading { opacity: 0; }
.card-media.loaded { opacity: 1; transition: opacity 0.4s ease; }

/* 骨架屏: 媒体尚未就绪时以流光占位, 替代空白区域 */
.card-media-wrap:not(.media-loaded):not(.thumb-failed)::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--bg-soft) 25%, var(--panel) 50%, var(--bg-soft) 75%);
  background-size: 200% 100%;
  animation: cardShimmer 1.5s ease-in-out infinite;
  z-index: 0;
}
@keyframes cardShimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* 视频铺满卡片; 音频无视觉内容, 由 wrap 的比例盒承载播放控件与装饰 */
/* 视频同样分互斥两种模式, 与图片保持一致的填充口径 */
.media-video {
  width: 100%;
  display: block;
  background: #000;
}
.card-media-wrap:not(.ratio-original) .media-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}
.card-media-wrap.ratio-original .media-video {
  width: 100%;
  height: auto;
  display: block;
}
.media-card video.media-thumb,
.media-card audio.media-thumb { cursor: pointer; }
/* 音频元素保留在文档流内(不可绝对定位), 否则 wrap 失去内在尺寸来源;
   用 0 高度 + 隐藏控件的方式让它只提供媒体能力而不占版面 */
.audio-el {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  pointer-events: none;
}
/* 音频元素不可绝对定位会撑破比例盒, 因此改为让其脱离布局但由 JS 保证 wrap 有高度;
   实际做法与参考实现一致: wrap 始终有 aspect-ratio 兜底, 音频只作为能力载体 */
.card-media-wrap:has(.audio-el) {
  aspect-ratio: 1 / 1;
  background: var(--accent-soft);
}
.card-media-wrap:has(.audio-el)::after {
  content: '\266B';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 44px;
  color: var(--accent);
  opacity: 0.45;
  z-index: 1;
  pointer-events: none;
}

/* 视频音频卡片的中心播放遮罩 */
.card-play-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: #fff;
  background: rgba(0, 0, 0, 0.45);
  border-radius: 50%;
  cursor: pointer;
  z-index: 3;
  transition: all 0.15s;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.card-play-overlay:hover {
  background: rgba(0, 0, 0, 0.65);
  transform: translate(-50%, -50%) scale(1.1);
}
/* 音频卡片无画面, 播放按钮居中偏上, 给底部控制栏留出空间 */
.card-media-wrap:has(.audio-el) .card-play-overlay { top: 40%; }

/* 视频音频卡片的底部播放控制栏, 悬停或播放中显示 */
.card-player-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 8px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
  opacity: 0;
  transition: opacity 0.15s;
  pointer-events: none;
}
.card-media-wrap:hover .card-player-bar,
.card-player-bar.visible { opacity: 1; pointer-events: auto; }
.card-ctrl-play,
.card-ctrl-mute {
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: #fff;
  background: none;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
  border-radius: 4px;
  transition: background 0.15s;
}
.card-ctrl-play:hover,
.card-ctrl-mute:hover { background: rgba(255, 255, 255, 0.15); }
.card-ctrl-progress-wrap {
  flex: 1;
  height: 4px;
  background: rgba(255, 255, 255, 0.25);
  border-radius: 2px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: height 0.15s;
}
.card-ctrl-progress-wrap:hover { height: 6px; }
.card-ctrl-buffered {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0;
  background: rgba(255, 255, 255, 0.25);
  border-radius: 2px;
  pointer-events: none;
}
.card-ctrl-progress {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0;
  background: var(--accent);
  border-radius: 2px;
  pointer-events: none;
  z-index: 1;
}
.card-ctrl-time {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.85);
  white-space: nowrap;
  min-width: 58px;
  text-align: center;
  flex-shrink: 0;
}

/* ---------- 卡片操作栏 ----------
   结构与参考实现一致: 紧贴卡片底部、与媒体区域分离的一行按钮, 每个按钮
   纵向排布图标与计数。浏览为只读展示, 其余按钮分别触发点赞/收藏/全屏/分享 */
.control-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 6px 8px;
  background: var(--card);
  border-top: 1px solid var(--border);
}
.ctrl-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1px;
  min-width: 0;
  flex: 1 1 0;
  padding: 4px 2px;
  font-size: 14px;
  color: var(--text-dim);
  background: none;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
  overflow: hidden;
}
.ctrl-btn:hover {
  background: var(--bg-soft);
  color: var(--text);
}
/* 浏览计数为只读展示, 不接受点击反馈 */
.ctrl-btn-static { cursor: default; opacity: 0.6; }
.ctrl-btn-static:hover { background: none; color: var(--text-dim); }
.ctrl-btn .ctrl-icon { font-size: 16px; line-height: 1; }
.ctrl-btn .ctrl-count { font-size: 10px; line-height: 1; color: var(--text-dim); }
.ctrl-btn.active-like {
  color: var(--accent);
  animation: pulseLike 0.3s ease-out;
}
@keyframes pulseLike {
  0% { transform: scale(1); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}
.ctrl-btn.active-fav {
  color: #f0a020;
  animation: pulseFav 0.3s ease-out;
}
@keyframes pulseFav {
  0% { transform: scale(1); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

/* 素材缺失或读取失败时的占位提示, 同时禁用卡片交互 */
.card-media-wrap.thumb-failed .media-thumb { display: none; }
/* 失败占位改为铺满居中: 基类已无 flex 居中, 这里用绝对定位自行居中 */
.card-media-wrap.thumb-failed::before {
  content: '素材加载失败';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  animation: none;
  color: var(--text-dim);
  font-size: 13px;
  z-index: 2;
  text-align: center;
  padding: 0 8px;
}
/* 失败态下隐藏音频音符标记, 避免与失败提示重叠 */
.card-media-wrap.thumb-failed:has(.audio-el) { background: var(--bg-soft); }
.card-media-wrap.thumb-failed:has(.audio-el)::after { content: none; }
/* 禁用态沿用参考实现的视觉语言: 整体降透明与去色, 并隐藏播放控件 */
.media-card.card-disabled { cursor: not-allowed; opacity: 0.5; }
.media-card.card-disabled .card-media-wrap { cursor: not-allowed; filter: grayscale(0.9); }
.media-card.card-disabled .card-play-overlay,
.media-card.card-disabled .card-player-bar { display: none; }

/* ---------- 收藏视图操作栏 ---------- */
.favorites-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  margin-bottom: 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.favorites-count { font-size: 14px; color: var(--text-dim); }
.clear-btn {
  padding: 5px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  font-size: 13px;
  color: var(--text-dim);
}
.clear-btn:hover { border-color: #d98c8c; color: #c66; }
.clear-btn.confirming {
  background: #c66;
  border-color: #c66;
  color: #fff;
}

/* ---------- 热门排名角标 ---------- */
.media-rank {
  position: absolute;
  top: 8px;
  left: 8px;
  min-width: 24px;
  height: 24px;
  padding: 0 6px;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  line-height: 24px;
  text-align: center;
  z-index: 3;
}

/* ---------- 到底提示 ---------- */
.no-more { text-align: center; padding: 20px; color: var(--text-dim); font-size: 13px; }

/* ---------- 关于页 ---------- */
.view-about { max-width: 720px; margin: 0 auto; }
.about-title { font-size: 22px; border-bottom: 2px solid var(--accent); padding-bottom: 8px; }
.about-lead { color: var(--text-dim); }
.about-subtitle { font-size: 17px; margin-top: 26px; }
.about-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
.about-table th, .about-table td {
  border-bottom: 1px solid var(--border);
  padding: 10px 14px;
  font-size: 14px;
  text-align: center;
}
.about-table th { background: var(--bg-soft); color: var(--text-dim); font-weight: 600; width: 30%; }
.about-table tr:last-child th, .about-table tr:last-child td { border-bottom: none; }
.about-list { color: var(--text-dim); padding-left: 20px; }
.about-repo a { color: var(--accent); }
.about-note { color: var(--text-dim); font-size: 13px; }

/* ---------- 页脚 ---------- */
.site-footer {
  padding: 16px;
  text-align: center;
  font-size: 13px;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  background: var(--panel);
}
.site-footer a { color: var(--accent); text-decoration: none; }

/* ---------- 回到顶部 ---------- */
.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 26px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 16px;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
  z-index: 40;
}
.back-to-top.show { opacity: 1; pointer-events: auto; }

/* ---------- 全屏查看 ---------- */
.fullscreen-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(10, 14, 12, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
}
.fullscreen-close {
  position: absolute;
  top: 14px;
  right: 18px;
  font-size: 34px;
  color: #fff;
  z-index: 102;
}
.fullscreen-controls {
  position: absolute;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 102;
}
.fs-ctrl-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 16px;
}
.fs-ctrl-btn:hover { background: rgba(255, 255, 255, 0.3); }
/* 媒体层铺满视口并居中, 缩放后的拖拽平移在层内裁切 */
.fullscreen-media-wrap {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.fullscreen-media {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}
.fullscreen-media > img {
  max-width: 92vw;
  max-height: 86vh;
  transform-origin: center center;
  transition: transform 0.15s ease;
  cursor: grab;
}
.fullscreen-media > img.grabbing {
  cursor: grabbing;
  transition: none;
}
.fullscreen-media > video {
  max-width: 92vw;
  max-height: 86vh;
  background: #000;
}
.fullscreen-media > audio {
  width: min(560px, 86vw);
}
.fullscreen-caption {
  position: absolute;
  bottom: 16px;
  left: 0;
  right: 0;
  text-align: center;
  color: rgba(255, 255, 255, 0.85);
  font-size: 14px;
  z-index: 101;
}

/* ---------- 设置面板 ---------- */
.settings-panel {
  position: fixed;
  top: 60px;
  right: 14px;
  z-index: 90;
  width: 300px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
.settings-title { font-weight: 600; }
.settings-close { font-size: 24px; color: var(--text-dim); }
.settings-body { padding: 14px 16px; }
.settings-section { margin-bottom: 16px; }
.settings-section:last-child { margin-bottom: 0; }
.settings-label { font-size: 13px; color: var(--text-dim); margin-bottom: 8px; }
.col-switch, .ratio-switch { display: flex; flex-wrap: wrap; gap: 6px; }
.col-btn, .ratio-btn {
  min-width: 36px;
  padding: 5px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  font-size: 13px;
  color: var(--text-dim);
}
.col-btn.active, .ratio-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
/* 窄屏下超出列数范围的选项置灰不可用 */
.col-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.settings-select {
  width: 100%;
  padding: 7px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text);
  font-size: 14px;
  text-align: center;
  text-align-last: center;
}

/* ---------- 首次访问引导 ---------- */
.guide-layer {
  position: fixed;
  inset: 0;
  z-index: 120;
  background: rgba(10, 14, 12, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
}
.guide-card {
  width: min(420px, 88vw);
  background: var(--panel);
  border-radius: 14px;
  padding: 26px 28px;
  box-shadow: var(--shadow);
}
.guide-title { font-size: 19px; font-weight: 700; margin-bottom: 14px; color: var(--accent); }
.guide-list { color: var(--text-dim); padding-left: 20px; margin: 0 0 18px; }
.guide-btn {
  width: 100%;
  padding: 9px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
}
.guide-btn:hover { filter: brightness(1.08); }

/* ---------- 飘窗提醒 ---------- */
.toast-container {
  position: fixed;
  top: 66px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 150;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  pointer-events: none;
}
.toast {
  padding: 9px 20px;
  border-radius: 10px;
  background: var(--panel);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  color: var(--text);
  font-size: 14px;
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 0.25s, transform 0.25s;
  pointer-events: auto;
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast.warn { border-color: #e0b04c; }
.toast.degrade { border-color: #d98c8c; }

/* ---------- SEO 语义结构 ----------
   站点级 h1 与各视图 h2 用于建立标题层级: h1 视觉隐藏, h2 作为视图小标题显示 */
.seo-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}
.view-heading {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dim);
  margin: 0 0 12px;
}

/* ---------- 移动端适配 ---------- */
@media (max-width: 767px) {
  .top-bar { flex-wrap: wrap; gap: 8px; padding: 8px 12px; }
  .brand-name { font-size: 16px; }
  .tab-nav { order: 3; width: 100%; justify-content: space-around; }
  .main-content { padding: 12px 10px 24px; }
  .grid-container { gap: 10px; }
  .masonry-col { gap: 10px; }
  .album-nav { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
  .notice-bar { margin: 8px 10px 0; }
  .crumb-bar { padding: 8px 12px 0; }
  .card-play-overlay { width: 44px; height: 44px; font-size: 17px; }
  .card-player-bar { gap: 4px; padding: 4px 6px; }
  .card-ctrl-time { font-size: 10px; min-width: 46px; }
  .card-ctrl-progress-wrap { height: 3px; }
}
@media (max-width: 480px) {
  .card-ctrl-time { min-width: 40px; }
}