/* ============================================
   Layout — 页面整体骨架
   ============================================ */

.page-wrapper {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--gap-lg);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ---- 顶部导航 ---- */
.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--gap-md) 0;
  height: 64px;
}

.top-nav__logo {
  font-size: 24px;
  font-weight: bold;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
}

.top-nav__logo img {
  height: 32px;
  vertical-align: middle;
}

.top-nav__links {
  display: flex;
  gap: var(--gap-xl);
}

/* ---- Hero 区块（图片 + 弹幕 | 音乐播放器）---- */
.hero-section {
  display: flex;
  gap: var(--gap-lg);
  margin-top: var(--gap-lg);
}

.hero-left {
  flex: 1;
  display: flex;
  gap: var(--gap-md);
  min-width: 0;
}

.hero-image-area {
  width: 280px;
  flex-shrink: 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
}

.hero-image-area img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-image-area__placeholder {
  text-align: center;
  color: var(--text-light);
  font-size: 14px;
}

.hero-image-area__placeholder-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--gap-sm);
  opacity: 0.3;
}

.hero-card {
  flex: 1;
  min-width: 0;
}

.hero-card--music {
  flex: 1;
  min-width: 0;
}

/* ---- 歌词滚动条（Hero 区块正下方）---- */
.lyrics-bar-wrapper {
  margin-top: var(--gap-lg);
}

/* ---- 主内容三栏 ---- */
.main-content {
  display: flex;
  gap: var(--gap-lg);
  margin-top: var(--gap-lg);
  flex: 1;
}

/* 左侧分类标签 */
.sidebar-left {
  width: 72px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
  padding-top: var(--gap-md);
}

/* 中间主内容 */
.content-center {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--gap-lg);
}

/* 右侧栏 */
.sidebar-right {
  width: 360px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: var(--gap-lg);
}

/* ---- 页脚 ---- */
.page-footer {
  padding: var(--gap-lg) 0;
  text-align: center;
  font-size: 13px;
  color: var(--text-light);
  margin-top: var(--gap-xl);
}

.page-footer__icp {
  margin-top: var(--gap-xs);
}

/* ---- 深色模式切换按钮 ---- */
.theme-toggle {
  position: fixed;
  bottom: var(--gap-lg);
  right: var(--gap-lg);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--bg-card);
  box-shadow: var(--shadow-card);
  font-size: 20px;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast),
              transform var(--transition-fast);
}

.theme-toggle:hover {
  transform: scale(1.1);
}

.theme-toggle:active {
  transform: scale(0.95);
}