/* ============================================
   2026 热门歌手演唱会曲目参考网站 - 公共样式
   ============================================ */

/* ---------- 1. CSS 变量定义 ---------- */
:root {
  /* 主色调 */
  --color-primary: #1E40AF;
  --color-primary-hover: #1D3A9A;
  --color-primary-light: #3B5FCC;
  --color-primary-bg: rgba(30, 64, 175, 0.08);

  /* 辅助色 */
  --color-accent: #F97316;
  --color-accent-hover: #EA6A10;
  --color-accent-light: rgba(249, 115, 22, 0.12);

  /* 中性色 */
  --color-white: #FFFFFF;
  --color-light-gray: #F3F4F6;
  --color-medium-gray: #E5E7EB;
  --color-dark-gray: #374151;
  --color-text-primary: #111827;
  --color-text-secondary: #6B7280;
  --color-text-muted: #9CA3AF;

  /* 禁用色 */
  --color-disabled: #9CA3AF;
  --color-disabled-bg: #F3F4F6;

  /* 字体 */
  --font-family: "微软雅黑", "思源黑体", "Source Han Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  /* 字号 */
  --font-size-h1: 24px;
  --font-size-h2: 20px;
  --font-size-h3: 18px;
  --font-size-h4: 16px;
  --font-size-body: 15px;
  --font-size-body-sm: 14px;
  --font-size-caption: 13px;
  --font-size-small: 12px;

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

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 20px;
  --radius-full: 9999px;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 8px 24px rgba(0, 0, 0, 0.15);

  /* 过渡 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.35s ease;

  /* 布局 */
  --container-max-width: 1200px;
  --sidebar-width: 300px;
  --nav-height: 60px;
  --mobile-nav-height: 56px;
}

/* ---------- 2. 全局重置样式 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-light-gray);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  padding-bottom: var(--mobile-nav-height);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
}

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  border: none;
  outline: none;
  background: none;
}

button {
  cursor: pointer;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text-primary);
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }

p {
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
}

/* ---------- 3. 导航栏样式 ---------- */

/* 顶部导航栏 - 电脑端 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background-color: var(--color-primary);
  color: var(--color-white);
  z-index: 1000;
  box-shadow: var(--shadow-md);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  white-space: nowrap;
}

.navbar-logo:hover {
  color: var(--color-white);
  opacity: 0.9;
}

.navbar-logo .logo-icon {
  width: 32px;
  height: 32px;
  background-color: var(--color-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.navbar-menu a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  color: rgba(255, 255, 255, 0.85);
  font-size: var(--font-size-body-sm);
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.navbar-menu a:hover,
.navbar-menu a.active {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.15);
}

.navbar-menu a.active {
  background-color: rgba(255, 255, 255, 0.2);
}

.navbar-search-toggle {
  display: none;
}

/* 底部导航栏 - 手机端 */
.mobile-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--mobile-nav-height);
  background-color: var(--color-white);
  border-top: 1px solid var(--color-medium-gray);
  z-index: 1000;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.06);
}

.mobile-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-around;
  height: 100%;
  max-width: 500px;
  margin: 0 auto;
}

.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  flex: 1;
  padding: 6px 0;
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

.mobile-nav-item .nav-icon {
  font-size: 22px;
  line-height: 1;
}

.mobile-nav-item:hover,
.mobile-nav-item.active {
  color: var(--color-primary);
}

.mobile-nav-item.active::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 3px;
  background-color: var(--color-primary);
  border-radius: 0 0 3px 3px;
}

/* ---------- 4. 广告位样式 ---------- */
.ad-banner {
  width: 100%;
  min-height: 90px;
  max-width: 728px;
  margin: var(--spacing-md) auto;
  background-color: var(--color-light-gray);
  border: 1px dashed var(--color-medium-gray);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.ad-banner::before {
  content: "广告";
  position: absolute;
  top: 4px;
  right: 8px;
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  background-color: var(--color-medium-gray);
  padding: 1px 6px;
  border-radius: 2px;
}

.ad-sidebar {
  width: 300px;
  height: 250px;
  background-color: var(--color-light-gray);
  border: 1px dashed var(--color-medium-gray);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.ad-sidebar::before {
  content: "广告";
  position: absolute;
  top: 4px;
  right: 8px;
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  background-color: var(--color-medium-gray);
  padding: 1px 6px;
  border-radius: 2px;
}

.ad-inline {
  width: 100%;
  min-height: 250px;
  background-color: var(--color-light-gray);
  border: 1px dashed var(--color-medium-gray);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  margin: var(--spacing-lg) 0;
}

.ad-inline::before {
  content: "广告";
  position: absolute;
  top: 4px;
  right: 8px;
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  background-color: var(--color-medium-gray);
  padding: 1px 6px;
  border-radius: 2px;
}

.ad-mobile-sticky {
  display: none;
  position: fixed;
  bottom: var(--mobile-nav-height);
  left: 0;
  right: 0;
  height: 50px;
  max-width: 320px;
  margin: 0 auto;
  background-color: var(--color-light-gray);
  border: 1px dashed var(--color-medium-gray);
  border-bottom: none;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  z-index: 999;
  align-items: center;
  justify-content: center;
}

.ad-mobile-sticky::before {
  content: "广告";
  position: absolute;
  top: 4px;
  right: 8px;
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  background-color: var(--color-medium-gray);
  padding: 1px 6px;
  border-radius: 2px;
}

/* ---------- 5. 搜索框样式 ---------- */
.search-box {
  position: relative;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
}

.search-box input {
  width: 100%;
  height: 48px;
  padding: 0 48px 0 20px;
  font-size: var(--font-size-body);
  color: var(--color-text-primary);
  background-color: var(--color-white);
  border: 2px solid var(--color-medium-gray);
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.search-box input::placeholder {
  color: var(--color-text-muted);
}

.search-box input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.15);
}

.search-box .search-btn {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-full);
  font-size: 18px;
  transition: background-color var(--transition-fast);
}

.search-box .search-btn:hover {
  background-color: var(--color-primary-hover);
}

.search-box-lg input {
  height: 56px;
  font-size: var(--font-size-h4);
  padding-left: 24px;
}

/* ---------- 6. 卡片样式 ---------- */
.card {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-body {
  padding: var(--spacing-md);
}

.card-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background-color: var(--color-light-gray);
}

/* 歌手卡片 */
.artist-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
  cursor: pointer;
}

.artist-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.artist-card .artist-cover {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  background-color: var(--color-light-gray);
}

.artist-card .artist-info {
  padding: var(--spacing-md);
}

.artist-card .artist-name {
  font-size: var(--font-size-h4);
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.artist-card .artist-meta {
  font-size: var(--font-size-caption);
  color: var(--color-text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 场次卡片 */
.concert-card {
  display: flex;
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.concert-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.concert-card .concert-date {
  flex-shrink: 0;
  width: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-sm);
  text-align: center;
}

.concert-card .concert-date .date-month {
  font-size: var(--font-size-caption);
  font-weight: 500;
  text-transform: uppercase;
}

.concert-card .concert-date .date-day {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.1;
}

.concert-card .concert-info {
  flex: 1;
  padding: var(--spacing-md);
  min-width: 0;
}

.concert-card .concert-title {
  font-size: var(--font-size-h4);
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.concert-card .concert-venue {
  font-size: var(--font-size-caption);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

.concert-card .concert-status {
  font-size: var(--font-size-small);
  color: var(--color-accent);
  font-weight: 600;
}

/* ---------- 7. 标签样式 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 12px;
  font-size: var(--font-size-small);
  font-weight: 500;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  line-height: 1.5;
}

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

.tag-accent {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.tag-light {
  background-color: var(--color-light-gray);
  color: var(--color-text-secondary);
}

.tag-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.tag-encore {
  background-color: #FEF3C7;
  color: #92400E;
}

.tag-classic {
  background-color: #DBEAFE;
  color: #1E40AF;
}

.tag-cover {
  background-color: #F3E8FF;
  color: #7C3AED;
}

.tag-new {
  background-color: #D1FAE5;
  color: #065F46;
}

.tag-hot {
  background-color: #FEE2E2;
  color: #991B1B;
}

/* ---------- 8. 曲目列表样式 ---------- */
.song-list {
  counter-reset: song-counter;
}

.song-list-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--color-light-gray);
  transition: background-color var(--transition-fast);
  counter-increment: song-counter;
}

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

.song-list-item:hover {
  background-color: var(--color-primary-bg);
}

.song-list-item .song-number {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-caption);
  font-weight: 700;
  color: var(--color-text-secondary);
  background-color: var(--color-light-gray);
  border-radius: var(--radius-full);
}

.song-list-item .song-name {
  flex: 1;
  font-size: var(--font-size-body-sm);
  font-weight: 500;
  color: var(--color-text-primary);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.song-list-item .song-tags {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  flex-shrink: 0;
}

.song-list-item .song-duration {
  flex-shrink: 0;
  font-size: var(--font-size-caption);
  color: var(--color-text-muted);
  min-width: 40px;
  text-align: right;
}

/* ---------- 9. 按钮样式 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 10px 20px;
  font-size: var(--font-size-body-sm);
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
  line-height: 1.4;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--color-white);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-primary-bg);
  color: var(--color-primary);
}

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

.btn-accent:hover {
  background-color: var(--color-accent-hover);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-medium-gray);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
  padding: 8px 12px;
}

.btn-ghost:hover {
  background-color: var(--color-light-gray);
  color: var(--color-text-primary);
}

.btn-sm {
  padding: 6px 14px;
  font-size: var(--font-size-caption);
}

.btn-lg {
  padding: 14px 28px;
  font-size: var(--font-size-body);
}

.btn-block {
  display: flex;
  width: 100%;
}

.btn:disabled,
.btn-disabled {
  background-color: var(--color-disabled-bg);
  color: var(--color-disabled);
  cursor: not-allowed;
  pointer-events: none;
  box-shadow: none;
}

/* ---------- 10. 面包屑导航样式 ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) 0;
  font-size: var(--font-size-caption);
  color: var(--color-text-secondary);
}

.breadcrumb a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

.breadcrumb .separator {
  color: var(--color-text-muted);
  font-size: 12px;
}

.breadcrumb .current {
  color: var(--color-text-primary);
  font-weight: 500;
}

/* ---------- 11. 评论区样式 ---------- */
.comment-section {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
}

.comment-section-title {
  font-size: var(--font-size-h3);
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-light-gray);
}

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

.comment-form textarea {
  width: 100%;
  min-height: 100px;
  padding: var(--spacing-md);
  font-size: var(--font-size-body-sm);
  color: var(--color-text-primary);
  background-color: var(--color-light-gray);
  border: 1px solid var(--color-medium-gray);
  border-radius: var(--radius-sm);
  resize: vertical;
  transition: border-color var(--transition-fast);
}

.comment-form textarea:focus {
  border-color: var(--color-primary);
  background-color: var(--color-white);
}

.comment-form-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: var(--spacing-sm);
}

.comment-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.comment-item {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-light-gray);
}

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

.comment-avatar {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background-color: var(--color-medium-gray);
  overflow: hidden;
}

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

.comment-content {
  flex: 1;
  min-width: 0;
}

.comment-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
}

.comment-author {
  font-size: var(--font-size-body-sm);
  font-weight: 600;
  color: var(--color-text-primary);
}

.comment-time {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
}

.comment-text {
  font-size: var(--font-size-body-sm);
  color: var(--color-text-primary);
  line-height: 1.6;
  word-break: break-word;
}

.comment-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xs);
}

.comment-actions button {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: color var(--transition-fast);
}

.comment-actions button:hover {
  color: var(--color-primary);
}

/* ---------- 12. 收藏按钮样式 ---------- */
.favorite-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
  cursor: pointer;
  position: relative;
}

.favorite-btn:hover {
  background-color: var(--color-light-gray);
  color: var(--color-accent);
}

.favorite-btn .heart-icon {
  font-size: 20px;
  transition: transform var(--transition-fast);
}

.favorite-btn:hover .heart-icon {
  transform: scale(1.15);
}

.favorite-btn.active {
  color: var(--color-accent);
}

.favorite-btn.active .heart-icon {
  animation: heartBeat 0.4s ease;
}

.favorite-btn-sm {
  width: 28px;
  height: 28px;
}

.favorite-btn-sm .heart-icon {
  font-size: 16px;
}

/* ---------- 13. 筛选面板样式 ---------- */
.filter-panel {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

.filter-title {
  font-size: var(--font-size-body-sm);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.filter-group {
  margin-bottom: var(--spacing-md);
}

.filter-group:last-child {
  margin-bottom: 0;
}

.filter-group-label {
  font-size: var(--font-size-caption);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.filter-options {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  font-size: var(--font-size-caption);
  font-weight: 500;
  color: var(--color-text-secondary);
  background-color: var(--color-light-gray);
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.filter-chip:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.filter-chip.active {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.filter-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-light-gray);
}

/* ---------- 14. 页面布局 ---------- */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.page-wrapper {
  padding-top: calc(var(--nav-height) + var(--spacing-lg));
  min-height: 100vh;
}

.main-layout {
  display: flex;
  gap: var(--spacing-lg);
  align-items: flex-start;
}

.main-content {
  flex: 1;
  min-width: 0;
}

.sidebar {
  flex-shrink: 0;
  width: var(--sidebar-width);
}

.sidebar .widget {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.sidebar .widget:last-child {
  margin-bottom: 0;
}

.sidebar .widget-title {
  font-size: var(--font-size-h4);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-primary);
}

/* ---------- 15. 页脚样式 ---------- */
.footer {
  background-color: var(--color-dark-gray);
  color: rgba(255, 255, 255, 0.75);
  margin-top: var(--spacing-2xl);
}

.footer-inner {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.footer-col h4 {
  color: var(--color-white);
  font-size: var(--font-size-body-sm);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-col a {
  color: rgba(255, 255, 255, 0.65);
  font-size: var(--font-size-caption);
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--color-white);
}

.footer-col p {
  font-size: var(--font-size-caption);
  line-height: 1.7;
  margin-bottom: 0;
}

.footer-bottom {
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  text-align: center;
  font-size: var(--font-size-small);
  color: rgba(255, 255, 255, 0.45);
}

/* ---------- 16. 工具类 ---------- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent); }
.text-muted { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }
.text-white { color: var(--color-white); }
.text-sm { font-size: var(--font-size-caption); }
.text-xs { font-size: var(--font-size-small); }
.text-lg { font-size: var(--font-size-h3); }
.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }

.mt-0 { margin-top: 0; }
.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mt-30 { margin-top: 30px; }
.mt-40 { margin-top: 40px; }

.mb-0 { margin-bottom: 0; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.mb-30 { margin-bottom: 30px; }
.mb-40 { margin-bottom: 40px; }

.ml-auto { margin-left: auto; }
.mr-auto { margin-right: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }

.p-0 { padding: 0; }
.p-10 { padding: 10px; }
.p-20 { padding: 20px; }
.p-30 { padding: 30px; }

.pt-20 { padding-top: 20px; }
.pb-20 { padding-bottom: 20px; }

.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.flex-1 { flex: 1; }
.flex-shrink-0 { flex-shrink: 0; }
.gap-5 { gap: 5px; }
.gap-10 { gap: 10px; }
.gap-15 { gap: 15px; }
.gap-20 { gap: 20px; }

.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.w-full { width: 100%; }
.h-full { height: 100%; }

.overflow-hidden { overflow: hidden; }
.overflow-ellipsis { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.relative { position: relative; }
.absolute { position: absolute; }

.rounded { border-radius: var(--radius-md); }
.rounded-full { border-radius: var(--radius-full); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.bg-white { background-color: var(--color-white); }
.bg-light { background-color: var(--color-light-gray); }
.bg-primary { background-color: var(--color-primary); }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---------- 17. 动画 ---------- */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes heartBeat {
  0% { transform: scale(1); }
  25% { transform: scale(1.3); }
  50% { transform: scale(1); }
  75% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.fade-in {
  animation: fadeIn 0.4s ease forwards;
}

.fade-in-up {
  animation: fadeInUp 0.5s ease forwards;
}

.slide-in-right {
  animation: slideInRight 0.4s ease forwards;
}

/* ---------- 18. 手机端适配 (<768px) ---------- */
@media screen and (max-width: 767px) {
  :root {
    --font-size-h1: 20px;
    --font-size-h2: 18px;
    --font-size-h3: 16px;
    --font-size-body: 14px;
    --font-size-body-sm: 13px;
    --nav-height: 0px;
  }

  body {
    padding-bottom: calc(var(--mobile-nav-height) + 50px);
  }

  /* 隐藏顶部导航，显示底部导航 */
  .navbar {
    display: none;
  }

  .mobile-nav {
    display: block;
  }

  /* 手机端底部粘性广告显示 */
  .ad-mobile-sticky {
    display: flex;
  }

  /* 搜索框适配 */
  .search-box input {
    height: 44px;
    font-size: var(--font-size-body-sm);
  }

  .search-box-lg input {
    height: 48px;
    font-size: var(--font-size-body);
  }

  /* 布局适配 */
  .page-wrapper {
    padding-top: var(--spacing-md);
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

  .main-layout {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .sidebar {
    width: 100%;
    order: -1;
  }

  /* 广告位适配 */
  .ad-banner {
    min-height: 50px;
    max-width: 100%;
  }

  .ad-sidebar {
    width: 100%;
    height: auto;
    min-height: 250px;
  }

  /* 卡片适配 */
  .artist-card .artist-info {
    padding: var(--spacing-sm);
  }

  .concert-card {
    flex-direction: column;
  }

  .concert-card .concert-date {
    width: 100%;
    flex-direction: row;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .concert-card .concert-date .date-day {
    font-size: 22px;
  }

  /* 曲目列表适配 */
  .song-list-item {
    padding: var(--spacing-sm);
    gap: var(--spacing-sm);
  }

  .song-list-item .song-number {
    width: 24px;
    height: 24px;
    font-size: var(--font-size-small);
  }

  .song-list-item .song-name {
    font-size: var(--font-size-caption);
  }

  .song-list-item .song-tags {
    display: none;
  }

  /* 标签适配 */
  .tag {
    padding: 2px 10px;
    font-size: 11px;
  }

  /* 按钮适配 */
  .btn {
    padding: 8px 16px;
    font-size: var(--font-size-caption);
  }

  .btn-lg {
    padding: 12px 24px;
  }

  /* 筛选面板适配 */
  .filter-panel {
    padding: var(--spacing-sm);
  }

  .filter-options {
    gap: var(--spacing-xs);
  }

  .filter-chip {
    padding: 5px 10px;
    font-size: 11px;
  }

  /* 评论区适配 */
  .comment-section {
    padding: var(--spacing-md);
  }

  .comment-item {
    gap: var(--spacing-sm);
  }

  .comment-avatar {
    width: 32px;
    height: 32px;
  }

  /* 页脚适配 */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .footer-inner {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  /* 网格适配 */
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }

  /* 工具类适配 */
  .mt-20 { margin-top: 16px; }
  .mb-20 { margin-bottom: 16px; }
  .mt-30 { margin-top: 24px; }
  .mb-30 { margin-bottom: 24px; }
  .mt-40 { margin-top: 32px; }
  .mb-40 { margin-bottom: 32px; }
}

/* ---------- 平板适配 (768px - 1024px) ---------- */
@media screen and (min-width: 768px) and (max-width: 1024px) {
  .sidebar {
    width: 250px;
  }

  .grid-4 {
    grid-template-columns: repeat(3, 1fr);
  }
}