:root {
  /* Colors */
  --bg: #fff8f0; /* 护眼色背景 */
  --card: #ffffff;
  --text: #2c1e1a;
  --text-secondary: #8c6d62;
  --muted: #a1887f;
  --border: #e0d5d1;
  --primary: #ff6347;
  --success: #10b981;
  
  /* Shadows */
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Animations */
  --shimmer-duration: 1.5s;
  --scale-duration: 0.5s;
  --transition-normal: 0.2s;
  --transition-slow: 0.3s;
}

/* Base Styles */
* { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  padding: 0 16px 24px;
  min-height: 100vh;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
}

/* Header Styles */
.hero {
  position: sticky;
  top: 0;
  z-index: 10;
  margin: 0 -16px;
  padding: 24px 16px 16px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 0 0 24px 24px;
}

.hero .wrap { 
  max-width: 1120px; 
  margin: 0 auto; 
  display: flex; 
  align-items: flex-end; 
  justify-content: space-between; 
  gap: 12px; 
}

.brand {
  color: var(--text);
}

.brand h1 {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.brand .sub {
  margin-top: 6px;
  font-size: 1rem;
  color: var(--text-secondary);
  font-weight: 400;
}

/* Input and Button Styles */
.actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.toolbar { 
  display: flex; 
  gap: 12px; 
  flex-wrap: wrap; 
  align-items: center; 
  margin: 20px 0; 
  position: relative; /* 为搜索框的绝对定位提供参考 */
}

/* 确保搜索容器不换行 */
.toolbar > * {
  flex-shrink: 0;
}

/* 搜索模式时的布局调整 */
.toolbar.search-mode {
  position: relative;
}

.toolbar.search-mode > *:not(.search-container):not(.btn-home) {
  opacity: 0.3;
  pointer-events: none;
}

/* 主页按钮在搜索模式时保持正常 */
.toolbar.search-mode .btn-home {
  opacity: 1;
  pointer-events: all;
}

/* 搜索容器保持原位置 */
.toolbar.search-mode .search-container {
  position: relative;
  z-index: 100;
}

/* 搜索模式时隐藏搜索按钮 */
.toolbar.search-mode .search-btn {
  opacity: 0;
  pointer-events: none;
}

.input, .select {
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  outline: none;
  min-width: 220px;
  color: var(--text);
  box-shadow: var(--shadow);
  transition: all var(--transition-normal) ease;
  font-size: 0.95rem;
  font-weight: 500;
}

.input:focus, .select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255, 99, 71, 0.1);
}

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

.btn-view {
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: all var(--transition-normal) ease;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: auto;
  font-weight: 500;
}

.btn-view:hover { 
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  background: rgba(255, 99, 71, 0.05);
}

.view-icon {
  font-size: 18px;
}

/* Home Button Styles */
.btn-home {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text);
  background: linear-gradient(135deg, var(--card) 0%, rgba(255, 99, 71, 0.05) 100%);
}

.btn-home:hover {
  background: linear-gradient(135deg, rgba(255, 99, 71, 0.1) 0%, rgba(255, 99, 71, 0.15) 100%);
  color: var(--primary);
}

.home-icon {
  font-size: 16px;
}

.home-text {
  font-size: 14px;
  font-weight: 500;
}

/* 响应式设计 - 移动端优化 */
@media (max-width: 768px) {
  .toolbar {
    gap: 8px;
  }
  
  .btn-home .home-text {
    display: none; /* 移动端隐藏文字，只显示图标 */
  }
  
  .btn-home {
    min-width: 48px; /* 确保足够的点击区域 */
    justify-content: center;
  }
  
  .home-icon {
    font-size: 18px; /* 移动端稍大一些的图标 */
  }
}

/* File Time Display */
.file-time {
  color: var(--muted);
  font-size: 0.85em;
  font-weight: 400;
  margin-left: 8px;
}

.cover-meta .file-time {
  display: block;
  margin-left: 0;
  margin-top: 4px;
}

/* Search Container Styles */
.search-container {
  position: relative;
  display: flex;
  align-items: center;
  flex: 1; /* 允许搜索容器扩展 */
}

.search-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 48px;
}

.search-icon {
  font-size: 16px;
}

.search-input {
  position: absolute;
  left: 0;
  top: 0;
  width: 300px; /* 固定宽度，向右扩展 */
  z-index: 100;
  box-shadow: var(--shadow-lg);
}

@media (max-width: 768px) {
  .file-time {
    font-size: 0.8em;
  }
  
  .search-input {
    width: 250px; /* 移动端较小的固定宽度 */
  }
}

/* Grid Layout */
.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.cover-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 20px;
}

/* Card Styles */
.card { 
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: all var(--transition-slow) ease;
  position: relative;
}

.card:hover { 
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

/* 卡片链接基础样式 */
.card a, .cover-card a {
  text-decoration: none;
  color: inherit;
}

.card a {
  display: block;
  padding: 16px;
}

.row {
  display: flex;
  gap: 14px;
  align-items: center;
}

/* 缩略图样式 */
.thumb { 
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--text);
  font-size: 0.85rem;
  cursor: pointer;
  transition: transform var(--transition-normal) ease;
  flex-shrink: 0;
}

.thumb:hover {
  transform: scale(1.1);
}

/* 有封面的缩略图 */
.thumb.has-cover {
  color: transparent;
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.05);
}

/* Typography */
/* 标题样式 */
.title, .cover-title { 
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
  font-size: 0.95rem;
}

/* 元数据样式 */
.meta, .cover-meta { 
  display: flex;
  gap: 8px;
  align-items: center;
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.meta {
  margin-top: 8px;
}

.cover-meta {
  flex-wrap: wrap;
}



/* 通用标签样式 */
.chip, .pill { 
  border-radius: 999px;
  font-weight: 500;
}

.chip { 
  padding: 8px 14px;
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--card);
  font-size: 0.875rem;
}

.pill { 
  padding: 4px 10px;
  background: rgba(255, 99, 71, 0.1);
  color: var(--primary);
  border: 1px solid rgba(255, 99, 71, 0.2);
}

.cover-pill {
  padding: 4px 8px;
  font-size: 0.75rem;
}

/* Cover Card Styles */
.cover-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: all var(--transition-slow) ease;
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.cover-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

.cover-card a {
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.cover-image {
  width: 100%;
  height: 280px;
  background: var(--card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--text);
  font-size: 24px;
  position: relative;
  overflow: hidden;
  border-radius: 16px 16px 0 0;
  flex-shrink: 0;
  cursor: pointer;
  transition: transform var(--transition-normal) ease;
}

.cover-image:hover {
  transform: scale(1.02);
}

.cover-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  border-radius: 8px 8px 0 0;
}

.cover-image .fallback {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}

.cover-info {
  padding: 16px 18px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.cover-title {
  font-weight: 600;
  line-height: 1.4;
  font-size: 0.95rem;
  margin-bottom: 8px;
  color: var(--text);
}

.cover-meta {
  display: flex;
  gap: 8px;
  align-items: center;
  color: var(--text-secondary);
  font-size: 0.8rem;
  flex-wrap: wrap;
}

/* Status Indicators */
.empty {
  color: var(--muted);
  padding: 12px;
  text-align: center;
}

.download-progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 8px 12px;
  z-index: 20;
  border-radius: 20px 20px 0 0;
}

.progress-bar {
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 6px;
}

.progress-fill {
  height: 100%;
  background: var(--primary);
  transition: width var(--transition-normal) ease;
  position: relative;
}

.progress-fill::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0.2) 50%,
    rgba(255, 255, 255, 0) 100%
  );
  animation: shimmer var(--shimmer-duration) linear infinite;
}

.progress-text {
  font-size: 0.75rem;
  color: white;
  display: block;
  text-align: center;
  font-weight: 500;
}

.download-complete-label {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--success);
  color: white;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
  z-index: 25;
  animation: fadeInScale var(--scale-duration) ease;
}

.card .download-complete-label {
  top: 8px;
  right: 8px;
  padding: 4px 8px;
  font-size: 0.7rem;
}

/* Skeleton Loading */
.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 14px;
}

.skeleton-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 14px;
}

.skeleton-row {
  display: flex;
  gap: 12px;
  align-items: center;
}

/* 定义骨架屏加载动画基类 */
[class*="sk-"] {
  background: linear-gradient(90deg, #eee, #f5f5f5, #eee);
  background-size: 200% 100%;
  animation: shimmer var(--shimmer-duration) linear infinite;
}

.sk-thumb {
  width: 44px;
  height: 44px;
  border-radius: 12px;
}

.sk-line {
  height: 12px;
  border-radius: 8px;
}

.sk-line.w70 {
  width: 70%;
}

.sk-line.w40 {
  width: 40%;
  margin-top: 8px;
}

/* Animations */
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

@keyframes fadeInScale {
  from { opacity: 0; transform: scale(0.8); }
  to { opacity: 1; transform: scale(1); }
}

/* Responsive Styles */
@media (max-width: 900px) {
  /* 网格布局调整为2列 */
  .grid, .skeleton-grid {
    grid-template-columns: repeat(2, minmax(0,1fr));
  }
  
  .cover-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
  }
}

@media (max-width: 620px) {
  /* 网格布局调整为1列 */
  .grid, .skeleton-grid {
    grid-template-columns: 1fr;
  }
  
  /* 输入框和选择框宽度调整 */
  .input, .select {
    min-width: 160px;
  }
  
  /* 顶部导航栏样式调整 */
  .hero {
    position: static;
    border-bottom: none;
    border-radius: 0 0 20px 20px;
  }
  
  /* 封面网格调整 */
  .cover-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 14px;
  }
  
  .cover-image {
    height: 220px;
  }
}