/* ========================================
   西夏文学习平台 · 布局样式
   ======================================== */

body {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* 侧边栏 */
#sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--color-border);
  background: var(--color-bg);
  overflow-y: auto;
}

/* 移动端汉堡菜单按钮 */
#sidebarToggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 9000;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 1.3rem;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-card);
  transition: all var(--transition);
}
#sidebarToggle:hover {
  background: var(--color-bg-hover);
}

/* 移动端侧边栏遮罩 */
#sidebarOverlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.3);
  z-index: 8999;
  opacity: 0;
  transition: opacity 0.3s ease;
}
#sidebarOverlay.show {
  display: block;
  opacity: 1;
}

.sidebar-header {
  padding: 24px 20px 16px;
  border-bottom: 1px solid var(--color-border-light);
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo-icon {
  font-size: 1.5rem;
  color: var(--color-primary);
}
.logo-glyph {
  width: 36px;
  height: auto;
  object-fit: contain;
}
.logo-text {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text);
}

/* 导航 */
.sidebar-nav {
  flex: 1;
  padding: 12px 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
  cursor: pointer;
}
.nav-item:hover {
  background: var(--color-bg-hover);
  color: var(--color-text);
}
.nav-item.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
}
.nav-icon { font-size: 1.1rem; }

/* 侧边栏底部 */
.sidebar-footer {
  border-top: 1px solid var(--color-border-light);
  padding: 12px 0 8px;
}
.sidebar-auth {
  padding: 10px 20px 6px;
  display: flex;
  gap: 6px;
}
.sidebar-sync {
  padding: 6px 20px 4px;
  text-align: center;
}
.sidebar-credit {
  padding: 8px 20px 14px;
  text-align: center;
  font-size: 0.7rem;
  color: var(--color-text-light);
  letter-spacing: 0.3px;
}
.stat-summary {
  display: flex;
  justify-content: space-between;
  padding: 0 20px 8px;
}
.stat-item { text-align: center; }
.stat-number {
  display: block;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
}
.stat-label {
  font-size: 0.75rem;
  color: var(--color-text-light);
}

/* 主内容区 - 默认不滚动，各页面自行控制 */
#main-content {
  flex: 1;
  overflow: hidden;
  background: var(--color-bg);
}

.page {
  display: none;
  padding: 40px 48px;
  max-width: 1200px;
  animation: pageIn 0.25s ease;
}
.page.active {
  display: block;
  height: 100%;
  overflow-y: auto;
}

@keyframes pageIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-header {
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.page-header h1 { margin-bottom: 4px; }
.page-subtitle { color: var(--color-text-secondary); font-size: 0.9rem; margin: 0; }
.header-actions { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }

/* ---- 记忆卡片页面 — 头部标签按钮（行内） ---- */
.tab-btn {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 5px 14px;
  border: 1px solid var(--color-border);
  border-radius: 18px;
  background: var(--color-bg);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
  line-height: 1.4;
}
.tab-btn:hover { border-color: var(--color-primary); color: var(--color-primary); background: var(--color-primary-light); }
.tab-btn.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* 顶部操作栏分隔线 */
.header-actions-sep {
  width: 1px;
  height: 22px;
  background: var(--color-border);
  margin: 0 6px;
  flex-shrink: 0;
}

/* ---- 标签栏（旧版，保留兼容） ---- */
.tab-bar {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 20px;
}
.tab {
  padding: 10px 20px;
  border: none;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
}
.tab:hover { color: var(--color-text); background: var(--color-bg-hover); }
.tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}
.tab-content { display: none; }
.tab-content.active { display: block; }

/* 记忆卡片页面 — 撑满垂直空间 */
#page-flashcard.active {
  display: flex;
  flex-direction: column;
}
#page-flashcard.active .tab-content.active {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

/* ===== 沉浸模式 ===== */
#page-flashcard.pure-mode .page-header,
#page-flashcard.pure-mode .tab-bar,
#page-flashcard.pure-mode .review-hint {
  display: none !important;
}
#page-flashcard.pure-mode .review-card-container {
  max-width: 100%;
}
#page-flashcard.pure-mode .flashcard {
  max-width: 95vw;
  max-height: 90vh;
  flex: 1;
  margin: auto 0;
}

/* 沉浸模式 — 卡片正面西夏文放大 */
#page-flashcard.pure-mode .card-front .card-glyph img {
  max-width: 100%;
  max-height: 100%;
}

/* 沉浸模式 — 卡片背面内容放大 */
#page-flashcard.pure-mode .card-back {
  padding: 32px 32px;
}
#page-flashcard.pure-mode .card-glyph-small img {
  max-width: 300px;
  max-height: 300px;
}
#page-flashcard.pure-mode .field-label {
  font-size: 1rem;
  min-width: 90px;
}
#page-flashcard.pure-mode .field-value {
  font-size: 1.2rem;
  line-height: 1.6;
}
#page-flashcard.pure-mode .field-value img {
  max-width: 200px;
  max-height: 50px;
}
#page-flashcard.pure-mode .core-badge {
  font-size: 0.9rem;
  padding: 3px 12px;
}

/* 沉浸模式开关（内联在 header-actions 中） */
.pure-toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 16px;
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  transition: all 0.2s;
  vertical-align: middle;
}
.pure-toggle:hover {
  border-color: var(--color-border, #ddd);
  background: var(--color-bg-hover, rgba(128,0,32,0.04));
}
.pure-toggle-track {
  display: inline-block;
  width: 26px;
  height: 14px;
  border-radius: 8px;
  background: var(--color-border, #ccc);
  position: relative;
  transition: background 0.25s;
  flex-shrink: 0;
}
.pure-toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #fff;
  transition: transform 0.25s;
  box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}
#page-flashcard.pure-mode .pure-toggle-track {
  background: var(--color-primary, #800020);
}
#page-flashcard.pure-mode .pure-toggle-thumb {
  transform: translateX(12px);
}

/* 沉浸模式退出按钮（浮动右上角） */
.pure-exit-btn {
  position: fixed;
  top: 12px;
  right: 12px;
  z-index: 9999;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--color-border, #ddd);
  cursor: pointer;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--color-primary, #800020);
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  transition: all 0.2s;
}
.pure-exit-btn:hover {
  background: rgba(255,255,255,0.95);
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}

/* 仪表盘 */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}
.dashboard-bottom {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 720px) {
  .dashboard-bottom { grid-template-columns: 1fr; }
  .page { padding: 24px; }
}

.dash-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: box-shadow var(--transition);
}
.dash-card:hover { box-shadow: var(--shadow-hover); }
.dash-card h3 { font-size: 0.95rem; color: var(--color-text-secondary); margin-bottom: 12px; }
.dash-number {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}
.dash-desc { font-size: 0.85rem; color: var(--color-text-light); margin-bottom: 12px; }

.stat-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 0.88rem;
  border-bottom: 1px solid var(--color-border-light);
}
.stat-row:last-child { border-bottom: none; }

.quick-search { position: relative; }
.quick-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-pop);
  max-height: 240px;
  overflow-y: auto;
  z-index: 100;
  display: none;
}
.quick-results.show { display: block; }
.quick-result-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  cursor: pointer;
  transition: background var(--transition);
}
.quick-result-item:hover { background: var(--color-bg-hover); }
.quick-result-item .q-glyph { width: 28px; height: 28px; object-fit: contain; }
.quick-result-item .q-meaning { font-size: 0.85rem; color: var(--color-text-secondary); }

/* ========================================
   响应式适配
   ======================================== */

/* 平板 (<1024px) */
@media (max-width: 1024px) {
  .page { padding: 32px 28px; }
  .dashboard-bottom { grid-template-columns: 1fr 1fr; }
}

/* 手机 (<768px) */
@media (max-width: 768px) {
  body { flex-direction: column; }

  /* 侧边栏变成抽屉 */
  #sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 9001;
    width: 280px;
    min-width: 280px;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    box-shadow: none;
  }
  #sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 20px rgba(0,0,0,0.15);
  }

  /* 显示汉堡按钮 */
  #sidebarToggle { display: flex; }

  /* 主内容区全宽 */
  #main-content {
    padding-top: 0;
    width: 100%;
  }

  .page {
    padding: 56px 16px 24px;  /* 顶部留出汉堡按钮空间 */
  }

  .page-header { flex-direction: column; align-items: flex-start; }
  .page-header h1 { font-size: 1.35rem; }
  .header-actions { width: 100%; flex-wrap: wrap; }

  /* 仪表盘 */
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
  .dashboard-bottom {
    grid-template-columns: 1fr;
  }
  .dash-card { padding: 16px; }
  .dash-number { font-size: 1.8rem; }

  /* 导航项增大触控区域 */
  .nav-item { padding: 12px 14px; font-size: 0.95rem; }

  /* 侧边栏内容内边距 */
  .sidebar-header { padding: 20px 16px 14px; }
  .sidebar-nav { padding: 10px 8px; }

  /* 模态框全屏 */
  .modal { width: 95%; max-height: 90vh; }
  .modal-body { padding: 16px; }
}

/* 小屏手机 (<420px) */
@media (max-width: 420px) {
  .page { padding: 52px 12px 20px; }
  .page-header h1 { font-size: 1.2rem; }
  .dash-card { padding: 12px; }
  .sidebar-auth { flex-direction: column; gap: 4px; }
  .sidebar-auth .btn { width: 100%; }
}

/* 手机端记忆卡片页面 — 压缩周围元素为卡片腾空间 */
@media (max-width: 768px) {
  #page-flashcard .page-header {
    margin-bottom: 6px;
  }
  #page-flashcard .page-header h1 {
    font-size: 1.1rem;
    margin: 0;
  }
  #page-flashcard .header-actions {
    gap: 4px;
  }
  #page-flashcard .header-actions .btn {
    font-size: 0.72rem;
    padding: 4px 8px;
  }
  #page-flashcard .review-progress {
    margin-bottom: 8px;
    font-size: 0.78rem;
  }
  #page-flashcard .review-actions {
    margin-top: 4px;
    gap: 4px;
  }
  #page-flashcard .review-hint {
    margin-top: 2px;
  }
  #page-flashcard .review-hint .btn {
    font-size: 0.7rem;
    padding: 2px 6px;
  }
  /* 手机端卡片固定，不溢出滚动（仅复习模式） */
  #page-flashcard.active .tab-content.active#fc-review {
    overflow: hidden;
  }
  #page-flashcard.active .tab-content.active#fc-browse {
    overflow-y: auto;
  }
  #page-flashcard .flashcard {
    max-height: 85vh;
    overflow: hidden;
  }
  /* 平板沉浸模式 */
  #page-flashcard.pure-mode .flashcard {
    max-width: 100%;
    max-height: 85vh;
  }
  /* 手机沉浸模式 — 卡片背面内容缩小以完整显示 */
  #page-flashcard.pure-mode .card-glyph-small img {
    max-width: 100px;
    max-height: 100px;
    margin-bottom: 4px;
  }
  #page-flashcard.pure-mode .field-value {
    font-size: 0.78rem;
    line-height: 1.3;
  }
  #page-flashcard.pure-mode .field-label {
    font-size: 0.7rem;
    min-width: auto;
  }
  #page-flashcard.pure-mode .field-value img {
    max-width: 90px;
    max-height: 24px;
  }
  #page-flashcard.pure-mode .card-back {
    padding: 10px 12px 8px;
  }
  #page-flashcard.pure-mode .core-badge {
    font-size: 0.68rem;
    padding: 1px 6px;
  }
  #page-flashcard.pure-mode .card-field {
    padding: 2px 0;
  }
}

/* 小屏手机进一步压缩 */
@media (max-width: 420px) {
  #page-flashcard .page-header h1 {
    font-size: 1rem;
  }
  #page-flashcard .header-actions .btn {
    font-size: 0.68rem;
    padding: 3px 6px;
  }
  #page-flashcard.pure-mode .flashcard {
    max-height: 85vh;
  }
}

/* 超小屏 / 微信浏览器 — 极致压缩顶部间距为卡片内容腾空间 */
@media (max-width: 420px) {
  #page-flashcard .page-header {
    margin-bottom: 4px;
    gap: 4px;
  }
  #page-flashcard .tab-bar {
    margin-bottom: 6px;
  }
  #page-flashcard .tab {
    padding: 6px 12px;
    font-size: 0.8rem;
  }
  #page-flashcard .review-progress {
    margin-bottom: 4px;
  }
  #page-flashcard .card-side {
    padding: 12px 12px;
  }
  #page-flashcard.pure-mode .flashcard {
    max-height: 92vh;
  }
  #page-flashcard.pure-mode .card-back {
    padding: 8px 10px 6px;
  }
}

/* 知识测验 — 小屏压缩 */
@media (max-width: 420px) {
  #page-quiz .page-header {
    margin-bottom: 8px;
  }
  #page-quiz .quiz-settings {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
  }
  #page-quiz .quiz-settings label {
    font-size: 0.82rem;
    white-space: nowrap;
  }
  #page-quiz .quiz-settings .input {
    font-size: 0.82rem;
    padding: 4px 6px;
  }
}