/* ==========================================================================
   GaoShu-Review App Shell Layout: Topbar, Collapsible Sidebar & Mobile Nav
   ========================================================================== */

/* 顶部固定栏 (56px) */
.topbar {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--topbar-h);
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 16px;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.sidebar-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--c-text-2);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.sidebar-toggle-btn:hover {
  background: var(--c-surface-2);
  color: var(--c-text);
}

.topbar-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--c-text);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.topbar-brand:hover {
  color: var(--c-primary);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--c-primary);
  color: #ffffff;
  font-family: "Times New Roman", Georgia, serif;
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1;
}

.brand-subtitle {
  font-size: var(--fs-12);
  font-weight: 500;
  color: var(--c-text-2);
  padding-left: 6px;
  border-left: 1px solid var(--c-border);
}

/* 顶栏全局搜索框与即时搜索浮层 */
.topbar-search {
  position: relative;
  flex: 1 1 420px;
  max-width: 460px;
}

.topbar-search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.topbar-search-icon {
  position: absolute;
  left: 11px;
  color: var(--c-text-2);
  font-size: 0.9rem;
  pointer-events: none;
}

.topbar-search-input {
  width: 100%;
  height: 36px;
  padding: 0 68px 0 34px;
  border-radius: 999px;
  border: 1px solid var(--c-border);
  background: var(--c-bg);
  color: var(--c-text);
  font-size: var(--fs-14);
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.topbar-search-input:focus {
  outline: none;
  background: var(--c-surface);
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px var(--c-primary-weak);
}

.topbar-search-kbd {
  position: absolute;
  right: 10px;
  pointer-events: none;
}

.quick-search-popover {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  max-height: 420px;
  overflow-y: auto;
  z-index: 320;
  display: none;
}

.quick-search-popover.is-open {
  display: block;
}

.quick-search-group-title {
  padding: 8px 14px 4px;
  font-size: var(--fs-12);
  font-weight: 700;
  color: var(--c-text-2);
  background: var(--c-surface-2);
}

.quick-search-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 14px;
  color: var(--c-text);
  font-size: var(--fs-14);
  border-bottom: 1px solid var(--c-border);
  cursor: pointer;
  text-decoration: none;
}

.quick-search-item:hover,
.quick-search-item.is-active {
  background: var(--c-primary-weak);
  color: var(--c-primary);
}

.quick-search-footer {
  padding: 8px 14px;
  font-size: var(--fs-12);
  text-align: center;
  color: var(--c-primary);
  background: var(--c-surface-2);
  cursor: pointer;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.topbar-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--c-text);
  font-size: 1.05rem;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.topbar-icon-btn:hover {
  background: var(--c-surface-2);
  border-color: var(--c-border);
  color: var(--c-primary);
}

/* 主体布局容器 */
.app-body {
  display: flex;
  min-height: calc(100vh - var(--topbar-h));
  align-items: stretch;
}

/* 左侧 220px 可折叠侧栏 */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--c-surface);
  border-right: 1px solid var(--c-border);
  padding: 12px 10px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: sticky;
  top: var(--topbar-h);
  height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
  transition: width 0.2s ease;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-section-label {
  padding: 10px 12px 4px;
  font-size: var(--fs-12);
  font-weight: 600;
  color: var(--c-text-2);
  letter-spacing: 0.03em;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 8px;
  color: var(--c-text);
  font-size: 0.94rem;
  font-weight: 500;
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease;
  position: relative;
}

.nav-link:hover {
  background: var(--c-surface-2);
  color: var(--c-primary);
}

.nav-link.is-active {
  background: var(--c-primary-weak);
  color: var(--c-primary);
  font-weight: 600;
}

.nav-icon {
  width: 22px;
  text-align: center;
  font-size: 1.08rem;
  flex-shrink: 0;
  line-height: 1;
}

.nav-label {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 18px;
  padding: 0 6px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  background: var(--c-danger);
  color: #ffffff;
  line-height: 1;
}

.nav-badge.badge-primary {
  background: var(--c-primary);
}

.nav-badge:empty {
  display: none;
}

.sidebar-footer {
  padding: 10px 12px 4px;
  border-top: 1px solid var(--c-border);
  font-size: var(--fs-12);
  color: var(--c-text-2);
}

/* 桌面端手动折叠侧栏态 */
body.sidebar-collapsed .sidebar {
  width: var(--sidebar-rail-w);
  padding: 12px 8px;
}

body.sidebar-collapsed .nav-label,
body.sidebar-collapsed .sidebar-section-label,
body.sidebar-collapsed .sidebar-footer {
  display: none;
}

body.sidebar-collapsed .nav-link {
  justify-content: center;
  padding: 10px 0;
}

body.sidebar-collapsed .nav-badge {
  position: absolute;
  top: 4px;
  right: 4px;
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  font-size: 10px;
}

/* 主视图内容区 */
.main-wrap {
  flex: 1;
  min-width: 0;
  padding: 24px 28px 48px;
}

#view {
  max-width: 1040px;
  margin: 0 auto;
  width: 100%;
}

.view-fade-in {
  animation: viewFadeIn 0.15s ease-out;
}

@keyframes viewFadeIn {
  from { opacity: 0; transform: translateY(3px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 移动端底部 5-Tab 导航栏（默认桌面隐藏） */
.bottom-nav {
  display: none;
}

.mobile-more-menu {
  display: none;
}

/* 平板端 (768px - 1023px)：自动折叠为 64px 图标栏 */
@media (min-width: 768px) and (max-width: 1023px) {
  .brand-subtitle {
    display: none;
  }

  .sidebar {
    width: var(--sidebar-rail-w);
    padding: 12px 8px;
  }

  .sidebar:not(.is-expanded-tablet) .nav-label,
  .sidebar:not(.is-expanded-tablet) .sidebar-section-label,
  .sidebar:not(.is-expanded-tablet) .sidebar-footer {
    display: none;
  }

  .sidebar:not(.is-expanded-tablet) .nav-link {
    justify-content: center;
    padding: 10px 0;
  }

  .sidebar:not(.is-expanded-tablet) .nav-badge {
    position: absolute;
    top: 4px;
    right: 4px;
    min-width: 16px;
    height: 16px;
    padding: 0 4px;
    font-size: 10px;
  }

  .sidebar.is-expanded-tablet {
    position: fixed;
    left: 0;
    top: var(--topbar-h);
    width: var(--sidebar-w);
    z-index: 250;
    box-shadow: var(--shadow-lg);
  }

  .main-wrap {
    padding: 20px 20px 40px;
  }
}

/* 移动端 (< 768px)：底部 5-Tab 导航栏 */
@media (max-width: 767px) {
  .topbar {
    padding: 0 12px;
    gap: 8px;
  }

  .sidebar-toggle-btn,
  .brand-subtitle,
  .topbar-search-kbd {
    display: none;
  }

  .topbar-brand span.brand-text {
    font-size: 0.95rem;
  }

  .topbar-search-input {
    padding-right: 12px;
    height: 34px;
  }

  .sidebar {
    display: none;
  }

  .main-wrap {
    padding: 14px 12px calc(var(--bottomnav-h) + 24px);
  }

  .bottom-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    height: var(--bottomnav-h);
    background: var(--c-surface);
    border-top: 1px solid var(--c-border);
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    align-items: center;
    z-index: 220;
    padding-bottom: env(safe-area-inset-bottom, 0);
  }

  .bottom-nav-item {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    height: 100%;
    color: var(--c-text-2);
    font-size: 11px;
    font-weight: 500;
    text-decoration: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 4px 2px;
  }

  .bottom-nav-item .bnav-icon {
    font-size: 1.2rem;
    line-height: 1.1;
  }

  .bottom-nav-item.is-active {
    color: var(--c-primary);
    font-weight: 600;
  }

  .bottom-nav-item .nav-badge {
    position: absolute;
    top: 4px;
    right: calc(50% - 22px);
    min-width: 16px;
    height: 15px;
    font-size: 10px;
    padding: 0 4px;
  }

  /* 移动端“我的/更多”上拉菜单面板 */
  .mobile-more-menu {
    position: fixed;
    left: 10px;
    right: 10px;
    bottom: calc(var(--bottomnav-h) + 10px);
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 12px;
    z-index: 230;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .mobile-more-menu.is-open {
    display: grid;
  }

  .mobile-more-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 10px 6px;
    border-radius: 8px;
    background: var(--c-bg);
    color: var(--c-text);
    font-size: var(--fs-12);
    font-weight: 500;
    text-decoration: none;
    text-align: center;
  }

  .mobile-more-link.is-active {
    background: var(--c-primary-weak);
    color: var(--c-primary);
  }
}