/* ============================================================================
 * 班级小助手客户端主题 —— ClassIsland 同款 Fluent 风格
 *
 * 参考 ClassIsland（Windows 课件表应用）的观感：
 *  - WinUI / Fluent 设计语言：浅色 Mica 底 + 半透明"亚克力"卡片 + 1px 细腻描边
 *  - 强调色 #0F6CBD（悬停 #115EA3），选中项用强调色淡底 + 左侧强调条
 *  - 圆角：卡片 8px、控件 4~6px、胶囊 999px
 *  - 字体：Segoe UI Variable / 微软雅黑 UI，字号偏小、行距偏松
 *  - 阴影极轻（0 2px 4px rgba(0,0,0,.04)），层次主要靠描边与底色区分
 * ========================================================================== */

:root {
  /* Fluent 强调色 */
  --ch-accent: #0f6cbd;
  --ch-accent-hover: #115ea3;
  --ch-accent-soft: rgba(15, 108, 189, 0.08);
  --ch-accent-soft-strong: rgba(15, 108, 189, 0.14);

  /* 层次底色（Mica / Layer） */
  --ch-bg: #f3f3f3;
  --ch-layer: rgba(255, 255, 255, 0.7);
  --ch-layer-solid: #ffffff;
  --ch-layer-alt: rgba(249, 249, 249, 0.5);
  --ch-card-subtle: rgba(255, 255, 255, 0.5);

  /* 描边（Fluent 用半透明黑，避免生硬的灰线） */
  --ch-border: rgba(0, 0, 0, 0.06);
  --ch-border-strong: rgba(0, 0, 0, 0.1);
  --ch-divider: rgba(0, 0, 0, 0.05);

  /* 文本 */
  --ch-text: #1b1b1b;
  --ch-text-secondary: #5c5c5c;
  --ch-text-tertiary: #8a8a8a;

  /* 圆角与阴影 */
  --ch-radius-card: 8px;
  --ch-radius-control: 4px;
  --ch-shadow-flyout: 0 8px 16px rgba(0, 0, 0, 0.08);
  --ch-shadow-card: 0 2px 4px rgba(0, 0, 0, 0.04);

  /* 兼容旧变量名 */
  --ch-sidebar: #ffffff;

  /* Element Plus 变量对齐 Fluent */
  --el-color-primary: #0f6cbd;
  --el-color-primary-light-3: #4d94d1;
  --el-color-primary-light-5: #7fb1de;
  --el-color-primary-light-7: #b3d0ec;
  --el-color-primary-light-8: #d0e2f4;
  --el-color-primary-light-9: #e7f0f9;
  --el-color-primary-dark-2: #115ea3;
  --el-border-radius-base: 4px;
  --el-border-radius-small: 3px;
  --el-text-color-primary: #1b1b1b;
  --el-text-color-regular: #3a3a3a;
  --el-text-color-secondary: #5c5c5c;
  --el-border-color: rgba(0, 0, 0, 0.1);
  --el-border-color-light: rgba(0, 0, 0, 0.06);
  --el-border-color-lighter: rgba(0, 0, 0, 0.05);
  --el-fill-color-blank: transparent;
  --el-font-size-base: 13px;
}

* {
  box-sizing: border-box;
}

html,
body,
#app {
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  font-family:
    'Segoe UI Variable Text', 'Segoe UI', 'Microsoft YaHei UI', 'Microsoft YaHei', 'PingFang SC',
    'Helvetica Neue', Arial, sans-serif;
  font-size: 13px;
  background: var(--ch-bg);
  color: var(--ch-text);
  /* 桌面端禁用整页选中，更接近原生应用体验 */
  user-select: none;
  -webkit-font-smoothing: antialiased;
}

input,
textarea {
  user-select: text;
}

/* ---------------------------------------------------------------- 页面骨架 */

.page {
  padding: 16px 20px 24px;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.page-title {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.2px;
}

.page-subtitle {
  margin: 4px 0 0;
  font-size: 12.5px;
  color: var(--ch-text-secondary);
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.mt-12 {
  margin-top: 12px;
}

.mt-16 {
  margin-top: 16px;
}

.text-muted {
  color: var(--ch-text-tertiary);
}

.offline-banner {
  margin: 0 0 12px;
}

/* ---------------------------------------------------------------- 卡片 / 分组 */

/* 亚克力卡片：半透明底 + 极细描边 + 极轻阴影（ClassIsland 的内容卡片观感） */
.el-card {
  border-radius: var(--ch-radius-card) !important;
  border: 1px solid var(--ch-border) !important;
  background: var(--ch-layer) !important;
  backdrop-filter: blur(20px) saturate(1.1);
  box-shadow: var(--ch-shadow-card) !important;
  transition:
    border-color 0.15s ease,
    box-shadow 0.15s ease;
}

.el-card:hover {
  border-color: var(--ch-border-strong) !important;
}

.el-card__header {
  padding: 12px 16px !important;
  border-bottom: 1px solid var(--ch-divider) !important;
  font-weight: 600;
  font-size: 13.5px;
}

.el-card__body {
  padding: 14px 16px !important;
}

/* ---------------------------------------------------------------- 控件 */

.el-button {
  border-radius: var(--ch-radius-control) !important;
  font-weight: 500;
}

.el-button--default {
  background: rgba(255, 255, 255, 0.7) !important;
  border-color: var(--ch-border-strong) !important;
}

.el-button--default:hover {
  background: rgba(0, 0, 0, 0.04) !important;
}

.el-button--primary {
  box-shadow: 0 1px 2px rgba(15, 108, 189, 0.2);
}

.el-input__wrapper,
.el-textarea__inner,
.el-select__wrapper {
  border-radius: var(--ch-radius-control) !important;
  background: rgba(255, 255, 255, 0.7) !important;
  box-shadow: 0 0 0 1px var(--ch-border-strong) inset !important;
}

.el-input__wrapper.is-focus,
.el-select__wrapper.is-focused {
  box-shadow: 0 0 0 1px var(--ch-accent) inset !important;
}

.el-tag {
  border-radius: var(--ch-radius-control) !important;
}

.el-dialog,
.el-drawer {
  border-radius: var(--ch-radius-card) !important;
  background: var(--ch-layer-solid) !important;
}

.el-message-box {
  border-radius: var(--ch-radius-card) !important;
}

.el-popper,
.el-dropdown__popper {
  border-radius: var(--ch-radius-card) !important;
  box-shadow: var(--ch-shadow-flyout) !important;
}

/* ---------------------------------------------------------------- 表格 */

.el-table {
  --el-table-border-color: var(--ch-divider);
  --el-table-header-bg-color: transparent;
  --el-table-row-hover-bg-color: rgba(0, 0, 0, 0.03);
  background: transparent !important;
}

.el-table th.el-table__cell {
  background: transparent !important;
  font-weight: 600;
  color: var(--ch-text-secondary);
}

.el-table td.el-table__cell,
.el-table th.el-table__cell {
  border-bottom: 1px solid var(--ch-divider) !important;
}

.el-table__inner-wrapper::before {
  display: none;
}

/* ---------------------------------------------------------------- 侧边导航（Fluent NavigationView 观感） */

.ch-nav {
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(24px) saturate(1.2);
  border-right: 1px solid var(--ch-border);
}

.ch-nav .el-menu-item {
  height: 40px;
  line-height: 40px;
  margin: 2px 8px;
  border-radius: var(--ch-radius-control);
  color: var(--ch-text);
  font-weight: 500;
  position: relative;
}

.ch-nav .el-menu-item:hover {
  background: rgba(0, 0, 0, 0.04);
}

/* 选中项：强调色淡底 + 左侧强调条（WinUI 经典样式） */
.ch-nav .el-menu-item.is-active {
  background: var(--ch-accent-soft);
  color: var(--ch-text);
}

.ch-nav .el-menu-item.is-active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 16px;
  border-radius: 2px;
  background: var(--ch-accent);
}

/* ---------------------------------------------------------------- 课表时间轴 */

.timetable-cell {
  min-height: 30px;
}

.timetable-course {
  font-weight: 600;
}

.timetable-meta {
  font-size: 12px;
  color: var(--ch-text-tertiary);
}

.unread-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #d13438;
  margin-right: 6px;
}

/* ---------------------------------------------------------------- 滚动条 */

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.18);
  border: 3px solid transparent;
  background-clip: content-box;
  border-radius: 8px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.3);
  background-clip: content-box;
}

::-webkit-scrollbar-track {
  background: transparent;
}