/* =============================================================
   ui-refine.css  ·  shadcn/ui 风格统一精修层（v=20260916o）
   仅视觉覆盖：不改 DOM 结构 / 类名 / 业务逻辑 / 接口
   在 main.css、english.css 之后加载
   设计语言：中性色阶优先、克制边框与阴影、统一圆角间距、
   充足留白、150ms 柔和过渡、信息层级清晰
   ============================================================= */

:root {
  /* shadcn/ui 风格 token（HSL 分量，便于调透明度） */
  --ui-bg:            hsl(210 40% 98%);   /* 内容区背景 */
  --ui-card:          #FFFFFF;
  --ui-muted:         hsl(210 40% 96%);   /* 浅灰底 / 表头 / hover */
  --ui-muted-2:       hsl(210 30% 94%);
  --ui-fg:            hsl(222 47% 11%);   /* 主文字 #0F172A */
  --ui-fg-2:          hsl(215 16% 47%);   /* 次要文字 #64748B */
  --ui-fg-3:          hsl(215 18% 60%);   /* 弱化文字 */
  --ui-border:        hsl(214 32% 91%);   /* 边框 #E2E8F0 */
  --ui-border-strong: hsl(215 25% 85%);
  --ui-input:         hsl(214 32% 89%);
  --ui-primary:       hsl(221 83% 53%);   /* #2563EB */
  --ui-primary-hover: hsl(224 76% 48%);   /* #1D4ED8 */
  --ui-primary-soft:  hsl(214 95% 93%);   /* #DBEAFE-ish */
  --ui-ring:          hsl(221 83% 53% / .30);
  --ui-success:       hsl(142 71% 45%);
  --ui-warning:       hsl(38 92% 50%);
  --ui-danger:        hsl(0 84% 60%);
  --ui-radius:        8px;
  --ui-radius-lg:     12px;
  --ui-shadow-sm:     0 1px 2px rgba(16,24,40,.04);
  --ui-shadow:        0 1px 2px rgba(16,24,40,.04), 0 1px 3px rgba(16,24,40,.06);
  --ui-shadow-hover:  0 4px 16px rgba(16,24,40,.08), 0 1px 2px rgba(16,24,40,.04);
  --ui-shadow-modal:  0 24px 48px -12px rgba(16,24,40,.20), 0 8px 20px -8px rgba(16,24,40,.12);
  --ui-ease:          .15s ease;
}

/* ---------- 基础排版：层级与数字 ---------- */
body {
  background: var(--ui-bg);
  color: var(--ui-fg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
.main-content, .page-content, .content-area { background: transparent; }

/* 内容区留白统一 */
.main-content { padding: 24px; }
.page-header { margin-bottom: 20px; }

/* 滚动条：细、中性色 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: hsl(215 20% 85%);
  border-radius: 999px;
  border: 2px solid var(--ui-bg);
}
::-webkit-scrollbar-thumb:hover { background: hsl(215 16% 72%); }

/* 全局交互过渡（仅影响常见交互属性，避免布局抖动） */
a, button, .btn, .nav-item, .tag, .badge,
.pager-btn, .page-btn, .stat-card, .card, .tr-clickable,
.clickable, .list-item {
  transition-timing-function: ease;
  transition-duration: 150ms;
}

h1, h2, h3, h4 { letter-spacing: -.01em; color: var(--ui-fg); }

/* 数字 / 金额 / 统计使用等宽数字，避免跳动 */
.stat-card .stat-value, .stat-value, .stat-number,
.metric-value, .big-number, .kpi-value, .stat-card strong,
.data-table td.num, .num, .stat-num {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
}

/* =============================================================
   卡片 Card
   ============================================================= */
.card, .stat-card, .metric-card, .exc-tcard,
.filter-bar, .table-container, .table-wrapper,
.form-section, .panel, .info-card, .detail-card {
  background: var(--ui-card);
  border: 1px solid var(--ui-border);
  border-radius: var(--ui-radius-lg);
  box-shadow: var(--ui-shadow-sm);
}

.card, .stat-card, .metric-card {
  transition: box-shadow var(--ui-ease), transform var(--ui-ease), border-color var(--ui-ease);
}
.card:hover, .stat-card:hover {
  box-shadow: var(--ui-shadow-hover);
  border-color: var(--ui-border-strong);
}

/* 统计卡：核心数字大号加粗、标签弱化 */
.stat-card, .metric-card { padding: 20px; }
.stat-card .stat-label, .stat-label, .metric-label,
.stat-card .stat-desc, .stat-sub {
  color: var(--ui-fg-2);
  font-size: 13px;
  font-weight: 500;
}
.stat-card .stat-value, .stat-value, .metric-value,
.big-number, .stat-number {
  color: var(--ui-fg);
  font-weight: 700;
  letter-spacing: -.02em;
}

/* =============================================================
   按钮 Button（shadcn: primary / outline / ghost / destructive）
   ============================================================= */
.btn,
button.btn, .btn-sm {
  border-radius: var(--ui-radius);
  font-weight: 500;
  letter-spacing: 0;
  transition: background-color var(--ui-ease), color var(--ui-ease),
              border-color var(--ui-ease), box-shadow var(--ui-ease),
              transform var(--ui-ease);
  box-shadow: none;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  white-space: nowrap;
  user-select: none;
}
.btn { min-height: 36px; padding: 0 16px; font-size: 14px; }
.btn-sm { min-height: 32px; padding: 0 12px; font-size: 13px; }
.btn:active { transform: scale(.98); }

/* 主按钮：品牌实色 */
.btn-primary {
  background: var(--ui-primary) !important;
  border-color: var(--ui-primary) !important;
  color: #fff !important;
}
.btn-primary:hover {
  background: var(--ui-primary-hover) !important;
  border-color: var(--ui-primary-hover) !important;
}
/* 成功 / 危险实色，略降饱和、面积克制 */
.btn-success {
  background: var(--ui-success) !important;
  border-color: var(--ui-success) !important;
  color: #fff !important;
}
.btn-success:hover { filter: brightness(.96); }
.btn-danger {
  background: var(--ui-danger) !important;
  border-color: var(--ui-danger) !important;
  color: #fff !important;
}
.btn-danger:hover { filter: brightness(.95); }

/* 次按钮：白底灰边 */
.btn-outline {
  background: #fff !important;
  color: var(--ui-fg) !important;
  border: 1px solid var(--ui-border-strong) !important;
}
.btn-outline:hover {
  background: var(--ui-muted) !important;
  border-color: var(--ui-border-strong) !important;
}

/* 文字 / ghost 按钮：透明底，hover 浅灰 */
.btn-text, .btn-ghost {
  background: transparent !important;
  color: var(--ui-fg-2) !important;
  border-color: transparent !important;
  box-shadow: none !important;
}
.btn-text:hover, .btn-ghost:hover {
  background: var(--ui-muted) !important;
  color: var(--ui-fg) !important;
  transform: none !important;
}
.btn:disabled, .btn[disabled] {
  opacity: .5;
  cursor: not-allowed;
  pointer-events: none;
}

/* hover 统一柔和：不再整排上浮，仅主操作轻微 */
.btn:hover { transform: translateY(0); }
.btn-primary:hover, .btn-success:hover, .btn-danger:hover { transform: translateY(-1px); }

/* =============================================================
   输入 / 选择 / 文本域 Input
   ============================================================= */
.form-input, input[type="text"], input[type="password"],
input[type="email"], input[type="number"], input[type="search"],
input[type="tel"], select, textarea,
.filter-bar input, .filter-bar select, .form-select {
  border: 1px solid var(--ui-input);
  border-radius: var(--ui-radius);
  background: #fff;
  color: var(--ui-fg);
  font-size: 14px;
  transition: border-color var(--ui-ease), box-shadow var(--ui-ease);
  box-shadow: none;
}
.form-input, input[type="text"], input[type="password"],
input[type="email"], input[type="number"], input[type="search"],
input[type="tel"], select { min-height: 36px; }
textarea { padding: 8px 12px; }
.form-input::placeholder, input::placeholder, textarea::placeholder {
  color: var(--ui-fg-3);
}
.form-input:focus, input:focus, select:focus, textarea:focus,
.filter-bar .form-input:focus, .filter-bar select:focus, .filter-bar input:focus {
  outline: none;
  border-color: var(--ui-primary);
  box-shadow: 0 0 0 3px var(--ui-ring) !important;
}
select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748B' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 32px;
}

/* 复选框 / 单选框 */
input[type="checkbox"], input[type="radio"] {
  width: 16px; height: 16px;
  accent-color: var(--ui-primary);
  cursor: pointer;
}

/* =============================================================
   表格 Table
   ============================================================= */
.table-container, .table-wrapper {
  padding: 4px;
  overflow: hidden;
}
.data-table, table.data-table {
  border-collapse: separate;
  border-spacing: 0;
  width: 100%;
}
.data-table thead th, .data-table th {
  background: var(--ui-muted) !important;
  color: var(--ui-fg-2) !important;
  font-weight: 600 !important;
  font-size: 12.5px !important;
  letter-spacing: .01em;
  text-transform: none;
  border-bottom: 1px solid var(--ui-border) !important;
  padding: 11px 16px !important;
  white-space: nowrap;
}
.data-table tbody td {
  padding: 12px 16px !important;
  border-bottom: 1px solid hsl(214 32% 95%) !important;
  color: var(--ui-fg);
  font-size: 14px;
  vertical-align: middle;
}
.data-table tbody tr:last-child td { border-bottom: none !important; }
.data-table tbody tr { transition: background-color var(--ui-ease); }
.data-table tbody tr:hover td { background: hsl(214 95% 98%) !important; }
.data-table tbody tr.row-graduated td { color: var(--ui-fg-3); }
.data-table tbody tr.row-graduated:hover td { background: var(--ui-muted) !important; }

/* =============================================================
   弹窗 Modal / Dialog
   ============================================================= */
.modal-overlay {
  background: hsl(222 47% 11% / .45) !important;
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  animation: uiFade .15s ease;
}
.modal, .form-modal, .login-modal {
  background: var(--ui-card);
  border: 1px solid var(--ui-border);
  border-radius: var(--ui-radius-lg) !important;
  box-shadow: var(--ui-shadow-modal) !important;
  animation: uiPop .18s cubic-bezier(.16,1,.3,1);
}
.modal-header, .form-modal-header {
  padding: 20px 24px 0;
  border-bottom: none;
}
.modal-header h3, .form-modal-header h3,
.modal-title, .form-modal-title {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--ui-fg);
}
.modal-body, .form-modal-body { padding: 20px 24px; }
.modal-footer, .form-modal-footer {
  padding: 16px 24px 20px;
  border-top: 1px solid var(--ui-border);
  background: transparent;
}
.modal-close {
  width: 32px; height: 32px;
  border-radius: var(--ui-radius);
  color: var(--ui-fg-2);
  transition: background-color var(--ui-ease), color var(--ui-ease);
  display: inline-flex; align-items: center; justify-content: center;
}
.modal-close:hover { background: var(--ui-muted); color: var(--ui-fg); }

@keyframes uiFade { from { opacity: 0; } to { opacity: 1; } }
@keyframes uiPop {
  from { opacity: 0; transform: translateY(8px) scale(.985); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* =============================================================
   Toast（白底深字 + 语义色点缀，shadcn sonner 风格）
   ============================================================= */
.toast {
  background: var(--ui-card) !important;
  color: var(--ui-fg) !important;
  border: 1px solid var(--ui-border);
  border-left: 3px solid var(--ui-fg-3);
  border-radius: 10px !important;
  box-shadow: var(--ui-shadow-modal) !important;
  font-weight: 500;
  padding: 12px 18px;
}
.toast.success { border-left-color: var(--ui-success); }
.toast.error   { border-left-color: var(--ui-danger); }
.toast.warning { border-left-color: var(--ui-warning); }

/* =============================================================
   状态标签 / 徽章 Badge（浅底胶囊）
   ============================================================= */
.tag, .badge, .status-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 12px;
  line-height: 1;
  padding: 4px 10px;
  border: 1px solid transparent;
}
.status-ongoing, .badge-success, .tag-success {
  background: hsl(142 71% 95%); color: hsl(142 64% 32%);
  border-color: hsl(142 71% 88%);
}
.status-graduated, .badge-muted, .tag-muted {
  background: var(--ui-muted); color: var(--ui-fg-2);
  border-color: var(--ui-border);
}
.enroll-chip {
  background: var(--ui-primary-soft) !important;
  color: var(--ui-primary-hover) !important;
  border-radius: 999px !important;
  font-size: 12px !important;
  font-weight: 600;
  border: 1px solid hsl(214 95% 90%) !important;
  padding: 3px 10px !important;
}

/* 学科色标签统一为浅底彩字（更克制） */
.subject-tag, .subj-badge, .subj-tag {
  border-radius: 6px;
  font-weight: 600;
  font-size: 12px;
  padding: 3px 9px;
}

/* =============================================================
   筛选栏
   ============================================================= */
.filter-bar {
  padding: 16px 18px;
  margin-bottom: 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
.filter-bar .form-input, .filter-bar select, .filter-bar input {
  min-height: 36px;
}

/* =============================================================
   侧边栏导航（保留深色角色识别，激活项更精致）
   ============================================================= */
.nav-item {
  border-radius: var(--ui-radius);
  transition: background-color var(--ui-ease), color var(--ui-ease);
  margin: 2px 10px;
}
.sidebar-admin .nav-item.active,
.sidebar-teacher .nav-item.active,
.sidebar-student .nav-item.active {
  box-shadow: none !important;
  font-weight: 600;
}
.sidebar .nav-item:not(.active):hover { background: rgba(255,255,255,.08); }

/* =============================================================
   分页 Pagination
   ============================================================= */
.pager-btn, .page-btn {
  min-width: 32px; height: 32px;
  border-radius: var(--ui-radius) !important;
  border: 1px solid var(--ui-border);
  background: #fff;
  color: var(--ui-fg-2);
  font-size: 13px;
  display: inline-flex; align-items: center; justify-content: center;
  transition: background-color var(--ui-ease), border-color var(--ui-ease), color var(--ui-ease);
}
.pager-btn:hover:not([disabled]):not(.active),
.page-btn:hover:not([disabled]):not(.active) {
  background: var(--ui-muted) !important;
  border-color: var(--ui-border-strong);
}
.pager-btn.active, .page-btn.active {
  background: var(--ui-primary) !important;
  border-color: var(--ui-primary) !important;
  color: #fff !important;
}
.pager-btn[disabled] { opacity: .45; cursor: not-allowed; }

/* =============================================================
   Loading：统一轻量 spinner
   ============================================================= */
.ui-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--ui-fg-2);
  font-size: 13px;
  min-height: 120px;
}
.ui-spinner {
  width: 28px; height: 28px;
  border: 3px solid var(--ui-border);
  border-top-color: var(--ui-primary);
  border-radius: 50%;
  animation: uiSpin .7s linear infinite;
}
@keyframes uiSpin { to { transform: rotate(360deg); } }

/* 全局遮罩 loading（app.js #global-loading-mask） */
#global-loading-mask {
  background: hsl(222 47% 11% / .30);
  backdrop-filter: blur(2px);
}

/* =============================================================
   信息层级：弱化次要说明文字
   ============================================================= */
.page-desc, .form-hint, .hint, .muted, .text-muted,
.modal-body .tip, .tip-text, .empty-desc, .sub-text {
  color: var(--ui-fg-2);
}
.page-title, .page-header h2 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--ui-fg);
}

/* 空状态 */
.empty-state, .empty, .no-data {
  color: var(--ui-fg-2);
  padding: 40px 20px;
  text-align: center;
}

/* =============================================================
   登录页（保留品牌渐变背景，卡片做 shadcn 质感精修）
   ============================================================= */
.login-card {
  border: 1px solid rgba(255,255,255,.6) !important;
  border-radius: var(--ui-radius-lg) !important;
  box-shadow: 0 8px 30px rgba(15,23,42,.10);
  transition: transform var(--ui-ease), box-shadow var(--ui-ease), border-color var(--ui-ease);
}
.login-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(15,23,42,.16);
}
.login-card-icon { border-radius: 14px; }
.login-card-btn {
  border-radius: var(--ui-radius) !important;
  font-weight: 600;
  transition: background-color var(--ui-ease);
}

/* =============================================================
   响应式（<768px 手机端）
   ============================================================= */
@media (max-width: 767px) {
  html, body { overflow-x: hidden; max-width: 100%; }
  .main-content { padding: 16px !important; width: 100% !important; max-width: 100% !important; }
  .card, .stat-card, .metric-card, .filter-bar,
  .table-container, .table-wrapper, .panel {
    border-radius: 10px;
  }
  .stat-cards, .stats-grid, .stat-grid { gap: 12px; }
  .page-title { font-size: 19px; }
  .filter-bar { padding: 12px; gap: 8px; }
  .modal, .form-modal { width: 92vw !important; max-width: 92vw !important; }
  .modal-body, .form-modal-body { padding: 16px; }
  .modal-header, .form-modal-header { padding: 16px 16px 0; }
  .modal-footer, .form-modal-footer { padding: 14px 16px 16px; }
  .btn { min-height: 40px; }
  .btn-sm { min-height: 36px; }
  /* 登录页手机端纵向堆叠 */
  .login-cards { grid-template-columns: 1fr !important; gap: 14px !important; margin-bottom: 24px !important; }
  .login-card { padding: 24px 18px !important; }
  .login-header { margin-bottom: 28px !important; }
  .login-title { font-size: 32px !important; }
  /* 触屏禁用 hover 位移/阴影，避免残留高亮 */
  .card:hover, .stat-card:hover, .btn:hover {
    transform: none !important;
    box-shadow: var(--ui-shadow-sm);
  }
  /* 表格外层横向滚动，页内不出现整页横向滚动 */
  .table-container, .table-wrapper { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .data-table { min-width: 560px; }
}