:root {
  --ui-primary: #165dff;
  --ui-primary-strong: #0f49d8;
  --ui-primary-soft: #edf3ff;
  --ui-ink: #172033;
  --ui-muted: #667085;
  --ui-line: #e5eaf2;
  --ui-paper: #ffffff;
  --ui-canvas: #f5f7fb;
  --ui-success: #12a06a;
  --ui-warning: #e58a00;
  --ui-danger: #d93f53;
  --ui-radius: 14px;
  --ui-shadow: 0 8px 28px rgba(30, 50, 90, .055);
  --ui-font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --ui-font-display: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
}

.tiku-ui {
  background: var(--ui-canvas);
  color: var(--ui-ink);
  font-family: var(--ui-font-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.tiku-ui *, .tiku-ui *::before, .tiku-ui *::after { box-sizing: border-box; }
.tiku-ui [hidden], .tiku-ui .hidden { display: none !important; }
.tiku-ui button, .tiku-ui a, .tiku-ui input, .tiku-ui select, .tiku-ui textarea { -webkit-tap-highlight-color: transparent; }
.tiku-ui button, .tiku-ui a { touch-action: manipulation; }
.tiku-ui button:focus-visible,
.tiku-ui a:focus-visible,
.tiku-ui [role="button"]:focus-visible,
.tiku-ui input:focus-visible,
.tiku-ui select:focus-visible,
.tiku-ui textarea:focus-visible,
.tiku-ui summary:focus-visible,
.tiku-ui [role="button"]:focus-visible {
  outline: 3px solid rgba(22, 93, 255, .24);
  outline-offset: 2px;
}

.tiku-ui .ui-display {
  font-family: var(--ui-font-display);
  font-weight: 700;
  letter-spacing: .02em;
}

.tiku-ui .ui-number { font-variant-numeric: tabular-nums; }

.tiku-ui .card,
.tiku-ui .card-shadow {
  border: 1px solid var(--ui-line);
  box-shadow: var(--ui-shadow);
}

.tiku-ui .ui-btn {
  min-height: 44px;
  border-radius: 11px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-weight: 600;
  line-height: 1.25;
  transition: transform .16s ease, box-shadow .16s ease, background-color .16s ease, border-color .16s ease;
}

.tiku-ui .ui-btn:hover { transform: translateY(-1px); }
.tiku-ui .ui-btn:active { transform: translateY(0); }
.tiku-ui .ui-btn:disabled { cursor: not-allowed; opacity: .55; transform: none; box-shadow: none; }
.tiku-ui .ui-btn--primary { color: #fff; background: var(--ui-primary); box-shadow: 0 8px 18px rgba(22, 93, 255, .2); }
.tiku-ui .ui-btn--primary:hover { background: var(--ui-primary-strong); }
.tiku-ui .ui-btn--secondary { color: var(--ui-primary); border: 1px solid #cbd9ff; background: #f7f9ff; }
.tiku-ui .ui-btn--secondary:hover { border-color: #9eb7ff; background: #eef3ff; }
.tiku-ui .ui-btn--quiet { color: var(--ui-muted); border: 1px solid var(--ui-line); background: #fff; }

.tiku-ui .ui-icon-btn {
  display: inline-flex;
  width: 40px;
  height: 40px;
  min-width: 40px;
  align-items: center;
  justify-content: center;
  border-radius: 11px;
}

/* AI 工具页共用的移动页头。标题保留，流程副标题在窄屏隐藏，
   操作区独立成行，避免中文按钮被压成竖排。 */
.tiku-admin-tool .tool-header-inner { min-width: 0; }
.tiku-admin-tool .tool-header-brand { min-width: 0; }
.tiku-admin-tool .tool-header-copy { min-width: 0; }
.tiku-admin-tool .tool-header-actions { flex: none; }

@media (max-width: 640px) {
  .tiku-admin-tool .tool-header-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 10px;
    padding-top: 10px;
    padding-bottom: 10px;
  }
  .tiku-admin-tool .tool-header-subtitle { display: none; }
  .tiku-admin-tool .tool-header-actions { gap: 6px; }
  .tiku-admin-tool .tool-header-actions .btn {
    min-width: 44px;
    min-height: 44px;
    padding: 9px 11px;
    white-space: nowrap;
  }
  .tiku-admin-tool .tool-header-actions .btn-label { display: none; }
  .tiku-admin-tool .toast {
    top: auto;
    right: 12px;
    bottom: calc(16px + env(safe-area-inset-bottom));
    left: 12px;
    max-width: none;
  }
}

.tiku-ui input:not([type="checkbox"]):not([type="radio"]),
.tiku-ui select,
.tiku-ui textarea {
  border-color: #dce2ec;
  background: #fff;
  color: var(--ui-ink);
  transition: border-color .16s ease, box-shadow .16s ease;
}

.tiku-ui input:not([type="checkbox"]):not([type="radio"]):focus,
.tiku-ui select:focus,
.tiku-ui textarea:focus {
  border-color: var(--ui-primary) !important;
  outline: 0;
  box-shadow: 0 0 0 3px rgba(22, 93, 255, .12);
}

/* Native range controls are used on data-heavy teacher views. The visible
   rail stays precise while the element keeps a comfortable touch target. */
.tiku-ui input[type="range"].ui-range {
  width: 100%;
  height: 40px;
  margin: 0;
  padding: 0;
  appearance: none;
  -webkit-appearance: none;
  cursor: grab;
  background: transparent;
  touch-action: pan-x;
}
.tiku-ui input[type="range"].ui-range:active { cursor: grabbing; }
.tiku-ui input[type="range"].ui-range::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(90deg, #b9cbff, #e8eefb);
  box-shadow: inset 0 0 0 1px rgba(22, 93, 255, .08);
}
.tiku-ui input[type="range"].ui-range::-webkit-slider-thumb {
  width: 24px;
  height: 24px;
  margin-top: -9px;
  border: 4px solid #fff;
  border-radius: 50%;
  appearance: none;
  -webkit-appearance: none;
  background: var(--ui-primary);
  box-shadow: 0 2px 10px rgba(22, 93, 255, .34);
}
.tiku-ui input[type="range"].ui-range::-moz-range-track {
  height: 6px;
  border: 0;
  border-radius: 999px;
  background: #dce6fb;
}
.tiku-ui input[type="range"].ui-range::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: 4px solid #fff;
  border-radius: 50%;
  background: var(--ui-primary);
  box-shadow: 0 2px 10px rgba(22, 93, 255, .34);
}

.tiku-ui .ui-range-shell {
  margin-top: 10px;
  padding: 8px 12px 7px;
  border: 1px solid #dfe7f5;
  border-radius: 12px;
  background: #f8faff;
}
.tiku-ui .ui-range-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  color: var(--ui-muted);
  font-size: 11px;
}
.tiku-ui .ui-range-window {
  color: #244dba;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
}

.tiku-ui .ui-modal-backdrop {
  overscroll-behavior: contain;
  animation: ui-fade-in .18s ease-out both;
}
.tiku-ui .ui-modal-panel { animation: ui-panel-in .22s cubic-bezier(.2,.8,.2,1) both; }
body.ui-modal-open { overflow: hidden; }
@keyframes ui-fade-in { from { opacity: 0; } }
@keyframes ui-panel-in { from { opacity: 0; transform: translateY(10px) scale(.985); } }

.tiku-home #coreFunction > div {
  border: 1px solid var(--ui-line);
  box-shadow: 0 8px 26px rgba(30, 50, 90, .05);
}

.tiku-home #coreFunction > div:hover {
  border-color: #cbd9ff;
  box-shadow: 0 12px 30px rgba(22, 93, 255, .09);
  transform: translateY(-2px);
}

.tiku-home #assignmentNoticeModal > div {
  border: 1px solid rgba(255,255,255,.5);
  box-shadow: 0 28px 80px rgba(11, 25, 55, .25);
}

.tiku-home #assignmentNoticeModal button {
  min-height: 44px;
  border-radius: 11px;
  font-weight: 600;
}

.tiku-classroom header {
  border-bottom: 1px solid var(--ui-line);
  box-shadow: none !important;
}

.tiku-classroom #newAssignModal { backdrop-filter: blur(3px); }
.tiku-classroom #newAssignModal > div {
  border: 1px solid rgba(255,255,255,.65);
  box-shadow: 0 28px 90px rgba(11, 25, 55, .26);
}

.tiku-classroom #newAssignModal button {
  min-height: 40px;
  line-height: 1.25;
}

.tiku-classroom #newAssignModal #assignPublishBtn {
  box-shadow: 0 8px 18px rgba(22, 93, 255, .2);
}

.tiku-classroom #newAssignModal #assignRecurringPanel .bg-purple-600,
.tiku-classroom #newAssignModal #assignRecurringKnowledgePlan .bg-purple-600 {
  background: var(--ui-primary) !important;
}

.tiku-classroom #newAssignModal #assignRecurringKnowledgePlan {
  border-color: #dbe4ff;
  background: #f6f8ff;
}

.tiku-classroom #newAssignModal #assignRecurrenceSummary,
.tiku-classroom #newAssignModal #assignSequencePreview {
  color: #244dba;
}

@media (max-width: 640px) {
  .tiku-home #assignmentNoticeModal { align-items: flex-end; padding: 0; }
  .tiku-home #assignmentNoticeModal > div { max-width: none; border-radius: 22px 22px 0 0; }
  .tiku-home #assignmentNoticeModal .grid-cols-2 { grid-template-columns: 1fr; }
  .tiku-home #assignmentNoticeModal .grid-cols-2 button.bg-primary { order: -1; }

  .tiku-classroom #newAssignModal { align-items: flex-end; padding: 0; }
  .tiku-classroom #newAssignModal > div {
    height: 96dvh !important;
    max-height: none !important;
    border-radius: 22px 22px 0 0;
  }
  .tiku-classroom #newAssignModal #assignRuleOptions { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tiku-classroom #newAssignModal #assignRuleOptions label:last-child { grid-column: 1 / -1; }

  .tiku-ui .ui-modal-panel { animation-name: ui-sheet-in; }
  .tiku-ui .ui-icon-btn { width: 44px; height: 44px; min-width: 44px; }
}

@keyframes ui-sheet-in { from { opacity: 0; transform: translateY(28px); } }

@media (prefers-reduced-motion: reduce) {
  body.tiku-ui { animation: none !important; }
  .tiku-ui *, .tiku-ui *::before, .tiku-ui *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* ── 题干里的表格（OCR 导入的会计报表等）─────────────────────────────
   tailwind 的 preflight 把所有元素 border-width 归零，连 HTML 的 border="1"
   属性也被覆盖，所以含 <table> 的题目在网页端（学生端与后台预览）实测边框
   0px、padding 1px，整张表糊成一片（2026-08-17 在线上真实 CSS 环境里量过）。

   选择器用 table[border] 而不是题干容器 class：服务端消毒器（
   security_utils.RICH_TEXT_ATTRIBUTES）只放行 table 的 border 属性，所以库里
   的题干表格一律带 border="1"，而后台各处的布局表格都不带这个属性——这样既
   全站覆盖题干表格，又不会误伤任何列表布局（已在线上逐项验证）。
   视觉与小程序端保持一致：表头底色 + 隔行斑马纹 + 单元格内边距。 */
table[border] { border-collapse: collapse; margin: 12px 0; font-size: 14px; line-height: 1.6; }
table[border] td,
table[border] th { border: 1px solid #c3cddb; padding: 6px 10px; text-align: center; }
table[border] tr:first-child td,
table[border] thead td,
table[border] th { background: #dce6f5; font-weight: 600; }
table[border] tbody tr:nth-child(even) td { background: #f2f6fc; }
/* 窄屏（老师用手机看后台、学生用网页端）宽表格可横向滑动，不压缩数字 */
@media (max-width: 640px) {
  table[border] { display: block; overflow-x: auto; white-space: nowrap; }
}