:root {
  /* 宣纸与书卷纸张色彩体系 */
  --paper: #f4f1ea;
  --paper-warm: #f8f6f0;
  --paper-deep: #ebe7de;
  --paper-card: rgba(255, 255, 255, 0.78);
  --paper-card-hover: rgba(255, 255, 255, 0.96);
  --paper-surface: #faf9f5;
  
  /* 墨黑与辅助文本 */
  --ink: #17211d;
  --ink-light: #37443e;
  --muted: #66726c;
  --muted-light: #8e9a93;
  
  /* 师者专属雅致色彩 */
  --jade: #165542;
  --jade-dark: #0f3d2f;
  --jade-hover: #1b6650;
  --jade-soft: #e2ece6;
  --jade-border: rgba(22, 85, 66, 0.22);
  
  --orange: #c95321;
  --orange-dark: #9e3d14;
  --orange-soft: #fbeee8;
  --orange-border: rgba(201, 83, 33, 0.25);
  
  --amber: #b87b18;
  --amber-soft: #fcf4e6;
  --amber-border: rgba(184, 123, 24, 0.25);
  
  --indigo: #295270;
  --indigo-soft: #e9f0f5;
  --indigo-border: rgba(41, 82, 112, 0.25);
  
  --purple: #6a4c7d;
  --purple-soft: #f2edf7;
  --purple-border: rgba(106, 76, 125, 0.25);
  
  /* 细线条与分割 */
  --line: rgba(28, 39, 34, 0.13);
  --line-light: rgba(28, 39, 34, 0.07);
  --line-strong: rgba(28, 39, 34, 0.24);
  
  /* 圆角与阴影 */
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 2px 6px rgba(28, 39, 34, 0.04);
  --shadow: 0 8px 24px rgba(28, 39, 34, 0.06), 0 2px 6px rgba(28, 39, 34, 0.03);
  --shadow-lg: 0 16px 40px rgba(28, 39, 34, 0.10), 0 4px 12px rgba(28, 39, 34, 0.05);
  --shadow-float: 0 20px 48px rgba(18, 30, 24, 0.16), 0 6px 16px rgba(18, 30, 24, 0.06);
  
  /* 弹性动效曲线与持续时间 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 140ms;
  --duration-normal: 220ms;
  --duration-slow: 360ms;

  /* 字体栈 */
  --sans: "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --serif: "Songti SC", "Noto Serif CJK SC", SimSun, "STSong", Georgia, serif;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--paper);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* 优雅自定义细滚动条 */
::-webkit-scrollbar {
  width: 7px;
  height: 7px;
}

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

::-webkit-scrollbar-thumb {
  background: rgba(28, 39, 34, 0.16);
  border-radius: var(--radius-full);
  transition: background var(--duration-fast) ease;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(22, 85, 66, 0.38);
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font: 15px/1.65 var(--sans);
  background: var(--paper) url('../img/paper-texture.png') repeat;
  background-size: 680px 680px;
  background-attachment: fixed;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--duration-fast) ease, opacity var(--duration-fast) ease;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button, summary {
  cursor: pointer;
  user-select: none;
}

:focus-visible {
  outline: 2px solid var(--jade);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(22, 85, 66, 0.14);
}

/* ==========================================================================
   顶栏与主导航 (Site Header & Topbar)
   ========================================================================== */
.site-header {
  height: 64px;
  padding: 0 36px;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  background: rgba(244, 241, 234, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  position: sticky;
  top: 0;
  z-index: 40;
  transition: background var(--duration-normal) ease, border-color var(--duration-normal) ease;
}

.brand-wrapper {
  display: flex;
  align-items: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font: 600 19px/1 var(--serif);
  color: var(--ink);
  letter-spacing: 0.08em;
  text-decoration: none;
}

.brand-mark {
  display: block;
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  object-fit: contain;
  transition: transform var(--duration-fast) var(--ease-out);
}

.brand:hover .brand-mark {
  transform: scale(1.06);
}

.brand-name {
  font-weight: 600;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.primary-nav a,
.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-size: 14px;
  font-weight: 550;
  text-decoration: none;
  transition: color var(--duration-fast) ease, background var(--duration-fast) ease, transform var(--duration-fast) var(--ease-out);
}

.primary-nav a:hover,
.nav-link:hover {
  color: var(--ink);
  background: var(--paper-deep);
  transform: translateY(-1px);
}

.primary-nav a.active,
.nav-link.active {
  color: var(--jade-dark);
  background: var(--jade-soft);
  font-weight: 650;
  box-shadow: inset 0 0 0 1px var(--jade-border);
}

.header-right,
.header-tools {
  display: flex;
  align-items: center;
  gap: 12px;
}

.quick-search-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-full);
  background: #fff;
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all var(--duration-fast) var(--ease-out);
}

.quick-search-trigger:hover {
  background: #fff;
  border-color: var(--jade);
  color: var(--jade-dark);
  transform: translateY(-1.5px);
  box-shadow: var(--shadow);
}

.quick-search-trigger kbd,
.search-kbd-tag {
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--paper-deep);
  color: var(--ink-light);
  font-family: monospace;
  font-weight: 600;
}

/* 账号下拉菜单 (Account Menu) */
.account-menu {
  position: relative;
}

.account-menu summary {
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--line-strong);
  background: #fff;
  color: var(--ink);
  font-size: 13.5px;
  font-weight: 550;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all var(--duration-fast) var(--ease-out);
}

.account-menu summary::-webkit-details-marker {
  display: none;
}

.account-menu summary::before {
  content: "师";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--jade);
  color: #fff;
  font: 600 11px/22px var(--serif);
}

.account-menu summary::after {
  content: "▾";
  font-size: 11px;
  color: var(--muted);
  margin-left: 2px;
}

.account-menu summary:hover,
.account-menu[open] summary {
  border-color: var(--jade);
  transform: translateY(-1.5px);
  box-shadow: var(--shadow);
}

.menu-popover {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  width: 210px;
  padding: 8px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-float);
  z-index: 60;
  display: grid;
  gap: 2px;
  animation: popover-fade 0.18s var(--ease-out);
}

@keyframes popover-fade {
  from { opacity: 0; transform: translateY(-6px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.menu-group-title {
  font-size: 11px;
  color: var(--muted);
  font-weight: 650;
  padding: 6px 12px 2px;
  letter-spacing: 0.05em;
}

.menu-popover a,
.menu-popover button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--ink-light);
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  transition: all var(--duration-fast) ease;
}

.menu-popover a:hover,
.menu-popover button:hover {
  background: var(--jade-soft);
  color: var(--jade-dark);
}

.menu-popover hr {
  margin: 4px 0;
  border: none;
  border-top: 1px solid var(--line-light);
}

.teacher-profile-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: var(--paper-warm);
  border: 1px solid var(--line);
  font-size: 13.5px;
  color: var(--ink);
  transition: all var(--duration-fast) var(--ease-out);
}

.teacher-profile-link:hover {
  background: #fff;
  border-color: var(--jade-border);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.profile-avatar-seal {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--jade);
  color: #fff;
  font: 600 11px/22px var(--serif);
  text-align: center;
}

.teacher-profile-link:hover {
  background: #fff;
  border-color: var(--jade-border);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.profile-avatar-seal {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--jade);
  color: #fff;
  font: 600 11px/22px var(--serif);
  text-align: center;
}

/* ==========================================================================
   页面容器与排版 (Page Layout)
   ========================================================================== */
.page-shell {
  width: min(1280px, calc(100% - 48px));
  margin: 0 auto;
  padding: 32px 0 60px;
  flex: 1;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.eyebrow {
  margin: 0;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--jade);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.page-header h1 {
  margin: 4px 0 0;
  font: 500 clamp(26px, 2.8vw, 36px)/1.2 var(--serif);
  color: var(--ink);
}

.page-header p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14px;
  max-width: 680px;
}

.page-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* 通用面板卡片 (Panel) */
.panel {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-card);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: box-shadow var(--duration-fast) ease, border-color var(--duration-fast) ease, transform var(--duration-fast) var(--ease-out);
}

.panel:hover {
  box-shadow: var(--shadow);
  border-color: rgba(22, 85, 66, 0.18);
}

/* 内容双栏布局 (Content Sidebar) */
.content-sidebar {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(320px, 1fr);
  gap: 24px;
  align-items: start;
}

.two-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

/* ==========================================================================
   按钮与交互控件 (Buttons & Inputs)
   ========================================================================== */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  background: #fff;
  color: var(--ink);
  font-size: 13.5px;
  font-weight: 550;
  line-height: 1.4;
  box-shadow: var(--shadow-sm);
  transition: all var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.button:hover {
  border-color: var(--jade);
  color: var(--jade-dark);
  transform: translateY(-1.5px);
  box-shadow: var(--shadow);
}

.button:active {
  transform: translateY(0) scale(0.98);
}

.button.primary {
  background: var(--jade);
  border-color: var(--jade);
  color: #fff;
  box-shadow: 0 2px 8px rgba(22, 85, 66, 0.2);
}

.button.primary:hover {
  background: var(--jade-hover);
  border-color: var(--jade-hover);
  color: #fff;
  box-shadow: 0 4px 14px rgba(22, 85, 66, 0.28);
}

.button.danger {
  background: var(--orange-soft);
  border-color: var(--orange-border);
  color: var(--orange-dark);
}

.button.danger:hover {
  background: var(--orange);
  border-color: var(--orange);
  color: #fff;
}

.button.small {
  padding: 4px 10px;
  font-size: 12px;
}

.link-button {
  background: none;
  border: none;
  padding: 0;
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
  transition: color var(--duration-fast) ease;
}

.link-button:hover {
  color: var(--orange);
}

/* ==========================================================================
   功能性表单控件 (Functional Form Elements)
   ========================================================================== */
.stack-form {
  display: grid;
  gap: 16px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
}

.field {
  display: grid;
  gap: 6px;
}

.field > span {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-light);
  display: flex;
  align-items: center;
}

.field > span b {
  color: var(--orange);
  margin-left: 2px;
}

.field input,
.field select,
.field textarea,
input[type="search"],
input[type="text"],
input[type="date"],
input[type="datetime-local"],
input[type="number"],
input[type="password"],
textarea,
select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--ink);
  font-size: 14px;
  box-shadow: inset 0 1px 2px rgba(28, 39, 34, 0.03);
  transition: border-color var(--duration-fast) ease, box-shadow var(--duration-fast) ease, background var(--duration-fast) ease;
}

.field input:focus,
.field select:focus,
.field textarea:focus,
input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--jade);
  box-shadow: 0 0 0 3.5px rgba(22, 85, 66, 0.14);
  background: #fff;
}

.field input:disabled,
.field select:disabled,
.field textarea:disabled {
  background: var(--paper-deep);
  opacity: 0.6;
  cursor: not-allowed;
}

textarea {
  resize: vertical;
  min-height: 84px;
  line-height: 1.6;
}

.check, .radio {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: var(--ink-light);
  cursor: pointer;
  user-select: none;
}

.check input, .radio input {
  width: 16px;
  height: 16px;
  accent-color: var(--jade);
  cursor: pointer;
}

/* ==========================================================================
   功能性数据表格 (Data-Dense Functional Tables)
   ========================================================================== */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  scrollbar-width: thin;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: #fff;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 13.5px;
}

.data-table thead th {
  padding: 12px 16px;
  background: var(--paper-surface);
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.04em;
  border-bottom: 2px solid var(--line);
  white-space: nowrap;
  position: sticky;
  top: 0;
  z-index: 5;
}

.data-table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line-light);
  color: var(--ink);
  transition: background var(--duration-fast) ease;
}

.data-table tbody tr:hover td {
  background: rgba(226, 236, 230, 0.3);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

/* ==========================================================================
   药丸微章 (Pills & Badges)
   ========================================================================== */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 11.5px;
  font-weight: 600;
  line-height: 1.35;
  white-space: nowrap;
}

.pill.primary { background: var(--jade-soft); color: var(--jade-dark); }
.pill.urgent { background: var(--orange-soft); color: var(--orange-dark); }
.pill.amber { background: var(--amber-soft); color: var(--amber); }
.pill.indigo { background: var(--indigo-soft); color: var(--indigo); }
.pill.purple { background: var(--purple-soft); color: var(--purple); }
.pill.neutral { background: var(--paper-deep); color: var(--muted); }

/* 统计卡片条 (Stats Row) */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat {
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-card);
  box-shadow: var(--shadow-sm);
  display: grid;
  gap: 4px;
  transition: transform var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) ease;
}

.stat:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  background: #fff;
}

.stat span {
  font-size: 12px;
  color: var(--muted);
}

.stat strong {
  font: 500 28px/1 var(--serif);
  color: var(--jade-dark);
  font-variant-numeric: tabular-nums;
}

/* 选项卡 (Tabs) */
.tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.tabs a {
  padding: 8px 16px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  color: var(--muted);
  font-size: 14px;
  font-weight: 550;
  transition: all var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.tabs a:hover {
  color: var(--ink);
  background: var(--paper-deep);
}

.tabs a.active {
  color: var(--jade-dark);
  background: #fff;
  border: 1px solid var(--line);
  border-bottom-color: #fff;
  margin-bottom: -1px;
  box-shadow: var(--shadow-sm);
}

/* 空状态卡片 (Empty State) */
.empty-card {
  padding: 48px 24px;
  border: 1.5px dashed var(--line-strong);
  border-radius: var(--radius);
  background: var(--paper-card);
  text-align: center;
  display: grid;
  place-items: center;
  gap: 8px;
}

.empty-card strong {
  font: 500 18px var(--serif);
  color: var(--ink);
}

.empty-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13.5px;
  max-width: 440px;
}

/* 闪现提示信息 (Flash Messages: Success / Error / Warning / Info) */
.flash-stack {
  display: grid;
  gap: 10px;
  margin-bottom: 24px;
}

.flash {
  padding: 13px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 550;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  animation: flash-slide-in 0.24s var(--ease-out);
  position: relative;
  overflow: hidden;
}

@keyframes flash-slide-in {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.flash.success,
.flash.flash-success,
.flash-success {
  background: var(--jade-soft);
  color: var(--jade-dark);
  border: 1px solid var(--jade-border);
  border-left: 4px solid var(--jade);
  box-shadow: 0 2px 8px rgba(22, 85, 66, 0.08);
}

.flash.error,
.flash.danger,
.flash.flash-error,
.flash.flash-danger,
.flash-error,
.flash-danger {
  background: var(--orange-soft);
  color: var(--orange-dark);
  border: 1px solid var(--orange-border);
  border-left: 4px solid var(--orange);
  box-shadow: 0 2px 8px rgba(201, 83, 33, 0.08);
}

.flash.warning,
.flash.flash-warning,
.flash-warning {
  background: var(--amber-soft);
  color: var(--amber);
  border: 1px solid var(--amber-border);
  border-left: 4px solid var(--amber);
  box-shadow: 0 2px 8px rgba(184, 123, 24, 0.08);
}

.flash.info,
.flash.flash-info,
.flash-info {
  background: var(--indigo-soft);
  color: var(--indigo);
  border: 1px solid var(--indigo-border);
  border-left: 4px solid var(--indigo);
  box-shadow: 0 2px 8px rgba(41, 82, 112, 0.08);
}

/* 纯装饰性与无障碍辅助元素 (Aria-Hidden & Decorative Accessibility) */
[aria-hidden="true"] {
  user-select: none;
  -webkit-user-select: none;
}

.seal-mark[aria-hidden="true"],
.meeting-seal-mark[aria-hidden="true"],
.brand-mark {
  flex-shrink: 0;
}

.visually-hidden,
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* 常驻浮动操作组 (Floating Tools: 记 & 撤销) */
.floating-tools {
  position: fixed;
  bottom: 28px;
  right: 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  z-index: 90;
}

.scratchpad-toggle-btn,
.floating-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--jade);
  color: #fff;
  border: 1.5px solid var(--jade-dark);
  box-shadow: var(--shadow-float);
  font: 700 16px/40px var(--serif);
  text-align: center;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--duration-fast) var(--ease-out), background var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
}

.scratchpad-toggle-btn:hover,
.floating-btn:hover {
  transform: scale(1.1) translateY(-2px);
  background: var(--jade-hover);
  box-shadow: 0 8px 24px rgba(22, 85, 66, 0.35);
}

.undo-float {
  margin: 0;
}

.undo-float button {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #fff;
  color: var(--ink);
  border: 1.5px solid var(--line-strong);
  box-shadow: var(--shadow-float);
  font: 600 12px/40px var(--sans);
  text-align: center;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--duration-fast) var(--ease-out), border-color var(--duration-fast) ease, color var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
}

.undo-float button:hover {
  transform: scale(1.1) translateY(-2px);
  border-color: var(--orange);
  color: var(--orange);
  box-shadow: 0 8px 24px rgba(201, 83, 33, 0.25);
}

.floating-scratchpad {
  position: fixed;
  right: 28px;
  bottom: 84px;
  width: 340px;
  background: #fff;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow-float);
  display: none;
  flex-direction: column;
  z-index: 50;
  overflow: hidden;
  animation: scratchpad-slide 0.22s var(--ease-out);
}

.floating-scratchpad.is-active {
  display: flex;
}

@keyframes scratchpad-slide {
  from { opacity: 0; transform: translateY(12px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.scratchpad-header {
  padding: 10px 14px;
  background: var(--paper-surface);
  border-bottom: 1px solid var(--line-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font: 600 13px var(--serif);
}

.scratchpad-actions {
  display: flex;
  gap: 8px;
}

.scratchpad-textarea {
  width: 100%;
  height: 220px;
  padding: 12px 14px;
  border: none;
  outline: none;
  font-family: var(--serif);
  font-size: 14px;
  line-height: 1.7;
  background: var(--paper-warm);
  resize: none;
}

/* 全局搜索命令面板 (Command Palette Modal) */
.quick-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(18, 30, 24, 0.45);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: none;
  place-items: center;
  z-index: 100;
  padding: 20px;
}

.quick-modal-backdrop.is-open {
  display: grid;
}

.quick-modal-panel {
  width: min(580px, 100%);
  background: #fff;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-float);
  overflow: hidden;
  animation: modal-pop 0.2s var(--ease-out);
}

@keyframes modal-pop {
  from { opacity: 0; transform: scale(0.96) translateY(-8px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.quick-modal-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 10px;
}

.quick-search-input {
  width: 100%;
  border: none !important;
  box-shadow: none !important;
  font-size: 16px;
  background: transparent;
  padding: 0;
}

.quick-search-input:focus {
  outline: none;
}

.quick-results-list {
  max-height: 360px;
  overflow-y: auto;
  padding: 8px;
  display: grid;
  gap: 4px;
  scrollbar-width: thin;
}

.quick-result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--ink);
  transition: all var(--duration-fast) var(--ease-out);
}

.quick-result-item:hover,
.quick-result-item.is-selected {
  background: var(--jade-soft);
  color: var(--jade-dark);
}

.quick-result-category {
  font-size: 11.5px;
  color: var(--muted);
}

/* 复制微浮标 */
.copy-tooltip {
  position: absolute;
  padding: 4px 10px;
  border-radius: 4px;
  background: var(--jade-dark);
  color: #fff;
  font-size: 11.5px;
  font-weight: 550;
  pointer-events: none;
  z-index: 100;
  box-shadow: var(--shadow);
  animation: copy-fade 1.2s var(--ease-out) forwards;
}

@keyframes copy-fade {
  0% { opacity: 0; transform: translateY(4px); }
  20% { opacity: 1; transform: translateY(0); }
  80% { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(-4px); }
}

/* ==========================================================================
   响应式适配 (Responsive Media Queries)
   ========================================================================== */
.mobile-nav {
  display: none;
}

@media (max-width: 900px) {
  .site-header {
    padding: 0 18px;
    grid-template-columns: auto 1fr auto;
  }
  .primary-nav {
    display: none;
  }
  .page-shell {
    width: calc(100% - 28px);
    padding: 20px 0 84px;
  }
  .content-sidebar,
  .two-column {
    grid-template-columns: 1fr;
  }
  .mobile-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: rgba(244, 241, 234, 0.94);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid var(--line);
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    align-items: center;
    text-align: center;
    z-index: 40;
  }
  .mobile-nav a {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    font-size: 11.5px;
    color: var(--muted);
    font-weight: 500;
  }
  .mobile-nav a.active {
    color: var(--jade);
    font-weight: 650;
  }
  .floating-tools {
    bottom: 74px;
    right: 18px;
  }
  .floating-scratchpad {
    right: 18px;
    bottom: 130px;
    width: calc(100vw - 36px);
    max-width: 360px;
  }
}

/* ==========================================================================
   专业打印输出排版 (High-Precision Functional Print CSS)
   ========================================================================== */
@page {
  margin: 12mm 15mm;
  size: A4;
}

@media print {
  .site-header,
  .floating-tools,
  .floating-scratchpad,
  .quick-modal-backdrop,
  .page-actions,
  .mobile-nav,
  .flash-stack,
  .quick-preset-box,
  .quick-search-trigger,
  .task-create-panel,
  .meeting-create-panel,
  .notice-create-panel,
  .material-create-panel,
  .discipline-create-panel,
  .comm-create-panel,
  .course-actions-bar,
  .timetable-drag-hint,
  .group-filter-strip,
  input[type="search"] {
    display: none !important;
  }

  body {
    background: #fff !important;
    color: #000 !important;
    font-size: 12pt;
    line-height: 1.5;
  }

  .page-shell {
    width: 100% !important;
    max-width: 100% !important;
    padding: 0 !important;
    margin: 0 !important;
  }

  .panel, .task-card, .meeting-card, .notice-card, .material-archive-card, .discipline-card, .comm-card {
    border: 1px solid #999 !important;
    box-shadow: none !important;
    background: #fff !important;
    break-inside: avoid;
    page-break-inside: avoid;
    margin-bottom: 10pt;
  }

  .content-sidebar {
    grid-template-columns: 1fr !important;
  }

  .data-table {
    border: 1px solid #000 !important;
  }

  .data-table th,
  .data-table td {
    border: 1px solid #666 !important;
    color: #000 !important;
    padding: 6pt 8pt !important;
  }

  .data-table thead th {
    background: #eee !important;
  }

  .seat-card {
    border: 1px solid #444 !important;
    background: #fff !important;
  }

  .course-card {
    border: 1px solid #444 !important;
    background: #fff !important;
  }

  .course-card.is-my-course {
    border: 2px solid #000 !important;
  }
}