/* 百晓（测评平台 Web 版）- 全局样式（Linear/Vercel 现代简约科技风）
   改造说明：设计令牌 --seed-* 体系；旧变量（--accent 等）保留为别名指向新令牌，保证兼容 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  /* 表面与背景 */
  --seed-bg: #f5f6f8;              /* 页面底色 */
  --seed-surface: #ffffff;          /* 侧边栏、卡片等表面 */
  --seed-elevated: #ffffff;         /* 浮层、弹窗 */
  --seed-hover: #f0f1f3;            /* 行悬浮、按钮悬浮 */

  /* 文字层级 */
  --seed-fg: #1a1d23;              /* 主文字 */
  --seed-fg-secondary: #4a5060;    /* 次要文字 */
  --seed-fg-muted: #6b7280;        /* 辅助文字（导航项、标签） */
  --seed-fg-subtle: #9ca3af;       /* 最弱文字（占位符、分割标签） */

  /* 品牌色 */
  --seed-primary: #5e6ad2;         /* 主按钮、活跃态 */
  --seed-accent: #5e6ad2;          /* 强调色（导航高亮、链接） */
  --seed-accent-hover: #4f5bc3;    /* 强调色悬浮 */

  /* 边框 */
  --seed-border: rgba(0,0,0,0.1);
  --seed-border-subtle: rgba(0,0,0,0.06);

  /* 语义色 */
  --seed-success: #16a34a;
  --seed-warning: #d97706;
  --seed-danger: #dc2626;

  /* 语义背景（用于徽章、标签、状态指示） */
  --seed-success-bg: rgba(22,163,74,0.1);
  --seed-warning-bg: rgba(217,119,6,0.1);
  --seed-danger-bg: rgba(220,38,38,0.1);
  --seed-accent-bg: rgba(94,106,210,0.08);

  /* 五级评价色（卓越/优秀/中等/偏弱/显著偏弱） */
  --seed-l5-bg: rgba(22,163,74,0.1);   --seed-l5-fg: #16a34a;
  --seed-l4-bg: rgba(94,106,210,0.1);  /* 优秀 - 蓝紫 */
  --seed-l3-bg: rgba(217,119,6,0.1);   --seed-l3-fg: #d97706;
  --seed-l2-bg: rgba(234,88,12,0.1);   --seed-l2-fg: #ea580c;
  --seed-l1-bg: rgba(220,38,38,0.1);   --seed-l1-fg: #dc2626;

  /* 等级码语义色（Lv.1–Lv.5）：徽章/五格档位条单一来源，随主题 */
  --lv5: var(--seed-l5-fg); --lv4: var(--seed-accent); --lv3: var(--seed-l3-fg);
  --lv2: var(--seed-l2-fg); --lv1: var(--seed-l1-fg);

  /* 其他 */
  --seed-white: #ffffff;
  --seed-shadow: rgba(0,0,0,0.06);
  --seed-radius: 8px;
  --seed-content-padding: 24px;
  --seed-font-size: 14px;
}

/* ===== 深色主题 ===== */
[data-theme="dark"] {
  --seed-bg: #08090a;
  --seed-surface: #0f1011;
  --seed-elevated: #191a1b;
  --seed-hover: #28282c;
  --seed-fg: #f7f8f8;
  --seed-fg-secondary: #d0d6e0;
  --seed-fg-muted: #8a8f98;
  --seed-fg-subtle: #62666d;
  --seed-primary: #5e6ad2;
  --seed-accent: #7170ff;
  --seed-accent-hover: #828fff;
  --seed-border: rgba(255,255,255,0.08);
  --seed-border-subtle: rgba(255,255,255,0.05);
  --seed-success: #27a644;
  --seed-warning: #f59e0b;
  --seed-danger: #ef4444;
  --seed-white: #ffffff;
  --seed-shadow: rgba(0,0,0,0.12);
  --seed-accent-bg: rgba(94,106,210,0.12);
  --seed-success-bg: rgba(39,166,68,0.12);
  --seed-warning-bg: rgba(245,158,11,0.12);
  --seed-danger-bg: rgba(239,68,68,0.12);
  --seed-l5-bg: rgba(39,166,68,0.15);  --seed-l5-fg: #34d058;
  --seed-l4-bg: rgba(94,106,210,0.15);
  --seed-l3-bg: rgba(245,158,11,0.15); --seed-l3-fg: #f5b940;
  --seed-l2-bg: rgba(239,108,68,0.15); --seed-l2-fg: #ef6c44;
  --seed-l1-bg: rgba(239,68,68,0.15);  --seed-l1-fg: #f87171;
}

/* ===== 旧变量别名（向后兼容，禁止在新代码中使用） ===== */
:root {
  --accent: var(--seed-accent);
  --accent-hover: var(--seed-accent-hover);
  --bg: var(--seed-bg);
  --card-bg: var(--seed-surface);
  --card-border: var(--seed-border);
  --text-primary: var(--seed-fg);
  --text-secondary: var(--seed-fg-muted);
  --text-body: var(--seed-fg-secondary);
  --success: var(--seed-success);
  --warning: var(--seed-warning);
  --danger: var(--seed-danger);
  --shadow: 0 1px 2px var(--seed-shadow);
}

/* ===== 全局基础 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
  height: 100%;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-feature-settings: 'cv01', 'ss03';
  background: var(--seed-bg);
  color: var(--seed-fg);
  font-size: var(--seed-font-size);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ===== 全局布局骨架（App Shell） ===== */
.app-layout {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto 1fr;
  grid-template-areas: "sidebar topbar" "sidebar main";
  height: 100vh;
  overflow: hidden;
}
.app-main {
  grid-area: main;
  overflow-y: auto;
  padding: var(--seed-content-padding);
}

/* 侧边栏 */
.sidebar {
  grid-area: sidebar;
  width: 240px;
  background: var(--seed-surface);
  border-right: 1px solid var(--seed-border);
  display: flex;
  flex-direction: column;
  transition: width 0.2s ease;
  overflow: hidden;
  padding-bottom: 24px; /* 底部预留固定备案条空间，避免侧栏末端内容被遮挡 */
}
.sidebar.collapsed { width: 60px; }
.sidebar.collapsed .sidebar-brand span,
.sidebar.collapsed .nav-label,
.sidebar.collapsed .nav-section-label,
.sidebar.collapsed .sidebar-footer-info { display: none; }
.sidebar.collapsed .nav-item { justify-content: center; padding: 8px 0; }
.sidebar.collapsed .nav-item svg { margin-right: 0; }

.sidebar-brand {
  display: flex; align-items: center; gap: 10px;
  padding: 20px 16px 16px;
  border-bottom: 1px solid var(--seed-border-subtle);
}
.sidebar-brand svg { flex-shrink: 0; color: var(--seed-accent); }
.sidebar-brand span {
  font-size: 15px; font-weight: 500; color: var(--seed-fg);
  letter-spacing: -0.01em; white-space: nowrap;
}
.sidebar-nav { flex: 1; padding: 8px; overflow-y: auto; }
.nav-section-label {
  font-size: 11px; font-weight: 500; color: var(--seed-fg-subtle);
  text-transform: uppercase; letter-spacing: 0.08em;
  padding: 12px 10px 6px;
}
.nav-item {
  display: flex; align-items: center; gap: 8px;
  height: 34px; padding: 8px 10px;
  border-radius: 6px;
  font-size: 13px; font-weight: 500;
  color: var(--seed-fg-muted);
  cursor: pointer; user-select: none;
  transition: all 0.15s ease;
  white-space: nowrap;
}
.nav-item:hover { background: var(--seed-hover); color: var(--seed-fg-secondary); }
.nav-item.active { background: var(--seed-accent-bg); color: var(--seed-accent); }
.nav-item svg { width: 16px; height: 16px; flex-shrink: 0; margin-right: 0; }
.sidebar-footer {
  border-top: 1px solid var(--seed-border-subtle);
  padding: 12px;
  display: flex; align-items: center; gap: 10px;
}
.sidebar-footer-info { min-width: 0; }
.sidebar-footer-info .sf-name { font-size: 13px; font-weight: 500; color: var(--seed-fg); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sidebar-footer-info .sf-role { font-size: 11px; color: var(--seed-fg-subtle); }

/* 顶栏 */
.topbar {
  grid-area: topbar;
  height: 52px;
  background: var(--seed-surface);
  border-bottom: 1px solid var(--seed-border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 16px;
  gap: 12px;
}
.topbar-left, .topbar-right { display: flex; align-items: center; gap: 10px; }
.breadcrumb { font-size: 13px; color: var(--seed-fg-muted); }
.breadcrumb b { font-weight: 500; color: var(--seed-fg); }
.breadcrumb .sep { margin: 0 6px; color: var(--seed-fg-subtle); }
.search-box {
  display: flex; align-items: center; gap: 6px;
  height: 34px; padding: 0 10px;
  border: 1px solid var(--seed-border); border-radius: 6px;
  background: var(--seed-bg);
  min-width: 200px;
}
.search-box input {
  border: none; outline: none; background: transparent;
  font-size: 13px; color: var(--seed-fg); width: 100%; font-family: inherit;
}
.search-box input::placeholder { color: var(--seed-fg-subtle); }
.search-box .kbd {
  font-size: 11px; color: var(--seed-fg-subtle);
  border: 1px solid var(--seed-border); border-radius: 4px;
  padding: 0 5px; line-height: 16px;
}
.notify-btn { position: relative; }
.notify-btn .dot {
  position: absolute; top: 6px; right: 6px;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--seed-danger);
}
.avatar {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--seed-accent-bg); color: var(--seed-accent);
  font-size: 13px; font-weight: 600;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

/* ===== 页面容器 ===== */
.page {
  display: none; max-width: 1200px; margin: 0 auto;
  padding: 0; animation: fadeIn 0.3s ease;
}
.page.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ===== 卡片 ===== */
.card {
  background: var(--seed-elevated); border-radius: var(--seed-radius);
  border: 1px solid var(--seed-border);
  padding: 20px; margin-bottom: 16px;
  transition: box-shadow 0.2s ease;
}
.card:hover { box-shadow: 0 4px 16px var(--seed-shadow); }
.card-title {
  font-size: 13px; font-weight: 500; color: var(--seed-fg-muted);
  margin-bottom: 12px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 7px 14px; border-radius: 6px; border: none;
  font-size: 13px; font-weight: 500; cursor: pointer; font-family: inherit;
  transition: all 0.15s ease; text-decoration: none;
}
.btn-primary { background: var(--seed-primary); color: var(--seed-white); }
.btn-primary:hover { background: var(--seed-accent-hover); }
.btn-primary:disabled { background: var(--seed-border); color: var(--seed-fg-subtle); cursor: not-allowed; }
.btn-secondary {
  background: transparent; color: var(--seed-fg-secondary);
  border: 1px solid var(--seed-border);
}
.btn-secondary:hover { background: var(--seed-hover); border-color: var(--seed-border); color: var(--seed-fg-secondary); }
.btn-danger { background: var(--seed-danger); color: var(--seed-white); }
.btn-danger:hover { filter: brightness(0.92); }
.btn-success { background: var(--seed-success); color: var(--seed-white); }
.btn-success:hover { filter: brightness(0.92); }
.btn-warning { background: var(--seed-warning); color: var(--seed-white); }
.btn-warning:hover { filter: brightness(0.92); }

/* 图标按钮 */
.icon-btn {
  width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 6px;
  border: 1px solid var(--seed-border);
  background: transparent; cursor: pointer;
  color: var(--seed-fg-muted);
  transition: all 0.15s ease;
}
.icon-btn:hover { background: var(--seed-hover); color: var(--seed-fg-secondary); }
.icon-btn svg { width: 16px; height: 16px; }

/* ===== 表单 ===== */
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block; font-size: 13px; font-weight: 500;
  color: var(--seed-fg-secondary); margin-bottom: 6px;
}
.form-input {
  width: 100%; padding: 7px 12px; border-radius: 6px;
  border: 1px solid var(--seed-border); font-size: 13px;
  background: var(--seed-bg); color: var(--seed-fg);
  outline: none; transition: border-color 0.15s; font-family: inherit;
}
.form-input:focus { border-color: var(--seed-accent); }
.form-input::placeholder { color: var(--seed-fg-subtle); }

/* ===== 数据表格 ===== */
.data-table {
  width: 100%;
  border-collapse: separate; border-spacing: 0;
  background: var(--seed-elevated);
  border: 1px solid var(--seed-border);
  border-radius: var(--seed-radius);
  overflow: hidden;
}
.data-table th {
  font-size: 12px; font-weight: 500; color: var(--seed-fg-muted);
  text-align: left; padding: 10px 16px;
  border-bottom: 1px solid var(--seed-border);
}
.data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--seed-border-subtle);
  font-size: 13px; color: var(--seed-fg);
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--seed-hover); }

/* ===== 徽章 ===== */
.badge {
  display: inline-block; padding: 2px 8px; border-radius: 4px;
  font-size: 12px; font-weight: 500;
}
.badge-success { background: var(--seed-success-bg); color: var(--seed-success); }
.badge-warning { background: var(--seed-warning-bg); color: var(--seed-warning); }
.badge-danger { background: var(--seed-danger-bg); color: var(--seed-danger); }
.badge-info { background: var(--seed-accent-bg); color: var(--seed-accent); }

/* 五级评价徽章 */
.badge-l5 { background: var(--seed-l5-bg); color: var(--seed-l5-fg); }
.badge-l4 { background: var(--seed-l4-bg); color: var(--seed-accent); }
.badge-l3 { background: var(--seed-l3-bg); color: var(--seed-l3-fg); }
.badge-l2 { background: var(--seed-l2-bg); color: var(--seed-l2-fg); }
.badge-l1 { background: var(--seed-l1-bg); color: var(--seed-l1-fg); }
.badge-lg { font-size: 19px; padding: 5px 16px; border-radius: 8px; font-weight: 700; letter-spacing: .3px; }

/* 五格档位条：等级=第几档（左 Lv.1 → 右 Lv.5），当前档填色、其余灰 */
.level-steps { display: inline-flex; gap: 3px; align-items: center; vertical-align: middle; }
.level-steps i { display: block; width: 16px; height: 6px; border-radius: 3px; background: var(--seed-hover); }
.level-steps.mini i { width: 10px; height: 5px; border-radius: 2.5px; }

/* ===== 标签 ===== */
.tag {
  display: inline-block; padding: 2px 8px; border-radius: 4px;
  font-size: 12px; font-weight: 500;
}
.tag-blue { background: var(--seed-accent-bg); color: var(--seed-accent); }
.tag-green { background: var(--seed-success-bg); color: var(--seed-success); }
.tag-orange { background: var(--seed-warning-bg); color: var(--seed-warning); }
.tag-gray { background: var(--seed-hover); color: var(--seed-fg-muted); }

/* ===== 进度条 ===== */
.progress-bar {
  width: 100%; height: 6px; background: var(--seed-border);
  border-radius: 3px; overflow: hidden;
}
.progress-fill {
  height: 100%; background: var(--seed-accent);
  border-radius: 3px; transition: width 0.4s ease;
}

/* ===== 步骤指示器 ===== */
.step-indicator {
  display: flex; align-items: center; justify-content: center;
  gap: 8px; margin-bottom: 24px;
}
.step {
  width: 32px; height: 32px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 500;
  background: transparent; border: 2px solid var(--seed-border); color: var(--seed-fg-muted);
}
.step.active { background: var(--seed-accent-bg); border-color: var(--seed-accent); color: var(--seed-accent); }
.step.done { background: var(--seed-success); border-color: var(--seed-success); color: var(--seed-white); }
.step-line { width: 40px; height: 2px; background: var(--seed-border); }
.step-line.done { background: var(--seed-success); }

/* 新版步骤圆点（4.7 规范） */
.step-circle {
  width: 32px; height: 32px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 500;
  border: 2px solid var(--seed-border);
  color: var(--seed-fg-muted);
  background: transparent;
  flex-shrink: 0;
}
.step-circle.active { border-color: var(--seed-accent); color: var(--seed-accent); background: var(--seed-accent-bg); }
.step-circle.done { border-color: var(--seed-success); color: var(--seed-white); background: var(--seed-success); }
.step-line-v2 { width: 60px; height: 2px; background: var(--seed-border); }
.step-line-v2.done { background: var(--seed-success); }

/* ===== KPI 统计卡片 ===== */
.stat-card {
  background: var(--seed-elevated);
  border: 1px solid var(--seed-border);
  border-radius: var(--seed-radius);
  padding: 20px;
}
.stat-value {
  font-size: 28px; font-weight: 600; color: var(--seed-fg);
  letter-spacing: -0.02em; font-variant-numeric: tabular-nums;
}
.stat-label { font-size: 12px; color: var(--seed-fg-muted); margin-top: 4px; }
.stat-trend { font-size: 12px; font-weight: 500; color: var(--seed-success); }
.stat-trend.negative { color: var(--seed-danger); }

/* ===== 网格 ===== */
.grid { display: grid; gap: 12px; }

/* ===== 学生端特有 ===== */
.student-body {
  background: var(--seed-bg); display: flex; align-items: center;
  justify-content: center; min-height: 100vh;
}
.student-page {
  display: none; width: 100%; max-width: 800px;
  padding: 40px; text-align: center;
}
.student-page.active { display: block; }
.student-page h1 { font-size: 36px; margin-bottom: 20px; }
.student-page p { font-size: 20px; color: var(--seed-fg-muted); margin-bottom: 32px; line-height: 1.6; }
.student-page .btn { padding: 16px 48px; font-size: 20px; border-radius: 12px; }

/* ===== 底部操作区 ===== */
.actions { display: flex; gap: 12px; justify-content: center; margin-top: 20px; }

/* ===== 浮动提示 ===== */
.toast {
  position: fixed; top: 20px; left: 50%; transform: translateX(-50%);
  padding: 12px 24px; border-radius: 8px; font-size: 14px;
  font-weight: 500; z-index: 999; display: none;
  animation: slideDown 0.3s ease;
}
.toast.show { display: block; }
.toast-error { background: var(--seed-danger); color: var(--seed-white); }
.toast-success { background: var(--seed-success); color: var(--seed-white); }
.toast-info { background: var(--seed-accent); color: var(--seed-white); }
@keyframes slideDown { from { opacity: 0; transform: translateX(-50%) translateY(-10px); } to { opacity: 1; transform: translateX(-50%) translateY(0); } }

/* ===== 模态框 ===== */
.modal-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,0.5); z-index: 1000;
  align-items: center; justify-content: center;
}
.modal-overlay.active { display: flex; }
.modal-content {
  background: var(--seed-elevated);
  border: 1px solid var(--seed-border);
  border-radius: var(--seed-radius);
  width: 90%; max-width: 800px; max-height: 85vh;
  overflow-y: auto; padding: 24px;
  box-shadow: 0 20px 60px var(--seed-shadow);
}
.modal-close {
  float: right; font-size: 22px; cursor: pointer;
  color: var(--seed-fg-muted); padding: 4px; line-height: 1;
}
.modal-close:hover { color: var(--seed-fg); }
.modal-title { font-size: 17px; font-weight: 600; margin-bottom: 16px; color: var(--seed-fg); }

/* ===== 主题切换按钮（.icon-moon / .icon-sun 显隐） ===== */
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* ===== 登录页（全屏居中 + 光晕） ===== */
.login-screen {
  position: fixed; inset: 0; z-index: 3000;
  display: none; align-items: center; justify-content: center;
  background: var(--seed-bg);
  overflow: hidden;
}
.login-screen.show { display: flex; }
.login-screen::before {
  content: ''; position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -55%);
  width: 600px; height: 500px;
  background: radial-gradient(ellipse at center, rgba(94,106,210,0.08) 0%, rgba(94,106,210,0.03) 40%, transparent 70%);
  pointer-events: none;
}
.login-container { width: 100%; max-width: 400px; padding: 0 20px; position: relative; z-index: 1; }
.login-brand { text-align: center; margin-bottom: 28px; }
.login-brand-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; border-radius: 12px;
  background: var(--seed-accent-bg); margin-bottom: 14px;
}
.login-brand-icon svg { width: 26px; height: 26px; color: var(--seed-accent); }
.brand-title { font-size: 20px; font-weight: 500; letter-spacing: -0.02em; color: var(--seed-fg); margin-bottom: 4px; }
.brand-subtitle { font-size: 13px; color: var(--seed-fg-muted); }
.login-card {
  background: var(--seed-elevated);
  border: 1px solid var(--seed-border);
  border-radius: var(--seed-radius);
  padding: 28px;
  transition: box-shadow 0.2s ease;
}
.login-card:hover { box-shadow: 0 4px 16px var(--seed-shadow); }
.login-tabs {
  display: flex; gap: 2px; margin-bottom: 22px;
  background: var(--seed-bg); border-radius: 6px; padding: 3px;
}
.login-tab {
  flex: 1; padding: 8px 14px; font-size: 13px; font-weight: 500;
  color: var(--seed-fg-muted); border-radius: 4px; cursor: pointer;
  transition: all 0.15s ease; border: none; background: transparent;
  font-family: inherit; text-align: center;
}
.login-tab:hover { color: var(--seed-fg-secondary); }
.login-tab.active { color: var(--seed-fg); background: var(--seed-elevated); box-shadow: 0 1px 3px var(--seed-shadow); }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn 0.2s ease; }
.role-section { margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--seed-border-subtle); }
.role-label {
  font-size: 12px; font-weight: 500; color: var(--seed-fg-subtle);
  text-transform: uppercase; letter-spacing: 0.06em;
  margin-bottom: 10px; text-align: center;
}
.role-pills { display: flex; gap: 8px; justify-content: center; }
.role-pill {
  padding: 6px 16px; border-radius: 9999px;
  border: 1px solid var(--seed-border); background: transparent;
  font-family: inherit; font-size: 13px; font-weight: 500;
  color: var(--seed-fg-muted); cursor: pointer; transition: all 0.15s ease;
}
.role-pill:hover { border-color: var(--seed-accent); color: var(--seed-fg-secondary); background: var(--seed-accent-bg); }
.role-pill.active { border-color: var(--seed-accent); color: var(--seed-accent); background: var(--seed-accent-bg); }
.login-error-text { color: var(--seed-danger); font-size: 13px; min-height: 18px; margin-bottom: 6px; }
.login-footer { text-align: center; margin-top: 28px; font-size: 12px; color: var(--seed-fg-subtle); }
.login-footer-links { display: flex; align-items: center; justify-content: center; gap: 12px; margin-top: 8px; }
.login-footer-links a { font-size: 12px; color: var(--seed-fg-subtle); text-decoration: none; }
.login-footer-links a:hover { color: var(--seed-fg-muted); }
.login-screen .theme-toggle { position: absolute; top: 20px; right: 20px; }

/* ===== 图表（内联 SVG） ===== */
.chart-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}
.chart-container { position: relative; }
.chart-container svg { width: 100%; display: block; }
.chart-legend { display: flex; gap: 16px; margin-top: 8px; }
.chart-legend .legend-item { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--seed-fg-muted); }
.chart-legend .legend-dot { width: 8px; height: 8px; border-radius: 50%; }

/* ===== 页面头部 ===== */
.page-header { margin-bottom: 16px; }
.page-header .page-title-v2 { font-size: 20px; font-weight: 600; letter-spacing: -0.01em; color: var(--seed-fg); }
.page-header .page-subtitle { font-size: 13px; color: var(--seed-fg-muted); margin-top: 2px; }

/* ===== 备案信息（页脚） ===== */
.beian-bar { position: fixed; bottom: 0; left: 0; right: 0; z-index: 9; text-align: center; font-size: 11px; line-height: 1.7; color: var(--seed-fg-subtle); background: var(--seed-bg); padding: 2px 0; pointer-events: none; }
.beian-bar a { color: var(--seed-fg-subtle); text-decoration: none; pointer-events: auto; }
.beian-bar a:hover { color: var(--seed-fg-muted); text-decoration: underline; }
.student-page .beian-line { text-align: center; font-size: 12px; color: var(--seed-fg-subtle); margin-top: 14px; }
.beian-line a { color: var(--seed-fg-subtle); text-decoration: none; }
.beian-line a:hover { color: var(--seed-fg-muted); text-decoration: underline; }

/* ===== 工作台切换（测评 / 学员管理）===== */
.ws-switch {
  display: flex; gap: 4px; margin: 0 8px 4px; padding: 3px;
  background: var(--seed-hover); border-radius: 8px;
}
.ws-tab {
  flex: 1; padding: 6px 4px; border: none; border-radius: 6px;
  background: transparent; color: var(--seed-fg-muted);
  font-family: inherit; font-size: 12px; font-weight: 500;
  cursor: pointer; transition: all 0.15s ease; white-space: nowrap;
}
.ws-tab:hover { color: var(--seed-fg); }
.ws-tab.active { background: var(--seed-elevated); color: var(--seed-fg); box-shadow: 0 1px 3px var(--seed-shadow); }

/* ===== 学员管理 ===== */
.mg-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.mg-title { font-size: 20px; font-weight: 600; letter-spacing: -0.01em; color: var(--seed-fg); }
.mg-sub { font-size: 13px; color: var(--seed-fg-muted); margin-top: 2px; }
.mg-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.mg-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 10px; }
.mg-card { border: 1px solid var(--seed-border); border-radius: 10px; padding: 12px 14px; background: var(--seed-bg); transition: border-color 0.15s ease; }
.mg-card:hover { border-color: var(--accent); }
.mg-card.mg-click { cursor: pointer; }
.mg-card.sel { border-color: var(--accent); background: var(--seed-hover); }

/* ===== AI 功能标识：有 LLM 参与的按钮，右上角挂一个小圆标（圈内 AI）===== */
.ai-host { position: relative; }
.ai-badge {
  position: absolute; top: -6px; right: -6px;
  width: 18px; height: 18px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #6d5ce8, #9b5cf6);
  color: #fff; font-size: 9px; font-weight: 800; line-height: 1;
  letter-spacing: 0.2px; font-family: inherit;
  border: 2px solid var(--seed-elevated);
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.28);
  pointer-events: none; z-index: 3; box-sizing: border-box;
}

.mg-card-top { display: flex; align-items: center; gap: 6px; }
.mg-card-name { font-size: 15px; font-weight: 600; color: var(--seed-fg); }
.mg-tag { font-size: 11px; padding: 1px 8px; border-radius: 9999px; background: rgba(243,156,18,0.15); color: var(--warning); border: 1px solid rgba(243,156,18,0.35); }
.mg-card-sub { font-size: 12px; color: var(--seed-fg-muted); margin-top: 4px; }
.mg-card-ops { display: flex; gap: 8px; margin-top: 10px; }
.mg-btn-sm { padding: 4px 10px; font-size: 12px; border-radius: 6px; border: 1px solid var(--seed-border); background: transparent; color: var(--seed-fg-secondary); cursor: pointer; font-family: inherit; transition: all 0.15s ease; }
.mg-btn-sm:hover { border-color: var(--accent); color: var(--accent); }
.mg-btn-primary { background: var(--seed-primary); border-color: var(--seed-primary); color: var(--seed-white); }
.mg-btn-primary:hover { background: var(--seed-accent-hover); border-color: var(--seed-accent-hover); color: var(--seed-white); }
.mg-empty { font-size: 13px; color: var(--seed-fg-subtle); padding: 10px 2px; }

/* ===== 课后反馈（点击式，对齐评分页交互语言）===== */
.lf-student { display: flex; align-items: baseline; gap: 10px; padding: 10px 14px; background: var(--seed-hover); border-radius: 8px; margin-bottom: 14px; }
.lf-student-name { font-size: 16px; font-weight: 700; color: var(--seed-fg); }
.lf-student-sub { font-size: 13px; color: var(--seed-fg-muted); }
.lf-group { margin-bottom: 14px; }
.lf-group-label { font-size: 13px; font-weight: 600; color: var(--seed-fg-secondary); margin-bottom: 8px; }
.lf-multi { font-size: 11px; font-weight: 400; color: var(--seed-fg-subtle); margin-left: 6px; }
.lf-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.lf-chip {
  padding: 7px 14px; border-radius: 9999px;
  border: 2px solid var(--seed-border); background: var(--seed-elevated);
  color: var(--seed-fg-secondary); font-family: inherit; font-size: 13px; font-weight: 500;
  cursor: pointer; transition: all 0.15s ease;
}
.lf-chip:hover { border-color: var(--accent); color: var(--accent); }
.lf-chip.selected { background: var(--accent); border-color: var(--accent); color: #fff; }

/* 表单字段（学员/班级弹窗与反馈页共用）*/
.lf-field { margin-bottom: 10px; }
.lf-input {
  width: 100%; box-sizing: border-box; padding: 8px 12px;
  border: 1px solid var(--seed-border); border-radius: 8px;
  font-size: 14px; font-family: inherit; outline: none;
  background: var(--seed-elevated); color: var(--seed-fg);
  transition: border-color 0.15s ease;
}
.lf-input:focus { border-color: var(--accent); }
.lf-members { display: flex; flex-wrap: wrap; gap: 8px; max-height: 180px; overflow-y: auto; padding: 2px; }

/* 管理页底部留白（避免 fixed 备案栏遮挡最后一行）*/
#page-learners, #page-lf, #page-course { padding-bottom: 32px; }

/* 家长消息（复制发送）*/
.lf-msg-box {
  font-size: 14px; line-height: 1.7; color: var(--seed-fg);
  background: var(--seed-hover); border-radius: 8px; padding: 14px;
  white-space: pre-wrap; word-break: break-word;
}

/* ===== 课程内容（知识点库）===== */
.cp-stats { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-size: 13px; color: var(--seed-fg-muted); margin-top: 12px; }
.cp-stat { font-size: 12px; padding: 2px 10px; border-radius: 9999px; background: var(--seed-hover); }
.cp-stat b { color: var(--seed-fg); font-weight: 600; }
.cp-unit { font-size: 12px; font-weight: 600; color: var(--seed-fg-subtle); margin: 14px 0 6px; letter-spacing: 0.02em; }
.cp-unit:first-child { margin-top: 2px; }
.cp-kp { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border: 1px solid var(--seed-border-subtle); border-radius: 8px; margin-bottom: 6px; background: var(--seed-bg); }
.cp-kp:hover { border-color: var(--seed-border); }
.cp-kp-name { font-size: 14px; color: var(--seed-fg); flex: 1; }
.cp-kp-meta { font-size: 12px; color: var(--seed-fg-subtle); white-space: nowrap; }
.cp-kp-ops { display: flex; gap: 6px; }
.cp-lv { font-size: 11px; padding: 1px 8px; border-radius: 9999px; border: 1px solid transparent; }
.cp-lv.great { color: #2f855a; background: rgba(47,133,90,0.12); border-color: rgba(47,133,90,0.3); }
.cp-lv.ok { color: var(--seed-fg-muted); background: var(--seed-hover); border-color: var(--seed-border-subtle); }
.cp-lv.needs { color: var(--warning); background: rgba(243,156,18,0.13); border-color: rgba(243,156,18,0.35); }
.cp-src { display: flex; justify-content: space-between; gap: 10px; padding: 7px 2px; border-top: 1px solid var(--seed-border-subtle); font-size: 13px; }
.cp-src:first-child { border-top: none; padding-top: 0; }
.cp-src-title { color: var(--seed-fg); }
.cp-src-meta { color: var(--seed-fg-subtle); font-size: 12px; white-space: nowrap; }
.cp-preview { max-height: 210px; overflow-y: auto; border: 1px solid var(--seed-border-subtle); border-radius: 8px; padding: 10px 12px; margin-top: 4px; }
.cp-preview-item { font-size: 13px; color: var(--seed-fg-secondary); padding: 2px 0; }
.cp-preview-item .u { color: var(--seed-fg-subtle); font-size: 12px; }
.cp-preview-item.existed { color: var(--seed-fg-subtle); text-decoration: line-through; }

/* 反馈页「本节知识点」 */
.lf-kp-row { display: flex; align-items: center; gap: 8px; padding: 7px 10px; border: 1px solid var(--seed-border-subtle); border-radius: 8px; margin-bottom: 6px; }
.lf-kp-name { font-size: 13px; color: var(--seed-fg); flex: 1; }
.lf-kp-unit { font-size: 11px; color: var(--seed-fg-subtle); margin-left: 4px; }
.lf-kp-lv { padding: 3px 10px; font-size: 12px; border-radius: 9999px; border: 1px solid var(--seed-border); background: var(--seed-elevated); color: var(--seed-fg-muted); cursor: pointer; font-family: inherit; transition: all 0.15s ease; }
.lf-kp-lv:hover { border-color: var(--accent); color: var(--accent); }
.lf-kp-lv.on.great { background: rgba(47,133,90,0.14); border-color: rgba(47,133,90,0.4); color: #2f855a; }
.lf-kp-lv.on.ok { background: var(--seed-hover); border-color: var(--seed-fg-subtle); color: var(--seed-fg); }
.lf-kp-lv.on.needs { background: rgba(243,156,18,0.14); border-color: rgba(243,156,18,0.4); color: var(--warning); }
.lf-kp-x { border: none; background: transparent; color: var(--seed-fg-subtle); cursor: pointer; font-size: 15px; padding: 0 4px; }
.lf-kp-x:hover { color: var(--danger, #e53e3e); }
.lf-kp-suggest { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.lf-kp-sug { font-size: 12px; padding: 3px 10px; border-radius: 9999px; border: 1px dashed var(--seed-border); background: transparent; color: var(--seed-fg-muted); cursor: pointer; font-family: inherit; }
.lf-kp-sug:hover { border-color: var(--accent); color: var(--accent); border-style: solid; }
.lf-hint { font-size: 12px; line-height: 1.6; color: var(--seed-fg-muted); background: rgba(243,156,18,0.08); border: 1px dashed rgba(243,156,18,0.4); border-radius: 8px; padding: 10px 12px; margin-bottom: 12px; white-space: pre-wrap; }

/* ===== 班级教材 / 周课表 / 课程计划（v18）===== */
.mc-sch-row { display: flex; align-items: center; gap: 6px; margin-top: 6px; flex-wrap: wrap; }
.mc-sch-del { border: none; background: transparent; color: var(--seed-fg-subtle); cursor: pointer; font-size: 14px; padding: 0 4px; line-height: 1; }
.mc-sch-del:hover { color: var(--danger, #e53e3e); }
.plan-sub { font-size: 12px; line-height: 1.6; color: var(--seed-fg-subtle); margin: -4px 0 10px; }
.plan-list { max-height: 52vh; overflow-y: auto; padding-right: 2px; }
.plan-row { border: 1px solid var(--seed-border-subtle); border-radius: 10px; padding: 10px 12px; margin-bottom: 8px; background: var(--seed-bg); }
.plan-row.next { border-color: rgba(109, 92, 232, 0.55); box-shadow: 0 0 0 2px rgba(109, 92, 232, 0.10); }
.plan-row-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.plan-seq { font-size: 13px; font-weight: 700; color: var(--seed-fg); white-space: nowrap; }
.plan-title { font-size: 13px; color: var(--seed-fg); flex: 1; min-width: 90px; }
.plan-badge { font-size: 11px; padding: 1px 8px; border-radius: 9999px; border: 1px solid transparent; white-space: nowrap; }
.plan-badge.planned { background: var(--seed-hover); color: var(--seed-fg-muted); border-color: var(--seed-border-subtle); }
.plan-badge.done { background: rgba(47, 133, 90, 0.12); color: #2f855a; border-color: rgba(47, 133, 90, 0.3); }
.plan-badge.next { background: rgba(109, 92, 232, 0.12); color: #6d5ce8; border-color: rgba(109, 92, 232, 0.35); }
.plan-date { font-size: 11px; color: var(--seed-fg-subtle); }
.plan-kps { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 7px; }
.plan-kp { font-size: 11px; color: var(--seed-fg-muted); background: var(--seed-hover); border-radius: 6px; padding: 1px 7px; }
.plan-ops { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.plan-ops .mg-btn-sm:disabled { opacity: 0.4; cursor: default; }
.lf-plan-banner { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 8px; font-size: 12px; line-height: 1.5; color: var(--seed-fg-muted); background: rgba(109, 92, 232, 0.06); border: 1px dashed rgba(109, 92, 232, 0.4); border-radius: 8px; padding: 8px 10px; }
.mg-today { display: flex; flex-wrap: wrap; gap: 8px; margin: 2px 0 12px; }

/* ===== 教学进度（课程内容页） ===== */
.cp-kp-detail { font-size: 12px; color: var(--seed-fg-subtle); margin-left: 8px;
  max-width: 260px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cp-unit { display: flex; align-items: center; justify-content: space-between; }
.cp-unit-prog { font-size: 12px; font-weight: 400; color: var(--seed-fg-subtle); }
.cp-taught { flex: 0 0 auto; width: 20px; height: 20px; border-radius: 50%;
  border: 1.5px solid var(--seed-border); display: inline-flex; align-items: center;
  justify-content: center; cursor: pointer; font-size: 12px; color: #fff;
  background: transparent; user-select: none; }
.cp-taught:hover { border-color: var(--accent, #4a7); }
.cp-taught.on { background: #3c9a6a; border-color: #3c9a6a; }
.cp-taught.pick { border-color: var(--accent, #4a7); background: rgba(74, 153, 119, .18); }
.cp-batch-bar { display: flex; align-items: center; gap: 10px; padding: 8px 12px;
  border: 1px solid var(--seed-border-subtle); border-radius: 8px; margin: 8px 0;
  font-size: 13px; background: var(--seed-bg); }
.btn.on { border-color: var(--accent, #4a7); color: var(--accent, #4a7); }
.cp-preview-unit { font-size: 12px; font-weight: 600; color: var(--seed-fg-subtle); margin: 8px 0 4px; }
.cp-preview-words { font-size: 11px; color: var(--seed-fg-subtle); }