/* ========================================
   人工智能学院智慧学工平台 — 设计系统
   ======================================== */

:root {
  /* 色彩系统 */
  --primary: #1677FF;
  --primary-hover: #4096FF;
  --primary-bg: #E6F4FF;
  --success: #52C41A;
  --success-bg: #F6FFED;
  --warning: #FAAD14;
  --warning-bg: #FFFBE6;
  --danger: #FF4D4F;
  --danger-bg: #FFF2F0;
  --bg-page: #F5F7FA;
  --bg-card: #FFFFFF;
  --text-primary: #1D2129;
  --text-secondary: #4E5969;
  --text-tertiary: #86909C;
  --border: #E5E6EB;
  --border-light: #F2F3F5;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.12);

  /* 字体 */
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  --fs-xs: 12px;
  --fs-sm: 13px;
  --fs-base: 14px;
  --fs-md: 16px;
  --fs-lg: 20px;
  --fs-xl: 24px;
  --fs-2xl: 32px;

  /* 间距 */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 20px;
  --space-2xl: 24px;
  --space-3xl: 32px;
  --space-4xl: 40px;

  /* 尺寸 */
  --sidebar-width: 220px;
  --sidebar-collapsed: 64px;
  --header-height: 60px;
  --radius: 8px;
  --radius-sm: 4px;
  --radius-lg: 12px;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: var(--font);
  font-size: var(--fs-base);
  color: var(--text-primary);
  background: var(--bg-page);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }

/* ========================================
   Layout — 侧栏+顶栏布局
   ======================================== */
.app-layout {
  display: flex;
  height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  background: #001529;
  color: rgba(255,255,255,0.85);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: width 0.3s;
  overflow: hidden;
}

.sidebar-logo {
  height: var(--header-height);
  display: flex;
  align-items: center;
  padding: 0 var(--space-lg);
  gap: var(--space-sm);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  flex-shrink: 0;
}
.sidebar-logo .logo-icon {
  width: 32px; height: 32px;
  background: var(--primary);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: var(--fs-md);
  flex-shrink: 0;
}
.sidebar-logo .logo-text {
  font-size: var(--fs-md);
  font-weight: 600;
  white-space: nowrap;
}

.sidebar-menu {
  flex: 1;
  padding: var(--space-sm) 0;
  overflow-y: auto;
}
.sidebar-menu .menu-section {
  padding: var(--space-sm) var(--space-lg) var(--space-xs);
  font-size: var(--fs-xs);
  color: rgba(255,255,255,0.4);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.sidebar-menu .menu-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: 10px var(--space-lg);
  cursor: pointer;
  color: rgba(255,255,255,0.65);
  font-size: var(--fs-base);
  transition: all 0.2s;
  border-left: 3px solid transparent;
}
.sidebar-menu .menu-item:hover {
  color: #fff;
  background: rgba(255,255,255,0.08);
}
.sidebar-menu .menu-item.active {
  color: #fff;
  background: var(--primary);
  border-left-color: #fff;
}
.sidebar-menu .menu-item .menu-icon {
  width: 20px;
  text-align: center;
  flex-shrink: 0;
  font-size: var(--fs-md);
}
.sidebar-menu .menu-item .menu-label {
  white-space: nowrap;
}
.sidebar-menu .sub-menu-item {
  padding-left: 55px;
}

/* Main area */
.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.topbar {
  height: var(--header-height);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 var(--space-2xl);
  gap: var(--space-lg);
  flex-shrink: 0;
}
.topbar .breadcrumb {
  font-size: var(--fs-sm);
  color: var(--text-tertiary);
}
.topbar .breadcrumb span { color: var(--text-primary); }
.topbar .spacer { flex: 1; }
.topbar .topbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}
.topbar .topbar-actions .icon-btn {
  width: 36px; height: 36px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--text-secondary);
  position: relative;
  border: none; background: transparent;
  font-size: 18px;
}
.topbar .topbar-actions .icon-btn:hover { background: var(--bg-page); }
.topbar .topbar-actions .badge-dot {
  position: absolute; top: 4px; right: 4px;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--danger);
}
.topbar .user-info {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
}
.topbar .user-avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--primary-bg);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: var(--fs-sm); font-weight: 600;
}
.topbar .user-name { font-size: var(--fs-sm); color: var(--text-primary); }

.page-content {
  flex: 1;
  padding: var(--space-2xl);
  overflow-y: auto;
}

/* ========================================
   Login Page
   ======================================== */
.login-page {
  display: flex;
  min-height: 100vh;
  background: linear-gradient(135deg, #001529 0%, #003a70 50%, #004d99 100%);
}
.login-banner {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: #fff;
  padding: var(--space-4xl);
}
.login-banner h1 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: var(--space-lg);
}
.login-banner p {
  font-size: var(--fs-md);
  color: rgba(255,255,255,0.7);
  max-width: 400px;
  text-align: center;
  line-height: 1.8;
}
.login-card {
  width: 440px;
  margin: auto;
  margin-right: 10%;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-4xl);
  box-shadow: var(--shadow-lg);
}
.login-card .login-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}
.login-card .login-header .logo-icon {
  width: 48px; height: 48px;
  background: var(--primary);
  border-radius: var(--radius);
  display: inline-flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: var(--fs-xl);
  margin-bottom: var(--space-lg);
}
.login-card .login-header h2 { font-size: var(--fs-xl); margin-bottom: var(--space-xs); }
.login-card .login-header p { color: var(--text-tertiary); font-size: var(--fs-sm); }
.form-group { margin-bottom: var(--space-xl); }
.form-group label {
  display: block;
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  font-weight: 500;
}
.form-group .form-input {
  width: 100%;
  height: 42px;
  padding: 0 var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: var(--fs-base);
  font-family: var(--font);
  outline: none;
  transition: border 0.2s;
}
.form-group .form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-bg);
}
.form-row { display: flex; gap: var(--space-md); }
.form-row .form-group { flex: 1; }
.form-actions { margin-top: var(--space-2xl); }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  height: 42px;
  padding: 0 var(--space-2xl);
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--fs-base);
  font-family: var(--font);
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  width: 100%;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}
.btn-outline:hover { background: var(--primary-bg); }
.btn-sm { height: 32px; padding: 0 var(--space-lg); font-size: var(--fs-sm); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #ff7875; }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #73d13d; }

/* ========================================
   Cards
   ======================================== */
.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-2xl);
  border-bottom: 1px solid var(--border-light);
}
.card-header h3 {
  font-size: var(--fs-md);
  font-weight: 600;
}
.card-body { padding: var(--space-2xl); }

.stat-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}
.stat-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: var(--space-xl) var(--space-2xl);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}
.stat-card .stat-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}
.stat-card .stat-info h4 {
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  font-weight: 400;
  margin-bottom: var(--space-xs);
}
.stat-card .stat-info .stat-value {
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--text-primary);
}
.stat-card .stat-info .stat-change {
  font-size: var(--fs-xs);
  margin-left: var(--space-sm);
  font-weight: 500;
}
.stat-change.up { color: var(--success); }
.stat-change.down { color: var(--danger); }

/* ========================================
   Tables
   ======================================== */
.table-container {
  overflow-x: auto;
}
table {
  width: 100%;
  border-collapse: collapse;
}
table th, table td {
  padding: 12px var(--space-lg);
  text-align: left;
  border-bottom: 1px solid var(--border-light);
  font-size: var(--fs-sm);
}
table th {
  background: var(--bg-page);
  color: var(--text-secondary);
  font-weight: 500;
  white-space: nowrap;
}
table tbody tr:hover {
  background: #F8FAFE;
}
table td .tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: var(--fs-xs);
  font-weight: 500;
}
.tag-success { background: var(--success-bg); color: var(--success); }
.tag-warning { background: var(--warning-bg); color: var(--warning); }
.tag-danger { background: var(--danger-bg); color: var(--danger); }
.tag-primary { background: var(--primary-bg); color: var(--primary); }
.table-actions {
  display: flex;
  gap: var(--space-sm);
}
.table-actions .action-link {
  font-size: var(--fs-sm);
  cursor: pointer;
  color: var(--primary);
}
.table-actions .action-link:hover { text-decoration: underline; }
.table-actions .action-link.danger { color: var(--danger); }

/* ========================================
   Filters / Search
   ======================================== */
.filter-bar {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
  align-items: center;
}
.filter-bar select, .filter-bar input {
  height: 36px;
  padding: 0 var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  font-family: var(--font);
  outline: none;
  background: var(--bg-card);
  min-width: 140px;
}
.filter-bar select:focus, .filter-bar input:focus {
  border-color: var(--primary);
}

/* ========================================
   Tabs
   ======================================== */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-2xl);
}
.tabs .tab {
  padding: 10px var(--space-xl);
  cursor: pointer;
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
.tabs .tab:hover { color: var(--primary); }
.tabs .tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 500;
}

/* ========================================
   Info Grid (学生详情)
   ======================================== */
.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}
.info-item {}
.info-item .info-label {
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  margin-bottom: var(--space-xs);
}
.info-item .info-value {
  font-size: var(--fs-base);
  color: var(--text-primary);
}

/* ========================================
   Charts (简易 SVG/CSS 图表)
   ======================================== */
.chart-box {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: var(--space-xl) var(--space-2xl);
}
.chart-box .chart-title {
  font-size: var(--fs-md);
  font-weight: 600;
  margin-bottom: var(--space-lg);
}

/* Bar chart */
.bar-chart { display: flex; align-items: flex-end; gap: var(--space-md); height: 200px; padding-top: var(--space-lg); }
.bar-item { flex: 1; display: flex; flex-direction: column; align-items: center; height: 100%; justify-content: flex-end; }
.bar-item .bar {
  width: 100%; max-width: 40px;
  background: var(--primary);
  border-radius: 4px 4px 0 0;
  transition: height 0.3s;
  min-height: 4px;
}
.bar-item .bar-label { font-size: var(--fs-xs); color: var(--text-tertiary); margin-top: var(--space-sm); white-space: nowrap; }

/* Radar chart (SVG based) */
.radar-container {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--space-xl);
}

/* Timeline / trend */
.trend-line {
  position: relative;
  height: 120px;
  display: flex;
  align-items: flex-end;
  gap: 2px;
  padding: var(--space-lg) 0;
}
.trend-bar {
  flex: 1;
  background: linear-gradient(to top, var(--primary), var(--primary-hover));
  border-radius: 2px 2px 0 0;
  min-width: 8px;
  transition: height 0.3s;
}

/* ========================================
   Alerts / Warnings
   ======================================== */
.alert-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.alert-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
}
.alert-item.alert-red { background: var(--danger-bg); color: var(--danger); }
.alert-item.alert-orange { background: var(--warning-bg); color: var(--warning); }
.alert-item.alert-yellow { background: #FFFBE6; color: #AD8B00; }
.alert-item .alert-time { color: var(--text-tertiary); flex-shrink: 0; }
.alert-item .alert-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.alert-item .alert-dot.red { background: var(--danger); }
.alert-item .alert-dot.orange { background: var(--warning); }
.alert-item .alert-dot.yellow { background: #AD8B00; }

/* ========================================
   Monitor Page (Big Screen)
   ======================================== */
.monitor-page {
  background: #000e1a;
  color: #fff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: var(--space-2xl);
}
.monitor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.monitor-header h1 {
  font-size: 28px;
  background: linear-gradient(90deg, #1677FF, #69B1FF);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.monitor-header .monitor-time { color: rgba(255,255,255,0.6); font-size: var(--fs-md); }
.monitor-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  margin: var(--space-2xl) 0;
}
.monitor-stat {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: var(--space-xl);
  text-align: center;
}
.monitor-stat .ms-value {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}
.monitor-stat .ms-label { color: rgba(255,255,255,0.5); font-size: var(--fs-sm); }
.monitor-stat .ms-value.green { color: var(--success); }
.monitor-stat .ms-value.blue { color: var(--primary); }
.monitor-stat .ms-value.red { color: var(--danger); }
.monitor-stat .ms-value.orange { color: var(--warning); }

.monitor-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-lg);
  flex: 1;
}
.monitor-panel {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
}
.monitor-panel .panel-title {
  font-size: var(--fs-md);
  color: rgba(255,255,255,0.7);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.monitor-panel .panel-title .highlight { color: var(--primary); }

/* Marquee */
.marquee-bar {
  margin-top: var(--space-lg);
  padding: var(--space-md) var(--space-xl);
  background: rgba(255,77,79,0.1);
  border: 1px solid rgba(255,77,79,0.3);
  border-radius: var(--radius-sm);
  color: var(--danger);
  font-size: var(--fs-sm);
  overflow: hidden;
  white-space: nowrap;
}
.marquee-bar span { display: inline-block; animation: marquee 20s linear infinite; }
@keyframes marquee {
  0% { transform: translateX(100%); }
  100% { transform: translateX(-100%); }
}

/* ========================================
   Portrait Page
   ======================================== */
.portrait-header {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}
.portrait-avatar {
  width: 72px; height: 72px;
  border-radius: 50%;
  background: var(--primary-bg);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 28px; font-weight: 700;
  flex-shrink: 0;
}
.portrait-meta h2 { font-size: var(--fs-xl); margin-bottom: var(--space-xs); }
.portrait-meta p { color: var(--text-tertiary); font-size: var(--fs-sm); }
.portrait-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}
.portrait-full { grid-column: 1 / -1; }

/* ========================================
   Utilities
   ======================================== */
.flex { display: flex; }
.flex-center { align-items: center; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-tertiary { color: var(--text-tertiary); }
.text-sm { font-size: var(--fs-sm); }
.font-bold { font-weight: 600; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Empty state */
.empty-state {
  text-align: center;
  padding: var(--space-4xl);
  color: var(--text-tertiary);
}
.empty-state .empty-icon { font-size: 48px; margin-bottom: var(--space-lg); opacity: 0.3; }

/* ========================================
   Mobile Responsive
   ======================================== */
.menu-toggle {
  display: none; width: 36px; height: 36px;
  align-items: center; justify-content: center;
  cursor: pointer; border: none; background: transparent;
  font-size: 22px; color: var(--text-secondary); flex-shrink: 0;
}
.sidebar-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,.35); z-index: 99;
}
@media (max-width: 900px) {
  .menu-toggle { display: flex; }
  .sidebar {
    position: fixed; left: -260px; top: 0; bottom: 0; z-index: 100;
    width: 240px; transition: left .3s ease; box-shadow: 4px 0 20px rgba(0,0,0,.15);
  }
  .sidebar.open { left: 0; }
  .sidebar-overlay.open { display: block; }
  .main-area { width: 100%; }
  .topbar { padding: 0 8px 0 4px; gap: 6px; }
  .topbar .breadcrumb { font-size: 11px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .topbar .user-name { display: none; }
  .page-content { padding: 12px; }
  .form-row { flex-direction: column; gap: 0; }
  .form-actions { flex-direction: column; }
  .form-actions .btn { width: 100%; }
  .stat-cards { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .stat-card { padding: 12px 16px; }
  .stat-card .stat-icon { width: 40px; height: 40px; font-size: 20px; }
  .stat-card .stat-info .stat-value { font-size: 18px; }
  .portrait-grid { grid-template-columns: 1fr; }
  .portrait-header { flex-wrap: wrap; gap: 12px; }
  .portrait-header > div:last-child { margin-left: 0 !important; width: 100%; justify-content: flex-start; }
  .portrait-stat-cards { grid-template-columns: 1fr 1fr; gap: 8px; }
  .portrait-stat .num { font-size: 22px; }
  .info-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .card-header { padding: 12px 16px; flex-wrap: wrap; gap: 8px; }
  .card-body { padding: 16px; }
  table th, table td { padding: 8px 10px; font-size: 12px; }
  .filter-bar { flex-direction: column; align-items: stretch; }
  .filter-bar input, .filter-bar select,
  input[style*="min-width"], select[style*="min-width"] { min-width: 0 !important; width: 100% !important; }
  .table-container { -webkit-overflow-scrolling: touch; }
  table { width: 100%; }
  table.score-compare-table th, table.score-compare-table td { font-size: 11px; padding: 6px; white-space: normal; word-break: break-word; }
  .radar-container svg, .radar-container canvas { max-width: 100% !important; height: auto !important; }
  /* Inline grids → restack */
  [style*="grid-template-columns:repeat(4,1fr)"] { grid-template-columns: repeat(2,1fr) !important; }
  [style*="grid-template-columns:repeat(3,1fr)"] { grid-template-columns: 1fr 1fr !important; }
  [style*="grid-template-columns:1fr 1fr 1fr"] { grid-template-columns: 1fr 1fr !important; }
  [style*="grid-template-columns:2fr 1fr"] { grid-template-columns: 1fr !important; }
  .tabs { overflow-x: auto; -webkit-overflow-scrolling: touch; flex-wrap: nowrap; gap: 0; }
  .tabs .tab { white-space: nowrap; padding: 10px 14px; font-size: 12px; flex-shrink: 0; }
  .cal-grid { font-size: 11px; }
  .cal-cell { min-height: 70px; padding: 3px 4px; }
  .cal-event { font-size: 9px; padding: 2px 3px; }
  .cal-nav { flex-wrap: wrap; gap: 8px; }
  .cal-nav .month { font-size: 16px; min-width: auto; }
  .semester-nav { overflow-x: auto; flex-wrap: nowrap; }
  .semester-nav a { white-space: nowrap; font-size: 12px; padding: 6px 12px; }
  .todo-panel { grid-template-columns: 1fr; }
  .recording-timer { font-size: 32px; }
  .recording-header { flex-wrap: wrap; gap: 12px; }
  .recording-info { grid-template-columns: 1fr 1fr; }
  .recording-info .item { padding: 10px 14px; }
  .waveform { height: 60px; }
  .waveform .bar { width: 4px; }
  .monitor-stats { grid-template-columns: repeat(2, 1fr); }
  .monitor-grid { grid-template-columns: 1fr; }
  .monitor-header { flex-direction: column; gap: 8px; text-align: center; }
  .monitor-header h1 { font-size: 22px; }
  .compare-grid { grid-template-columns: 1fr; }
  .profile-sidebar { width: 100%; }
  .profile-sidebar .p-item { padding: 10px 16px; }
  .dimension-row { flex-wrap: wrap; gap: 8px; }
  .dimension-row .d-name { width: auto; }
  .dimension-row .d-delta { width: auto; }
  .semester-selector-group { flex-direction: column; align-items: stretch; }
  .semester-selector-group select { width: 100%; }
  .semester-selector-group .vs { text-align: center; }
  .donut-wrapper { overflow-x: auto; }
  [style*="max-width:400px"] { max-width: 100% !important; }
  [style*="max-width:200px"] { max-width: 100% !important; }
  .login-page { flex-direction: column; }
  .login-banner { display: none; }
  .login-card { width: 100%; margin: auto; padding: 24px; border-radius: 0; min-height: 100vh; }
  .stat-cards > :nth-child(n+5) { display: none; }
  .radar-container svg { width: 260px; height: 280px; }
  .card-body[style*="flex"] { flex-wrap: wrap; }
  /* Pagination: wrap page buttons */
  [style*="display:flex;gap:4px;"] { flex-wrap: wrap !important; justify-content: center; }
  [style*="padding:6px 12px;border"][style*="border-radius"] { padding: 5px 8px !important; font-size: 12px !important; }
  /* Recording / misc side-by-side → wrap */
  [style*="display:flex;align-items:center;gap:24px;padding:20px 24px;"] { flex-wrap: wrap !important; }
  [style*="display:flex;align-items:center;gap:24px;padding:20px 24px;"] > :last-child { min-width: 0; }
}
@media (max-width: 480px) {
  .stat-cards { grid-template-columns: 1fr 1fr; gap: 8px; }
  .stat-cards > :nth-child(n+3) { display: none; }
  .portrait-stat-cards { grid-template-columns: 1fr 1fr; }
  .info-grid { grid-template-columns: 1fr; }
  .recording-info { grid-template-columns: 1fr; }
  .monitor-stats { grid-template-columns: 1fr 1fr; }
  .cal-cell { min-height: 56px; }
  .cal-event { display: none; }
  .cal-event:first-child { display: block; }
  .page-content { padding: 8px; }
  .card-body { padding: 12px; }
  .topbar { padding: 0 4px; gap: 4px; }
  table th, table td { padding: 6px 6px; font-size: 11px; }
  .radar-container svg { width: 200px; height: 220px; }
  /* Inline 3-col grids → 1 col on very small screens */
  [style*="grid-template-columns:repeat(3,1fr)"] { grid-template-columns: 1fr !important; }
  [style*="grid-template-columns:1fr 1fr 1fr"] { grid-template-columns: 1fr !important; }
}