:root {
  --ui-bg: #f5f7fb;
  --ui-surface: #ffffff;
  --ui-surface-soft: #f8fafc;
  --ui-text: #172033;
  --ui-muted: #667085;
  --ui-border: #e4e7ec;
  --ui-primary: #2563eb;
  --ui-primary-hover: #1d4ed8;
  --ui-primary-soft: #eff6ff;
  --ui-success: #15803d;
  --ui-warning: #b45309;
  --ui-danger: #dc2626;
  --ui-radius: 12px;
  --ui-radius-lg: 18px;
  --ui-shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 8px 24px rgba(16, 24, 40, .06);
  --ui-shadow-lg: 0 18px 48px rgba(16, 24, 40, .12);
  --primary: var(--ui-primary);
  --primary-dark: var(--ui-primary-hover);
  --bg: var(--ui-bg);
  --card: var(--ui-surface);
  --text: var(--ui-text);
  --text-light: var(--ui-muted);
  --border: var(--ui-border);
  --shadow: var(--ui-shadow);
  --radius: var(--ui-radius-lg);
  --radius-sm: var(--ui-radius);
  color-scheme: light;
}

html {
  background: var(--ui-bg);
}

body {
  color: var(--ui-text);
  background: var(--ui-bg);
  font-family: Inter, "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

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

button {
  transition: background-color .18s ease, border-color .18s ease, color .18s ease,
    box-shadow .18s ease, transform .18s ease;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(37, 99, 235, .18);
  outline-offset: 2px;
}

input:not([type="checkbox"]):not([type="radio"]):not([type="file"]),
select,
textarea {
  color: var(--ui-text);
  background: var(--ui-surface);
  border: 1px solid var(--ui-border);
  border-radius: 10px;
  box-shadow: 0 1px 2px rgba(16, 24, 40, .03);
}

input:not([type="checkbox"]):not([type="radio"]):not([type="file"]):focus,
select:focus,
textarea:focus {
  border-color: #84adff;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, .12);
  outline: none;
}

table {
  border-color: var(--ui-border);
}

th {
  color: #475467;
  background: var(--ui-surface-soft);
  font-weight: 600;
}

/* Shared native controls */
.btn,
.admin-btn,
.logout-btn,
.top-nav button,
.header button,
.toolbar button,
.modal-actions button {
  border-radius: 10px;
  box-shadow: none;
}

.btn-primary,
.save-btn {
  color: #fff;
  background: var(--ui-primary);
}

.btn-primary:hover,
.save-btn:hover {
  background: var(--ui-primary-hover);
}

.btn-secondary,
.cancel-btn {
  color: #344054;
  background: var(--ui-surface);
  border: 1px solid var(--ui-border);
}

.btn-danger {
  color: #fff;
  background: var(--ui-danger);
}

.card,
.section,
.panel-card,
.content-area,
.sidebar,
.top-toolbar,
.rank-panel,
.chart-panel {
  border: 1px solid var(--ui-border);
  box-shadow: var(--ui-shadow);
}

.modal-content,
.modal-box,
.modal-dialog,
.password-modal-content,
.auction-modal-card,
.seat-picker-dialog,
.el-dialog {
  border: 1px solid var(--ui-border);
  border-radius: var(--ui-radius-lg);
  box-shadow: var(--ui-shadow-lg);
}

.modal-overlay,
.seat-picker-modal,
.auction-overlay {
  background: rgba(16, 24, 40, .48);
  backdrop-filter: blur(3px);
}

/* Login */
body.ui-login {
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 15%, rgba(37, 99, 235, .09), transparent 28%),
    radial-gradient(circle at 85% 85%, rgba(14, 165, 233, .08), transparent 32%),
    var(--ui-bg);
}

.ui-login .wrap {
  border: 1px solid rgba(228, 231, 236, .9);
  border-radius: 20px;
  background: rgba(255, 255, 255, .96);
  box-shadow: var(--ui-shadow-lg);
}

.ui-login .wrap::before {
  display: block;
  width: 42px;
  height: 4px;
  margin: -6px auto 22px;
  border-radius: 999px;
  background: var(--ui-primary);
  content: "";
}

.ui-login .tab {
  color: #475467;
  background: #f8fafc;
  border: 1px solid var(--ui-border);
  border-radius: 9px;
}

.ui-login .tab:hover {
  color: var(--ui-primary);
  background: var(--ui-primary-soft);
}

.ui-login .tab.active {
  color: #fff;
  background: var(--ui-primary);
  border-color: var(--ui-primary);
}

.ui-login .btn {
  background: var(--ui-primary);
  border-radius: 10px;
  box-shadow: 0 5px 12px rgba(37, 99, 235, .18);
}

.ui-login .btn:hover {
  background: var(--ui-primary-hover);
  transform: translateY(-1px);
}

/* Home */
body.ui-home {
  min-height: 100vh;
  background: var(--ui-bg);
}

.ui-home .top-bar {
  max-width: 1080px;
  margin-bottom: 26px;
  padding: 12px 0;
  border-bottom: 1px solid var(--ui-border);
}

.ui-home .top-bar h1,
.ui-home .hero,
.ui-home .student-panel {
  color: var(--ui-text);
}

.ui-home .top-actions button {
  color: #344054;
  background: var(--ui-surface);
  border: 1px solid var(--ui-border);
  box-shadow: 0 1px 2px rgba(16, 24, 40, .04);
}

.ui-home .role-pill {
  color: var(--ui-primary);
  background: var(--ui-primary-soft);
  border: 1px solid #dbeafe;
}

.ui-home .hero {
  margin-bottom: 28px;
}

.ui-home .hero h2 {
  letter-spacing: -.03em;
}

.ui-home .hero p,
.ui-home footer {
  color: var(--ui-muted);
}

.site-icp-footer {
  text-align: center;
  font-size: 12px;
  line-height: 1.5;
}

.site-icp-footer a {
  color: inherit;
  text-decoration: none;
}

.site-icp-footer a:hover {
  text-decoration: underline;
}

.ui-login .site-icp-footer {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 20;
  padding: 10px 12px calc(10px + env(safe-area-inset-bottom, 0px));
  color: #64748b;
  background: rgba(248, 250, 252, 0.92);
  border-top: 1px solid #e5e7eb;
}

.ui-login .site-icp-footer a {
  color: #475569;
}

.ui-home .status {
  color: var(--ui-success);
}

.ui-home .container,
.ui-home .top-bar,
.ui-home .admin-panel,
.ui-home .student-panel {
  max-width: 1080px;
}

.ui-home .grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.ui-home .card {
  padding: 24px;
  border-radius: 16px;
  box-shadow: var(--ui-shadow);
}

.ui-home .card:hover {
  border-color: #cbd5e1;
  box-shadow: 0 10px 28px rgba(16, 24, 40, .09);
  transform: translateY(-2px);
}

.ui-home .card .icon {
  font-size: 1.8rem;
}

.ui-home .badge {
  color: var(--ui-primary);
  background: var(--ui-primary-soft);
}

.ui-home .admin-panel,
.ui-home .student-panel {
  color: var(--ui-text);
  background: var(--ui-surface);
  border: 1px solid var(--ui-border);
  box-shadow: var(--ui-shadow);
}

.ui-home .admin-panel h3,
.ui-home .admin-panel p {
  color: var(--ui-text);
}

.ui-home .admin-panel button,
.ui-home .student-panel button {
  color: #fff;
  background: var(--ui-primary);
}

.ui-home .admin-panel button:hover,
.ui-home .student-panel button:hover {
  background: var(--ui-primary-hover);
}

.ui-home .org-panel {
  color: var(--ui-text);
  background: var(--ui-surface);
  border: 1px solid var(--ui-border);
  box-shadow: var(--ui-shadow);
}

.ui-home .org-panel h3,
.ui-home .sem-card,
.ui-home .sem-card .sem-title {
  color: var(--ui-text);
}

.ui-home .org-panel select,
.ui-home .org-panel input[type="text"],
.ui-home .org-panel input[type="number"] {
  color: var(--ui-text);
  background: var(--ui-surface);
  border: 1px solid var(--ui-border);
}

.ui-home .org-panel .ghost {
  color: var(--ui-primary);
  background: var(--ui-primary-soft);
  border: 1px solid #dbeafe;
}

.ui-home .sem-card {
  background: var(--ui-surface-soft);
  border: 1px solid var(--ui-border);
}

.help-tip {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1px solid #94a3b8;
  color: #334155;
  background: #fff;
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  cursor: help;
  flex-shrink: 0;
  user-select: none;
}

.help-tip::after {
  content: attr(data-tip);
  position: absolute;
  right: calc(100% + 8px);
  top: 50%;
  transform: translateY(-50%);
  width: 260px;
  max-width: min(280px, 70vw);
  padding: 8px 10px;
  border-radius: 8px;
  background: #0f172a;
  color: #fff;
  font-size: 12px;
  font-weight: 400;
  line-height: 1.45;
  white-space: normal;
  text-align: left;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  z-index: 40;
  box-shadow: 0 8px 20px rgba(15, 23, 42, .18);
}

.help-tip:hover::after,
.help-tip:focus::after,
.help-tip:focus-visible::after {
  opacity: 1;
  visibility: visible;
}

.ui-home #accountsBox,
.ui-home #accessLogsBox {
  color: var(--ui-text);
  background: var(--ui-surface-soft);
  border: 1px solid var(--ui-border);
}

.ui-home #accountsBox th,
.ui-home #accountsBox td,
.ui-home #accessLogsBox th,
.ui-home #accessLogsBox td {
  border-color: var(--ui-border);
}

.ui-home .pwd-plain {
  color: var(--ui-warning);
}

/* Parent */
body.ui-parent {
  min-height: 100vh;
  color: var(--ui-text);
  background: var(--ui-bg);
}

.ui-parent .top {
  max-width: 920px;
  padding: 12px 0;
  color: var(--ui-text);
  border-bottom: 1px solid var(--ui-border);
}

.ui-parent .top button {
  color: #344054;
  background: #fff;
  border: 1px solid var(--ui-border);
  border-radius: 10px;
}

.ui-parent .card {
  max-width: 920px;
  padding: 28px;
  border-radius: 18px;
  box-shadow: var(--ui-shadow);
}

.ui-parent h3 {
  color: var(--ui-text);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--ui-border);
}

.ui-parent .loading {
  color: var(--ui-muted);
}

/* Score analysis / Element Plus */
body.ui-scores {
  background: var(--ui-bg);
}

.ui-scores .top-toolbar,
.ui-scores .rank-panel,
.ui-scores .chart-panel {
  border-radius: 14px;
  box-shadow: var(--ui-shadow);
}

.ui-scores .student-item {
  background: #fff;
  border: 1px solid transparent;
  border-radius: 10px;
}

.ui-scores .student-item:hover {
  background: var(--ui-primary-soft);
  border-color: #dbeafe;
}

.ui-scores .student-score {
  color: #344054;
  background: #f2f4f7;
}

.ui-scores .chart-evaluation,
.ui-scores .insight-panel,
.ui-scores .insight-text {
  background: var(--ui-surface-soft);
  border: 1px solid var(--ui-border);
  border-radius: 10px;
}

.ui-scores .el-button {
  border-radius: 9px;
}

.ui-scores .el-button--primary {
  --el-button-bg-color: var(--ui-primary);
  --el-button-border-color: var(--ui-primary);
  --el-button-hover-bg-color: var(--ui-primary-hover);
  --el-button-hover-border-color: var(--ui-primary-hover);
}

/* Quant */
body.ui-quant {
  align-items: flex-start;
  background: var(--ui-bg);
}

.ui-quant .app {
  max-width: 1380px;
  padding: 20px;
  background: var(--ui-surface);
  border: 1px solid var(--ui-border);
  border-radius: 18px;
  box-shadow: var(--ui-shadow);
}

.ui-quant .toolbar {
  padding: 12px;
  margin-bottom: 20px;
  background: var(--ui-surface-soft);
  border: 1px solid var(--ui-border);
  border-radius: 14px;
  box-shadow: none;
  gap: 10px;
}

.ui-quant .tool-group {
  padding: 5px 10px;
  background: #fff;
  border: 1px solid var(--ui-border);
  border-radius: 10px;
  box-shadow: none;
}

.ui-quant .toolbar button {
  color: #344054;
  background: #fff;
  border: 1px solid var(--ui-border);
  border-radius: 9px;
  box-shadow: none;
}

.ui-quant .toolbar button:hover {
  color: var(--ui-primary);
  background: var(--ui-primary-soft);
  border-color: #bfdbfe;
  transform: none;
}

.ui-quant .toolbar button.selected,
.ui-quant .toolbar button.class-manage-btn {
  color: #fff;
  background: var(--ui-primary);
  border-color: var(--ui-primary);
}

.ui-quant .toolbar button.selected:hover,
.ui-quant .toolbar button.class-manage-btn:hover {
  color: #fff;
  background: var(--ui-primary-hover);
}

.ui-quant .seat {
  border-color: #d0d5dd;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(16, 24, 40, .06);
}

.ui-quant .seat.own-seat {
  cursor: pointer;
  box-shadow: 0 0 0 2px rgba(37, 99, 235, .28);
}

.ui-quant .seat.own-seat .name {
  color: #1d4ed8;
}

.ui-quant .seat.seat-locked,
.ui-quant .seat.seat-locked:active {
  cursor: default;
}

.ui-quant .unseated-rail {
  background: #fff7ed;
  border-color: #fdba74;
  box-shadow: none;
  border-radius: 14px;
}

.ui-quant .unseated-card {
  border-radius: 10px;
  box-shadow: none;
}

.ui-quant .modal {
  background: rgba(16, 24, 40, .46);
  backdrop-filter: blur(3px);
}

.ui-quant .modal-content {
  background: #fff;
}

.ui-quant .field-item,
.ui-quant .position-item {
  background: var(--ui-surface-soft);
  border: 1px solid var(--ui-border);
  border-radius: 12px;
}

.ui-quant .modal-actions .save-btn,
.ui-quant .score-btn {
  color: #fff;
  background: var(--ui-primary);
  border: 1px solid var(--ui-primary);
  box-shadow: none;
}

.ui-quant .modal-actions .cancel-btn {
  color: #344054;
  background: #fff;
  border: 1px solid var(--ui-border);
  box-shadow: none;
}

/* Homework */
body.ui-homework {
  background: var(--ui-bg);
}

.ui-homework .navbar {
  border-bottom: 1px solid var(--ui-border);
  box-shadow: 0 1px 8px rgba(16, 24, 40, .04);
}

.ui-homework .logo {
  color: var(--ui-text);
}

.ui-homework .sidebar,
.ui-homework .content-area {
  border: 1px solid var(--ui-border);
  box-shadow: var(--ui-shadow);
}

.ui-homework .subject-btn {
  background: transparent;
  border: 1px solid transparent;
}

.ui-homework .subject-btn:hover {
  background: var(--ui-surface-soft);
  border-color: var(--ui-border);
}

.ui-homework .subject-btn.active {
  color: var(--ui-primary);
  background: var(--ui-primary-soft);
  border-color: #bfdbfe;
}

.ui-homework .info-card,
.ui-homework .task-card {
  background: var(--ui-surface-soft);
  border-color: var(--ui-border);
}

.ui-homework .modal-box {
  color: var(--ui-text);
  background: var(--ui-surface);
}

.ui-homework .btn-primary,
.ui-homework .btn-success {
  background: var(--ui-primary);
}

.ui-homework .btn-warning {
  color: #92400e;
  background: #fef3c7;
}

.ui-homework .btn-outline {
  color: var(--ui-primary);
  background: #fff;
  border-color: #bfdbfe;
}

/* Behavior */
body.ui-behavior {
  background: var(--ui-bg);
}

.ui-behavior .header {
  color: var(--ui-text);
  background: var(--ui-surface);
  border-bottom: 1px solid var(--ui-border);
}

.ui-behavior .header a {
  color: var(--ui-primary);
}

.ui-behavior .tabs {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom-color: var(--ui-border);
  box-shadow: 0 2px 8px rgba(16, 24, 40, .03);
}

.ui-behavior .tab {
  color: #475467;
  background: transparent;
}

.ui-behavior .tab:hover {
  background: var(--ui-surface-soft);
}

.ui-behavior .tab.active {
  color: var(--ui-primary);
  background: var(--ui-primary-soft);
}

.ui-behavior .card {
  border-radius: 14px;
  box-shadow: var(--ui-shadow);
}

.ui-behavior .stat {
  background: var(--ui-surface-soft);
  border: 1px solid var(--ui-border);
}

.ui-behavior .stat .val {
  color: var(--ui-primary);
}

.ui-behavior .seat-picker-dialog {
  color: var(--ui-text);
  background: var(--ui-surface);
}

/* Admission */
body.ui-admission {
  background: var(--ui-bg);
  color: var(--ui-text);
}

.ui-admission .top-nav {
  max-width: 1180px;
}

.ui-admission .top-nav button,
.ui-admission button {
  background: var(--ui-primary);
  border-radius: 9px;
}

.ui-admission button:hover {
  background: var(--ui-primary-hover);
}

.ui-admission .top-nav button {
  color: #344054;
  background: #fff;
  border: 1px solid var(--ui-border);
}

.ui-admission .container {
  max-width: 1180px;
  border: 1px solid var(--ui-border);
  border-radius: 18px;
  box-shadow: var(--ui-shadow);
}

.ui-admission h1 {
  color: var(--ui-text);
  letter-spacing: -.02em;
}

.ui-admission .section {
  background: var(--ui-surface-soft);
  border-color: var(--ui-border);
  border-radius: 12px;
  box-shadow: none;
}

.ui-admission .btn-draw,
.ui-admission .btn-target,
.ui-admission .ai-btn {
  background: var(--ui-primary);
}

.ui-admission .target-banner {
  color: #1e40af;
  background: var(--ui-primary-soft);
  border-color: #bfdbfe;
}

/* Decibel keeps its visualization; controls receive the common visual language. */
.ui-decibel .decibel-display,
.ui-decibel .control-panel,
.ui-decibel .settings-panel,
.ui-decibel .admin-panel,
.ui-decibel .modal-content {
  border: 1px solid rgba(228, 231, 236, .95);
  border-radius: 18px;
  box-shadow: var(--ui-shadow-lg);
}

.ui-decibel .modal-dialog,
.ui-decibel .password-modal-content {
  color: var(--ui-text);
  background: var(--ui-surface);
}

.ui-decibel button {
  border-radius: 9px;
  box-shadow: none;
}

@media (max-width: 760px) {
  body {
    padding-left: 10px;
    padding-right: 10px;
  }

  .ui-home .top-bar,
  .ui-home .hero {
    text-align: left;
  }

  .ui-home .grid {
    grid-template-columns: 1fr;
  }

  .ui-parent .card {
    padding: 18px 14px;
    overflow-x: auto;
  }

  .ui-scores {
    height: auto;
    padding: 10px;
  }

  .ui-scores #app {
    height: auto;
  }

  .ui-scores .main-panel {
    flex-direction: column;
  }

  .ui-scores .rank-panel {
    width: 100%;
    min-height: 360px;
  }

  .ui-scores .chart-panel {
    min-height: 620px;
  }

  .ui-quant .app {
    padding: 12px;
    border-radius: 14px;
  }
}