:root {
  --tool-rail-width: 268px;
  --result-drawer-height: clamp(260px, 34vh, 360px);
  --chat-drawer-width: clamp(440px, 38vw, 620px);
  --bg: #eef3f8;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --surface-3: #e8eef6;
  --canvas-bg: #f8fbff;
  --text: #172033;
  --muted: #607086;
  --subtle: #7c8ca2;
  --border: #d7e0ea;
  --border-strong: #a9b8ca;
  --primary: #0f6fbf;
  --primary-strong: #075fa8;
  --primary-soft: rgba(15, 111, 191, 0.1);
  --accent: #b7791f;
  --danger: #c2415b;
  --success: #15803d;
  --warning: #b7791f;
  --shadow: 0 16px 42px rgba(36, 52, 71, 0.16);
  --focus: 0 0 0 3px rgba(15, 111, 191, 0.2);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  min-width: 320px;
  height: 100vh;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.5;
}

button,
input,
select {
  font: inherit;
}

button {
  touch-action: manipulation;
}

#app {
  display: flex;
  width: 100%;
  height: 100vh;
  background:
    radial-gradient(circle at 18% 0%, rgba(15, 111, 191, 0.11), transparent 28rem),
    linear-gradient(180deg, #f6f9fc 0%, #e9f0f7 100%);
}

#toolbar {
  position: relative;
  z-index: 10;
  display: flex;
  flex: 0 0 var(--tool-rail-width);
  width: var(--tool-rail-width);
  height: 100vh;
  flex-direction: column;
  align-items: stretch;
  gap: 12px;
  padding: 16px 12px;
  overflow-x: hidden;
  overflow-y: auto;
  border-right: 1px solid rgba(169, 184, 202, 0.78);
  background: rgba(248, 251, 255, 0.97);
  box-shadow: 8px 0 28px rgba(36, 52, 71, 0.1);
  font-size: 15px;
}

.toolbar-brand {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
  padding: 2px 4px 14px;
  border-bottom: 1px solid var(--border);
}

.brand-title {
  font-size: 18px;
  font-weight: 700;
  color: #0f172a;
}

.brand-subtitle {
  margin-top: 2px;
  font-size: 12px;
  color: var(--muted);
}

.tool-group {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
}

.tool-group:last-child {
  border-bottom: 1px solid var(--border);
}

.tool-group-label {
  display: block;
  grid-column: 1 / -1;
  margin-bottom: 3px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.tool-btn {
  min-height: 42px;
  padding: 8px 9px;
  border: 1px solid rgba(169, 184, 202, 0.76);
  border-radius: 6px;
  background: #f8fafc;
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.15s ease;
}

.tool-btn:hover {
  border-color: rgba(15, 111, 191, 0.48);
  background: #eef6ff;
}

.tool-btn:focus-visible,
.tab-btn:focus-visible,
.btn-small:focus-visible,
.btn-ok:focus-visible,
.btn-cancel:focus-visible,
.np-delete-btn:focus-visible,
#btn-close-result:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

.tool-btn.active {
  border-color: rgba(15, 111, 191, 0.72);
  background: var(--primary-soft);
  color: #075fa8;
}

.tool-btn.primary {
  width: 100%;
  min-height: 46px;
  border-color: #075fa8;
  background: linear-gradient(180deg, #1678c8, #075fa8);
  color: #ffffff;
  font-weight: 800;
}

.tool-btn.primary:hover {
  background: linear-gradient(180deg, #248bd8, #0f6fbf);
}

.tool-btn:disabled {
  cursor: wait;
  opacity: 0.68;
}

.scale-group {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
}

.scale-group label {
  display: block;
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.scale-group input[type="range"] {
  width: 100%;
  min-width: 0;
  accent-color: var(--primary);
}

#result-scale-value {
  min-width: 38px;
  color: #075fa8;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.result-tools {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.solve-group,
.account-group {
  grid-template-columns: 1fr;
}

.report-btn {
  width: 100%;
  border-color: rgba(183, 121, 31, 0.55);
  background: #fff8e8;
  color: #8a5815;
  font-weight: 800;
}

.report-btn:hover:not(:disabled) {
  border-color: #b7791f;
  background: #fff1cf;
}

.report-btn:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.report-progress-list {
  display: grid;
  gap: 8px;
  margin: 16px 0 4px;
  color: var(--muted);
  font-size: 13px;
}

.report-progress-list span.active { color: var(--primary-strong); font-weight: 800; }
.report-progress-list span.done { color: var(--success); }

.report-name-modal {
  width: min(460px, 100%);
}

.report-name-modal #report-name-input {
  min-height: 44px;
  font-size: 15px;
}

.report-name-modal #report-name-input[aria-invalid="true"] {
  border-color: #b42318;
  box-shadow: 0 0 0 3px rgba(180, 35, 24, 0.12);
}

.report-name-error {
  min-height: 20px;
  margin: 5px 0 0;
  color: #b42318;
  font-size: 12px;
  line-height: 1.5;
}

.chat-toggle {
  width: 100%;
  min-height: 44px;
}

#canvas-container {
  position: relative;
  flex: 1;
  min-width: 0;
}

#main-canvas {
  display: block;
  width: 100%;
  height: 100%;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.12), rgba(239, 246, 255, 0.78)),
    var(--canvas-bg);
}

#hover-info {
  position: absolute;
  left: 14px;
  bottom: 14px;
  max-width: calc(100% - 28px);
  padding: 7px 11px;
  border: 1px solid rgba(169, 184, 202, 0.72);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--muted);
  font-size: 12px;
  pointer-events: none;
  box-shadow: 0 10px 26px rgba(36, 52, 71, 0.14);
}

#result-panel {
  position: fixed;
  left: var(--tool-rail-width);
  right: 0;
  bottom: 0;
  z-index: 24;
  display: flex;
  width: auto;
  max-width: none;
  height: var(--result-drawer-height);
  flex-direction: column;
  border-top: 1px solid rgba(169, 184, 202, 0.78);
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 -16px 42px rgba(36, 52, 71, 0.14);
  transform: translateY(0);
  transition: transform 0.22s ease;
}

#result-panel.collapsed {
  width: auto;
  transform: translateY(calc(100% + 2px));
}

.drawer-edge-handle {
  position: fixed;
  z-index: 32;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid rgba(15, 111, 191, 0.38);
  background: rgba(255, 255, 255, 0.98);
  color: var(--primary-strong);
  box-shadow: 0 8px 24px rgba(36, 52, 71, 0.16);
  cursor: pointer;
  font-size: 13px;
  font-weight: 800;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.drawer-edge-handle:hover,
.drawer-edge-handle:focus-visible {
  border-color: var(--primary);
  background: #eef6ff;
  outline: none;
  box-shadow: var(--focus), 0 8px 24px rgba(36, 52, 71, 0.16);
}

.drawer-edge-handle[aria-expanded="true"] {
  border-color: var(--primary-strong);
  background: var(--primary);
  color: #ffffff;
}

#result-drawer-handle {
  left: calc(var(--tool-rail-width) + (100vw - var(--tool-rail-width)) / 2);
  bottom: 0;
  min-width: 116px;
  border-bottom: 0;
  border-radius: 8px 8px 0 0;
  transform: translateX(-50%);
}

#result-header {
  display: grid;
  grid-template-columns: minmax(220px, 0.7fr) minmax(360px, 1.3fr);
  align-items: center;
  gap: 16px;
  flex: 0 0 auto;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}

.result-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

#result-header h3 {
  color: #0f172a;
  font-size: 17px;
  font-weight: 800;
}

#result-header p {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
}

#btn-close-result {
  min-height: 34px;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #f8fafc;
  color: var(--muted);
  cursor: pointer;
}

#btn-close-result:hover {
  color: var(--text);
  border-color: var(--border-strong);
}

.result-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin-top: 0;
  padding: 4px;
  border: 1px solid rgba(169, 184, 202, 0.65);
  border-radius: 8px;
  background: #eef3f8;
}

.tab-btn {
  min-height: 34px;
  border: 0;
  border-radius: 5px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-weight: 700;
}

.tab-btn.active {
  background: var(--primary-soft);
  color: #075fa8;
}

#result-content {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 8px 14px 52px;
}

#result-panel:not(.collapsed) + #canvas-container #hover-info {
  bottom: calc(var(--result-drawer-height) + 14px);
}

#app:has(#result-panel:not(.collapsed)) #node-props {
  bottom: calc(var(--result-drawer-height) + 14px);
}

.tab-content {
  display: none;
  min-width: 100%;
  overflow-x: auto;
}

.tab-content.active {
  display: block;
}

table {
  width: 100%;
  min-width: 320px;
  border-collapse: collapse;
  font-size: 13px;
}

th,
td {
  padding: 9px 8px;
  border-bottom: 1px solid rgba(169, 184, 202, 0.56);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

th:first-child,
td:first-child {
  text-align: left;
}

th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: rgba(255, 255, 255, 0.98);
  color: #075fa8;
  font-size: 12px;
  font-weight: 800;
}

td {
  color: var(--text);
}

#modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(36, 52, 71, 0.26);
}

#modal-overlay.hidden {
  display: none;
}

#modal-box {
  width: min(520px, 100%);
  max-height: min(86vh, 760px);
  overflow-y: auto;
  padding: 22px;
  border: 1px solid rgba(169, 184, 202, 0.72);
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 24px 70px rgba(36, 52, 71, 0.22);
}

#modal-box h3 {
  margin-bottom: 14px;
  color: #0f172a;
  font-size: 18px;
}

#modal-box h4 {
  margin: 18px 0 8px;
  color: #075fa8;
  font-size: 13px;
  font-weight: 800;
}

#modal-box label {
  display: block;
  margin: 10px 0 5px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

.modal-note {
  margin: 8px 0 4px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

#modal-box input,
#modal-box select,
.np-row input,
.np-row select {
  min-height: 38px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #ffffff;
  color: var(--text);
}

#modal-box input,
#modal-box select {
  width: 100%;
  padding: 7px 10px;
}

.load-list {
  display: grid;
  gap: 8px;
  margin-bottom: 8px;
}

.load-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 10px;
  border: 1px solid rgba(169, 184, 202, 0.7);
  border-radius: 7px;
  background: #f8fafc;
  color: var(--text);
  font-size: 13px;
}

.load-row span {
  display: inline-flex;
  flex: 0 0 auto;
  gap: 6px;
}

.muted {
  padding: 10px;
  border: 1px dashed rgba(169, 184, 202, 0.9);
  border-radius: 7px;
  color: var(--muted);
  font-size: 13px;
}

.btn-small {
  min-height: 30px;
  padding: 4px 9px;
  border: 1px solid rgba(15, 111, 191, 0.42);
  border-radius: 5px;
  background: rgba(15, 111, 191, 0.08);
  color: #075fa8;
  cursor: pointer;
}

#modal-box > .btn-ok,
.modal-btns .btn-ok {
  border: 0;
  border-radius: 6px;
  background: var(--primary-strong);
  color: #ffffff;
  cursor: pointer;
  font-weight: 800;
}

#modal-box > .btn-ok {
  width: 100%;
  min-height: 40px;
  margin-top: 10px;
}

.modal-btns {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 18px;
}

.modal-btns button {
  min-height: 38px;
  padding: 7px 16px;
  cursor: pointer;
}

.modal-btns .btn-cancel {
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #f8fafc;
  color: var(--text);
}

#toast {
  position: fixed;
  top: 18px;
  left: 50%;
  z-index: 200;
  max-width: min(520px, calc(100vw - 28px));
  transform: translateX(-50%);
  padding: 10px 16px;
  border: 1px solid rgba(15, 111, 191, 0.3);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.98);
  color: #075fa8;
  box-shadow: var(--shadow);
  font-size: 13px;
  opacity: 1;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

#toast.hidden {
  opacity: 0;
  transform: translate(-50%, -8px);
}

#node-props {
  position: absolute;
  right: 14px;
  bottom: 16px;
  z-index: 20;
  width: min(320px, calc(100vw - 28px));
  padding: 14px;
  border: 1px solid rgba(169, 184, 202, 0.72);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.97);
  box-shadow: var(--shadow);
  transition: opacity 0.18s ease, transform 0.18s ease;
}

#node-props.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
}

#np-title {
  margin-bottom: 10px;
  color: #0f172a;
  font-size: 14px;
  font-weight: 800;
}

.np-info-line {
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 12px;
}

.np-row {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) 42px;
  align-items: center;
  gap: 8px;
  margin: 7px 0;
}

.np-row label {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.np-row input,
.np-row select {
  width: 100%;
  padding: 6px 8px;
  text-align: right;
}

.np-row select {
  grid-column: span 2;
  text-align: left;
}

.np-unit {
  color: var(--subtle);
  font-size: 12px;
}

.np-delete-btn {
  width: 100%;
  min-height: 38px;
  margin-top: 12px;
  border: 1px solid rgba(194, 65, 91, 0.45);
  border-radius: 6px;
  background: rgba(194, 65, 91, 0.08);
  color: #9f1239;
  cursor: pointer;
  font-weight: 800;
}

.np-delete-btn:hover {
  background: rgba(194, 65, 91, 0.14);
}

@media (max-width: 1100px) {
  :root {
    --tool-rail-width: 240px;
    --chat-drawer-width: min(520px, 92vw);
  }

  #toolbar {
    padding: 12px 10px;
  }

  .toolbar-brand {
    min-width: 0;
  }

  #result-panel {
    width: auto;
    max-width: none;
  }
}

@media (max-width: 760px) {
  :root {
    --result-drawer-height: min(52dvh, 440px);
    --chat-drawer-width: 100vw;
  }

  body {
    overflow: auto;
  }

  #app {
    flex-direction: column;
    height: auto;
    min-height: 100dvh;
  }

  #toolbar {
    flex: 0 0 auto;
    width: 100%;
    height: auto;
    max-height: none;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: 8px;
    padding: 8px;
    overflow: visible;
    border-right: 0;
    border-bottom: 1px solid rgba(169, 184, 202, 0.78);
    box-shadow: 0 8px 24px rgba(36, 52, 71, 0.08);
  }

  .toolbar-brand {
    flex: 1 0 100%;
    padding: 0 0 6px;
    border-bottom: 1px solid var(--border);
  }

  .tool-group {
    flex: 1 1 220px;
    padding: 8px;
  }

  .result-tools {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .tool-btn {
    min-height: 44px;
  }

  .chat-toggle {
    flex: 1 1 220px;
  }

  #canvas-container {
    flex: 1 1 70dvh;
    min-height: 70dvh;
  }

  #toast {
    top: 12px;
  }

  #result-panel {
    position: fixed;
    left: 0;
    right: 0;
    top: auto;
    bottom: 0;
    width: auto;
    max-width: none;
    height: min(52dvh, 440px);
  }

  #result-header {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  #result-panel:not(.collapsed) + #canvas-container #hover-info {
    bottom: calc(min(52dvh, 440px) + 12px);
  }

  #node-props {
    left: 8px;
    right: 8px;
    bottom: 8px;
    width: auto;
  }
}

/* ---- 典型结构案例库 ---- */

.example-library-trigger {
  grid-column: 1 / -1;
  min-height: 44px;
  border-color: rgba(183, 121, 31, 0.48);
  background: linear-gradient(180deg, #fffdf7, #fff7e6);
  color: #8a5815;
}

.example-library-trigger:hover {
  border-color: rgba(183, 121, 31, 0.72);
  background: #fff3d8;
}

.empty-model-guide {
  position: absolute;
  z-index: 6;
  top: 50%;
  left: 50%;
  width: min(900px, calc(100% - 48px));
  max-height: calc(100% - 48px);
  overflow: auto;
  padding: 24px;
  border: 1px solid rgba(169, 184, 202, 0.82);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 24px 64px rgba(36, 52, 71, 0.2);
  transform: translate(-50%, -50%);
}

.empty-model-guide.hidden,
.example-learning-card.hidden,
.example-library-overlay.hidden {
  display: none;
}

.empty-guide-copy {
  max-width: 650px;
}

.empty-guide-kicker,
.example-library-kicker {
  display: block;
  margin-bottom: 4px;
  color: #8a5815;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.empty-guide-copy h1 {
  margin: 0;
  color: #0f172a;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.25;
}

.empty-guide-copy p {
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.empty-guide-section-label {
  margin-top: 20px;
  color: #475569;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.empty-guide-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: stretch;
  gap: 12px;
  margin-top: 8px;
}

.empty-guide-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.example-primary-btn,
.example-secondary-btn,
.example-view-btn,
.example-card-load,
.example-compact-card,
.example-icon-btn,
#btn-reset-example-filters,
.learning-card-toggle,
.learning-card-end {
  min-height: 44px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 700;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.example-primary-btn,
.example-card-load {
  padding: 9px 16px;
  border: 1px solid #075fa8;
  background: linear-gradient(180deg, #1678c8, #075fa8);
  color: #fff;
}

.example-primary-btn:hover,
.example-card-load:hover {
  background: linear-gradient(180deg, #248bd8, #0f6fbf);
}

.example-secondary-btn {
  padding: 9px 16px;
  border: 1px solid var(--border-strong);
  background: #fff;
  color: var(--text);
}

.example-secondary-btn:hover {
  border-color: rgba(15, 111, 191, 0.52);
  background: #eef6ff;
}

.example-compact-card {
  display: grid;
  grid-template-rows: 96px minmax(92px, auto);
  align-self: stretch;
  width: 100%;
  min-width: 0;
  min-height: 188px;
  overflow: hidden;
  padding: 0;
  border: 1px solid var(--border);
  background: #fbfdff;
  color: var(--text);
  text-align: left;
}

.example-compact-card:hover {
  border-color: rgba(15, 111, 191, 0.5);
  box-shadow: 0 10px 24px rgba(36, 52, 71, 0.12);
}

.example-compact-preview {
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #f7fbff, #edf4fb);
}

.example-compact-preview svg,
.example-preview svg {
  display: block;
  width: 100%;
  height: 100%;
}

.example-compact-copy {
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: flex-start;
  padding: 10px 12px 12px;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.example-compact-copy strong {
  display: block;
  color: #172033;
  font-size: 13px;
  line-height: 1.45;
  white-space: normal;
}

.example-compact-copy span {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.55;
  white-space: normal;
}

.example-library-overlay {
  position: fixed;
  z-index: 1000;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 72px clamp(32px, 5vw, 72px);
  background: rgba(15, 23, 42, 0.56);
  backdrop-filter: blur(3px);
}

body.example-library-open {
  overflow: hidden;
}

.example-library-dialog {
  display: flex;
  width: min(1080px, 100%);
  height: min(660px, calc(100dvh - 144px));
  max-height: min(660px, calc(100dvh - 144px));
  flex-direction: column;
  overflow: hidden;
  border: 1px solid rgba(169, 184, 202, 0.9);
  border-radius: 16px;
  background: #f8fafc;
  box-shadow: 0 28px 80px rgba(15, 23, 42, 0.34);
}

.example-library-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 20px 14px;
  border-bottom: 1px solid var(--border);
  background: #fff;
}

.example-library-header h2 {
  margin: 0;
  color: #0f172a;
  font-size: 22px;
  line-height: 1.3;
}

.example-library-header p {
  margin-top: 6px;
  color: var(--muted);
}

.example-icon-btn {
  flex: 0 0 44px;
  width: 44px;
  padding: 0;
  border: 1px solid var(--border);
  background: #fff;
  color: #475569;
  font-size: 25px;
  line-height: 1;
}

.example-icon-btn:hover {
  border-color: var(--border-strong);
  background: #eef3f8;
  color: #0f172a;
}

.example-library-filters {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding: 12px 20px 10px;
  background: #f8fafc;
}

.example-library-filters label {
  display: grid;
  gap: 5px;
  color: #475569;
  font-size: 12px;
  font-weight: 700;
}

.example-library-filters input {
  width: 100%;
  min-height: 44px;
  padding: 9px 11px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  font-size: 14px;
}

.example-library-result-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

#btn-reset-example-filters {
  min-height: 36px;
  padding: 6px 10px;
  border: 0;
  background: transparent;
  color: #075fa8;
}

#btn-reset-example-filters:hover {
  background: var(--primary-soft);
}

.example-library-grid {
  display: grid;
  flex: 1;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-auto-rows: max-content;
  align-content: start;
  align-items: stretch;
  gap: 14px;
  min-height: 0;
  max-height: 450px;
  padding: 0 20px 20px;
  overflow: auto;
}

.example-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 7px 20px rgba(36, 52, 71, 0.08);
}

.example-card:hover {
  border-color: rgba(15, 111, 191, 0.44);
  box-shadow: 0 12px 30px rgba(36, 52, 71, 0.14);
}

.example-preview {
  height: 128px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #f7fbff, #edf4fb);
}

.example-card-body {
  display: flex;
  flex: 1;
  min-width: 0;
  flex-direction: column;
  padding: 13px;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.example-card-meta,
.learning-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.example-badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 3px 8px;
  border: 1px solid #d5e4f2;
  border-radius: 999px;
  background: #eef6ff;
  color: #075fa8;
  font-size: 11px;
  font-weight: 800;
}

.example-badge.difficulty {
  border-color: #ead9b8;
  background: #fff7e6;
  color: #8a5815;
}

.example-card h3 {
  margin-top: 10px;
  color: #172033;
  font-size: 16px;
  line-height: 1.35;
  white-space: normal;
}

.example-card-summary {
  margin-top: 7px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
  white-space: normal;
}

.example-card-goal {
  margin: 12px 0;
  padding: 10px 11px;
  border-left: 3px solid var(--accent);
  background: #fffaf0;
  color: #654411;
  font-size: 12px;
  line-height: 1.55;
  white-space: normal;
}

.example-card-load {
  width: 100%;
  margin-top: auto;
  white-space: normal;
}

.example-library-empty {
  grid-column: 1 / -1;
  display: grid;
  min-height: 220px;
  place-items: center;
  padding: 32px;
  border: 1px dashed var(--border-strong);
  border-radius: 12px;
  background: #fff;
  color: var(--muted);
  text-align: center;
}

.example-learning-card {
  position: absolute;
  z-index: 8;
  top: 18px;
  right: 18px;
  width: min(360px, calc(100% - 36px));
  overflow: hidden;
  border: 1px solid rgba(169, 184, 202, 0.9);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 16px 42px rgba(36, 52, 71, 0.18);
}

.learning-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  padding: 14px 14px 12px;
  border-bottom: 1px solid var(--border);
  background: #fbfdff;
}

.learning-card-header strong {
  display: block;
  color: #172033;
  font-size: 14px;
}

.learning-card-header span {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 11px;
}

.learning-card-actions {
  display: flex;
  gap: 4px;
}

.learning-card-toggle,
.learning-card-end {
  min-width: 44px;
  min-height: 36px;
  padding: 5px 8px;
  border: 0;
  background: transparent;
  color: #075fa8;
  font-size: 12px;
}

.learning-card-end {
  color: var(--muted);
}

.learning-card-toggle:hover,
.learning-card-end:hover {
  background: var(--primary-soft);
}

.learning-card-body {
  padding: 14px;
}

.example-learning-card.is-collapsed .learning-card-body {
  display: none;
}

.learning-card-goal {
  color: #334155;
  font-size: 13px;
  line-height: 1.55;
}

.learning-card-body h4 {
  margin: 13px 0 6px;
  color: #475569;
  font-size: 12px;
}

.learning-card-body ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.65;
}

.learning-card-body .example-primary-btn {
  width: 100%;
  margin-top: 14px;
}

.learning-result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.example-view-btn {
  min-height: 36px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  background: #f8fafc;
  color: #075fa8;
  font-size: 12px;
}

.example-view-btn:hover {
  border-color: rgba(15, 111, 191, 0.48);
  background: #eef6ff;
}

.example-primary-btn:focus-visible,
.example-secondary-btn:focus-visible,
.example-view-btn:focus-visible,
.example-card-load:focus-visible,
.example-compact-card:focus-visible,
.example-icon-btn:focus-visible,
#btn-reset-example-filters:focus-visible,
.learning-card-toggle:focus-visible,
.learning-card-end:focus-visible,
.example-library-filters input:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

@media (max-width: 1100px) {
  .example-library-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .empty-model-guide {
    width: calc(100% - 24px);
    max-height: calc(100% - 24px);
    padding: 18px;
  }

  .empty-guide-cards {
    grid-template-columns: 1fr;
  }

  .example-compact-card {
    grid-template-columns: 112px 1fr;
    grid-template-rows: minmax(112px, auto);
    min-height: 112px;
  }

  .example-compact-preview {
    border-right: 1px solid var(--border);
    border-bottom: 0;
  }

  .example-library-overlay {
    padding: 24px 12px;
  }

  .example-library-dialog {
    width: 100%;
    height: min(78dvh, 620px);
    max-height: calc(100dvh - 48px);
    border: 1px solid rgba(169, 184, 202, 0.9);
    border-radius: 12px;
  }

  .example-library-header {
    padding: 16px;
  }

  .example-library-header h2 {
    font-size: 21px;
  }

  .example-library-filters {
    grid-template-columns: 1fr;
    padding: 12px 16px;
  }

  .example-library-filters input {
    font-size: 16px;
  }

  .example-library-result-row {
    padding: 0 16px 10px;
  }

  .example-library-grid {
    grid-template-columns: 1fr;
    padding: 0 16px 20px;
  }

  .example-learning-card {
    top: 12px;
    right: 12px;
    width: calc(100% - 24px);
    max-height: calc(100% - 24px);
    overflow: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .example-primary-btn,
  .example-secondary-btn,
  .example-view-btn,
  .example-card-load,
  .example-compact-card,
  .example-icon-btn,
  .example-card {
    transition: none;
  }
}

/* ---- AI 聊天面板 ---- */
#chat-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: var(--chat-drawer-width);
  max-width: 96vw;
  background: #ffffff;
  border-left: 1px solid var(--border);
  display: flex;
  transform: translateX(0);
  transition: transform 0.24s ease;
  overflow: visible;
  z-index: 30;
  box-shadow: -18px 0 42px rgba(36, 52, 71, 0.16);
}
#chat-panel.collapsed {
  transform: translateX(calc(100% + 2px));
  border-left: none;
}

#chat-drawer-handle {
  top: 50%;
  right: 0;
  width: 44px;
  min-height: 116px;
  padding: 12px 8px;
  border-right: 0;
  border-radius: 8px 0 0 8px;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  letter-spacing: 0;
}

#app:has(#chat-panel:not(.collapsed)) #node-props {
  right: calc(var(--chat-drawer-width) + 14px);
}

#chat-sidebar {
  width: 210px;
  flex: 0 0 210px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px;
  border-right: 1px solid var(--border);
  background: #f8fafc;
}

.chat-new-btn {
  width: 100%;
  min-height: 36px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: #ffffff;
  color: var(--text);
  font-weight: 800;
  cursor: pointer;
}

.chat-new-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.chat-clear-btn {
  min-height: 32px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.chat-clear-btn:hover {
  border-color: #fecaca;
  background: #fff7f7;
  color: #b91c1c;
}

#chat-history-list {
  display: flex;
  flex: 1;
  min-height: 0;
  flex-direction: column;
  gap: 6px;
  overflow-y: auto;
}

.chat-history-item {
  display: grid;
  gap: 3px;
  width: 100%;
  padding: 8px 9px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  text-align: left;
}

.chat-history-item:hover,
.chat-history-item.active {
  border-color: var(--border);
  background: #ffffff;
  color: var(--text);
}

.chat-history-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 13px;
  font-weight: 700;
}

.chat-history-meta {
  color: var(--muted);
  font-size: 11px;
}

#chat-main {
  display: flex;
  min-width: 0;
  flex: 1;
  flex-direction: column;
}

#chat-header {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#chat-header h3 {
  color: #0f172a;
  font-size: 15px;
}

#chat-current-title {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
}

.chat-header-actions {
  display: flex;
  gap: 6px;
}

#btn-close-chat,
#btn-delete-chat {
  min-height: 32px;
  padding: 5px 9px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #f8fafc;
  color: var(--muted);
  cursor: pointer;
}

#btn-delete-chat:hover {
  border-color: #fecaca;
  color: #b91c1c;
}

#btn-close-chat:hover {
  color: var(--text);
}

#chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.chat-msg {
  max-width: 90%;
  padding: 9px 12px;
  border-radius: 10px;
  font-size: 13px;
  line-height: 1.5;
  word-break: break-word;
}
.chat-msg.user {
  align-self: flex-end;
  background: var(--accent);
  color: #ffffff;
}
.chat-msg.assistant {
  align-self: flex-start;
  background: #f1f5f9;
  color: var(--text);
}

.chat-msg h3,
.chat-msg h4,
.chat-msg h5 {
  margin: 3px 0 6px;
  color: inherit;
}

.chat-msg h3 { font-size: 15px; }
.chat-msg h4 { font-size: 14px; }
.chat-msg h5 { font-size: 13px; }

.chat-list-item {
  display: block;
  padding-left: 4px;
}

.chat-msg pre {
  margin: 6px 0;
  padding: 7px 8px;
  overflow-x: auto;
  border-radius: 5px;
  background: rgba(15, 23, 42, 0.08);
  white-space: pre-wrap;
}

.chat-msg code {
  padding: 1px 3px;
  border-radius: 3px;
  background: rgba(15, 23, 42, 0.08);
  font-family: Consolas, monospace;
  font-size: 0.92em;
}

.chat-msg pre code {
  padding: 0;
  background: transparent;
}

.chat-msg mjx-container {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
}

.chat-msg.pending {
  color: var(--muted);
}

.chat-empty {
  display: grid;
  gap: 6px;
  margin: auto;
  max-width: 320px;
  color: var(--muted);
  text-align: center;
}

.chat-empty strong {
  color: var(--text);
  font-size: 16px;
}

.chat-model-status {
  display: inline-block;
  margin-top: 8px;
  color: var(--success);
  font-size: 12px;
  font-weight: 800;
}

.chat-model-status.pending {
  color: var(--primary);
}

.chat-model-status.cancelled {
  color: var(--muted);
}

.chat-model-status.invalid {
  color: var(--danger);
}

.chat-model-status.review {
  color: var(--warning);
}

.chat-model-summary {
  display: inline-block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
}

.chat-msg .model-btn {
  display: inline-block;
  margin-top: 6px;
  padding: 5px 10px;
  border: 1px solid var(--accent);
  border-radius: 5px;
  background: #ffffff;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}

.chat-msg .msg-action-btn {
  display: inline-block;
  margin-top: 6px;
  padding: 4px 8px;
  border: 1px solid transparent;
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.2);
  color: inherit;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}

#chat-input-row {
  display: flex;
  gap: 8px;
  padding: 10px;
  border-top: 1px solid var(--border);
}
#chat-input {
  flex: 1;
  min-height: 38px;
  padding: 7px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #ffffff;
  color: var(--text);
  font-size: 13px;
}
#chat-input:focus { border-color: var(--accent); outline: none; }
#chat-input:disabled {
  opacity: 0.65;
  cursor: wait;
}
#btn-chat-send {
  padding: 6px 14px;
  border-radius: 6px;
  border: none;
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
  cursor: pointer;
  font-size: 13px;
}
#btn-chat-send:hover { opacity: 0.85; }
#btn-chat-send:disabled {
  opacity: 0.85;
}

.chat-toggle {
  font-size: 13px;
}

@media (max-width: 1100px) {
  #chat-sidebar {
    width: 170px;
    flex-basis: 170px;
  }
}

@media (max-width: 760px) {
  #chat-panel {
    width: 100vw;
    max-width: none;
  }

  #result-drawer-handle {
    left: 50%;
  }

  #chat-sidebar {
    display: none;
  }

  #app:has(#chat-panel:not(.collapsed)) #node-props {
    right: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  #result-panel,
  #chat-panel {
    transition: none;
  }
}