:root {
  --bar: #1c262d;
  --bar-text: #f4f1ea;
  --accent: #2f6f5b;
  --accent-hover: #275c4b;
  --line: #cfd6dc;
  --bg: #e7ecef;
  --paper-shadow: 0 10px 30px rgba(28, 38, 45, 0.18);
  --editor: #f7f8f9;
  --text: #1c262d;
  --muted: #66717a;
  --danger: #8a3a32;
  --focus: #2f6f5b;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  color: var(--text);
  font: 14px/1.4 "Segoe UI", Calibri, sans-serif;
  background: var(--bg);
}

body.shell {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bar);
}

.shell-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding: 8px 12px;
  background: var(--bar);
  color: var(--bar-text);
  flex: 0 0 auto;
}

.shell-bar strong {
  font-size: 15px;
  letter-spacing: 0.02em;
}

.kind-picker {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #c5d0d6;
}

.kind-picker select {
  min-width: 260px;
  border-radius: 6px;
  border: 1px solid #3d4b55;
  padding: 5px 8px;
  background: #fff;
  color: var(--text);
}

#workspace {
  flex: 1 1 auto;
  min-height: 0;
  width: 100%;
  height: calc(100vh - 52px);
  border: 0;
  background: var(--bg);
}

html.embedded .app-switch,
body.embedded .app-switch {
  display: none;
}

html.embedded .brand strong,
body.embedded .brand strong {
  display: none;
}

.dialog-body textarea[readonly] {
  width: 100%;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px;
}

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

button {
  background: #fff;
  border: 1px solid #b7c0c7;
  border-radius: 6px;
  padding: 6px 10px;
  cursor: pointer;
  color: var(--text);
}

button:hover:not(:disabled) {
  background: #f3f6f7;
}

button:disabled {
  opacity: 0.45;
  cursor: default;
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

button.primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

button.ghost {
  background: transparent;
  border-color: transparent;
  color: inherit;
}

button.ghost:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.12);
}

.hidden { display: none !important; }

.app-bar {
  background: var(--bar);
  color: var(--bar-text);
  padding: 8px 12px 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-width: 0;
}

.brand strong {
  font-size: 15px;
  letter-spacing: 0.02em;
}

.app-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  font-size: 12px;
}

.app-switch a {
  color: #9aa7af;
  text-decoration: none;
}

.app-switch a:hover,
.app-switch a.current {
  color: #fff;
}

.app-switch a.current {
  font-weight: 650;
}

.file-status {
  color: #c5d0d6;
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-left: auto;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.toolbar-gap {
  width: 10px;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(420px, 44%) 1fr;
  height: calc(100vh - 84px);
}

.editor {
  background: var(--editor);
  border-right: 1px solid var(--line);
  padding: 14px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.field-grid {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 8px 10px;
  align-items: center;
}

.field-grid input,
.field-grid select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 8px;
  background: #fff;
}

.field-grid input:focus,
.field-grid select:focus,
.items-table input:focus,
textarea:focus {
  outline: 2px solid var(--focus);
  outline-offset: 0;
  border-color: var(--focus);
}

.items-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.items-label {
  font-weight: 650;
  margin-right: 4px;
}

.accidental-btns button {
  min-width: 34px;
  font-size: 16px;
  font-family: "Courier New", Courier, monospace;
}

.items-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  min-height: 180px;
}

.items-table {
  border-collapse: collapse;
  width: max-content;
  min-width: 100%;
}

.items-table th,
.items-table td {
  border-bottom: 1px solid #e4e8eb;
  padding: 4px;
  vertical-align: middle;
}

.items-table th {
  position: sticky;
  top: 0;
  background: #f0f3f5;
  font-size: 12px;
  font-weight: 650;
  text-align: center;
  z-index: 1;
}

.items-table .row-num {
  color: var(--muted);
  text-align: right;
  width: 28px;
  padding-left: 8px;
  font-variant-numeric: tabular-nums;
}

.items-table input {
  width: 4.4em;
  border: 1px solid #d5dce1;
  border-radius: 4px;
  padding: 4px 5px;
  text-align: center;
  font-family: "Courier New", Courier, monospace;
  font-size: 14px;
}

.items-table input.prompt {
  width: 4.8em;
  font-weight: 700;
}

.row-actions {
  white-space: nowrap;
  padding-right: 8px;
}

.row-actions button {
  padding: 2px 7px;
  min-width: 28px;
}

.preview-pane {
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: #d7dee3;
}

.preview-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding: 8px 12px;
  background: #eef2f4;
  border-bottom: 1px solid var(--line);
}

.tab {
  border-radius: 999px;
  padding: 5px 12px;
}

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

.preview-hint {
  margin-left: auto;
  color: var(--muted);
  font-size: 12px;
}

.paper-scroll {
  overflow: auto;
  padding: 18px;
  flex: 1;
}

.paper {
  width: 8.5in;
  height: 11in;
  margin: 0 auto 24px;
  padding: 0.5in;
  background: #fff;
  box-shadow: var(--paper-shadow);
  color: #000;
  zoom: 0.8;
}

.sheet {
  width: 100%;
  height: 100%;
}

.sheet.copies-4 {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr) minmax(0, 1fr);
  gap: 0.18in 0.28in;
}

.sheet.copies-2 {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr) minmax(0, 1fr);
  gap: 0.28in;
}

.sheet.copies-1 {
  display: block;
}

.quiz-copy {
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.sheet.copies-1 .quiz-copy {
  height: 100%;
}

.quiz-heading {
  font-family: "Courier New", Courier, monospace;
  font-size: 11.5px;
  line-height: 1.2;
  margin-bottom: 4px;
  flex: 0 0 auto;
}

.sheet.copies-2 .quiz-heading,
.sheet.copies-1 .quiz-heading {
  font-size: 16px;
  margin-bottom: 10px;
}

.quiz-heading .title {
  font-weight: 700;
}

.scale-grid {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  grid-template-columns: 1.18fr repeat(var(--extra-cols), 1fr);
  grid-template-rows: repeat(var(--rows), 1fr);
  border-top: 1.25px solid #000;
  border-left: 1.25px solid #000;
}

.cell {
  border-right: 1.25px solid #000;
  border-bottom: 1.25px solid #000;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Courier New", Courier, monospace;
  font-size: 12px;
  line-height: 1;
  overflow: hidden;
}

.sheet.copies-2 .cell { font-size: 18px; }
.sheet.copies-1 .cell { font-size: 22px; }

.cell.prompt {
  font-weight: 700;
}

body[data-print="student"] .cell.answer {
  color: transparent;
}

dialog {
  width: min(640px, 92vw);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0;
  color: var(--text);
}

dialog::backdrop {
  background: rgba(28, 38, 45, 0.45);
}

.dialog-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
}

.dialog-head h2 {
  margin: 0;
  font-size: 16px;
}

.dialog-body {
  padding: 14px;
}

.dialog-body ol {
  padding-left: 20px;
}

.dialog-body li { margin: 8px 0; }

.dialog-body textarea {
  width: 100%;
  font-family: "Courier New", Courier, monospace;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 10px;
}

@media (max-width: 1080px) {
  .workspace {
    grid-template-columns: 1fr;
    height: auto;
  }

  .editor {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    max-height: none;
  }

  .preview-pane {
    min-height: 80vh;
  }
}

@page {
  size: letter;
  margin: 0.5in;
}

@media print {
  html, body {
    background: #fff;
    height: auto;
  }

  .no-print { display: none !important; }

  .workspace,
  .preview-pane,
  .paper-scroll {
    display: block;
    overflow: visible;
    background: #fff;
    height: auto;
    padding: 0;
    margin: 0;
  }

  .paper {
    width: auto;
    height: auto;
    margin: 0;
    padding: 0;
    box-shadow: none;
    zoom: 1;
  }

  .sheet {
    height: 10in;
  }

  .sheet.copies-1,
  .sheet.copies-2,
  .sheet.copies-4 {
    height: 10in;
  }
}