:root {
  --ink: #18232c;
  --muted: #5b6770;
  --paper: #ffffff;
  --surface: #f3f5f6;
  --line: #cbd4d9;
  --line-dark: #8f9da6;
  --navy: #24384a;
  --teal: #0d6472;
  --green: #2f7655;
  --gold: #bd7c19;
  --red: #b5443a;
  --blue: #145db2;
  --focus: #195fb8;
  --shadow: 0 16px 40px rgba(24, 35, 44, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--surface);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 18px;
  line-height: 1.5;
}

body {
  margin: 0;
  min-height: 100vh;
}

[hidden] {
  display: none !important;
}

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

button,
input,
select,
textarea,
a {
  border-radius: 6px;
}

:focus-visible {
  outline: 4px solid var(--focus);
  outline-offset: 3px;
}

.skip-link {
  background: var(--ink);
  color: #ffffff;
  left: 1rem;
  padding: 0.65rem 0.9rem;
  position: absolute;
  top: 1rem;
  transform: translateY(-160%);
  z-index: 10;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  background: #ffffff;
  border-bottom: 3px solid var(--navy);
}

.header-inner {
  align-items: center;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1260px;
  padding: 1rem 1.25rem;
}

.eyebrow {
  color: var(--navy);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  margin: 0 0 0.25rem;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

h1 {
  font-size: 1.75rem;
  line-height: 1.15;
}

h2 {
  font-size: 1.45rem;
  line-height: 1.2;
}

h3 {
  font-size: 1.12rem;
  line-height: 1.25;
}

h4 {
  font-size: 1rem;
}

.header-copy,
.hint,
.optional {
  color: var(--muted);
}

.privacy-note {
  border: 1px solid var(--line);
  color: var(--navy);
  padding: 0.55rem 0.75rem;
}

.app-shell {
  margin: 0 auto;
  max-width: 1260px;
  padding: 1.25rem;
}

.view {
  display: none;
}

.view.is-active {
  display: block;
}

.assessment-card,
.status-panel,
.assessment-topbar,
.assessment-panel,
.task-nav,
.question-card,
.tutor-panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.assessment-card,
.status-panel,
.assessment-panel,
.task-nav,
.question-card,
.tutor-panel {
  padding: 1.25rem;
}

.status-panel,
.tutor-panel {
  margin-top: 1rem;
}

.section-heading {
  display: grid;
  gap: 0.45rem;
  margin-bottom: 1rem;
}

.section-heading.compact {
  margin-bottom: 0.75rem;
}

.setup-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(260px, 1fr) minmax(260px, 1fr);
}

.practice-options {
  display: contents;
}

.form-field,
.form-stack {
  display: grid;
  gap: 0.45rem;
}

label,
legend {
  font-weight: 700;
}

input[type="text"],
input[type="email"],
input[type="number"],
select,
textarea {
  background: #ffffff;
  border: 2px solid var(--line-dark);
  color: var(--ink);
  min-height: 48px;
  padding: 0.65rem 0.75rem;
  width: 100%;
}

textarea {
  min-height: 160px;
  resize: vertical;
}

.choice-group {
  border: 2px solid #d8e0e4;
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 0.9rem;
}

.choice-tile,
.answer-option,
.check-row,
.search-result,
.video-control,
.editable-line {
  align-items: flex-start;
  background: #f9fbfb;
  border: 1px solid #d7e0e3;
  display: flex;
  gap: 0.65rem;
  padding: 0.8rem;
}

.choice-tile input,
.answer-option input,
.check-row input,
.search-result input,
.video-control input,
.editable-line input {
  flex: 0 0 auto;
  height: 1.1rem;
  margin-top: 0.25rem;
  width: 1.1rem;
}

.button-row,
.question-controls,
.tutor-actions,
.test-actions {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.button-row {
  grid-column: 1 / -1;
  margin-top: 0.25rem;
}

button {
  border: 2px solid transparent;
  cursor: pointer;
  font-weight: 700;
  min-height: 48px;
  padding: 0.65rem 1rem;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.primary-button {
  background: var(--teal);
  color: #ffffff;
}

.primary-button:hover {
  background: #094b55;
}

.secondary-button {
  background: #ffffff;
  border-color: var(--line-dark);
  color: var(--ink);
}

.secondary-button:hover,
.tab-button:hover,
.nav-pill:hover {
  border-color: var(--teal);
}

.danger,
.danger-fill {
  border-color: #d6a5a0;
  color: var(--red);
}

.danger-fill {
  background: var(--red);
  color: #ffffff;
}

.text-button {
  background: transparent;
  color: var(--navy);
  min-height: auto;
  padding: 0.3rem 0;
  text-decoration: underline;
}

.assessment-topbar {
  align-items: center;
  display: flex;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding: 1rem;
}

.timer-box {
  border: 1px solid var(--line-dark);
  display: grid;
  gap: 0.15rem;
  min-width: 115px;
  padding: 0.55rem 0.75rem;
  text-align: center;
}

.timer-label {
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
}

#timerDisplay {
  font-weight: 700;
}

.assessment-layout {
  align-items: start;
  display: grid;
  gap: 1rem;
  grid-template-columns: 245px minmax(0, 1fr);
}

.task-nav {
  position: sticky;
  top: 1rem;
}

.navigator-list {
  display: grid;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.nav-pill {
  background: #ffffff;
  border: 2px solid var(--line);
  color: var(--ink);
  display: grid;
  gap: 0.1rem;
  min-height: auto;
  padding: 0.55rem;
  text-align: left;
}

.nav-pill.active {
  border-color: var(--teal);
  box-shadow: inset 4px 0 0 var(--teal);
}

.nav-pill.flagged {
  border-color: var(--gold);
}

.nav-pill small {
  color: var(--muted);
  font-weight: 400;
}

.paper-question {
  display: grid;
  gap: 1rem;
}

.paper-meta,
.question-meta {
  align-items: center;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  font-weight: 700;
  gap: 0.65rem;
  justify-content: space-between;
}

.answer-stack,
.instruction-list,
.progress-summary,
.results-grid,
.review-grid,
.search-results,
.line-editor,
.mark-breakdown {
  display: grid;
  gap: 0.85rem;
}

.instruction-list ul {
  margin-top: 0.5rem;
}

.question-controls {
  border-top: 1px solid var(--line);
  justify-content: space-between;
  margin-top: 1.25rem;
  padding-top: 1rem;
}

.workspace-shell {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(250px, 0.9fr) minmax(420px, 1.6fr);
}

.instruction-panel {
  background: #f6f8f9;
  border: 1px solid var(--line);
  padding: 1rem;
}

.instruction-panel ol {
  margin-bottom: 0;
  padding-left: 1.25rem;
}

.workspace-panel {
  border: 1px solid var(--line);
  min-width: 0;
}

.workspace-tabs {
  background: #eef2f4;
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding: 0.5rem;
}

.tab-button {
  background: #ffffff;
  border: 2px solid var(--line);
  color: var(--ink);
  min-height: 42px;
  padding: 0.45rem 0.7rem;
}

.tab-button.active {
  background: var(--navy);
  border-color: var(--navy);
  color: #ffffff;
}

.workspace-tool {
  display: grid;
  gap: 1rem;
  padding: 1rem;
}

.tool-grid {
  display: grid;
  gap: 0.85rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.file-tree,
.slide-preview,
.result-box,
.stat-item,
.mark-item {
  border: 1px solid var(--line);
  padding: 0.9rem;
}

.tree-folder {
  border-left: 4px solid var(--navy);
  margin-top: 0.75rem;
  padding-left: 0.75rem;
}

.notice {
  background: #fff7e8;
  border-left: 6px solid var(--gold);
  padding: 0.85rem 1rem;
}

.editor-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.editable-line {
  align-items: center;
}

.slide-preview {
  aspect-ratio: 16 / 9;
  background: #ffffff;
  min-height: 260px;
  overflow: hidden;
  position: relative;
}

.slide-preview pre {
  font-family: Arial, Helvetica, sans-serif;
  white-space: pre-wrap;
}

.mock-image {
  align-items: center;
  background: #d9e8f7;
  border: 2px solid var(--blue);
  color: #0d376d;
  display: flex;
  font-weight: 700;
  height: 92px;
  justify-content: center;
  position: absolute;
  text-align: center;
  width: 130px;
}

.mock-image.top-left {
  left: 1rem;
  top: 1rem;
}

.mock-image.top-right {
  right: 1rem;
  top: 1rem;
}

.mock-image.bottom-left {
  bottom: 1rem;
  left: 1rem;
}

.mock-image.bottom-right {
  bottom: 1rem;
  right: 1rem;
}

.video-controls {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
}

.pill {
  background: #e9f1f7;
  border: 1px solid #bfd0df;
  color: var(--navy);
  display: inline-flex;
  font-size: 0.88rem;
  font-weight: 700;
  padding: 0.25rem 0.55rem;
}

.pill.warn {
  background: #fff4df;
  border-color: #e0bd7a;
  color: #6a4608;
}

.scenario {
  background: #eef7f2;
  border-left: 6px solid var(--green);
  padding: 0.85rem 1rem;
}

.order-row,
.match-row {
  align-items: center;
  background: #f9fbfb;
  border: 1px solid var(--line);
  display: grid;
  gap: 0.75rem;
  grid-template-columns: minmax(180px, 1fr) minmax(180px, 1fr);
  padding: 0.8rem;
}

.breakdown-table {
  border-collapse: collapse;
  width: 100%;
}

.breakdown-table th,
.breakdown-table td {
  border-bottom: 1px solid var(--line);
  padding: 0.65rem;
  text-align: left;
}

.breakdown-table th {
  background: #eef2f4;
}

.result-hero strong {
  display: block;
  font-size: 2rem;
}

.revision-list {
  margin: 0;
  padding-left: 1.25rem;
}

.tutor-actions {
  align-items: stretch;
}

.tutor-output {
  display: grid;
  gap: 0.85rem;
  margin-top: 1rem;
}

.site-footer {
  color: var(--muted);
  margin: 0 auto;
  max-width: 1260px;
  padding: 1rem 1.25rem 2rem;
}

.print-area {
  display: none;
}

@media (max-width: 980px) {
  .assessment-layout,
  .workspace-shell {
    grid-template-columns: 1fr;
  }

  .task-nav {
    position: static;
  }

  .navigator-list {
    grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
  }
}

@media (max-width: 760px) {
  html {
    font-size: 17px;
  }

  .header-inner,
  .assessment-topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .setup-grid {
    grid-template-columns: 1fr;
  }

  .question-controls button,
  .button-row button,
  .tutor-actions button {
    width: 100%;
  }

  .order-row,
  .match-row {
    grid-template-columns: 1fr;
  }
}

@media print {
  body {
    background: #ffffff;
  }

  .site-header,
  .app-shell,
  .site-footer,
  .skip-link {
    display: none !important;
  }

  .print-area {
    color: #000000;
    display: block;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 12pt;
    line-height: 1.35;
    padding: 0;
  }

  .print-question {
    border-top: 1px solid #888888;
    margin-top: 12pt;
    padding-top: 10pt;
    page-break-inside: avoid;
  }
}