:root {
  --pte-blue: #003459;
  --pte-blue-light: #0a5275;
  --pte-accent: #00a8cc;
  --pte-bg: #f4f6f8;
  --pte-panel: #ffffff;
  --pte-border: #d6dde2;
  --pte-text: #1c2733;
  --pte-muted: #6b7785;
  --pte-danger: #c0392b;
  --pte-good: #2e8b57;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--pte-bg);
  color: var(--pte-text);
  font-size: 15px;
  line-height: 1.5;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 24px;
  background: var(--pte-blue);
  color: white;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.brand {
  background: transparent;
  border: none;
  color: white;
  font: inherit;
  font-weight: 600;
  letter-spacing: 0.5px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: background 0.15s;
}
.brand:hover { background: rgba(255,255,255,0.1); }
.brand-mark {
  background: var(--pte-accent);
  color: white;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
}
.brand-text { font-weight: 500; opacity: 0.95; }

.btn-ghost.active {
  background: rgba(255,255,255,0.18);
  border-color: white;
}
.topbar-right { display: flex; gap: 16px; align-items: center; }
.task-label { color: #c9e4ee; font-size: 13px; }
.timer {
  font-family: "SF Mono", Menlo, monospace;
  background: rgba(255,255,255,0.1);
  padding: 4px 10px;
  border-radius: 4px;
  min-width: 70px;
  text-align: center;
}
.timer.warn { background: #c0392b; }

.btn-ghost {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.4);
  color: white;
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
}
.btn-ghost:hover { background: rgba(255,255,255,0.1); }

main {
  max-width: 960px;
  margin: 24px auto;
  padding: 0 16px;
}

.panel {
  background: var(--pte-panel);
  border: 1px solid var(--pte-border);
  border-radius: 6px;
  padding: 24px;
  margin-bottom: 16px;
}

h1, h2, h3 { color: var(--pte-blue); margin-top: 0; }
h1 { font-size: 24px; }
h2 { font-size: 20px; }
h3 { font-size: 16px; }

button.primary {
  background: var(--pte-accent);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
}
button.primary:hover { background: #0096b6; }
button.primary:disabled { background: #b0b8be; cursor: not-allowed; }

button.secondary {
  background: white;
  color: var(--pte-blue);
  border: 1px solid var(--pte-blue);
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
}
button.secondary:hover { background: #eef4f7; }

button.danger {
  background: var(--pte-danger);
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
}

.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }

/* Home / picker */
.home-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
}
.task-card {
  background: white;
  border: 1px solid var(--pte-border);
  border-left: 4px solid var(--pte-accent);
  border-radius: 4px;
  padding: 14px;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
}
.task-card:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.08);
}
.task-card .code {
  font-size: 11px;
  color: var(--pte-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.gen-btn {
  background: transparent;
  border: 1px solid var(--pte-border);
  border-radius: 4px;
  padding: 1px 6px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1;
  opacity: 0.6;
  transition: opacity 0.15s, background 0.15s;
}
.gen-btn:hover { opacity: 1; background: #eef8fb; border-color: var(--pte-accent); }
.gen-btn:disabled { opacity: 0.4; cursor: wait; }
.task-card .title { font-weight: 600; margin: 4px 0; }
.task-card .desc { font-size: 13px; color: var(--pte-muted); }

.section-heading {
  margin-top: 24px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--pte-muted);
  border-bottom: 1px solid var(--pte-border);
  padding-bottom: 4px;
}

/* Task UI */
.task-content {
  background: white;
  border: 1px solid var(--pte-border);
  border-radius: 6px;
  padding: 20px;
}
.passage {
  line-height: 1.7;
  white-space: pre-wrap;
  padding: 12px;
  background: #fafbfc;
  border-left: 3px solid var(--pte-accent);
  margin: 12px 0;
}

.instruction {
  background: #fff8dc;
  border: 1px solid #e8d77a;
  padding: 10px 14px;
  border-radius: 4px;
  margin-bottom: 16px;
  font-size: 14px;
}

textarea.essay {
  width: 100%;
  min-height: 200px;
  border: 1px solid var(--pte-border);
  border-radius: 4px;
  padding: 12px;
  font-family: inherit;
  font-size: 15px;
  line-height: 1.6;
  resize: vertical;
}

.word-count {
  text-align: right;
  font-size: 12px;
  color: var(--pte-muted);
  margin-top: 4px;
}

/* MCQ */
.mcq-option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px;
  border: 1px solid var(--pte-border);
  border-radius: 4px;
  margin-bottom: 6px;
  cursor: pointer;
  background: white;
}
.mcq-option:hover { background: #f4f8fa; }
.mcq-option.selected { background: #e0f0f6; border-color: var(--pte-accent); }
.mcq-option.correct { background: #d6f0d6; border-color: var(--pte-good); }
.mcq-option.incorrect { background: #f6d6d6; border-color: var(--pte-danger); }

/* Recorder */
.recorder {
  background: #f4f8fa;
  border: 1px solid var(--pte-border);
  border-radius: 6px;
  padding: 16px;
  margin: 12px 0;
}
.rec-indicator {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #b0b8be;
  margin-right: 8px;
  vertical-align: middle;
}
.rec-indicator.recording {
  background: var(--pte-danger);
  animation: pulse 1s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.audio-level {
  height: 6px;
  background: #d6dde2;
  border-radius: 3px;
  overflow: hidden;
  margin-top: 8px;
}
.audio-level-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--pte-good), #f7c844, var(--pte-danger));
  width: 0%;
  transition: width 0.05s;
}

/* Reorder paragraphs */
.reorder-list { list-style: none; padding: 0; }
.reorder-item {
  background: white;
  border: 1px solid var(--pte-border);
  padding: 10px;
  margin-bottom: 6px;
  border-radius: 4px;
  cursor: grab;
  user-select: none;
}
.reorder-item.dragging { opacity: 0.5; }

/* Fill in blanks */
.blank-dropdown {
  display: inline-block;
  margin: 0 4px;
  padding: 2px 6px;
  border: 1px solid var(--pte-blue);
  border-radius: 3px;
  background: white;
  min-width: 100px;
}
.blank-drop-target {
  display: inline-block;
  min-width: 120px;
  padding: 2px 6px;
  border: 2px dashed var(--pte-border);
  border-radius: 3px;
  margin: 0 4px;
  text-align: center;
  background: white;
  vertical-align: middle;
  min-height: 24px;
}
.blank-drop-target.over { border-color: var(--pte-accent); background: #eef8fb; }
.blank-drop-target.filled { border-style: solid; background: #e0f0f6; cursor: pointer; }

.word-bank {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px;
  background: #f4f8fa;
  border: 1px dashed var(--pte-border);
  border-radius: 4px;
  margin-top: 12px;
  min-height: 50px;
}
.word-chip {
  background: white;
  border: 1px solid var(--pte-blue);
  border-radius: 4px;
  padding: 4px 10px;
  cursor: grab;
  user-select: none;
  font-size: 14px;
}
.word-chip.dragging { opacity: 0.5; }

/* Highlight incorrect words */
.transcript-word {
  display: inline-block;
  padding: 1px 3px;
  margin: 1px 0;
  cursor: pointer;
  border-radius: 2px;
}
.transcript-word:hover { background: #fff8dc; }
.transcript-word.flagged { background: #f6d6d6; }
.transcript-word.actually-wrong { outline: 2px solid var(--pte-good); }

/* Audio player */
.audio-player {
  background: #f4f8fa;
  border: 1px solid var(--pte-border);
  border-radius: 4px;
  padding: 12px;
  margin: 12px 0;
}
.audio-player .progress {
  height: 6px;
  background: #d6dde2;
  border-radius: 3px;
  overflow: hidden;
  margin: 8px 0;
}
.audio-player .progress-bar {
  height: 100%;
  background: var(--pte-accent);
  width: 0%;
  transition: width 0.2s linear;
}

/* Score panel */
.score-panel {
  background: #eef8fb;
  border: 1px solid var(--pte-accent);
  border-radius: 6px;
  padding: 16px;
  margin-top: 16px;
}
.score-panel h3 { margin-top: 0; }
.score-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 8px;
  margin: 12px 0;
}
.score-item {
  background: white;
  padding: 10px;
  border-radius: 4px;
  text-align: center;
}
.score-item .num {
  font-size: 24px;
  font-weight: 600;
  color: var(--pte-blue);
}
.score-item .label {
  font-size: 11px;
  text-transform: uppercase;
  color: var(--pte-muted);
}

/* Settings dialog */
dialog {
  border: none;
  border-radius: 6px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
  padding: 0;
  max-width: 500px;
  width: 90%;
}
dialog::backdrop { background: rgba(0,0,0,0.4); }
.settings-form {
  padding: 24px;
}
.settings-form label {
  display: block;
  margin-bottom: 16px;
}
.settings-form label > span {
  display: block;
  font-size: 13px;
  margin-bottom: 4px;
  color: var(--pte-muted);
}
.settings-form input[type="password"],
.settings-form input[type="text"],
.settings-form select {
  width: 100%;
  padding: 8px;
  border: 1px solid var(--pte-border);
  border-radius: 4px;
  font-size: 14px;
}
.settings-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 16px;
}
.hint {
  font-size: 12px;
  color: var(--pte-muted);
  margin-top: 12px;
}

.loading {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid var(--pte-border);
  border-top-color: var(--pte-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}
@keyframes spin { to { transform: rotate(360deg); } }

.error {
  background: #fee;
  border: 1px solid var(--pte-danger);
  color: var(--pte-danger);
  padding: 10px;
  border-radius: 4px;
  margin: 12px 0;
}

.muted { color: var(--pte-muted); }
.small { font-size: 13px; }
.chart-svg { display: block; margin: 12px auto; max-width: 100%; }

.exam-progress {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
}
.exam-progress .step {
  flex: 1;
  height: 6px;
  background: var(--pte-border);
  border-radius: 3px;
}
.exam-progress .step.done { background: var(--pte-good); }
.exam-progress .step.current { background: var(--pte-accent); }

/* Manual scoring dialog */
#manual-scoring-dialog {
  max-width: 720px;
  width: 92%;
}
.manual-scoring {
  padding: 20px;
}
.manual-scoring h2 { margin-top: 0; }
.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  background: #eef8fb;
  border: 1px solid var(--pte-accent);
  border-radius: 4px;
  padding: 10px;
  margin-bottom: 16px;
  cursor: pointer;
}
.checkbox-row input { margin-top: 3px; }
.checkbox-row > span { display: block; }
.manual-step { margin-bottom: 16px; }
.manual-step-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}
.manual-prompt-box {
  background: #f4f8fa;
  border: 1px solid var(--pte-border);
  border-radius: 4px;
  padding: 12px;
  font-family: "SF Mono", Menlo, monospace;
  font-size: 12px;
  line-height: 1.5;
  max-height: 280px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
  margin: 0;
}
.manual-response-box {
  width: 100%;
  min-height: 140px;
  border: 1px solid var(--pte-border);
  border-radius: 4px;
  padding: 10px;
  font-family: "SF Mono", Menlo, monospace;
  font-size: 13px;
  resize: vertical;
}
.copy-flash {
  animation: copyFlash 0.6s ease;
}
@keyframes copyFlash {
  0% { background: var(--pte-good); color: white; }
  100% { background: white; color: var(--pte-blue); }
}
fieldset {
  border: 1px solid var(--pte-border);
  border-radius: 4px;
  padding: 12px;
  margin-bottom: 16px;
}
fieldset[disabled] {
  opacity: 0.5;
  pointer-events: none;
}

/* ---------- About / Docs view ---------- */
.docs {
  background: white;
  border-radius: 8px;
  padding: 0;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
.docs-hero {
  background: linear-gradient(135deg, var(--pte-blue) 0%, var(--pte-blue-light) 100%);
  color: white;
  padding: 40px 32px 32px;
}
.docs-hero h1 {
  color: white;
  font-size: 32px;
  margin: 0 0 8px 0;
  letter-spacing: -0.5px;
}
.docs-hero .tagline {
  font-size: 17px;
  color: #c9e4ee;
  margin: 0 0 20px 0;
  max-width: 600px;
}
.docs-hero .badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.badge {
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.2);
  color: white;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-family: "SF Mono", Menlo, monospace;
}
.docs-section {
  padding: 28px 32px;
  border-top: 1px solid var(--pte-border);
}
.docs-section:first-of-type { border-top: none; }
.docs-section h2 {
  font-size: 20px;
  margin: 0 0 12px;
  color: var(--pte-blue);
}
.docs-section h3 {
  font-size: 15px;
  margin: 20px 0 8px;
  color: var(--pte-text);
}
.docs-section p {
  line-height: 1.65;
  color: var(--pte-text);
  margin: 0 0 12px;
}
.docs-section ul {
  margin: 0 0 12px;
  padding-left: 22px;
  line-height: 1.7;
}
.docs-section li { margin-bottom: 4px; }
.docs-section code {
  background: #f4f8fa;
  border: 1px solid var(--pte-border);
  border-radius: 3px;
  padding: 1px 6px;
  font-family: "SF Mono", Menlo, monospace;
  font-size: 13px;
}
.docs-section pre {
  background: #1c2733;
  color: #e8eef3;
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.5;
  margin: 12px 0;
}
.docs-section pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin: 16px 0;
}
.feature-card {
  background: #f4f8fa;
  border-left: 3px solid var(--pte-accent);
  border-radius: 4px;
  padding: 12px 14px;
}
.feature-card .icon {
  font-size: 20px;
  margin-bottom: 4px;
}
.feature-card .ftitle {
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 4px;
  color: var(--pte-blue);
}
.feature-card .fdesc {
  font-size: 13px;
  color: var(--pte-muted);
  line-height: 1.5;
}
.stack-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0;
}
.stack-chip {
  background: white;
  border: 1px solid var(--pte-border);
  border-radius: 14px;
  padding: 4px 12px;
  font-size: 12px;
  font-family: "SF Mono", Menlo, monospace;
  color: var(--pte-text);
}
.stack-chip.api { border-color: var(--pte-accent); color: var(--pte-blue); background: #eef8fb; }
.arch-diagram {
  background: #f4f8fa;
  border: 1px solid var(--pte-border);
  border-radius: 6px;
  padding: 16px;
  font-family: "SF Mono", Menlo, monospace;
  font-size: 12px;
  line-height: 1.6;
  white-space: pre;
  overflow-x: auto;
  color: var(--pte-text);
}
.task-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin: 12px 0;
}
.task-table th, .task-table td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--pte-border);
}
.task-table th {
  background: #f4f8fa;
  font-weight: 600;
  color: var(--pte-blue);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.challenge {
  background: #fff8dc;
  border-left: 3px solid #e8d77a;
  border-radius: 4px;
  padding: 12px 16px;
  margin: 10px 0;
}
.challenge .ctitle {
  font-weight: 600;
  color: var(--pte-blue);
  margin-bottom: 4px;
}
.challenge .cbody {
  font-size: 13px;
  line-height: 1.55;
}
.docs-footer {
  background: #f4f8fa;
  padding: 20px 32px;
  border-top: 1px solid var(--pte-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--pte-muted);
  flex-wrap: wrap;
  gap: 12px;
}

/* Welcome dialog */
#welcome-dialog { max-width: 600px; width: 92%; }
.welcome { padding: 28px; }
.welcome h2 { margin-top: 0; font-size: 24px; }
.welcome-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 18px 0 12px;
}
.welcome-option {
  text-align: left;
  background: white;
  border: 2px solid var(--pte-border);
  border-radius: 6px;
  padding: 14px 16px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  font-family: inherit;
  width: 100%;
}
.welcome-option:hover {
  border-color: var(--pte-accent);
  background: #eef8fb;
}
.welcome-option .wo-title {
  font-weight: 600;
  font-size: 15px;
  color: var(--pte-blue);
  margin-bottom: 4px;
}
.welcome-option .wo-tag {
  font-size: 11px;
  background: var(--pte-good);
  color: white;
  padding: 1px 8px;
  border-radius: 10px;
  margin-left: 6px;
  font-weight: 500;
}
.welcome-option .wo-desc {
  font-size: 13px;
  color: var(--pte-muted);
  line-height: 1.5;
}

/* Personal footer */
.maker-footer {
  margin-top: 32px;
  padding: 24px;
  background: white;
  border: 1px solid var(--pte-border);
  border-radius: 8px;
  text-align: center;
  color: var(--pte-muted);
  font-size: 14px;
}
.maker-footer .credit {
  margin-bottom: 12px;
  color: var(--pte-text);
}
.maker-footer .credit strong { color: var(--pte-blue); }
.social-links {
  display: inline-flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}
.social-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: white;
  border: 1px solid var(--pte-border);
  border-radius: 20px;
  padding: 6px 14px;
  color: var(--pte-text);
  text-decoration: none;
  font-size: 13px;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
}
.social-link:hover {
  border-color: var(--pte-accent);
  background: #eef8fb;
  transform: translateY(-1px);
}
.social-link svg { width: 16px; height: 16px; }

/* Maker section inside About */
.maker-card {
  background: linear-gradient(135deg, #eef8fb 0%, #f4f8fa 100%);
  border-radius: 6px;
  padding: 20px;
  margin: 12px 0;
}
.maker-card .maker-name {
  font-weight: 600;
  color: var(--pte-blue);
  font-size: 16px;
  margin-bottom: 6px;
}
.maker-card .maker-bio {
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: 12px;
}
.maker-card .social-links { display: flex; justify-content: flex-start; }

/* Top back-row used by About and Progress */
.back-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 13px;
}
.back-link {
  background: transparent;
  border: 1px solid var(--pte-border);
  color: var(--pte-blue);
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  transition: background 0.15s, border-color 0.15s;
}
.back-link:hover {
  background: #eef8fb;
  border-color: var(--pte-accent);
}

/* Exit-task button in topbar */
#exit-task-btn {
  background: rgba(192, 57, 43, 0.2);
  border-color: rgba(255,255,255,0.4);
}
#exit-task-btn:hover { background: rgba(192, 57, 43, 0.4); }