:root {
  --bg: #101214;
  --panel: #17191d;
  --inset: #0b0d0f;
  --border: #2a2e35;
  --text: #e8e6e1;
  --text-muted: #9aa0a8;
  --text-dim: #5c626b;
  --accent: #ffb000;
  --phosphor: #4ade80;
  --correct: #4ade80;
  --incorrect: #ff6b57;
  --reveal: #7cc7ff;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", sans-serif;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.5;
}

.app {
  display: grid;
  grid-template-columns: 1fr;
  /* mobile order: trainer first, settings and stats below — opening
     settings must never push the Play button off screen */
  grid-template-areas:
    "header"
    "stage"
    "log"
    "sidebar"
    "stats";
  gap: 16px;
  padding: 16px;
  min-height: 100vh;
  max-width: 1100px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .app {
    grid-template-columns: 280px 1fr;
    grid-template-areas:
      "header header"
      "sidebar stage"
      "log log"
      "stats stats";
    gap: 24px;
    padding: 24px;
  }
}

/* skip link */

.skip-link {
  position: absolute;
  left: 8px;
  top: -56px;
  z-index: 10;
  padding: 10px 14px;
  border-radius: 6px;
  background: var(--accent);
  color: var(--inset);
  font-family: var(--mono);
  font-size: 13px;
  text-decoration: none;
}

.skip-link:focus {
  top: 8px;
}

/* header */

.app-header {
  grid-area: header;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
}

.app-header h1 {
  margin: 0;
  font-size: 20px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.app-header h1.brand {
  display: flex;
  align-items: center;
}

.brand-lockup {
  display: block;
  height: 30px;
  width: auto;
}

.config-chip {
  margin: 0;
  padding: 2px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--inset);
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.05em;
}

/* sidebar */

.sidebar {
  grid-area: sidebar;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px;
  align-self: start;
}

.sidebar-title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* mobile: settings collapse to a disclosure below the trainer stage */

.sidebar-toggle {
  display: block;
  width: 100%;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--inset);
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  text-align: left;
  cursor: pointer;
}

.sidebar-toggle::after {
  content: '▸';
  float: right;
}

.sidebar.sidebar--open .sidebar-toggle::after {
  content: '▾';
}

.sidebar-title {
  display: none;
}

.sidebar-panel {
  display: none;
  margin-top: 12px;
}

.sidebar.sidebar--open .sidebar-panel {
  display: block;
}

@media (min-width: 768px) {
  .sidebar-title {
    display: block;
  }

  .sidebar-toggle {
    display: none;
  }

  .sidebar-panel {
    display: block;
    margin-top: 0;
  }
}

.setting-group {
  display: grid;
  gap: 8px;
  margin: 0 0 14px;
  padding: 0;
  border: 0;
}

.setting-group[hidden] {
  display: none;
}

.setting-legend {
  padding: 0;
  color: var(--text-muted);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.segmented {
  display: flex;
}

.seg {
  position: relative;
  flex: 1;
}

.seg input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.seg span {
  display: block;
  padding: 6px 4px;
  border: 1px solid var(--border);
  background: var(--inset);
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-align: center;
  cursor: pointer;
}

.seg:first-child span {
  border-radius: 6px 0 0 6px;
}

.seg:last-child span {
  border-radius: 0 6px 6px 0;
}

.seg + .seg span {
  border-left: 0;
}

.seg input:checked + span {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--inset);
}

.seg input:focus-visible + span {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.seg input:disabled + span {
  opacity: 0.4;
  cursor: default;
}

.continent-select {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--inset);
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
}

.slider-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 8px;
  align-items: center;
}

.slider-row input[type='range'] {
  grid-column: 1 / -1;
  width: 100%;
  accent-color: var(--accent);
}

.readout {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--phosphor);
  text-align: right;
}

.sound-check {
  margin-top: 4px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--inset);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
}

.sound-check:hover {
  border-color: var(--phosphor);
  color: var(--phosphor);
}

/* stage */

.stage {
  grid-area: stage;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 32px 16px;
}

.on-air {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.25em;
}

.on-air[hidden] {
  display: none;
}

.on-air-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
}

@media (prefers-reduced-motion: no-preference) {
  .on-air-dot {
    animation: on-air-pulse 1.2s ease-in-out infinite;
  }
}

@keyframes on-air-pulse {
  50% {
    opacity: 0.25;
  }
}

/* scope trace: keying envelope of post-verdict replays */

.scope {
  display: block;
  width: min(100%, 420px);
  height: 84px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--inset);
}

.play-btn {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 10px 24px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  background: var(--inset);
  color: var(--accent);
  cursor: pointer;
}

.play-btn:hover {
  border-color: var(--phosphor);
  color: var(--phosphor);
}

.answer-label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.answer {
  width: min(100%, 22ch);
  font-family: var(--mono);
  font-size: 36px;
  letter-spacing: 0.15em;
  text-align: center;
  text-transform: uppercase;
  color: var(--phosphor);
  background: var(--inset);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
}

.answer:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (max-width: 480px) {
  .answer {
    font-size: 28px;
    letter-spacing: 0.1em;
  }
}

/* verdict + diff */

.verdict {
  min-height: 120px;
  width: 100%;
  text-align: center;
  color: var(--text-dim);
  font-size: 14px;
}

@media (prefers-reduced-motion: no-preference) {
  .verdict--enter {
    animation: verdict-fade 250ms ease both;
  }
}

@keyframes verdict-fade {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.verdict-line {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.verdict-icon {
  font-size: 18px;
}

.verdict--correct .verdict-line {
  color: var(--correct);
}

.verdict--incorrect .verdict-line {
  color: var(--incorrect);
}

.verdict--revealed .verdict-line {
  color: var(--reveal);
}

.verdict-call {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 24px;
  letter-spacing: 0.15em;
  color: var(--text);
}

.verdict-entity {
  margin: 8px 0 0;
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.diff {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 32px;
  letter-spacing: 0;
}

.diff-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  min-width: 1.2ch;
}

.diff-exp,
.diff-typed {
  line-height: 1.2;
}

.diff-exp {
  color: var(--text-dim);
}

.diff-typed {
  color: var(--text);
}

.diff-morse {
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  min-height: 1em;
}

.diff-cell--match .diff-exp {
  color: var(--correct);
  text-decoration: underline;
  text-underline-offset: 6px;
}

.diff-cell--match .diff-typed {
  color: var(--correct);
}

.diff-cell--mismatch .diff-exp {
  color: var(--correct);
}

.diff-cell--mismatch .diff-typed {
  color: var(--incorrect);
  text-decoration: line-through;
}

.diff-cell--missing .diff-exp {
  color: var(--correct);
}

.diff-cell--missing .diff-typed {
  color: var(--incorrect);
}

.diff-cell--extra .diff-typed {
  color: var(--incorrect);
  text-decoration: line-through;
}

/* stats bar */

.stats-bar {
  grid-area: stats;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 16px;
}

.stat {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.stat-label {
  color: var(--text-muted);
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.stat-value {
  font-family: var(--mono);
  font-size: 18px;
  color: var(--phosphor);
}

.stats-more {
  display: none;
  align-self: center;
  min-height: 44px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--inset);
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
}

/* mobile: attempts/accuracy/streak stay, the rest behind a disclosure */

.stat-extra {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
}

@media (max-width: 767px) {
  .stats-more {
    display: block;
  }

  .stat-extra {
    display: none;
    width: 100%;
  }

  .stats-bar.stats-bar--open .stat-extra {
    display: flex;
  }
}

/* copied this session */

.copy-log {
  grid-area: log;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 16px;
}

.copy-log-title {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.copy-log-scroll {
  overflow-x: auto;
}

.copy-log-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.copy-log-table[hidden] {
  display: none;
}

.copy-log-table th {
  padding: 4px 8px;
  border-bottom: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-align: left;
  white-space: nowrap;
}

.copy-log-table th:last-child {
  text-align: right;
}

.copy-log-table td {
  padding: 4px 8px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  vertical-align: baseline;
}

.copy-log-table tr:last-child td {
  border-bottom: 0;
}

.copy-log-call {
  font-family: var(--mono);
  letter-spacing: 0.08em;
  color: var(--phosphor);
  white-space: nowrap;
}

.copy-log-flag {
  font-size: 16px;
}

.copy-log-replays {
  font-family: var(--mono);
  text-align: right;
}

.copy-log-empty {
  margin: 0;
  color: var(--text-dim);
  font-size: 13px;
}

.copy-log-empty[hidden] {
  display: none;
}

/* shared */

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* touch targets */

@media (max-width: 767px) {
  .play-btn,
  .end-session,
  .sound-check,
  .summary-btn,
  .sidebar-toggle,
  .stats-more,
  .continent-select,
  .answer,
  .slider-row input[type='range'] {
    min-height: 44px;
  }

  .seg span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
  }

  .stat {
    min-height: 44px;
    align-items: center;
  }
}

button:disabled {
  opacity: 0.55;
  cursor: default;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* header actions */

.end-session {
  margin-left: auto;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--inset);
  color: var(--text);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
}

.end-session:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.last-chip {
  margin: 0;
  padding: 2px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--inset);
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.05em;
}

.last-chip[hidden] {
  display: none;
}

.wpm-ladder {
  margin: 0;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.05em;
}

/* session summary */

.summary {
  display: grid;
  gap: 10px;
  width: 100%;
  max-width: 420px;
  margin: 8px auto;
  padding: 20px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.summary[hidden] {
  display: none;
}

.summary--fade {
  animation: summary-fade 400ms ease both;
}

@keyframes summary-fade {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .summary--fade {
    animation: none;
  }
}

.summary-title {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
}

.summary-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin: 0;
}

.summary-label {
  color: var(--text-muted);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.summary-value {
  font-family: var(--mono);
  font-size: 16px;
  color: var(--phosphor);
}

.sparkline {
  width: 100%;
  height: 28px;
  color: var(--phosphor);
}

.sparkline polyline {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
}

.sparkline circle {
  fill: currentColor;
}

.summary-actions {
  display: flex;
  gap: 8px;
  margin-top: 4px;
}

.summary-btn {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--inset);
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  cursor: pointer;
}

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

.summary-btn--primary {
  border-color: var(--accent);
  color: var(--accent);
}

/* site footer */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 16px;
  text-align: center;
}

.site-footer p {
  margin: 0;
  color: var(--text-dim);
  font-size: 12px;
  letter-spacing: 0.05em;
}

.site-footer a {
  color: var(--text-muted);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--accent);
}