:root {
  --paper: #f3efe6;
  --paper-strong: #e8e1d2;
  --surface: #fffdf8;
  --surface-soft: #f8f4ea;
  --surface-mist: #eef2eb;
  --ink: #21342d;
  --muted: #66776d;
  --accent: #0f766e;
  --accent-strong: #0b5a54;
  --accent-soft: #dbeee9;
  --clay: #c96c3a;
  --clay-soft: #f4dfd3;
  --green: #2d7d46;
  --red: #be5a3d;
  --border: #d7ddd1;
  --border-strong: #c7d0c2;
  --radius: 22px;
  --radius-sm: 14px;
  --shadow: 0 18px 40px rgba(33, 52, 45, 0.08);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  color: var(--ink);
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(15, 118, 110, 0.10), transparent 30%),
    radial-gradient(circle at top right, rgba(201, 108, 58, 0.10), transparent 24%),
    linear-gradient(180deg, #f7f3ea 0%, var(--paper) 100%);
}

body.overlay-open {
  overflow: hidden;
}

a {
  color: inherit;
}

.page-shell {
  width: min(1180px, calc(100vw - 40px));
  margin: 0 auto 48px;
}

.site-header {
  width: min(1180px, calc(100vw - 40px));
  margin: 0 auto;
  padding: 26px 0 18px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 20px;
}

.site-header h1 {
  margin: 4px 0 0;
  font-size: 2rem;
  letter-spacing: -0.04em;
}

.site-header nav {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.site-header nav a {
  text-decoration: none;
  color: var(--muted);
  padding: 10px 14px;
  border-radius: 999px;
  transition: background 0.2s ease, color 0.2s ease;
}

.site-header nav a:hover,
.site-header nav a.active {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.65);
}

.eyebrow {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
}

.hero-card,
.panel {
  background: rgba(255, 253, 248, 0.9);
  border: 1px solid rgba(199, 208, 194, 0.85);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.hero-card {
  padding: 28px;
  display: grid;
  gap: 24px;
}

.practice-hero,
.dashboard-hero {
  grid-template-columns: 1.1fr 0.9fr;
  align-items: start;
}

.hero-copy h2,
.section-head h3,
.session-results h2 {
  margin: 8px 0 0;
  font-size: clamp(1.6rem, 2.5vw, 2.4rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.section-head h3,
.session-results h2 {
  font-size: 1.35rem;
}

.hero-text,
.source-note,
.dynamics-header p,
.dynamics-metric-note,
.dynamics-highlight-note,
.dynamics-insight,
.lesson-engine-card p {
  color: var(--muted);
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 16px;
  margin-top: 18px;
}

.status-note {
  margin: 0;
}

.stats-bar,
.hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.stat-card {
  padding: 18px;
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.85), rgba(248, 244, 234, 0.95));
  border: 1px solid var(--border);
}

.stat-label,
.section-mini {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  font-weight: 700;
}

.stat-value {
  margin-top: 10px;
  font-size: clamp(1.5rem, 2vw, 2.1rem);
  font-weight: 800;
  letter-spacing: -0.05em;
}

.panel {
  padding: 24px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: start;
  margin-bottom: 18px;
}

.section-head-inline {
  align-items: center;
}

.section-head h3 {
  margin-top: 6px;
}

.controls {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 22px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: rgba(255, 255, 255, 0.82);
  color: var(--ink);
  font: inherit;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.16s ease, background 0.16s ease, border-color 0.16s ease;
}

.btn:hover {
  transform: translateY(-1px);
  background: white;
}

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

.btn.primary:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.btn.danger {
  color: white;
  background: var(--red);
  border-color: var(--red);
}

.btn.danger:hover {
  background: #a64d34;
  border-color: #a64d34;
}

.btn:disabled {
  cursor: wait;
  opacity: 0.7;
  transform: none;
}

.lesson-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.lesson-badge {
  min-width: 100px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg, var(--accent-soft), rgba(255, 255, 255, 0.75));
  border: 1px solid rgba(15, 118, 110, 0.18);
}

.lesson-badge span {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.lesson-badge strong {
  display: block;
  margin-top: 8px;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.prompt-area {
  min-height: 160px;
  padding: 28px;
  border-radius: calc(var(--radius) - 4px);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(248, 244, 234, 0.92)),
    repeating-linear-gradient(180deg, transparent, transparent 34px, rgba(33, 52, 45, 0.04) 34px, rgba(33, 52, 45, 0.04) 35px);
  border: 1px solid var(--border);
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  line-height: 1.85;
  letter-spacing: 0.02em;
}

.loading-text {
  color: var(--muted);
}

.prompt-area .char {
  transition: color 0.12s ease, background 0.12s ease;
}

.prompt-area .char.correct {
  color: var(--green);
}

.prompt-area .char.incorrect {
  color: var(--red);
  text-decoration: underline;
  text-decoration-thickness: 2px;
}

.prompt-area .char.current {
  background: rgba(15, 118, 110, 0.14);
  color: var(--accent-strong);
  border-radius: 4px;
  box-shadow: inset 0 -1px 0 rgba(15, 118, 110, 0.2);
}

.prompt-area .char.pending {
  color: rgba(102, 119, 109, 0.8);
}

.lesson-grid,
.lesson-engine-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.lesson-block,
.lesson-engine-card,
.session-summary-card,
.dynamics-metric,
.dynamics-highlight,
.dynamics-section {
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.85), rgba(248, 244, 234, 0.95));
}

.lesson-block,
.lesson-engine-card,
.session-summary-card,
.dynamics-metric,
.dynamics-highlight,
.dynamics-section {
  padding: 16px;
}

.chip-row,
.dynamics-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.letter-chip,
.dynamics-chip {
  padding: 8px 10px;
  border-radius: 999px;
  background: rgba(15, 118, 110, 0.08);
  border: 1px solid rgba(15, 118, 110, 0.16);
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
  font-size: 0.86rem;
  color: var(--accent-strong);
}

.letter-chip.muted,
.dynamics-chip.bad {
  background: rgba(201, 108, 58, 0.08);
  border-color: rgba(201, 108, 58, 0.2);
  color: var(--clay);
}

.keyboard-panel {
  margin-top: 18px;
}

.keyboard {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
}

.keyboard-row {
  display: flex;
  gap: 6px;
}

.key {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.86rem;
  box-shadow: inset 0 -2px 0 rgba(33, 52, 45, 0.04);
  transition: transform 0.1s ease, background 0.1s ease, border-color 0.1s ease;
  user-select: none;
}

.key.space {
  width: 300px;
}

.key.wide {
  width: 74px;
}

.key.wider {
  width: 96px;
}

.key.lesson-focus {
  background: var(--accent-soft);
  border-color: rgba(15, 118, 110, 0.35);
  color: var(--accent-strong);
}

.key.lesson-support {
  background: rgba(201, 108, 58, 0.10);
  border-color: rgba(201, 108, 58, 0.22);
  color: var(--clay);
}

.key.active {
  transform: translateY(1px) scale(0.98);
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.key.correct-flash {
  background: var(--green);
  border-color: var(--green);
  color: white;
}

.key.incorrect-flash {
  background: var(--red);
  border-color: var(--red);
  color: white;
}

.session-complete {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(32, 51, 44, 0.46);
  backdrop-filter: blur(10px);
  z-index: 100;
}

.session-complete.visible {
  display: flex;
}

.session-results {
  width: min(980px, 100%);
  padding: 32px;
  border-radius: calc(var(--radius) + 4px);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: 0 28px 60px rgba(33, 52, 45, 0.16);
}

.session-results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.results-close {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.85);
  color: var(--muted);
  font: inherit;
  padding: 9px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.results-close:hover,
.results-close:focus-visible {
  background: white;
  border-color: var(--border-strong);
  color: var(--ink);
}

.session-results-layout {
  display: grid;
  grid-template-columns: minmax(220px, 260px) 1fr;
  gap: 18px;
  margin-top: 18px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(199, 208, 194, 0.6);
}

.result-label {
  color: var(--muted);
}

.result-value {
  font-weight: 700;
}

.session-actions {
  justify-content: flex-end;
}

.dashboard-grid {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.panel-large,
.full-width {
  grid-column: 1 / -1;
}

.panel canvas {
  width: 100%;
  height: 280px;
}

#session-map-chart,
#timeline-chart {
  height: 320px;
}

.distribution-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.distribution-card {
  padding: 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.82), rgba(248, 244, 234, 0.96));
}

.distribution-card canvas {
  height: 180px;
  margin-top: 8px;
}

.segmented {
  display: inline-flex;
  padding: 4px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid var(--border);
}

.segmented button {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
}

.segmented button.active {
  background: var(--accent);
  color: white;
}

.viz-caption,
.viz-statline {
  color: var(--muted);
  line-height: 1.55;
}

.viz-caption {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid rgba(199, 208, 194, 0.65);
  font-size: 0.92rem;
}

.viz-statline {
  margin-top: 8px;
  font-size: 0.82rem;
}

.analysis-keyboard {
  display: grid;
  gap: 18px;
}

.keyboard-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 16px;
  align-items: center;
}

.keyboard-legend-note {
  color: var(--muted);
  font-size: 0.86rem;
}

.legend-scale {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 0.86rem;
}

.legend-bar {
  width: 120px;
  height: 10px;
  border-radius: 999px;
  border: 1px solid rgba(199, 208, 194, 0.8);
}

.legend-bar.teal {
  background: linear-gradient(90deg, rgba(15, 118, 110, 0.08), rgba(15, 118, 110, 0.66));
}

.legend-bar.clay {
  background: linear-gradient(90deg, rgba(201, 108, 58, 0.08), rgba(201, 108, 58, 0.66));
}

.analysis-keyboard-shell {
  overflow-x: auto;
  padding-bottom: 6px;
}

.analysis-keyboard-board {
  display: grid;
  gap: 10px;
  min-width: 980px;
  padding: 18px;
  border-radius: calc(var(--radius-sm) + 4px);
  border: 1px solid rgba(199, 208, 194, 0.78);
  background: linear-gradient(180deg, rgba(248, 244, 234, 0.92), rgba(236, 241, 234, 0.86));
}

.analysis-keyboard-row {
  display: flex;
  gap: 8px;
  justify-content: center;
}

.keyboard-row-2 {
  padding-left: 20px;
}

.keyboard-row-3 {
  padding-left: 30px;
}

.keyboard-row-4 {
  padding-left: 48px;
}

.keyboard-row-5 {
  padding-left: 62px;
}

.analysis-keycap {
  min-height: 74px;
  padding: 10px 10px 8px;
  border-radius: 14px;
  border: 1px solid rgba(199, 208, 194, 0.85);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 8px;
  box-shadow: inset 0 -2px 0 rgba(33, 52, 45, 0.04);
}

.analysis-keycap.width-unit {
  width: 52px;
}

.analysis-keycap.width-wide {
  width: 78px;
}

.analysis-keycap.width-wider {
  width: 96px;
}

.analysis-keycap.width-xwide {
  width: 116px;
}

.analysis-keycap.width-space {
  width: 316px;
}

.analysis-keycap.focus {
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.16), inset 0 -2px 0 rgba(33, 52, 45, 0.04);
  border-color: rgba(15, 118, 110, 0.32);
}

.analysis-keycap.weak {
  border-color: rgba(201, 108, 58, 0.34);
}

.analysis-keycap.missing.letter {
  color: var(--muted);
}

.analysis-keycap.modifier,
.analysis-keycap.passive {
  color: var(--muted);
}

.analysis-keycap-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 6px;
}

.analysis-keycap-label {
  font-weight: 800;
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.analysis-keycap-count {
  color: inherit;
  opacity: 0.72;
  font-size: 0.66rem;
}

.analysis-keycap-metric {
  min-height: 1.1em;
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
  font-size: 0.76rem;
  line-height: 1.2;
}

.analysis-keycap-note {
  min-height: 1em;
  color: var(--muted);
  font-size: 0.66rem;
}

.analysis-keycap.modifier .analysis-keycap-count,
.analysis-keycap.modifier .analysis-keycap-metric,
.analysis-keycap.modifier .analysis-keycap-note,
.analysis-keycap.passive .analysis-keycap-count,
.analysis-keycap.passive .analysis-keycap-metric,
.analysis-keycap.passive .analysis-keycap-note {
  visibility: hidden;
}

.keyboard-readout {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.keyboard-readout-card {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(248, 244, 234, 0.95));
}

.keyboard-readout-card.focus {
  border-color: rgba(15, 118, 110, 0.24);
}

.keyboard-readout-card.weak {
  border-color: rgba(201, 108, 58, 0.24);
}

.keyboard-readout-card.strong {
  border-color: rgba(45, 125, 70, 0.22);
}

.keyboard-readout-value {
  margin-top: 10px;
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.keyboard-readout-note {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.5;
}

.leaderboard-split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.leaderboard {
  display: grid;
  gap: 12px;
  margin-top: 12px;
}

.leader-row {
  padding: 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.85), rgba(248, 244, 234, 0.94));
}

.leader-row-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 10px;
}

.leader-bar {
  height: 8px;
  border-radius: 999px;
  background: rgba(15, 118, 110, 0.08);
  overflow: hidden;
}

.leader-bar-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), #24a79c);
}

.leader-note {
  margin-top: 8px;
  font-size: 0.82rem;
  color: var(--muted);
}

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

.dp-table th,
.dp-table td {
  padding: 10px 8px;
  text-align: left;
  border-bottom: 1px solid rgba(199, 208, 194, 0.7);
}

.dp-table th {
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.lesson-engine-grid,
.dynamics-metrics,
.dynamics-highlights,
.dynamics-sections {
  display: grid;
  gap: 14px;
}

.dynamics-metrics,
.dynamics-highlights {
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.lesson-engine-card {
  min-height: 100%;
}

.engine-value,
.dynamics-metric-value,
.dynamics-highlight-value {
  margin-top: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.dynamics-view {
  display: grid;
  gap: 14px;
}

.dynamics-header h3 {
  margin: 0;
  font-size: 1.2rem;
}

.dynamics-metric-label,
.dynamics-highlight-label,
.dynamics-section-title {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  font-weight: 700;
}

.dynamics-section {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(248, 244, 234, 0.95));
}

.dynamics-insights {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.dynamics-insight {
  padding: 10px 12px;
  border-left: 3px solid var(--accent);
  border-radius: 0 10px 10px 0;
  background: rgba(15, 118, 110, 0.06);
}

.dynamics-empty {
  padding: 16px;
  border-radius: 14px;
  border: 1px dashed var(--border-strong);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.58);
}

.budget-wrap {
  margin-top: 18px;
}

.budget-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.budget-bar {
  margin-top: 10px;
  width: 100%;
  height: 12px;
  border-radius: 999px;
  background: rgba(15, 118, 110, 0.08);
  overflow: hidden;
  border: 1px solid rgba(199, 208, 194, 0.7);
}

.budget-bar .fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #24a79c);
}

.budget-bar.warning .fill {
  background: linear-gradient(90deg, var(--clay), #dd8a55);
}

.budget-bar.exhausted .fill {
  background: linear-gradient(90deg, var(--red), #d77d63);
}

.no-data {
  margin-top: 18px;
  padding: 28px;
  border-radius: var(--radius);
  border: 1px dashed var(--border-strong);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.55);
  text-align: center;
}

@media (max-width: 980px) {
  .practice-hero,
  .dashboard-hero,
  .lesson-grid,
  .leaderboard-split,
  .lesson-engine-grid,
  .distribution-grid,
  .keyboard-readout,
  .session-results-layout,
  .dashboard-grid {
    grid-template-columns: 1fr;
  }

  .session-actions {
    justify-content: flex-start;
  }

  .analysis-keyboard-board {
    min-width: 860px;
  }
}

@media (max-width: 720px) {
  .page-shell,
  .site-header {
    width: min(100vw - 24px, 1180px);
  }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-card,
  .panel,
  .session-results {
    padding: 20px;
  }

  .session-results-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .stats-bar,
  .hero-stats,
  .dynamics-sections {
    grid-template-columns: 1fr;
  }

  .analysis-keyboard-board {
    min-width: 720px;
  }

  .keyboard-row-2,
  .keyboard-row-3,
  .keyboard-row-4,
  .keyboard-row-5 {
    padding-left: 0;
  }

  .key {
    width: 40px;
    height: 40px;
  }

  .key.space {
    width: 220px;
  }
}