:root {
  color-scheme: dark;
  --bg: #0c0f1d;
  --bg-soft: #111528;
  --panel: rgba(23, 28, 51, 0.94);
  --panel-strong: #171c33;
  --panel-light: #202643;
  --line: rgba(198, 208, 255, 0.14);
  --line-strong: rgba(198, 208, 255, 0.26);
  --text: #f5f7ff;
  --text-soft: #c3c9df;
  --muted: #8e97b8;
  --primary: #8f7cff;
  --primary-strong: #aa9cff;
  --secondary: #4fd8bf;
  --accent: #ffb86b;
  --danger: #ff7b94;
  --success: #61e3a5;
  --warning: #ffd479;
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.26);
  --radius-lg: 20px;
  --radius-md: 13px;
  --radius-sm: 9px;
  --font-ui: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  --font-code: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --track-1: #9d8cff;
  --track-2: #55d9c0;
  --track-3: #ffb86b;
  --track-4: #ff7b94;
  --track-5: #70b7ff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  font-family: var(--font-ui);
  color: var(--text);
  background:
    radial-gradient(circle at 8% 4%, rgba(143, 124, 255, 0.15), transparent 30rem),
    radial-gradient(circle at 92% 8%, rgba(79, 216, 191, 0.11), transparent 28rem),
    linear-gradient(180deg, #0e1121 0%, var(--bg) 55%, #090b15 100%);
}

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

button,
select,
input[type="range"] {
  accent-color: var(--primary);
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible,
.CodeMirror-focused {
  outline: 3px solid rgba(143, 124, 255, 0.55);
  outline-offset: 2px;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 8px;
  left: 8px;
  padding: 10px 14px;
  color: #0b1020;
  background: var(--warning);
  border-radius: 8px;
  transform: translateY(-160%);
  transition: transform 0.18s ease;
}

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

.topbar {
  position: sticky;
  z-index: 100;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 11px clamp(16px, 2.5vw, 34px);
  border-bottom: 1px solid var(--line);
  background: rgba(11, 14, 27, 0.87);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.17);
  backdrop-filter: blur(20px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  flex: 0 0 auto;
  filter: drop-shadow(0 8px 20px rgba(143, 124, 255, 0.3));
}

.brand h1 {
  margin: 0;
  font-size: clamp(1.15rem, 2vw, 1.55rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
}

.brand-kicker,
.eyebrow {
  margin: 0 0 3px;
  color: var(--secondary);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.topbar-status {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 30px;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text-soft);
  background: rgba(255, 255, 255, 0.035);
  font-size: 0.76rem;
  font-weight: 700;
  white-space: nowrap;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 4px currentColor;
  opacity: 0.7;
}

.status-loading {
  color: var(--warning);
}

.status-loading .status-dot {
  animation: pulse 1.25s ease-in-out infinite;
}

.status-ready,
.status-success {
  color: var(--success);
}

.status-error {
  color: var(--danger);
}

.status-muted {
  color: var(--muted);
}

@keyframes pulse {
  0%, 100% { opacity: 0.35; transform: scale(0.82); }
  50% { opacity: 0.95; transform: scale(1); }
}

.icon-button,
.transport-button,
.button {
  border: 0;
  cursor: pointer;
  transition: transform 0.16s ease, background 0.16s ease, border-color 0.16s ease, opacity 0.16s ease;
}

.icon-button:hover,
.transport-button:hover:not(:disabled),
.button:hover:not(:disabled) {
  transform: translateY(-1px);
}

.icon-button:disabled,
.transport-button:disabled,
.button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

.icon-button {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--text);
  background: transparent;
  font-weight: 800;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(260px, 0.72fr) minmax(430px, 1.18fr) minmax(390px, 1.1fr);
  gap: 16px;
  width: min(1920px, 100%);
  margin: 0 auto;
  padding: 16px;
  align-items: start;
}

.panel {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(27, 32, 58, 0.97), rgba(18, 22, 42, 0.97));
  box-shadow: var(--shadow);
}

.lesson-panel,
.code-panel,
.music-panel {
  min-height: calc(100vh - 105px);
}

.panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 18px 14px;
  border-bottom: 1px solid var(--line);
}

.panel-heading h2,
.section-heading-row h3 {
  margin: 0;
  letter-spacing: -0.018em;
}

.panel-heading h2 {
  font-size: 1.12rem;
}

.section-heading-row h3 {
  font-size: 1rem;
}

.progress-label {
  color: var(--text-soft);
  font-size: 0.78rem;
  font-weight: 800;
}

.progress-track {
  height: 4px;
  background: rgba(255, 255, 255, 0.05);
}

.progress-bar {
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transition: width 0.28s ease;
}

.lesson-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 7px;
  padding: 14px 14px 12px;
  border-bottom: 1px solid var(--line);
}

.lesson-button {
  position: relative;
  display: grid;
  min-height: 48px;
  padding: 7px 5px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 11px;
  color: var(--text-soft);
  background: rgba(255, 255, 255, 0.025);
  cursor: pointer;
  font-weight: 800;
}

.lesson-button:hover {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.055);
}

.lesson-button.is-active {
  border-color: rgba(143, 124, 255, 0.62);
  color: var(--text);
  background: linear-gradient(145deg, rgba(143, 124, 255, 0.24), rgba(79, 216, 191, 0.08));
}

.lesson-button.is-complete::after {
  content: "✓";
  position: absolute;
  top: -4px;
  right: -4px;
  display: grid;
  width: 18px;
  height: 18px;
  place-items: center;
  border: 2px solid var(--panel-strong);
  border-radius: 50%;
  color: #07150e;
  background: var(--success);
  font-size: 0.68rem;
}

.lesson-number {
  font-size: 0.76rem;
}

.lesson-button small {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.58rem;
  font-weight: 700;
}

.lesson-content {
  max-height: calc(100vh - 265px);
  overflow: auto;
  padding: 18px;
  scrollbar-color: var(--line-strong) transparent;
}

.lesson-content h3 {
  margin: 0 0 8px;
  font-size: 1.26rem;
  line-height: 1.35;
}

.lesson-content h4 {
  margin: 22px 0 8px;
  font-size: 0.93rem;
}

.lesson-content p,
.lesson-content li {
  color: var(--text-soft);
  font-size: 0.88rem;
  line-height: 1.75;
}

.lesson-content ul,
.lesson-content ol {
  padding-left: 1.35rem;
}

.lesson-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0 16px;
}

.meta-pill,
.concept-pill {
  display: inline-flex;
  align-items: center;
  min-height: 25px;
  padding: 4px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text-soft);
  background: rgba(255, 255, 255, 0.035);
  font-size: 0.7rem;
  font-weight: 750;
}

.concept-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.concept-pill {
  color: #dcd6ff;
  border-color: rgba(143, 124, 255, 0.28);
  background: rgba(143, 124, 255, 0.1);
  font-family: var(--font-code);
}

.lesson-callout,
.syntax-card,
.dialog-note {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.035);
}

.lesson-callout {
  padding: 13px 14px;
  border-left: 3px solid var(--secondary);
}

.lesson-callout strong {
  display: block;
  margin-bottom: 4px;
  color: var(--text);
}

.lesson-callout p {
  margin: 0;
}

.syntax-list {
  display: grid;
  gap: 8px;
}

.syntax-card {
  padding: 10px 11px;
}

.syntax-card code,
.lesson-content code,
.challenge-card code {
  color: #cfc7ff;
  font-family: var(--font-code);
  font-size: 0.86em;
}

.syntax-card strong {
  display: block;
  margin-bottom: 4px;
  color: var(--text);
  font-family: var(--font-code);
  font-size: 0.83rem;
}

.syntax-card p {
  margin: 0;
  font-size: 0.79rem;
}

.lesson-step {
  margin: 9px 0;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: rgba(8, 11, 23, 0.24);
}

.lesson-step summary,
.event-details summary {
  cursor: pointer;
  list-style: none;
  font-weight: 800;
}

.lesson-step summary::-webkit-details-marker,
.event-details summary::-webkit-details-marker {
  display: none;
}

.lesson-step summary {
  padding: 11px 12px;
  color: var(--text);
  font-size: 0.82rem;
}

.lesson-step summary::before,
.event-details summary::before {
  content: "+";
  display: inline-block;
  width: 18px;
  color: var(--secondary);
  font-weight: 900;
}

.lesson-step[open] summary::before,
.event-details[open] summary::before {
  content: "−";
}

.lesson-step div {
  padding: 0 12px 12px 30px;
}

.lesson-step p {
  margin: 0;
  font-size: 0.8rem;
}

.complete-lesson {
  width: 100%;
  margin-top: 16px;
}

.code-heading {
  flex-wrap: wrap;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 7px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 8px 12px;
  border-radius: 10px;
  color: var(--text);
  font-size: 0.79rem;
  font-weight: 800;
  text-decoration: none;
}

.button-primary {
  color: #0b0e1a;
  background: linear-gradient(135deg, #a99bff, #5fe0c8);
  box-shadow: 0 8px 24px rgba(111, 202, 201, 0.18);
}

.button-quiet {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.button-quiet:hover:not(:disabled) {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.075);
}

.editor-note {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 16px;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  background: rgba(8, 11, 24, 0.38);
  font-size: 0.74rem;
}

.editor-note-icon {
  display: grid;
  width: 24px;
  height: 24px;
  place-items: center;
  border-radius: 7px;
  color: var(--secondary);
  background: rgba(79, 216, 191, 0.1);
  font-weight: 900;
}

kbd {
  padding: 2px 5px;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: 5px;
  color: var(--text-soft);
  background: rgba(255, 255, 255, 0.045);
  font-family: var(--font-code);
  font-size: 0.73em;
}

.editor-shell {
  min-height: 470px;
  background: #0b0e1a;
}

#code-editor {
  width: 100%;
  min-height: 470px;
  resize: vertical;
  padding: 18px;
  border: 0;
  color: #eaf0ff;
  background: #0b0e1a;
  font-family: var(--font-code);
  font-size: 14px;
  line-height: 1.7;
}

.CodeMirror {
  height: 470px;
  color: #edf1ff;
  background: #0b0e1a;
  font-family: var(--font-code);
  font-size: 14px;
  line-height: 1.68;
}

.CodeMirror-gutters {
  border-right: 1px solid rgba(198, 208, 255, 0.09);
  background: #0d1020;
}

.CodeMirror-linenumber {
  color: #59617e;
}

.CodeMirror-cursor {
  border-left-color: #f4f7ff;
}

.CodeMirror-selected {
  background: rgba(143, 124, 255, 0.24) !important;
}

.CodeMirror-activeline-background {
  background: rgba(255, 255, 255, 0.025);
}

.cm-s-default .cm-keyword { color: #ff88af; }
.cm-s-default .cm-def { color: #73d9ff; }
.cm-s-default .cm-variable { color: #ecf0ff; }
.cm-s-default .cm-variable-2 { color: #b6a7ff; }
.cm-s-default .cm-variable-3 { color: #56dfc6; }
.cm-s-default .cm-number { color: #ffca78; }
.cm-s-default .cm-string { color: #8fe6a7; }
.cm-s-default .cm-comment { color: #707998; font-style: italic; }
.cm-s-default .cm-operator { color: #d7b4ff; }
.cm-s-default .cm-builtin { color: #7ab9ff; }
.cm-s-default .cm-meta { color: #ffd477; }
.cm-s-default .cm-error { color: #fff; background: rgba(255, 69, 107, 0.5); }

.error-line {
  background: rgba(255, 80, 112, 0.16) !important;
}

.changed-line {
  background: rgba(79, 216, 191, 0.14) !important;
  transition: background 0.6s ease;
}

.run-bar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(14, 18, 34, 0.86);
}

.button-run {
  min-width: 150px;
  min-height: 43px;
}

.run-message {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.5;
}

.run-message.is-success { color: var(--success); }
.run-message.is-error { color: var(--danger); }
.run-message.is-loading { color: var(--warning); }

.output-section {
  min-height: 215px;
}

.output-tabs {
  display: flex;
  gap: 2px;
  padding: 9px 12px 0;
  background: rgba(6, 9, 19, 0.28);
}

.output-tab {
  padding: 8px 12px;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  font-size: 0.76rem;
  font-weight: 800;
}

.output-tab.is-active {
  color: var(--text);
  border-bottom-color: var(--primary);
}

.output-panel {
  min-height: 170px;
}

.console-output {
  min-height: 170px;
  max-height: 260px;
  overflow: auto;
  margin: 0;
  padding: 16px;
  color: #d9def0;
  background: rgba(5, 7, 15, 0.5);
  font-family: var(--font-code);
  font-size: 0.78rem;
  line-height: 1.62;
  white-space: pre-wrap;
  word-break: break-word;
}

.error-help {
  min-height: 170px;
  padding: 16px;
  background: rgba(5, 7, 15, 0.42);
}

.empty-state {
  display: grid;
  place-items: center;
  color: var(--muted);
  font-size: 0.82rem;
  text-align: center;
}

.error-help h3 {
  margin: 0 0 8px;
  color: var(--danger);
  font-size: 1rem;
}

.error-help p,
.error-help li {
  color: var(--text-soft);
  font-size: 0.8rem;
  line-height: 1.65;
}

.error-help ul {
  padding-left: 1.25rem;
}

.original-error {
  overflow: auto;
  padding: 10px;
  border: 1px solid rgba(255, 123, 148, 0.22);
  border-radius: 9px;
  color: #ffc7d2;
  background: rgba(255, 80, 112, 0.07);
  font-family: var(--font-code);
  font-size: 0.72rem;
  line-height: 1.55;
  white-space: pre-wrap;
}

.music-panel {
  padding-bottom: 16px;
}

.transport {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  background: rgba(11, 14, 28, 0.52);
}

.transport-button {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--text);
  background: rgba(255, 255, 255, 0.045);
  font-size: 0.86rem;
  font-weight: 900;
}

.transport-play {
  width: 48px;
  height: 48px;
  border: 0;
  color: #0b0f1d;
  background: linear-gradient(145deg, var(--primary-strong), var(--secondary));
  box-shadow: 0 8px 22px rgba(143, 124, 255, 0.24);
}

.toggle-control,
.volume-control {
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--text-soft);
  font-size: 0.75rem;
  font-weight: 750;
}

.toggle-control {
  margin-left: 3px;
}

.volume-control {
  flex: 1;
  justify-content: flex-end;
}

.volume-control input {
  width: min(120px, 22vw);
}

.parameter-lab,
.visual-section {
  padding: 16px;
  border-bottom: 1px solid var(--line);
}

.parameter-lab {
  background: linear-gradient(135deg, rgba(143, 124, 255, 0.085), rgba(79, 216, 191, 0.045));
}

.section-heading-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 13px;
}

.parameter-message {
  color: var(--muted);
  font-size: 0.7rem;
  text-align: right;
}

.parameter-message.is-changed {
  color: var(--secondary);
}

.parameter-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 12px;
}

.field-control {
  display: grid;
  gap: 8px;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: rgba(10, 13, 27, 0.44);
}

.field-control > span {
  color: var(--text-soft);
  font-size: 0.75rem;
  font-weight: 750;
}

.field-control strong {
  color: var(--accent);
}

.field-control select {
  width: 100%;
  min-height: 35px;
  padding: 6px 9px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  color: var(--text);
  background: var(--panel-light);
}

.song-summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  padding: 14px 16px 2px;
}

.summary-card {
  display: grid;
  gap: 3px;
  min-width: 0;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.03);
}

.summary-label {
  overflow: hidden;
  color: var(--muted);
  font-size: 0.63rem;
  font-weight: 750;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.summary-card strong {
  overflow: hidden;
  color: var(--text);
  font-size: 0.98rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.canvas-wrap {
  position: relative;
  min-height: 310px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: #090c17;
}

#piano-roll {
  display: block;
  width: 100%;
  height: 310px;
}

.event-details {
  margin: 0 16px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.025);
}

.event-details summary {
  padding: 12px 13px;
  color: var(--text-soft);
  font-size: 0.78rem;
}

.table-wrap {
  max-height: 280px;
  overflow: auto;
  border-top: 1px solid var(--line);
}

.event-table {
  width: 100%;
  border-collapse: collapse;
  color: var(--text-soft);
  font-size: 0.72rem;
}

.event-table th,
.event-table td {
  padding: 8px 9px;
  border-bottom: 1px solid rgba(198, 208, 255, 0.07);
  text-align: left;
  white-space: nowrap;
}

.event-table th {
  position: sticky;
  z-index: 2;
  top: 0;
  color: var(--text);
  background: #151a30;
  font-weight: 800;
}

.event-table tbody tr:hover {
  background: rgba(143, 124, 255, 0.065);
}

.challenge-card {
  margin: 0 16px;
  padding: 14px;
  border: 1px solid rgba(255, 184, 107, 0.25);
  border-radius: 13px;
  background: linear-gradient(140deg, rgba(255, 184, 107, 0.09), rgba(143, 124, 255, 0.055));
}

.challenge-card h3 {
  margin: 0 0 7px;
  color: var(--accent);
  font-size: 0.9rem;
}

.challenge-card p,
.challenge-card li {
  color: var(--text-soft);
  font-size: 0.78rem;
  line-height: 1.65;
}

.challenge-card ul {
  margin: 8px 0 0;
  padding-left: 1.2rem;
}

.button-colab {
  width: 100%;
  margin-top: 12px;
  border: 1px solid rgba(79, 216, 191, 0.3);
  background: rgba(79, 216, 191, 0.09);
}

.button-colab:hover {
  border-color: rgba(79, 216, 191, 0.55);
  background: rgba(79, 216, 191, 0.15);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 24px 26px;
  color: var(--muted);
  font-size: 0.72rem;
}

.site-footer p {
  margin: 0;
}

.help-dialog {
  width: min(560px, calc(100vw - 32px));
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 18px;
  color: var(--text);
  background: linear-gradient(180deg, #1b213c, #12162a);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.58);
}

.help-dialog::backdrop {
  background: rgba(2, 4, 10, 0.72);
  backdrop-filter: blur(6px);
}

.help-dialog form {
  position: relative;
  padding: 28px;
}

.help-dialog h2 {
  margin: 0 0 16px;
}

.dialog-close {
  position: absolute;
  top: 12px;
  right: 12px;
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
  font-size: 1.2rem;
}

.help-steps {
  display: grid;
  gap: 11px;
  padding-left: 1.4rem;
  color: var(--text-soft);
  line-height: 1.65;
}

.dialog-note {
  margin: 16px 0;
  padding: 12px 13px;
  color: var(--text-soft);
  font-size: 0.8rem;
  line-height: 1.6;
}

.noscript-message {
  position: fixed;
  z-index: 999;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 30px;
  color: white;
  background: #101427;
  text-align: center;
}

@media (max-width: 1450px) {
  .app-shell {
    grid-template-columns: minmax(250px, 0.72fr) minmax(430px, 1.25fr);
  }

  .music-panel {
    grid-column: 1 / -1;
    min-height: auto;
  }

  .music-panel .canvas-wrap {
    min-height: 360px;
  }

  #piano-roll {
    height: 360px;
  }
}

@media (max-width: 940px) {
  .topbar {
    position: relative;
    align-items: flex-start;
  }

  .topbar-status {
    flex-wrap: wrap;
  }

  .status-chip.status-muted {
    display: none;
  }

  .app-shell {
    grid-template-columns: 1fr;
  }

  .lesson-panel,
  .code-panel,
  .music-panel {
    min-height: auto;
  }

  .lesson-content {
    max-height: none;
  }

  .lesson-nav {
    grid-template-columns: repeat(7, minmax(46px, 1fr));
    overflow-x: auto;
  }

  .music-panel {
    grid-column: auto;
  }
}

@media (max-width: 620px) {
  .topbar {
    gap: 10px;
    padding: 10px 12px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .brand-kicker {
    display: none;
  }

  .brand {
    gap: 8px;
  }

  .brand h1 {
    max-width: 160px;
    overflow: hidden;
    font-size: 0.94rem;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  #python-status {
    width: 32px;
    max-width: 32px;
    justify-content: center;
    gap: 0;
    overflow: hidden;
    padding-inline: 8px;
    font-size: 0;
  }

  .app-shell {
    gap: 12px;
    padding: 10px;
  }

  .panel {
    border-radius: 15px;
  }

  .panel-heading {
    padding: 15px 14px 12px;
  }

  .compact-toolbar {
    width: 100%;
  }

  .compact-toolbar .button {
    flex: 1;
  }

  .lesson-nav {
    grid-template-columns: repeat(7, 55px);
  }

  .lesson-content {
    padding: 15px;
  }

  .editor-shell,
  #code-editor,
  .CodeMirror {
    min-height: 420px;
    height: 420px;
  }

  .run-bar {
    align-items: stretch;
    flex-direction: column;
  }

  .button-run {
    width: 100%;
  }

  .transport {
    flex-wrap: wrap;
  }

  .volume-control {
    width: 100%;
    justify-content: flex-start;
  }

  .volume-control input {
    flex: 1;
    width: auto;
  }

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

  .section-heading-row {
    align-items: flex-start;
  }

  .parameter-message {
    max-width: 140px;
  }

  .song-summary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .canvas-wrap,
  #piano-roll {
    min-height: 270px;
    height: 270px;
  }

  .site-footer {
    flex-direction: column;
    padding: 4px 14px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* --------------------------------------------------------------------------
   Public-site navigation and content pages (v1.0.0)
   -------------------------------------------------------------------------- */

a {
  color: inherit;
}

.site-topbar {
  gap: clamp(12px, 2vw, 28px);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
}

.site-brand img {
  width: 46px;
  height: 46px;
  object-fit: contain;
  filter: drop-shadow(0 7px 18px rgba(87, 209, 255, 0.28));
}

.site-brand span {
  display: grid;
  gap: 1px;
}

.site-brand small {
  color: var(--secondary);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.site-brand strong {
  font-size: clamp(0.95rem, 1.4vw, 1.22rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-left: auto;
}

.site-nav a {
  position: relative;
  padding: 9px 11px;
  border-radius: 10px;
  color: var(--text-soft);
  font-size: 0.78rem;
  font-weight: 760;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--text);
  background: rgba(255, 255, 255, 0.055);
}

.site-nav a.is-current {
  color: var(--text);
  background: linear-gradient(145deg, rgba(143, 124, 255, 0.22), rgba(79, 216, 191, 0.10));
}

.site-nav a.is-current::after {
  content: "";
  position: absolute;
  right: 11px;
  bottom: 4px;
  left: 11px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--secondary), var(--primary));
}

.menu-button {
  display: none;
  padding: 8px 11px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
  font-size: 0.76rem;
  font-weight: 800;
}

.app-topbar .topbar-status {
  flex: 0 0 auto;
}

.content-section {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
  padding: clamp(62px, 8vw, 108px) 0;
}

.section-intro {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-intro h2,
.feature-copy h2,
.knowledge-section h2 {
  margin: 0 0 14px;
  font-size: clamp(1.75rem, 3.6vw, 3rem);
  line-height: 1.18;
  letter-spacing: -0.045em;
}

.section-intro > p:last-child,
.feature-copy > p,
.lead-paragraph {
  color: var(--text-soft);
  font-size: clamp(0.94rem, 1.5vw, 1.08rem);
  line-height: 1.9;
}

.compact-intro {
  max-width: 860px;
}

.home-hero {
  position: relative;
  min-height: min(780px, calc(100vh - 72px));
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: #050817;
}

.home-hero-image,
.home-hero-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.home-hero-image {
  object-fit: cover;
  object-position: center;
}

.home-hero-shade {
  background:
    linear-gradient(90deg, rgba(4, 8, 21, 0.24), rgba(4, 8, 21, 0.07) 55%, rgba(4, 8, 21, 0.22)),
    linear-gradient(180deg, rgba(2, 5, 17, 0.06), rgba(2, 5, 17, 0.12) 55%, rgba(7, 9, 22, 0.88));
}

.home-hero-content {
  position: relative;
  z-index: 2;
  display: flex;
  min-height: min(780px, calc(100vh - 72px));
  width: min(1180px, calc(100% - 34px));
  margin: 0 auto;
  padding: clamp(54px, 10vh, 120px) 0 clamp(54px, 9vh, 92px);
  align-items: flex-end;
  flex-direction: column;
  justify-content: flex-end;
  text-align: center;
}

.home-hero-logo {
  width: min(880px, 92vw);
  max-height: 245px;
  object-fit: contain;
  filter: drop-shadow(0 16px 30px rgba(0, 0, 0, 0.42));
}

.home-hero-lead {
  margin: 4px 0 24px;
  color: #f4f8ff;
  font-size: clamp(1.05rem, 2.1vw, 1.52rem);
  font-weight: 680;
  line-height: 1.65;
  text-shadow: 0 3px 16px rgba(0, 0, 0, 0.75);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.button-large {
  min-height: 48px;
  padding: 12px 20px;
  font-size: 0.88rem;
  text-decoration: none;
}

.button-glass {
  border: 1px solid rgba(255, 255, 255, 0.36);
  color: white;
  background: rgba(8, 13, 34, 0.48);
  backdrop-filter: blur(14px);
}

.button-glass:hover {
  border-color: rgba(255, 255, 255, 0.62);
  background: rgba(16, 22, 49, 0.7);
}

.route-section {
  padding-bottom: 48px;
}

.route-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.route-card {
  position: relative;
  min-height: 275px;
  overflow: hidden;
  padding: 27px;
  border: 1px solid var(--line);
  border-radius: 22px;
  color: var(--text);
  background:
    radial-gradient(circle at 100% 0, rgba(143, 124, 255, 0.17), transparent 14rem),
    linear-gradient(160deg, rgba(31, 38, 70, 0.96), rgba(17, 22, 43, 0.98));
  box-shadow: var(--shadow);
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.route-card:hover {
  border-color: rgba(112, 183, 255, 0.46);
  transform: translateY(-4px);
}

.route-card:nth-child(2) {
  background:
    radial-gradient(circle at 100% 0, rgba(79, 216, 191, 0.16), transparent 14rem),
    linear-gradient(160deg, rgba(27, 50, 62, 0.96), rgba(17, 25, 42, 0.98));
}

.route-card:nth-child(3) {
  background:
    radial-gradient(circle at 100% 0, rgba(255, 184, 107, 0.16), transparent 14rem),
    linear-gradient(160deg, rgba(49, 36, 61, 0.96), rgba(23, 20, 42, 0.98));
}

.route-number {
  color: var(--secondary);
  font-family: var(--font-code);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.route-card h3 {
  margin: 35px 0 12px;
  font-size: 1.55rem;
  letter-spacing: -0.03em;
}

.route-card p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.88rem;
  line-height: 1.8;
}

.route-link {
  position: absolute;
  bottom: 25px;
  left: 27px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
}

.cycle-section {
  width: min(1320px, calc(100% - 32px));
}

.learning-cycle {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.learning-cycle li {
  min-height: 220px;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(25, 31, 57, 0.78);
}

.learning-cycle li > span {
  display: grid;
  width: 34px;
  height: 34px;
  margin-bottom: 30px;
  place-items: center;
  border: 1px solid rgba(79, 216, 191, 0.38);
  border-radius: 50%;
  color: var(--secondary);
  font-family: var(--font-code);
  font-size: 0.75rem;
  font-weight: 800;
}

.learning-cycle strong {
  display: block;
  margin-bottom: 9px;
  font-size: 1rem;
}

.learning-cycle p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.79rem;
  line-height: 1.75;
}

.feature-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(380px, 0.9fr);
  gap: clamp(35px, 7vw, 90px);
  align-items: center;
}

.check-list {
  display: grid;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 26px;
  color: var(--text-soft);
  font-size: 0.86rem;
  line-height: 1.7;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: 900;
}

.feature-visual {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 10px;
  align-items: center;
}

.flow-card {
  display: grid;
  min-height: 150px;
  padding: 18px;
  place-items: center;
  align-content: center;
  gap: 12px;
  border: 1px solid var(--line-strong);
  border-radius: 17px;
  background: linear-gradient(160deg, rgba(31, 38, 70, 0.94), rgba(16, 20, 39, 0.96));
  text-align: center;
}

.flow-card code,
.flow-card strong {
  color: var(--primary-strong);
  font-size: clamp(0.86rem, 1.4vw, 1.1rem);
}

.flow-card span {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.flow-arrow {
  color: var(--secondary);
  font-size: 1.3rem;
}

.rich-footer {
  align-items: center;
  justify-content: center;
  min-height: 110px;
  padding: 25px 24px;
  border-top: 1px solid var(--line);
  background: rgba(7, 9, 19, 0.62);
}

.rich-footer img {
  width: 50px;
  height: 50px;
  object-fit: contain;
}

.rich-footer div {
  margin-right: auto;
}

.rich-footer strong {
  color: var(--text);
  font-size: 0.9rem;
}

.rich-footer p {
  margin-top: 3px;
}

.footer-version {
  font-family: var(--font-code);
}

/* Knowledge library */

.knowledge-main {
  width: min(1380px, calc(100% - 32px));
  margin: 0 auto;
  padding-bottom: 70px;
}

.page-hero {
  padding: clamp(62px, 8vw, 110px) 0 clamp(45px, 6vw, 75px);
}

.compact-page-hero {
  max-width: 980px;
}

.page-hero h1 {
  margin: 0 0 18px;
  font-size: clamp(2rem, 5vw, 4.3rem);
  line-height: 1.12;
  letter-spacing: -0.055em;
}

.page-hero > p:not(.eyebrow) {
  max-width: 760px;
  color: var(--text-soft);
  font-size: clamp(0.98rem, 1.7vw, 1.16rem);
  line-height: 1.9;
}

.knowledge-search {
  display: grid;
  max-width: 680px;
  gap: 7px;
  margin-top: 28px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 760;
}

.knowledge-search input {
  width: 100%;
  min-height: 48px;
  padding: 10px 15px;
  border: 1px solid var(--line-strong);
  border-radius: 13px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.055);
}

.knowledge-layout {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: clamp(28px, 5vw, 70px);
  align-items: start;
}

.knowledge-index {
  position: sticky;
  top: 95px;
  display: grid;
  gap: 5px;
  padding: 17px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(19, 24, 46, 0.86);
}

.knowledge-index strong {
  margin-bottom: 8px;
  color: var(--secondary);
  font-size: 0.64rem;
  letter-spacing: 0.15em;
}

.knowledge-index a {
  padding: 8px 9px;
  border-radius: 8px;
  color: var(--text-soft);
  font-size: 0.78rem;
  text-decoration: none;
}

.knowledge-index a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}

.knowledge-content {
  min-width: 0;
}

.knowledge-section {
  padding: 18px 0 74px;
  scroll-margin-top: 95px;
}

.knowledge-section + .knowledge-section {
  border-top: 1px solid var(--line);
  padding-top: 70px;
}

.knowledge-section > h2 {
  max-width: 900px;
}

.text-link {
  color: var(--secondary);
  font-size: 0.76rem;
  font-weight: 800;
  text-decoration: none;
}

.knowledge-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 13px;
  margin-top: 24px;
}

.knowledge-card-grid.three-columns {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.knowledge-card,
.knowledge-note,
.definition-list article,
.code-patterns article {
  padding: 19px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: rgba(25, 31, 57, 0.74);
}

.knowledge-card > code {
  display: inline-block;
  margin-bottom: 14px;
  color: var(--secondary);
  font-family: var(--font-code);
  font-size: 0.75rem;
}

.knowledge-card h3,
.knowledge-note h3,
.definition-list h3,
.code-patterns h3 {
  margin: 0 0 8px;
  font-size: 0.96rem;
}

.knowledge-card p,
.knowledge-note p,
.definition-list p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.79rem;
  line-height: 1.75;
}

.knowledge-card[hidden],
.knowledge-section[hidden] {
  display: none !important;
}

.concept-ladder {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin: 28px 0;
}

.concept-ladder article {
  padding: 20px;
  border-top: 2px solid var(--primary);
  border-radius: 0 0 14px 14px;
  background: rgba(143, 124, 255, 0.07);
}

.concept-ladder span {
  color: var(--muted);
  font-family: var(--font-code);
  font-size: 0.7rem;
}

.concept-ladder h3 {
  margin: 20px 0 8px;
  font-size: 1rem;
}

.concept-ladder p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.77rem;
  line-height: 1.65;
}

.knowledge-split {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 13px;
}

.definition-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 13px;
  margin-top: 24px;
}

.definition-list code,
.code-patterns code {
  color: var(--secondary);
  font-family: var(--font-code);
}

.dtm-diagram {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 11px;
  margin: 26px 0;
}

.dtm-diagram div {
  min-height: 130px;
  padding: 18px;
  border: 1px solid var(--line-strong);
  border-radius: 15px;
  background: linear-gradient(145deg, rgba(79, 216, 191, 0.08), rgba(143, 124, 255, 0.08));
}

.dtm-diagram strong,
.dtm-diagram span {
  display: block;
}

.dtm-diagram strong {
  margin-bottom: 30px;
}

.dtm-diagram span {
  color: var(--text-soft);
  font-size: 0.76rem;
  line-height: 1.65;
}

.code-patterns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.code-patterns pre {
  max-width: 100%;
  overflow: auto;
  margin: 14px 0 0;
  padding: 14px;
  border: 1px solid rgba(198, 208, 255, 0.09);
  border-radius: 11px;
  background: #0b0e1b;
  font-size: 0.72rem;
  line-height: 1.65;
}

.knowledge-empty {
  padding: 30px;
  border: 1px dashed var(--line-strong);
  border-radius: 14px;
  color: var(--text-soft);
  text-align: center;
}

/* Lesson activities */

.lesson-nav-copy {
  display: grid;
  min-width: 0;
  place-items: center;
}

.lesson-activity-dots {
  display: flex;
  gap: 3px;
  margin-top: 4px;
}

.activity-dot {
  display: grid;
  width: 15px;
  height: 15px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.03);
  font-size: 0.48rem;
  line-height: 1;
}

.activity-dot.is-optional {
  border-style: dashed;
}

.activity-dot.is-complete {
  border-color: var(--success);
  color: #06170e;
  background: var(--success);
}

.bridge-callout {
  margin: 16px 0 19px;
  padding: 13px 14px;
  border-left: 3px solid var(--secondary);
  border-radius: 0 11px 11px 0;
  background: rgba(79, 216, 191, 0.07);
}

.bridge-callout strong {
  color: var(--secondary);
  font-size: 0.76rem;
}

.bridge-callout p {
  margin: 5px 0 0;
  color: var(--text-soft);
  font-size: 0.76rem;
  line-height: 1.65;
}

.activity-choices {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.activity-choice {
  display: grid;
  min-height: 66px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 11px;
  color: var(--text-soft);
  background: rgba(255, 255, 255, 0.025);
  cursor: pointer;
  text-align: left;
}

.activity-choice:hover {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.05);
}

.activity-choice.is-active {
  border-color: rgba(143, 124, 255, 0.7);
  color: var(--text);
  background: rgba(143, 124, 255, 0.14);
}

.activity-choice.is-complete {
  box-shadow: inset 0 -2px 0 var(--success);
}

.activity-choice span {
  font-size: 0.78rem;
  font-weight: 800;
}

.activity-choice small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.63rem;
}

.activity-note {
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 0.67rem;
  line-height: 1.55;
}

.challenge-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.challenge-level,
.challenge-state {
  display: inline-flex;
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 0.64rem;
  font-weight: 850;
}

.challenge-level {
  color: #231305;
  background: var(--accent);
}

.challenge-state {
  border: 1px solid var(--line-strong);
  color: var(--muted);
}

.challenge-state.is-complete {
  border-color: rgba(97, 227, 165, 0.45);
  color: var(--success);
  background: rgba(97, 227, 165, 0.08);
}

.challenge-card h4 {
  margin: 14px 0 4px;
  font-size: 0.76rem;
}

.challenge-card ol {
  margin: 7px 0 0;
  padding-left: 1.25rem;
}

.reflection-box {
  margin-top: 13px;
  padding: 11px 12px;
  border: 1px solid rgba(79, 216, 191, 0.22);
  border-radius: 10px;
  background: rgba(79, 216, 191, 0.055);
}

.reflection-box strong {
  color: var(--secondary);
  font-size: 0.7rem;
}

.reflection-box p {
  margin: 4px 0 0;
}

.activity-record-note {
  color: var(--muted) !important;
  font-size: 0.68rem !important;
}

@media (max-width: 1100px) {
  .route-grid,
  .knowledge-card-grid.three-columns {
    grid-template-columns: 1fr;
  }

  .learning-cycle {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .feature-section {
    grid-template-columns: 1fr;
  }

  .feature-visual {
    max-width: 760px;
  }

  .concept-ladder,
  .dtm-diagram {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 899px) {
  .site-topbar {
    position: sticky;
    align-items: center;
    flex-wrap: wrap;
  }

  .menu-button {
    display: inline-flex;
    margin-left: auto;
  }

  .site-nav {
    display: none;
    order: 5;
    width: 100%;
    margin: 0;
    padding-top: 8px;
    border-top: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    width: 100%;
  }

  .app-topbar .topbar-status {
    margin-left: 0;
  }

  .knowledge-layout {
    grid-template-columns: 1fr;
  }

  .knowledge-index {
    position: static;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    overflow-x: auto;
  }

  .knowledge-index strong {
    display: none;
  }

  .knowledge-index a {
    text-align: center;
    white-space: nowrap;
  }
}

@media (max-width: 720px) {
  .home-hero,
  .home-hero-content {
    min-height: 660px;
  }

  .home-hero-image {
    object-position: 46% center;
  }

  .home-hero-logo {
    width: 100%;
  }

  .route-grid,
  .knowledge-card-grid,
  .knowledge-split,
  .definition-list,
  .code-patterns {
    grid-template-columns: 1fr;
  }

  .learning-cycle {
    grid-template-columns: 1fr;
  }

  .learning-cycle li {
    min-height: auto;
  }

  .feature-visual {
    grid-template-columns: 1fr;
  }

  .flow-arrow {
    transform: rotate(90deg);
    text-align: center;
  }

  .concept-ladder,
  .dtm-diagram {
    grid-template-columns: 1fr;
  }

  .knowledge-index {
    grid-template-columns: repeat(5, 130px);
  }

  .activity-choices {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .site-brand img {
    width: 38px;
    height: 38px;
  }

  .site-brand small {
    display: none;
  }

  .site-brand strong {
    max-width: 165px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .app-topbar .topbar-status {
    order: 4;
    width: 100%;
  }

  .home-hero-content {
    width: calc(100% - 22px);
    align-items: center;
  }

  .hero-actions {
    width: 100%;
  }

  .hero-actions .button {
    width: 100%;
  }

  .content-section,
  .knowledge-main {
    width: min(100% - 22px, 1200px);
  }

  .route-card {
    min-height: 250px;
    padding: 22px;
  }

  .route-link {
    left: 22px;
  }

  .rich-footer {
    align-items: flex-start;
  }

  .rich-footer div {
    margin-right: 0;
  }
}


.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}