:root {
  --font-display: 'VT323', ui-monospace, 'JetBrains Mono', monospace;
  --font-body: 'Source Serif 4', 'Source Serif Pro', 'Iowan Old Style', Georgia, serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'Consolas', monospace;
  --font-heading: var(--font-display);

  --bg: #fafaf5;
  --bg-surface: #f3f1e8;
  --bg-surface-hover: #ece9dc;
  --ink: #1a1a1a;
  --ink-soft: #4a4a4a;
  --ink-mute: #7a7a78;
  --rule: #1a1a1a;
  --rule-soft: rgba(26, 26, 26, 0.16);
  --paper-rule: rgba(26, 26, 26, 0.08);

  --blueprint: #3553ff;
  --blueprint-tint: rgba(53, 83, 255, 0.08);
  --blueprint-tint-strong: rgba(53, 83, 255, 0.18);

  --status-complete: #3553ff;
  --status-in-progress: #4a4a4a;
  --status-planned: #b8b6ad;
  --warn: #b8870f;

  --code-bg: #efece0;
  --modal-bg: #fafaf5;
  --overlay-bg: rgba(26, 26, 26, 0.55);
  --header-bg: rgba(250, 250, 245, 0.94);

  --header-offset: 92px;

  /* Blueprint motion grammar: quick feedback, restrained entrances, spatial drawers. */
  --motion-press: 160ms;
  --motion-feedback: 180ms;
  --motion-enter: 220ms;
  --motion-drawer: 250ms;
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
  --ease-drawer: cubic-bezier(0.32, 0.72, 0, 1);

  --text: var(--ink);
  --text-muted: var(--ink-soft);
  --border: var(--rule-soft);
  --accent: var(--blueprint);
  --accent-hover: #2840d6;
  --secondary: var(--blueprint);
  --complete: var(--status-complete);
  --planned: var(--status-planned);
  --shadow-color: var(--ink);
  --shadow-hard: 3px 3px 0 var(--ink);
  --shadow-hard-lg: 5px 5px 0 var(--ink);
  --dot-color: var(--paper-rule);
}

[data-theme="dark"] {
  --bg: #0a0d1a;
  --bg-surface: #131830;
  --bg-surface-hover: #1b2244;
  --ink: #e8e6dc;
  --ink-soft: #a8a6a0;
  --ink-mute: #7a7878;
  --rule: #e8e6dc;
  --rule-soft: rgba(232, 230, 220, 0.18);
  --paper-rule: rgba(232, 230, 220, 0.08);

  --blueprint: #6b8eff;
  --blueprint-tint: rgba(107, 142, 255, 0.12);
  --blueprint-tint-strong: rgba(107, 142, 255, 0.22);

  --status-complete: #6b8eff;
  --status-in-progress: #c8c6c0;
  --status-planned: #4a4a48;
  --warn: #d4a83d;

  --code-bg: #131830;
  --modal-bg: #0f1424;
  --overlay-bg: rgba(10, 13, 26, 0.78);
  --header-bg: rgba(10, 13, 26, 0.94);

  --accent-hover: #8aa5ff;
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.62;
  color: var(--ink);
  background-color: var(--bg);
  background-image: radial-gradient(var(--paper-rule) 1px, transparent 1px);
  background-size: 16px 16px;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  hyphens: auto;
  -webkit-hyphens: auto;
  transition: background-color 0.2s, color 0.2s;
}

.skip-link {
  position: fixed;
  inset-block-start: 16px;
  inset-inline-start: 16px;
  z-index: 9999;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  background: var(--blueprint);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  text-decoration: none;
  border-radius: 0;
}

.skip-link:focus,
.skip-link:focus-visible {
  width: auto;
  height: auto;
  margin: 0;
  padding: 12px 18px;
  overflow: visible;
  clip-path: none;
  white-space: normal;
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--blueprint);
}

h1 { font-size: clamp(2.4rem, 6vw, 4.4rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
h3 { font-size: clamp(1.2rem, 2.6vw, 1.6rem); }
h4 { font-size: 1.1rem; }

p {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.62;
  color: var(--ink);
}

a {
  color: var(--blueprint);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}

a:hover {
  border-bottom-color: var(--blueprint);
}

code, pre, kbd, samp {
  font-family: var(--font-mono);
}

::selection {
  background: var(--blueprint);
  color: var(--bg);
}

.ascii-rule {
  display: block;
  width: 100%;
  height: 6px;
  margin: 32px 0;
  background-image:
    repeating-linear-gradient(
      to right,
      var(--blueprint) 0,
      var(--blueprint) 4px,
      transparent 4px,
      transparent 8px
    ),
    repeating-linear-gradient(
      to right,
      transparent 0,
      transparent 8px,
      var(--blueprint-tint-strong) 8px,
      var(--blueprint-tint-strong) 14px
    );
  background-size: 100% 3px, 100% 3px;
  background-position: 0 0, 0 3px;
  background-repeat: no-repeat;
  user-select: none;
}

.label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.fig-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--blueprint);
}

.dropcap > p:first-of-type::first-letter,
p.dropcap::first-letter {
  font-family: var(--font-display);
  float: left;
  font-size: 4.2rem;
  line-height: 0.85;
  padding: 0.08em 0.12em 0 0;
  color: var(--blueprint);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule-soft);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.6rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink);
  border-bottom: none;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.logo:hover {
  color: var(--blueprint);
  border-bottom: none;
}

.logo-icon {
  display: inline-block;
  width: 12px;
  height: 12px;
  background: var(--blueprint);
}

.header-nav {
  display: flex;
  gap: 28px;
  align-items: center;
}

.header-nav a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border-bottom: none;
}

.header-nav a:hover {
  color: var(--blueprint);
  border-bottom: none;
}

.header-nav a[aria-current="page"],
.logo[aria-current="page"] {
  color: var(--blueprint);
}

.header-menu-toggle,
.header-mobile-only,
.header-mobile-tools {
  display: none;
}

.header-menu-toggle {
  width: 44px;
  height: 44px;
  flex: 0 0 44px;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--rule-soft);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}

.header-menu-toggle:hover {
  border-color: var(--blueprint);
  color: var(--blueprint);
}

.header-menu-icon {
  display: grid;
  width: 18px;
  gap: 4px;
}

.header-menu-icon span {
  display: block;
  height: 1px;
  background: currentColor;
}

.header-menu-toggle:focus-visible,
.search-toggle:focus-visible,
.theme-toggle:focus-visible,
.lang-picker-btn:focus-visible {
  outline: 2px solid var(--blueprint);
  outline-offset: 2px;
}

.header-github {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--rule-soft);
  background: var(--bg-surface);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--ink);
  text-transform: uppercase;
  transition: border-color 0.15s, color 0.15s;
}

.header-github:hover {
  border-color: var(--blueprint);
  color: var(--blueprint);
  border-bottom: 1px solid var(--blueprint);
}

.header-github svg {
  flex-shrink: 0;
}

.header-github .star-icon {
  color: var(--blueprint);
}

.header-github .star-count {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--ink);
  min-width: 1ch;
}

.header-github .star-count[data-loading="true"] {
  opacity: 0.4;
}

.theme-toggle {
  background: transparent;
  border: 1px solid var(--rule-soft);
  width: 36px;
  height: 36px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--ink);
  transition: border-color 0.15s, color 0.15s;
}

.theme-toggle:hover {
  border-color: var(--blueprint);
  color: var(--blueprint);
}

.btn {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 10px 20px;
  border: 1px solid var(--ink);
  background: var(--bg);
  color: var(--ink);
  cursor: pointer;
  display: inline-block;
  text-align: center;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.btn:hover {
  background: var(--ink);
  color: var(--bg);
  border-bottom: 1px solid var(--ink);
}

.btn-primary {
  background: var(--blueprint);
  color: var(--bg);
  border-color: var(--blueprint);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--bg);
  border-color: var(--accent-hover);
  border-bottom: 1px solid var(--accent-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}

.btn-secondary:hover {
  background: var(--ink);
  color: var(--bg);
  border-bottom: 1px solid var(--ink);
}

.section {
  padding: 80px 0;
  border-top: 1px solid var(--rule-soft);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  text-align: left;
  text-transform: uppercase;
  color: var(--blueprint);
  margin-bottom: 8px;
}

.section-subtitle {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 40px;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--motion-enter) var(--ease-out);
}

.modal-overlay.no-motion,
.modal-overlay.no-motion .modal {
  transition: none;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  position: relative;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  background: var(--modal-bg);
  border: 1px solid var(--ink);
  width: 100%;
  max-width: 820px;
  max-height: min(88vh, 860px);
  overflow: hidden;
  box-shadow: var(--shadow-hard-lg);
  transform: translateY(14px) scale(0.985);
  transition: transform var(--motion-drawer) var(--ease-drawer);
}

.modal-overlay.open .modal {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  z-index: 2;
  top: 20px;
  right: 22px;
  min-width: 78px;
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 6px 10px;
  background: var(--modal-bg);
  border: 1px solid var(--rule-soft);
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--ink-mute);
  cursor: pointer;
  line-height: 1;
  transition: transform var(--motion-press) var(--ease-out), color var(--motion-feedback) ease, border-color var(--motion-feedback) ease;
}

.modal-close::before {
  content: "Close";
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.modal-close:hover {
  color: var(--blueprint);
  border-color: var(--blueprint);
}

.modal-close:active {
  transform: scale(0.97);
}

.modal-close:focus-visible,
.modal-lesson-open:focus-visible,
.modal-lesson-toggle:focus-visible,
.modal-reset:focus-visible {
  outline: 2px solid var(--blueprint);
  outline-offset: 2px;
}

.modal-header {
  margin: 0;
  padding: 28px 126px 20px 28px;
  border-bottom: 1px solid var(--rule-soft);
}

.modal-phase-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--blueprint);
  margin-bottom: 6px;
}

.modal-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.15rem);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--ink);
  margin: 0 0 8px;
}

.modal-desc {
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1.5;
}

.modal-progress {
  width: 100%;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-mute);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.modal-progress-count {
  color: var(--blueprint);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.modal-progress-pct {
  color: var(--ink-soft);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.modal-progress-bar {
  margin-top: 8px;
  height: 3px;
  background: var(--rule-soft);
  overflow: hidden;
}

.modal-progress-bar-fill {
  height: 100%;
  background: var(--blueprint);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--motion-enter) var(--ease-out);
}

.modal-footer {
  margin: 0;
  padding: 14px 28px 16px;
  border-top: 1px solid var(--rule-soft);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.modal-footer-note {
  color: var(--ink-mute);
}

.modal-reset {
  background: transparent;
  border: 1px solid var(--rule-soft);
  color: var(--ink-mute);
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform var(--motion-press) var(--ease-out), color var(--motion-feedback) ease, border-color var(--motion-feedback) ease;
}

.modal-reset:hover {
  color: var(--blueprint);
  border-color: var(--blueprint);
}

.modal-reset:active {
  transform: scale(0.97);
}

.modal-lessons {
  display: flex;
  flex-direction: column;
  gap: 0;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 8px 20px;
}

.modal-lesson {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--rule-soft);
  transition: background-color var(--motion-feedback) ease;
}

.modal-lesson:last-child {
  border-bottom: none;
}

.modal-lesson:hover {
  background: var(--blueprint-tint);
}

.modal-lesson-open {
  min-width: 0;
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 12px 10px 12px 12px;
  color: var(--ink);
  text-decoration: none;
  border: none;
}

.modal-lesson-open:hover {
  color: var(--ink);
  border: none;
}

.modal-lesson-open.is-unavailable {
  opacity: 0.62;
}

.modal-lesson-copy {
  display: grid;
  gap: 5px;
  min-width: 0;
}

.modal-lesson-name {
  font-family: var(--font-body);
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.modal-lesson-open:hover .modal-lesson-name {
  color: var(--blueprint);
}

.modal-lesson-meta {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.modal-lesson-lang {
  color: inherit;
}

.modal-lesson-type {
  font-weight: 500;
  color: inherit;
}

.modal-lesson-type[data-type="Build"] {
  color: var(--blueprint);
}

.modal-lesson-type[data-type="Learn"] {
  color: var(--ink);
}

.modal-lesson-type[data-type="Capstone"] {
  color: var(--warn);
}

.modal-lesson-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blueprint);
}

.modal-lesson-open.is-unavailable .modal-lesson-cta {
  color: var(--ink-mute);
}

.modal-lesson-toggle {
  min-width: 104px;
  min-height: 36px;
  margin-right: 12px;
  padding: 7px 10px;
  border: 1px solid var(--rule-soft);
  background: var(--modal-bg);
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  gap: 7px;
  transition: transform var(--motion-press) var(--ease-out), background-color var(--motion-feedback) ease, border-color var(--motion-feedback) ease, color var(--motion-feedback) ease;
}

.modal-lesson-check {
  width: 14px;
  height: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 14px;
  border: 1px solid currentColor;
  font-size: 0.65rem;
  line-height: 1;
}

.modal-lesson-toggle:hover {
  border-color: var(--blueprint);
  color: var(--blueprint);
}

.modal-lesson-toggle:active {
  transform: scale(0.97);
}

.modal-lesson-toggle.done {
  background: var(--blueprint-tint);
  border-color: var(--blueprint);
  color: var(--blueprint);
}

.modal-lesson.user-done .modal-lesson-name {
  color: var(--ink-soft);
}

.copy-btn {
  background: none;
  border: none;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  cursor: pointer;
  padding: 2px 6px;
  color: var(--ink-mute);
  transition: color 0.15s;
}

.copy-btn:hover {
  color: var(--blueprint);
}

.site-footer {
  border-top: 1px solid var(--rule-soft);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-inner p {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
  text-transform: uppercase;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border-bottom: none;
}

.footer-links a:hover {
  color: var(--blueprint);
  border-bottom: none;
}

.fade-in {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal {
  transition:
    opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1) var(--stagger-delay, 0ms),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1) var(--stagger-delay, 0ms);
  will-change: opacity, transform;
}

body.js-anim .reveal {
  opacity: 0;
  transform: translateY(20px);
}

body.js-anim .reveal--left {
  transform: translateX(-20px);
}

body.js-anim .reveal.in-view {
  opacity: 1;
  transform: none;
}

.ascii-rule {
  transition: clip-path 1.1s cubic-bezier(0.22, 1, 0.36, 1) var(--stagger-delay, 0ms);
}

body.js-anim .ascii-rule {
  clip-path: inset(0 100% 0 0);
}

body.js-anim .ascii-rule.in-view {
  clip-path: inset(0 0 0 0);
}

.toc-row {
  transition:
    opacity 0.5s cubic-bezier(0.22, 1, 0.36, 1) var(--stagger-delay, 0ms),
    transform 0.5s cubic-bezier(0.22, 1, 0.36, 1) var(--stagger-delay, 0ms),
    background 0.15s;
}

body.js-anim .toc-row {
  opacity: 0;
  transform: translateY(8px);
}

body.js-anim .toc-row.in-view {
  opacity: 1;
  transform: none;
}

@keyframes title-flicker {
  0%, 100% { opacity: 1; }
  18% { opacity: 0.4; }
  20% { opacity: 1; }
  62% { opacity: 0.7; }
  64% { opacity: 1; }
}

.manual-title {
  animation: title-flicker 2.4s ease-out 0.1s 1;
}

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .ascii-rule,
  .toc-row,
  .stat-row-bar::before,
  .manual-title {
    transition: none !important;
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
    clip-path: none !important;
  }

  .modal-overlay,
  .modal,
  .modal-progress-bar-fill {
    transition: none !important;
  }
}

@media (max-width: 1024px) {
  .container {
    padding: 0 24px;
  }
}

@media (max-width: 1100px) {
  .header-inner {
    position: relative;
    justify-content: flex-start;
    gap: 8px;
  }

  .logo {
    min-width: 0;
    margin-inline-end: auto;
    white-space: nowrap;
  }

  .header-menu-toggle {
    display: inline-flex;
  }

  .header-nav {
    position: absolute;
    inset-block-start: calc(100% + 1px);
    inset-inline-end: 16px;
    inset-inline-start: auto;
    width: min(360px, calc(100vw - 32px));
    max-height: calc(100vh - 80px);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px;
    overflow-y: auto;
    overscroll-behavior: contain;
    background: var(--modal-bg);
    border: 1px solid var(--rule);
    box-shadow: var(--shadow-hard);
  }

  .header-nav[hidden] {
    display: none;
  }

  .header-nav a,
  .header-nav .header-github {
    display: flex;
    align-items: center;
    width: 100%;
    min-height: 44px;
    padding: 9px 12px;
  }

  .header-nav a + a {
    border-top: 1px solid var(--rule-soft);
  }

  .header-nav a[aria-current="page"] {
    background: var(--blueprint-tint);
  }

  .header-mobile-only {
    display: flex;
  }

  .header-mobile-tools {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
    padding: 8px 4px 4px;
    border-top: 1px solid var(--rule-soft);
  }

  .header-mobile-tools .search-toggle,
  .header-mobile-tools .theme-toggle,
  .header-mobile-tools .tts-toggle {
    width: 44px;
    height: 44px;
    flex: 0 0 44px;
  }

  .header-mobile-tools .lang-picker-btn {
    min-width: 44px;
    min-height: 44px;
  }

  .header-mobile-tools .lang-item {
    min-height: 44px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 56px;
    padding: 0 12px;
    gap: 8px;
  }

  .logo {
    font-size: 1.2rem;
    gap: 6px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-shrink: 1;
    min-width: 0;
  }

  .header-nav {
    inset-inline-end: 12px;
    gap: 0;
  }

  .header-github {
    padding: 4px 8px;
    font-size: 0.7rem;
    gap: 4px;
  }

  .theme-toggle {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
  }

  .container {
    padding: 0 16px;
  }

  .section {
    padding: 48px 0;
  }

  .btn {
    width: 100%;
    max-width: 320px;
  }

  .modal {
    max-width: 100%;
  }

  .modal-lesson {
    gap: 8px;
  }

  .modal-lesson-open {
    gap: 14px;
  }

  .modal-lesson-cta {
    font-size: 0.62rem;
  }

  .modal-lesson-toggle {
    min-width: 96px;
    margin-right: 8px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
    gap: 16px;
  }

  .footer-inner p,
  .footer-links {
    width: 100%;
    min-width: 0;
  }

  .footer-inner p {
    overflow-wrap: anywhere;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px 20px;
  }
}

@media (max-width: 600px) {
  .header-inner {
    height: 56px;
    padding: 0 14px;
    justify-content: flex-start;
    gap: 8px;
  }

  .logo {
    max-width: calc(100vw - 82px);
    font-size: 1.05rem;
    line-height: 1;
  }

  .header-github {
    display: flex;
  }

  .header-nav {
    inset-inline-end: 10px;
    margin-inline-start: 0;
    gap: 0;
  }

  .theme-toggle {
    width: 44px;
    height: 44px;
  }

  .modal-overlay {
    align-items: stretch;
    justify-content: flex-end;
    padding: 56px 0 0;
  }

  .modal {
    max-width: 100%;
    max-height: calc(100vh - 56px);
    height: calc(100vh - 56px);
    border-left: none;
    border-right: none;
    box-shadow: none;
  }

  .modal-close {
    top: 16px;
    right: 16px;
    min-width: 44px;
    min-height: 36px;
  }

  .modal-close::before {
    content: none;
  }

  .modal-header {
    padding: 20px 70px 16px 18px;
  }

  .modal-title {
    font-size: 2rem;
    line-height: 0.98;
  }

  .modal-desc {
    font-size: 0.96rem;
    line-height: 1.5;
  }

  .modal-lessons {
    gap: 0;
    padding: 6px 10px;
  }

  .modal-lesson {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 6px;
    background: transparent;
  }

  .modal-lesson:last-child {
    border-bottom: none;
  }

  .modal-lesson-open {
    min-height: 76px;
    gap: 12px;
    padding: 12px 8px;
  }

  .modal-lesson-name {
    white-space: normal;
    overflow: visible;
    text-overflow: clip;
    font-size: 0.96rem;
  }

  .modal-lesson-cta {
    min-width: 54px;
    justify-content: flex-end;
    text-align: right;
  }

  .modal-lesson-toggle {
    min-width: 38px;
    min-height: 38px;
    margin-right: 4px;
    padding: 0;
    justify-content: center;
  }

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

  .modal-footer {
    padding: 12px 18px 14px;
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 16px;
  }

  .header-inner {
    padding: 0 10px;
    gap: 6px;
  }

  .logo {
    font-size: 1rem;
    letter-spacing: 0.02em;
  }

  .logo-icon {
    width: 10px;
    height: 10px;
  }

  .header-github {
    padding: 3px 6px;
    font-size: 0.65rem;
  }

  .header-github .star-count {
    font-size: 0.7rem;
  }

  .theme-toggle {
    width: 44px;
    height: 44px;
    font-size: 0.85rem;
  }
}

@media (min-width: 1440px) {
  .container {
    max-width: 1240px;
  }
}

/* ═══════════════════════════════════════════════════════════════════════
   Command Palette  —  global search  (Cmd/Ctrl+K or search button)
   ═══════════════════════════════════════════════════════════════════════ */

/* ── Search trigger button in the header ─────────────────────────────── */
.search-toggle {
  background: transparent;
  border: 1px solid var(--rule-soft);
  width: 36px;
  height: 36px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-soft);
  transition: border-color 0.15s, color 0.15s;
  flex-shrink: 0;
}

.search-toggle:hover {
  border-color: var(--blueprint);
  color: var(--blueprint);
}

/* ── Palette overlay wrapper ─────────────────────────────────────────── */
#cmdPalette {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  /* push the panel below the fixed header on any viewport */
  padding: clamp(68px, 13vh, 150px) 16px 16px;
  pointer-events: none; /* clicks pass through until open */
}

#cmdPalette.cp-open {
  pointer-events: auto;
}

/* ── Dimmed backdrop ─────────────────────────────────────────────────── */
.cp-backdrop {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  opacity: 0;
  transition: none;
}

#cmdPalette.cp-open .cp-backdrop {
  opacity: 1;
}

/* ── Panel ───────────────────────────────────────────────────────────── */
.cp-panel {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 640px;
  max-height: 70vh;
  display: flex;
  flex-direction: column;
  background: var(--modal-bg);
  border: 2px solid var(--ink);
  box-shadow: 6px 6px 0 var(--ink);
  overflow: hidden;
  opacity: 0;
  transform: none;
  transition: none;
}

#cmdPalette.cp-open .cp-panel {
  opacity: 1;
  transform: translateY(0);
}

/* ── Search row ──────────────────────────────────────────────────────── */
.cp-search-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--rule-soft);
  flex-shrink: 0;
}

.cp-search-icon {
  color: var(--ink-mute);
  flex-shrink: 0;
}

.cp-input {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--ink);
  background: transparent;
  border: none;
  outline: none;
  min-width: 0;
  caret-color: var(--blueprint);
}

.cp-input::placeholder {
  color: var(--ink-mute);
}

/* Strip browser chrome from <input type="search"> */
.cp-input[type="search"]::-webkit-search-decoration,
.cp-input[type="search"]::-webkit-search-cancel-button,
.cp-input[type="search"]::-webkit-search-results-button,
.cp-input[type="search"]::-webkit-search-results-decoration {
  display: none;
}

.cp-kbd-esc {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--ink-mute);
  background: var(--bg-surface);
  border: 1px solid var(--rule-soft);
  padding: 4px 8px;
  line-height: 1;
  letter-spacing: 0.04em;
  flex-shrink: 0;
  cursor: pointer;
  user-select: none;
}

.cp-kbd-esc:hover {
  color: var(--blueprint);
  border-color: var(--blueprint);
}

.cp-kbd-esc:focus-visible {
  outline: 2px solid var(--blueprint);
  outline-offset: 2px;
}

/* ── Results list ────────────────────────────────────────────────────── */
.cp-results {
  list-style: none;
  overflow-y: auto;
  flex: 1;
  min-height: 0;
  overscroll-behavior: contain;
}

/* ── Global themed scrollbar ─────────────────────────────────────────────
   One base rule themes every scrollable surface — the page, code blocks, the
   lesson body, the language list, tables, modals — in both light and dark, so
   no component has to restyle its scrollbar. More specific rules below (e.g.
   .cp-results) still override this baseline. */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--rule-soft) transparent;
}
*::-webkit-scrollbar        { width: 10px; height: 10px; }
*::-webkit-scrollbar-track  { background: transparent; }
*::-webkit-scrollbar-thumb  {
  background: var(--rule-soft);
  border-radius: 6px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
/* background-color, not the shorthand, so the padding-box inset is kept on hover */
*::-webkit-scrollbar-thumb:hover { background-color: var(--ink-mute); }

.cp-results::-webkit-scrollbar       { width: 4px; }
/* border:0 + border-box so the global 2px inset does not eat the narrow 4px thumb */
.cp-results::-webkit-scrollbar-thumb { background: var(--rule-soft); border-radius: 2px; border: 0; background-clip: border-box; }

/* ── Empty / no-match state ──────────────────────────────────────────── */
.cp-empty {
  display: block;
  padding: 24px 20px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-mute);
  text-align: center;
}

.cp-empty em {
  font-style: normal;
  color: var(--ink-soft);
}

/* ── Result item ─────────────────────────────────────────────────────── */
.cp-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  cursor: pointer;
  border-inline-start: 3px solid transparent;
  list-style: none;
  transition: none;
}

.cp-item + .cp-item {
  border-top: 1px solid var(--rule-soft);
}

.cp-item:hover,
.cp-item--active {
  background: var(--blueprint-tint);
  border-inline-start-color: var(--blueprint);
}

.cp-item-body {
  display: grid;
  /* chip / name / summary / meta — all rows auto-height */
  grid-template-rows: auto auto auto auto;
  gap: 1px;
  flex: 1;
  min-width: 0;
}

/* Phase / Glossary chip */
.cp-item-chip {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blueprint);
  line-height: 1.2;
}

.cp-item-chip--alt {
  color: var(--ink-mute);
}

/* Lesson / term name */
.cp-item-name {
  font-family: var(--font-body);
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.35;
}

/* One-line summary */
.cp-item-summary {
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--ink-soft);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.3;
}

/* Type · Language meta line */
.cp-item-meta {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
  line-height: 1.3;
}

/* Chevron arrow — appears only on hover / active */
.cp-item-arrow {
  color: var(--ink-mute);
  flex-shrink: 0;
  opacity: 0;
  transition: none;
}

.cp-item:hover .cp-item-arrow,
.cp-item--active .cp-item-arrow {
  opacity: 1;
  color: var(--blueprint);
}

/* Highlighted match inside results */
.cp-results mark {
  background: var(--blueprint-tint-strong);
  color: var(--blueprint);
  padding: 0 1px;
  font-style: normal;
  border-radius: 2px;
}

/* ── Footer keyboard hints ───────────────────────────────────────────── */
.cp-footer {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  padding: 7px 16px;
  border-top: 1px solid var(--rule-soft);
  flex-shrink: 0;
}

.cp-footer-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

.cp-footer kbd {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--ink-mute);
  background: var(--bg-surface);
  border: 1px solid var(--rule-soft);
  padding: 1px 5px;
  letter-spacing: 0.02em;
  user-select: none;
}

.cp-footer-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--ink-mute);
  letter-spacing: 0.04em;
}

.cp-footer-shortcut {
  margin-inline-start: auto;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--ink-mute);
  letter-spacing: 0.06em;
}

/* ── Scroll lock when palette is open ───────────────────────────────── */
body[data-palette-open] {
  overflow: hidden;
}

/* ── Reduced motion ──────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .cp-backdrop,
  .cp-panel {
    transition: none !important;
  }
}

/* ── Mobile: full-width sheet pinned to top ──────────────────────────── */
@media (max-width: 600px) {
  #cmdPalette {
    padding: 56px 0 0; /* clear the 56px mobile header */
    align-items: flex-start;
  }

  .cp-panel {
    max-width: 100%;
    max-height: calc(85vh - 56px);
    border-left: none;
    border-right: none;
    border-top: 2px solid var(--ink);
    box-shadow: none;
  }

  .search-toggle {
    width: 44px;
    height: 44px;
  }

  /* Keep only the "navigate" hint on small screens */
  .cp-footer-group:not(:first-child),
  .cp-footer-shortcut {
    display: none;
  }
}

/* ── language picker (reference-manual aesthetic) ───────────────────── */
.lang-picker { position: relative; display: inline-flex; }
.lang-picker-btn {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.04em;
  color: var(--ink-soft); background: transparent;
  border: 1px solid var(--rule-soft); padding: 6px 10px; cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.lang-picker-btn:hover { color: var(--blueprint); border-color: var(--blueprint); }
.lang-picker-btn:active { transform: scale(0.98); }
.lang-glyph {
  font-weight: 700; color: var(--blueprint); font-size: 0.7rem; letter-spacing: 0;
}
.lang-current { max-width: 12ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lang-caret { font-size: 0.6rem; color: var(--ink-mute); }

.lang-panel {
  position: absolute; top: calc(100% + 8px); inset-inline-end: 0; z-index: 60;
  width: 232px; background: var(--bg); border: 1px solid var(--blueprint);
  box-shadow: 0 14px 40px rgba(26, 26, 26, 0.18);
  display: flex; flex-direction: column; overflow: hidden;
}
.lang-panel[hidden] { display: none; }
.lang-panel-head {
  font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.18em;
  color: var(--blueprint); padding: 10px 12px 6px; border-bottom: 1px solid var(--rule-soft);
}
.lang-filter {
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink);
  background: var(--code-bg); border: none; border-bottom: 1px solid var(--rule-soft);
  padding: 8px 12px; outline: none;
}
.lang-filter:focus { background: var(--blueprint-tint); }
.lang-list { max-height: 300px; overflow-y: auto; }
.lang-item {
  display: flex; align-items: baseline; gap: 8px; width: 100%;
  font-family: var(--font-body, Georgia, serif); font-size: 0.9rem; text-align: start;
  color: var(--ink); background: transparent; border: none; cursor: pointer;
  padding: 8px 12px; transition: background 0.12s ease, color 0.12s ease;
}
.lang-item:hover { background: var(--blueprint-tint); color: var(--blueprint); }
.lang-item:focus-visible { outline: 2px solid var(--blueprint); outline-offset: -2px; }
.lang-item.is-current { color: var(--blueprint); }
.lang-tick { width: 10px; color: var(--blueprint); font-size: 0.9rem; flex-shrink: 0; }
.lang-native { flex: 1; }
.lang-code {
  font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.06em;
  color: var(--ink-mute); text-transform: uppercase;
}
@media (prefers-reduced-motion: reduce) {
  .lang-picker-btn, .lang-item { transition: none; }
  .lang-picker-btn:active { transform: none; }
}

/* ============================================================
   READ ALOUD (SpeechSynthesis)
   ============================================================ */

.tts-toggle .tts-wave-1,
.tts-toggle .tts-wave-2 {
  opacity: 0.55;
}

.tts-toggle.is-active {
  border-color: var(--blueprint);
  color: var(--blueprint);
}

.tts-toggle:disabled {
  cursor: not-allowed;
  color: var(--ink-mute);
  opacity: 0.52;
}

.tts-toggle.is-active .tts-wave-1 {
  animation: tts-wave 1.4s ease-in-out infinite;
}

.tts-toggle.is-active .tts-wave-2 {
  animation: tts-wave 1.4s ease-in-out 0.25s infinite;
}

@keyframes tts-wave {
  0%, 100% { opacity: 0.2; }
  50% { opacity: 1; }
}

.tts-reading {
  background: var(--blueprint-tint);
  box-shadow: -10px 0 0 var(--blueprint-tint), inset 3px 0 0 var(--blueprint);
  border-radius: 1px;
  transition: background 0.2s;
}

.tts-bar {
  position: fixed;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%) translateY(8px);
  z-index: 900;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  max-width: calc(100vw - 24px);
  flex-wrap: wrap;
  justify-content: center;
  background: var(--bg-surface);
  border: 1px solid var(--ink);
  box-shadow: var(--shadow-hard);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s, transform 0.15s;
}

.tts-bar.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

/* display:flex would override the UA [hidden] rule, leaving the controls
   focusable and the live region announced while the bar is invisible. */
.tts-bar[hidden] {
  display: none;
}

.tts-btn {
  background: transparent;
  border: 1px solid var(--rule-soft);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1;
  padding: 6px 9px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

.tts-btn:hover {
  border-color: var(--blueprint);
  color: var(--blueprint);
}

.tts-btn:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.tts-btn-main {
  min-width: 38px;
  border-color: var(--ink);
}

.tts-btn-stop {
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.68rem;
  padding: 7px 10px;
}

.tts-btn-reset {
  color: var(--ink-mute);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.tts-status {
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  min-width: 16ch;
  max-width: min(44vw, 420px);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tts-progress {
  width: 86px;
  height: 4px;
  overflow: hidden;
  border: 0;
  background: var(--rule-soft);
  color: var(--blueprint);
}

.tts-progress::-webkit-progress-bar {
  background: var(--rule-soft);
}

.tts-progress::-webkit-progress-value {
  background: var(--blueprint);
}

.tts-progress::-moz-progress-bar {
  background: var(--blueprint);
}

.tts-field {
  display: flex;
  align-items: center;
  gap: 5px;
  color: var(--text-muted);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.tts-select {
  background: var(--bg);
  color: var(--ink);
  border: 1px solid var(--rule-soft);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 4px 6px;
  max-width: 150px;
  cursor: pointer;
}

.tts-select:focus-visible,
.tts-btn:focus-visible {
  outline: 2px solid var(--blueprint);
  outline-offset: 1px;
}

@media (max-width: 720px) {
  body.tts-active {
    padding-bottom: calc(var(--tts-bar-height, 112px) + 28px + env(safe-area-inset-bottom));
  }

  .tts-bar {
    left: 12px;
    right: 12px;
    bottom: max(12px, env(safe-area-inset-bottom));
    transform: none;
    max-width: none;
    gap: 8px;
    touch-action: auto;
  }

  .tts-bar.is-visible {
    transform: none;
  }

  .tts-status {
    order: -2;
    width: calc(100% - 102px);
    max-width: none;
  }

  .tts-progress {
    order: -1;
    width: 86px;
  }

  .tts-field-voice {
    display: flex;
    max-width: calc(100% - 110px);
  }

  .tts-field-voice .tts-select {
    min-width: 0;
    max-width: 180px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .tts-toggle.is-active .tts-wave-1,
  .tts-toggle.is-active .tts-wave-2 {
    animation: none;
    opacity: 1;
  }
}

.quiz-option.tts-reading {
  box-shadow: inset 3px 0 0 var(--blueprint);
}

.tts-from-here {
  position: absolute;
  z-index: 950;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  background: var(--ink);
  color: var(--bg);
  border: 1px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 2px 2px 0 var(--blueprint);
  white-space: nowrap;
}

.tts-from-here:hover {
  background: var(--blueprint);
  border-color: var(--blueprint);
  color: #fff;
}

.tts-from-here[hidden] {
  display: none;
}

@media (max-width: 600px) {
  .tts-from-here {
    font-size: 0.66rem;
    padding: 7px 10px;
  }
}

/* --- floating: drag anywhere over the article --- */

.tts-bar {
  cursor: grab;
  touch-action: none;
}

.tts-bar.is-dragging {
  cursor: grabbing;
  user-select: none;
  transition: none;
}

/* Once dragged, the bar is pinned to explicit coordinates instead of the
   default bottom-centre anchoring. */
.tts-bar.is-placed,
.tts-bar.is-placed.is-visible {
  bottom: auto;
  transform: none;
}

.tts-bar .tts-btn,
.tts-bar .tts-select {
  cursor: pointer;
}

.tts-btn-collapse {
  border-color: var(--rule-soft);
  font-size: 0.72rem;
  line-height: 1;
  padding: 6px 8px;
}

/* --- collapsed: a single speaker puck --- */

.tts-bar.is-collapsed {
  padding: 0;
  gap: 0;
  flex-wrap: nowrap;
}

.tts-bar.is-collapsed > *:not(.tts-btn-collapse) {
  display: none;
}

.tts-bar.is-collapsed .tts-btn-collapse {
  width: 42px;
  height: 42px;
  padding: 0;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tts-bar.is-collapsed .tts-btn-collapse:hover {
  color: var(--blueprint);
}

.tts-bar.is-reading .tts-btn-collapse .tts-wave-1 {
  animation: tts-wave 1.4s ease-in-out infinite;
}

.tts-bar.is-reading .tts-btn-collapse .tts-wave-2 {
  animation: tts-wave 1.4s ease-in-out 0.25s infinite;
}

@media (max-width: 720px) {
  /* The mobile rules stretch the bar edge to edge; a puck must not stretch. */
  .tts-bar.is-collapsed {
    left: auto;
    right: 12px;
    width: 42px;
  }

  .tts-bar.is-placed.is-collapsed {
    right: auto;
  }

  .tts-bar:not(.is-collapsed) .tts-btn-reset {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .tts-bar.is-reading .tts-btn-collapse .tts-wave-1,
  .tts-bar.is-reading .tts-btn-collapse .tts-wave-2 {
    animation: none;
    opacity: 1;
  }
}

/* --- compact header tools keep the language label in the accessibility tree. --- */

@media (max-width: 600px) {
  .lang-current {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .lang-picker-btn {
    gap: 4px;
    padding: 6px 8px;
  }

  .tts-toggle {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
  }

  .search-toggle {
    flex-shrink: 0;
  }
}