/* ------------------------------------------------------------------ temas */

:root {
  color-scheme: light;
  --bg: #f4f6fb;
  --bg-glow: rgba(37, 99, 235, 0.10);
  --panel: #ffffff;
  --panel-2: #f3f6fd;
  --text: #141d31;
  --text-2: #45526e;
  --muted: #6b7790;
  --line: #e2e8f4;
  --line-strong: #cfd9ec;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --accent-soft: #e9efff;
  --accent-border: #c4d5fb;
  --meter-track: #d9e4fc;

  --good: #0ca30c;
  --good-ink: #0f6c2f;
  --good-soft: #e9f8ee;
  --good-border: #b9e5c9;
  --note-ink: #7a4d07;
  --note-soft: #fdf5e3;
  --note-border: #f1d99b;
  --task-ink: #1c3f7d;
  --task-soft: #ecf3ff;
  --task-border: #c3d7fb;
  --danger: #d03b3b;
  --hero-a: #17233e;
  --hero-b: #27498b;
  --code-bg: #0e1526;
  --code-line: #1d2a45;
  --code-text: #d9e3f5;
  --code-muted: #93a3bf;
  --mark-bg: #fde68a;
  --mark-ink: #4d3a05;
  --shadow: 0 14px 40px rgba(23, 35, 62, 0.10);
  --shadow-soft: 0 6px 22px rgba(23, 35, 62, 0.07);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b1120;
  --bg-glow: rgba(84, 129, 255, 0.10);
  --panel: #121a2d;
  --panel-2: #172137;
  --text: #e7edf9;
  --text-2: #b6c2da;
  --muted: #8896b2;
  --line: #232f4a;
  --line-strong: #2e3c5c;
  --accent: #5b8cff;
  --accent-strong: #7fa5ff;
  --accent-soft: #1a2745;
  --accent-border: #33477a;
  --meter-track: #23345c;
  --good: #34c26b;
  --good-ink: #7fdba4;
  --good-soft: #122b22;
  --good-border: #1f4a35;
  --note-ink: #ecc067;
  --note-soft: #2a2214;
  --note-border: #514019;
  --task-ink: #9dbdf5;
  --task-soft: #16233e;
  --task-border: #2c4370;
  --danger: #ff7d7d;
  --hero-a: #101b33;
  --hero-b: #1e3a6e;
  --code-bg: #0a101f;
  --code-line: #1b2740;
  --code-text: #d9e3f5;
  --code-muted: #8194b4;
  --mark-bg: #8a6d1d;
  --mark-ink: #fff4cf;
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.45);
  --shadow-soft: 0 6px 22px rgba(0, 0, 0, 0.35);
}

/* ------------------------------------------------------------------- base */

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% -4%, var(--bg-glow), transparent 30rem),
    var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  transition: background-color 200ms ease, color 200ms ease;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

::selection {
  background: var(--accent);
  color: white;
}

mark {
  padding: 0.05rem 0.18rem;
  border-radius: 4px;
  background: var(--mark-bg);
  color: var(--mark-ink);
}

.app-shell {
  display: grid;
  grid-template-columns: 20.5rem minmax(0, 1fr);
  min-height: 100vh;
}

/* ---------------------------------------------------------------- sidebar */

.sidebar {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow-y: auto;
  padding: 1.3rem 1.1rem 1rem;
  background: var(--panel);
  border-right: 1px solid var(--line);
  overflow-x: hidden;
  scrollbar-width: thin;
  z-index: 30;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1.35rem;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--hero-a), var(--hero-b));
  color: #fff;
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: 0.03em;
  box-shadow: var(--shadow-soft);
}

.eyebrow {
  margin: 0 0 0.18rem;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

h1 {
  margin: 0;
  font-size: 1.3rem;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

h1, h2, h3, p {
  overflow-wrap: anywhere;
}

.search {
  display: grid;
  gap: 0.4rem;
  margin-bottom: 1.15rem;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.search input {
  width: 100%;
  padding: 0.66rem 0.75rem;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--panel);
  color: var(--text);
  outline: none;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

.search input::placeholder {
  color: var(--muted);
  opacity: 0.75;
}

.search input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

.module-nav {
  display: grid;
  gap: 0.55rem;
  align-content: start;
}

.nav-module {
  border: 1px solid transparent;
  border-radius: 12px;
  transition: border-color 150ms ease, background-color 150ms ease;
}

.nav-module.active {
  border-color: var(--accent-border);
  background: var(--accent-soft);
}

.nav-item {
  display: grid;
  gap: 0.35rem;
  width: 100%;
  padding: 0.7rem 0.75rem 0.65rem;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: var(--text);
  text-align: left;
}

.nav-module:not(.active) .nav-item:hover {
  background: var(--panel-2);
}

.nav-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
}

.nav-code {
  color: var(--accent-strong);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.nav-count {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.nav-count.complete {
  color: var(--good-ink);
}

.nav-title {
  color: var(--text-2);
  font-size: 0.83rem;
  font-weight: 600;
  line-height: 1.3;
}

/* meter: relleno acento sobre pista del mismo tono, más clara */
.meter {
  display: block;
  height: 7px;
  border-radius: 999px;
  background: var(--meter-track);
  overflow: hidden;
}

.meter-small {
  height: 4px;
}

.meter-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--accent);
  transition: width 350ms ease;
}

.toc {
  margin: 0.1rem 0 0.45rem;
  padding: 0 0.45rem 0.35rem;
  list-style: none;
  display: grid;
  gap: 1px;
}

.toc-link {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  min-width: 0;
  padding: 0.34rem 0.5rem;
  border-radius: 8px;
  color: var(--text-2);
  font-size: 0.8rem;
  line-height: 1.25;
  text-decoration: none;
}

.toc-link.lvl-2 {
  margin-left: 0.95rem;
  font-size: 0.77rem;
  color: var(--muted);
}

.toc-link:hover {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--text);
}

.toc-link.active {
  background: var(--accent);
  color: #fff;
}

.toc-link.active .toc-mark {
  color: #fff;
}

.toc-mark {
  flex: 0 0 0.85rem;
  display: inline-flex;
  color: var(--good-ink);
}

.toc-link.done:not(.active) {
  color: var(--muted);
}

.toc-text {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nav-title {
  overflow-wrap: anywhere;
}


.scrim {
  display: none;
}

/* ---------------------------------------------------------------- topbar */

.content {
  min-width: 0;
  padding: 1.35rem clamp(1rem, 3.5vw, 3rem) 4.5rem;
}

.topbar {
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: -1.35rem calc(clamp(1rem, 3.5vw, 3rem) * -1) 1.4rem;
  padding: 0.85rem clamp(1rem, 3.5vw, 3rem);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  z-index: 20;
}

.topbar-title {
  min-width: 0;
  flex: 1;
}

.topbar h2 {
  margin: 0;
  font-size: clamp(1.05rem, 1.7vw, 1.35rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.icon-button,
.small-button {
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  background: var(--panel);
  color: var(--text-2);
  transition: border-color 150ms ease, background-color 150ms ease, color 150ms ease;
}

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 2.3rem;
  height: 2.3rem;
}

#menuButton {
  display: none;
}

.small-button {
  min-height: 2.3rem;
  padding: 0 0.8rem;
  font-size: 0.85rem;
  font-weight: 700;
}

.icon-button:hover,
.small-button:hover {
  border-color: var(--accent-border);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.continue-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  min-height: 2.3rem;
  padding: 0 0.85rem;
  border: 1px solid var(--accent-border);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.83rem;
  font-weight: 600;
}

.continue-chip:hover {
  background: color-mix(in srgb, var(--accent) 16%, var(--panel));
}

.chip-play {
  font-size: 0.62rem;
}

/* --------------------------------------------------------------- overview */

.overview {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.85rem;
  margin-bottom: 1.35rem;
}

.stat-card {
  display: grid;
  gap: 0.3rem;
  align-content: start;
  padding: 1rem 1.05rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--shadow-soft);
}

.stat-label {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
}

.stat-value {
  font-size: 1.65rem;
  font-weight: 650;
  line-height: 1.05;
  letter-spacing: -0.01em;
}

.stat-progress .meter {
  margin: 0.25rem 0 0.1rem;
}

.stat-foot {
  color: var(--muted);
  font-size: 0.76rem;
}

/* --------------------------------------------------------------- búsqueda */

.search-state {
  margin-bottom: 1rem;
  padding: 0.8rem 1rem;
  border: 1px solid var(--accent-border);
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.9rem;
  font-weight: 600;
}

.search-results {
  display: grid;
  gap: 0.45rem;
}

.results-module {
  margin: 0.9rem 0 0.2rem;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.results-module:first-child {
  margin-top: 0;
}

.result {
  display: grid;
  gap: 0.3rem;
  width: 100%;
  padding: 0.8rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  color: var(--text);
  text-align: left;
  transition: border-color 150ms ease, transform 150ms ease;
}

.result:hover {
  border-color: var(--accent-border);
  transform: translateY(-1px);
  box-shadow: var(--shadow-soft);
}

.result-title {
  font-size: 0.9rem;
  font-weight: 700;
}

.result-snippet {
  color: var(--text-2);
  font-size: 0.84rem;
  line-height: 1.5;
}

/* ----------------------------------------------------------------- módulo */

.course-content {
  display: grid;
  gap: 1rem;
}

.module-hero {
  padding: 1.5rem 1.6rem 1.4rem;
  border-radius: 16px;
  background:
    radial-gradient(circle at 88% 0%, rgba(255, 255, 255, 0.14), transparent 22rem),
    linear-gradient(135deg, var(--hero-a), var(--hero-b));
  color: #fff;
  box-shadow: var(--shadow);
}

.hero-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.85rem;
}

.module-chip {
  display: inline-flex;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.25);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.hero-meter {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-width: 0;
}

.hero-meter .meter {
  width: clamp(5rem, 18vw, 11rem);
  background: rgba(255, 255, 255, 0.22);
}

.hero-meter .meter-fill {
  background: #fff;
}

.hero-meter-label {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.78rem;
  font-weight: 600;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.module-hero h2 {
  margin: 0;
  font-size: clamp(1.25rem, 2.4vw, 1.8rem);
  line-height: 1.22;
  letter-spacing: 0.01em;
}

.module-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 1rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  min-height: 1.85rem;
  padding: 0.26rem 0.6rem;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.10);
  color: #eaf1ff;
  font-size: 0.76rem;
  font-weight: 600;
}

.pill-key {
  color: rgba(255, 255, 255, 0.66);
  font-size: 0.66rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.module-body {
  display: grid;
  gap: 0.8rem;
  margin-top: 1rem;
}

/* --------------------------------------------------------------- sección */

.group-heading {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin: 1.15rem 0 0.15rem;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  scroll-margin-top: 92px;
  border-radius: 8px;
}

.group-heading::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line-strong);
}

.group-heading.flash {
  color: var(--accent-strong);
}

.toc-link.toc-group {
  font-weight: 800;
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.section-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  scroll-margin-top: 92px;
  transition: border-color 200ms ease, box-shadow 200ms ease;
}

.section-card.lvl-2 {
  margin-left: 1.4rem;
}

.section-card.done {
  border-color: var(--good-border);
}

.section-card.flash {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 22%, transparent);
}

.section-card summary {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.85rem 1rem;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.section-card summary::-webkit-details-marker {
  display: none;
}

.sec-caret {
  flex: 0 0 auto;
  width: 0.5rem;
  height: 0.5rem;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(-45deg);
  transition: transform 160ms ease;
}

.section-card[open] > summary .sec-caret {
  transform: rotate(45deg);
}

.sec-title {
  flex: 1;
  min-width: 0;
  font-size: 0.92rem;
  font-weight: 750;
  letter-spacing: 0.015em;
  line-height: 1.3;
}

.section-card.lvl-2 .sec-title {
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--text-2);
}

.section-card.done .sec-title {
  color: var(--muted);
}

.sec-badges {
  display: inline-flex;
  gap: 0.35rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.badge-quiz {
  background: var(--accent-soft);
  border: 1px solid var(--accent-border);
  color: var(--accent-strong);
}

.badge-lab {
  background: var(--note-soft);
  border: 1px solid var(--note-border);
  color: var(--note-ink);
}

.done-toggle {
  flex: 0 0 auto;
  display: inline-grid;
  place-items: center;
  width: 1.8rem;
  height: 1.8rem;
  border: 1.5px solid var(--line-strong);
  border-radius: 999px;
  background: var(--panel);
  color: transparent;
  transition: border-color 150ms ease, background-color 150ms ease, color 150ms ease;
}

.done-toggle:hover {
  border-color: var(--good);
  color: var(--good);
}

.done-toggle.on {
  border-color: var(--good);
  background: var(--good);
  color: #fff;
}

.section-body {
  display: grid;
  gap: 0.75rem;
  padding: 0.15rem 1.05rem 1.1rem;
}

/* ----------------------------------------------------------------- texto */

.text-block {
  max-width: 76ch;
}

.text-block p,
.callout-body p {
  margin: 0 0 0.55rem;
  color: var(--text-2);
  font-size: 0.94rem;
  line-height: 1.68;
}

.text-block p:last-child,
.callout-body p:last-child {
  margin-bottom: 0;
}

.keep-lines {
  white-space: pre-wrap;
}

.ascii-art {
  margin: 0;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel-2);
  color: var(--text-2);
  font-family: ui-monospace, "JetBrains Mono", SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  line-height: 1.42;
  overflow-x: auto;
}

.callout {
  display: flex;
  gap: 0.75rem;
  max-width: 80ch;
  padding: 0.85rem 1rem;
  border: 1px solid;
  border-radius: 12px;
}

.callout-icon {
  flex: 0 0 auto;
  font-size: 1rem;
  line-height: 1.5;
}

.callout-body {
  min-width: 0;
}

.callout-body p:first-child {
  font-weight: 700;
}

.callout-note {
  border-color: var(--note-border);
  background: var(--note-soft);
}

.callout-note .callout-body p {
  color: var(--note-ink);
}

.callout-task {
  border-color: var(--task-border);
  background: var(--task-soft);
}

.callout-task .callout-body p {
  color: var(--task-ink);
}

.callout-success {
  border-color: var(--good-border);
  background: var(--good-soft);
}

.callout-success .callout-body p {
  color: var(--good-ink);
}

/* ----------------------------------------------------------------- código */

.code-panel {
  max-width: 86ch;
  border-radius: 12px;
  background: var(--code-bg);
  border: 1px solid var(--code-line);
  overflow: hidden;
}

.code-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.45rem 0.5rem 0.45rem 0.85rem;
  border-bottom: 1px solid var(--code-line);
  color: var(--code-muted);
}

.code-lang {
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.09em;
}

.copy-button {
  min-height: 1.75rem;
  padding: 0 0.6rem;
  border: 1px solid var(--code-line);
  border-radius: 7px;
  background: transparent;
  color: var(--code-text);
  font-size: 0.73rem;
  font-weight: 700;
  transition: background-color 150ms ease, border-color 150ms ease;
}

.copy-button:hover {
  background: rgba(255, 255, 255, 0.08);
}

.copy-button.copied {
  border-color: var(--good);
  color: #7fdba4;
}

pre {
  margin: 0;
  padding: 0.9rem 1rem;
  overflow-x: auto;
}

code {
  color: var(--code-text);
  font-family: ui-monospace, "JetBrains Mono", SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
  line-height: 1.6;
  white-space: pre;
}

.text-block code,
.empty code {
  padding: 0.08rem 0.3rem;
  border-radius: 5px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--text);
  font-size: 0.84em;
  white-space: normal;
}

/* tokens de sintaxis (el panel de código es oscuro en ambos temas) */
.tok-cmd { color: #7cc7ff; font-weight: 600; }
.tok-flag { color: #c9b8fd; }
.tok-str { color: #94e2b4; }
.tok-comment { color: #7c8ca6; font-style: italic; }
.tok-key { color: #8fc1ff; }
.tok-var { color: #ffd37c; }
.tok-ph { color: #f2a8cb; font-style: italic; }

/* ------------------------------------------------------------------- quiz */

.quiz-card {
  max-width: 80ch;
  padding: 1rem 1.1rem;
  border: 1px solid var(--accent-border);
  border-left: 4px solid var(--accent);
  border-radius: 12px;
  background: color-mix(in srgb, var(--accent-soft) 55%, var(--panel));
}

.quiz-head {
  margin-bottom: 0.5rem;
}

.quiz-num {
  display: inline-flex;
  padding: 0.18rem 0.6rem;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.quiz-question p {
  color: var(--text);
  font-weight: 600;
}

.quiz-toggle {
  margin-top: 0.65rem;
  min-height: 2.1rem;
  padding: 0 0.9rem;
  border: 1px solid var(--accent-border);
  border-radius: 999px;
  background: var(--panel);
  color: var(--accent-strong);
  font-size: 0.8rem;
  font-weight: 700;
  transition: background-color 150ms ease;
}

.quiz-toggle:hover {
  background: var(--accent-soft);
}

.quiz-toggle .when-open {
  display: none;
}

.quiz-card.open .quiz-toggle .when-closed {
  display: none;
}

.quiz-card.open .quiz-toggle .when-open {
  display: inline;
}

.quiz-answer {
  display: none;
}

.quiz-card.open .quiz-answer {
  display: grid;
  gap: 0.7rem;
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px dashed var(--accent-border);
  animation: rise 220ms ease;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------------------------------------------------------------- spoiler */

.spoiler {
  position: relative;
  max-width: 86ch;
  padding: 0.85rem;
  border: 1px dashed var(--line-strong);
  border-radius: 14px;
}

.spoiler-content {
  display: grid;
  gap: 0.7rem;
}

.spoiler:not(.open) .spoiler-content {
  max-height: 19rem;
  overflow: hidden;
  filter: blur(7px);
  opacity: 0.65;
  pointer-events: none;
  user-select: none;
}

.spoiler-cover {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: grid;
  place-content: center;
  gap: 0.75rem;
  padding: 1rem;
  text-align: center;
  border-radius: 14px;
  background: color-mix(in srgb, var(--panel) 42%, transparent);
}

.spoiler.open .spoiler-cover {
  display: none;
}

.spoiler-label {
  margin: 0;
  color: var(--text-2);
  font-size: 0.88rem;
  font-weight: 700;
}

.reveal-button {
  justify-self: center;
  min-height: 2.3rem;
  padding: 0 1.1rem;
  border: 0;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  box-shadow: var(--shadow-soft);
  transition: background-color 150ms ease;
}

.reveal-button:hover {
  background: var(--accent-strong);
}

.spoiler-hide {
  display: none;
  margin-bottom: 0.65rem;
  min-height: 1.9rem;
  padding: 0 0.75rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
}

.spoiler.open .spoiler-hide {
  display: inline-flex;
  align-items: center;
}

/* ------------------------------------------------------------- cronómetro */

.timer {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.9rem;
  max-width: 86ch;
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel-2);
  transition: border-color 200ms ease;
}

.timer.running {
  border-color: var(--accent-border);
}

.timer.over {
  border-color: color-mix(in srgb, var(--danger) 55%, var(--line));
}

.timer-info {
  display: grid;
  gap: 0.15rem;
  flex: 1;
  min-width: 11rem;
}

.timer-label {
  font-size: 0.85rem;
  font-weight: 750;
}

.timer-goal {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 600;
}

.timer-clock {
  font-family: ui-monospace, "JetBrains Mono", SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 1.7rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.timer.over .timer-clock {
  color: var(--danger);
}

.timer-controls {
  display: flex;
  gap: 0.4rem;
}

.timer-button {
  min-height: 2.15rem;
  padding: 0 0.85rem;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  background: var(--panel);
  color: var(--text-2);
  font-size: 0.8rem;
  font-weight: 700;
}

.timer-button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.timer-button.primary:hover {
  background: var(--accent-strong);
}

.timer-button:not(.primary):hover {
  border-color: var(--accent-border);
  color: var(--accent-strong);
}

/* --------------------------------------------------------- pie del módulo */

.module-footer {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  margin-top: 1.3rem;
}

.module-jump {
  display: grid;
  gap: 0.25rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  color: var(--text);
  text-align: left;
  transition: border-color 150ms ease, transform 150ms ease;
}

.module-jump:hover {
  border-color: var(--accent-border);
  transform: translateY(-1px);
  box-shadow: var(--shadow-soft);
}

.module-jump.jump-next {
  text-align: right;
}

.jump-dir {
  color: var(--accent-strong);
  font-size: 0.74rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.jump-title {
  color: var(--text-2);
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.3;
}

.empty {
  max-width: 40rem;
  padding: 2rem;
  border: 1px dashed var(--line-strong);
  border-radius: 14px;
  background: var(--panel);
  color: var(--text-2);
  line-height: 1.6;
}

.empty p {
  margin: 0 0 0.6rem;
}

.empty p:last-child {
  margin: 0;
}

/* ------------------------------------------------------------- responsive */

@media (max-width: 1040px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: min(21.5rem, 88vw);
    transform: translateX(-105%);
    transition: transform 200ms ease;
    box-shadow: var(--shadow);
  }

  body.sidebar-open .sidebar {
    transform: translateX(0);
  }

  body.sidebar-open .scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 25;
    background: rgba(8, 12, 24, 0.45);
  }

  #menuButton {
    display: inline-grid;
  }

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

@media (max-width: 660px) {
  .content {
    padding: 1rem 0.8rem 3.5rem;
  }

  .topbar {
    margin: -1rem -0.8rem 1rem;
    padding: 0.7rem 0.8rem;
  }

  #expandAll,
  #collapseAll {
    display: none;
  }

  .continue-chip {
    display: none;
  }

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

  .section-card.lvl-2 {
    margin-left: 0.6rem;
  }

  .hero-meter {
    display: none;
  }

  .module-footer {
    grid-template-columns: 1fr;
  }
}

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

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}