/* ============================================================
   Azure AI Foundry - Ruta de estudio (styles)
   Tema claro / oscuro con variables. Sin build.
============================================================ */

:root {
  --sidebar-w: 288px;
  --topbar-h: 60px;
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --fs-body: 15.5px;
  --lh-body: 1.7;
  --font-sans: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', Consolas, 'Courier New', monospace;
  --transition: 180ms ease;
}

/* --- Tema oscuro (default) --- */
[data-theme="dark"] {
  --bg: #0d1117;
  --bg-elev: #161b22;
  --bg-soft: #1c232d;
  --panel: #10161d;
  --border: #2a333d;
  --border-strong: #3a4553;
  --text: #e6edf3;
  --text-muted: #9aa5b1;
  --text-dim: #6b7684;
  --accent: #4ea6ff;
  --accent-strong: #79bbff;
  --accent-soft: rgba(78,166,255,0.14);
  --accent-on: #071522;
  --success: #3fb950;
  --warning: #d29922;
  --danger: #f85149;
  --chip-bg: #1f2731;
  --chip-text: #b6c1cd;
  --code-bg: #0b1017;
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
}

/* --- Tema claro --- */
[data-theme="light"] {
  --bg: #f7f9fc;
  --bg-elev: #ffffff;
  --bg-soft: #eef2f7;
  --panel: #ffffff;
  --border: #dfe4ea;
  --border-strong: #c7ced6;
  --text: #1a2027;
  --text-muted: #4a5560;
  --text-dim: #7a848f;
  --accent: #0a66c2;
  --accent-strong: #084d95;
  --accent-soft: rgba(10,102,194,0.12);
  --accent-on: #ffffff;
  --success: #1a7f37;
  --warning: #9a6700;
  --danger: #cf222e;
  --chip-bg: #eef2f7;
  --chip-text: #38424c;
  --code-bg: #f2f5f9;
  --shadow: 0 6px 18px rgba(16,24,40,0.08);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

/* ==================== SIDEBAR ==================== */
.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 20px 14px;
  overflow-y: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 4px 8px 22px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}
.brand-mark {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent) 0%, #7c3aed 100%);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  letter-spacing: 0.5px;
  box-shadow: var(--shadow);
}
.brand-title { font-weight: 700; font-size: 15px; }
.brand-sub { font-size: 12px; color: var(--text-muted); }

.nav { display: flex; flex-direction: column; gap: 2px; }
.nav-section {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 14px 10px 6px;
}
.nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  transition: background var(--transition), color var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}
.nav a:hover { background: var(--bg-soft); }
.nav a.active {
  background: var(--accent);
  color: var(--accent-on);
  border-color: var(--accent);
  font-weight: 600;
}
.nav a .num {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--bg-soft);
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 700;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.nav a.active .num { background: var(--accent-on); color: var(--accent); }
.nav a.special {
  background: linear-gradient(135deg, var(--accent-soft), transparent);
  border: 1px dashed color-mix(in oklab, var(--accent) 30%, transparent);
  font-weight: 600;
}

.sidebar-footer {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12.5px;
}
.sidebar-footer a { color: var(--text-muted); text-decoration: none; }
.sidebar-footer a:hover { color: var(--accent); }

/* ==================== MAIN ==================== */
.main {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--topbar-h);
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 22px;
}
.icon-btn {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 36px; height: 36px;
  display: grid; place-items: center;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.icon-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}
#menuToggle { display: none; }

.search-wrap {
  position: relative;
  flex: 1;
  max-width: 640px;
}
#search {
  width: 100%;
  height: 38px;
  padding: 0 14px;
  background: var(--bg-elev);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-family: inherit;
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
#search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.search-results {
  position: absolute;
  top: calc(100% + 6px);
  left: 0; right: 0;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  max-height: 60vh;
  overflow-y: auto;
  padding: 6px;
}
.search-results .sr-item {
  display: block;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--text);
  text-decoration: none;
  cursor: pointer;
}
.search-results .sr-item:hover { background: var(--bg-soft); }
.search-results .sr-title { font-weight: 600; font-size: 14px; }
.search-results .sr-context { font-size: 12.5px; color: var(--text-muted); margin-top: 2px; }
.search-results .sr-badge {
  display: inline-block;
  font-size: 10.5px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--chip-bg);
  color: var(--chip-text);
  margin-right: 8px;
  vertical-align: middle;
}
.search-results .sr-empty { padding: 14px; color: var(--text-muted); font-size: 13px; text-align: center; }

.topbar-actions { display: flex; gap: 8px; }

.progress {
  height: 3px;
  background: transparent;
  overflow: hidden;
}
.progress.loading::after {
  content: "";
  display: block;
  height: 100%;
  width: 30%;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  animation: slide 1.2s infinite ease-in-out;
}
@keyframes slide {
  from { transform: translateX(-100%); }
  to { transform: translateX(400%); }
}

/* ==================== CONTENT ==================== */
.content {
  padding: 32px clamp(20px, 5vw, 56px) 60px;
  max-width: 980px;
  width: 100%;
  margin: 0 auto;
  outline: none;
}
.loading { color: var(--text-muted); padding: 40px 0; }

.content h1, .content h2, .content h3, .content h4 {
  color: var(--text);
  line-height: 1.25;
  margin-top: 1.6em;
  margin-bottom: 0.5em;
  scroll-margin-top: calc(var(--topbar-h) + 16px);
}
.content h1 {
  font-size: 2rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
  margin-top: 0.2em;
}
.content h2 { font-size: 1.5rem; margin-top: 2.2em; }
.content h3 { font-size: 1.18rem; color: var(--accent-strong); }
.content p { margin: 0.7em 0; }
.content a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color var(--transition); }
.content a:hover { border-bottom-color: var(--accent); }

.content ul, .content ol { padding-left: 1.4em; }
.content li { margin: 0.25em 0; }
.content li > p { margin: 0.25em 0; }

blockquote {
  margin: 1.2em 0;
  padding: 12px 16px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text);
}
blockquote p { margin: 0.2em 0; }

/* Código */
code {
  font-family: var(--font-mono);
  font-size: 13.5px;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.55;
}
pre code {
  background: transparent;
  border: 0;
  padding: 0;
  font-size: 13px;
}

/* Tablas */
.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2em 0;
  font-size: 14px;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.content thead th {
  background: var(--bg-soft);
  text-align: left;
  padding: 10px 14px;
  font-weight: 600;
  color: var(--text);
  border-bottom: 1px solid var(--border);
}
.content tbody td {
  padding: 10px 14px;
  border-top: 1px solid var(--border);
  vertical-align: top;
}
.content tbody tr:hover td { background: var(--bg-soft); }

/* HR */
.content hr { border: none; border-top: 1px solid var(--border); margin: 2em 0; }

.foot {
  padding: 24px clamp(20px, 5vw, 56px);
  color: var(--text-muted);
  font-size: 12.5px;
  border-top: 1px solid var(--border);
}
.foot a { color: var(--text-muted); }

/* ==================== HOME (dashboard) ==================== */
.hero {
  padding: 8px 0 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
}
.hero .eyebrow {
  display: inline-block;
  font-size: 11.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
}
.hero h1 {
  font-size: 2.4rem;
  margin: 0 0 8px;
  border: 0;
  padding: 0;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent-strong) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p { color: var(--text-muted); font-size: 1.05rem; max-width: 640px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
  margin-top: 8px;
}
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  text-decoration: none;
  color: var(--text);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.card .card-num {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.06em;
}
.card .card-title { font-weight: 600; font-size: 16px; }
.card .card-desc { font-size: 13.5px; color: var(--text-muted); }

/* ==================== GLOSARIO ==================== */
.glossary-controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 8px 0 22px;
  align-items: center;
}
#glossaryFilter {
  flex: 1;
  min-width: 220px;
  height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  outline: none;
}
#glossaryFilter:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

.module-chip {
  font-size: 11.5px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--chip-bg);
  color: var(--chip-text);
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  user-select: none;
}
.module-chip:hover { border-color: var(--border-strong); }
.module-chip.active {
  background: var(--accent);
  color: var(--accent-on);
}

.glossary-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 14px;
}
.glossary-item {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  transition: border-color var(--transition), transform var(--transition);
}
.glossary-item:hover { border-color: var(--accent); transform: translateY(-1px); }
.glossary-item h4 {
  margin: 0 0 6px;
  font-size: 15.5px;
  color: var(--accent-strong);
  font-weight: 700;
}
.glossary-item .def {
  color: var(--text);
  font-size: 14px;
  line-height: 1.55;
}
.glossary-item .src {
  margin-top: 10px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  color: var(--text-muted);
  text-decoration: none;
  padding: 3px 10px;
  background: var(--bg-soft);
  border-radius: 999px;
}
.glossary-item .src:hover { color: var(--accent); }

.glossary-letter {
  grid-column: 1 / -1;
  margin: 20px 0 4px;
  font-size: 22px;
  font-weight: 700;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
}

.empty {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}

/* ==================== BOTONES ==================== */
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 10px 22px;
  font-family: inherit;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.btn-primary:hover {
  background: var(--accent-strong);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.chip-btn {
  background: var(--bg-elev);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 16px;
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.chip-btn:hover { border-color: var(--accent); color: var(--accent); }
.content a.chip-btn { color: var(--text); }
.content a.chip-btn:hover { color: var(--accent-on); background: var(--accent); border-color: var(--accent); }
.content a.btn-primary, .content a.btn-primary:hover, .content a.btn-primary:visited { color: var(--accent-on); }

.card-accent {
  border-color: color-mix(in oklab, var(--accent) 40%, var(--border));
  background: linear-gradient(135deg, var(--accent-soft), var(--bg-elev));
}

/* ==================== ENTREVISTA (Q&A) ==================== */
.qa-controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  margin: 8px 0 14px;
}
#qaFilter {
  flex: 1;
  min-width: 220px;
  height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  outline: none;
}
#qaFilter:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

.qa-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 10px;
}

.qa-item {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}
.qa-item:hover { border-color: var(--border-strong); }
.qa-item[open] { border-color: var(--accent); box-shadow: var(--shadow); }

.qa-item summary {
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  transition: background var(--transition);
}
.qa-item summary::-webkit-details-marker { display: none; }
.qa-item summary::after {
  content: "▸";
  color: var(--text-muted);
  font-size: 12px;
  transition: transform var(--transition);
  grid-column: 3;
  order: 99;
}
.qa-item[open] summary::after { transform: rotate(90deg); color: var(--accent); }
.qa-item summary:hover { background: var(--bg-soft); }

.qa-num {
  width: 30px; height: 30px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 700;
  font-size: 12.5px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.qa-q {
  font-weight: 600;
  font-size: 14.5px;
  color: var(--text);
  line-height: 1.5;
}
.qa-topics {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: flex-end;
  max-width: 40%;
}
.qa-topic {
  font-size: 10.5px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--chip-bg);
  color: var(--chip-text);
  white-space: nowrap;
}
.qa-a {
  padding: 4px 18px 18px 62px;
  color: var(--text);
  font-size: 14.5px;
  line-height: 1.7;
  border-top: 1px dashed var(--border);
  margin-top: -1px;
}
.qa-a code {
  font-size: 12.5px;
}
.qa-a strong { color: var(--text); }

/* ==================== QUIZ ==================== */
.quiz-start {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  text-align: center;
}
.quiz-start-info {
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--text-muted);
  font-size: 14.5px;
}
.quiz-start-info strong { color: var(--text); }

.quiz-progress {
  height: 6px;
  background: var(--bg-soft);
  border-radius: 999px;
  overflow: hidden;
  margin-top: 12px;
}
.quiz-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), color-mix(in oklab, var(--accent) 60%, #7c3aed));
  transition: width var(--transition);
}

.quiz-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px 28px;
  box-shadow: var(--shadow);
}
.quiz-topic {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.quiz-question {
  font-size: 1.35rem;
  margin: 0 0 22px;
  line-height: 1.4;
  color: var(--text);
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.quiz-option {
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  text-align: left;
  cursor: pointer;
  color: var(--text);
  font-family: inherit;
  font-size: 14.5px;
  display: flex;
  align-items: center;
  gap: 14px;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
}
.quiz-option:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateX(2px);
}
.quiz-option:disabled { cursor: default; }

.quiz-option-letter {
  width: 30px; height: 30px;
  border-radius: 8px;
  background: var(--bg-soft);
  color: var(--text-muted);
  font-weight: 700;
  font-size: 13px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  transition: background var(--transition), color var(--transition);
}
.quiz-option:hover:not(:disabled) .quiz-option-letter {
  background: var(--accent);
  color: #fff;
}

.quiz-option.correct {
  border-color: var(--success);
  background: color-mix(in oklab, var(--success) 12%, transparent);
}
.quiz-option.correct .quiz-option-letter {
  background: var(--success);
  color: #fff;
}
.quiz-option.incorrect {
  border-color: var(--danger);
  background: color-mix(in oklab, var(--danger) 12%, transparent);
}
.quiz-option.incorrect .quiz-option-letter {
  background: var(--danger);
  color: #fff;
}

.quiz-feedback {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: var(--radius);
  border-left: 3px solid;
  font-size: 14px;
  line-height: 1.6;
}
.quiz-feedback.ok {
  background: color-mix(in oklab, var(--success) 10%, transparent);
  border-color: var(--success);
  color: var(--text);
}
.quiz-feedback.bad {
  background: color-mix(in oklab, var(--danger) 10%, transparent);
  border-color: var(--danger);
  color: var(--text);
}
.quiz-feedback-title {
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 4px;
}
.quiz-feedback.ok .quiz-feedback-title { color: var(--success); }
.quiz-feedback.bad .quiz-feedback-title { color: var(--danger); }
.quiz-feedback-explain { color: var(--text-muted); }

.quiz-actions {
  margin-top: 20px;
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
}

.quiz-result {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 30px;
  align-items: center;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
}
.quiz-score {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background:
    conic-gradient(var(--accent) calc(var(--pct, 0) * 1%), var(--bg-soft) 0);
  display: grid;
  place-items: center;
  position: relative;
}
.quiz-score::before {
  content: "";
  position: absolute;
  inset: 12px;
  background: var(--bg-elev);
  border-radius: 50%;
}
.quiz-score-num {
  position: relative;
  z-index: 1;
  font-size: 3rem;
  font-weight: 700;
  color: var(--text);
}
.quiz-score-num span { font-size: 1.4rem; color: var(--text-muted); margin-left: 3px; }

.quiz-breakdown h3 { margin-top: 0; font-size: 1rem; color: var(--text-muted); }
.quiz-breakdown table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.quiz-breakdown th, .quiz-breakdown td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}
.quiz-breakdown th { color: var(--text-muted); font-weight: 600; text-align: left; }

@media (max-width: 640px) {
  .quiz-result { grid-template-columns: 1fr; text-align: center; }
  .quiz-score { margin: 0 auto; }
  .qa-item summary { grid-template-columns: auto 1fr; }
  .qa-topics { grid-column: 1 / -1; max-width: 100%; justify-content: flex-start; }
.qa-a { padding-left: 18px; }
}

/* ==================== RESPONSIVE ==================== */
.study-controls { display: flex; flex-wrap: wrap; gap: 16px; margin: 20px 0; }
.study-controls label { flex: 1 1 180px; }
.study-controls label, .study-question label { display: grid; gap: 7px; color: var(--text-muted); }
.study-controls select, .study-controls input, .study-question textarea { width: 100%; min-width: 0; padding: 12px; border: 1px solid var(--border); border-radius: 8px; color: var(--text); background: var(--bg-elev); font: inherit; }
.study-question { padding: 22px; margin: 18px 0; border: 1px solid var(--border); border-radius: 12px; background: var(--bg-elev); overflow-wrap: anywhere; }
.study-question h2 { font-size: 1.2rem; margin: 10px 0 18px; }
.study-question summary { cursor: pointer; font-weight: 600; padding: 14px 0; }
.study-meta { font-size: .85rem; color: var(--text-muted); }
.study-meta a { display: inline-block; margin: 4px 0; }
.study-answer, .study-feedback { line-height: 1.7; }
.study-question textarea { resize: vertical; }
.study-progress { width: 100%; height: 10px; accent-color: var(--accent); }
.quiz-option.selected { outline: 2px solid var(--accent); outline-offset: 2px; }
button:disabled { cursor: default; opacity: .7; }
button:focus-visible, select:focus-visible, summary:focus-visible, a:focus-visible, textarea:focus-visible, input:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.quiz-actions, .qa-controls { flex-wrap: wrap; }

/* Foundry learning path, coverage and study feedback */
.learning-stats { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 12px; margin: 24px 0; }
.learning-stats span { padding: 15px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px; font-size: .85rem; color: var(--text-muted); }
.learning-stats strong { display: block; font-size: 1.8rem; color: var(--text); margin-bottom: 3px; }
.competency-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 12px; }
.coverage-card { display: grid; gap: 10px; padding: 16px; border: 1px solid var(--border); border-radius: 10px; background: var(--bg-elev); }
.coverage-card strong { font-size: .95rem; }
.coverage-card span { font-size: .8rem; color: var(--text-muted); }
.coverage-card progress { width: 100%; height: 8px; accent-color: var(--accent); }
.configuration-note, .oral-prompt, .study-next { padding: 16px 20px; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 8px 8px 0; }
.bank-count { font-weight: 600; padding: 15px; background: var(--accent-soft); border-radius: 10px; }

/* Interview practice: simple Foundry lifecycle areas and direct Q&A. */
.interview-areas { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 10px; margin: 24px 0; }
.interview-areas button { display: flex; align-items: center; justify-content: space-between; gap: 10px; min-height: 48px; text-align: left; }
.interview-areas button[aria-pressed="true"] { border-color: var(--accent); color: var(--accent-on); background: var(--accent); }
.interview-area-heading { margin: 28px 0 16px; }
.interview-area-heading h2 { margin-bottom: 6px; }
.interview-area-heading p { margin: 4px 0; }
.interview-question summary { grid-template-columns: auto 1fr; }
.interview-question summary strong, .answer-label { color: var(--accent-strong); font-weight: 700; }
.interview-question .qa-a { padding: 4px 22px 18px 62px; line-height: 1.7; }
.interview-question .qa-a p { margin: 8px 0; }
.interview-question .qa-a .study-meta { font-size: .8rem; }
.foundry-path-list { display: grid; gap: 12px; margin: 20px 0 28px; }
.foundry-path-card { border: 1px solid var(--border); border-radius: 12px; background: var(--bg-elev); overflow: hidden; }
.foundry-path-card > summary { cursor: pointer; padding: 18px 20px; display: flex; align-items: center; gap: 16px; }
.foundry-path-card > summary::after { content: '+'; margin-left: auto; font-size: 1.4rem; color: var(--text-muted); }
.foundry-path-card[open] > summary::after { content: '−'; }
.foundry-path-card > summary small { display: block; margin-top: 4px; color: var(--text-muted); font-size: .9rem; font-weight: 400; }
.foundry-path-body { padding: 0 24px 20px; border-top: 1px solid var(--border); line-height: 1.65; }
.foundry-capability-list { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px; }
.foundry-capability { min-width: 0; padding: 16px; background: var(--bg); border: 1px solid var(--border); border-radius: 10px; }
.foundry-capability header { display: flex; align-items: flex-start; gap: 10px; justify-content: space-between; }
.foundry-capability h3 { margin: 0; font-size: 1rem; }
.foundry-capability > p { margin: 10px 0 0; }
.capability-status { flex: 0 0 auto; padding: 3px 8px; border-radius: 999px; background: var(--bg-soft); color: var(--text-muted); border: 1px solid var(--border-strong); font-size: .75rem; font-weight: 700; }
.foundry-capability .interview-answer { margin-top: 12px; font-size: .9rem; }
.foundry-path-body h3 { margin: 16px 0 8px; }
.foundry-path-body li { margin: 7px 0; }
.foundry-path-body p { margin: 12px 0; }
.foundry-path-body a { margin-right: 6px; }
.interview-answer { padding: 14px 16px; background: var(--accent-soft); border-left: 3px solid var(--accent); border-radius: 0 8px 8px 0; }
.interview-answer strong { color: var(--accent-strong); }
@media (max-width: 640px) {
  .interview-areas { grid-template-columns: repeat(2, minmax(0,1fr)); gap: 8px; }
  .interview-question .qa-a { padding-left: 18px; }
  .foundry-path-card > summary { padding: 16px; gap: 12px; }
  .foundry-path-body { padding: 0 16px 16px; }
  .foundry-capability-list { grid-template-columns: 1fr; }
}
.study-routine { margin: 24px 0 36px; padding: 24px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px; }
.lesson-list { display: grid; gap: 14px; }
.lesson-card { border: 1px solid var(--border); border-radius: 12px; background: var(--bg-elev); scroll-margin-top: 90px; overflow-wrap: anywhere; }
.lesson-card > summary { cursor: pointer; padding: 20px; display: flex; gap: 16px; align-items: center; }
.lesson-card > summary::after { content: '+'; margin-left: auto; font-size: 1.5rem; color: var(--text-muted); }
.lesson-card[open] > summary::after { content: '−'; }
.lesson-card > summary small { display: block; margin-top: 6px; color: var(--text-muted); font-size: .78rem; font-weight: 400; }
.lesson-number { font-family: var(--font-mono, monospace); color: var(--accent); font-weight: 700; }
.lesson-body { padding: 0 24px 24px; border-top: 1px solid var(--border); line-height: 1.75; }
.lesson-check { display: flex; align-items: flex-start; gap: 10px; margin: 20px 0 12px; font-size: .9rem; }
.lesson-check input { margin-top: 5px; accent-color: var(--accent); }
.case-study { padding: 24px; margin: 20px 0; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px; }
.case-study label { display: grid; gap: 8px; color: var(--text-muted); }
.case-study textarea { width: 100%; max-width: 100%; padding: 14px; resize: vertical; color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: 8px; font: inherit; }
.case-study summary, .study-method summary { cursor: pointer; padding: 16px 0; font-weight: 600; }
.qa-controls a { display: inline-flex; align-items: center; text-decoration: none; }
.study-controls select { text-overflow: ellipsis; }
@media (max-width: 680px) {
  .learning-stats, .competency-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .study-controls label { flex-basis: 100%; }
  .lesson-body, .case-study, .study-routine { padding: 16px; }
  .lesson-card > summary { padding: 16px; }
  .learning-stats strong { font-size: 1.5rem; }
}
@media (max-width: 400px) { .competency-grid { grid-template-columns: 1fr; } }

@media (max-width: 900px) {
  body { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    top: 0; left: 0;
    width: min(320px, 88vw);
    z-index: 40;
    transform: translateX(-100%);
    transition: transform var(--transition);
    box-shadow: var(--shadow);
  }
  body.sidebar-open .sidebar { transform: translateX(0); }
  body.sidebar-open::after {
    content: "";
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.45);
    z-index: 30;
  }
  #menuToggle { display: grid; }
  .content { padding: 24px 20px 40px; }
  .hero h1 { font-size: 1.8rem; }
}