/* Capa de estudio: conserva la paleta de Ruta y mejora jerarquía y navegación. */
html { scroll-padding-top: 90px; scrollbar-color: #405367 var(--bg); }
.course-tabs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 5px; }
.term-in-row .p { max-width: 45%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.course-tab { min-width: 0; }
.ct-name { white-space: normal; }
body { caret-color: var(--accent); }
button, input, textarea { font: inherit; }
button, a, input, textarea, summary { -webkit-tap-highlight-color: transparent; touch-action: manipulation; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
input:focus-visible, textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
/* Los títulos reciben foco programático para lectores de pantalla; no son controles. */
.mod-head:focus, .mod-head:focus-visible, .lesson h3:focus, .lesson h3:focus-visible,
.study-page > h1:focus, .study-page > h1:focus-visible,
.study-page > h2:focus, .study-page > h2:focus-visible { outline: none; }
a { text-underline-offset: .22em; }
[hidden] { display: none !important; }
.skip-link { position: fixed; top: 8px; left: 16px; z-index: 200; background: var(--accent); color: var(--accent-ink); padding: 10px 16px; border-radius: 8px; transform: translateY(-180%); }
.skip-link:focus { transform: none; }
.topbar { background: var(--bg-soft); }
.brand-name { font-size: 19px; }
.topbar-actions { display: flex; gap: 8px; margin-left: auto; }
.ghost-btn { margin-left: 0; min-height: 40px; }
.menu-toggle { display: none; }
.sidebar-head h1 { font-size: 18px; }
.sidebar-head p { font-size: 13px; }
.sidebar { padding-top: 28px; }
.course-tabs { margin-bottom: 20px; }
.mod-item { border-radius: 8px; padding-block: 11px; }
.mod-item.active { background: #132c2c; border-color: #2f5c58; }
.mod-meta { font-family: var(--sans); font-size: 12px; }
.mod-num { color: var(--muted); }
.course-search { margin: 0 5px 22px; }
.course-search label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 7px; }
.course-search input { width: 100%; min-width: 0; padding: 10px 11px; min-height: 42px; color: var(--text); background: var(--bg); border: 1px solid #354657; border-radius: 8px; font-size: 13px; }
input::placeholder, textarea::placeholder { color: #9aaabd; opacity: 1; }
.search-status { font-size: 12px; color: var(--muted); margin-top: 6px; }
.search-status:empty { margin: 0; }
#searchResults { max-height: 360px; overflow: auto; }
.search-result { display: block; width: 100%; text-align: left; padding: 11px 4px; background: transparent; border: 0; border-bottom: 1px solid var(--line); color: var(--text); cursor: pointer; }
.search-result:hover { background: var(--panel); }
.search-result strong { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; font-size: 13px; font-weight: 550; line-height: 1.45; }
.search-result span { display: block; margin-top: 4px; font-size: 11px; color: var(--muted); }
.main { padding-top: 46px; }
.view { animation: none; }
.mod-head { margin-bottom: 24px; }
.mod-head h2 { font-size: clamp(28px, 3.2vw, 42px); font-weight: 650; line-height: 1.13; text-wrap: balance; margin: 0 0 12px; }
.module-meta { margin: 0 0 16px; font-size: 13px; color: var(--accent); }
.mod-head .blurb { font-size: 17px; line-height: 1.65; }
.module-guide { margin-bottom: 38px; border-block: 1px solid var(--line); padding-block: 18px 0; }
.guide-meta { display: flex; flex-wrap: wrap; gap: 8px 22px; font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.module-progress { height: 3px; background: var(--line); margin-block: 14px 18px; overflow: hidden; }
.module-progress span { display: block; height: 100%; background: var(--accent); transition: width .2s ease; }
.module-goals { padding-left: 18px; margin: 0 0 18px; color: #c5d5e4; font-size: 14px; line-height: 1.8; }
.module-goals li::marker { color: var(--accent); }
.guide-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.module-outline { border-top: 1px solid var(--line); }
.module-outline summary { cursor: pointer; font-size: 13px; font-weight: 600; padding-block: 13px; color: var(--muted); }
.module-outline summary:hover { color: var(--text); }
.module-outline ol { margin: 0 0 18px; padding-left: 24px; color: var(--dim); font-size: 13px; }
.module-outline li { margin-top: 5px; }
.module-outline button { padding: 5px 4px; border: 0; color: var(--text); background: transparent; cursor: pointer; text-align: left; font-size: 14px; }
.module-outline button:hover { color: var(--accent); }
.lesson { padding-block: 30px 12px; }
.lesson h3 { font-size: 22px; line-height: 1.35; text-wrap: balance; }
.lesson p, .lesson > ul { max-width: 72ch; }
.lesson p { line-height: 1.8; }
.lesson-source { font-size: 12px; color: var(--muted) !important; margin-top: 18px !important; }
.table-scroll { max-width: 100%; overflow-x: auto; margin-block: 20px; }
.reference-table { width: 100%; border-collapse: collapse; font-size: 13px; text-align: left; }
.reference-table th { color: var(--text); font-weight: 600; background: var(--panel); }
.reference-table th, .reference-table td { padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.reference-table code { white-space: normal; }
.btn { min-height: 42px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.small { min-height: 36px; }
.ex { scroll-margin-top: 24px; }
.ex-head { scroll-margin-top: 90px; }
.ex-id, .pill, .count, .sql-table { font-variant-numeric: tabular-nums; }
.ex-prompt { line-height: 1.75; }
.order-remove { margin-left: auto; border: 1px solid var(--line); border-radius: 6px; background: transparent; color: var(--muted); padding: 5px 9px; font-size: 12px; cursor: pointer; }
.order-remove:hover { color: var(--text); background: var(--panel); }
.term-out { font-size: 13px; }
.term-in { min-height: 40px; }
.note { border-left-width: 1px; }
.clipboard-fallback { position: fixed; left: -9999px; top: 0; }
.nav-backdrop { position: fixed; inset: 62px 0 0; z-index: 41; border: 0; padding: 0; background: rgba(0, 0, 0, .65); }
.menu-open { overflow: hidden; }
@media (max-width: 1080px) and (min-width: 861px) {
  .shell { grid-template-columns: 275px minmax(0, 1fr); }
  .main { padding-inline: 30px; }
}
@media (max-width: 860px) {
  .topbar { gap: 10px; padding-inline: 12px; }
  .menu-toggle { display: grid; place-items: center; width: 40px; flex: none; padding: 0; }
  .topbar-progress { max-width: none; }
  .sidebar { position: fixed; inset: 62px auto 0 0; width: min(340px, 88vw); height: auto; z-index: 42; background: var(--bg-soft); border-right: 1px solid var(--line); padding: 24px 18px 40px; transform: translateX(-100%); visibility: hidden; overscroll-behavior: contain; }
  .menu-open .sidebar { transform: none; visibility: visible; }
  #moduleList { display: block; overflow: visible; mask-image: none; -webkit-mask-image: none; }
  .mod-item { width: 100%; margin-block: 3px; }
  .sidebar-foot { display: block; }
  .main { padding: 30px 24px 70px; }
  .topbar-actions .ghost-btn { font-size: 12px; min-height: 38px; padding-inline: 10px; }
  .lesson h3 { font-size: 21px; }
}
@media (max-width: 540px) {
  .brand { display: none; }
  .topbar { gap: 7px; }
  .topbar-progress { flex: 1; gap: 0; }
  .topbar-progress .count { font-size: 11.5px; }
  .topbar-actions { gap: 5px; }
  .topbar-actions .ghost-btn { padding-inline: 8px; min-height: 42px; }
  .main { padding: 26px 18px 60px; }
  .guide-meta { gap: 5px 14px; }
  .mod-head .blurb { font-size: 16px; }
  .lesson p { font-size: 15px; }
  .lesson h3 { font-size: 20px; }
  .sql-actions { gap: 8px; }
  .sql-input, .term-in, .fill-row input, .course-search input, .cheat-search { font-size: 16px; }
  .sql-input { min-height: 145px; }
  .sql-table { font-size: 12px; }
  .btn.small, .copy-mini, .copy-btn, .preview-btn { min-height: 40px; }
  .modal-x { width: 44px; height: 44px; }
  .icon-btn { width: 36px; height: 36px; }
  .reference-table { min-width: 540px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Práctica: los paneles comparten controles y foco con el curso. */
.practice-hub, .practice-session, .practice-lab { padding: 20px; min-width: 0; }
.practice-hub p, .practice-lab p { line-height: 1.6; margin: 12px 0; }
.practice-tools, .practice-summary { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 14px 0; }
.practice-summary { font-size: 14px; color: #a6bacb; }
.practice-summary strong { color: var(--text); font-weight: 600; }
.ex > .practice-tools, .ex > .practice-hints { padding: 0 22px; }
.practice-status, .practice-limits { color: #a6bacb; font-size: 13px; }
.practice-courses { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin: 16px 0; }
.practice-course { padding: 18px; border: 1px solid #293b4b; border-radius: 10px; background: #111922; }
.practice-course .btn { margin: 4px; }
.practice-field { display: grid; gap: 8px; margin: 12px 0; min-width: 0; font-size: 13px; }
.practice-field input, .practice-field textarea, .practice-hub select, .practice-lab select { width: 100%; max-width: 100%; box-sizing: border-box; border: 1px solid #3b5265; border-radius: 6px; padding: 10px; background: #0a0e13; color: #e7eef5; font: inherit; }
.practice-hub select { width: auto; margin-right: 12px; }
.practice-field textarea { min-height: 95px; resize: vertical; }
.practice-field .lab-code { min-height: 240px; font-family: ui-monospace, Consolas, monospace; font-size: 14px; tab-size: 2; }
.lab-layout { display: grid; grid-template-columns: minmax(170px, .85fr) minmax(260px, 1.4fr) minmax(180px, 1fr); gap: 18px; }
.lab-panel { min-width: 0; }
.practice-lab pre { max-width: 100%; overflow: auto; padding: 12px; background: #0a0e13; border: 1px solid #293b4b; border-radius: 6px; font-size: 12px; }
.lab-output { min-height: 100px; max-height: 360px; white-space: pre-wrap; overflow-wrap: anywhere; }
.lab-state { max-height: 520px; overflow: auto; }
.lab-state summary { overflow-wrap: anywhere; padding: 5px 0; }
.lab-rubric { list-style: none; padding: 0; font-size: 13px; }
.lab-rubric li { padding: 8px 0; }
.criterion-ok { color: #5eead4; }
.criterion-pending { color: #f0b429; }
.practice-lab details summary { cursor: pointer; }
.lab-tabs { display: none; }
.modal.wide:has(.practice-lab) { width: min(1300px, calc(100vw - 32px)); max-width: 1300px; }
[hidden] { display: none !important; }
@media (max-width: 900px) {
  .lab-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin: 15px 0; }
  .lab-tabs [aria-pressed="true"] { border-color: #5eead4; color: #5eead4; }
  .lab-layout { display: block; }
  .practice-lab .lab-panel { display: none; }
  .practice-lab[data-active="0"] [data-panel="0"], .practice-lab[data-active="1"] [data-panel="1"], .practice-lab[data-active="2"] [data-panel="2"] { display: block; }
}
@media (max-width: 600px) {
  .practice-courses { grid-template-columns: 1fr; }
  .practice-hub, .practice-session, .practice-lab { padding: 12px; }
  .practice-field input, .practice-field textarea, .practice-hub select { font-size: 16px; }
  .topbar-actions { flex-wrap: wrap; }
}