/* ==========================================================================
   Ruta Git — estilos
   ========================================================================== */

:root {
  --bg: #0a0e13;
  --bg-soft: #0e141b;
  --panel: #111922;
  --panel-2: #16212c;
  --line: #1f2c39;
  --line-soft: #182430;
  --text: #e7eef5;
  --muted: #8fa0b2;
  --dim: #91a2b4;
  --accent: #5eead4;
  --accent-ink: #04201c;
  --amber: #f0b429;
  --ok: #46c46e;
  --err: #ff6b6b;
  --warn: #e3b341;
  --radius: 14px;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(94, 234, 212, .28); color: #f4fffd; }

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

a { color: var(--accent); }

/* ------------------------------- topbar ------------------------------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  height: 62px;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 0 22px;
  background: rgba(10, 14, 19, 0.94);
  border-bottom: 1px solid var(--line-soft);
}

.brand { display: flex; align-items: center; gap: 10px; min-width: 190px; }
.brand svg { width: 26px; height: 26px; color: var(--accent); }
.brand-name { font-weight: 650; letter-spacing: -0.01em; font-size: 16px; }

.topbar-progress { display: flex; align-items: center; gap: 12px; flex: 1; max-width: 520px; }
.topbar-progress .bar {
  position: relative;
  flex: 1;
  height: 6px;
  border-radius: 99px;
  background: var(--line);
  overflow: hidden;
}
.topbar-progress .bar span {
  position: absolute; inset: 0 auto 0 0;
  width: 0;
  border-radius: 99px;
  background: var(--accent);
  transition: width .45s cubic-bezier(.22,.9,.25,1);
}
.topbar-progress .count { font-family: var(--mono); font-size: 12px; color: var(--muted); white-space: nowrap; }

.ghost-btn {
  margin-left: auto;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 7px 12px;
  font-size: 12.5px;
  font-family: var(--sans);
  cursor: pointer;
  transition: .18s ease;
}
.ghost-btn:hover { color: var(--text); border-color: #2e4256; background: var(--panel); }

/* ------------------------------- layout ------------------------------- */
.shell {
  display: grid;
  grid-template-columns: 318px minmax(0, 1fr);
  align-items: start;
  max-width: 1420px;
  margin: 0 auto;
}

.sidebar {
  position: sticky;
  top: 62px;
  height: calc(100vh - 62px);
  overflow-y: auto;
  padding: 24px 16px 40px 22px;
  border-right: 1px solid var(--line-soft);
}

.sidebar::-webkit-scrollbar, .term-out::-webkit-scrollbar { width: 8px; }
.sidebar::-webkit-scrollbar-thumb, .term-out::-webkit-scrollbar-thumb {
  background: #24323f; border-radius: 20px;
}

.sidebar-head { padding: 0 6px 18px; }
.sidebar-head h1 { margin: 6px 0 4px; font-size: 21px; letter-spacing: -0.02em; }
.sidebar-head p { margin: 0; font-size: 12.8px; color: var(--muted); line-height: 1.5; }

.mod-item {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  width: 100%;
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 11px;
  padding: 10px 11px;
  margin-bottom: 2px;
  cursor: pointer;
  color: var(--muted);
  font-family: inherit;
  font-size: 13.4px;
  transition: .16s ease;
}
.mod-item:hover { background: var(--bg-soft); color: var(--text); }
.mod-item.active {
  background: #17181b;
  border-color: transparent;
  color: var(--text);
}
.mod-num {
  flex: none;
  width: 24px; height: 24px;
  display: grid; place-items: center;
  border-radius: 7px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--dim);
  margin-top: 1px;
}
.mod-item.active .mod-num { color: var(--accent); border-color: rgba(94,234,212,.35); background: rgba(94,234,212,.08); }
.mod-item.complete .mod-num { color: var(--ok); border-color: rgba(70,196,110,.4); background: rgba(70,196,110,.1); }
.mod-text { min-width: 0; flex: 1; }
.mod-title { display: block; font-weight: 550; line-height: 1.35; }
.mod-meta { display: block; font-size: 11.4px; color: var(--dim); margin-top: 2px; font-family: var(--mono); }

.sidebar-foot { margin-top: 22px; padding: 12px 8px 0; border-top: 1px solid var(--line-soft); }
.sidebar-foot p { margin: 0; font-size: 11.4px; color: var(--dim); line-height: 1.6; }
.sidebar-foot code { font-size: 10.5px; color: var(--muted); background: var(--panel); padding: 1px 4px; border-radius: 4px; }

/* -------------------------------- main -------------------------------- */
.main { min-width: 0; padding: 34px 46px 120px; }
.view { max-width: 880px; animation: rise .35s ease both; }
@keyframes rise { from { opacity: 0; transform: translateY(9px); } to { opacity: 1; transform: none; } }

.mod-head { margin-bottom: 30px; }
.mod-kicker {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
}
.mod-head h2 {
  margin: 8px 0 10px;
  font-size: 34px;
  line-height: 1.15;
  letter-spacing: -0.028em;
  font-weight: 650;
}
.mod-head .blurb { margin: 0; color: var(--muted); font-size: 16.5px; max-width: 60ch; }

/* ------------------------------ lecciones ------------------------------ */
.lesson {
  border-top: 1px solid var(--line-soft);
  padding: 26px 0 6px;
}
.lesson:first-of-type { border-top: none; padding-top: 6px; }

.lesson h3 {
  margin: 0 0 14px;
  font-size: 20.5px;
  letter-spacing: -0.018em;
  font-weight: 600;
}

.lesson p { margin: 0 0 13px; color: #cfdae5; }
.lesson h4 {
  margin: 24px 0 10px;
  font-size: 13px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: #9db0c4;
  font-weight: 600;
}
.lesson strong { color: #fff; font-weight: 620; }
.lesson em { color: #e9f1f8; }

.lesson code:not(pre code) {
  background: #16212c;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1.5px 6px;
  font-size: 13.2px;
  color: #a5f3e6;
  white-space: nowrap;
}

.lesson ul.clean, .lesson ol.clean { margin: 0 0 15px; padding-left: 20px; color: #cfdae5; }
.lesson li { margin: 5px 0; }
.lesson li::marker { color: var(--accent); }

pre.code {
  position: relative;
  margin: 0 0 16px;
  padding: 16px 18px;
  background: #0b1219;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow-x: auto;
  font-size: 13.2px;
  line-height: 1.72;
  color: #cdd9e5;
}
pre.code code { white-space: pre; }
.copy-btn {
  position: absolute;
  top: 8px; right: 8px;
  background: #16212c;
  border: 1px solid var(--line);
  color: var(--muted);
  border-radius: 7px;
  font-family: var(--mono);
  font-size: 10.5px;
  padding: 4px 8px;
  cursor: pointer;
  opacity: 0;
  transition: .16s ease;
}
pre.code:hover .copy-btn, pre.code:focus-within .copy-btn, .copy-btn:focus-visible { opacity: 1; }
@media (hover: none) { .copy-btn { opacity: 1; } }
.copy-btn:hover { color: var(--accent); border-color: rgba(94,234,212,.35); }
.copy-btn.done { color: var(--ok); border-color: rgba(70,196,110,.4); }

.note {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin: 0 0 16px;
  padding: 13px 15px;
  background: rgba(94, 234, 212, .045);
  border: 1px solid rgba(94, 234, 212, .16);
  border-radius: 10px;
}
.note p { margin: 0; font-size: 14.2px; color: #c6d6e2; line-height: 1.6; }
.note-k {
  flex: none;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: 3px 7px;
  border-radius: 5px;
  background: rgba(94, 234, 212, .12);
  color: var(--accent);
  margin-top: 2px;
}
.note-tip { background: rgba(240, 180, 41, .05); border-color: rgba(240, 180, 41, .18); }
.note-tip .note-k { background: rgba(240, 180, 41, .14); color: var(--amber); }
.note-warn { background: rgba(255, 107, 107, .055); border-color: rgba(255, 107, 107, .2); }
.note-warn .note-k { background: rgba(255, 107, 107, .14); color: var(--err); }

.zones { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 4px 0 18px; }
.zone {
  padding: 13px 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 11px;
}
.zone-t { display: block; font-family: var(--mono); font-size: 11px; color: var(--accent); margin-bottom: 5px; }
.zone p { margin: 0; font-size: 12.9px; color: var(--muted); line-height: 1.55; }

/* ------------------------------ ejercicios ------------------------------ */
.ex-head { display: flex; align-items: center; gap: 10px; margin: 38px 0 4px; }
.ex-head h3 { margin: 0; font-size: 15px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.ex-head .rule { flex: 1; height: 1px; background: var(--line-soft); }
.ex-head .pill {
  font-family: var(--mono); font-size: 11px; color: var(--dim);
  border: 1px solid var(--line); border-radius: 99px; padding: 2px 9px;
}

.ex {
  margin: 14px 0;
  background: #14171a;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.ex.done { border-color: rgba(70, 196, 110, .38); }
.ex.done .ex-body { opacity: .92; }
.ex.shake { animation: shake .38s ease; }
@keyframes shake {
  0%,100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(5px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(2px); }
}

.ex-top {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 16px;
  border-bottom: 1px solid var(--line-soft);
  background: rgba(10, 14, 19, .35);
}
.tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .09em;
  text-transform: uppercase;
  padding: 3px 7px;
  border-radius: 5px;
  border: 1px solid var(--line);
  color: var(--dim);
  white-space: nowrap;
}
.tag.quiz { color: #a6c8ff; border-color: rgba(140,180,255,.25); background: rgba(140,180,255,.07); }
.tag.fill { color: var(--amber); border-color: rgba(240,180,41,.28); background: rgba(240,180,41,.07); }
.tag.term { color: var(--accent); border-color: rgba(94,234,212,.28); background: rgba(94,234,212,.07); }
.ex-id { margin-left: auto; font-family: var(--mono); font-size: 10.5px; color: #7c8fa3; }
.ex-check { color: var(--ok); display: none; font-size: 13px; font-family: var(--mono); }
.ex.done .ex-check { display: inline; }

.ex-body { padding: 16px 16px 16px; }
.ex-prompt { margin: 0 0 14px; font-size: 15px; color: #dde8f2; }
.ex-prompt code {
  background: #16212c; border: 1px solid var(--line); border-radius: 5px;
  padding: 1px 5px; font-size: 12.5px; color: #a5f3e6;
}

/* quiz */
.options { display: grid; gap: 8px; }
.opt {
  display: flex; align-items: flex-start; gap: 10px;
  width: 100%; text-align: left;
  background: #0f1720;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 13px;
  color: #cbd8e4;
  font-family: inherit;
  font-size: 14.2px;
  line-height: 1.5;
  cursor: pointer;
  transition: .15s ease;
}
.opt:hover:not(:disabled) { border-color: #33506a; background: #131e28; }
.opt .key {
  flex: none;
  width: 21px; height: 21px;
  display: grid; place-items: center;
  border-radius: 5px;
  border: 1px solid var(--line);
  font-family: var(--mono); font-size: 10.5px; color: var(--dim);
  margin-top: 1px;
}
.opt.correct { border-color: rgba(70,196,110,.55); background: rgba(70,196,110,.09); color: #dff6e6; }
.opt.correct .key { border-color: rgba(70,196,110,.5); color: var(--ok); }
.opt.wrong { border-color: rgba(255,107,107,.5); background: rgba(255,107,107,.07); color: #ffdcdc; }
.opt.wrong .key { border-color: rgba(255,107,107,.5); color: var(--err); }
.opt:disabled { cursor: default; }

/* fill */
.fill-row { display: flex; gap: 8px; flex-wrap: wrap; }
.fill-row input {
  flex: 1;
  min-width: 220px;
  background: #0b1219;
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 11px 13px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 13.5px;
  outline: none;
  transition: border-color .16s ease, box-shadow .16s ease;
}
.fill-row input:focus { border-color: rgba(94,234,212,.45); }
.fill-row input.ok { border-color: rgba(70,196,110,.55); }
.fill-row input.bad { border-color: rgba(255,107,107,.55); }

.btn {
  background: var(--accent);
  color: var(--accent-ink);
  border: none;
  border-radius: 9px;
  padding: 10px 16px;
  font-family: inherit;
  font-size: 13.5px;
  font-weight: 620;
  cursor: pointer;
  transition: .16s ease;
  white-space: nowrap;
}
.btn:hover { filter: brightness(1.07); }
.btn:active { transform: translateY(1px); }
.btn.secondary {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
  font-weight: 500;
}
.btn.secondary:hover { color: var(--text); border-color: #33506a; background: var(--panel); }
.btn.small { padding: 7px 11px; font-size: 12.3px; border-radius: 8px; }

/* feedback */
.fb {
  display: none;
  margin-top: 13px;
  padding: 11px 13px;
  border-radius: 9px;
  font-size: 13.6px;
  line-height: 1.55;
}
.fb.show { display: block; animation: rise .25s ease both; }
.fb.good { background: rgba(70,196,110,.08); border: 1px solid rgba(70,196,110,.28); color: #cdf0d8; }
.fb.bad { background: rgba(255,107,107,.07); border: 1px solid rgba(255,107,107,.26); color: #ffd9d9; }
.fb strong { font-weight: 650; }
.fb > strong:first-child { display: block; margin-bottom: 3px; font-size: 12.5px; letter-spacing: .02em; }
.fb.good > strong:first-child { color: var(--ok); }
.fb.bad > strong:first-child { color: var(--err); }
.fb code { background: rgba(0,0,0,.3); padding: 1px 5px; border-radius: 4px; font-size: 12.5px; }

/* terminal */
.term {
  margin-top: 4px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #070d13;
  overflow: hidden;
}
.term-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 9px 13px;
  background: #0d151d;
  border-bottom: 1px solid var(--line-soft);
}
.dots { display: flex; gap: 5px; }
.dots i { width: 9px; height: 9px; border-radius: 50%; background: #2b3a49; display: block; }
.dots i:nth-child(1) { background: #f26d6d; }
.dots i:nth-child(2) { background: #e0b03c; }
.dots i:nth-child(3) { background: #51c07a; }
.term-label { font-family: var(--mono); font-size: 10.5px; color: var(--dim); letter-spacing: .06em; }
.term-branch { margin-left: auto; font-family: var(--mono); font-size: 10.5px; color: var(--accent); opacity: .75; }

.term-out {
  min-height: 150px;
  max-height: 330px;
  overflow-y: auto;
  padding: 12px 14px 6px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
}
.term-out .l { color: #b9c9d8; }
.term-out .ok { color: #6fe08d; }
.term-out .err { color: #ff8a8a; }
.term-out .warn { color: #f0c860; }
.term-out .dim { color: #7f92a5; }
.term-out .bold { color: #e6eef7; font-weight: 600; }
.term-out .accent { color: var(--accent); }
.term-out .cmd { color: #dbe7f2; }
.term-out .cmd .p { color: var(--accent); }

.term-in-row {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px 12px;
  border-top: 1px solid var(--line-soft);
}
.term-in-row .p { font-family: var(--mono); font-size: 12.5px; color: var(--accent); white-space: nowrap; }
.term-in {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: #e7eef5;
  font-family: var(--mono);
  font-size: 13px;
  padding: 2px 0;
  caret-color: var(--accent);
}
.term-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; align-items: center; }
.term-actions .spacer { flex: 1; }

.hint-box {
  display: none;
  margin-top: 11px;
  padding: 10px 13px;
  border-radius: 9px;
  background: rgba(240,180,41,.06);
  border: 1px solid rgba(240,180,41,.22);
  font-size: 13.4px;
  color: #eedaac;
}
.hint-box.show { display: block; }
.hint-box code { background: rgba(0,0,0,.28); padding: 1px 5px; border-radius: 4px; }

/* barra de navegación inferior */
.nav-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 42px;
  padding-top: 22px;
  border-top: 1px solid var(--line-soft);
}
.nav-foot .btn { display: inline-flex; align-items: center; gap: 8px; }
.nav-foot .mid { font-family: var(--mono); font-size: 11.5px; color: var(--dim); }

/* toast */
.toast {
  position: fixed;
  bottom: 26px;
  left: 50%;
  transform: translate(-50%, 20px);
  background: #16212c;
  border: 1px solid var(--line);
  color: var(--text);
  padding: 11px 18px;
  border-radius: 11px;
  font-size: 13.4px;
  box-shadow: 0 16px 40px rgba(0,0,0,.45);
  opacity: 0;
  pointer-events: none;
  transition: .25s ease;
  z-index: 60;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ------------------------- itinerarios (sidebar) ------------------------- */
.course-group { margin-bottom: 12px; }
.course-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 8px;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--line-soft);
  padding: 7px 6px 8px;
  margin-bottom: 5px;
  cursor: pointer;
  color: var(--muted);
}
.course-name {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .15em;
  text-transform: uppercase;
}
.course-count { font-family: var(--mono); font-size: 10px; color: var(--dim); }
.course-head:hover .course-name { color: var(--text); }
.course-head.active .course-name { color: var(--accent); }
.course-head.active .course-count { color: var(--accent); opacity: .7; }

.tag.sql { color: #c4b5fd; border-color: rgba(167, 139, 250, .3); background: rgba(167, 139, 250, .08); }

/* ---------------------- selector de itinerario ---------------------- */
.course-tabs { display: flex; gap: 6px; margin: 0 2px 12px; }
.course-tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 7px 9px;
  cursor: pointer;
  color: var(--muted);
  font-family: inherit;
  text-align: left;
  transition: .15s ease;
}
.course-tab:hover { color: var(--text); border-color: #2e4256; }
.course-tab.active {
  background: #17181b;
  border-color: transparent;
  color: var(--text);
}
.ct-name { font-size: 12.4px; font-weight: 600; line-height: 1.25; }
.ct-count { font-family: var(--mono); font-size: 9.5px; color: var(--dim); }
.course-tab.active .ct-count { color: var(--accent); opacity: .8; }

/* ------------------------ workbench (Git: editor + mapa) ------------------------ */
.wb {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 372px;
  gap: 10px;
  align-items: stretch;
  margin-top: 4px;
}
.wb-left { min-width: 0; display: flex; }
.wb-left .term { flex: 1; margin: 0; }
.wb-left .term-out { max-height: 300px; }

.wb-right {
  display: flex;
  flex-direction: column;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #0b1219;
  overflow: hidden;
}
.wb-tabs {
  display: flex;
  gap: 3px;
  padding: 6px;
  background: #0d151d;
  border-bottom: 1px solid var(--line-soft);
}
.wb-tab {
  background: transparent;
  border: none;
  color: var(--dim);
  font-family: var(--sans);
  font-size: 11.5px;
  padding: 5px 10px;
  border-radius: 7px;
  cursor: pointer;
}
.wb-tab:hover { color: var(--text); }
.wb-tab.active { background: #16212c; color: var(--text); }

.wb-pane { display: flex; flex-direction: column; min-height: 0; flex: 1; }
.wb-pane.hidden { display: none; }

.wb-list-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px 4px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--dim);
}
.icon-btn {
  width: 30px; height: 30px;
  display: grid; place-items: center;
  border-radius: 7px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
}
.icon-btn:hover { color: var(--accent); border-color: rgba(94,234,212,.4); }

.file-list {
  list-style: none;
  margin: 0;
  padding: 0 6px 6px;
  max-height: 118px;
  overflow-y: auto;
  border-bottom: 1px solid var(--line-soft);
}
.file-row {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 4px 8px;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11.3px;
  color: #b9c9d8;
}
.file-row:hover { background: #111a23; }
.file-row.active { background: rgba(94,234,212,.08); color: #eaf6f2; }
.fstat { width: 14px; text-align: center; font-weight: 700; color: #6b7f92; }
.fstat.sU { color: var(--warn); }
.fstat.sM { color: #a8b3bd; }
.fstat.sA { color: var(--ok); }
.fstat.sC, .fstat.sD { color: var(--err); }
.file-empty { padding: 10px; color: var(--dim); font-size: 11px; line-height: 1.6; }

.wb-editor { display: flex; flex-direction: column; min-height: 0; flex: 1; }
.edit-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 5px 10px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--muted);
}
.edit-head .fname { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.edit-status { color: var(--warn); font-size: 9.5px; white-space: nowrap; }
.edit-area {
  display: block;
  width: 100%;
  flex: 1;
  min-height: 150px;
  resize: vertical;
  background: #070d13;
  border: none;
  outline: none;
  color: #d7e3ee;
  font-family: var(--mono);
  font-size: 11.8px;
  line-height: 1.6;
  padding: 9px 11px;
  white-space: pre;
  overflow: auto;
  tab-size: 2;
}
.edit-area:disabled { opacity: .45; }
.edit-area.is-missing { color: #ff9a9a; }
.edit-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  padding: 4px 10px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--mono);
  font-size: 9.2px;
  color: var(--dim);
}
.edit-foot .saved { color: var(--ok); }

.graph-box {
  padding: 10px 8px;
  overflow-y: auto;
  overflow-x: hidden;
  max-height: 330px;
  min-height: 190px;
  scrollbar-color: #24323f transparent;
  scrollbar-width: thin;
}
.graph-scroll { overflow-x: auto; scrollbar-width: none; }
.graph-scroll::-webkit-scrollbar { display: none; }
.graph-scroll svg { display: block; max-width: 100%; }
.graph-legend { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 10px; }
.lg {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--mono);
  font-size: 9.5px;
  color: var(--muted);
  background: #111a23;
  border: 1px solid var(--line);
  border-radius: 99px;
  padding: 2px 8px;
}
.lg i { width: 7px; height: 7px; border-radius: 50%; display: block; }
.lg.current { border-color: rgba(94,234,212,.4); color: var(--accent); }
.lg em { color: var(--dim); font-style: normal; }
.graph-empty {
  color: var(--dim);
  font-size: 12px;
  text-align: center;
  padding: 44px 12px;
  line-height: 1.8;
}
.graph-empty span { font-size: 11px; color: #7f92a5; }

/* -------------------------------- SQL lab -------------------------------- */
.sql-lab {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr);
  gap: 12px;
  margin-top: 4px;
}
.sql-schema { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.sql-schema.hidden { display: none; }
.sql-lab.no-schema { grid-template-columns: 1fr; }
.schema-head {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--dim);
  padding-left: 2px;
}
.table-card {
  background: #0f1720;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}
.table-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  padding: 6px 9px;
  background: #121c26;
  border-bottom: 1px solid var(--line-soft);
}
.tname { font-family: var(--mono); font-size: 11px; color: var(--accent); }
.preview-btn {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--dim);
  border-radius: 5px;
  font-family: var(--mono);
  font-size: 9px;
  padding: 1px 6px;
  cursor: pointer;
}
.preview-btn:hover { color: var(--text); border-color: #33506a; }
.col-list { list-style: none; margin: 0; padding: 6px 9px 7px; }
.col-list li {
  display: flex;
  align-items: center;
  gap: 5px;
  font-family: var(--mono);
  font-size: 10.4px;
  padding: 2px 0;
  color: #b9c9d8;
}
.cname { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; }
.ctype { color: #8194a6; font-size: 9px; }
.kbadge { font-style: normal; font-size: 7.5px; padding: 1px 4px; border-radius: 3px; letter-spacing: .04em; }
.kbadge.pk { background: rgba(94,234,212,.12); color: var(--accent); }
.kbadge.fk { background: rgba(167,139,250,.15); color: #c4b5fd; }
.table-refs {
  padding: 0 9px 7px;
  font-family: var(--mono);
  font-size: 9.2px;
  color: #7f92a5;
}

.sql-main { display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.sql-editor { border: 1px solid var(--line); border-radius: 12px; background: #070d13; overflow: hidden; }
.sql-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: #0d151d;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--mono);
  font-size: 10.2px;
  color: var(--dim);
}
.sq-dots { display: flex; gap: 4px; }
.sq-dots i { width: 7px; height: 7px; border-radius: 50%; background: #2b3a49; display: block; }
.sq-dots i:nth-child(1) { background: #f26d6d; }
.sq-dots i:nth-child(2) { background: #e0b03c; }
.sq-dots i:nth-child(3) { background: #51c07a; }
.sql-bar .kbd { margin-left: auto; border: 1px solid var(--line); border-radius: 4px; padding: 1px 5px; font-size: 9px; }
.sql-input {
  display: block;
  width: 100%;
  min-height: 118px;
  resize: vertical;
  background: transparent;
  border: none;
  outline: none;
  color: #cfe9df;
  font-family: var(--mono);
  font-size: 12.6px;
  line-height: 1.7;
  padding: 12px 14px;
  tab-size: 2;
}
.sql-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 8px 12px;
  border-top: 1px solid var(--line-soft);
  background: #0b1219;
}
.sql-actions .spacer { flex: 1; }
.sql-out { border: 1px solid var(--line); border-radius: 12px; background: #0b1219; overflow: hidden; }
.sql-out-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 7px 12px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--mono);
  font-size: 10.2px;
  color: var(--dim);
}
.sql-out-head .rows.bad { color: var(--err); }
.sql-table-wrap { max-height: 260px; overflow: auto; }
.sql-table { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 11.4px; }
.sql-table th {
  position: sticky;
  top: 0;
  background: #121c26;
  color: var(--accent);
  text-align: left;
  padding: 6px 10px;
  font-weight: 500;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.sql-table td {
  padding: 5px 10px;
  border-bottom: 1px solid rgba(31, 44, 57, .55);
  color: #c3d3e0;
  white-space: nowrap;
}
.sql-table tbody tr:nth-child(even) td { background: rgba(255,255,255,.014); }
.sql-table td.is-num { color: #9ae6b4; text-align: right; }
.sql-table td.is-null { color: #8194a6; font-style: italic; }
.sql-table td.no-rows { text-align: center; color: var(--dim); padding: 16px; }
.sql-empty, .sql-mutation { padding: 18px; color: var(--dim); font-size: 12.4px; text-align: center; line-height: 1.6; }
.sql-error { padding: 14px 16px; }
.sql-error strong { display: block; color: var(--err); font-size: 11.5px; margin-bottom: 4px; }
.sql-error p { margin: 0; font-family: var(--mono); font-size: 11.6px; color: #f0b9b9; line-height: 1.6; }
.sql-below { margin-top: 4px; }

/* ------------------------- repaso, progreso, chuleta ------------------------- */
.topbar-actions { display: flex; gap: 6px; margin-left: auto; }
.topbar-actions .ghost-btn { margin-left: 0; white-space: nowrap; }
.badge {
  display: inline-block;
  min-width: 17px;
  padding: 0 4px;
  margin-left: 3px;
  border-radius: 99px;
  background: rgba(94,234,212,.16);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 9.5px;
  text-align: center;
}
.badge.empty { background: var(--line); color: var(--dim); }

body.modal-open { overflow: hidden; }
.overlay {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(4, 7, 10, .78);
  animation: fade .18s ease;
}
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
.modal {
  width: 100%;
  max-width: 640px;
  max-height: 86vh;
  display: flex;
  flex-direction: column;
  background: #0f151d;
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .55);
  overflow: hidden;
  animation: rise .22s ease both;
}
.modal.wide { max-width: 840px; }
.modal > :not(.modal-head) { flex: 1 1 auto; min-height: 0; overflow-y: auto; overscroll-behavior: contain; scrollbar-gutter: stable; scrollbar-width: thin; scrollbar-color: #2a3d4e transparent; }
.modal > :not(.modal-head)::-webkit-scrollbar { width: 8px; }
.modal > :not(.modal-head)::-webkit-scrollbar-thumb { background: #2a3d4e; border-radius: 20px; }
.modal > :not(.modal-head)::-webkit-scrollbar-track { background: transparent; }
.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 18px;
  border-bottom: 1px solid var(--line-soft);
  background: #111922;
}
.modal-head h3 { margin: 0; font-size: 15px; letter-spacing: -0.01em; }
.modal-x {
  width: 36px; height: 36px;
  display: grid;
  place-items: center;
  flex: none;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}
.modal-x:hover { color: var(--text); border-color: #33506a; }

.review, .stats, .cheat {
  overflow-y: auto;
  flex: 1;
  min-height: 0;
  scrollbar-width: thin;
  scrollbar-color: #24323f transparent;
}
.review::-webkit-scrollbar, .stats::-webkit-scrollbar, .cheat::-webkit-scrollbar { width: 8px; }
.review::-webkit-scrollbar-thumb, .stats::-webkit-scrollbar-thumb, .cheat::-webkit-scrollbar-thumb { background: #24323f; border-radius: 20px; }
.review::-webkit-scrollbar-track, .stats::-webkit-scrollbar-track, .cheat::-webkit-scrollbar-track { background: transparent; }
.review { padding: 18px 20px 22px; }
.review-top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--dim);
}
.review-top .bar { flex: 1; height: 5px; border-radius: 99px; background: var(--line); overflow: hidden; }
.review-top .bar i { display: block; height: 100%; background: var(--accent); transition: width .3s; }
.review-count { white-space: nowrap; }
.card-face {
  min-height: 158px;
  padding: 22px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #14161a;
}
.card-tag { font-family: var(--mono); font-size: 9.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); }
.card-front { margin-top: 12px; font-size: 20px; line-height: 1.45; letter-spacing: -0.01em; }
.card-back {
  margin-top: 14px;
  padding: 15px 17px;
  border-radius: 12px;
  background: rgba(94, 234, 212, .05);
  border: 1px solid rgba(94, 234, 212, .16);
  font-size: 14.4px;
  line-height: 1.65;
  color: #d6e4ef;
}
.card-back code { background: #16212c; padding: 1px 5px; border-radius: 4px; font-size: 12.4px; color: #a5f3e6; }
.review-actions { display: flex; align-items: center; gap: 12px; margin-top: 16px; }
.kbd-hint { font-family: var(--mono); font-size: 10px; color: var(--dim); }
.grades { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 16px; }
.grade {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 10px 6px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #111a23;
  color: var(--muted);
  font-family: inherit;
  cursor: pointer;
  transition: .15s ease;
}
.grade strong { font-size: 12.4px; color: var(--text); font-weight: 600; }
.grade span { font-family: var(--mono); font-size: 9.5px; color: var(--dim); }
.grade:hover { border-color: #3a5570; transform: translateY(-1px); }
.grade.g0:hover { border-color: rgba(255, 107, 107, .45); }
.grade.g2:hover { border-color: rgba(94, 234, 212, .45); }
.review-finish { text-align: center; padding: 26px 10px 10px; }
.review-finish .big { font-size: 40px; line-height: 1; color: var(--ok); margin-bottom: 10px; }
.review-finish h4 { margin: 0 0 8px; font-size: 19px; }
.review-finish p { margin: 0 auto 18px; max-width: 48ch; color: var(--muted); font-size: 14px; }
.review-finish .btn { margin: 0 4px; }

.stats { padding: 18px 20px 20px; }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 18px; }
.stat-box { background: #111a23; border: 1px solid var(--line); border-radius: 11px; padding: 10px 12px; }
.stat-box strong { display: block; font-size: 19px; letter-spacing: -0.02em; }
.stat-box span { font-size: 10.5px; color: var(--dim); }
.stat-section { margin-bottom: 16px; }
.stat-section h4 {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--dim);
}
.stat-row {
  display: grid;
  grid-template-columns: 1.4fr 1fr 46px 44px;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  font-size: 12.2px;
  color: #c6d4e0;
}
.sr-bar { height: 5px; border-radius: 99px; background: var(--line); overflow: hidden; }
.sr-bar i { display: block; height: 100%; background: var(--accent); opacity: .75; }
.sr-count, .sr-acc { font-family: var(--mono); font-size: 10.5px; color: var(--dim); text-align: right; }
.stat-note { margin: 0; color: var(--dim); font-size: 12.4px; }
.fail-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  width: 100%;
  margin-bottom: 5px;
  padding: 7px 10px;
  text-align: left;
  background: #111a23;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: #c6d4e0;
  font-family: inherit;
  font-size: 12px;
  cursor: pointer;
}
.fail-row:hover { border-color: #3a5570; }
.fail-name code { color: var(--dim); font-size: 10.5px; }
.fail-meta { font-family: var(--mono); font-size: 10px; color: var(--err); opacity: .85; white-space: nowrap; }
.stat-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--line-soft); }
.btn.danger { color: var(--err); border-color: rgba(255, 107, 107, .25); }

.cheat { padding: 14px 18px 18px; }
.cheat-search {
  width: 100%;
  margin-bottom: 14px;
  padding: 10px 12px;
  background: #0b1219;
  border: 1px solid var(--line);
  border-radius: 9px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 12.5px;
  outline: none;
}
.cheat-search:focus { border-color: rgba(94, 234, 212, .4); }
.cheat-sec { margin-bottom: 16px; }
.cheat-sec h4 {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  opacity: .85;
}
.cheat-row {
  display: grid;
  grid-template-columns: minmax(170px, .95fr) 1.4fr auto;
  gap: 10px;
  align-items: center;
  padding: 5px 0;
  border-bottom: 1px solid rgba(31, 44, 57, .45);
}
.cheat-row code { color: #a5f3e6; font-size: 11.6px; }
.cheat-row span { color: var(--muted); font-size: 12.2px; }
.cheat-row .copy-mini { justify-self: end; }
.copy-mini {
  padding: 2px 6px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 9px;
  cursor: pointer;
}
.copy-mini:hover { color: var(--accent); border-color: rgba(94, 234, 212, .35); }
.cheat-empty { padding: 20px 4px; color: var(--dim); font-size: 13px; }

.order-box { margin-top: 6px; }
.order-pool { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 12px; }
.order-chip {
  padding: 7px 10px;
  background: #111a23;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: #d3e2ee;
  font-family: var(--mono);
  font-size: 11.5px;
  cursor: pointer;
  transition: .14s ease;
  text-align: left;
}
.order-chip:hover:not(:disabled) { border-color: #3a5570; }
.order-chip.used { opacity: .26; }
.order-answer {
  list-style: none;
  margin: 0 0 12px;
  padding: 9px;
  min-height: 56px;
  border: 1px dashed #2a3d4e;
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.order-answer.static { border-style: solid; background: #0f1720; }
.order-answer li {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 6px 9px;
  background: #131d27;
  border: 1px solid var(--line);
  border-radius: 7px;
  font-family: var(--mono);
  font-size: 11.5px;
}
.order-answer li:not(.order-empty) { cursor: pointer; }
.order-answer li:not(.order-empty):hover { border-color: #3a5570; }
.order-answer .num { width: 14px; flex: none; color: var(--accent); font-size: 10px; }
.order-answer .order-empty {
  background: transparent;
  border: none;
  color: var(--dim);
  font-family: inherit;
  font-size: 11.5px;
  cursor: default;
}

.ex.flash { outline: 2px solid rgba(94, 234, 212, .6); outline-offset: 2px; }
.diff-box {
  margin-top: 9px;
  padding: 9px 11px;
  background: rgba(0, 0, 0, .22);
  border: 1px solid rgba(255, 255, 255, .06);
  border-radius: 8px;
}
.diff-row { display: flex; align-items: baseline; gap: 8px; padding: 2px 0; }
.diff-row span {
  min-width: 92px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--dim);
}
.diff-row code { font-size: 11.8px; color: #d6e4ef; }

/* ------------------------------ proyectos ------------------------------ */
.mod-item.project-link { margin-top: 10px; border-top: 1px solid var(--line-soft); padding-top: 14px; border-radius: 0 0 11px 11px; }
.mod-item.project-link .mod-num { color: var(--amber); border-color: rgba(240, 180, 41, .3); background: rgba(240, 180, 41, .07); }

.project {
  margin: 18px 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #14161a;
  overflow: hidden;
}
.project.done { border-color: rgba(70, 196, 110, .35); }
.project-head { padding: 18px 20px 14px; }
.project-title-row { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.project-title-row h3 { margin: 0; font-size: 21px; letter-spacing: -0.02em; }
.project-chips { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.chip-level, .chip-time, .proj-done-chip {
  padding: 3px 8px;
  border-radius: 99px;
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 9.5px;
  color: var(--muted);
  white-space: nowrap;
}
.chip-level { color: var(--accent); border-color: rgba(94, 234, 212, .3); }
.proj-done-chip { color: var(--ok); border-color: rgba(70, 196, 110, .4); background: rgba(70, 196, 110, .08); align-items: center; gap: 4px; }
.project-goal { margin: 10px 0 12px; font-size: 14.5px; color: #cfdae5; }
.project-req { margin: 0 0 12px; }
.project-req > span { font-family: var(--mono); font-size: 9.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--dim); }
.project-req ul { margin: 4px 0 0; font-size: 13px; color: var(--muted); }
.project-progress { display: flex; align-items: center; gap: 10px; }
.proj-count { font-family: var(--mono); font-size: 10.5px; color: var(--dim); white-space: nowrap; }
.proj-bar { flex: 1; height: 5px; border-radius: 99px; background: var(--line); overflow: hidden; }
.proj-bar i { display: block; height: 100%; background: var(--accent); transition: width .3s; }
.project-steps { border-top: 1px solid var(--line-soft); }
.pstep { border-bottom: 1px solid var(--line-soft); }
.pstep:last-child { border-bottom: none; }
.pstep summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  cursor: pointer;
  list-style: none;
}
.pstep summary::-webkit-details-marker { display: none; }
.pstep summary:hover { background: rgba(255, 255, 255, .02); }
.step-check {
  width: 20px; height: 20px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: #0b1219;
  color: var(--ok);
  font-size: 12px;
  cursor: pointer;
}
.pstep.done .step-check { border-color: rgba(70, 196, 110, .5); background: rgba(70, 196, 110, .12); }
.step-num { width: 16px; font-family: var(--mono); font-size: 10.5px; color: var(--dim); }
.step-title { flex: 1; font-size: 14px; color: #d6e4ef; }
.pstep.done .step-title { color: var(--muted); text-decoration: line-through; text-decoration-color: rgba(143, 160, 178, .5); }
.step-time { font-family: var(--mono); font-size: 9.5px; color: var(--dim); white-space: nowrap; }
.pstep-body { padding: 2px 18px 16px 56px; }
.pstep-body p { font-size: 14px; color: #cfdae5; }
.pstep-body pre.code { margin-top: 10px; }
.pstep-body .note { margin-top: 10px; }
.pstep-body ol.clean { font-size: 13.6px; }
.project-extension {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 18px;
  border-top: 1px solid var(--line-soft);
  background: rgba(240, 180, 41, .04);
}
.project-extension .note-k { background: rgba(240, 180, 41, .14); color: var(--amber); }
.project-extension p { margin: 0; font-size: 13px; color: #e5d6ac; }

/* ----------------------------- responsive ----------------------------- */
@media (max-width: 1080px) {
  .shell { grid-template-columns: 260px minmax(0, 1fr); }
  .main { padding: 28px 28px 100px; }
}

@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--line-soft);
    padding: 16px 16px 10px;
    display: block;
  }
  .sidebar-head { padding-bottom: 10px; }
  #moduleList { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 8px; scrollbar-width: none; }
  #moduleList::-webkit-scrollbar { display: none; }
  .mod-item { flex: 0 0 210px; margin: 0; }
  .sidebar-foot { display: none; }
  .main { padding: 22px 18px 90px; }
  .mod-head h2 { font-size: 27px; }
  .zones { grid-template-columns: 1fr; }
  .topbar { gap: 12px; padding: 0 14px; }
  .brand { min-width: auto; }
  .brand-name { display: none; }
  #resetProgress { font-size: 11px; padding: 6px 9px; }
  .topbar-actions { gap: 4px; }
  .topbar-actions .ghost-btn { font-size: 10.5px; padding: 5px 8px; }
  .wb { grid-template-columns: 1fr; }
  .lesson code:not(pre code), .note code, .ex-prompt code, .card-back code {
    white-space: normal;
    overflow-wrap: anywhere;
  }
  .wb-right { min-height: 330px; }
  .sql-lab { grid-template-columns: 1fr; }
  .sql-schema { flex-direction: row; overflow-x: auto; padding-bottom: 4px; scrollbar-width: none; }
  .sql-schema::-webkit-scrollbar { display: none; }
  .table-card { flex: 0 0 auto; min-width: 172px; }
  .schema-head { display: none; }
}

@media (max-width: 640px) {
  pre.code { font-size: 11.8px; padding: 13px 14px; }
  .mod-head h2 { font-size: 25px; }
  .lesson h3 { font-size: 18.5px; }
  .term-out { font-size: 11.4px; max-height: 300px; }
  .term-in { font-size: 12.4px; }
  .ex-body { padding: 14px 13px; }
  .nav-foot { flex-wrap: wrap; }
  .nav-foot .mid { order: 3; width: 100%; text-align: center; }
  .overlay { padding: 10px; }
  .modal { max-height: 92vh; border-radius: 12px; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-row { grid-template-columns: 1.2fr 1fr 40px 38px; gap: 6px; font-size: 11.4px; }
  .cheat-row { grid-template-columns: 1fr auto; gap: 4px; }
  .cheat-row span { grid-column: 1 / -1; font-size: 11.4px; }
  .cheat-row code, .diff-row code { white-space: normal; overflow-wrap: anywhere; }
  .project-title-row h3 { font-size: 18px; }
  .project-head { padding: 14px 14px 12px; }
  .pstep summary { gap: 8px; padding: 9px 12px; }
  .pstep-body { padding: 2px 12px 14px 14px; }
  .grades { grid-template-columns: repeat(2, 1fr); }
  .card-front { font-size: 17px; }
}

@media (max-width: 520px) {
  .topbar-progress .bar { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* selección */
::selection { background: rgba(94,234,212,.22); }