/* PandasQuest · Red de Subte
   Placas de señalética esmaltadas, líneas de color fijas y un mapa de red como corazón. */

/* ============ Tokens ============ */
:root {
  --l0: #e0700b; --l1: #0098cc; --l2: #d8231b; --l3: #1d5bb0; --l4: #00825a; --l5: #7a2d8f; --l6: #f0bf00;

  --ground: #f0efeb;
  --panel: #fbfaf8;
  --panel-2: #e6e5e0;
  --ink: #0e1a2b;
  --ink-2: #334155;
  --ink-3: #5a6576;
  --rule: #d8d7d1;
  --rule-strong: #b5b4ac;
  --plaque: #0e1a2b;
  --plaque-2: #16263c;
  --plaque-ink: #ffffff;
  --plaque-mute: #b9c4d3;
  --plaque-ok: #7fdca8;
  --plaque-lamp: #52c792;
  --map-bg: #ffffff;
  --station: #ffffff;
  --rail: #8a93a0;
  --ok: #0a7a4c;
  --ok-soft: #e2f1e8;
  --err: #b3261e;
  --err-soft: #fbe8e6;
  --warn: #7a5200;
  --warn-soft: #fbf0d6;
  --info-soft: #e6eef9;
  --focus: #1d5bb0;
  --code-bg: #f8f9fb;
  --code-gutter: #eef1f4;
  --sel: rgba(29, 91, 176, .2);
  --shadow: 0 1px 2px rgba(14, 26, 43, .06), 0 8px 24px -12px rgba(14, 26, 43, .18);
  --radius: 10px;
  --radius-sm: 6px;
  --font: "Overpass", "Segoe UI", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
  --tk-kw: #7a2d8f; --tk-str: #0a7a4c; --tk-num: #b35500; --tk-com: #7b8594;
  --tk-def: #1d5bb0; --tk-op: #b3261e; --tk-var: #0e1a2b; --tk-builtin: #8a5a00;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --l0: #f08222; --l1: #19aee0; --l2: #ef4137; --l3: #4b86e0; --l4: #1fae7c; --l5: #a45dbd; --l6: #f5cc2a;
  --ground: #0b1422;
  --panel: #111d2e;
  --panel-2: #172538;
  --ink: #edf1f6;
  --ink-2: #c6cfdb;
  --ink-3: #93a0b2;
  --rule: #213146;
  --rule-strong: #30455f;
  --plaque: #050b14;
  --plaque-2: #0f1b2c;
  --plaque-ink: #ffffff;
  --plaque-mute: #a7b3c4;
  --map-bg: #0e192a;
  --station: #0e192a;
  --rail: #5d6a7c;
  --ok: var(--plaque-lamp);
  --ok-soft: rgba(82, 199, 146, .12);
  --err: #ff8d84;
  --err-soft: rgba(255, 141, 132, .1);
  --warn: #f5cc2a;
  --warn-soft: rgba(245, 204, 42, .1);
  --info-soft: rgba(75, 134, 224, .12);
  --focus: #6ea4ff;
  --code-bg: #0c1727;
  --code-gutter: #0f1b2d;
  --sel: rgba(110, 164, 255, .28);
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px -12px rgba(0, 0, 0, .6);
  --tk-kw: #d29cf0; --tk-str: var(--plaque-ok); --tk-num: #ffb46b; --tk-com: #75839a;
  --tk-def: #82b4ff; --tk-op: #ff9d95; --tk-var: #edf1f6; --tk-builtin: #f5cc2a;
  color-scheme: dark;
}

/* ============ Base ============ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
html, body { margin: 0; }
body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  background: var(--ground);
  color: var(--ink);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; }
button { font: inherit; color: inherit; cursor: pointer; }
h1, h2, h3, h4 { line-height: 1.15; margin: 0; letter-spacing: -.01em; text-wrap: balance; }
p { margin: 0; }
::selection { background: var(--sel); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
* { scrollbar-width: thin; scrollbar-color: var(--rule-strong) transparent; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--rule-strong); border-radius: 10px; border: 2px solid var(--ground); }
::-webkit-scrollbar-track { background: transparent; }
.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.ic { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.ic.fill { fill: currentColor; stroke: none; }
.hidden { display: none !important; }
.num { font-variant-numeric: tabular-nums; }
.sep { display: inline-block; width: 4px; height: 4px; border-radius: 50%; background: currentColor; opacity: .6; vertical-align: middle; margin: -2px 8px 0; font-size: 0; }
code, pre, kbd { font-family: var(--mono); }
.wrap { max-width: 1320px; margin: 0 auto; padding: 0 24px; }

/* ============ Barra superior: placa de estación ============ */
.topbar { position: sticky; top: 0; z-index: 30; background: var(--plaque); color: var(--plaque-ink); }
.topbar-in { max-width: 1320px; margin: 0 auto; padding: 10px 24px; display: flex; align-items: center; gap: 22px; min-height: 60px; }
.network-stripe { height: 4px; background: linear-gradient(90deg,
  var(--l0) 0 14.28%, var(--l1) 0 28.57%, var(--l2) 0 42.85%, var(--l3) 0 57.14%,
  var(--l4) 0 71.42%, var(--l5) 0 85.71%, var(--l6) 0); }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; flex: none; color: var(--l6); }
.logo-mark { width: 34px; height: 34px; }
.logo-mark text { font: 800 17px var(--font); fill: var(--plaque); }
.logo-text { font-weight: 600; font-size: 19px; letter-spacing: -.01em; color: var(--plaque-ink); }
.logo-text b { font-weight: 800; }

.instruments { display: flex; align-items: stretch; gap: 0; margin-left: auto; }
.inst { display: flex; align-items: center; gap: 10px; padding: 4px 16px; border-left: 1px solid rgba(255, 255, 255, .14); background: none; border-top: 0; border-right: 0; border-bottom: 0; color: inherit; text-align: left; }
.inst:first-child { border-left: 0; }
button.inst { border-radius: 0; }
button.inst:hover .lvl-name { color: #fff; }
.inst-k { font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--plaque-mute); white-space: nowrap; }
.inst-k b { color: var(--plaque-ink); font-size: 15px; letter-spacing: 0; }
.inst-v { display: flex; flex-direction: column; gap: 5px; min-width: 128px; }
.lvl-name { font-size: 13px; font-weight: 600; color: var(--plaque-mute); white-space: nowrap; }
.xpbar { display: block; height: 5px; border-radius: 3px; background: rgba(255, 255, 255, .14); overflow: hidden; }
.xpbar i { display: block; height: 100%; width: 100%; background: var(--l6); border-radius: 3px; transform-origin: left; transform: scaleX(.03); transition: transform .6s cubic-bezier(.22, 1, .36, 1); }
.inst-r { display: flex; align-items: baseline; gap: 4px; font-variant-numeric: tabular-nums; font-size: 13px; color: var(--plaque-mute); white-space: nowrap; }
.inst-r b { color: var(--plaque-ink); font-size: 16px; font-weight: 700; }
.inst-r small { font-size: 11px; margin-left: 6px; font-weight: 600; }
.xp-trend { color: var(--plaque-ok); }
.streak .ic { color: var(--l0); width: 19px; height: 19px; }
.streak-state.pending { color: var(--l6); }
.streak-state.done { color: var(--plaque-ok); }
.ticks { display: inline-flex; gap: 3px; }
.ticks i { width: 9px; height: 16px; border-radius: 2px; background: rgba(255, 255, 255, .16); transition: background .3s; }
.ticks i.on { background: var(--plaque-lamp); }
.combo .ic { color: var(--l6); }
.combo.bump { animation: bump .5s cubic-bezier(.22, 1, .36, 1); }
@keyframes bump { 40% { transform: scale(1.15); } }

.top-tools { display: flex; align-items: center; gap: 6px; flex: none; }
.py-status { display: flex; align-items: center; gap: 8px; font-size: 12px; font-weight: 600; color: var(--plaque-mute); padding: 0 10px; white-space: nowrap; }
.lamp { width: 8px; height: 8px; border-radius: 50%; background: var(--l6); box-shadow: 0 0 0 3px rgba(245, 204, 42, .18); }
.py-status.ready .lamp { background: var(--plaque-lamp); box-shadow: 0 0 0 3px rgba(82, 199, 146, .18); animation: none; }
.py-status.error .lamp { background: #ff6b61; box-shadow: 0 0 0 3px rgba(255, 107, 97, .2); animation: none; }
.icon-btn { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 8px; border: 1px solid rgba(255, 255, 255, .14); background: transparent; color: var(--plaque-ink); }
.icon-btn:hover { background: rgba(255, 255, 255, .08); }

/* ============ Botones ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 42px; padding: 0 18px; border-radius: var(--radius-sm);
  border: 1px solid var(--rule-strong); background: var(--panel); color: var(--ink);
  font-weight: 700; font-size: 15px; text-decoration: none; white-space: nowrap;
  transition: background .15s, border-color .15s, transform .15s;
}
.btn:hover { border-color: var(--ink-3); }
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: .45; cursor: not-allowed; transform: none; }
.btn.primary { background: var(--ink); border-color: var(--ink); color: var(--ground); }
.btn.primary:hover { background: var(--ink-2); border-color: var(--ink-2); }
.btn.line { background: var(--c); border-color: var(--c); color: var(--c-ink, #fff); }
.btn.line:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; border-color: transparent; }
.btn.ghost:hover { background: var(--panel-2); }
.btn.small { min-height: 34px; padding: 0 12px; font-size: 14px; }
.btn .ic { width: 17px; height: 17px; }
.kbd { font: 600 11px var(--mono); padding: 2px 6px; border-radius: 4px; background: rgba(255, 255, 255, .18); }
.btn:not(.line):not(.primary) .kbd { background: var(--panel-2); }

/* ============ Insignia de línea ============ */
.badge-line { --s: 30px; width: var(--s); height: var(--s); flex: none; border-radius: 50%; display: grid; place-items: center; background: var(--c); color: var(--c-ink, #fff); font-weight: 800; font-size: calc(var(--s) * .42); font-variant-numeric: tabular-nums; letter-spacing: -.02em; box-shadow: 0 0 0 2px var(--panel); }
.badge-line.lg { --s: 64px; box-shadow: 0 0 0 4px var(--panel); }

/* ============ Vistas ============ */
main { padding: 28px 0 64px; }
.view { animation: enter .35s cubic-bezier(.22, 1, .36, 1); }
@keyframes enter { from { opacity: 0; transform: translateY(6px); } }
.crumbs { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--ink-3); margin-bottom: 14px; flex-wrap: wrap; }
.crumbs a { text-decoration: none; font-weight: 600; color: var(--ink-2); }
.crumbs a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ---------- Inicio ---------- */
.home-grid { display: grid; grid-template-columns: 340px 1fr; gap: 20px; align-items: start; }
.next-plaque { background: var(--plaque); color: var(--plaque-ink); border-radius: var(--radius); padding: 22px 22px 20px; position: sticky; top: 88px; box-shadow: var(--shadow); }
.np-label { display: flex; align-items: center; gap: 10px; font-size: 13px; font-weight: 600; color: var(--plaque-mute); }
.np-label .badge-line { box-shadow: 0 0 0 2px var(--plaque); }
.np-title { font-size: 30px; font-weight: 800; letter-spacing: -.02em; margin: 16px 0 8px; line-height: 1.1; }
.np-meta { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; font-size: 14px; color: var(--plaque-mute); padding-bottom: 16px; border-bottom: 1px solid rgba(255, 255, 255, .14); }
.np-meta b { color: var(--plaque-ink); font-variant-numeric: tabular-nums; }
.np-sec { font-size: 14px; color: var(--plaque-mute); margin: 14px 0 18px; }
.np-sec b { color: var(--plaque-ink); font-weight: 600; }
.np-actions { display: grid; gap: 8px; }
.np-actions .btn { width: 100%; min-height: 48px; font-size: 16px; }
.np-actions .btn.primary { background: var(--c); border-color: var(--c); color: var(--c-ink, #fff); }
.np-actions .btn.primary:hover { filter: brightness(1.08); background: var(--c); }
.np-actions .btn:not(.primary) { background: transparent; border-color: rgba(255, 255, 255, .22); color: var(--plaque-ink); }
.np-actions .btn:not(.primary):hover { background: rgba(255, 255, 255, .07); }
.np-total { margin-top: 18px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: rgba(255, 255, 255, .12); border-radius: var(--radius-sm); overflow: hidden; }
.np-total div { background: var(--plaque-2); padding: 10px 12px; }
.np-total b { display: block; font-size: 20px; font-variant-numeric: tabular-nums; }
.np-total span { font-size: 12px; color: var(--plaque-mute); }

.map-card { background: var(--map-bg); border: 1px solid var(--rule); border-radius: var(--radius); padding: 18px 18px 8px; box-shadow: var(--shadow); min-width: 0; }
.map-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 4px; flex-wrap: wrap; }
.map-head h1 { font-size: 26px; font-weight: 800; letter-spacing: -.02em; }
.map-head p { color: var(--ink-3); font-size: 14px; }
.netmap { width: 100%; display: block; }
.netmap text { font-family: var(--font); }
.netmap .lbl { font-weight: 700; font-size: 14px; fill: var(--ink); }
.netmap .lbl-n { font-weight: 600; font-size: 13px; fill: var(--ink-3); font-variant-numeric: tabular-nums; }
.netmap .bnum { font-weight: 800; font-size: 11px; }
.netmap a { cursor: pointer; }
.netmap a:focus-visible { outline: none; }
.netmap a:focus-visible .st { stroke: var(--focus); stroke-width: 4; }
.netmap .st { transition: r .2s; }
.netmap a:hover .st { r: 8; }
.netmap .lblink:hover .lbl { text-decoration: underline; }
.map-legend { display: flex; flex-wrap: wrap; gap: 8px 22px; padding: 12px 4px 10px; border-top: 1px solid var(--rule); margin-top: 6px; font-size: 13px; color: var(--ink-3); }
.map-legend span { display: inline-flex; align-items: center; gap: 8px; }
.lg-dot { width: 13px; height: 13px; border-radius: 50%; border: 3px solid var(--ink-3); background: var(--station); }
.lg-dot.done { background: var(--ink-3); }
.lg-train { width: 20px; height: 11px; border-radius: 3px; background: var(--ink); position: relative; }
.lg-xfer { width: 22px; height: 13px; border-radius: 7px; border: 2.5px solid var(--ink-3); background: var(--station); }

.home-lower { display: grid; grid-template-columns: 340px 1fr; gap: 20px; margin-top: 20px; }
.panel { background: var(--panel); border: 1px solid var(--rule); border-radius: var(--radius); }
.sec-h { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; margin-bottom: 14px; }
.sec-h h2 { font-size: 19px; font-weight: 800; }
.sec-h span { font-size: 13px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.how { padding: 20px 22px; }
.how ol { margin: 0; padding: 0; list-style: none; display: grid; gap: 14px; }
.how li { display: grid; grid-template-columns: 26px 1fr; gap: 12px; align-items: start; font-size: 15px; color: var(--ink-2); }
.how li b { color: var(--ink); display: block; }
.how .step-dot { width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; background: var(--panel-2); color: var(--ink); font-weight: 800; font-size: 13px; }
.pins-wrap { padding: 20px 22px; }
.pins { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 2px 18px; }
.pins-h { font-size: 13px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); margin: 18px 0 4px; }
.sec-h + .pins-h { margin-top: 0; }
.pins-empty { color: var(--ink-3); font-size: 15px; }
.pins-more { margin-top: 16px; border-top: 1px solid var(--rule); padding-top: 12px; }
.pins-more summary { cursor: pointer; font-weight: 700; font-size: 14px; color: var(--ink-2); }
.pins-more .pins { margin-top: 8px; }
.pin { display: grid; grid-template-columns: 38px 1fr; gap: 10px; align-items: center; padding: 8px 0; }
.pin-mark { width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center; font-weight: 800; font-size: 12px; border: 3px solid var(--c, var(--ink-3)); color: var(--ink); font-variant-numeric: tabular-nums; }
.pin b { display: block; font-size: 13px; line-height: 1.25; }
.pin small { display: block; font-size: 12px; color: var(--ink-3); line-height: 1.3; }
.pin.locked b { color: var(--ink-2); }
.pin.locked .pin-mark { border-style: dashed; border-color: var(--rule-strong); color: var(--ink-3); }
.pin.unlocked .pin-mark { background: var(--c, var(--ink)); border-color: var(--c, var(--ink)); color: var(--c-ink, var(--ground)); }
.foot { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 36px; padding-top: 18px; border-top: 1px solid var(--rule); font-size: 14px; color: var(--ink-3); }
.foot a { color: var(--ink-2); font-weight: 600; }
.reset-link { background: none; border: 0; padding: 0; color: var(--ink-3); text-decoration: underline; text-underline-offset: 3px; font-size: 14px; }
.reset-link:hover { color: var(--err); }

/* ---------- Módulo: diagrama de línea ---------- */
.line-head { display: grid; grid-template-columns: auto 1fr auto; gap: 22px; align-items: center; background: var(--panel); border: 1px solid var(--rule); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.line-head h1 { font-size: 36px; font-weight: 800; letter-spacing: -.02em; }
.line-head p { color: var(--ink-2); margin-top: 8px; max-width: 62ch; }
.line-head .actions { display: flex; flex-direction: column; gap: 8px; }
.line-prog { display: flex; align-items: center; gap: 12px; margin-top: 14px; font-size: 14px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.line-prog .bar { flex: 1; max-width: 320px; height: 6px; border-radius: 3px; background: var(--panel-2); overflow: hidden; }
.line-prog .bar i { display: block; height: 100%; background: var(--c); border-radius: 3px; }
.line-body { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 32px; align-items: start; margin-top: 26px; }
.line-summary { position: sticky; top: 88px; background: var(--panel); border: 1px solid var(--rule); border-radius: var(--radius); padding: 18px 20px; }
.line-summary h2 { font-size: 16px; font-weight: 800; margin-bottom: 10px; }
.line-summary ul { list-style: none; margin: 0 0 14px; padding: 0; }
.line-summary li { display: flex; justify-content: space-between; gap: 12px; padding: 7px 0; border-bottom: 1px solid var(--rule); font-size: 14px; color: var(--ink-2); }
.line-summary li b { color: var(--ink); }
.line-summary li.done b { color: var(--ok); }
.line-summary p { font-size: 14px; color: var(--ink-3); }
.stops { list-style: none; margin: 0; padding: 0; }
.stop-zone { display: grid; grid-template-columns: 44px 1fr; align-items: center; }
.stop-zone h2 { font-size: 13px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); padding: 18px 0 8px; }
.stop-zone .trk { align-self: stretch; justify-self: center; width: 8px; background: var(--c); }
.stop-zone.first .trk { background: linear-gradient(var(--ground) 50%, var(--c) 50%); }
.stop { display: grid; grid-template-columns: 44px 1fr; align-items: stretch; }
.stop .trk { position: relative; justify-self: center; width: 8px; background: var(--c); }
.stop:last-child .trk { background: linear-gradient(var(--c) 50%, transparent 50%); }
.stop .dot { position: absolute; left: 50%; top: 50%; width: 20px; height: 20px; transform: translate(-50%, -50%); border-radius: 50%; background: var(--station); border: 4px solid var(--c); }
.stop.solved .dot { background: var(--c); }
.stop.solved .dot::after { content: ""; position: absolute; inset: 3px; border-radius: 50%; background: var(--station); transform: scale(.35); }
.stop.next .dot { width: 26px; height: 26px; border-width: 5px; box-shadow: 0 0 0 4px color-mix(in srgb, var(--c) 25%, transparent); }
.stop a { display: grid; grid-template-columns: 1fr auto auto; gap: 14px; align-items: center; padding: 11px 14px; margin: 3px 0 3px 8px; border-radius: 8px; text-decoration: none; }
.stop a:hover { background: var(--panel); box-shadow: inset 0 0 0 1px var(--rule); }
.stop .t { font-weight: 600; font-size: 16px; }
.stop .t small { display: block; font-weight: 600; font-size: 12px; color: var(--ink-3); }
.stop.solved .t small { color: var(--ok); }
.stop.next .t small { color: var(--ink); }
.xp-tag { font-size: 13px; font-weight: 700; color: var(--ink-3); font-variant-numeric: tabular-nums; min-width: 52px; text-align: right; }
.lvl { font-size: 12px; font-weight: 700; padding: 3px 8px; border-radius: 4px; background: var(--panel-2); color: var(--ink-2); white-space: nowrap; }
.lvl-3 { background: var(--warn-soft); color: var(--warn); }
.lvl-4 { background: var(--err-soft); color: var(--err); }
.line-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 28px; }

/* ---------- Ejercicio ---------- */
.station-sign { background: var(--plaque); color: var(--plaque-ink); border-radius: var(--radius); padding: 18px 22px 16px; box-shadow: var(--shadow); }
.ss-top { display: flex; align-items: center; gap: 14px; }
.ss-top .badge-line { --s: 44px; box-shadow: 0 0 0 3px var(--plaque); }
.ss-title { min-width: 0; flex: 1; }
.ss-line { font-size: 13px; font-weight: 600; color: var(--plaque-mute); display: flex; gap: 8px; flex-wrap: wrap; }
.ss-line a { color: var(--plaque-mute); text-decoration: none; }
.ss-line a:hover { color: #fff; text-decoration: underline; }
.ss-title h1 { font-size: 28px; font-weight: 800; letter-spacing: -.02em; margin-top: 2px; }
.ss-meta { display: flex; gap: 8px; align-items: center; flex: none; }
.ss-meta .lvl { background: rgba(255, 255, 255, .1); color: var(--plaque-ink); }
.ss-meta .xp-tag { color: var(--plaque-ink); }
.state-tag { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 700; padding: 3px 9px; border-radius: 4px; background: rgba(82, 199, 146, .16); color: var(--plaque-ok); }
.state-tag .ic { width: 14px; height: 14px; stroke-width: 2.6; }
.strip { position: relative; margin: 18px 6px 4px; height: 34px; }
.strip-track { position: absolute; left: 0; right: 0; top: 20px; height: 6px; border-radius: 3px; background: var(--c); }
.strip-st { position: absolute; top: 23px; width: 14px; height: 14px; margin: -7px 0 0 -7px; border-radius: 50%; background: var(--plaque); border: 3px solid var(--c); display: block; transition: background .4s; }
.strip-st.solved { background: var(--c); }
.strip-st.current { width: 18px; height: 18px; margin: -9px 0 0 -9px; background: #fff; border-width: 4px; }
.strip-st:hover { transform: scale(1.25); }
.train { position: absolute; top: 0; left: 0; width: 26px; height: 12px; margin-left: -13px; border-radius: 3px 3px 2px 2px; background: #fff; transition: transform .7s cubic-bezier(.22, 1, .36, 1); }
.train::before { content: ""; position: absolute; left: 4px; right: 4px; top: 3px; height: 4px; border-radius: 1px; background: var(--plaque); }
.train::after { content: ""; position: absolute; left: 50%; bottom: -5px; margin-left: -4px; border: 4px solid transparent; border-top-color: #fff; border-bottom: 0; }
.ss-ends { display: flex; justify-content: space-between; gap: 12px; margin-top: 6px; font-size: 13px; color: var(--plaque-mute); }
.ss-ends a { color: var(--plaque-mute); text-decoration: none; display: inline-flex; align-items: center; gap: 6px; max-width: 48%; }
.ss-ends a span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ss-ends a:hover { color: #fff; }
.ss-ends .ic { width: 15px; height: 15px; flex: none; }

.ex-grid > * { min-width: 0; }
.ex-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr); gap: 20px; margin-top: 20px; align-items: start; }
.lesson { padding: 4px 4px 0 0; background: none; border: 0; }
.workspace { display: flex; flex-direction: column; gap: 14px; position: sticky; top: 84px; }

/* Markdown de teoría */
.md { font-size: 16.5px; line-height: 1.65; color: var(--ink-2); max-width: 68ch; }
.md > * + * { margin-top: 14px; }
.md b { color: var(--ink); font-weight: 700; }
.md code { font-size: .86em; padding: 1px 5px; border-radius: 4px; background: var(--panel-2); color: var(--ink); }
.md pre { margin: 14px 0; padding: 14px 16px; border-radius: 8px; background: var(--code-bg); border: 1px solid var(--rule); overflow-x: auto; font-size: 14px; line-height: 1.6; }
.md pre code { padding: 0; background: none; font-size: inherit; }
.md ul, .md ol { padding-left: 22px; }
.md li + li { margin-top: 4px; }
.md-table { overflow-x: auto; border: 1px solid var(--rule); border-radius: 8px; }
.md-table table { border-collapse: collapse; width: 100%; font-size: 14.5px; }
.md-table th { text-align: left; background: var(--panel-2); color: var(--ink); font-weight: 700; padding: 8px 12px; }
.md-table td { padding: 8px 12px; border-top: 1px solid var(--rule); vertical-align: top; }
.callout { display: grid; grid-template-columns: 22px 1fr; gap: 10px; padding: 12px 2px; border-top: 1px solid var(--rule-strong); border-bottom: 1px solid var(--rule-strong); color: var(--ink); font-size: 15px; }
.callout .ic { width: 20px; height: 20px; margin-top: 1px; color: var(--l3); }
.callout.warn .ic { color: var(--warn); }
.callout.work .ic { color: var(--ok); }
.callout .c-lbl { font-weight: 800; margin-right: 4px; }
.mission { margin-top: 26px; padding: 18px 20px; border-radius: 8px; background: var(--plaque); color: var(--plaque-ink); }
:root[data-theme="dark"] .mission { background: var(--plaque-2); box-shadow: inset 0 0 0 1px var(--rule-strong); }
.mission h2 { display: flex; align-items: center; gap: 8px; font-size: 16px; font-weight: 800; margin-bottom: 8px; color: var(--plaque-ink); }
.mission h2 .ic { color: var(--c); }
.mission .md, .mission .md b { color: var(--plaque-ink); }
.mission .md code { background: rgba(255, 255, 255, .12); color: var(--plaque-ink); }
.tools { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.help-box { margin-top: 14px; padding: 14px 16px; border-radius: 8px; border: 1px solid var(--rule); background: var(--panel); font-size: 15px; }
.help-box .hb-h { display: flex; align-items: center; gap: 8px; font-weight: 800; margin-bottom: 8px; }
.help-box pre { margin: 8px 0 0; padding: 12px 14px; border-radius: 6px; background: var(--code-bg); border: 1px solid var(--rule); overflow-x: auto; font-size: 14px; white-space: pre-wrap; }
.help-box .fine { color: var(--ink-3); font-size: 13px; margin-top: 8px; }
.help-box .row { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; align-items: center; }

/* Editor */
.editor-card { overflow: hidden; }
.editor-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 8px 8px 8px 14px; border-bottom: 1px solid var(--rule); background: var(--panel-2); }
.file-tab { display: inline-flex; align-items: center; gap: 8px; font: 600 13px var(--mono); color: var(--ink-2); }
.file-tab i { width: 9px; height: 9px; border-radius: 50%; background: var(--c); }
.editor-actions { display: flex; gap: 6px; }
#editor .CodeMirror { height: auto; min-height: 220px; font: 14.5px/1.65 var(--mono); background: var(--code-bg); color: var(--tk-var); }
#editor .CodeMirror-scroll { min-height: 220px; max-height: 58vh; }
.CodeMirror-gutters { background: var(--code-gutter); border-right: 1px solid var(--rule); }
.CodeMirror-linenumber { color: var(--ink-3); }
.CodeMirror-cursor { border-left: 2px solid var(--ink); }
.CodeMirror-selected, .CodeMirror-focused .CodeMirror-selected { background: var(--sel) !important; }
.CodeMirror-matchingbracket { color: var(--ink) !important; background: var(--sel); outline: none; }
.cm-err-line { background: var(--err-soft); }
.cm-keyword { color: var(--tk-kw); font-weight: 600; }
.cm-string, .cm-string-2 { color: var(--tk-str); }
.cm-number { color: var(--tk-num); }
.cm-comment { color: var(--tk-com); font-style: italic; }
.cm-def { color: var(--tk-def); }
.cm-operator { color: var(--tk-op); }
.cm-variable, .cm-variable-2, .cm-property { color: var(--tk-var); }
.cm-builtin { color: var(--tk-builtin); }
.cm-atom { color: var(--tk-num); }

/* Salida */
.output { overflow: hidden; }
.out-head { display: flex; justify-content: space-between; padding: 10px 16px; border-bottom: 1px solid var(--rule); font-size: 13px; font-weight: 700; color: var(--ink-3); letter-spacing: .02em; }
.out-head #outInfo { font-variant-numeric: tabular-nums; font-weight: 600; }
.run-bar { height: 3px; background: transparent; }
.run-bar.running { background: linear-gradient(90deg, transparent, var(--c), transparent); background-size: 40% 100%; background-repeat: no-repeat; animation: runbar 1.1s linear infinite; }
@keyframes runbar { from { background-position: -40% 0; } to { background-position: 140% 0; } }
.out-body { padding: 16px; max-height: 64vh; overflow: auto; }
.placeholder { text-align: center; padding: 26px 10px; color: var(--ink-3); font-size: 15px; }
.placeholder .ph-ic { width: 36px; height: 36px; margin: 0 auto 10px; border-radius: 50%; display: grid; place-items: center; background: var(--panel-2); color: var(--c, var(--ink-2)); }
.verdict { display: grid; grid-template-columns: 36px 1fr; gap: 12px; padding: 14px 16px; border-radius: 8px; margin-bottom: 14px; }
.verdict .v-ic { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; }
.verdict .v-ic .ic { width: 20px; height: 20px; stroke-width: 2.4; }
.verdict.ok { background: var(--ok-soft); }
.verdict.ok .v-ic { background: var(--ok); color: var(--ground); }
.verdict.bad { background: var(--err-soft); }
.verdict.bad .v-ic { background: var(--err); color: var(--ground); }
.verdict.bad.nudge .v-ic { background: var(--warn); }
.verdict.bad.nudge { background: var(--warn-soft); }
.verdict h3 { font-size: 16px; font-weight: 800; display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.verdict p { margin-top: 4px; font-size: 15px; color: var(--ink-2); }
.verdict code { font-size: 13px; background: var(--panel); padding: 1px 5px; border-radius: 4px; word-break: break-word; }
.verdict .tip { margin-top: 8px; }
.xp-gain { font-size: 14px; font-weight: 800; color: var(--ok); font-variant-numeric: tabular-nums; }
.next-row { margin-top: 12px; display: flex; gap: 8px; flex-wrap: wrap; }
.line-done { margin-top: 12px; padding: 10px 12px; border-radius: 6px; background: var(--panel); display: flex; gap: 10px; align-items: center; font-size: 14px; }
.sql-eq { margin: 0 0 14px; border: 1px solid var(--rule); border-radius: 8px; }
.sql-eq summary { cursor: pointer; padding: 10px 14px; font-weight: 700; font-size: 14px; display: flex; align-items: center; gap: 8px; list-style: none; }
.sql-eq summary::-webkit-details-marker { display: none; }
.sql-eq summary .ic { color: var(--ink-3); }
.sql-eq pre { margin: 0; padding: 12px 14px; border-top: 1px solid var(--rule); background: var(--code-bg); font-size: 13.5px; overflow-x: auto; border-radius: 0 0 8px 8px; }
.label { font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); margin: 14px 0 8px; }
.stdout, pre.val { margin: 0; padding: 12px 14px; border-radius: 6px; background: var(--code-bg); border: 1px solid var(--rule); font-size: 13.5px; line-height: 1.55; overflow-x: auto; white-space: pre; }
.plot { background: #fff; border-radius: 8px; border: 1px solid var(--rule); padding: 8px; margin-bottom: 8px; }
.plot img { display: block; max-width: 100%; height: auto; margin: 0 auto; }
.table-wrap { overflow: auto; max-height: 420px; border: 1px solid var(--rule); border-radius: 8px; }
table.df { border-collapse: collapse; font: 13px/1.4 var(--mono); width: max-content; min-width: 100%; font-variant-numeric: tabular-nums; }
table.df th, table.df td { padding: 6px 12px; text-align: right; border-bottom: 1px solid var(--rule); white-space: nowrap; }
table.df thead th { position: sticky; top: 0; background: var(--panel-2); color: var(--ink); font-weight: 600; z-index: 1; }
table.df tbody th { color: var(--ink-3); font-weight: 600; text-align: left; background: var(--panel); }
table.df tbody tr:hover td { background: var(--panel-2); }
.shape { font-size: 12px; color: var(--ink-3); margin-top: 6px; font-variant-numeric: tabular-nums; }

/* Diálogo */
.dlg { border: 0; padding: 0; background: transparent; max-width: min(860px, calc(100vw - 32px)); width: 100%; color: var(--ink); }
.dlg::backdrop { background: rgba(5, 11, 20, .55); }
.dlg[open] { animation: enter .25s cubic-bezier(.22, 1, .36, 1); }
.dlg-card { background: var(--panel); border-radius: var(--radius); box-shadow: 0 30px 80px -20px rgba(0, 0, 0, .5); padding: 22px; max-height: calc(100vh - 64px); overflow: auto; }
.dlg-top { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 14px; }
.dlg-top h2 { font-size: 20px; font-weight: 800; }
.tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.tab { padding: 6px 12px; border-radius: 6px; border: 1px solid var(--rule); background: var(--panel); font: 600 13px var(--mono); }
.tab.on { background: var(--ink); color: var(--ground); border-color: var(--ink); }
.dtypes { font-size: 13px; color: var(--ink-3); margin-bottom: 10px; line-height: 1.5; }
.dtypes b { color: var(--ink); }
.levels { list-style: none; margin: 0; padding: 0; }
.levels li { display: grid; grid-template-columns: 34px 1fr auto; gap: 12px; align-items: center; padding: 10px 4px; border-bottom: 1px solid var(--rule); }
.levels .ln { width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; font-weight: 800; font-size: 13px; border: 2px solid var(--rule-strong); color: var(--ink-3); }
.levels li.got .ln { background: var(--ink); border-color: var(--ink); color: var(--ground); }
.levels li.cur { font-weight: 800; }
.levels .xp-tag { min-width: 70px; }

/* Toasts */
.toasts { position: fixed; right: 18px; bottom: 18px; display: flex; flex-direction: column; gap: 10px; z-index: 60; pointer-events: none; }
.toast { display: grid; grid-template-columns: 34px 1fr; gap: 12px; align-items: center; min-width: 260px; max-width: 360px; padding: 12px 16px 12px 12px; border-radius: 8px; background: var(--plaque); color: var(--plaque-ink); box-shadow: 0 16px 40px -12px rgba(0, 0, 0, .45); animation: toastIn .35s cubic-bezier(.22, 1, .36, 1); pointer-events: auto; }
.toast.out { opacity: 0; transform: translateY(8px); transition: .3s; }
.toast .t-ic { width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; background: var(--c, var(--l6)); color: var(--c-ink, #1a1400); font-weight: 800; font-size: 12px; }
.toast .t-ic .ic { width: 18px; height: 18px; }
.toast b { display: block; font-size: 14px; }
.toast small { display: block; font-size: 13px; color: var(--plaque-mute); }
@keyframes toastIn { from { opacity: 0; transform: translateY(10px); } }
.float-xp { position: fixed; z-index: 70; font-weight: 800; font-size: 18px; color: var(--ok); pointer-events: none; animation: floatUp 1.3s cubic-bezier(.22, 1, .36, 1) forwards; font-variant-numeric: tabular-nums; }
@keyframes floatUp { to { transform: translateY(-46px); opacity: 0; } }

/* ============ Responsive ============ */
@media (max-width: 1180px) {
  .lvl-name, .inst-v { display: none; }
  .instruments .inst { padding: 4px 12px; }
}
@media (max-width: 1040px) {
  .home-grid, .home-lower { grid-template-columns: 1fr; }
  .next-plaque { position: static; }
  .ex-grid { grid-template-columns: minmax(0, 1fr); }
  .line-body { grid-template-columns: minmax(0, 1fr); }
  .line-summary { position: static; order: -1; }
  .workspace { position: static; }
  .py-status .txt { display: none; }
}
@media (max-width: 720px) {
  .wrap { padding: 0 16px; }
  main { padding-top: 18px; }
  .topbar-in { padding: 8px 16px; gap: 10px; flex-wrap: wrap; }
  .logo-text { font-size: 17px; }
  .logo-mark { width: 30px; height: 30px; }
  .instruments { order: 3; width: 100%; margin: 0; justify-content: space-between; border-top: 1px solid rgba(255, 255, 255, .12); padding-top: 6px; }
  .instruments .inst { padding: 2px 8px; }
  .inst .u { display: none; }
  .top-tools { margin-left: auto; }
  .icon-btn { width: 34px; height: 34px; }
  .np-title { font-size: 25px; }
  .map-card { padding: 14px 10px 6px; }
  .map-head h1 { font-size: 21px; }
  .line-head { grid-template-columns: auto 1fr; padding: 18px; gap: 14px; }
  .line-head .badge-line.lg { --s: 48px; }
  .line-head h1 { font-size: 26px; }
  .line-head .actions { grid-column: 1 / -1; flex-direction: row; flex-wrap: wrap; }
  .stop a { grid-template-columns: 1fr auto; }
  .stop .lvl { display: none; }
  .ss-top { flex-wrap: wrap; }
  .ss-title h1 { font-size: 22px; }
  .ss-line > :not(:nth-child(3)) { display: none; }
  .ss-meta { width: 100%; }
  .lesson { padding: 18px 16px; }
  .editor-actions .kbd { display: none; }
  #resetCode { font-size: 0; gap: 0; padding: 0 10px; }
  #resetCode .ic { font-size: 14px; }
  .md { font-size: 16px; }
  .toasts { left: 12px; right: 12px; bottom: 12px; }
  .toast { min-width: 0; max-width: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}