/* Academia DOMOVE — estilo Nexus con acento azul */
:root {
  --bg: #f4f6fb; --panel: #ffffff; --panel-2: #f1f4f9; --border: #e2e8f0; --border-strong: #cbd5e1;
  --text: #0f172a; --muted: #64748b; --faint: #94a3b8;
  --accent: #2563eb; --accent-hover: #1d4ed8; --accent-soft: rgba(37, 99, 235, .10); --accent-text: #1d4ed8;
  --ok: #16a34a; --ok-soft: rgba(22, 163, 74, .10); --err: #dc2626; --err-soft: rgba(220, 38, 38, .08);
  --warn: #d97706; --warn-soft: rgba(217, 119, 6, .10); --info-soft: rgba(37, 99, 235, .07);
  --sidebar-bg: #0b1220; --sidebar-border: #1a2438; --sidebar-text: #cbd5e1; --sidebar-muted: #64748b;
  --sidebar-hover: rgba(148, 163, 184, .10); --sidebar-active: rgba(59, 130, 246, .20); --sidebar-active-text: #93c5fd;
  --code-bg: #0f172a; --code-text: #e2e8f0; --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 4px 16px rgba(15, 23, 42, .05);
  --radius: 10px; --sidebar-w: 248px;
  color-scheme: light;
}
[data-theme="dark"] {
  --bg: #0a101d; --panel: #111a2e; --panel-2: #0e1627; --border: #1e2a40; --border-strong: #2b3a55;
  --text: #e2e8f0; --muted: #94a3b8; --faint: #64748b;
  --accent: #3b82f6; --accent-hover: #60a5fa; --accent-soft: rgba(59, 130, 246, .16); --accent-text: #93c5fd;
  --ok: #22c55e; --ok-soft: rgba(34, 197, 94, .12); --err: #f87171; --err-soft: rgba(248, 113, 113, .10);
  --warn: #fbbf24; --warn-soft: rgba(251, 191, 36, .10); --info-soft: rgba(59, 130, 246, .10);
  --sidebar-bg: #070c17; --sidebar-border: #151f33;
  --code-bg: #0b1222; --shadow: 0 1px 2px rgba(0, 0, 0, .3);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { background: var(--bg); color: var(--text); font: 15px/1.6 Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; -webkit-font-smoothing: antialiased; }
a { color: var(--accent-text); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font: inherit; }
svg.lucide { width: 18px; height: 18px; stroke-width: 2; flex-shrink: 0; }
code, pre, .mono { font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.muted { color: var(--muted); }
.hidden { display: none !important; }

/* ---------------------------------------------------------------- layout */
.shell { display: flex; height: 100vh; overflow: hidden; }
.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar { height: 56px; flex-shrink: 0; display: flex; align-items: center; gap: 12px; padding: 0 20px;
  border-bottom: 1px solid var(--border); background: var(--panel); }
.topbar h1 { font-size: 16px; font-weight: 600; margin: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar .crumbs { color: var(--muted); font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar .spacer { flex: 1; }
.content { flex: 1; overflow-y: auto; }
.page { max-width: 1120px; margin: 0 auto; padding: 24px 20px 64px; }
.btn.menu-btn { display: none; }

/* ---------------------------------------------------------------- sidebar */
.sidebar { width: var(--sidebar-w); flex-shrink: 0; background: var(--sidebar-bg); color: var(--sidebar-text);
  border-right: 1px solid var(--sidebar-border); display: flex; flex-direction: column; transition: width .18s ease; }
.sidebar .brand { height: 56px; display: flex; align-items: center; gap: 10px; padding: 0 16px; border-bottom: 1px solid var(--sidebar-border); }
.sidebar .brand img { width: 30px; height: 30px; border-radius: 8px; }
.sidebar .brand strong { display: block; color: #fff; font-size: 15px; line-height: 1.1; }
.sidebar .brand span { display: block; color: var(--sidebar-muted); font-size: 11px; }
.sidebar nav { flex: 1; overflow-y: auto; padding: 12px 10px; }
.nav-group { margin-bottom: 14px; }
.nav-group-label { font-size: 10.5px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--sidebar-muted); padding: 6px 10px; }
.nav-item { position: relative; display: flex; align-items: center; gap: 11px; padding: 8px 10px; border-radius: 8px; color: var(--sidebar-text);
  font-size: 14px; cursor: pointer; text-decoration: none; }
.nav-item:hover { background: var(--sidebar-hover); text-decoration: none; }
.nav-item.active { background: var(--sidebar-active); color: var(--sidebar-active-text); }
.nav-item.active::before { content: ""; position: absolute; left: -10px; top: 8px; bottom: 8px; width: 3px; border-radius: 0 3px 3px 0; background: var(--accent); }
.nav-item.disabled { opacity: .45; cursor: default; }
.nav-item .badge { margin-left: auto; font-size: 10px; padding: 1px 7px; border-radius: 99px; background: var(--sidebar-hover); color: var(--sidebar-muted); }
.nav-item .label { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sidebar-foot { border-top: 1px solid var(--sidebar-border); padding: 10px; display: flex; flex-direction: column; gap: 2px; }
.sidebar-user { display: flex; align-items: center; gap: 10px; padding: 8px 10px; }
.avatar { width: 30px; height: 30px; border-radius: 50%; background: var(--accent); color: #fff; display: grid; place-items: center; font-size: 12px; font-weight: 700; flex-shrink: 0; }
.sidebar-user .who { min-width: 0; }
.sidebar-user .who strong { display: block; color: #fff; font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sidebar-user .who span { display: block; color: var(--sidebar-muted); font-size: 11px; }
/* colapsado */
.shell.collapsed .sidebar { width: 68px; }
.shell.collapsed .sidebar .label, .shell.collapsed .sidebar .badge, .shell.collapsed .nav-group-label,
.shell.collapsed .brand > div, .shell.collapsed .sidebar-user .who { display: none; }
.shell.collapsed .nav-item { justify-content: center; }
.shell.collapsed .nav-group { border-top: 1px solid var(--sidebar-border); padding-top: 8px; }
.shell.collapsed .nav-group:first-child { border-top: 0; padding-top: 0; }
.shell.collapsed .nav-item[data-tip]:hover::after { content: attr(data-tip); position: absolute; left: 58px; top: 50%; transform: translateY(-50%);
  background: #1e293b; color: #fff; font-size: 12px; padding: 5px 9px; border-radius: 6px; white-space: nowrap; z-index: 50; box-shadow: var(--shadow); }

/* ---------------------------------------------------------------- componentes */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 7px; height: 36px; padding: 0 14px; border-radius: 8px;
  border: 1px solid var(--border-strong); background: var(--panel); color: var(--text); font-size: 14px; font-weight: 500; cursor: pointer; white-space: nowrap; }
.btn:hover:not(:disabled) { background: var(--panel-2); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover:not(:disabled) { background: var(--accent-hover); }
.btn.success { background: var(--ok); border-color: var(--ok); color: #fff; }
.btn.ghost { border-color: transparent; background: transparent; }
.btn.sm { height: 30px; padding: 0 10px; font-size: 13px; }
.btn.icon { width: 36px; padding: 0; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.card-pad { padding: 18px 20px; }
.grid { display: grid; gap: 16px; }
.grid.cols-3 { grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); }
.row { display: flex; align-items: center; gap: 10px; }
.stack > * + * { margin-top: 12px; }
.chip { display: inline-flex; align-items: center; gap: 5px; font-size: 12px; padding: 2px 9px; border-radius: 99px; background: var(--panel-2); color: var(--muted); border: 1px solid var(--border); }
.chip.ok { background: var(--ok-soft); color: var(--ok); border-color: transparent; }
.chip.warn { background: var(--warn-soft); color: var(--warn); border-color: transparent; }
.chip.accent { background: var(--accent-soft); color: var(--accent-text); border-color: transparent; }
.chip.err { background: var(--err-soft); color: var(--err); border-color: transparent; }
.progress { height: 8px; border-radius: 99px; background: var(--panel-2); overflow: hidden; border: 1px solid var(--border); }
.progress > div { height: 100%; background: var(--accent); border-radius: 99px; transition: width .3s; }
.progress.ok > div { background: var(--ok); }
h2.section-title { font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 28px 0 12px; font-weight: 600; }
.empty { text-align: center; color: var(--muted); padding: 40px 16px; }
.toast { position: fixed; top: 16px; left: 50%; transform: translateX(-50%); z-index: 100; background: #1e293b; color: #fff; padding: 10px 16px;
  border-radius: 8px; font-size: 14px; box-shadow: 0 8px 24px rgba(0,0,0,.2); max-width: 90vw; }
.toast.err { background: #b91c1c; }
input.field, select.field, textarea.field { width: 100%; height: 38px; padding: 0 12px; border-radius: 8px; border: 1px solid var(--border-strong);
  background: var(--panel); color: var(--text); font: inherit; }
input.field:focus, select.field:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
label.lbl { display: block; font-size: 12px; font-weight: 600; color: var(--muted); margin-bottom: 5px; }
table.table { width: 100%; border-collapse: collapse; font-size: 14px; }
table.table th { text-align: left; font-size: 12px; font-weight: 600; color: var(--muted); padding: 10px 12px; border-bottom: 1px solid var(--border); white-space: nowrap; }
table.table td { padding: 11px 12px; border-bottom: 1px solid var(--border); vertical-align: middle; }
table.table tr:last-child td { border-bottom: 0; }
.modal-back { position: fixed; inset: 0; background: rgba(2, 6, 23, .55); z-index: 80; display: grid; place-items: center; padding: 16px; }
.modal { width: 100%; max-width: 640px; max-height: 88vh; overflow-y: auto; }

/* ---------------------------------------------------------------- inicio / ruta */
.hero { padding: 24px; display: flex; gap: 24px; align-items: center; flex-wrap: wrap;
  background: linear-gradient(135deg, var(--accent-soft), transparent 60%), var(--panel); }
.hero h2 { margin: 0 0 4px; font-size: 22px; }
.hero .grow { flex: 1; min-width: 240px; }
.stat { text-align: center; min-width: 90px; }
.stat strong { display: block; font-size: 24px; line-height: 1.2; }
.stat span { font-size: 12px; color: var(--muted); }
.chapter-card { padding: 18px; display: flex; flex-direction: column; gap: 10px; cursor: pointer; transition: border-color .15s, transform .15s; }
.chapter-card:hover { border-color: var(--accent); transform: translateY(-1px); }
.chapter-card .head { display: flex; gap: 12px; align-items: flex-start; }
.chapter-card .ico { width: 40px; height: 40px; border-radius: 10px; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; flex-shrink: 0; }
.chapter-card h3 { margin: 0; font-size: 16px; }
.chapter-card p { margin: 0; color: var(--muted); font-size: 13.5px; }
.route-soon { opacity: .6; }

/* ---------------------------------------------------------------- capítulo */
.chapter { display: grid; grid-template-columns: 270px 1fr; gap: 22px; align-items: start; }
.chapter > * { min-width: 0; }
.toc summary { list-style: none; cursor: pointer; font-size: 12px; color: var(--muted); padding: 0 0 6px 9px; display: flex; align-items: center; gap: 6px; }
.toc-head { display: flex; align-items: center; gap: 6px; flex: 1; min-width: 0; }
.toc-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.toc-toggle { color: var(--muted); }
.toc-item.done .k { color: var(--ok); }
/* índice plegado: columna de iconos (solo escritorio) */
@media (min-width: 901px) {
.chapter.toc-collapsed { grid-template-columns: 58px 1fr; }
.chapter.toc-collapsed .toc { padding: 8px 6px; overflow: visible; }
.chapter.toc-collapsed .toc summary { padding: 0 0 6px; justify-content: center; }
.chapter.toc-collapsed .toc-head, .chapter.toc-collapsed .toc-item .t, .chapter.toc-collapsed .toc-item .st { display: none; }
.chapter.toc-collapsed .toc-item { justify-content: center; padding: 8px 0; position: relative; }
.chapter.toc-collapsed .toc-item.active .k { color: var(--accent-text); }
.chapter.toc-collapsed .toc-item:hover::after { content: attr(data-tip); position: absolute; left: 46px; top: 50%; transform: translateY(-50%);
  background: #1e293b; color: #fff; font-size: 12px; padding: 5px 9px; border-radius: 6px; white-space: nowrap; z-index: 50; box-shadow: var(--shadow); }
.toc summary::-webkit-details-marker { display: none; }
.toc { position: sticky; top: 0; padding: 10px; max-height: calc(100vh - 110px); overflow-y: auto; }
}
.toc-item { display: flex; align-items: center; gap: 9px; padding: 7px 9px; border-radius: 7px; color: var(--text); font-size: 13.5px; cursor: pointer; }
.toc-item:hover { background: var(--panel-2); text-decoration: none; }
.toc-item.active { background: var(--accent-soft); color: var(--accent-text); font-weight: 600; }
.toc-item .k { color: var(--faint); }
.toc-item.done .st { color: var(--ok); }
.toc-item .st { margin-left: auto; color: var(--border-strong); }
.toc-item span.t { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; flex: 1; }
.lesson-body { padding: 26px 30px 30px; }
.kind-tag { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 600; color: var(--accent-text); text-transform: uppercase; letter-spacing: .05em; }
.lesson-body h1 { font-size: 24px; margin: 6px 0 16px; line-height: 1.3; }
.md h1, .md h2, .md h3 { line-height: 1.3; }
.md h2 { font-size: 19px; margin: 26px 0 10px; }
.md h3 { font-size: 16px; margin: 22px 0 8px; }
.md p, .md li { font-size: 15.5px; }
.md code { background: var(--panel-2); border: 1px solid var(--border); padding: 1px 5px; border-radius: 5px; font-size: .88em; }
.md pre { background: var(--code-bg); color: var(--code-text); padding: 14px 16px; border-radius: 9px; overflow-x: auto; font-size: 13.5px; line-height: 1.55; }
.md pre code { background: none; border: 0; padding: 0; color: inherit; font-size: inherit; }
.md table { border-collapse: collapse; margin: 14px 0; font-size: 14px; display: block; overflow-x: auto; }
.md th, .md td { border: 1px solid var(--border); padding: 7px 11px; text-align: left; }
.md th { background: var(--panel-2); }
.md blockquote { margin: 16px 0; padding: 12px 16px; border-left: 4px solid var(--border-strong); background: var(--panel-2); border-radius: 0 8px 8px 0; }
.md blockquote p { margin: 4px 0; }
.md blockquote.c-artesano { border-left-color: var(--accent); background: var(--info-soft); }
.md blockquote.c-warn { border-left-color: var(--warn); background: var(--warn-soft); }
.md blockquote.c-tip { border-left-color: var(--ok); background: var(--ok-soft); }
.lesson-nav { display: flex; justify-content: space-between; gap: 10px; margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--border); flex-wrap: wrap; }

/* bloques ejecutables */
.snippet { margin: 16px 0; border-radius: 10px; overflow: hidden; border: 1px solid var(--border-strong); background: var(--code-bg); }
.snippet-bar { display: flex; align-items: center; gap: 8px; padding: 6px 8px 6px 12px; background: #111b30; color: #94a3b8; font-size: 12px; }
.snippet-bar .spacer { flex: 1; }
.snippet-bar .btn { height: 28px; font-size: 12.5px; background: transparent; color: #cbd5e1; border-color: #334155; }
.snippet-bar .btn.run { background: var(--accent); border-color: var(--accent); color: #fff; }
.output { margin: 0; padding: 10px 14px; background: #060b16; color: #d1fae5; font-size: 13px; white-space: pre-wrap; max-height: 320px; overflow-y: auto; border-top: 1px solid #1e293b; }
.output.err { color: #fecaca; }
.output:empty { display: none; }

/* CodeMirror (siempre oscuro, como un editor) */
.CodeMirror { height: auto; min-height: 60px; background: var(--code-bg); color: var(--code-text); font-size: 13.5px; line-height: 1.55; font-family: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace; }
.editor-lg .CodeMirror { min-height: 280px; }
.CodeMirror-gutters { background: var(--code-bg); border-right: 1px solid #1e293b; }
.CodeMirror-linenumber { color: #475569; }
.CodeMirror-cursor { border-left-color: #e2e8f0; }
.CodeMirror-selected, .CodeMirror-focused .CodeMirror-selected { background: #1e3a8a !important; }
.cm-s-default .cm-keyword { color: #c792ea; } .cm-s-default .cm-def { color: #82aaff; } .cm-s-default .cm-variable-2 { color: #eeffff; }
.cm-s-default .cm-string { color: #c3e88d; } .cm-s-default .cm-number { color: #f78c6c; } .cm-s-default .cm-comment { color: #64748b; font-style: italic; }
.cm-s-default .cm-builtin { color: #89ddff; } .cm-s-default .cm-operator { color: #89ddff; } .cm-s-default .cm-property { color: #ffcb6b; }
.cm-s-default .cm-variable { color: #e2e8f0; } .cm-s-default .cm-meta { color: #ffcb6b; } .cm-s-default .cm-atom { color: #f78c6c; }
.cm-s-default span.cm-error { color: #f87171; }

/* retos */
.challenge-grid { display: grid; gap: 16px; }
.tests { list-style: none; padding: 0; margin: 0; }
.tests li { display: flex; gap: 10px; padding: 10px 12px; border-radius: 8px; margin-bottom: 6px; font-size: 14px; }
.tests li.ok { background: var(--ok-soft); }
.tests li.fail { background: var(--err-soft); }
.tests li .msg { color: var(--muted); font-size: 13px; white-space: pre-wrap; margin-top: 2px; }
.tests li.ok svg { color: var(--ok); } .tests li.fail svg { color: var(--err); }
.hint { padding: 10px 14px; border-radius: 8px; background: var(--warn-soft); margin-top: 8px; font-size: 14px; }
.banner-ok { display: flex; gap: 12px; align-items: center; padding: 14px 16px; border-radius: 10px; background: var(--ok-soft); color: var(--ok); font-weight: 600; }
.py-status { font-size: 12px; color: var(--muted); display: inline-flex; align-items: center; gap: 6px; }
.py-status .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--warn); }
.py-status.ready .dot { background: var(--ok); }
@keyframes spin { to { transform: rotate(360deg); } }
.spin { animation: spin 1s linear infinite; }

/* test de repaso */
.q { padding: 16px 18px; border: 1px solid var(--border); border-radius: 10px; margin-bottom: 12px; }
.q .qtext { font-weight: 600; margin-bottom: 10px; }
.q .qtext pre { font-weight: 400; }
.opt { display: flex; gap: 10px; align-items: flex-start; padding: 8px 10px; border-radius: 8px; cursor: pointer; border: 1px solid transparent; }
.opt:hover { background: var(--panel-2); }
.opt input { margin-top: 5px; accent-color: var(--accent); }
.opt.correct { background: var(--ok-soft); border-color: var(--ok); }
.opt.wrong { background: var(--err-soft); border-color: var(--err); }
.why { font-size: 14px; color: var(--muted); margin-top: 8px; padding-left: 10px; border-left: 3px solid var(--border-strong); }

/* ---------------------------------------------------------------- acceso (login / invitación) */
body.auth { display: grid; place-items: center; min-height: 100vh; padding: 16px; background: radial-gradient(circle at 30% 20%, #13306b 0%, #0b1220 55%); color: #e2e8f0; }
.auth-card { width: min(380px, 100%); background: #0f172a; border: 1px solid #1e2a40; border-radius: 16px; padding: 28px; display: grid; gap: 14px; box-shadow: 0 20px 60px rgba(0,0,0,.4); }
.auth-card h1 { margin: 6px 0 0; font-size: 20px; }
.auth-brand { display: flex; align-items: center; gap: 12px; }
.auth-brand img { border-radius: 10px; }
.auth-brand strong { display: block; font-size: 17px; }
.auth-brand span { display: block; font-size: 12px; color: #94a3b8; }
.auth-card label { display: grid; gap: 6px; font-size: 13px; color: #94a3b8; }
.auth-card input { height: 42px; padding: 0 12px; border-radius: 9px; border: 1px solid #2b3a55; background: #0b1220; color: #e2e8f0; font-size: 15px; }
.auth-card input:focus { outline: 2px solid rgba(59,130,246,.35); border-color: #3b82f6; }
.auth-card button { height: 44px; border: 0; border-radius: 9px; background: #2563eb; color: #fff; font-size: 15px; font-weight: 600; cursor: pointer; }
.auth-card button:hover { background: #1d4ed8; }
.auth-card .err { color: #fca5a5; margin: 0; font-size: 14px; }
.auth-card .muted { color: #94a3b8; font-size: 13px; margin: 0; }

/* ---------------------------------------------------------------- móvil */
@media (max-width: 900px) {
  .chapter { grid-template-columns: 1fr; }
  .toc-toggle { display: none; }
  .toc { position: static; max-height: none; }
  .lesson-body { padding: 20px 18px; }
}
@media (max-width: 760px) {
  .btn.menu-btn { display: inline-flex; }
  .py-status .txt { display: none; }
  .sidebar { position: fixed; z-index: 60; top: 0; bottom: 0; left: 0; transform: translateX(-100%); transition: transform .2s; width: 260px !important; }
  .shell.mobile-open .sidebar { transform: none; }
  .shell.mobile-open::after { content: ""; position: fixed; inset: 0; background: rgba(2,6,23,.5); z-index: 55; }
  .shell.collapsed .sidebar .label, .shell.collapsed .nav-group-label, .shell.collapsed .brand > div, .shell.collapsed .sidebar-user .who { display: block; }
  .page { padding: 16px 14px 48px; }
  .topbar { padding: 0 12px; }
  #collapseBtn { display: none; }
}