/* ============================================================
   components.css — botones, tarjetas, pasos, código, diff
   ============================================================ */

/* ---------- Botones ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-weight: 550;
  transition: background .15s ease, border-color .15s ease, transform .1s ease;
  white-space: nowrap;
}
.btn:hover { background: var(--surface-3); border-color: #35414f; }
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: .38; cursor: not-allowed; pointer-events: none; }

.btn-primary {
  background: var(--accent); border-color: var(--accent); color: #062019; font-weight: 650;
}
.btn-primary:hover { background: #45d9b7; border-color: #45d9b7; }

.btn-ghost { background: transparent; border-color: transparent; color: var(--text-2); }
.btn-ghost:hover { background: var(--surface-2); color: var(--text); }

.btn-sm { padding: 6px 11px; font-size: .82rem; }

.icon-btn {
  display: grid; place-items: center;
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-size: 1rem;
}
.icon-btn:hover { background: var(--surface-3); }

/* ---------- Switch ---------- */
.switch { display: inline-flex; align-items: center; gap: 9px; cursor: pointer; user-select: none; }
.switch input { position: absolute; opacity: 0; width: 0; height: 0; }
.switch-track {
  position: relative; width: 38px; height: 21px;
  background: var(--surface-3); border: 1px solid var(--border);
  border-radius: 99px; transition: background .18s ease, border-color .18s ease;
}
.switch-thumb {
  position: absolute; top: 2px; left: 2px;
  width: 15px; height: 15px; border-radius: 50%;
  background: var(--text-3); transition: transform .18s ease, background .18s ease;
}
.switch input:checked + .switch-track { background: var(--accent-soft); border-color: var(--accent); }
.switch input:checked + .switch-track .switch-thumb { transform: translateX(17px); background: var(--accent); }
.switch input:focus-visible + .switch-track { box-shadow: 0 0 0 3px var(--accent-soft); }
.switch-label { font-size: .84rem; color: var(--text-2); }

/* ---------- Píldoras / etiquetas ---------- */
.chip {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 9px;
  border-radius: 99px;
  font-size: .73rem;
  font-weight: 550;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text-2);
  white-space: nowrap;
}
.chip-accent { background: var(--accent-soft); border-color: rgba(55,201,168,.3); color: var(--accent); }
.chip-amber  { background: var(--amber-soft);  border-color: rgba(240,180,41,.3); color: var(--amber); }
.chip-violet { background: var(--violet-soft); border-color: rgba(155,140,245,.3); color: var(--violet); }
.chip-blue   { background: var(--blue-soft);   border-color: rgba(90,169,247,.3); color: var(--blue); }
.chip-rose   { background: var(--rose-soft);   border-color: rgba(242,119,122,.3); color: var(--rose); }

.chip-row { display: flex; flex-wrap: wrap; gap: 6px; }

/* ---------- Sidebar: item de proyecto ---------- */
.nav-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 10px 12px;
  margin-bottom: 4px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-2);
  transition: background .13s ease, color .13s ease;
}
.nav-item:hover { background: var(--surface); color: var(--text); }
.nav-item.active { background: var(--surface-2); border-color: var(--border); color: var(--text); }

.nav-item-top { display: flex; align-items: center; gap: 9px; }
.nav-num {
  flex: 0 0 auto;
  width: 23px; height: 23px;
  display: grid; place-items: center;
  border-radius: 6px;
  background: var(--surface-3);
  color: var(--text-3);
  font-size: .7rem; font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.nav-item.active .nav-num { background: var(--accent); color: #062019; }
.nav-item.done .nav-num { background: var(--accent-soft); color: var(--accent); }
.nav-title { font-size: .855rem; font-weight: 550; line-height: 1.32; }

.nav-meter { margin: 7px 0 0 32px; height: 3px; background: var(--surface-3); border-radius: 99px; overflow: hidden; }
.nav-meter span { display: block; height: 100%; background: var(--accent); border-radius: 99px; transition: width .3s ease; }
.nav-sub { margin: 5px 0 0 32px; font-size: .71rem; color: var(--text-3); font-variant-numeric: tabular-nums; }

.nav-empty { padding: 18px 12px; color: var(--text-3); font-size: .82rem; }

/* ---------- Home ---------- */
.hero {
  border: 1px solid var(--border-soft);
  background: linear-gradient(150deg, var(--surface) 0%, var(--bg-2) 70%);
  border-radius: var(--radius);
  padding: 28px 30px;
  margin-bottom: 26px;
}
.hero h1 { margin-bottom: .35em; }
.hero p { color: var(--text-2); max-width: 70ch; }
.hero-stats { display: flex; flex-wrap: wrap; gap: 22px; margin-top: 18px; }
.hero-stat strong { display: block; font-size: 1.45rem; color: var(--accent); line-height: 1.1; font-variant-numeric: tabular-nums; }
.hero-stat span { font-size: .76rem; color: var(--text-3); text-transform: uppercase; letter-spacing: .08em; }

.section-title {
  display: flex; align-items: baseline; gap: 10px;
  margin: 30px 0 14px;
}
.section-title h2 { margin: 0; }
.section-title small { color: var(--text-3); font-size: .8rem; }

.grid-proyectos {
  display: grid;
  /* min(290px, 100%) evita que la columna mínima desborde en pantallas
     más estrechas que la propia tarjeta. */
  grid-template-columns: repeat(auto-fill, minmax(min(290px, 100%), 1fr));
  gap: 16px;
}

.card {
  display: flex; flex-direction: column;
  text-align: left;
  padding: 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
  background: var(--surface);
  color: inherit;
  transition: border-color .15s ease, transform .15s ease, background .15s ease;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); background: var(--surface-2); }

.card-head { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.card-num {
  width: 30px; height: 30px; flex: 0 0 auto;
  display: grid; place-items: center;
  border-radius: 8px;
  background: var(--surface-3);
  color: var(--text-2);
  font-weight: 750; font-size: .8rem;
  font-variant-numeric: tabular-nums;
}
.card.completo .card-num { background: var(--accent); color: #062019; }
.card h3 { margin: 0; font-size: 1rem; }

.card-desc { color: var(--text-2); font-size: .865rem; margin-bottom: 14px; flex: 1; }

.card-meta { display: flex; gap: 14px; font-size: .75rem; color: var(--text-3); margin-bottom: 12px; }
.card-meta b { color: var(--text-2); font-weight: 600; }

.card-progress { margin-top: auto; }
.card-progress-bar { height: 5px; background: var(--surface-3); border-radius: 99px; overflow: hidden; margin-bottom: 6px; }
.card-progress-bar span { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--blue)); border-radius: 99px; transition: width .3s ease; }
.card-progress-text { font-size: .73rem; color: var(--text-3); display: flex; justify-content: space-between; }

/* ---------- Cabecera de proyecto ---------- */
.crumbs { display: flex; align-items: center; gap: 8px; font-size: .8rem; color: var(--text-3); margin-bottom: 14px; }
.crumbs a { color: var(--text-2); }
.crumbs span { color: var(--text-3); }

.proj-head {
  border: 1px solid var(--border-soft);
  background: var(--surface);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-bottom: 20px;
}
.proj-head h1 { font-size: 1.45rem; margin-bottom: .3em; }
.proj-head > p { color: var(--text-2); margin-bottom: 14px; }
.proj-head-meta { display: flex; flex-wrap: wrap; gap: 10px 22px; font-size: .8rem; color: var(--text-3); margin-bottom: 14px; }
.proj-head-meta b { color: var(--text-2); font-weight: 600; }

/* ---------- Barra de progreso del tutorial ---------- */
.step-bar {
  position: sticky;
  top: var(--topbar-h);
  z-index: 20;
  background: rgba(14,17,22,.93);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 20px;
}
.step-bar-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 9px; }
.step-counter { font-size: .85rem; font-weight: 600; color: var(--text); font-variant-numeric: tabular-nums; }
.step-counter em { font-style: normal; color: var(--accent); }
.step-bar-actions { display: flex; align-items: center; gap: 8px; }

.step-track { height: 6px; background: var(--surface-3); border-radius: 99px; overflow: hidden; }
.step-track span { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--blue)); border-radius: 99px; transition: width .3s ease; }

.step-dots { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 11px; }
.step-dot {
  width: 24px; height: 24px;
  display: grid; place-items: center;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text-3);
  font-size: .68rem; font-weight: 700;
  font-variant-numeric: tabular-nums;
  transition: all .13s ease;
}
.step-dot:hover { border-color: var(--accent); color: var(--text); }
.step-dot.done { background: var(--accent-soft); border-color: rgba(55,201,168,.35); color: var(--accent); }
.step-dot.current { background: var(--accent); border-color: var(--accent); color: #062019; }

/* ---------- Bloques pedagógicos ---------- */
.step-title { font-size: 1.28rem; margin-bottom: 16px; }
.step-title .step-kicker {
  display: block;
  font-size: .72rem; text-transform: uppercase; letter-spacing: .12em;
  color: var(--text-3); font-weight: 600; margin-bottom: 6px;
}

.block {
  border: 1px solid var(--border-soft);
  border-left: 3px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  margin-bottom: 14px;
}
.block > h4 {
  display: flex; align-items: center; gap: 8px;
  font-size: .72rem; text-transform: uppercase; letter-spacing: .12em;
  color: var(--text-3); margin-bottom: 9px; font-weight: 700;
}
.block > :last-child { margin-bottom: 0; }
.block p, .block li { color: var(--text-2); }
.block strong { color: var(--text); font-weight: 600; }

.block-objetivo    { border-left-color: var(--accent); }
.block-objetivo h4 { color: var(--accent); }
.block-concepto    { border-left-color: var(--violet); }
.block-concepto h4 { color: var(--violet); }
.block-accion      { border-left-color: var(--amber); }
.block-accion h4   { color: var(--amber); }
.block-resultado   { border-left-color: var(--blue); }
.block-resultado h4{ color: var(--blue); }
.block-check       { border-left-color: var(--accent-2); background: var(--accent-soft); border-color: rgba(55,201,168,.22); }
.block-check h4    { color: var(--accent); }

.concepto-nombre {
  display: inline-block;
  background: var(--violet-soft);
  border: 1px solid rgba(155,140,245,.3);
  color: var(--violet);
  border-radius: 6px;
  padding: 2px 9px;
  font-weight: 650;
  font-size: .82rem;
  margin-bottom: 8px;
}

/* ---------- Bloque de código ---------- */
.code-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #0b0f14;
  margin-bottom: 14px;
}
.code-head {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 12px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  font-size: .74rem;
  color: var(--text-3);
}
.code-lang {
  text-transform: uppercase; letter-spacing: .1em; font-weight: 700; font-size: .68rem;
  color: var(--text-2);
}
.code-head-actions { margin-left: auto; display: flex; gap: 6px; }
.code-head-actions .btn { padding: 4px 10px; font-size: .74rem; }

pre.code {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  line-height: 1.62;
  tab-size: 2;
  color: #cdd8e4;
}
pre.code code { font-size: .845rem; }

/* Sintaxis */
.tok-kw   { color: var(--syn-kw); font-weight: 600; }
.tok-fn   { color: var(--syn-fn); }
.tok-str  { color: var(--syn-str); }
.tok-num  { color: var(--syn-num); }
.tok-com  { color: var(--syn-com); font-style: italic; }
.tok-op   { color: var(--syn-op); }
.tok-type { color: var(--syn-type); }
.tok-punc { color: #8b98a8; }

/* Diff
   El contenedor colapsa el espacio en blanco entre líneas (cada línea es un
   bloque propio) y cada línea vuelve a preservarlo para respetar la indentación. */
.code-diff pre.code { white-space: normal; }
.code-diff .dl { display: block; padding: 0 18px; margin: 0 -18px; white-space: pre; }
.code-diff .dl-add { background: rgba(55,201,168,.12); box-shadow: inset 3px 0 0 var(--accent); }
.code-diff .dl-del { background: rgba(242,119,122,.11); box-shadow: inset 3px 0 0 var(--rose); }
.code-diff .dl-del code { opacity: .72; }
.diff-legend { display: flex; gap: 14px; font-size: .72rem; color: var(--text-3); padding: 8px 14px; border-top: 1px solid var(--border); background: var(--surface-2); }
.diff-legend b { font-weight: 600; }
.diff-legend .lg-add b { color: var(--accent); }
.diff-legend .lg-del b { color: var(--rose); }

/* ---------- Modo aprender ---------- */
.aprender-panel {
  border: 1px dashed rgba(240,180,41,.4);
  background: var(--amber-soft);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  margin-bottom: 14px;
}
.aprender-panel h4 {
  display: flex; align-items: center; gap: 8px;
  font-size: .72rem; text-transform: uppercase; letter-spacing: .12em;
  color: var(--amber); margin-bottom: 10px; font-weight: 700;
}
.aprender-panel p { color: var(--text-2); font-size: .88rem; }
.aprender-editor {
  width: 100%;
  min-height: 130px;
  resize: vertical;
  padding: 12px 14px;
  background: #0b0f14;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: #cdd8e4;
  font-family: var(--mono);
  font-size: .845rem;
  line-height: 1.6;
  outline: none;
  margin-bottom: 10px;
}
.aprender-editor:focus { border-color: var(--amber); box-shadow: 0 0 0 3px var(--amber-soft); }
.aprender-actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.aprender-pista {
  margin-top: 12px;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: .86rem;
  color: var(--text-2);
}

/* ---------- Navegación de pasos ---------- */
.step-nav {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--border-soft);
}
.step-nav .spacer { flex: 1; }

.step-done-toggle { display: flex; align-items: center; gap: 8px; font-size: .84rem; color: var(--text-2); cursor: pointer; user-select: none; }
.step-done-toggle input { accent-color: var(--accent); width: 16px; height: 16px; cursor: pointer; }

/* ---------- Fin de proyecto ---------- */
.finale {
  border: 1px solid rgba(55,201,168,.3);
  background: var(--accent-soft);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-top: 24px;
}
.finale h3 { color: var(--accent); }
.finale p { color: var(--text-2); }

/* ---------- Fuente ---------- */
.fuente {
  font-size: .73rem;
  color: var(--text-3);
  margin-top: 18px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
}
.fuente code { color: var(--text-2); }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translate(-50%, 18px);
  background: var(--surface-3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 18px;
  border-radius: 99px;
  font-size: .85rem;
  box-shadow: 0 12px 34px rgba(0,0,0,.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
  z-index: 60;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- Tablas ---------- */
.tabla-wrap { overflow-x: auto; margin-bottom: 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); }
table.datos { width: 100%; border-collapse: collapse; font-size: .82rem; }
table.datos th, table.datos td { padding: 8px 12px; text-align: left; border-bottom: 1px solid var(--border-soft); }
table.datos th { background: var(--surface-2); color: var(--text-2); font-weight: 600; font-size: .74rem; text-transform: uppercase; letter-spacing: .06em; }
table.datos td { color: var(--text-2); font-family: var(--mono); font-size: .78rem; }
table.datos tr:last-child td { border-bottom: none; }

@media (max-width: 620px) {
  .step-bar-actions .btn span { display: none; }
  .step-nav { flex-direction: column; align-items: stretch; }
  .step-nav .btn { justify-content: center; }
  .hero-stats { gap: 16px; }
}