/* ============================================================
 * theme.css — TEMA de la guía de DERIVADAS (capa LIBRE, prefijo dv-).
 * SOLO estilos del tema: leyenda de color, plano cartesiano SVG y widgets por
 * toque (tangente, reglas, pendiente). NO redefine clases `guia-*` (capa bloqueada).
 * Pisos de letra: lectura ≥17px · apoyo ≥15px · etiquetas MAYÚSCULAS ≥13px.
 * Tap targets ≥44px. Sin overflow horizontal a 360px. Light-mode fijo.
 * Color semántico: curva = navy · tangente+punto = naranja · pendiente +/0/− = verde/gris/rojo.
 * ============================================================ */

/* ===== Paleta del tema (eco de las variables de marca) ===== */
.dv-legend, .dv-wg {
  --dv-curve: #283891;  /* la curva (navy) */
  --dv-tan: #C75D08;    /* recta tangente + punto (naranja) */
  --dv-pos: #1C7A3A;    /* pendiente positiva (verde) */
  --dv-neg: #C0392B;    /* pendiente negativa (rojo) */
  --dv-zero: #4b5563;   /* pendiente cero (gris) */
  --dv-ink: #181B22;
  --dv-mut: #4b5563;
  --dv-line: #e7e2da;
  --dv-cream: #FFF3E7;
}

/* ===== Leyenda de color ===== */
.dv-legend {
  display: flex; flex-wrap: wrap; gap: 10px 18px;
  margin: 4px 0 18px; padding: 12px 14px;
  border: 2px solid var(--dv-ink); border-radius: 14px; background: #fff;
}
.dv-legend .it { display: flex; align-items: center; gap: 8px; font-size: 15px; color: var(--dv-mut); line-height: 1.35; }
.dv-legend .it b { color: var(--dv-ink); }
.dv-legend .sw { width: 16px; height: 16px; border-radius: 5px; border: 1.5px solid var(--dv-ink); flex: 0 0 auto; }
.dv-legend .sw.curve { background: var(--dv-curve); }
.dv-legend .sw.tan { background: var(--dv-tan); }
.dv-legend .sw.pos { background: var(--dv-pos); }
.dv-legend .sw.neg { background: var(--dv-neg); }
.dv-legend .sw.zero { background: var(--dv-zero); }

/* ===== SVG del plano cartesiano ===== */
.dv-svg { width: 100%; max-width: 340px; height: auto; display: block; margin: 0 auto; }
.dv-svg-sm { max-width: 280px; }

/* ===== Andamiaje común de widgets ===== */
.dv-wg {
  margin: 16px 0; padding: 16px 14px;
  border: 2px solid var(--dv-ink); border-radius: 16px; background: #fff;
  box-shadow: 4px 4px 0 var(--dv-ink);
}
.dv-wg-top { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 10px; margin-bottom: 12px; }
.dv-flag {
  font-size: 13px; font-weight: 800; letter-spacing: .03em; text-transform: uppercase;
  color: #fff; background: var(--dv-tan); border-radius: 999px; padding: 4px 11px; flex: 0 0 auto;
}
.dv-wg-inst { font-size: 15px; color: var(--dv-mut); line-height: 1.45; }
.dv-wg-inst b { color: var(--dv-ink); }

/* ===== Botones del tema ===== */
.dv-btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: 10px 18px; margin-top: 12px;
  font-size: 16px; font-weight: 800; line-height: 1.2;
  color: #fff; background: var(--dv-tan);
  border: 2px solid var(--dv-ink); border-radius: 12px; cursor: pointer;
  box-shadow: 3px 3px 0 var(--dv-ink);
}
.dv-btn.small { padding: 8px 14px; }
.dv-btn.ghost { color: var(--dv-ink); background: #fff; }
.dv-btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--dv-ink); }

/* ============================================================
 * WIDGET ① — tangente ⭐
 * ============================================================ */
.dv-tan-curve { margin: 0 0 10px; font-size: 17px; font-weight: 700; color: var(--dv-ink); text-align: center; }
.dv-tan-stage { margin: 0 0 12px; }
.dv-slider { display: flex; flex-direction: column; gap: 4px; margin-bottom: 12px; }
.dv-slider-lbl { display: flex; justify-content: space-between; align-items: baseline; font-size: 16px; }
.dv-slider-name { font-weight: 800; color: var(--dv-curve); font-size: 17px; }
.dv-slider-val {
  font-weight: 800; color: var(--dv-ink); font-size: 18px;
  min-width: 44px; text-align: right; font-variant-numeric: tabular-nums;
}
/* Tap target ≥44px: el input mide 44px de alto; la pista visual es de 10px. */
.dv-range {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 44px; border-radius: 999px;
  background: transparent; outline: none; cursor: pointer;
}
.dv-range::-webkit-slider-runnable-track { height: 10px; border-radius: 999px; background: var(--dv-line); }
.dv-range::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--dv-tan); border: 3px solid #fff;
  box-shadow: 0 0 0 2px var(--dv-ink); cursor: pointer;
  margin-top: -12px;
}
.dv-range::-moz-range-track { height: 10px; border-radius: 999px; background: var(--dv-line); }
.dv-range::-moz-range-thumb {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--dv-tan); border: 3px solid #fff;
  box-shadow: 0 0 0 2px var(--dv-ink); cursor: pointer;
}
.dv-range:focus-visible { box-shadow: 0 0 0 3px rgba(199,93,8,.35); }

.dv-tan-read {
  margin: 0; padding: 12px 14px;
  border: 2px solid var(--dv-line); border-radius: 12px; background: #fcfbf9;
  font-size: 17px; color: var(--dv-ink);
}
.dv-tan-slope { margin: 0 0 8px; font-size: 18px; line-height: 1.45; color: var(--dv-ink); }
.dv-tan-list { margin: 0; padding-left: 0; list-style: none; }
.dv-tan-list li { font-size: 17px; line-height: 1.55; color: var(--dv-ink); padding: 2px 0; overflow-x: auto; }
.dv-chip {
  display: inline-block; font-size: 16px; font-weight: 800;
  padding: 1px 10px; border-radius: 999px; color: #fff;
  font-variant-numeric: tabular-nums;
}
.dv-chip.pos { background: var(--dv-pos); }
.dv-chip.neg { background: var(--dv-neg); }
.dv-chip.zero { background: var(--dv-zero); }

/* ============================================================
 * WIDGET ② — reglas
 * ============================================================ */
.dv-reglas-prog { margin: 0 0 10px; font-size: 15px; font-weight: 800; color: var(--dv-mut); }
.dv-reglas-q { margin: 0 0 12px; font-size: 18px; font-weight: 700; color: var(--dv-ink); text-align: center; }
.dv-reglas-q .katex { font-size: 1.05em; }
.dv-reglas-opts { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.dv-reglas-opt {
  flex: 1 1 auto; min-width: 130px; min-height: 52px; padding: 12px 16px;
  font-size: 17px; font-weight: 700; line-height: 1.25;
  color: var(--dv-ink); background: #fff;
  border: 2px solid var(--dv-ink); border-radius: 12px; cursor: pointer;
}
.dv-reglas-opt:active { transform: translateY(1px); }
.dv-reglas-opt.right { background: #E8F5EC; border-color: var(--dv-pos); color: #14532d; }
.dv-reglas-opt.wrong { background: #FDECEC; border-color: var(--dv-neg); color: #7a1f17; }
.dv-reglas-opt:disabled { cursor: default; opacity: .95; }
.dv-reglas-fb { margin-top: 12px; font-size: 17px; line-height: 1.5; }
.dv-reglas-fb:not(.show) { display: none; }
.dv-reglas-fb.show { display: block; padding: 12px 14px; border-radius: 12px; border: 2px solid; }
.dv-reglas-fb.ok { background: #E8F5EC; border-color: var(--dv-pos); color: #14532d; }
.dv-reglas-fb.miss { background: #FDECEC; border-color: var(--dv-neg); color: #7a1f17; }
.dv-reglas-done { margin: 0 0 10px; font-size: 17px; line-height: 1.5; color: var(--dv-ink); }

/* ============================================================
 * WIDGET ③ — pendiente (lector)
 * ============================================================ */
.dv-pend-prog { margin: 0 0 10px; font-size: 15px; font-weight: 800; color: var(--dv-mut); }
.dv-pend-stage { margin: 0 0 10px; }
.dv-pend-q { margin: 0 0 10px; font-size: 18px; font-weight: 800; color: var(--dv-ink); text-align: center; }
.dv-pend-opts { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.dv-pend-opt {
  flex: 1 1 auto; min-width: 120px; min-height: 48px; padding: 12px 14px;
  font-size: 17px; font-weight: 800; line-height: 1.25;
  color: var(--dv-ink); background: #fff;
  border: 2px solid var(--dv-ink); border-radius: 12px; cursor: pointer;
}
.dv-pend-opt:active { transform: translateY(1px); }
.dv-pend-opt.right { background: #E8F5EC; border-color: var(--dv-pos); color: #14532d; }
.dv-pend-opt.wrong { background: #FDECEC; border-color: var(--dv-neg); color: #7a1f17; }
.dv-pend-opt:disabled { cursor: default; opacity: .95; }
.dv-pend-fb { margin-top: 12px; font-size: 17px; line-height: 1.5; }
.dv-pend-fb:not(.show) { display: none; }
.dv-pend-fb.show { display: block; padding: 12px 14px; border-radius: 12px; border: 2px solid; }
.dv-pend-fb.ok { background: #E8F5EC; border-color: var(--dv-pos); color: #14532d; }
.dv-pend-fb.miss { background: #FDECEC; border-color: var(--dv-neg); color: #7a1f17; }
.dv-pend-done { margin: 0 0 10px; font-size: 17px; line-height: 1.5; color: var(--dv-ink); }

/* ===== A ~360px: que nada se desborde ===== */
@media (max-width: 380px) {
  .dv-reglas-opt { min-width: 110px; }
  .dv-pend-opt { min-width: 104px; }
}

/* ===== Movimiento reducido ===== */
@media (prefers-reduced-motion: reduce) {
  .dv-btn, .dv-reglas-opt, .dv-pend-opt { transition: none !important; }
  .dv-btn:active, .dv-reglas-opt:active, .dv-pend-opt:active { transform: none; }
}

/* ===== Impresión: los widgets interactivos no aportan en papel ===== */
@media print {
  .dv-wg { display: none !important; }
}