/* ============================================================
 * theme.css — TEMA de la guía de SISTEMAS DE ECUACIONES (capa LIBRE).
 * SOLO estilos del tema (prefijo sis-): leyenda de color, el sistema
 * llaveado, visuales SVG (rectas / casos / comprobar / cruz / pair) y
 * los 3 widgets por toque (solver / rectas / elige-metodo).
 * Andamiaje en assets/guia-components.css; variables --guia-*.
 * Color semántico (eco de theme.js): x = naranja profundo · y / lo que
 * mueves = navy · lo que se cancela = gris tachado · solución = verde.
 * Pisos de letra: lectura ≥17px · apoyo ≥15px · etiquetas MAYÚSCULAS ≥13px.
 * Tap targets ≥44px. Sin overflow horizontal a 360px. Light-mode fijo.
 * ============================================================ */

/* ===== Paleta del tema (eco de los hex de theme.js / marca) ===== */
.sis-legend, .sis-visual, .sis-sys, .sis-solver, .sis-rectas, .sis-elige {
  --sis-x: var(--guia-deep, #C75D08);          /* incógnita x (XC) */
  --sis-y: var(--guia-navy, #283891);          /* y / lo que mueves (YC) */
  --sis-sol: var(--guia-green-deep, #1C7A3A);  /* la solución / el cruce (SOL) */
  --sis-canc: #9aa3af;                         /* lo que se cancela (CANC) */
  --sis-bad: #A01243;                          /* error / caso NINGUNA */
}

/* ===== Reaseguro de longitud en el hero ===== */
.guia-reassure { font-size: 15px; line-height: 1.5; color: var(--guia-muted); margin: 2px 0 0; }

/* ===== Leyenda de color ===== */
.sis-legend {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px;
  background: #fff; border: 1.5px solid var(--guia-line); border-radius: 12px;
  padding: 10px 14px; font-size: 15px; font-weight: 600;
}
.sis-legend .it { display: flex; align-items: center; gap: 8px; }
.sis-legend .it b { font-weight: 800; }
.sis-legend .sw { width: 16px; height: 16px; border-radius: 5px; border: 1.5px solid var(--guia-ink); flex: 0 0 auto; }
.sis-legend .sw.x { background: var(--sis-x); }
.sis-legend .sw.y { background: var(--sis-y); }
.sis-legend .sw.canc { background: var(--sis-canc); }
.sis-legend .sw.sol { background: var(--sis-sol); }

/* ===== Visual estático (SVG propio + caption) ===== */
.sis-visual { display: flex; flex-direction: column; align-items: center; gap: 6px; margin: 2px 0; }
.sis-visual .vcap { font-size: 15px; font-weight: 700; color: var(--guia-muted); text-align: center; max-width: 44ch; }
/* Ancho RESUELTO (viewBox + max-width): el dibujo nunca colapsa ni desborda. */
.sis-svg { width: 100%; max-width: 300px; height: auto; display: block; margin: 0 auto; }

/* Comparativa de dos figuras lado a lado */
.sis-pair { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.sis-pair figure { margin: 0; display: flex; flex-direction: column; align-items: center; gap: 4px; }
.sis-pair .sis-svg { max-width: 210px; }
.sis-pair figcaption { font-size: 15px; font-weight: 700; color: var(--guia-muted); text-align: center; max-width: 24ch; }

/* Visual dentro de un ejercicio (guiado / serie): más compacto */
.guia-pitem .sis-visual { align-items: flex-start; margin: 8px 0 4px; }
.guia-pitem .sis-visual .vcap { text-align: left; }
.guia-pitem .sis-svg { max-width: 196px; margin: 0; }
.guia-serie-grid .sis-svg { max-width: 168px; }
.guia-pitem .sis-pair { justify-content: flex-start; }
.guia-pitem .sis-pair .sis-svg, .guia-serie-grid .sis-pair .sis-svg { max-width: 140px; }

/* ===== El sistema llaveado (texto coloreado, fuera de SVG) ===== */
.sis-sys { display: inline-flex; align-items: center; gap: 8px; }
.sis-brace { align-self: stretch; display: flex; align-items: center; }
.sis-brace::before { content: "{"; font-size: 52px; font-weight: 300; line-height: .9; color: var(--guia-ink); }
.sis-sys-eqs { display: grid; gap: 3px; }
.sis-sys-row { font-size: 19px; font-weight: 700; letter-spacing: .01em; white-space: nowrap; color: var(--guia-ink); }
.sis-sys-row.sis-faint { color: var(--guia-muted); opacity: .8; }
.sis-x { color: var(--sis-x); font-weight: 800; }
.sis-y { color: var(--sis-y); font-weight: 800; }
.sis-z { color: var(--guia-muted); font-weight: 800; }

/* El sistema fijo arriba del solver / del elige-metodo */
.sis-sys-fixed { justify-self: start; background: #fff; border: 1.5px solid var(--guia-line); border-radius: 12px; padding: 10px 16px; max-width: 100%; overflow-x: auto; }

/* ===== Caja común de los widgets por toque ===== */
.sis-solver, .sis-rectas, .sis-elige {
  display: grid; gap: 12px; padding: 16px;
  border: 2px solid var(--guia-ink); border-radius: 14px; background: var(--guia-cream);
  margin: 2px 0;
}
.sis-lab-top { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.sis-flag { font-size: 13px; font-weight: 800; text-transform: uppercase; letter-spacing: .04em; color: #fff; background: var(--guia-orange); border: 2px solid var(--guia-ink); border-radius: 999px; padding: 3px 11px; flex: 0 0 auto; }
.sis-inst { font-size: 15px; line-height: 1.45; font-weight: 700; color: var(--guia-deep); }

/* Botones del tema (sticker buttons, mismo lenguaje que el motor) */
.sis-btn {
  font: inherit; font-weight: 700; font-size: 15px; min-height: 44px; padding: 9px 16px;
  border: 2px solid var(--guia-ink); border-radius: 10px; background: #fff; color: var(--guia-ink);
  cursor: pointer; box-shadow: 2px 2px 0 var(--guia-ink); transition: transform .1s, box-shadow .1s;
}
.sis-btn:hover { transform: translate(-1px, -1px); box-shadow: 3px 3px 0 var(--guia-ink); }
.sis-btn:active { transform: translate(0, 0); box-shadow: 1px 1px 0 var(--guia-ink); }
.sis-btn.mini { padding: 8px 12px; }
.sis-ctrl { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

/* ===== Widget ① — Solver por toque ===== */
.sis-tabs { display: flex; gap: 8px; flex-wrap: wrap; }
.sis-tab {
  font: inherit; font-weight: 700; font-size: 15px; min-height: 44px; padding: 8px 15px;
  border: 2px solid var(--guia-ink); border-radius: 999px; background: #fff; color: var(--guia-ink);
  cursor: pointer; box-shadow: 2px 2px 0 var(--guia-ink); transition: transform .1s, box-shadow .1s;
}
.sis-tab:hover { transform: translate(-1px, -1px); box-shadow: 3px 3px 0 var(--guia-ink); }
.sis-tab.on { background: var(--sis-y); border-color: var(--sis-y); color: #fff; box-shadow: none; transform: none; }

.sis-steps { display: grid; gap: 8px; }
.sis-step { display: grid; gap: 8px; background: #fff; border: 1.5px solid var(--guia-line); border-radius: 12px; padding: 12px 14px; }
.sis-step.solved { background: #fcfbf9; }
.sis-step.solved .sis-step-trace { color: var(--guia-muted); }
.sis-step.active { border: 2px solid var(--sis-y); }       /* azul = te toca */
.sis-step.result { border: 2px solid var(--sis-sol); background: rgba(28, 122, 58, .07); }
.sis-step-trace { margin: 0; font-size: 17px; font-weight: 700; color: var(--guia-ink); }
.sis-step-show { margin: 0; font-size: clamp(18px, 2.1vw, 21px); font-weight: 800; color: var(--guia-ink); overflow-x: auto; }
.sis-step-show .x { color: var(--sis-x); }
.sis-step-show .y { color: var(--sis-y); }
.sis-step-show .c { color: var(--sis-canc); text-decoration: line-through; text-decoration-thickness: 2px; }

.sis-moves { display: flex; gap: 8px; flex-wrap: wrap; }
.sis-move {
  font: inherit; font-weight: 700; font-size: 17px; min-height: 44px; padding: 9px 16px;
  border: 2px solid var(--guia-ink); border-radius: 10px; background: #fff; color: var(--guia-ink);
  cursor: pointer; box-shadow: 2px 2px 0 var(--guia-ink); transition: transform .1s, box-shadow .1s;
}
.sis-move:hover { transform: translate(-1px, -1px); box-shadow: 3px 3px 0 var(--guia-ink); }
.sis-move.right { background: rgba(28, 122, 58, .14); border-color: var(--sis-sol); color: var(--sis-sol); box-shadow: 2px 2px 0 var(--sis-sol); }
.sis-move.wrong { background: rgba(160, 18, 67, .08); border-color: var(--sis-bad); color: var(--sis-bad); box-shadow: 2px 2px 0 var(--sis-bad); }
.sis-move-fb { margin: 0; font-size: 15px; line-height: 1.5; font-weight: 600; }
.sis-move-fb:empty { display: none; }
.sis-move-fb.ok { color: var(--sis-sol); }
.sis-move-fb.miss { color: var(--guia-deep); }

.sis-sol { margin: 0; font-size: 19px; font-weight: 800; color: var(--guia-ink); }
.sis-sol .sol { color: var(--sis-sol); }
.sis-check { margin: 0; font-size: 17px; line-height: 1.5; font-weight: 600; color: var(--guia-ink); }

/* ===== Widget ② — Explorador de rectas ===== */
.sis-stage { text-align: center; }
.sis-stage .sis-svg { max-width: 300px; }
.sis-read { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.sis-read.center { justify-content: center; }
.sis-type { font-size: 15px; font-weight: 800; letter-spacing: .04em; padding: 4px 14px; border-radius: 999px; border: 2px solid var(--guia-ink); background: #fff; }
.sis-type.is-unica { color: var(--sis-sol); border-color: var(--sis-sol); }
.sis-type.is-inf { color: var(--sis-y); border-color: var(--sis-y); }
.sis-type.is-none { color: var(--sis-bad); border-color: var(--sis-bad); }
.sis-extra { margin: 0; font-size: 16px; line-height: 1.5; font-weight: 600; color: var(--guia-ink); text-align: center; max-width: 52ch; justify-self: center; }
.sis-preset.on { background: var(--sis-y); border-color: var(--sis-y); color: #fff; box-shadow: none; transform: none; }

/* ===== Widget ③ — ¿Qué método me conviene? ===== */
.sis-pista { margin: 0; font-size: 17px; line-height: 1.55; font-weight: 600; color: var(--guia-ink); background: #fff; border: 1.5px solid var(--guia-line); border-radius: 12px; padding: 10px 14px; }

/* ===== Impresión: oculta los widgets interactivos ===== */
@media print {
  .sis-solver, .sis-rectas, .sis-elige { display: none !important; }
}