/* sections.css */
.sections-area { display: flex; flex-direction: column; gap: 0; }

.form-section { overflow: hidden; }

/* ── Cerrado: tarjeta blanca con sombra ──────────────── */
.section__header {
  display: flex; align-items: center;
  cursor: pointer; user-select: none;
  background: var(--c-bg);
  border-top: 1px solid var(--c-line);
  border-left: 4px solid transparent;
  transition: border-color 0.15s, background 0.15s;
  min-height: 48px;
}
.section__header:hover {
  background: var(--c-accent-lt);
  border-left-color: var(--c-accent);
}

/* ── Abierto: borde izquierdo grueso cyan ───────────── */
.form-section.open > .section__header {
  background: var(--c-accent-lt);
  border-left-color: var(--c-accent);
  border-top-color: var(--c-accent-md);
}
.form-section.open > .section__header .sec-num   { color: var(--c-accent-dk); }
.form-section.open > .section__header .sec-title { color: var(--c-ink); }

/* Número */
.sec-num {
  font-family: var(--ff-num);
  font-size: 11px; color: var(--c-ink-4);
  min-width: 52px; padding: 0 8px 0 14px;
  display: flex; align-items: center; justify-content: center;
  transition: color 0.15s; flex-shrink: 0;
}

/* Título */
.sec-title {
  font-family: var(--ff-title);
  font-size: 12px; font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--c-ink-2); flex: 1; padding: 0 12px;
  transition: color 0.15s;
}

.sec-chevron {
  width: 44px; height: 48px;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.sec-chevron svg { transition: transform 0.25s; color: var(--c-ink-4); }
.form-section.open .sec-chevron svg { transform: rotate(180deg); color: var(--c-accent-dk); }

/* Cuerpo */
.section__body {
  max-height: 0; overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4,0,0.2,1);
  background: var(--c-sec-bg);
  border-left: 4px solid var(--c-accent);
}
.form-section.open .section__body { max-height: 4000px; }
.section__inner { padding: 16px 18px 20px; }