/* flip-cards.css — shared styles for flip card interactive pages */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Trebuchet MS', 'Gill Sans', Arial, sans-serif;
  background-color: #f4f4f0;
  color: #111;
  padding: 1.5rem;
}

h1 {
  font-size: 1.6rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.4rem;
  color: #1a1a1a;
  letter-spacing: 0.02em;
}

h1 .subtitle {
  display: block;
  font-size: 1rem;
  font-weight: 400;
  font-style: italic;
  color: #444;
  margin-top: 0.2rem;
}

/* ── Controls bar ─────────────────────────────────────── */
.controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin: 1.2rem 0 1.8rem;
  flex-wrap: wrap;
}

.controls .instruction {
  font-size: 0.88rem;
  color: #444;
  font-style: italic;
}

.lang-toggle {
  display: flex;
  border: 2px solid #333;
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
}

.lang-toggle button {
  padding: 0.35rem 0.9rem;
  font-size: 0.88rem;
  font-weight: 700;
  font-family: inherit;
  border: none;
  background: #fff;
  color: #555;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.lang-toggle button.active {
  background: #333;
  color: #fff;
}

/* ── Grid ─────────────────────────────────────────────── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.2rem;
  max-width: 1100px;
  margin: 0 auto;
}

/* ── Flip card structure ──────────────────────────────── */
.flip-card {
  perspective: 1000px;
  cursor: pointer;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.45, 0.05, 0.55, 0.95);
}

/* height is driven by the front face; back face mirrors it */
.flip-card-front {
  min-height: 220px;
}

.flip-card.flipped .flip-card-inner {
  transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
  border-radius: 10px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 1.4rem;
  box-shadow: 0 3px 10px rgba(0,0,0,0.15);
}

.flip-card-back {
  position: absolute;
  inset: 0;
  justify-content: flex-start;
  align-items: flex-start;
  transform: rotateY(180deg);
  overflow-y: auto;
}

/* ── Front face ───────────────────────────────────────── */
.flip-card-front {
  /* background-color set per-card via inline style */
}

.flip-card-front .card-label {
  font-size: 1.35rem;
  font-weight: 800;
  text-align: center;
  color: #fff;
  line-height: 1.25;
  text-shadow: 0 1px 3px rgba(0,0,0,0.25);
  letter-spacing: 0.01em;
}

/* ── Back face ────────────────────────────────────────── */
.flip-card-back {
  transform: rotateY(180deg);
  /* background-color set per-card via inline style (light tint) */
  justify-content: flex-start;
  align-items: flex-start;
}

.flip-card-back .back-title {
  font-size: 0.95rem;
  font-weight: 800;
  color: #111;
  margin-bottom: 0.5rem;
  border-bottom: 2px solid rgba(0,0,0,0.15);
  width: 100%;
  padding-bottom: 0.3rem;
}

.flip-card-back .back-def {
  font-size: 0.82rem;
  color: #111;
  line-height: 1.5;
}

.flip-card-back .back-def-es {
  font-size: 0.8rem;
  color: #222;
  line-height: 1.5;
  font-style: italic;
}

/* ── Footer note ──────────────────────────────────────── */
.page-note {
  text-align: center;
  font-size: 0.78rem;
  color: #666;
  margin-top: 2rem;
  font-style: italic;
}