/* ============================================================
   PERSAMAAN KUADRAT — Ruang Belajar
   Prefix: .pq-
   ============================================================ */

.pq-page {
  padding: 56px 0 100px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.pq-intro {
  text-align: center;
  max-width: 48ch;
  margin-bottom: 28px;
}

.pq-intro .hero__eyebrow {
  margin-bottom: 18px;
}

.pq-intro h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  letter-spacing: -0.02em;
  margin: 0 0 10px;
}

.pq-intro p {
  color: var(--ink-soft);
  margin: 0;
  line-height: 1.6;
}

/* ---------------- CONTENT LAYOUT ---------------- */
.pq-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  width: 100%;
  max-width: 1000px;
  align-items: start;
}

/* ---------------- GRAPH ---------------- */
.pq-graph-wrap {
  position: sticky;
  top: 20px;
}

.pq-graph {
  background: var(--ink);
  border-radius: var(--radius-lg);
  aspect-ratio: 1 / 1;
  position: relative;
  overflow: hidden;
  box-shadow: 0 30px 60px -25px rgba(27, 31, 59, 0.45);
}

#pq-canvas {
  width: 100%;
  height: 100%;
}

.pq-graph__hint {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.68rem;
  color: rgba(255, 255, 255, 0.35);
  background: rgba(0, 0, 0, 0.3);
  padding: 4px 12px;
  border-radius: 999px;
  white-space: nowrap;
  pointer-events: none;
}

/* ---------------- CALCULATOR ---------------- */
.pq-calculator {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.pq-equation-display {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.pq-eq-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.pq-eq-text {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ink);
}

.pq-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}

.pq-input-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.pq-input-group label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.pq-input-group input {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  background: var(--bg);
  color: var(--ink);
  text-align: center;
  transition: border-color var(--dur-fast) var(--ease);
}

.pq-input-group input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(61, 90, 254, 0.1);
}

.pq-preset-btn {
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 10px 16px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--ink);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), transform 120ms var(--ease);
}

.pq-preset-btn:hover {
  border-color: var(--accent);
  background: rgba(61, 90, 254, 0.04);
}

.pq-preset-btn:active {
  transform: scale(0.96);
}

.pq-results {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.pq-result-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  text-align: center;
}

.pq-result-card--full {
  grid-column: 1 / -1;
}

.pq-result-card__label {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--ink-soft);
  margin-bottom: 2px;
  display: block;
}

.pq-result-card__value {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent-ink);
}

.pq-steps {
  background: rgba(61, 90, 254, 0.03);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px 18px;
}

.pq-steps__title {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--ink);
  display: block;
  margin-bottom: 8px;
}

.pq-steps__content {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.pq-steps__content .pq-step {
  padding: 4px 0;
}

.pq-steps__content .pq-step--highlight {
  color: var(--accent-ink);
  font-weight: 600;
}

/* ---------------- RESPONSIVE ---------------- */
@media (max-width: 800px) {
  .pq-content {
    grid-template-columns: 1fr;
  }

  .pq-graph-wrap {
    position: static;
  }

  .pq-graph {
    aspect-ratio: 1 / 1;
  }
}