/* ─── Scroll Indicator ─── */

.scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-8) 0 var(--space-4);
  opacity: 0.6;
  transition: opacity 0.3s;
}

.scroll-indicator:hover {
  opacity: 1;
}

.scroll-indicator__text {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-tertiary);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
}

.scroll-indicator__arrow {
  width: 20px;
  height: 20px;
  color: var(--color-text-tertiary);
  animation: scroll-bounce 2s ease-in-out infinite;
}

@keyframes scroll-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* ─── Scatter Section (landing page) ─── */

.scatter {
  padding: var(--space-10) 0 var(--space-16);
  background: var(--color-bg);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scatter--hidden {
  opacity: 0;
  transform: translateY(30px);
}

.scatter--visible {
  opacity: 1;
  transform: translateY(0);
}

.scatter__toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
}

.scatter__chart-wrap {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-6);
}

.scatter__chart {
  width: 100%;
  min-height: 500px;
}

.scatter__actions {
  display: flex;
  gap: var(--space-2);
}

/* ─── Notes below chart ─── */

.scatter__notes {
  margin-top: var(--space-4);
  font-size: var(--text-xs);
  line-height: var(--leading-relaxed);
  color: var(--color-text-tertiary);
}

.scatter__notes strong {
  color: var(--color-text-secondary);
  font-weight: 600;
}

/* ─── Info Popup ─── */

.scatter__info-popup {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  animation: scatter-fade-in 0.2s ease-out;
}

@keyframes scatter-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.scatter__info-popup-inner {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 520px;
  width: 90vw;
  padding: var(--space-8);
  animation: scatter-slide-up 0.25s var(--ease-out);
}

@keyframes scatter-slide-up {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.scatter__info-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-tertiary);
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast);
}

.scatter__info-close:hover {
  color: var(--color-text);
}

.scatter__info-title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 var(--space-4);
}

.scatter__info-body p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin: 0 0 var(--space-3);
}

.scatter__info-body p:last-child {
  margin-bottom: 0;
}

.scatter__info-body strong {
  color: var(--color-text);
  font-weight: 600;
}

/* ─── Responsive ─── */

@media (max-width: 639px) {
  .scatter {
    padding: var(--space-6) 0 var(--space-10);
  }

  .scatter__chart {
    min-height: 350px;
  }

  .scatter__chart-wrap {
    padding: var(--space-3);
    border-radius: var(--radius-md);
  }

  .scatter__toolbar {
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .scroll-indicator {
    padding: var(--space-6) 0 var(--space-2);
  }

  .scatter__info-popup-inner {
    padding: var(--space-6);
  }
}