/* ── Drill-down overlay & panel — Spec B §4 ──────────────────────────────── */
/* Right drawer on desktop / bottom sheet on mobile. */

/* Overlay (backdrop) */
.dd-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgb(15 23 42 / 0.45);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.dd-overlay--visible {
  opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
  .dd-overlay { transition: none; }
}

/* Panel — right drawer (desktop) */
.dd-panel {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(480px, 100vw);
  background: var(--color-surface);
  box-shadow: var(--shadow-2xl);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateX(100%);
  transition: transform 280ms var(--ease-out);
  will-change: transform;
}

.dd-panel--open {
  transform: translateX(0);
}

@media (prefers-reduced-motion: reduce) {
  .dd-panel { transition: none; }
}

/* Bottom sheet on mobile */
@media (max-width: 767px) {
  .dd-panel {
    top: auto;
    right: 0;
    left: 0;
    bottom: 0;
    width: 100%;
    max-height: 90vh;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    transform: translateY(100%);
  }

  .dd-panel--open {
    transform: translateY(0);
  }
}

/* Panel header */
.dd-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
  gap: var(--space-3);
}

.dd-panel__title-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}

.dd-panel__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dd-panel__score-badge {
  flex-shrink: 0;
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-extrabold);
  line-height: 1;
  color: var(--color-primary);
}

.dd-close-btn {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface-elevated);
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
}

.dd-close-btn:hover  { background: var(--color-surface-inset); color: var(--color-text-primary); }
.dd-close-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Panel body (scrollable) */
.dd-panel__body {
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

/* AI badge */
.dd-ai-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-ai);
  background: var(--color-ai-light);
  border: 1px solid var(--color-ai-border);
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  letter-spacing: var(--tracking-wide);
}

/* Section headers within panel */
.dd-section-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--color-text-tertiary);
  margin: 0 0 var(--space-3);
}

/* Score history mini-chart */
.dd-history-wrap {
  position: relative;
  height: 100px;
  background: var(--color-surface-elevated);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.dd-history-canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

.dd-history-empty {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  text-align: center;
  padding: var(--space-6);
  margin: 0;
}

/* Calculation inputs */
.dd-calc-inputs {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.dd-input-row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
}

.dd-input-key {
  color: var(--color-text-secondary);
  text-transform: capitalize;
  flex: 1;
}

.dd-input-val {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  text-align: right;
  word-break: break-all;
  max-width: 60%;
}

/* Contributors */
.dd-contributors {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.dd-contributors-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.dd-contributors-col-title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  margin: 0 0 var(--space-1);
}

.dd-contributors-col-title--positive { color: var(--color-band-leading); }
.dd-contributors-col-title--negative { color: var(--color-band-at-risk); }

.dd-contributor-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.dd-contributor {
  font-size: var(--font-size-xs);
  line-height: var(--line-height-snug);
  display: flex;
  gap: var(--space-2);
  align-items: flex-start;
}

.dd-contributor--positive { color: var(--color-text-primary); }
.dd-contributor--negative { color: var(--color-text-primary); }

.dd-contributor span[aria-hidden] {
  flex-shrink: 0;
  font-size: 0.7rem;
  margin-top: 1px;
}

.dd-contributor--positive span[aria-hidden] { color: var(--color-band-leading); }
.dd-contributor--negative span[aria-hidden] { color: var(--color-band-at-risk); }

.dd-empty-contributors {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  font-style: italic;
}

/* Recommendation */
.dd-recommendation {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.dd-recommendation__icon {
  flex-shrink: 0;
  font-size: 1rem;
  margin-top: 1px;
}

.dd-recommendation__text {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  line-height: var(--line-height-snug);
  margin: 0;
}

/* LLM shimmer */
.dd-shimmer {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.dd-shimmer__line {
  height: 14px;
  background: linear-gradient(
    90deg,
    var(--color-surface-inset) 25%,
    var(--color-surface-elevated) 50%,
    var(--color-surface-inset) 75%
  );
  background-size: 200% 100%;
  border-radius: var(--radius-sm);
  animation: shimmer-sweep 1.6s infinite;
}

.dd-shimmer__line--short { width: 60%; }
.dd-shimmer__line--medium { width: 85%; }
.dd-shimmer__line--full { width: 100%; }

@keyframes shimmer-sweep {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

@media (prefers-reduced-motion: reduce) {
  .dd-shimmer__line { animation: none; background: var(--color-surface-inset); }
}

.dd-shimmer__label {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  font-style: italic;
  text-align: center;
  margin: 0;
}

/* LLM prose section */
.dd-llm-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.dd-llm-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.dd-llm-block__label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--color-ai);
  margin: 0;
}

.dd-llm-block__text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin: 0;
}

/* Retry button */
.dd-retry-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-5);
  background: var(--color-surface-elevated);
  border-radius: var(--radius-md);
  border: 1px dashed var(--color-border-strong);
  text-align: center;
}

.dd-retry-msg {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0;
}

.dd-retry-btn {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary-border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-5);
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-out);
}

.dd-retry-btn:hover { background: var(--color-primary-border); }
.dd-retry-btn:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

/* No-data state */
.dd-no-data {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-10);
  text-align: center;
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
}