/* ==========================================================================
   eli5.css — ELI5 Generator Tool
   Sandbox AI Platform — Content Tools
   Scoped entirely under .eli5-tool
   ========================================================================== */

/* ─── 1. PAGE SHELL ───────────────────────────────────────────────────────── */

.eli5-tool {
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding: 2rem clamp(1rem, 3vw, 2rem) 5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ─── 2. HERO ─────────────────────────────────────────────────────────────── */

.eli5-hero {
  position: relative;
  padding: 2.5rem 2rem 2rem;
  background:
    linear-gradient(155deg, rgba(255,255,255,0.045) 0%, rgba(255,255,255,0.01) 100%),
    var(--bg-panel);
  border: 1px solid var(--border-0);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.eli5-hero-ambient {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.eli5-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  animation: eli5-orb-pulse 6s ease-in-out infinite;
}

.eli5-orb--1 {
  width: 320px; height: 320px;
  top: -120px; right: -80px;
  background: radial-gradient(circle, rgba(99,102,241,0.09) 0%, transparent 70%);
  animation-delay: 0s;
}

.eli5-orb--2 {
  width: 200px; height: 200px;
  bottom: -60px; left: 10%;
  background: radial-gradient(circle, rgba(139,92,246,0.07) 0%, transparent 70%);
  animation-delay: 2s;
}

.eli5-orb--3 {
  width: 160px; height: 160px;
  top: 30%; left: 40%;
  background: radial-gradient(circle, rgba(59,130,246,0.05) 0%, transparent 70%);
  animation-delay: 4s;
}

@keyframes eli5-orb-pulse {
  0%, 100% { opacity: 0.7; transform: scale(1); }
  50%       { opacity: 1;   transform: scale(1.08); }
}

.eli5-hero-copy {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
}

.eli5-hero-icon {
  flex-shrink: 0;
  font-size: 2rem;
  line-height: 1;
  margin-top: 3px;
  filter: drop-shadow(0 0 16px rgba(99,102,241,0.3));
}

.eli5-hero-title {
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  letter-spacing: -0.03em;
  color: var(--ink-0);
  margin: 0 0 0.5rem;
  line-height: 1.1;
}

.eli5-hero-desc {
  font-size: var(--text-sm);
  color: var(--text-soft);
  line-height: 1.75;
  margin: 0 0 1.25rem;
  max-width: 52ch;
}

/* ─── 3. FEATURE PILLS ────────────────────────────────────────────────────── */

.eli5-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4375rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.eli5-pill {
  font-size: 10px;
  font-weight: var(--weight-semi);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: var(--surface-1);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-pill);
  padding: 0.25rem 0.625rem;
  line-height: 1.5;
}

/* ─── 4. EXAMPLE CHIPS BAR ───────────────────────────────────────────────── */

.eli5-chips-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.625rem;
  padding: 0.875rem 1.125rem;
  background: var(--surface-0);
  border: 1px solid var(--border-0);
  border-radius: var(--radius-lg);
}

.eli5-chips-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-semi);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.eli5-chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4375rem;
}

.eli5-chip {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--text-soft);
  background: var(--surface-1);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-md);
  padding: 0.28rem 0.7rem;
  cursor: pointer;
  line-height: 1.5;
  user-select: none;
  transition:
    background var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease),
    transform var(--dur-fast) var(--ease-spring);
}

.eli5-chip:hover {
  background: var(--surface-2);
  border-color: var(--accent);
  color: var(--ink-0);
  transform: translateY(-1px);
}

.eli5-chip:active {
  transform: translateY(0) scale(0.96);
}

/* ─── 5. WORKSPACE ───────────────────────────────────────────────────────── */

.eli5-workspace {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
}

/* ─── 6. INPUT CARD ──────────────────────────────────────────────────────── */

.eli5-input-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-0);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  transition:
    border-color var(--dur-base) var(--ease),
    box-shadow var(--dur-base) var(--ease);
}

.eli5-input-card:focus-within {
  border-color: var(--border-1);
  box-shadow: 0 0 0 1px rgba(99,102,241,0.15), 0 8px 32px rgba(0,0,0,0.2);
}

.eli5-input-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-semi);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  display: block;
}

.eli5-input-wrap {
  position: relative;
}

.eli5-textarea {
  width: 100%;
  min-height: 88px;
  resize: none;
  background: rgba(0,0,0,0.22);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-lg);
  outline: none;
  color: var(--ink-0);
  font-family: var(--font, inherit);
  font-size: var(--text-base);
  line-height: 1.7;
  padding: 0.875rem 1rem 2rem;
  caret-color: var(--accent);
  box-sizing: border-box;
  transition:
    border-color var(--dur-base) var(--ease),
    background var(--dur-base) var(--ease),
    box-shadow var(--dur-base) var(--ease);
}

.eli5-textarea::placeholder {
  color: var(--text-muted);
  opacity: 0.45;
}

.eli5-textarea:focus {
  background: rgba(0,0,0,0.32);
  border-color: var(--accent);
  box-shadow:
    0 0 0 3px rgba(99,102,241,0.12),
    0 0 24px rgba(99,102,241,0.08);
}

.eli5-char-count {
  position: absolute;
  bottom: 0.5rem;
  right: 0.75rem;
  font-size: 0.6875rem;
  color: var(--text-muted);
  opacity: 0.5;
  font-variant-numeric: tabular-nums;
  pointer-events: none;
  transition: color var(--dur-fast) var(--ease), opacity var(--dur-fast) var(--ease);
}

.eli5-char-count--warn {
  color: #f59e0b;
  opacity: 1;
}

/* ─── 7. ACTION ROW ──────────────────────────────────────────────────────── */

.eli5-action-row {
  display: flex;
  justify-content: flex-end;
}

.eli5-explain-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 140px;
  min-height: 44px;
  font-size: var(--text-sm);
  font-weight: var(--weight-semi);
  letter-spacing: 0.04em;
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}

.eli5-explain-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.08) 0%, transparent 60%);
  pointer-events: none;
}

.eli5-explain-btn:disabled {
  opacity: 0.5;
  pointer-events: none;
}

.eli5-btn-icon {
  font-size: 0.75rem;
  opacity: 0.7;
  transition: transform var(--dur-fast) var(--ease-spring);
}

.eli5-explain-btn:hover .eli5-btn-icon {
  transform: rotate(45deg) scale(1.2);
}

/* ─── 8. FLOATING TITLE — hidden by default, takes NO space ──────────────── */

/*
  The floating title div is always in the DOM but we never show it —
  the output card's own h2 renders the topic title.
  This rule ensures it never contributes layout space.
*/
.eli5-floating-title {
  display: none;
}

/* ─── 9. LOADING STATE ───────────────────────────────────────────────────── */

.eli5-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  padding: 2.5rem 2rem;
  background: var(--bg-panel);
  border: 1px solid var(--border-0);
  border-radius: var(--radius-xl);
  animation: eli5-fade-up var(--dur-base) var(--ease) both;
}

.eli5-loading[hidden] { display: none; }

.eli5-thinking {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.eli5-thinking-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.3;
  animation: eli5-dot-bounce 1.2s ease-in-out infinite;
}

.eli5-thinking-dot:nth-child(1) { animation-delay: 0s; }
.eli5-thinking-dot:nth-child(2) { animation-delay: 0.18s; }
.eli5-thinking-dot:nth-child(3) { animation-delay: 0.36s; }

@keyframes eli5-dot-bounce {
  0%, 80%, 100% { opacity: 0.2; transform: scale(0.85); }
  40%           { opacity: 1;   transform: scale(1.2); }
}

.eli5-thinking-label {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin: 0;
  letter-spacing: 0.02em;
}

.eli5-skeleton {
  width: 100%;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.eli5-skeleton-gap { height: 0.5rem; }

.eli5-skeleton-line {
  height: 13px;
  border-radius: var(--radius-md);
  background: linear-gradient(
    90deg,
    var(--surface-1) 25%,
    var(--surface-2) 50%,
    var(--surface-1) 75%
  );
  background-size: 200% 100%;
  animation: eli5-shimmer 1.4s ease-in-out infinite;
}

.eli5-skeleton-line--wide   { width: 100%; }
.eli5-skeleton-line--mid    { width: 72%; }
.eli5-skeleton-line--narrow { width: 45%; }

@keyframes eli5-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ─── 10. EMPTY STATE ────────────────────────────────────────────────────── */

.eli5-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  padding: 3.5rem 2rem;
  background: var(--surface-0);
  border: 1px dashed var(--border-0);
  border-radius: var(--radius-xl);
}

.eli5-empty[hidden] { display: none; }

.eli5-empty-illustration {
  font-size: 3rem;
  opacity: 0.2;
  filter: grayscale(1);
  margin-bottom: 0.375rem;
}

.eli5-empty-title {
  font-size: var(--text-base);
  font-weight: var(--weight-semi);
  color: var(--text-muted);
  margin: 0;
}

.eli5-empty-sub {
  font-size: var(--text-sm);
  color: var(--text-muted);
  opacity: 0.55;
  margin: 0;
}

/* ─── 11. OUTPUT CARD ────────────────────────────────────────────────────── */

.eli5-output-card {
  background:
    linear-gradient(160deg, rgba(255,255,255,0.03) 0%, transparent 100%),
    var(--bg-panel);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-xl);
  padding: 2rem 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.375rem;
  animation: eli5-card-reveal 0.6s cubic-bezier(0.22,1,0.36,1) both;
}

.eli5-output-card[hidden] { display: none; }

@keyframes eli5-card-reveal {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.eli5-output-title {
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  letter-spacing: -0.025em;
  color: var(--ink-0);
  margin: 0;
  line-height: 1.2;
}

.eli5-divider {
  border: none;
  border-top: 1px solid var(--border-0);
  margin: 0;
}

/* ─── 12. SUMMARY BLOCK ───────────────────────────────────────────────────── */

.eli5-summary-block {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  animation: eli5-fade-up 0.5s 0.15s cubic-bezier(0.22,1,0.36,1) both;
}

/*
  Hide the entire summary block — including its label and dividers —
  when the summary paragraph is empty. This eliminates the blank
  highlighted box that appeared when the backend returned no summary.
*/
.eli5-summary-block:has(#eli5-summary-text:empty) {
  display: none;
}

/* Also hide the divider immediately before the summary block when it's hidden */
.eli5-summary-block:has(#eli5-summary-text:empty) + .eli5-divider,
.eli5-divider:has(+ .eli5-summary-block #eli5-summary-text:empty) {
  display: none;
}

.eli5-block-label {
  font-size: 10px;
  font-weight: var(--weight-semi);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.eli5-summary-text {
  font-size: var(--text-base);
  line-height: 1.75;
  color: var(--ink-1);
  margin: 0;
  padding: 1rem 1.25rem;
  background: rgba(99,102,241,0.06);
  border: 1px solid rgba(99,102,241,0.14);
  border-radius: var(--radius-lg);
  font-style: italic;
}

/* ─── 13. EXPLANATION BLOCK ───────────────────────────────────────────────── */

.eli5-explanation-block {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  animation: eli5-fade-up 0.5s 0.28s cubic-bezier(0.22,1,0.36,1) both;
}

.eli5-explanation-text {
  font-size: var(--text-base);
  line-height: 1.85;
  color: var(--text-soft);
}

/* Tighten paragraph spacing — kills the excessive blank space between paras */
.eli5-explanation-text p {
  margin: 0 0 0.75rem;
}

.eli5-explanation-text p:last-child {
  margin-bottom: 0;
}

.eli5-explanation-text strong {
  color: var(--ink-0);
  font-weight: var(--weight-semi);
}

.eli5-explanation-text em {
  color: var(--ink-1);
  font-style: italic;
}

/* ─── 14. OUTPUT ACTIONS ──────────────────────────────────────────────────── */

.eli5-output-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding-top: 0.25rem;
  border-top: 1px solid var(--border-0);
  animation: eli5-fade-up 0.5s 0.38s cubic-bezier(0.22,1,0.36,1) both;
}

.eli5-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  height: 2rem;
  padding: 0 0.875rem;
  border: 1px solid var(--border-1);
  border-radius: var(--radius-md);
  background: var(--surface-1);
  color: var(--text-soft);
  font-size: 0.75rem;
  font-weight: var(--weight-semi);
  letter-spacing: 0.04em;
  cursor: pointer;
  user-select: none;
  transition:
    background var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease),
    transform var(--dur-fast) var(--ease-spring);
}

.eli5-action-btn:hover {
  background: var(--surface-2);
  border-color: var(--border-2);
  color: var(--ink-0);
  transform: translateY(-1px);
}

.eli5-action-btn:active {
  transform: translateY(0) scale(0.95);
}

.eli5-action-btn--ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-muted);
}

.eli5-action-btn--ghost:hover {
  background: var(--surface-1);
  border-color: var(--border-0);
  color: var(--ink-1);
}

.eli5-action-btn--copied {
  border-color: rgba(74,222,128,0.3) !important;
  color: #4ade80 !important;
  background: rgba(74,222,128,0.07) !important;
}

/* ─── BOOKMARK BUTTON STATE ──────────────────────────────────────────────── */

.eli5-action-btn--bookmarked {
  border-color: rgba(139, 92, 246, 0.4) !important;
  color: #a78bfa !important;
  background: rgba(139, 92, 246, 0.1) !important;
}

.eli5-action-btn--bookmarked .eli5-bookmark-icon {
  /* swap hollow heart → filled using Unicode */
  font-style: normal;
}

/* ─── 15. EXPLORE TOPICS ──────────────────────────────────────────────────── */

.eli5-explore {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.eli5-explore-header {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.eli5-explore-title {
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  letter-spacing: -0.02em;
  color: var(--ink-0);
  margin: 0;
}

.eli5-explore-desc {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin: 0;
  line-height: 1.6;
}

.eli5-explore-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

/* ─── 16. TOPIC CARDS ─────────────────────────────────────────────────────── */

.eli5-topic-card {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1.125rem 1.125rem 1rem;
  background:
    linear-gradient(140deg, rgba(255,255,255,0.03) 0%, transparent 100%),
    var(--bg-panel);
  border: 1px solid var(--border-0);
  border-radius: var(--radius-xl);
  cursor: pointer;
  text-align: left;
  user-select: none;
  transition:
    background var(--dur-base) var(--ease),
    border-color var(--dur-base) var(--ease),
    transform var(--dur-base) var(--ease-spring),
    box-shadow var(--dur-base) var(--ease);
}

.eli5-topic-card:hover {
  background:
    linear-gradient(140deg, rgba(99,102,241,0.07) 0%, rgba(255,255,255,0.02) 100%),
    var(--bg-panel);
  border-color: rgba(99,102,241,0.28);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

.eli5-topic-card:active {
  transform: translateY(0) scale(0.98);
}

.eli5-topic-icon {
  font-size: 1.5rem;
  line-height: 1;
  margin-bottom: 0.25rem;
}

.eli5-topic-name {
  font-size: var(--text-sm);
  font-weight: var(--weight-semi);
  color: var(--ink-1);
  line-height: 1.2;
}

.eli5-topic-sub {
  font-size: var(--text-xs);
  color: var(--text-muted);
  line-height: 1.5;
}

/* ─── 17. SHARED ANIMATIONS ──────────────────────────────────────────────── */

@keyframes eli5-fade-up {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes eli5-spin {
  to { transform: rotate(360deg); }
}

/* ─── 18. RESPONSIVE — Tablet (≤ 1024px) ────────────────────────────────── */

@media (max-width: 1024px) {
  .eli5-explore-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ─── 19. RESPONSIVE — Mobile (≤ 768px) ──────────────────────────────────── */

@media (max-width: 768px) {
  .eli5-tool {
    padding: 1.25rem 0 3.5rem;
    gap: 1rem;
  }

  .eli5-hero {
    padding: 1.5rem 1.25rem 1.375rem;
  }

  .eli5-hero-copy {
    flex-direction: column;
    gap: 0.75rem;
  }

  .eli5-hero-title {
    font-size: var(--text-2xl);
  }

  .eli5-output-card {
    padding: 1.5rem 1.25rem 1.25rem;
  }

  .eli5-input-card {
    padding: 1.25rem;
  }

  .eli5-explore-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ─── 20. RESPONSIVE — Small Mobile (≤ 480px) ───────────────────────────── */

@media (max-width: 480px) {
  .eli5-hero-title {
    font-size: var(--text-xl);
  }

  .eli5-explore-grid {
    grid-template-columns: 1fr;
  }

  .eli5-chip-group {
    gap: 0.3125rem;
  }

  .eli5-explain-btn {
    width: 100%;
    justify-content: center;
  }

  .eli5-action-row {
    justify-content: stretch;
  }

  .eli5-output-actions {
    gap: 0.375rem;
  }

  .eli5-action-btn {
    flex: 1;
    justify-content: center;
  }
}

/* ─── 21. REDUCED MOTION ──────────────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  .eli5-orb,
  .eli5-thinking-dot,
  .eli5-skeleton-line,
  .eli5-output-card,
  .eli5-summary-block,
  .eli5-explanation-block,
  .eli5-output-actions {
    animation: none !important;
    transition: opacity var(--dur-fast) var(--ease) !important;
  }
}

/* ─── 22. FOCUS VISIBLE ───────────────────────────────────────────────────── */

.eli5-tool .eli5-textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.eli5-tool .eli5-chip:focus-visible,
.eli5-tool .eli5-action-btn:focus-visible,
.eli5-tool .eli5-topic-card:focus-visible,
.eli5-tool .eli5-explain-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}