/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'DM Sans', system-ui, sans-serif;
  color: #1a1a2e;
  background: #f5f6fa;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Hero ── */
.hero {
  background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
  color: #fff;
  padding: 3.5rem 2rem 2.5rem;
  text-align: center;
}
.hero-inner { max-width: 800px; margin: 0 auto; }
.hero-title {
  font-size: 2.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.3rem;
  background: linear-gradient(90deg, #e0c3fc, #8ec5fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.15rem;
  opacity: 0.85;
  margin-bottom: 0.8rem;
  font-weight: 500;
}
.hero-authors { font-size: 0.9rem; opacity: 0.7; margin-bottom: 0.2rem; }
.hero-affiliations { font-size: 0.82rem; opacity: 0.5; margin-bottom: 1.2rem; }
.hero-links { display: flex; gap: 0.8rem; justify-content: center; }
.hero-btn {
  display: inline-block;
  padding: 0.45rem 1.4rem;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 6px;
  color: #fff;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s;
}
.hero-btn:hover { background: rgba(255,255,255,0.12); border-color: rgba(255,255,255,0.5); }

/* ── Stepper ── */
.stepper {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid #e2e4ea;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.stepper-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1rem;
  gap: 0;
}
.step {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.2rem;
  border: none;
  background: none;
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.2s;
  font-family: inherit;
}
.step:hover { background: #f0f1f5; }
.step-num {
  width: 28px; height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  background: #e2e4ea;
  color: #666;
  transition: all 0.25s;
}
.step-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: #888;
  transition: color 0.25s;
}
.step.active .step-num { background: #302b63; color: #fff; }
.step.active .step-label { color: #1a1a2e; font-weight: 600; }
.step.completed .step-num { background: #22c55e; color: #fff; }
.step.completed .step-label { color: #1a1a2e; }
.step-connector {
  width: 40px; height: 2px;
  background: #e2e4ea;
  transition: background 0.3s;
}
.step-connector.filled { background: #22c55e; }

/* ── Main ── */
main { max-width: 1100px; margin: 0 auto; padding: 1.5rem 1.5rem 3rem; }
.phase { display: none; animation: fadeIn 0.3s ease; }
.phase.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.phase-header { margin-bottom: 1.5rem; }
.phase-header h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 0.3rem;
}
.phase-desc { color: #666; font-size: 0.95rem; }

/* ── Stats Bar ── */
.stats-bar {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.stat-card {
  flex: 1;
  min-width: 140px;
  background: #fff;
  border-radius: 10px;
  padding: 1rem 1.2rem;
  border: 1px solid #e8eaef;
}
.stat-value {
  font-size: 1.7rem;
  font-weight: 700;
  color: #302b63;
  font-variant-numeric: tabular-nums;
}
.stat-label { font-size: 0.78rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; margin-top: 0.15rem; }

/* ── Charts ── */
.chart-container {
  background: #fff;
  border-radius: 10px;
  padding: 1.5rem;
  border: 1px solid #e8eaef;
  margin-bottom: 1.5rem;
}
.chart-container h3 { font-size: 1rem; font-weight: 600; margin-bottom: 1rem; }

.bar-chart { display: flex; flex-direction: column; gap: 0.6rem; }
.bar-row { display: flex; align-items: center; gap: 0.8rem; }
.bar-label {
  width: 180px;
  text-align: right;
  font-size: 0.82rem;
  font-family: 'JetBrains Mono', monospace;
  color: #555;
  flex-shrink: 0;
}
.bar-track {
  flex: 1;
  height: 26px;
  background: #f0f1f5;
  border-radius: 6px;
  overflow: hidden;
  position: relative;
}
.bar-fill {
  height: 100%;
  border-radius: 6px;
  transition: width 0.8s cubic-bezier(0.22, 1, 0.36, 1);
  display: flex;
  align-items: center;
  padding-left: 8px;
}
.bar-value {
  font-size: 0.75rem;
  font-weight: 600;
  color: #fff;
  font-family: 'JetBrains Mono', monospace;
}

/* ── Section blocks ── */
.section-block {
  background: #fff;
  border-radius: 10px;
  padding: 1.5rem;
  border: 1px solid #e8eaef;
  margin-bottom: 1.5rem;
}
.section-block h3 { font-size: 1rem; font-weight: 600; margin-bottom: 1rem; }
.hint { font-size: 0.8rem; color: #999; font-weight: 400; }

/* ── Exploration Table ── */
.trace-table { overflow-x: auto; }
.trace-row {
  border: 1px solid #e8eaef;
  border-radius: 8px;
  margin-bottom: 0.5rem;
  overflow: hidden;
  transition: box-shadow 0.2s;
}
.trace-row:hover { box-shadow: 0 2px 8px rgba(0,0,0,0.06); }
.trace-summary {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.7rem 1rem;
  cursor: pointer;
  user-select: none;
}
.trace-q {
  flex: 1;
  font-size: 0.88rem;
  color: #333;
}
.trace-gt {
  font-size: 0.78rem;
  color: #888;
  max-width: 200px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.model-dots {
  display: flex;
  gap: 3px;
  flex-shrink: 0;
}
.model-dot {
  width: 22px; height: 22px;
  border-radius: 4px;
  font-size: 0.6rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}
.model-dot.success { background: #22c55e; }
.model-dot.fail { background: #ef4444; }
.trace-expand {
  display: none;
  padding: 0.8rem 1rem;
  border-top: 1px solid #e8eaef;
  background: #fafbfd;
}
.trace-row.open .trace-expand { display: block; }
.response-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.8rem;
}
.response-card {
  border: 1px solid #e2e4ea;
  border-radius: 8px;
  padding: 0.8rem;
  background: #fff;
}
.response-card h4 {
  font-size: 0.78rem;
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.response-card p {
  font-size: 0.82rem;
  color: #555;
  line-height: 1.5;
  max-height: 120px;
  overflow-y: auto;
}
.em-badge {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
}
.em-badge.pass { background: #dcfce7; color: #166534; }
.em-badge.fail { background: #fee2e2; color: #991b1b; }

/* ── Action Bar ── */
.action-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.action-btn {
  padding: 0.6rem 1.8rem;
  border: none;
  border-radius: 8px;
  background: linear-gradient(135deg, #302b63, #24243e);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.2s;
}
.action-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(48,43,99,0.3); }
.action-btn:disabled { opacity: 0.5; cursor: default; transform: none; box-shadow: none; }
.action-status { font-size: 0.85rem; color: #666; }

/* ── Learning Log ── */
.learning-log {
  max-height: 400px;
  overflow-y: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  line-height: 1.7;
  background: #1a1a2e;
  color: #a0aec0;
  border-radius: 10px;
  padding: 1rem 1.2rem;
  margin-bottom: 1.5rem;
  display: none;
}
.learning-log.visible { display: block; }
.log-line { opacity: 0; animation: logAppear 0.15s ease forwards; }
@keyframes logAppear { to { opacity: 1; } }
.log-ts { color: #4a5568; }
.log-phase { color: #8ec5fc; font-weight: 600; }
.log-milestone { color: #e0c3fc; font-weight: 500; }
.log-discovery { color: #86efac; }
.log-category { color: #fbbf24; }
.log-skill { color: #94a3b8; padding-left: 1.5rem; }
.log-profiling { color: #67e8f9; }
.log-merge-apply { color: #4ade80; }
.log-merge-reject { color: #f87171; }
.log-done { color: #22c55e; font-weight: 600; }

/* ── Handbook Display ── */
.handbook-display { animation: fadeIn 0.4s ease; }
.handbook-grid {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}
@media (max-width: 800px) { .handbook-grid { grid-template-columns: 1fr; } }
.handbook-col { background: #fff; border-radius: 10px; padding: 1.2rem; border: 1px solid #e8eaef; }
.handbook-col h3 { font-size: 1rem; font-weight: 600; margin-bottom: 1rem; }
.badge {
  display: inline-block;
  padding: 0.1rem 0.6rem;
  border-radius: 10px;
  background: #302b63;
  color: #fff;
  font-size: 0.72rem;
  font-weight: 600;
  vertical-align: middle;
}

/* Mode insights */
.mode-card {
  border: 1px solid #e8eaef;
  border-radius: 8px;
  margin-bottom: 0.6rem;
  overflow: hidden;
}
.mode-card-header {
  padding: 0.6rem 0.8rem;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #fafbfd;
}
.mode-card-header:hover { background: #f0f1f5; }
.mode-card-body { padding: 0.6rem 0.8rem; display: none; border-top: 1px solid #e8eaef; }
.mode-card.open .mode-card-body { display: block; }
.insight-item {
  font-size: 0.8rem;
  color: #555;
  padding: 0.3rem 0;
  border-bottom: 1px solid #f0f1f5;
  display: flex;
  gap: 0.5rem;
}
.insight-item:last-child { border: none; }
.insight-type {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  flex-shrink: 0;
  height: fit-content;
}
.insight-type.usage { background: #dbeafe; color: #1e40af; }
.insight-type.constraint { background: #fee2e2; color: #991b1b; }
.insight-type.transition { background: #fef3c7; color: #92400e; }

/* Skill tree */
.skill-category {
  margin-bottom: 0.6rem;
  border: 1px solid #e8eaef;
  border-radius: 8px;
  overflow: hidden;
}
.cat-header {
  padding: 0.55rem 0.8rem;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: #fafbfd;
}
.cat-header:hover { background: #f0f1f5; }
.cat-header .cat-count {
  font-size: 0.7rem;
  font-weight: 500;
  color: #888;
}
.cat-header .chevron { transition: transform 0.2s; font-size: 0.7rem; color: #999; }
.skill-category.open .chevron { transform: rotate(90deg); }
.cat-skills { display: none; border-top: 1px solid #e8eaef; }
.skill-category.open .cat-skills { display: block; }
.skill-item {
  padding: 0.5rem 0.8rem 0.5rem 1.4rem;
  border-bottom: 1px solid #f0f1f5;
  cursor: pointer;
  transition: background 0.15s;
}
.skill-item:last-child { border: none; }
.skill-item:hover { background: #f8f9fc; }
.skill-item.selected { background: #ede9fe; }
.skill-name { font-size: 0.82rem; font-weight: 500; color: #333; }
.skill-desc { font-size: 0.75rem; color: #888; margin-top: 0.15rem; }
.skill-detail {
  padding: 0.6rem 0.8rem;
  background: #fafbfd;
  border-top: 1px solid #e8eaef;
  font-size: 0.78rem;
}
.skill-detail dt { font-weight: 600; color: #555; margin-top: 0.4rem; }
.skill-detail dd { color: #777; margin-left: 0.5rem; }
.skill-detail .indicator-tag {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  background: #e8eaef;
  border-radius: 4px;
  font-size: 0.72rem;
  margin: 0.15rem 0.2rem 0.15rem 0;
  font-family: 'JetBrains Mono', monospace;
}

/* ── Model Pool ── */
.model-pool {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.6rem;
}
.pool-model-card {
  background: #fafbfd;
  border: 1px solid #e8eaef;
  border-radius: 8px;
  padding: 0.6rem 0.8rem;
}
.pool-model-name {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 0.15rem;
}
.pool-model-meta {
  font-size: 0.75rem;
  color: #888;
}

/* ── Heatmap (per-category) ── */
.heatmap-container { padding-bottom: 0.5rem; }
.heatmap-controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
}
.heatmap-controls label {
  font-size: 0.85rem;
  font-weight: 600;
  color: #555;
}
.heatmap-select {
  padding: 0.4rem 0.8rem;
  border: 1px solid #e2e4ea;
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.85rem;
  background: #fff;
  color: #333;
  cursor: pointer;
  min-width: 260px;
}
.heatmap-select:focus { outline: none; border-color: #302b63; }

.hm-table {
  border-collapse: separate;
  border-spacing: 2px;
  width: 100%;
}
.hm-table th, .hm-table td { padding: 0.4rem 0.5rem; }
.hm-model-header {
  text-align: right;
  padding-right: 0.6rem !important;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.76rem;
  font-weight: 600;
  white-space: nowrap;
  color: #555;
  min-width: 180px;
}
.hm-overall-header {
  text-align: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: #666;
}
.hm-overall-cell { text-align: center; }
.hm-skill-header {
  font-size: 0.75rem;
  font-weight: 500;
  color: #555;
  text-align: center;
  min-width: 100px;
  white-space: normal;
  line-height: 1.3;
}
.hm-cell {
  border-radius: 4px;
  text-align: center;
  font-size: 0.72rem;
  font-weight: 600;
  font-family: 'JetBrains Mono', monospace;
  cursor: pointer;
  transition: transform 0.15s;
  border: 1px solid transparent;
  min-width: 60px;
  height: 34px;
}
.hm-cell:hover { transform: scale(1.1); z-index: 2; border-color: #302b63; }
.heatmap-overall {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  display: inline-block;
}

/* Agent detail panel */
.agent-detail {
  background: #fff;
  border: 1px solid #e8eaef;
  border-radius: 10px;
  padding: 1.2rem;
  margin-top: 1rem;
  animation: fadeIn 0.3s ease;
}
.agent-detail h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
  font-family: 'JetBrains Mono', monospace;
}
.agent-meta { display: flex; gap: 1.5rem; margin-bottom: 0.8rem; font-size: 0.82rem; color: #666; }
.agent-lists { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 600px) { .agent-lists { grid-template-columns: 1fr; } }
.agent-lists h5 { font-size: 0.82rem; font-weight: 600; margin-bottom: 0.4rem; }
.agent-lists ul { list-style: none; }
.agent-lists li {
  font-size: 0.78rem;
  color: #555;
  padding: 0.2rem 0;
  line-height: 1.4;
}
.strength-icon::before { content: "+" ; color: #22c55e; font-weight: 700; margin-right: 0.3rem; }
.weakness-icon::before { content: "−" ; color: #ef4444; font-weight: 700; margin-right: 0.3rem; }

/* ── Candidate Cards ── */
.candidate-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.cand-card {
  background: #fff;
  border: 2px solid #e8eaef;
  border-radius: 10px;
  padding: 1.2rem;
  transition: all 0.25s;
  position: relative;
}
.cand-card.hidden { opacity: 0; transform: translateY(12px); }
.cand-card.reveal { animation: cardReveal 0.4s ease forwards; }
@keyframes cardReveal { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
.cand-card.selected { border-color: #302b63; box-shadow: 0 4px 16px rgba(48,43,99,0.15); animation: cardSelect 0.5s ease forwards; }
@keyframes cardSelect { 0% { box-shadow: 0 0 0 rgba(48,43,99,0); } 50% { box-shadow: 0 0 24px rgba(48,43,99,0.3); } 100% { box-shadow: 0 4px 16px rgba(48,43,99,0.15); } }
.cand-card .selected-badge {
  position: absolute;
  top: -10px; right: 12px;
  background: #302b63;
  color: #fff;
  padding: 0.15rem 0.7rem;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 700;
}
.cand-card h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 0.6rem; }
.cand-stats { display: flex; flex-direction: column; gap: 0.3rem; }
.cand-stat {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
}
.cand-stat .label { color: #888; }
.cand-stat .val { font-weight: 600; font-family: 'JetBrains Mono', monospace; }

/* Pareto chart */
.pareto-chart {
  position: relative;
  height: 320px;
  margin-top: 0.5rem;
}
.pareto-svg { width: 100%; height: 100%; }

/* ── Test Examples ── */
.test-card {
  border: 1px solid #e8eaef;
  border-radius: 10px;
  margin-bottom: 1rem;
  overflow: hidden;
  background: #fff;
}
.test-card-header {
  padding: 0.8rem 1rem;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
}
.test-card-header:hover { background: #fafbfd; }
.test-q { flex: 1; font-size: 0.9rem; color: #333; font-weight: 500; }
.test-badge {
  padding: 0.15rem 0.7rem;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 700;
  flex-shrink: 0;
}
.test-badge.correct { background: #dcfce7; color: #166534; }
.test-badge.incorrect { background: #fee2e2; color: #991b1b; }
.test-card-body {
  display: none;
  padding: 0 1rem 1rem;
  border-top: 1px solid #e8eaef;
}
.test-card.open .test-card-body { display: block; }
.test-meta {
  display: flex;
  gap: 1.5rem;
  font-size: 0.78rem;
  color: #888;
  margin: 0.6rem 0;
  flex-wrap: wrap;
}
.test-meta strong { color: #555; }
.turn-card {
  border: 1px solid #e2e4ea;
  border-radius: 8px;
  padding: 0.8rem;
  margin-bottom: 0.6rem;
  background: #fafbfd;
}
.turn-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.5rem;
}
.turn-num {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: #302b63;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  flex-shrink: 0;
}
.turn-action {
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
}
.turn-model {
  font-size: 0.78rem;
  font-family: 'JetBrains Mono', monospace;
  color: #666;
}
.skill-analysis-box {
  background: #1a1a2e;
  color: #a0aec0;
  border-radius: 6px;
  padding: 0.6rem 0.8rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  line-height: 1.6;
  margin-bottom: 0.5rem;
  overflow-x: auto;
}
.skill-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.15rem 0.6rem;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 500;
  margin: 0.15rem 0.2rem;
}
.skill-tag { background: #ede9fe; color: #5b21b6; }
.turn-response {
  font-size: 0.82rem;
  color: #555;
  line-height: 1.5;
  margin-top: 0.4rem;
  padding: 0.6rem;
  background: #fff;
  border-radius: 6px;
  border: 1px solid #e8eaef;
}
.gt-label { font-size: 0.8rem; color: #888; margin-top: 0.4rem; }
.gt-label strong { color: #22c55e; }
.extracted-answer {
  font-size: 0.85rem;
  color: #333;
  margin-top: 0.4rem;
  padding: 0.6rem 0.8rem;
  background: #ecfdf5;
  border: 1px solid #86efac;
  border-radius: 6px;
  line-height: 1.5;
}
.extracted-answer strong { color: #166534; }

/* ── Footer ── */
.footer {
  text-align: center;
  padding: 2rem;
  font-size: 0.82rem;
  color: #999;
  border-top: 1px solid #e8eaef;
}
.footer a { color: #302b63; text-decoration: none; }
.footer a:hover { text-decoration: underline; }

/* ── Responsive ── */
@media (max-width: 640px) {
  .hero-title { font-size: 2rem; }
  .hero-subtitle { font-size: 1rem; }
  .stepper-inner { flex-wrap: wrap; gap: 0.2rem; }
  .step-connector { width: 20px; }
  .step { padding: 0.4rem 0.6rem; }
  .step-label { font-size: 0.75rem; }
  main { padding: 1rem; }
  .stats-bar { flex-direction: column; }
  .bar-label { width: 120px; font-size: 0.7rem; }
  .candidate-cards { grid-template-columns: 1fr; }
  .response-grid { grid-template-columns: 1fr; }
}

/* ── Utility ── */
.mono { font-family: 'JetBrains Mono', monospace; }
.truncate { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }