/* ====================================
   SEC-3: ANATOMY OF AN AI AGENT
   All styles scoped with .aa- prefix
   ==================================== */

/* --- Section Sub Heading --- */
.aa-section-sub {
  font-family: var(--font);
  font-size: 1.15rem;
  color: var(--text-secondary);
  text-align: center;
  max-width: 700px;
  margin: -0.5rem auto 2.5rem;
  line-height: 1.6;
}

/* ═══════════════════════════════════
   BLOCK 1: 7-LAYER AGENT STACK
   ═══════════════════════════════════ */

.aa-stack {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-width: 860px;
  margin: 0 auto 3.5rem;
}

/* --- Layer Bar (collapsed) --- */
.aa-layer {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--layer-color, var(--accent-teal));
  overflow: hidden;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition);
}

.aa-layer:hover {
  background: var(--bg-card-hover);
}

.aa-layer--expanded {
  background: var(--bg-card-hover);
  box-shadow: var(--shadow);
  overflow: visible;
}

.aa-layer-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  user-select: none;
}

.aa-layer-num {
  font-family: var(--font);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--layer-color, var(--accent-teal));
  background: rgba(255, 255, 255, 0.06);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.aa-layer-icon {
  width: 24px;
  height: 24px;
  color: var(--layer-color, var(--accent-teal));
  flex-shrink: 0;
}

.aa-layer-name {
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}

.aa-layer-tagline {
  font-family: var(--font);
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-left: auto;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.aa-layer-chevron {
  width: 20px;
  height: 20px;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: transform var(--transition);
  margin-left: 8px;
}

.aa-layer--expanded .aa-layer-chevron {
  transform: rotate(180deg);
}

/* --- Layer Detail (expanded) --- */
.aa-layer-detail {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  padding: 0 18px;
  border-top: 1px solid transparent;
}

.aa-layer--expanded .aa-layer-detail {
  max-height: 600px;
  padding: 16px 18px 20px;
  border-top-color: rgba(255, 255, 255, 0.06);
  overflow: visible;
}

/* --- Stack Sub-heading --- */
.aa-stack-sub {
  font-family: var(--font);
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
  margin: -0.75rem auto 1.5rem;
  max-width: 520px;
}

/* --- Detail: Tool Chips --- */
.aa-detail-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.aa-tool-chip {
  font-family: var(--font);
  font-size: 0.78rem;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
  padding: 5px 12px;
  border-radius: 20px;
  white-space: nowrap;
  position: relative;
}

/* --- Download count inside chip --- */
.aa-chip-dl {
  color: var(--text-secondary);
  font-size: 0.68rem;
  margin-left: 4px;
  opacity: 0.8;
}

/* --- Funded company chip --- */
.aa-tool-chip--funded {
  border: 1px solid rgba(245, 197, 66, 0.25);
  background: rgba(245, 197, 66, 0.06);
  cursor: default;
}

.aa-tool-chip--funded:hover {
  background: rgba(245, 197, 66, 0.12);
  border-color: rgba(245, 197, 66, 0.4);
}

/* --- Has-tip chip indicator --- */
.aa-tool-chip--has-tip {
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.aa-tool-chip--has-tip:not(.aa-tool-chip--funded):not(.aa-tool-chip--dvc):hover {
  background: rgba(255, 255, 255, 0.14);
}

/* --- Universal tooltip (JS-positioned) --- */
.aa-tip-popup {
  position: fixed;
  z-index: 9999;
  background: #1a1e2e;
  border: 1px solid rgba(78, 205, 196, 0.25);
  border-radius: 10px;
  padding: 12px 16px;
  min-width: 220px;
  max-width: 320px;
  white-space: normal;
  font-family: var(--font);
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.55;
  box-shadow: 0 12px 40px rgba(0,0,0,0.5), 0 0 0 1px rgba(78,205,196,0.08);
  pointer-events: none;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.aa-tip-popup.aa-tip-popup--visible {
  opacity: 1;
  transform: translateY(0);
}

.aa-tip-popup.aa-tip-popup--funded {
  border-color: rgba(245, 197, 66, 0.3);
}

.aa-tip-popup strong {
  color: var(--accent-teal);
  font-weight: 700;
}

.aa-tip-popup.aa-tip-popup--funded strong {
  color: var(--accent-gold);
}

.aa-tip-popup em {
  color: var(--text-secondary);
  font-style: normal;
  opacity: 0.85;
  display: block;
  margin-top: 4px;
  font-size: 0.7rem;
}

/* --- Model card tooltip modifier --- */
.aa-tip-popup.aa-tip-popup--model {
  border-color: rgba(74, 144, 217, 0.3);
  max-width: 360px;
}

.aa-tip-popup.aa-tip-popup--model strong {
  color: #4A90D9;
  font-weight: 700;
}

/* Hover hint for model cards with tooltip */
.model-card[data-tip] {
  cursor: pointer;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.model-card[data-tip]:hover {
  border-color: rgba(74, 144, 217, 0.4) !important;
  box-shadow: 0 0 16px rgba(74, 144, 217, 0.12);
}

/* Legacy fund-tip — hide (replaced by data-tip system) */
.aa-fund-tip {
  display: none !important;
}

.aa-tool-chip--dvc {
  border: 1px solid var(--accent-gold);
  background: rgba(245, 197, 66, 0.08);
}

.aa-stars {
  color: var(--text-secondary);
  font-size: 0.72rem;
  margin-left: 4px;
}

.aa-dvc-badge {
  font-family: var(--font);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--accent-gold);
  background: rgba(245, 197, 66, 0.15);
  padding: 2px 7px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-left: 6px;
  white-space: nowrap;
}

/* --- Detail: Stat Callout --- */
.aa-detail-stat {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.aa-stat-number {
  font-family: var(--font);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent-teal);
  line-height: 1;
}

.aa-stat-label {
  font-family: var(--font);
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* --- Detail: Note --- */
.aa-detail-note {
  font-family: var(--font);
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-style: italic;
  line-height: 1.5;
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--layer-color, var(--accent-teal));
}

/* ═══════════════════════════════════
   BLOCK 2: STARTUP VS ENTERPRISE
   ═══════════════════════════════════ */

.aa-compare {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0;
  max-width: 960px;
  margin: 0 auto 3.5rem;
  align-items: start;
}

.aa-compare-col {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
}

.aa-compare-col--startup {
  border-top: 3px solid var(--accent-teal);
}

.aa-compare-col--enterprise {
  border-top: 3px solid var(--accent-gold);
}

.aa-compare-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.aa-compare-header h4 {
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.aa-compare-row {
  padding: 10px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.aa-compare-row:last-child {
  border-bottom: none;
}

.aa-row-dim {
  font-family: var(--font);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.aa-row-val {
  font-family: var(--font);
  font-size: 0.85rem;
  color: var(--text-primary);
  line-height: 1.4;
}

/* --- Callout between columns --- */
.aa-compare-callout {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px 16px;
  gap: 8px;
  align-self: center;
}

.aa-callout-arrow {
  font-size: 1.5rem;
  color: var(--accent-teal);
  font-weight: 700;
  display: none;
}

.aa-callout-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.aa-callout-year {
  font-family: var(--font);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-teal);
}

.aa-callout-pct {
  font-family: var(--font);
  font-size: 0.78rem;
  color: var(--text-primary);
  white-space: nowrap;
}

.aa-callout-divider {
  width: 2px;
  height: 20px;
  background: rgba(255, 255, 255, 0.15);
}

.aa-compare-callout .stat-source {
  font-size: 0.65rem;
  text-align: center;
}

/* ═══════════════════════════════════
   BLOCK 3: OSS AGENT ECOSYSTEM
   ═══════════════════════════════════ */

.aa-oss-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 960px;
  margin: 0 auto 3.5rem;
}

.aa-oss-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 18px 20px;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  border-left: 3px solid transparent;
}

.aa-oss-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  background: var(--bg-card-hover);
}

.aa-oss-card--dvc {
  border-left-color: var(--accent-gold);
}

.aa-oss-header {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.aa-oss-name {
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.aa-oss-group {
  font-family: var(--font);
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.06);
  padding: 2px 8px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.aa-oss-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}

.aa-badge {
  font-family: var(--font);
  font-size: 0.7rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.06);
  padding: 3px 8px;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}

.aa-badge--stars svg {
  flex-shrink: 0;
}

.aa-badge--raised {
  color: var(--accent-gold);
  background: rgba(245, 197, 66, 0.1);
}

.aa-oss-desc {
  font-family: var(--font);
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}

/* ═══════════════════════════════════
   BLOCK 4: THREE PROTOCOLS
   ═══════════════════════════════════ */

.aa-protocols {
  max-width: 960px;
  margin: 0 auto 2rem;
}

.aa-proto-diagram {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 0;
  margin-bottom: 20px;
}

/* --- Protocol Cards --- */
.aa-proto-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}

.aa-proto-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.aa-proto-card--mcp {
  border-top: 3px solid var(--accent-coral);
}

.aa-proto-card--a2a {
  border-top: 3px solid var(--accent-teal);
}

.aa-proto-card--agui {
  border-top: 3px solid var(--accent-gold);
}

.aa-proto-card--dvc {
  border: 1px solid rgba(245, 197, 66, 0.3);
  background: rgba(245, 197, 66, 0.04);
}

.aa-proto-card--dvc.aa-proto-card--agui {
  border-top: 3px solid var(--accent-gold);
}

.aa-proto-icon {
  margin-bottom: 10px;
}

.aa-proto-name {
  font-family: var(--font);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0 0 4px;
}

.aa-proto-role {
  font-family: var(--font);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-teal);
  margin: 0 0 8px;
  letter-spacing: 0.03em;
}

.aa-proto-card--mcp .aa-proto-role {
  color: var(--accent-coral);
}

.aa-proto-card--agui .aa-proto-role {
  color: var(--accent-gold);
}

.aa-proto-desc {
  font-family: var(--font);
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0 0 10px;
}

.aa-proto-stats {
  display: flex;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.aa-proto-backers {
  font-family: var(--font);
  font-size: 0.72rem;
  color: var(--text-secondary);
  margin: 0;
  opacity: 0.7;
}

/* --- Connecting Lines --- */
.aa-proto-line {
  display: flex;
  align-items: center;
  justify-content: center;
}

.aa-proto-line--left,
.aa-proto-line--right {
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, rgba(255,255,255,0.1), rgba(255,255,255,0.25), rgba(255,255,255,0.1));
  position: relative;
}

.aa-proto-line--left::after,
.aa-proto-line--right::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-teal);
  transform: translateY(-50%);
}

.aa-proto-line--left::after {
  right: -3px;
}

.aa-proto-line--right::after {
  left: -3px;
}

/* --- Center: The Agent --- */
.aa-proto-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.aa-proto-center-circle {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  border: 2px solid var(--accent-teal);
  background: rgba(78, 205, 196, 0.08);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.aa-proto-center-circle span {
  font-family: var(--font);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-teal);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --- AG-UI Bottom Section --- */
.aa-proto-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.aa-proto-line--down {
  width: 2px;
  height: 30px;
  background: linear-gradient(180deg, rgba(255,255,255,0.25), rgba(255,255,255,0.1));
  position: relative;
}

.aa-proto-line--down::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 50%;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-gold);
  transform: translateX(-50%);
}

.aa-proto-bottom .aa-proto-card {
  max-width: 320px;
  width: 100%;
}

/* --- Protocol Quote --- */
.aa-proto-quote {
  font-family: var(--font);
  font-size: 1rem;
  color: var(--text-secondary);
  text-align: center;
  font-style: italic;
  line-height: 1.6;
  margin: 2rem auto 0;
  max-width: 700px;
  padding: 20px 24px;
  border-left: 3px solid var(--accent-teal);
  background: rgba(78, 205, 196, 0.04);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* ═══════════════════════════════════
   RESPONSIVE: 900px
   ═══════════════════════════════════ */

@media (max-width: 900px) {
  .aa-oss-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .aa-proto-diagram {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .aa-proto-line--left,
  .aa-proto-line--right {
    width: 2px;
    height: 24px;
    background: linear-gradient(180deg, rgba(255,255,255,0.1), rgba(255,255,255,0.25), rgba(255,255,255,0.1));
    margin: 0 auto;
  }

  .aa-proto-line--left::after,
  .aa-proto-line--right::after {
    top: auto;
    bottom: -3px;
    left: 50%;
    right: auto;
    transform: translateX(-50%);
  }

  .aa-proto-center-circle {
    width: 80px;
    height: 80px;
    margin: 0 auto;
  }

  .aa-compare {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .aa-compare-callout {
    flex-direction: row;
    justify-content: center;
    gap: 16px;
    order: -1;
    padding: 12px 16px;
    background: var(--bg-card);
    border-radius: var(--radius-sm);
  }

  .aa-callout-arrow {
    display: block;
  }

  .aa-callout-divider {
    width: 2px;
    height: 30px;
  }

  .aa-layer-tagline {
    display: none;
  }
}

/* ═══════════════════════════════════
   RESPONSIVE: 600px
   ═══════════════════════════════════ */

@media (max-width: 600px) {
  .aa-section-sub {
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
  }

  .aa-oss-grid {
    grid-template-columns: 1fr;
  }

  .aa-layer-bar {
    padding: 12px 14px;
    gap: 8px;
  }

  .aa-layer-name {
    font-size: 0.85rem;
  }

  .aa-layer-num {
    width: 24px;
    height: 24px;
    font-size: 0.7rem;
  }

  .aa-compare-col {
    border-radius: var(--radius-sm);
  }

  .aa-compare-row {
    padding: 8px 14px;
  }

  .aa-proto-bottom .aa-proto-card {
    max-width: 100%;
  }

  .aa-proto-quote {
    font-size: 0.9rem;
    padding: 14px 16px;
  }

  .aa-detail-tools {
    gap: 6px;
  }

  .aa-tool-chip {
    font-size: 0.72rem;
    padding: 4px 10px;
  }
}

/* ═══════════════════════════════════
   REDUCED MOTION
   ═══════════════════════════════════ */

@media (prefers-reduced-motion: reduce) {
  .aa-layer-detail {
    transition: none;
  }

  .aa-layer-chevron {
    transition: none;
  }

  .aa-oss-card {
    transition: none;
  }

  .aa-proto-card {
    transition: none;
  }
}