/* inferpd journey site: v1 */

:root {
  --bg: #0c0f14;
  --bg-elevated: #141922;
  --bg-card: #1a2030;
  --border: #2a3348;
  --text: #e6eaf2;
  --text-muted: #8b95a8;
  --accent: #d4a054;
  --accent-dim: #a67c3a;
  --success: #5cb88a;
  --fail: #e07070;
  --warn: #e8b84a;
  --link: #7eb8ff;
  --prefill: rgba(96, 165, 250, 0.95);
  --decode: rgba(251, 191, 36, 0.95);
  --shared: rgba(74, 222, 128, 0.95);
  --shared-bg: rgba(74, 222, 128, 0.1);
  --shared-border: rgba(74, 222, 128, 0.35);
  --on-accent: #1a1208;
  --grid-line: rgba(255, 255, 255, 0.06);
  --row-hover: rgba(255, 255, 255, 0.02);
  --header-bg: rgba(12, 15, 20, 0.92);
  --accent-soft: rgba(212, 160, 84, 0.1);
  --accent-soft-hover: rgba(212, 160, 84, 0.08);
  --accent-soft-border: rgba(212, 160, 84, 0.35);
  --card-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  --card-shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.35);
  --thumb-gradient-end: #1e2838;
  --tldr-bg: linear-gradient(135deg, rgba(212, 160, 84, 0.14), rgba(92, 184, 138, 0.07));
  --body-gradient-1: rgba(212, 160, 84, 0.08);
  --body-gradient-2: rgba(126, 184, 255, 0.05);
  --font-serif: "Literata", Georgia, serif;
  --font-sans: "Inter", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --radius: 8px;
  --max-prose: 42rem;
  --max-wide: 56rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--body-gradient-1), transparent),
    radial-gradient(ellipse 60% 40% at 100% 0%, var(--body-gradient-2), transparent);
  min-height: 100vh;
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:hover {
  color: var(--accent);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 1.1rem;
}

/* Main layout */
main {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.prose {
  max-width: var(--max-prose);
}

.prose-wide {
  max-width: var(--max-wide);
}

/* Hero */
.hero {
  padding: 2.5rem 0 3rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.hero-compact {
  padding-bottom: 2rem;
  margin-bottom: 2rem;
}

.text-muted {
  color: var(--text-muted);
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin: 0 0 0.75rem;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.hero-lead {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 36rem;
  margin: 0 0 1.5rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.15rem;
  border-radius: var(--radius);
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid var(--border);
  transition: background 0.15s, border-color 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: var(--on-accent);
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-dim);
  border-color: var(--accent-dim);
  color: var(--on-accent);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Typography */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

h2 {
  font-size: 1.65rem;
  margin: 2.5rem 0 1rem;
  padding-top: 0.5rem;
}

h3 {
  font-size: 1.2rem;
  margin: 1.75rem 0 0.65rem;
}

h4 {
  font-size: 1.05rem;
  margin: 1.25rem 0 0.5rem;
}

p {
  margin: 0 0 1rem;
}

.lead {
  font-size: 1.12rem;
  color: var(--text-muted);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

/* Cards & grids */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.card h3 {
  margin-top: 0;
  font-size: 1.05rem;
}

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

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
  margin: 1.25rem 0;
}

.stat {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--accent);
  display: block;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  display: block;
}

/* Timeline */
.timeline {
  position: relative;
  margin: 2rem 0;
  padding-left: 1.5rem;
  border-left: 2px solid var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: 2rem;
  padding-left: 1.25rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 0.35rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  transform: translateX(-5px);
}

.timeline-item.fail::before {
  border-color: var(--fail);
}

.timeline-item.success::before {
  border-color: var(--success);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.timeline-item h3 {
  margin: 0.25rem 0 0.5rem;
}

.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-right: 0.35rem;
  vertical-align: middle;
}

.badge-success {
  background: rgba(92, 184, 138, 0.15);
  color: var(--success);
}

.badge-fail {
  background: rgba(224, 112, 112, 0.15);
  color: var(--fail);
}

.badge-warn {
  background: rgba(232, 184, 74, 0.15);
  color: var(--warn);
}

.badge-neutral {
  background: rgba(139, 149, 168, 0.15);
  color: var(--text-muted);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: 1rem 0 1.5rem;
}

th, td {
  text-align: left;
  padding: 0.65rem 0.85rem;
  border-bottom: 1px solid var(--border);
}

th {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  font-weight: 500;
}

tr:hover td {
  background: var(--row-hover);
}

.table-wrap {
  overflow-x: auto;
  margin: 1rem 0;
}

.table-wide table {
  font-size: 0.85rem;
}

.table-wide th,
.table-wide td {
  padding: 0.55rem 0.65rem;
  vertical-align: top;
}

/* Code & formulas */
code, .formula {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-elevated);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--border);
}

pre.formula-block {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  overflow-x: auto;
  line-height: 1.5;
  margin: 1rem 0;
}

/* Resource links */
.resource-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.resource-list li {
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  align-items: baseline;
}

.resource-list li:last-child {
  border-bottom: none;
}

.resource-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  min-width: 5rem;
}

/* Tier blocks (learn page) */
.tier-diagram {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  overflow-x: auto;
  line-height: 1.7;
  margin: 1rem 0 2rem;
  white-space: pre;
}

.tier-block {
  margin: 2rem 0;
  padding: 1.25rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.tier-block h3 {
  margin-top: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tier-block .tier-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  background: rgba(212, 160, 84, 0.15);
  border-radius: 4px;
  font-size: 0.85rem;
}

.tier-sub {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin: -0.25rem 0 1rem;
}

.resource-category {
  margin: 2rem 0;
}

.resource-category h3 {
  margin-top: 0;
  font-size: 1.1rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

.resource-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  flex: 1;
  min-width: 12rem;
}

.tier {
  margin: 2.5rem 0;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.tier-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.tier-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
}

.step-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.step-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.75rem;
}

.step-list li:last-child {
  border-bottom: none;
}

.step-num {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Callout */
.callout {
  border-left: 3px solid var(--accent);
  background: var(--bg-card);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.callout-warn {
  border-left-color: var(--warn);
}

.callout-success {
  border-left-color: var(--success);
}

.prose-wide ul {
  margin: 0 0 1rem;
  padding-left: 1.35rem;
}

.prose-wide li {
  margin-bottom: 0.5rem;
}

.prose-wide li strong {
  color: var(--text);
}

/* Clickable video / paper cards */
.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0 2rem;
}

.media-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}

.media-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--card-shadow);
}

.media-card:hover h3 {
  color: var(--accent);
}

.media-card-thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--bg-elevated);
  overflow: hidden;
}

.media-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media-card-thumb-paper {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-elevated) 0%, var(--thumb-gradient-end) 100%);
}

.media-card-paper-label,
.media-card-kind-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.media-card-thumb-paper,
.media-card-thumb-doc,
.media-card-thumb-repo,
.media-card-thumb-hub,
.media-card-thumb-community {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--bg-elevated) 0%, var(--thumb-gradient-end) 100%);
}

.media-card-thumb-paper {
  background: linear-gradient(135deg, var(--bg-elevated) 0%, var(--thumb-gradient-end) 100%);
}

.media-card-thumb-repo {
  background: linear-gradient(135deg, #151922 0%, #0d1117 100%);
}

.media-card-thumb-hub {
  background: linear-gradient(135deg, #2a1f14 0%, #121018 100%);
}

.media-card-thumb-community {
  background: linear-gradient(135deg, #2a1810 0%, #121018 100%);
}

.media-card-site-icon {
  width: 3rem;
  height: 3rem;
  border-radius: 10px;
  object-fit: contain;
  background: rgba(255, 255, 255, 0.06);
  padding: 0.35rem;
}

.media-card-play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: rgba(255, 255, 255, 0.92);
  background: rgba(0, 0, 0, 0.25);
  opacity: 0;
  transition: opacity 0.15s;
  pointer-events: none;
}

.media-card-video:hover .media-card-play {
  opacity: 1;
}

.media-grid-compact {
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  margin-bottom: 2.5rem;
}

.media-card-thumb-ai {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1a2438 0%, #0f1520 100%);
}

.media-card-ai-deepseek .media-card-thumb-ai {
  background: linear-gradient(135deg, #0d2847 0%, #061018 55%, #0a2a3a 100%);
}

.media-card-ai-chatgpt .media-card-thumb-ai {
  background: linear-gradient(135deg, #0f3d2e 0%, #061018 55%, #143328 100%);
}

.media-card-ai-claude .media-card-thumb-ai {
  background: linear-gradient(135deg, #4a2818 0%, #120c0a 55%, #3d2215 100%);
}

.media-card-ai-icon {
  width: 4.5rem;
  height: 4.5rem;
  border-radius: 14px;
  box-shadow: var(--card-shadow-sm);
  position: relative;
  z-index: 1;
}

.media-card-open {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.95);
  background: rgba(0, 0, 0, 0.45);
  opacity: 0;
  transition: opacity 0.15s;
  pointer-events: none;
}

.media-card-ai:hover .media-card-open {
  opacity: 1;
}

.learning-method {
  margin: 0 0 2rem;
  padding-left: 1.35rem;
}

.learning-method li {
  margin-bottom: 0.65rem;
  line-height: 1.55;
}

.story-block {
  margin: 2rem 0 2.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.story-block h3 {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
}

.story-block p:last-child,
.story-block ul:last-child {
  margin-bottom: 0;
}

.story-block ul {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
}

.contrast-grid {
  display: grid;
  gap: 1rem;
  margin: 1rem 0 0;
}

@media (min-width: 640px) {
  .contrast-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.contrast-card {
  padding: 1rem 1.15rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
}

.contrast-card h4 {
  margin: 0 0 0.5rem;
  font-size: 0.95rem;
  color: var(--accent);
}

.contrast-card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--text-muted);
}

.chat-topic-table td:first-child {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.media-card-body {
  padding: 0.85rem 1rem 1rem;
  flex: 1;
}

.media-card-channel {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin: 0 0 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.media-card-body h3 {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.35;
  margin: 0 0 0.4rem;
  transition: color 0.15s;
}

.media-card-note {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.45;
}

/* Results page */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1rem 0 2rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}

.stat-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.35rem;
}

.stat-value {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

.stack-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0 1.25rem;
}

.stack-btn {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-muted);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.stack-btn:hover,
.stack-btn.active {
  border-color: var(--accent);
  color: var(--text);
}

.stack-btn.active {
  background: var(--accent-soft);
}

.stack-btn-highlight {
  border-color: var(--accent-soft-border);
}

.stack-btn-nodata {
  opacity: 0.72;
}

.stack-btn-phase {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  letter-spacing: 0.04em;
  display: block;
  margin-bottom: 0.15rem;
}

.results-journey {
  list-style: none;
  margin: 1.25rem 0 2rem;
  padding: 0;
  border-left: 2px solid var(--border);
}

.results-journey-item {
  margin: 0 0 0 0.85rem;
  padding: 0 0 0.85rem;
  position: relative;
}

.results-journey-item::before {
  content: "";
  position: absolute;
  left: -1.15rem;
  top: 0.65rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--border);
  border: 2px solid var(--bg);
}

.results-journey-item.active::before {
  background: var(--accent);
}

.results-journey-item.no-data::before {
  background: rgba(148, 163, 184, 0.5);
}

.results-journey-btn {
  display: block;
  width: 100%;
  text-align: left;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-muted);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.results-journey-btn:hover,
.results-journey-item.active .results-journey-btn {
  border-color: var(--accent);
  background: var(--accent-soft-hover);
  color: var(--text);
}

.results-journey-phase {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.2rem;
}

.results-journey-btn strong {
  display: block;
  color: var(--text);
  font-size: 0.98rem;
  margin-bottom: 0.25rem;
}

.results-journey-summary {
  display: block;
  font-size: 0.84rem;
  line-height: 1.45;
  margin-bottom: 0.35rem;
}

.results-journey-stat {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.results-journey-stat strong {
  display: inline;
  color: var(--accent);
  font-size: inherit;
}

.insight-list {
  display: grid;
  gap: 0;
  margin: 1.5rem 0 2rem;
}

.insight-item {
  display: grid;
  grid-template-columns: 2.75rem 1fr;
  gap: 1rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--border);
}

.insight-item:first-child {
  border-top: 1px solid var(--border);
}

.insight-item h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.insight-item p {
  margin: 0;
  color: var(--text-muted);
}

.insight-num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
  line-height: 1.2;
}

.insight-steps {
  margin: 0 0 2rem;
  padding-left: 1.25rem;
  color: var(--text-muted);
  line-height: 1.65;
}

.insight-steps li {
  margin-bottom: 0.65rem;
}

.insight-rules {
  margin-top: 0.5rem;
}

.insight-rules .stat-value {
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}

.stack-meta {
  margin-bottom: 1.5rem;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.stack-meta strong {
  color: var(--text);
}

.stack-meta-head {
  margin-bottom: 0.85rem;
}

.stack-meta-title {
  margin: 0 0 0.35rem;
  font-size: 1.15rem;
  line-height: 1.35;
}

.stack-meta-topology {
  margin: 0 0 0.35rem;
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--text-muted);
}

.stack-meta-topology strong {
  color: var(--text);
  font-weight: 600;
}

.stack-meta-plain {
  margin: 0;
  font-size: 0.88rem;
  color: var(--accent);
  font-family: var(--font-mono);
}

.topology-badge {
  font-size: 0.88em;
  padding: 0.1rem 0.45rem;
  border-radius: 4px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-soft-border);
  color: var(--accent);
}

.stack-meta-facts {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.35rem 1rem;
  margin: 0.85rem 0 0;
  font-size: 0.84rem;
  line-height: 1.5;
}

.stack-meta-facts dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.stack-meta-facts dd {
  margin: 0;
  color: var(--text-muted);
}

.topology-legend-wrap {
  margin-bottom: 1.25rem;
}

.topology-legend {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.topology-legend p {
  margin: 0 0 0.5rem;
}

.topology-legend-list {
  margin: 0 0 0.85rem;
  padding-left: 1.15rem;
  line-height: 1.6;
}

.topology-legend-list li {
  margin-bottom: 0.25rem;
}

.topology-legend-mini {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.65rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--border);
}

.topology-legend-mini .gpu-chip-icon {
  width: 1.4rem;
  height: 1.65rem;
}

.topology-legend-mini-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  width: 100%;
}

.topology-legend code {
  font-size: 0.92em;
}

.legend-inline {
  color: var(--prefill);
}

.legend-decode {
  color: var(--decode);
}

.gpu-topology {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem 0.85rem;
  padding: 1rem 1.1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.gpu-pool {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  min-width: 4.5rem;
}

.gpu-pool-role {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.gpu-pool-hint {
  font-size: 0.68rem;
  color: var(--text-muted);
  text-align: center;
}

.gpu-pool-prefill .gpu-pool-role {
  color: var(--prefill);
}

.gpu-pool-decode .gpu-pool-role {
  color: var(--decode);
}

.gpu-pool-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.35rem;
  max-width: 12rem;
}

.gpu-pool-count {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.gpu-chip {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  color: var(--text);
}

.gpu-pool-prefill .gpu-chip {
  color: var(--prefill);
}

.gpu-pool-decode .gpu-chip {
  color: var(--decode);
}

.gpu-chip-icon {
  width: 2rem;
  height: 2.35rem;
  display: block;
}

.gpu-chip-label {
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  opacity: 0.85;
}

.gpu-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.1rem;
  padding: 0 0.25rem;
  color: var(--text-muted);
}

.gpu-flow-arrow {
  font-size: 1.25rem;
  line-height: 1;
}

.gpu-flow-kv {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.gpu-flow-step {
  font-size: 0.62rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.gpu-topology-note {
  width: 100%;
  margin: 0.35rem 0 0;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: center;
}

.gpu-shared-l1 {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  margin-left: auto;
  padding-left: 0.75rem;
  border-left: 1px dashed var(--border);
}

.gpu-shared-l1-box {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.35rem 0.55rem;
  border-radius: 4px;
  background: var(--shared-bg);
  border: 1px solid var(--shared-border);
  color: var(--shared);
}

.gpu-shared-l1-hint {
  font-size: 0.68rem;
  color: var(--text-muted);
  text-align: center;
  max-width: 5.5rem;
}

.headline-tag {
  margin: 0 0 0.5rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.headline-takeaways ul {
  margin-top: 0;
}

@media (max-width: 640px) {
  .gpu-topology {
    flex-direction: column;
    align-items: stretch;
  }

  .gpu-flow {
    flex-direction: row;
    justify-content: center;
    padding: 0.25rem 0;
  }

  .gpu-shared-l1 {
    margin-left: 0;
    padding-left: 0;
    border-left: none;
    border-top: 1px dashed var(--border);
    padding-top: 0.75rem;
  }
}

.hidden {
  display: none !important;
}

.chart-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0 2rem;
}

.chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem 1.1rem;
}

.chart-card h3 {
  margin: 0 0 0.25rem;
  font-size: 0.95rem;
}

.chart-caption {
  margin: 0 0 0.75rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.chart-wrap {
  position: relative;
  height: 240px;
}

.chart-footnote {
  margin: -0.75rem 0 1.75rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.chart-wrap-tall {
  height: 320px;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.25rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.site-footer a {
  color: var(--text-muted);
}

.site-footer a:hover {
  color: var(--accent);
}

/* Story arc on index */
.story-arc {
  display: grid;
  gap: 0;
  margin: 2rem 0;
}

.story-step {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}

.story-step:last-child {
  border-bottom: none;
}

.story-num {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--accent-dim);
  line-height: 1;
}

/* Progressive disclosure: collapsible deep-dive sections */
.collapsible {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  margin: 1.25rem 0 2rem;
}

.collapsible > summary {
  cursor: pointer;
  padding: 0.9rem 1.1rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--accent);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  user-select: none;
}

.collapsible > summary::-webkit-details-marker {
  display: none;
}

.collapsible > summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1;
  color: var(--accent-dim);
  transition: transform 0.15s ease;
}

.collapsible[open] > summary::before {
  content: "-";
}

.collapsible > summary:hover {
  color: var(--text);
}

.collapsible > summary:hover::before {
  color: var(--accent);
}

.collapsible > :not(summary) {
  margin-left: 1.1rem;
  margin-right: 1.1rem;
}

.collapsible > :not(summary):last-child {
  margin-bottom: 1.25rem;
}

.collapsible .table-wrap {
  margin-top: 0.25rem;
}

/* Story dashboard tiles (helicopter view) */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin: 0 0 2.25rem;
}

.dashboard-tile {
  display: block;
  padding: 1rem 1.1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.dashboard-tile:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.dashboard-tile-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--accent);
  margin-bottom: 0.35rem;
}

.dashboard-tile-value {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1.2;
}

.dashboard-tile-note {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
  line-height: 1.45;
}

/* Single-page pitch */
.pitch-page .section-label {
  margin-top: 2.5rem;
}

.pitch-tried-table th,
.pitch-tried-table td {
  vertical-align: top;
}

.pitch-tried-table td {
  line-height: 1.45;
  max-width: 18rem;
}

.pitch-tried-table td:first-child {
  font-weight: 600;
  white-space: nowrap;
}

@media (max-width: 760px) {
  .pitch-tried-table td:first-child {
    white-space: normal;
  }
}

.pitch-tried-table tr.pitch-tried-win td {
  background: rgba(212, 160, 84, 0.08);
}

.pitch-page .stat-vs {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.78rem;
  color: var(--accent);
  line-height: 1.35;
}

.stat-grid-single {
  grid-template-columns: 1fr;
  max-width: 280px;
}

.stat-featured .stat-value {
  font-size: 2.4rem;
}

.pitch-deep-links {
  list-style: none;
  margin: 0 0 1.75rem;
  padding: 0;
}

.pitch-deep-links li {
  margin: 0.45rem 0;
}

.pitch-deep-links a {
  color: var(--link);
}

.nav-links-minimal {
  gap: 0.35rem;
}

/* Results TL;DR banner */
.tldr-banner {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.9rem;
  align-items: start;
  padding: 1.05rem 1.25rem;
  margin-bottom: 1.75rem;
  background: var(--tldr-bg);
  border: 1px solid var(--accent-soft-border);
  border-radius: var(--radius);
}

.tldr-banner p {
  margin: 0;
  grid-column: 2;
  font-size: 0.98rem;
}

.tldr-banner p + p {
  margin-top: 0.65rem;
}

.tldr-label {
  grid-row: 1 / -1;
  align-self: start;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--on-accent);
  background: var(--accent);
  padding: 0.22rem 0.55rem;
  border-radius: 4px;
  margin-top: 0.15rem;
}

/* Insight rule icons */
.insight-icon {
  display: inline-flex;
  margin-bottom: 0.55rem;
  color: var(--accent);
}

.insight-icon svg {
  width: 22px;
  height: 22px;
}

/* Keyboard focus: visible on every interactive element */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Reduced motion: no smooth scroll, no decorative transitions */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (max-width: 760px) {
  .dashboard-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .tldr-banner {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .tldr-label {
    grid-row: auto;
  }

  .tldr-banner p {
    grid-column: auto;
  }
}

@media (max-width: 640px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 0.75rem 1.25rem;
  }

  .nav-links.open {
    display: flex;
  }

  .header-inner {
    position: relative;
    flex-wrap: wrap;
  }

  .hero {
    padding: 1.5rem 0 2rem;
  }

  .story-step {
    grid-template-columns: 2rem 1fr;
  }
}

/* ---------------------------------------------------------------
   Added in review pass: scope notes, architecture diagram,
   repo link in nav, structured footer.
   --------------------------------------------------------------- */

/* Honest-scope note: sits under a headline claim and qualifies it. */
.scope-note {
  margin: 1.25rem 0 2rem;
  padding: 0.95rem 1.1rem;
  border-left: 3px solid var(--accent-dim);
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}
.scope-note strong {
  color: var(--text);
}

/* Architecture diagram */
.arch-figure {
  margin: 2rem 0;
  padding: 1.25rem 1rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow-sm);
}
.arch-svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}
.arch-figure figcaption {
  margin-top: 1rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.6;
}
.arch-figure figcaption strong {
  color: var(--text);
}

.arch-box {
  fill: var(--bg-elevated);
  stroke: var(--border);
  stroke-width: 1.2;
}
.arch-box-proxy {
  stroke: var(--accent-dim);
}
.arch-box-prefill {
  stroke: var(--prefill);
  fill: rgba(96, 165, 250, 0.07);
}
.arch-box-decode {
  stroke: var(--decode);
  fill: rgba(251, 191, 36, 0.07);
}
.arch-box-shared {
  stroke: var(--shared);
  stroke-width: 1.6;
  fill: var(--shared-bg);
}
.arch-label {
  fill: var(--text);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  text-anchor: middle;
}
.arch-label-shared {
  fill: var(--shared);
  font-family: var(--font-mono);
  font-size: 13.5px;
}
.arch-sub {
  fill: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 11.5px;
  text-anchor: middle;
}
.arch-sub-key {
  fill: var(--shared);
  font-weight: 600;
}
.arch-edge {
  fill: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  text-anchor: middle;
}
.arch-edge-write {
  fill: var(--prefill);
}
.arch-edge-read {
  fill: var(--decode);
}
.arch-arrow {
  stroke: var(--text-muted);
  stroke-width: 1.4;
  fill: none;
}
.arch-arrow-write {
  stroke: var(--prefill);
}
.arch-arrow-read {
  stroke: var(--decode);
}
.arch-arrowhead {
  fill: var(--text-muted);
}

/* External profile / repo links in the nav */
.nav-links .nav-repo {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 0.18rem 0.55rem;
  border: 1px solid var(--accent-soft-border);
  border-radius: 999px;
}
.nav-links .nav-repo:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

/* Footer */
.site-footer .footer-nav {
  margin: 0 0 0.9rem;
}
.site-footer .footer-meta {
  margin: 0 0 0.9rem;
}
.site-footer .footer-meta a {
  color: var(--link);
}
.site-footer .footer-meta strong {
  color: var(--text);
}
.site-footer .footer-fine {
  margin: 0 auto;
  max-width: 46rem;
  font-size: 0.8rem;
  opacity: 0.75;
  line-height: 1.55;
}

@media (max-width: 640px) {
  .arch-figure {
    padding: 0.85rem 0.6rem 0.75rem;
  }
  .arch-svg {
    min-width: 520px;
  }
  .arch-figure {
    overflow-x: auto;
  }
}