:root {
  --bg: #e8edf2;
  --bg-deep: #dfe6ee;
  --surface: #fbfcfd;
  --surface-2: #f3f6f9;
  --ink: #12161e;
  --ink-soft: #3d4654;
  --ink-mute: #6b7585;
  --line: #c5ced9;
  --line-strong: #7d8a9b;
  --privacy: #057a55;
  --privacy-ink: #04553c;
  --privacy-wash: #d6f3e8;
  --compliance: #c2410c;
  --compliance-ink: #9a3412;
  --compliance-wash: #ffedd5;
  --pq: #be123c;
  --pq-ink: #9f1239;
  --pq-wash: #ffe4e6;
  --compat: #1d4ed8;
  --compat-ink: #1e3a8a;
  --compat-wash: #dbeafe;
  --spine: #243447;
  --shadow: 0 1px 0 rgba(18, 22, 30, 0.04);
  --radius: 14px;
  --font-display: "Bricolage Grotesque", "Segoe UI", sans-serif;
  --font-body: "Source Sans 3", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  background:
    radial-gradient(1200px 500px at 12% -10%, #d6f3e8 0%, transparent 55%),
    radial-gradient(900px 420px at 100% 0%, #dbeafe 0%, transparent 50%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
}

.page {
  width: min(1220px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.25rem 0 4rem;
}

.hero {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.75rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.hero-kicker {
  display: inline-block;
  margin-bottom: 0.55rem;
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.2vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
}

.hero-ongoing {
  display: inline-block;
  margin-left: 0.15em;
  color: var(--ink-mute);
  font-size: 0.48em;
  font-weight: 600;
  letter-spacing: 0;
  vertical-align: middle;
}

.hero-lede {
  margin: 0;
  max-width: 46rem;
  color: var(--ink-soft);
  font-size: 1.1rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.28rem 0.7rem;
  border: 1px solid var(--privacy);
  border-radius: 999px;
  background: var(--privacy-wash);
  color: var(--privacy-ink);
  font-size: 0.8rem;
  font-weight: 600;
}

.tag.muted {
  border-color: var(--line);
  background: var(--surface);
  color: var(--ink-mute);
  font-weight: 500;
}

.stage {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  align-items: start;
  margin-bottom: 2.5rem;
}

.diagram-shell,
.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.diagram-shell {
  padding: 1rem 0.85rem 1.1rem;
}

.lane-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 0.55rem;
  padding: 0 0.4rem;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--ink-soft);
  font-size: 0.82rem;
  font-weight: 600;
}

.legend-item i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.legend-item.privacy i {
  background: var(--privacy);
}

.legend-item.compliance i {
  background: var(--compliance);
}

.legend-item.pq i {
  background: var(--pq);
}

.legend-item.compat i {
  background: var(--compat);
}

.diagram-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.diagram-scroll svg {
  display: block;
  width: 100%;
  min-width: 1240px;
  height: auto;
}

/* Fishbone interactions */

.bone,
.bone-rib {
  cursor: pointer;
}

.bone .rib,
.bone-rib .rib {
  fill: none;
  stroke-width: 2.1;
  stroke-linecap: round;
  transition: stroke 140ms ease, stroke-width 140ms ease;
}

.bone.privacy .rib,
.bone-rib.privacy .rib {
  stroke: var(--privacy);
}

.bone.compliance .rib,
.bone-rib.compliance .rib {
  stroke: var(--compliance);
}

.bone.pq .rib,
.bone-rib.pq .rib {
  stroke: var(--pq);
}

.bone.compat .rib,
.bone-rib.compat .rib {
  stroke: var(--compat);
}

.bone .joint,
.bone-rib .joint {
  fill: var(--surface);
  stroke-width: 1.7;
  transition: stroke 140ms ease, fill 140ms ease;
}

.bone .plate {
  fill: #ffffff;
  stroke: var(--line);
  stroke-width: 1;
  transition: stroke 140ms ease, fill 140ms ease;
}

.bone .plate-id {
  fill: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
}

.bone .plate-label {
  fill: var(--ink);
  font-family: var(--font-display);
  font-size: 12.5px;
  font-weight: 700;
}

.bone .plate-artifacts {
  fill: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 500;
}

.bone.privacy.is-active .plate-artifacts,
.bone.privacy:hover .plate-artifacts {
  fill: var(--privacy-ink);
}

.bone.compliance.is-active .plate-artifacts,
.bone.compliance:hover .plate-artifacts {
  fill: var(--compliance-ink);
}

.bone.pq.is-active .plate-artifacts,
.bone.pq:hover .plate-artifacts {
  fill: var(--pq-ink);
}

.bone.compat.is-active .plate-artifacts,
.bone.compat:hover .plate-artifacts {
  fill: var(--compat-ink);
}

.bone.privacy .joint,
.bone-rib.privacy .joint {
  stroke: var(--privacy);
}

.bone.compliance .joint,
.bone-rib.compliance .joint {
  stroke: var(--compliance);
}

.bone.pq .joint,
.bone-rib.pq .joint {
  stroke: var(--pq);
}

.bone.compat .joint,
.bone-rib.compat .joint {
  stroke: var(--compat);
}

.bone:hover .rib,
.bone.is-active .rib,
.bone-rib:hover .rib,
.bone-rib.is-active .rib {
  stroke-width: 2.5;
}

.bone.privacy:hover .rib,
.bone.privacy.is-active .rib,
.bone-rib.privacy:hover .rib,
.bone-rib.privacy.is-active .rib {
  stroke: var(--privacy);
}

.bone.compliance:hover .rib,
.bone.compliance.is-active .rib,
.bone-rib.compliance:hover .rib,
.bone-rib.compliance.is-active .rib {
  stroke: var(--compliance);
}

.bone.pq:hover .rib,
.bone.pq.is-active .rib,
.bone-rib.pq:hover .rib,
.bone-rib.pq.is-active .rib {
  stroke: var(--pq);
}

.bone.compat:hover .rib,
.bone.compat.is-active .rib,
.bone-rib.compat:hover .rib,
.bone-rib.compat.is-active .rib {
  stroke: var(--compat);
}

.bone.privacy:hover .joint,
.bone.privacy.is-active .joint,
.bone-rib.privacy:hover .joint,
.bone-rib.privacy.is-active .joint {
  fill: var(--privacy-wash);
  stroke: var(--privacy);
}

.bone.compliance:hover .joint,
.bone.compliance.is-active .joint,
.bone-rib.compliance:hover .joint,
.bone-rib.compliance.is-active .joint {
  fill: var(--compliance-wash);
  stroke: var(--compliance);
}

.bone.pq:hover .joint,
.bone.pq.is-active .joint,
.bone-rib.pq:hover .joint,
.bone-rib.pq.is-active .joint {
  fill: var(--pq-wash);
  stroke: var(--pq);
}

.bone.compat:hover .joint,
.bone.compat.is-active .joint,
.bone-rib.compat:hover .joint,
.bone-rib.compat.is-active .joint {
  fill: var(--compat-wash);
  stroke: var(--compat);
}

.bone.privacy:hover .plate,
.bone.privacy.is-active .plate {
  fill: var(--privacy-wash);
  stroke: var(--privacy);
}

.bone.compliance:hover .plate,
.bone.compliance.is-active .plate {
  fill: var(--compliance-wash);
  stroke: var(--compliance);
}

.bone.pq:hover .plate,
.bone.pq.is-active .plate {
  fill: var(--pq-wash);
  stroke: var(--pq);
}

.bone.compat:hover .plate,
.bone.compat.is-active .plate {
  fill: var(--compat-wash);
  stroke: var(--compat);
}

.bone.privacy:hover .plate-id,
.bone.privacy.is-active .plate-id {
  fill: var(--privacy);
}

.bone.compliance:hover .plate-id,
.bone.compliance.is-active .plate-id {
  fill: var(--compliance);
}

.bone.pq:hover .plate-id,
.bone.pq.is-active .plate-id {
  fill: var(--pq);
}

.bone.compat:hover .plate-id,
.bone.compat.is-active .plate-id {
  fill: var(--compat);
}

.bone:focus {
  outline: none;
}

.bone:focus-visible .plate {
  stroke-width: 2;
}

/* Detail panel */

.panel {
  position: static;
  padding: 1.15rem 1.2rem 1.35rem;
  min-height: 0;
  color: var(--ink);
  background: var(--surface);
  transition: border-color 180ms ease;
}

.panel.is-privacy {
  border-color: color-mix(in srgb, var(--privacy) 45%, var(--line));
}

.panel.is-compliance {
  border-color: color-mix(in srgb, var(--compliance) 45%, var(--line));
}

.panel.is-pq {
  border-color: color-mix(in srgb, var(--pq) 45%, var(--line));
}

.panel.is-compat {
  border-color: color-mix(in srgb, var(--compat) 45%, var(--line));
}

.panel-top {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  margin-bottom: 0.75rem;
}

.panel-lane {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  margin-top: 0.2rem;
  min-height: 1.55rem;
  padding: 0.15rem 0.55rem;
  border-radius: 6px;
  background: var(--surface-2);
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.panel.is-privacy .panel-lane {
  background: var(--privacy-wash);
  color: var(--privacy-ink);
}

.panel.is-compliance .panel-lane {
  background: var(--compliance-wash);
  color: var(--compliance-ink);
}

.panel.is-pq .panel-lane {
  background: var(--pq-wash);
  color: var(--pq-ink);
}

.panel.is-compat .panel-lane {
  background: var(--compat-wash);
  color: var(--compat-ink);
}

.panel-close {
  appearance: none;
  flex: 0 0 auto;
  margin-left: auto;
  margin-top: 0.25rem;
  border: 0;
  background: transparent;
  color: var(--ink-mute);
  font-family: var(--font-body);
  font-size: 0.8rem;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.panel-close:hover {
  color: var(--ink);
}

.panel-top h2,
.panel h2 {
  flex: 1 1 auto;
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--ink);
}

.panel-detail {
  margin: 0;
  color: #2a3340;
  font-size: 0.98rem;
  line-height: 1.6;
}

.panel-related {
  margin-top: 1.15rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.panel-related-title {
  margin: 0 0 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.panel-related-list {
  display: grid;
  gap: 0.75rem;
}

.related-item {
  padding: 0.75rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-2);
}

.related-link {
  display: inline-block;
  margin-bottom: 0.35rem;
  color: var(--privacy-ink);
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.panel.is-compliance .related-link {
  color: var(--compliance-ink);
}

.panel.is-pq .related-link {
  color: var(--pq-ink);
}

.panel.is-compat .related-link {
  color: var(--compat-ink);
}

.related-link:hover {
  opacity: 0.85;
}

.related-link-plain {
  text-decoration: none;
  cursor: default;
}

.related-link-plain:hover {
  opacity: 1;
}

.related-links {
  margin: 0.35rem 0 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.45;
}

.related-links a {
  color: var(--privacy-ink);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.panel.is-compliance .related-links a {
  color: var(--compliance-ink);
}

.panel.is-pq .related-links a {
  color: var(--pq-ink);
}

.panel.is-compat .related-links a {
  color: var(--compat-ink);
}

.related-links-sep {
  color: var(--ink-mute);
}

.related-summary {
  margin: 0;
  color: #2a3340;
  font-size: 0.88rem;
  line-height: 1.55;
}

.related-points {
  margin: 0.15rem 0 0;
  padding-left: 1.1rem;
  color: #2a3340;
  font-size: 0.88rem;
  line-height: 1.45;
}

.related-points li + li {
  margin-top: 0.28rem;
}

.panel-refs {
  margin: 1rem 0 0;
  padding-top: 0.85rem;
  border-top: 1px solid var(--line);
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  word-break: break-word;
}

.panel-refs a {
  color: var(--compat);
}

.panel.is-privacy .panel-refs a {
  color: var(--privacy);
}

.panel.is-compliance .panel-refs a {
  color: var(--compliance);
}

.panel.is-pq .panel-refs a {
  color: var(--pq);
}

.panel-detail.is-enter,
.panel h2.is-enter {
  animation: rise 220ms ease;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 640px) {
  .page {
    width: min(100% - 1.25rem, 1220px);
    padding-top: 1.5rem;
  }

  .hero-lede {
    font-size: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .panel-detail.is-enter,
  .panel h2.is-enter,
  .bone .rib,
  .bone .plate {
    animation: none;
    transition: none;
  }
}