/* ============================================================
   PEQ Rule Engine — Page-specific styles
   ============================================================ */

/* ---------- Home: hero ---------- */
.hero {
  position: relative;
  padding: 84px 0 72px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 100% 56px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 56px 100%,
    radial-gradient(1000px 480px at 78% -60px, rgba(30, 91, 214, 0.08), transparent 62%),
    var(--bg);
  background-size: 100% 56px, 56px 100%, auto, auto;
}

[data-theme="dark"] .hero {
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 100% 56px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 56px 100%,
    radial-gradient(1000px 480px at 78% -60px, rgba(106, 154, 245, 0.1), transparent 62%),
    var(--bg);
  background-size: 100% 56px, 56px 100%, auto, auto;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--bg-elev);
  box-shadow: var(--shadow-sm);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--teal-deep);
  margin-bottom: 26px;
}

.hero-badge .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--teal);
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.7rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.08;
  color: var(--ink);
}

.hero h1 .accent {
  color: var(--cobalt);
}

.hero .subtitle {
  margin-top: 14px;
  font-size: var(--fs-lg);
  font-weight: 600;
  color: var(--ink-3);
  letter-spacing: 0.01em;
}

.hero .desc {
  margin-top: 26px;
  font-size: var(--fs-xl);
  line-height: 1.75;
  color: var(--ink-2);
  max-width: 560px;
}

.hero .desc strong {
  color: var(--ink);
  font-weight: 700;
}

.hero-cta {
  margin-top: 34px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-principles {
  margin-top: 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.hero-principles span::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
  margin-right: 8px;
  vertical-align: 1px;
}

/* hero flow (animated vertical pipeline) */
.hero-flow-wrap {
  display: flex;
  justify-content: center;
}

.hero-flow {
  width: min(320px, 100%);
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-md);
  padding: 22px 20px;
}

.flow-node {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: var(--bg-soft);
  color: var(--ink-2);
  font-size: var(--fs-sm);
  font-weight: 600;
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease), color 0.35s var(--ease), transform 0.35s var(--ease);
}

.flow-node .icon {
  color: var(--ink-4);
  transition: color 0.35s var(--ease);
}

.flow-node small {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ink-4);
  opacity: 0;
  transition: opacity 0.35s var(--ease);
}

.flow-node.is-lit {
  background: var(--navy);
  border-color: var(--navy);
  color: #fff;
  transform: translateX(4px);
}

.flow-node.is-lit .icon {
  color: #6fd3de;
}

.flow-node.is-lit small {
  opacity: 0.85;
  color: #9fc4ff;
}

.flow-connector {
  width: 2px;
  height: 14px;
  margin: 2px auto;
  background: var(--line-strong);
}

.flow-node.is-lit + .flow-connector {
  background: var(--cobalt);
}

/* ---------- Home: comparison ---------- */
.compare-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  align-items: stretch;
}

.compare-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 28px 26px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--bg-elev);
}

.compare-card--featured {
  background: var(--navy);
  border-color: var(--navy);
  color: #dbe6f8;
  box-shadow: var(--shadow-md);
}

.compare-card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: var(--fs-lg);
  margin-bottom: 6px;
}

.compare-card--featured .compare-card-head {
  color: #fff;
}

.compare-card li {
  display: flex;
  gap: 9px;
  font-size: var(--fs-sm);
  line-height: 1.6;
  color: var(--ink-2);
}

.compare-card--featured li {
  color: #c6d6f0;
}

.compare-card li::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--ink-4);
  margin-top: 9px;
  flex-shrink: 0;
}

.compare-card--featured li::before {
  background: var(--cyan);
}

.compare-card .tag-line {
  margin-top: auto;
  padding-top: 14px;
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--teal-deep);
  text-transform: uppercase;
}

.compare-card--featured .tag-line {
  color: #6fd3de;
}

/* ---------- Home: core loop ---------- */
.core-loop {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 0;
  justify-content: center;
}

.loop-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 18px 20px;
  min-width: 116px;
  text-align: center;
}

.loop-node .icon-tile {
  transition: transform 0.2s var(--ease);
}

.loop-node:hover .icon-tile {
  transform: translateY(-3px);
}

.loop-node-label {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--ink);
}

.loop-node-sub {
  font-size: var(--fs-xs);
  color: var(--ink-3);
}

.loop-arrow {
  align-self: center;
  color: var(--ink-4);
  display: flex;
  align-items: center;
}

/* ---------- Home: durable asset ---------- */
.durable-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.durable-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--bg-elev);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--ink-2);
  transition: border-color 0.15s var(--ease), box-shadow 0.15s var(--ease), transform 0.15s var(--ease);
}

.durable-item:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.durable-item .icon {
  color: var(--cobalt);
}

.durable-item small {
  display: block;
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-4);
}

/* ---------- CTA band ---------- */
.cta-band {
  position: relative;
  overflow: hidden;
  background: var(--navy);
  border-radius: var(--r-xl);
  padding: 56px 48px;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(600px 300px at 88% 0%, rgba(30, 91, 214, 0.45), transparent 60%),
    radial-gradient(400px 260px at 4% 100%, rgba(14, 148, 176, 0.28), transparent 60%);
  pointer-events: none;
}

.cta-band > * {
  position: relative;
}

.cta-band h2 {
  font-size: var(--fs-2xl);
  letter-spacing: -0.015em;
}

.cta-band p {
  margin-top: 8px;
  color: #b9cbe8;
  font-size: var(--fs-md);
}

/* ---------- Architecture ---------- */
.arch-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 32px;
  align-items: start;
}

.arch-stack {
  display: flex;
  flex-direction: column;
}

.arch-node {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--bg-elev);
  text-align: left;
  transition: border-color 0.15s var(--ease), background 0.15s var(--ease), transform 0.15s var(--ease);
  font-family: var(--font-ui);
}

.arch-node:hover {
  border-color: var(--cobalt);
  background: var(--cobalt-soft);
  transform: translateX(3px);
}

.arch-node[aria-pressed="true"] {
  border-color: var(--cobalt);
  background: var(--cobalt-soft);
  box-shadow: 0 0 0 3px var(--cobalt-soft);
}

.arch-node-num {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--ink-4);
  width: 22px;
  flex-shrink: 0;
}

.arch-node-name {
  font-weight: 700;
  color: var(--ink);
  font-size: var(--fs-md);
}

.arch-node-en {
  margin-left: auto;
  font-size: var(--fs-xs);
  color: var(--ink-4);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 600;
}

.arch-connector {
  width: 2px;
  height: 14px;
  margin-left: 27px;
  background: var(--line-strong);
}

.arch-panel {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--bg-elev);
  padding: 26px;
  box-shadow: var(--shadow-sm);
  min-height: 320px;
}

.arch-panel-kicker {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cobalt);
}

.arch-panel h3 {
  margin-top: 8px;
  font-size: var(--fs-xl);
}

.arch-panel p {
  margin-top: 12px;
  color: var(--ink-2);
  font-size: var(--fs-md);
}

.arch-panel .mono {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--ink-3);
}

/* system boundary */
.boundary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--bg-elev);
}

.boundary-cell {
  padding: 26px;
  border-left: 1px solid var(--line);
}

.boundary-cell:first-child {
  border-left: none;
}

.boundary-cell .who {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.boundary-cell .can {
  margin-top: 8px;
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--ink);
}

.boundary-cell .can em {
  font-style: normal;
  color: var(--cobalt);
}

.boundary-cell p {
  margin-top: 8px;
  font-size: var(--fs-sm);
  color: var(--ink-3);
}

/* ---------- Demo ---------- */
.demo-banner {
  border-radius: var(--r-md);
  border: 1px dashed var(--teal);
  background: var(--teal-soft);
  padding: 12px 18px;
  font-size: var(--fs-sm);
  color: var(--teal-deep);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
}

.demo-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.demo-pane {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--bg-elev);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.demo-pane-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 13px 18px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
}

.demo-pane-title {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  display: flex;
  align-items: center;
  gap: 8px;
}

.demo-pane-body {
  padding: 18px;
}

.doc-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 13px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--bg-elev);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--ink-2);
  margin-bottom: 8px;
}

.doc-chip .icon {
  color: var(--cobalt);
}

.doc-passage {
  font-size: var(--fs-sm);
  color: var(--ink-3);
  padding: 10px 13px;
  border-left: 2px solid var(--line-strong);
  margin: 4px 0 10px 20px;
  line-height: 1.65;
}

/* pipeline step buttons */
.pipeline-step {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--bg-elev);
  text-align: left;
  margin-bottom: 8px;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.pipeline-step .step-num {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1.5px solid var(--line-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--ink-3);
  flex-shrink: 0;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.pipeline-step .step-title {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--ink);
}

.pipeline-step .step-status {
  margin-left: auto;
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--ink-4);
  letter-spacing: 0.06em;
}

.pipeline-step.is-active {
  border-color: var(--cobalt);
  background: var(--cobalt-soft);
}

.pipeline-step.is-active .step-num {
  background: var(--cobalt);
  border-color: var(--cobalt);
  color: #fff;
}

.pipeline-step.is-done {
  border-color: var(--line);
}

.pipeline-step.is-done .step-num {
  background: var(--teal);
  border-color: var(--teal);
  color: #fff;
}

.pipeline-step.is-done .step-status {
  color: var(--teal-deep);
}

/* result banner */
.result-banner {
  border-radius: var(--r-md);
  padding: 20px;
  text-align: center;
  border: 1px solid;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}

.result-banner .state {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.result-banner .reason {
  margin-top: 6px;
  font-size: var(--fs-sm);
  font-weight: 600;
}

.result-banner--true { background: var(--true-soft); border-color: color-mix(in srgb, var(--true) 35%, var(--line)); color: var(--true); }
.result-banner--false { background: var(--false-soft); border-color: color-mix(in srgb, var(--false) 35%, var(--line)); color: var(--false); }
.result-banner--unknown { background: var(--unknown-soft); border-color: color-mix(in srgb, var(--unknown) 35%, var(--line)); color: var(--unknown); }
.result-banner--na { background: var(--na-soft); border-color: var(--na); color: var(--na); }
.result-banner--idle { background: var(--bg-soft); border-color: var(--line); color: var(--ink-3); }

/* condition eval list */
.cond-list {
  display: grid;
  gap: 6px;
}

.cond-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  padding: 7px 11px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--ink-2);
}

.cond-row .mark {
  width: 18px;
  text-align: center;
  font-weight: 700;
  flex-shrink: 0;
}

.cond-row.is-pass { border-color: color-mix(in srgb, var(--true) 35%, var(--line)); background: var(--true-soft); color: var(--true); }
.cond-row.is-fail { border-color: color-mix(in srgb, var(--false) 35%, var(--line)); background: var(--false-soft); color: var(--false); }
.cond-row.is-unknown { border-color: color-mix(in srgb, var(--unknown) 35%, var(--line)); background: var(--unknown-soft); color: var(--unknown); }

/* ---------- Evidence ---------- */
.evidence-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: 24px;
  align-items: start;
}

.chain {
  display: flex;
  flex-direction: column;
}

.chain-node {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--bg-elev);
  font-size: var(--fs-sm);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.chain-node.is-lit {
  border-color: var(--teal);
  background: var(--teal-soft);
}

.chain-node .chain-label {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-4);
  min-width: 64px;
}

.chain-node .chain-val {
  font-weight: 600;
  color: var(--ink);
}

.chain-node .chain-val.mono {
  font-family: var(--font-mono);
  color: var(--navy-2);
}

.chain-link {
  width: 2px;
  height: 16px;
  margin-left: 33px;
  background: var(--line-strong);
}

.chain-link.is-lit {
  background: var(--teal);
}

.src-doc {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--bg-elev);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.src-doc-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
  font-weight: 700;
  font-size: var(--fs-sm);
}

.src-doc-body {
  padding: 20px;
  font-size: var(--fs-sm);
  line-height: 1.9;
  color: var(--ink-2);
}

.src-doc-body .hl {
  background: var(--unknown-soft);
  color: var(--ink);
  font-weight: 600;
  padding: 1px 3px;
  border-radius: 4px;
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--unknown) 35%, transparent);
  transition: background 0.25s var(--ease);
}

.src-doc-body .hl.is-flash {
  animation: hl-flash 1.4s var(--ease);
}

@keyframes hl-flash {
  0% { background: var(--cyan-soft); box-shadow: 0 0 0 2px var(--cyan); }
  100% { background: var(--unknown-soft); }
}

.evidence-list {
  display: grid;
  gap: 10px;
}

.evidence-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 12px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--bg-elev);
  text-align: left;
  font-size: var(--fs-sm);
  transition: border-color 0.15s var(--ease), background 0.15s var(--ease);
}

.evidence-item:hover {
  border-color: var(--teal);
}

.evidence-item[aria-pressed="true"] {
  border-color: var(--teal);
  background: var(--teal-soft);
}

.evidence-item .ev-id {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--teal-deep);
  flex-shrink: 0;
}

.evidence-item .ev-desc {
  color: var(--ink-2);
}

.evidence-item .icon {
  margin-left: auto;
  color: var(--ink-4);
  flex-shrink: 0;
}

/* ---------- Evolution ---------- */
.evo-source-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.evo-source {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 17px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--bg-elev);
  text-align: left;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--ink-2);
  transition: border-color 0.15s var(--ease), background 0.15s var(--ease), transform 0.15s var(--ease);
}

.evo-source:hover {
  border-color: var(--cobalt);
  background: var(--cobalt-soft);
  transform: translateY(-2px);
}

.evo-source .icon {
  color: var(--cobalt);
}

.lifecycle {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--bg-elev);
}

.lifecycle-stage {
  position: relative;
  padding: 16px 10px;
  text-align: center;
  border-left: 1px solid var(--line);
  cursor: pointer;
  transition: background 0.15s var(--ease);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.lifecycle-stage:first-child {
  border-left: none;
}

.lifecycle-stage:hover {
  background: var(--bg-soft);
}

.lifecycle-stage[aria-pressed="true"] {
  background: var(--cobalt-soft);
}

.lifecycle-stage[aria-pressed="true"]::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 12%;
  right: 12%;
  height: 3px;
  background: var(--cobalt);
  border-radius: 3px 3px 0 0;
}

.lifecycle-stage .stage-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--line-strong);
}

.lifecycle-stage .stage-name {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink-2);
}

.lifecycle-stage.is-reached .stage-dot {
  background: var(--teal);
}

.lifecycle-stage[aria-pressed="true"] .stage-dot {
  background: var(--cobalt);
  box-shadow: 0 0 0 3px var(--cobalt-soft);
}

/* regression */
.regression-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.regression-stat {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--bg-elev);
  text-align: center;
}

.regression-stat .num {
  font-size: var(--fs-2xl);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.regression-stat .lbl {
  font-size: var(--fs-xs);
  color: var(--ink-3);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.regression-stat--ok .num { color: var(--true); }
.regression-stat--new .num { color: var(--cobalt); }
.regression-stat--lost .num { color: var(--false); }

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 12px;
  font-size: var(--fs-xs);
  color: var(--ink-3);
  font-weight: 600;
}

.chart-legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.chart-legend .sw {
  width: 10px;
  height: 10px;
  border-radius: 3px;
}

/* ---------- Workflow ---------- */
.case-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.case-card {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--bg-elev);
  overflow: hidden;
}

.case-card-head {
  padding: 18px 22px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.case-card-body {
  padding: 20px 22px;
  font-size: var(--fs-sm);
  color: var(--ink-2);
}

.case-card-body ol {
  list-style: decimal;
  padding-left: 18px;
  display: grid;
  gap: 6px;
}

/* ---------- Use cases ---------- */
.use-case {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--bg-elev);
  overflow: hidden;
  margin-bottom: 16px;
}

.use-case-head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 22px;
  cursor: pointer;
  transition: background 0.15s var(--ease);
}

.use-case-head:hover {
  background: var(--bg-soft);
}

.use-case-num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--ink-4);
  font-size: var(--fs-sm);
}

.use-case-title {
  font-weight: 700;
  color: var(--ink);
}

.use-case-head .badge {
  margin-left: auto;
}

.use-case-head .icon {
  color: var(--ink-4);
  transition: transform 0.2s var(--ease);
}

.use-case.is-open .use-case-head .icon {
  transform: rotate(45deg);
}

.use-case-body {
  border-top: 1px solid var(--line);
  padding: 22px;
  display: grid;
  gap: 14px;
}

.uc-row {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 14px;
  font-size: var(--fs-sm);
  align-items: start;
}

.uc-row dt {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-4);
  padding-top: 3px;
}

.uc-row dd {
  color: var(--ink-2);
}

/* ---------- Glossary ---------- */
.glossary-az {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 28px;
}

.glossary-az a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--bg-elev);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--ink-2);
}

.glossary-az a:hover {
  border-color: var(--cobalt);
  color: var(--cobalt-deep);
  text-decoration: none;
}

.glossary-letter {
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--cobalt);
  border-bottom: 1px solid var(--line);
  padding-bottom: 6px;
  margin: 34px 0 16px;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.term {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 18px;
  padding: 16px 0;
  border-bottom: 1px dashed var(--line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.term-name {
  font-weight: 700;
  color: var(--ink);
  font-size: var(--fs-md);
}

.term-name .en {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--cobalt);
  font-weight: 600;
  margin-top: 2px;
}

.term-def {
  color: var(--ink-2);
  font-size: var(--fs-md);
}

.term-cat {
  display: inline-block;
  margin-top: 6px;
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-4);
}

/* ---------- Docs hub ---------- */
.doc-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.doc-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--bg-elev);
  color: var(--ink);
  transition: border-color 0.15s var(--ease), box-shadow 0.15s var(--ease), transform 0.15s var(--ease);
}

.doc-card:hover {
  text-decoration: none;
  border-color: var(--cobalt);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.doc-card .doc-num {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--ink-4);
}

.doc-card .doc-name {
  font-weight: 700;
  font-size: var(--fs-lg);
}

.doc-card .doc-desc {
  font-size: var(--fs-sm);
  color: var(--ink-3);
}

.doc-section {
  scroll-margin-top: calc(var(--header-h) + 24px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--bg-elev);
  padding: 32px;
  margin-bottom: 24px;
}

.doc-section h2 {
  font-size: var(--fs-2xl);
  display: flex;
  align-items: center;
  gap: 12px;
}

.doc-section h2 .num {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--cobalt);
}

.doc-section > p {
  margin-top: 12px;
  color: var(--ink-2);
}

.doc-section h3 {
  margin-top: 24px;
  font-size: var(--fs-lg);
}

/* ---------- 404 ---------- */
.error-page {
  padding: 120px 0;
  text-align: center;
}

.error-code {
  font-family: var(--font-mono);
  font-size: clamp(4rem, 10vw, 7rem);
  font-weight: 700;
  color: var(--line-strong);
  letter-spacing: 0.04em;
  line-height: 1;
}

.error-page h1 {
  margin-top: 12px;
  font-size: var(--fs-2xl);
}

.error-page p {
  margin-top: 12px;
  color: var(--ink-2);
}

.error-links {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

/* ---------- reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }
}