:root {
  /* 只有这个页面用到的 token；其余全部来自 study-tokens.css。 */
  --code-ink: #dfdfd6;
  --code-label: #9b9ba4;
  --code-surface: #16161a;
}


* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 0%, color-mix(in srgb, var(--brand-soft) 70%, transparent), transparent 30rem),
    radial-gradient(circle at 95% 18%, color-mix(in srgb, var(--signal-soft) 54%, transparent), transparent 28rem),
    var(--page);
  font-family: var(--sans);
  line-height: 1.65;
}

button,
input {
  font: inherit;
}

/* 与 shell 页一致：移动端点按不再等待双击缩放判定。 */
button {
  touch-action: manipulation;
}

a {
  color: inherit;
}

button,
a,
input {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--signal) 78%, white);
  outline-offset: 3px;
}

.bridge-shell {
  width: min(1500px, calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0 42px;
}

.hero-panel,
.card,
.flow-panel,
.boundary-panel {
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.hero-panel {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 72px);
  border-radius: var(--radius-xl);
}

.hero-panel::before {
  position: absolute;
  top: -110px;
  right: -80px;
  width: 420px;
  height: 420px;
  border: 1px solid color-mix(in srgb, var(--brand) 22%, transparent);
  border-radius: 50%;
  content: "";
  box-shadow:
    0 0 0 38px color-mix(in srgb, var(--brand) 5%, transparent),
    0 0 0 86px color-mix(in srgb, var(--brand) 3%, transparent);
  pointer-events: none;
}

.eyebrow,
.section-label,
.node-index,
.schema-pill,
.summary-label {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}

.eyebrow::before {
  width: 28px;
  height: 1px;
  background: var(--signal);
  content: "";
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 210px;
  gap: clamp(32px, 6vw, 90px);
  align-items: center;
  margin-top: 36px;
}

.kicker {
  margin: 0 0 10px;
  color: var(--brand);
  font-weight: 750;
}

h1,
h2,
h3,
p {
  text-wrap: pretty;
}

h1 {
  max-width: 930px;
  margin: 0;
  font-size: clamp(2.45rem, 6.2vw, 5.5rem);
  font-weight: 780;
  letter-spacing: -0.058em;
  line-height: 0.98;
}

.hero-copy {
  max-width: 800px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.7vw, 1.2rem);
}

.hero-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 10px 17px;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 700;
  text-decoration: none;
  transition: transform var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}

.button:hover {
  transform: translateY(-2px);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
  transform: none;
}

.button-primary {
  color: #fff;
  background: var(--brand);
  box-shadow: 0 10px 26px color-mix(in srgb, var(--brand) 26%, transparent);
}

.button-secondary {
  border-color: var(--line-strong);
  color: var(--ink);
  background: var(--surface-strong);
}

.button-quiet {
  color: var(--muted);
  background: transparent;
}

.trust-stamp {
  position: relative;
  display: grid;
  width: 190px;
  aspect-ratio: 1;
  place-content: center;
  justify-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: color-mix(in srgb, var(--surface-strong) 78%, transparent);
  text-align: center;
}

.trust-stamp::after {
  position: absolute;
  inset: 10px;
  border: 1px dashed color-mix(in srgb, var(--brand) 55%, transparent);
  border-radius: inherit;
  content: "";
  animation: stamp-turn 18s linear infinite;
}

.stamp-mark {
  /* large-text: 36px 的装饰印章，WCAG 大字号下限是 3:1，图元色已经够。 */
  color: var(--signal);
  font-size: 2.25rem;
  line-height: 1;
}

.stamp-title {
  margin-top: 8px;
  font-weight: 800;
}

.stamp-copy {
  margin-top: 4px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.66rem;
  line-height: 1.55;
}

.protocol-rail {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 80px 1fr 80px 1fr;
  align-items: center;
  gap: 12px;
  margin: clamp(52px, 7vw, 92px) 0 0;
  padding: 0;
  list-style: none;
}

.protocol-node {
  display: grid;
  min-height: 116px;
  align-content: center;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--surface-soft) 68%, transparent);
}

.node-index {
  color: var(--signal-ink);
}

.protocol-node strong {
  margin-top: 3px;
  font-size: 1rem;
}

.protocol-node > span:last-child {
  color: var(--muted);
  font-size: 0.84rem;
}

.protocol-link {
  position: relative;
  height: 1px;
  overflow: hidden;
  background: var(--line-strong);
}

.protocol-link::after {
  position: absolute;
  inset: 0 auto 0 -24px;
  width: 24px;
  background: linear-gradient(90deg, transparent, var(--signal), transparent);
  content: "";
  animation: packet 2.8s ease-in-out infinite;
}

/*
 * 生命周期流转图。静态 SVG 写在 HTML 里，JS 只按表单侧状态切换 data-current，
 * 没有任何动画或过渡；文字替代在 .chart-note，读法与图一一对应。
 */
.flow-panel {
  margin-top: 22px;
  padding: clamp(24px, 3.4vw, 42px);
  border-radius: var(--radius-lg);
}

.section-intro {
  max-width: 900px;
  margin: 14px 0 0;
  color: var(--muted);
}

.flow-scroller {
  margin-top: 18px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
}

.flow-svg {
  display: block;
  width: 100%;
  min-width: 880px;
  height: auto;
}

.flow-stage rect {
  fill: var(--brand-soft);
  stroke: var(--brand);
  stroke-width: 1.5;
}

.flow-stage[data-current] rect {
  fill: var(--signal-soft);
  stroke: var(--signal);
  stroke-width: 3;
}

.flow-badge {
  visibility: hidden;
  fill: var(--signal-ink);
  font-size: 14px;
  font-weight: 700;
}

.flow-stage[data-current] .flow-badge {
  visibility: visible;
}

.flow-title {
  fill: var(--ink);
  font-family: var(--mono);
  font-size: 21px;
  font-weight: 700;
}

.flow-sub {
  fill: var(--muted);
  font-size: 15px;
}

.flow-arrow path,
.flow-fan path {
  fill: none;
  stroke-width: 2;
}

.flow-arrow path {
  stroke: var(--brand);
}

.flow-fan path {
  stroke: var(--line-strong);
}

.flow-arrow polygon,
.flow-fan polygon {
  stroke: none;
}

.flow-arrow polygon {
  fill: var(--brand);
}

.flow-fan polygon {
  fill: var(--line-strong);
}

.flow-exit rect {
  stroke-width: 1.5;
}

.flow-exit-complete rect {
  fill: var(--allow-soft);
  stroke: var(--allow);
}

.flow-exit-partial rect,
.flow-exit-unavailable rect {
  fill: var(--warning-soft);
  stroke: var(--warning);
}

.flow-exit-fail rect {
  fill: var(--deny-soft);
  stroke: var(--deny);
}

/* 协议常量用同色相的 -ink 步进做正文色，动作行用 --ink；颜色不单独承载状态。 */
.flow-constant {
  font-family: var(--mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.flow-action {
  fill: var(--ink);
  font-size: 14px;
}

.flow-exit-complete .flow-constant {
  fill: var(--allow-ink);
}

.flow-exit-partial .flow-constant,
.flow-exit-unavailable .flow-constant {
  fill: var(--warning-ink);
}

.flow-exit-fail .flow-constant {
  fill: var(--deny-ink);
}

.chart-note {
  max-width: 900px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
}

@media (forced-colors: active) {
  .flow-stage rect,
  .flow-exit rect,
  .flow-arrow polygon,
  .flow-fan polygon {
    stroke: CanvasText;
  }

  .flow-arrow path,
  .flow-arrow polygon,
  .flow-fan path,
  .flow-fan polygon {
    fill: CanvasText;
  }
}

.workspace-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
  gap: 22px;
  margin-top: 22px;
  align-items: start;
}

.workspace-grid > *,
.card,
.code-block,
pre {
  min-width: 0;
}

.card {
  padding: clamp(24px, 3.4vw, 42px);
  border-radius: var(--radius-lg);
}

.card-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.section-label {
  margin: 0 0 6px;
  color: var(--brand);
}

h2 {
  margin: 0;
  font-size: clamp(1.65rem, 3vw, 2.5rem);
  letter-spacing: -0.035em;
  line-height: 1.08;
}

h3 {
  margin: 0;
  font-size: 0.87rem;
  letter-spacing: 0.01em;
}

.schema-pill {
  display: inline-flex;
  min-width: 42px;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--brand);
  background: var(--brand-soft);
}

.card-intro {
  margin: 18px 0 28px;
  color: var(--muted);
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

label > span,
legend {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

input[type="text"],
input:not([type]) {
  width: 100%;
}

input:not([type="checkbox"]):not([type="file"]),
select {
  width: 100%;
  min-height: 45px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 11px;
  color: var(--ink);
  background: var(--surface-strong);
  font-family: var(--mono);
  font-size: 0.84rem;
}

input:not([type="checkbox"]):not([type="file"]):hover,
select:hover {
  border-color: var(--line-strong);
}

.wide-field {
  display: block;
  margin-top: 14px;
}

.wide-field input {
  font-family: var(--sans) !important;
}

.preset-field select {
  font-family: var(--sans);
}

.preset-boundary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.preset-boundary > div {
  min-width: 0;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: color-mix(in srgb, var(--surface-soft) 55%, transparent);
}

.preset-boundary strong {
  color: var(--brand);
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
}

.preset-boundary > div:last-child strong {
  color: var(--danger);
}

.preset-boundary ul {
  margin: 7px 0 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 0.78rem;
}

fieldset {
  min-width: 0;
  margin: 24px 0 0;
  padding: 0;
  border: 0;
}

.check-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.check-grid-small {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.check-option {
  position: relative;
}

.check-option input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  opacity: 0;
}

.check-option span {
  display: flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 6px 9px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--muted);
  background: var(--surface-soft);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 0.72rem;
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}

.check-option input:checked + span {
  border-color: color-mix(in srgb, var(--brand) 48%, var(--line));
  color: var(--brand);
  background: var(--brand-soft);
}

.check-option input:focus-visible + span {
  outline: 3px solid color-mix(in srgb, var(--signal) 78%, white);
  outline-offset: 2px;
}

.feedback {
  min-height: 1.6em;
  margin: 13px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.feedback[data-tone="success"] {
  color: var(--brand);
}

.feedback[data-tone="error"] {
  color: var(--danger);
}

.code-block {
  margin-top: 24px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--code-surface);
}

.handoff-block {
  margin-top: 18px;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--signal) 34%, var(--line));
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--surface-soft) 72%, transparent);
}

.handoff-copy {
  margin: 14px 16px 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.65;
}

.handoff-block pre {
  margin-top: 12px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--code-surface);
}

.handoff-actions {
  margin: 12px 16px 0;
}

.handoff-block .feedback {
  margin: 8px 16px 14px;
}

.handoff-block .code-heading { color: var(--muted); }

.code-heading {
  display: flex;
  justify-content: space-between;
  padding: 9px 14px;
  border-bottom: 1px solid color-mix(in srgb, var(--code-ink) 12%, transparent);
  color: var(--code-label);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
}

pre {
  max-height: 410px;
  max-width: 100%;
  margin: 0;
  overflow: auto;
  padding: 18px;
  color: var(--code-ink);
  font-family: var(--mono);
  font-size: 0.76rem;
  line-height: 1.65;
  tab-size: 2;
  white-space: pre;
}

.status-orb {
  display: grid;
  width: 48px;
  height: 48px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--brand) 55%, var(--line));
  border-radius: 50%;
  background: var(--brand-soft);
}

.status-orb span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 7px color-mix(in srgb, var(--brand) 15%, transparent);
  animation: status-pulse 2.2s ease-out infinite;
}

.result-card[data-status="partial"] .status-orb,
.result-card[data-status="unavailable"] .status-orb {
  border-color: color-mix(in srgb, var(--warning) 55%, var(--line));
  background: var(--warning-soft);
}

.result-card[data-status="partial"] .status-orb span,
.result-card[data-status="unavailable"] .status-orb span {
  background: var(--warning);
  box-shadow: 0 0 0 7px color-mix(in srgb, var(--warning) 15%, transparent);
}

.result-card[data-status="fail"] .status-orb,
.result-card[data-status="invalid"] .status-orb {
  border-color: color-mix(in srgb, var(--danger) 55%, var(--line));
  background: var(--danger-soft);
}

.result-card[data-status="fail"] .status-orb span,
.result-card[data-status="invalid"] .status-orb span {
  background: var(--danger);
  box-shadow: 0 0 0 7px color-mix(in srgb, var(--danger) 15%, transparent);
}

.import-row {
  display: grid;
  gap: 12px;
}

.request-import-row {
  margin-top: 14px;
}

.file-picker {
  display: grid;
  min-height: 82px;
  place-content: center;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--surface-soft) 62%, transparent);
  text-align: center;
}

.file-picker span {
  margin: 0 0 5px;
  color: var(--ink);
}

.file-picker input {
  max-width: 100%;
  color: var(--muted);
  font-size: 0.75rem;
}

.file-picker input::file-selector-button {
  margin-right: 10px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  background: var(--surface-strong);
  cursor: pointer;
}

.example-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
}

.text-button {
  padding: 2px 0;
  border: 0;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 0.7rem;
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 4px;
}

.text-button:hover {
  color: var(--brand);
}

.result-summary {
  overflow: hidden;
  margin-top: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.summary-main {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--line);
  background: var(--brand-soft);
}

.summary-main strong {
  color: var(--brand);
  font-family: var(--mono);
  font-size: clamp(1.25rem, 3vw, 1.8rem);
  letter-spacing: -0.04em;
}

.result-card[data-status="partial"] .summary-main,
.result-card[data-status="unavailable"] .summary-main {
  background: var(--warning-soft);
}

.result-card[data-status="partial"] .summary-main strong,
.result-card[data-status="unavailable"] .summary-main strong {
  color: var(--warning-ink);
}

.result-card[data-status="fail"] .summary-main,
.result-card[data-status="invalid"] .summary-main {
  background: var(--danger-soft);
}

.result-card[data-status="fail"] .summary-main strong,
.result-card[data-status="invalid"] .summary-main strong {
  color: var(--danger);
}

.summary-label {
  color: var(--muted);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
}

.summary-grid > div {
  min-width: 0;
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
}

.summary-grid > div:nth-child(odd) {
  border-right: 1px solid var(--line);
}

.summary-grid > div:nth-last-child(-n + 2) {
  border-bottom: 0;
}

dt {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
}

dd {
  margin: 4px 0 0;
  overflow-wrap: anywhere;
  font-family: var(--mono);
  font-size: 0.76rem;
}

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.evidence-block {
  min-width: 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--surface-soft) 52%, transparent);
}

.evidence-wide {
  grid-column: 1 / -1;
}

.evidence-block h3 {
  color: var(--muted);
  font-family: var(--mono);
  text-transform: uppercase;
}

.evidence-block ul {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.evidence-block li {
  padding: 5px 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: var(--surface-strong);
  font-family: var(--mono);
  font-size: 0.69rem;
  overflow-wrap: anywhere;
}

#findings-list {
  display: grid;
}

#findings-list li {
  display: grid;
  gap: 4px;
  border-left: 3px solid var(--brand);
}

#findings-list li[data-severity="warning"] {
  border-left-color: var(--warning);
}

#findings-list li[data-severity="error"] {
  border-left-color: var(--danger);
}

#check-results-list li {
  display: grid;
  gap: 4px;
}

#check-results-list li[data-status="PASS"] {
  border-left: 3px solid var(--brand);
}

#check-results-list li[data-status="PARTIAL"],
#check-results-list li[data-status="WARN"],
#check-results-list li[data-status="UNAVAILABLE"] {
  border-left: 3px solid var(--warning);
}

#check-results-list li[data-status="FAIL"] {
  border-left: 3px solid var(--danger);
}

#check-results-list span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
}

#findings-list span {
  color: var(--muted);
  font-family: var(--sans);
}

.privacy-list li,
.empty-item {
  color: var(--muted) !important;
}

.boundary-panel {
  display: grid;
  grid-template-columns: minmax(220px, 0.45fr) minmax(0, 1fr);
  gap: 40px;
  margin-top: 22px;
  padding: clamp(26px, 4vw, 48px);
  border-radius: var(--radius-lg);
}

.boundary-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.boundary-column {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.boundary-column h3 {
  color: var(--brand);
  font-size: 1rem;
}

.boundary-no h3 {
  color: var(--danger);
}

.boundary-column p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.boundary-footnote {
  grid-column: 2;
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
}

code {
  padding: 2px 6px;
  border-radius: 6px;
  color: var(--brand);
  background: var(--brand-soft);
  font-family: var(--mono);
}

.page-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 10px 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
}

.page-footer a {
  color: var(--brand);
  font-weight: 700;
  text-decoration: none;
}

@keyframes packet {
  0% { transform: translateX(0); opacity: 0; }
  20% { opacity: 1; }
  80% { opacity: 1; }
  100% { transform: translateX(110px); opacity: 0; }
}

@keyframes stamp-turn {
  to { transform: rotate(360deg); }
}

@keyframes status-pulse {
  0%, 100% { transform: scale(0.88); opacity: 0.8; }
  50% { transform: scale(1.08); opacity: 1; }
}

@media (max-width: 1080px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }

  .protocol-rail {
    grid-template-columns: 1fr 54px 1fr 54px 1fr;
  }

  .boundary-panel {
    grid-template-columns: 1fr;
  }

  .boundary-footnote {
    grid-column: 1;
  }
}

@media (max-width: 760px) {
  .bridge-shell {
    width: min(100% - 20px, 1500px);
    padding-top: 10px;
  }

  .hero-panel,
  .card,
  .boundary-panel {
    border-radius: 18px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
  }

  .trust-stamp {
    width: 150px;
  }

  .protocol-rail {
    grid-template-columns: 1fr;
  }

  .protocol-link {
    width: 1px;
    height: 34px;
    justify-self: center;
  }

  .protocol-link::after {
    inset: -18px 0 auto;
    width: 1px;
    height: 18px;
    background: linear-gradient(180deg, transparent, var(--signal), transparent);
    animation-name: packet-vertical;
  }

  .field-grid,
  .summary-grid,
  .evidence-grid,
  .boundary-columns,
  .preset-boundary {
    grid-template-columns: 1fr;
  }

  .summary-grid > div,
  .summary-grid > div:nth-child(odd) {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .summary-grid > div:last-child {
    border-bottom: 0;
  }

  .evidence-wide {
    grid-column: auto;
  }

  .check-grid,
  .check-grid-small {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-footer {
    flex-direction: column;
  }
}

@keyframes packet-vertical {
  0% { transform: translateY(0); opacity: 0; }
  20% { opacity: 1; }
  80% { opacity: 1; }
  100% { transform: translateY(54px); opacity: 0; }
}

@media (max-width: 430px) {
  .hero-actions,
  .button-row {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .check-grid,
  .check-grid-small {
    grid-template-columns: 1fr;
  }

  .summary-main {
    align-items: flex-start;
    flex-direction: column;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

@media (forced-colors: active) {
  .hero-panel,
  .card,
  .boundary-panel,
  .protocol-node,
  .evidence-block,
  .result-summary {
    border: 1px solid CanvasText;
  }

  .button,
  .check-option span {
    border: 1px solid ButtonText;
  }
}

/*
 * 内联图标。语义由旁边的文字标签承担，图标只加快扫读；去掉全部图标后信息量不变。
 * 用 currentColor 描边，所以颜色跟随所在容器，不引入第二套配色。
 */
.icon {
  flex: none;
  vertical-align: -0.16em;
  margin-right: 0.42em;
}

.has-icon {
  display: inline-flex;
  align-items: baseline;
}

/* 图标不参与减少动态效果的判断，它本身不动。 */
@media (forced-colors: active) {
  .icon { stroke: CanvasText; }
  [data-pass="true"] .icon, [data-pass="true"].icon { stroke: CanvasText; }
}

/* 正文出口状态与流程带文字的联动高亮（共享层不进本页，样式就地声明）。 */
.term-ref {
  font: inherit;
  padding: 0;
  border: none;
  background: none;
  color: var(--brand, #3aa2ff);
  text-decoration: underline dotted;
  cursor: pointer;
}
text.flow-constant.term-flash {
  fill: var(--brand, #3aa2ff);
  font-weight: 700;
}
text.flow-constant { transition: fill var(--dur-fast, 120ms) ease; }
@media (prefers-reduced-motion: reduce) {
  text.flow-constant { transition: none; }
}

/* 标题断行平衡：与共享层实验页一致，避免中文词组被拆到两行。 */
h1 { text-wrap: balance; letter-spacing: -0.01em; }