:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #637083;
  --surface: #ffffff;
  --canvas: #f5f7fb;
  --line: #dfe4ec;
  --primary: #2f66e8;
  --primary-dark: #204cad;
  --ok: #08783d;
  --ok-bg: #e9fff1;
  --warn: #8a5a00;
  --warn-bg: #fff4d6;
  --danger: #a63b32;
  --danger-bg: #fff0ee;
  --radius: 16px;
  --shadow: 0 12px 32px rgb(23 32 51 / 8%);
  --content-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 0;
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--canvas);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

button,
input,
textarea,
select {
  font: inherit;
}

a,
button {
  color: inherit;
}

a {
  text-underline-offset: 0.18em;
}

button {
  cursor: pointer;
}

:focus-visible {
  outline: 3px solid #7aa2ff;
  outline-offset: 3px;
  box-shadow: 0 0 0 6px #172033;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 0.75rem;
  left: 0.75rem;
  transform: translateY(-180%);
  padding: 0.6rem 0.85rem;
  color: var(--surface);
  background: var(--primary-dark);
  border-radius: 0.5rem;
  transition: transform 160ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--content-width);
  min-height: 4.25rem;
  margin: 0 auto;
  padding: 0.65rem clamp(1.25rem, 4vw, 2.5rem);
  background: rgb(245 247 251 / 88%);
  border-bottom: 1px solid rgb(223 228 236 / 82%);
  backdrop-filter: blur(12px);
}

.brand {
  color: var(--ink);
  font-weight: 800;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.offline-badge,
.safety-line {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.28rem 0.65rem;
  color: var(--ok);
  background: var(--ok-bg);
  border: 1px solid #bce4d0;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 700;
}

.offline-badge {
  flex: 0 0 auto;
}

.offline-badge::before,
.safety-line::before {
  content: "●";
  font-size: 0.72em;
}

main,
footer {
  width: min(100% - 2.5rem, var(--content-width));
  margin: 0 auto;
}

main {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  padding: clamp(1.25rem, 3vw, 2rem) 0 3rem;
}

main > section {
  min-width: 0;
  padding: clamp(1.35rem, 4vw, 2.6rem);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

section[id] {
  scroll-margin-top: 88px;
}

.hero {
  color: var(--surface);
  background: var(--ink);
  border-color: var(--ink);
  box-shadow: 0 18px 40px rgb(23 32 51 / 18%);
}

.eyebrow,
.section-index {
  margin: 0 0 0.35rem;
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #a9c4ff;
}

h1,
h2,
h3,
p {
  overflow-wrap: break-word;
}

h1,
h2,
h3 {
  margin-top: 0;
  color: var(--ink);
  font-weight: 800;
  line-height: 1.18;
}

h1 {
  margin-bottom: 0.8rem;
  color: var(--surface);
  font-size: clamp(2.25rem, 7vw, 4.75rem);
  letter-spacing: -0.055em;
}

h2 {
  margin-bottom: 0.8rem;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  letter-spacing: -0.035em;
}

h3 {
  margin-bottom: 0.55rem;
  font-size: 1.05rem;
}

p {
  margin: 0 0 1rem;
}

.hero-copy {
  max-width: 42rem;
  color: #dbe4f7;
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
}

.metric-grid,
.boundary-grid,
.profile-grid,
.tool-grid {
  display: grid;
  gap: 1rem;
}

.metric-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 1.5rem 0 0.9rem;
}

.metric-grid article {
  display: grid;
  gap: 0.4rem;
  padding: 1.1rem;
  color: #eef3ff;
  background: #25314a;
  border: 1px solid #33415d;
  border-radius: calc(var(--radius) - 4px);
}

.metric-grid strong {
  color: var(--surface);
  font-size: clamp(1.35rem, 3vw, 1.8rem);
  line-height: 1.15;
}

.metric-grid span,
.fine-print {
  color: var(--muted);
  font-size: 0.9rem;
}

.metric-grid span {
  color: #dbe4f7;
}

.fine-print {
  max-width: 56rem;
  margin-bottom: 1.25rem;
}

.hero .fine-print {
  color: #aebbd2;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.7rem;
  padding: 0.62rem 1rem;
  border: 1px solid transparent;
  border-radius: 0.6rem;
  font-weight: 750;
  line-height: 1.2;
  text-decoration: none;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.primary {
  color: var(--surface);
  background: var(--primary);
  border-color: var(--primary);
}

.primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
}

.primary:focus-visible,
.hero .button:focus-visible {
  outline-color: #ffffff;
  box-shadow: 0 0 0 3px #172033, 0 0 0 6px #ffffff;
}

.secondary {
  color: var(--primary-dark);
  background: var(--surface);
  border-color: #b8c9ef;
}

.secondary:hover {
  background: #edf3ff;
  border-color: var(--primary);
}

.demo-layout {
  display: grid;
  grid-template-columns: minmax(15rem, 0.7fr) minmax(0, 1.3fr);
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.scenario-panel,
.result-panel {
  min-width: 0;
  padding: 1.15rem;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) - 2px);
}

.scenario-panel {
  display: grid;
  align-content: start;
  gap: 0.65rem;
  margin: 0;
  background: #f8faff;
}

.scenario-panel legend {
  padding: 0 0.3rem;
  color: var(--ink);
  font-weight: 800;
}

.scenario {
  width: 100%;
  padding: 0.75rem 0.8rem;
  color: var(--ink);
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.6rem;
  transition: border-color 160ms ease, background-color 160ms ease, box-shadow 160ms ease;
}

.scenario:hover,
.scenario.is-selected {
  border-color: var(--primary);
}

.scenario.is-selected {
  color: var(--primary-dark);
  background: #edf3ff;
  box-shadow: inset 0 0 0 1px var(--primary);
}

.scenario.is-selected::before {
  content: "已选 · ";
  font-weight: 800;
}

.scenario-panel .button {
  width: 100%;
  margin-top: 0.25rem;
}

.result-panel {
  background: var(--surface);
}

.input-summary {
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}

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

.step-list {
  display: grid;
  gap: 0.55rem;
  margin-bottom: 1rem;
}

.step-list li {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  min-width: 0;
  padding: 0.55rem 0.7rem;
  border-left: 3px solid var(--line);
  border-radius: 0 0.5rem 0.5rem 0;
  color: var(--muted);
}

.step-list li::before {
  flex: 0 0 auto;
  font-weight: 800;
}

.step-name {
  flex: 1 1 auto;
}

.step-status {
  flex: 0 0 auto;
  padding: 0.08rem 0.45rem;
  border: 1px solid currentcolor;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 750;
  line-height: 1.3;
}

.step-list li[data-status="pending"] {
  color: var(--muted);
  background: #f8faff;
  border-left-color: var(--line);
}

.step-list li[data-status="pending"]::before {
  content: "○";
}

.step-list li[data-status="running"] {
  color: var(--primary-dark);
  background: #edf3ff;
  border-left-color: var(--primary);
}

.step-list li[data-status="running"]::before {
  content: "→";
}

.step-list li[data-status="complete"] {
  color: var(--ok);
  background: var(--ok-bg);
  border-left-color: var(--ok);
}

.step-list li[data-status="complete"]::before {
  content: "✓";
}

.report {
  min-height: 11rem;
  padding: 1rem;
  background: #f8faff;
  border: 1px solid #d6e1f6;
  border-radius: 0.65rem;
}

.report[aria-busy="true"] {
  border-color: #9fbaf2;
}

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

.notice {
  padding: 0.8rem 1rem;
  color: var(--warn);
  background: var(--warn-bg);
  border-left: 4px solid var(--warn);
}

.workflow {
  display: grid;
  grid-template-columns: repeat(7, minmax(8.5rem, 1fr));
  gap: 0.75rem;
  margin-top: 1.25rem;
  overflow-x: auto;
  padding: 0.25rem 0 0.75rem;
  scrollbar-color: #b8c9ef transparent;
}

.workflow li {
  position: relative;
  min-width: 8.5rem;
  padding: 0.8rem 0.75rem;
  color: var(--primary-dark);
  font-weight: 750;
  text-align: center;
  background: #edf3ff;
  border: 1px solid #cbdaf5;
  border-radius: 0.65rem;
}

.workflow li:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -0.6rem;
  z-index: 1;
  color: var(--primary);
  content: "→";
  transform: translateY(-50%);
}

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

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

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

.boundary-grid article,
.profile-grid article,
.tool-grid article,
.evidence-card {
  min-width: 0;
  padding: 1.1rem;
  background: #fbfcff;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) - 4px);
}

.boundary-grid article:first-child h3 {
  color: var(--ok);
}

.boundary-grid article:last-child h3 {
  color: var(--danger);
}

.boundary-grid ul {
  margin: 0;
  padding-left: 1.25rem;
}

.boundary-grid li + li {
  margin-top: 0.45rem;
}

.profile-grid p,
.tool-grid p,
.evidence-card p:last-child {
  margin-bottom: 0;
}

.evidence-card {
  border-left: 4px solid var(--primary);
}

.evidence-card img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
}

footer {
  padding: 0 0 2.5rem;
  color: var(--muted);
  font-size: 0.92rem;
}

footer p {
  margin: 0.25rem 0;
}

footer strong {
  color: var(--ink);
}

@media (max-width: 760px) {
  .site-header {
    min-height: 3.75rem;
    padding: 0.55rem 1.25rem;
  }

  main,
  footer {
    width: min(100% - 1.5rem, var(--content-width));
  }

  main {
    gap: 1rem;
    padding-top: 1rem;
  }

  main > section {
    padding: 1.25rem;
  }

  .metric-grid,
  .demo-layout,
  .boundary-grid,
  .profile-grid,
  .tool-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .metric-grid {
    gap: 0.75rem;
  }

  .workflow {
    grid-template-columns: 1fr;
    overflow-x: hidden;
  }

  .workflow li {
    min-width: 0;
  }

  .workflow li:not(:last-child)::after {
    top: auto;
    right: 50%;
    bottom: -0.9rem;
    transform: translateX(50%) rotate(90deg);
  }
}

@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;
  }
}