:root {
  color-scheme: light;
  --bg: #f7f9fb;
  --paper: #ffffff;
  --ink: #10202f;
  --muted: #5c6b78;
  --subtle: #dce4ea;
  --line: #c9d5df;
  --blue: #176b9a;
  --blue-dark: #0f4a68;
  --amber: #c88614;
  --green: #1f8f65;
  --red: #b63b32;
  --cyan: #147d8a;
  --shadow: 0 20px 50px rgba(25, 47, 65, 0.11);
  --radius: 8px;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
}

img {
  display: block;
  width: 100%;
  height: auto;
}

a {
  color: inherit;
}

code {
  padding: 0.08rem 0.32rem;
  border: 1px solid #d8e1e8;
  border-radius: 4px;
  background: #f2f6f9;
  color: #14394d;
  font-size: 0.92em;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
  padding: 12px clamp(18px, 4vw, 56px);
  border-bottom: 1px solid rgba(16, 32, 47, 0.12);
  background: rgba(247, 249, 251, 0.94);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  border: 1px solid #b7ccd8;
  border-radius: 8px;
  background: #eaf3f7;
  color: var(--blue-dark);
}

.brand-mark svg {
  width: 23px;
  height: 23px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 0.96rem;
  line-height: 1.2;
  letter-spacing: 0;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.78rem;
}

.nav {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.nav a {
  min-height: 36px;
  padding: 8px 12px;
  border-radius: 6px;
  color: #31495a;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 650;
}

.nav a:hover,
.nav a.active {
  background: #e5f0f6;
  color: var(--blue-dark);
}

.language-switch {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 0 0 auto;
  padding: 3px;
  border: 1px solid #d3dee6;
  border-radius: 7px;
  background: #fff;
}

.language-switch a {
  min-height: 30px;
  padding: 6px 9px;
  border-radius: 5px;
  color: #31495a;
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 800;
  line-height: 1.2;
}

.language-switch a:hover,
.language-switch a.active {
  background: var(--blue);
  color: #fff;
}

main {
  width: min(1440px, 100%);
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(340px, 0.8fr);
  gap: clamp(24px, 4vw, 48px);
  padding: clamp(40px, 7vw, 88px) clamp(18px, 4vw, 56px) 24px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 820px;
  margin-bottom: 20px;
  font-size: clamp(2.15rem, 4vw, 4.8rem);
  line-height: 1.04;
  letter-spacing: 0;
}

.lead {
  max-width: 820px;
  margin-bottom: 28px;
  color: #405463;
  font-size: clamp(1.02rem, 1.4vw, 1.24rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid #adc7d6;
  border-radius: 7px;
  text-decoration: none;
  font-size: 0.94rem;
  font-weight: 750;
}

.button.primary {
  border-color: var(--blue);
  background: var(--blue);
  color: #fff;
}

.button.secondary {
  background: #fff;
  color: var(--blue-dark);
}

.conclusion-panel {
  align-self: start;
  padding: 24px;
  border: 1px solid #d2dde5;
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.conclusion-panel h2 {
  margin-bottom: 16px;
  font-size: 1.25rem;
}

.hero-evidence {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-column: 1 / -1;
  gap: 14px;
}

.hero-evidence figure {
  overflow: hidden;
  border: 1px solid #d3dee6;
  border-radius: var(--radius);
  background: #fff;
}

.hero-evidence img {
  aspect-ratio: 1 / 1;
  height: auto;
  object-fit: contain;
  background: #061018;
}

.hero-evidence figcaption {
  color: #2f4555;
}

.finding-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.finding-list li {
  display: grid;
  grid-template-columns: 10px 1fr;
  gap: 10px;
  color: #354957;
  font-size: 0.95rem;
}

.finding-list strong {
  color: var(--ink);
}

.status {
  width: 10px;
  height: 10px;
  margin-top: 8px;
  border-radius: 50%;
}

.status.good {
  background: var(--green);
}

.status.bad {
  background: var(--red);
}

.status.warn {
  background: var(--amber);
}

.status.info {
  background: var(--cyan);
}

.summary-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 8px clamp(18px, 4vw, 56px) 0;
  overflow: hidden;
  border: 1px solid #d3dee6;
  border-radius: var(--radius);
  background: #d3dee6;
}

.summary-strip article {
  padding: 18px;
  background: #fff;
}

.summary-strip span,
.summary-strip small {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.summary-strip strong {
  display: block;
  margin: 5px 0 4px;
  font-size: 1.02rem;
}

.section {
  padding: clamp(48px, 7vw, 92px) clamp(18px, 4vw, 56px);
}

.section-heading {
  max-width: 880px;
  margin-bottom: 28px;
}

.section-heading h2 {
  margin-bottom: 10px;
  font-size: clamp(1.7rem, 2.8vw, 2.8rem);
  line-height: 1.12;
  letter-spacing: 0;
}

.section-heading p {
  color: var(--muted);
  font-size: 1rem;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.method-card,
.risk-card,
.metric-card,
.paper-grid article,
.limitation-grid article,
.next-grid article,
.case-card {
  border: 1px solid #d3dee6;
  border-radius: var(--radius);
  background: var(--paper);
}

.method-card {
  padding: 20px;
}

.step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 28px;
  margin-bottom: 16px;
  border: 1px solid #bdd2dc;
  border-radius: 6px;
  color: var(--blue-dark);
  font-size: 0.75rem;
  font-weight: 800;
}

.method-card h3,
.risk-card h3,
.metric-card h3,
.paper-grid h3,
.limitation-grid h3,
.next-grid h3,
.case-card h3 {
  margin-bottom: 8px;
  font-size: 1.05rem;
  line-height: 1.28;
}

.method-card p,
.risk-card p,
.paper-grid p,
.limitation-grid p,
.next-grid p,
.case-card p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.flow {
  display: grid;
  grid-template-columns: 1fr 30px 1fr 30px 1fr 30px 1fr;
  align-items: center;
  gap: 10px;
  margin-top: 22px;
  padding: 18px;
  border: 1px solid #d3dee6;
  border-radius: var(--radius);
  background: #edf4f8;
}

.flow div {
  min-height: 48px;
  display: grid;
  place-items: center;
  padding: 10px;
  border: 1px solid #bfd1dc;
  border-radius: 7px;
  background: #fff;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 750;
}

.flow svg {
  width: 28px;
  height: 28px;
  fill: none;
  stroke: var(--blue-dark);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.paper-section {
  background: #fff;
}

.paper-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.paper-grid article {
  padding: 20px;
}

.paper-grid span {
  display: block;
  margin-bottom: 10px;
  color: var(--blue-dark);
  font-size: 0.76rem;
  font-weight: 800;
}

.comparison-block {
  margin-top: 22px;
}

.comparison-block h3 {
  margin-bottom: 12px;
  font-size: 1.1rem;
}

.plain-comparison {
  margin-bottom: 16px;
  padding: 18px;
  border: 1px solid #c9dce6;
  border-radius: var(--radius);
  background: #f3f8fb;
}

.plain-comparison p {
  max-width: 980px;
  margin: 0 0 14px;
  color: #435766;
  font-size: 0.95rem;
}

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

.plain-flow-grid article {
  padding: 14px;
  border: 1px solid #d3dee6;
  border-radius: 7px;
  background: #fff;
}

.plain-flow-grid strong,
.plain-flow-grid span,
.plain-flow-grid small {
  display: block;
}

.plain-flow-grid strong {
  margin-bottom: 8px;
  color: var(--ink);
  font-size: 0.92rem;
}

.plain-flow-grid span {
  margin-bottom: 8px;
  color: var(--blue-dark);
  font-size: 0.88rem;
  font-weight: 760;
}

.plain-flow-grid small {
  color: var(--muted);
  font-size: 0.82rem;
}

.comparison-table {
  overflow: hidden;
  border: 1px solid #d3dee6;
  border-radius: var(--radius);
  background: var(--paper);
}

.comparison-row {
  display: grid;
  grid-template-columns: minmax(120px, 0.7fr) repeat(2, minmax(0, 1.45fr));
  border-top: 1px solid #d3dee6;
}

.comparison-row:first-child {
  border-top: 0;
}

.comparison-row.header {
  background: #eaf3f7;
  color: var(--blue-dark);
  font-weight: 800;
}

.comparison-row div {
  padding: 14px 16px;
  border-left: 1px solid #d3dee6;
  color: var(--muted);
  font-size: 0.9rem;
}

.comparison-row div:first-child {
  border-left: 0;
  color: var(--ink);
  font-weight: 750;
}

.evidence {
  background: #fff;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.case-card {
  overflow: hidden;
}

.case-card.wide {
  grid-column: 1 / -1;
}

.case-header {
  padding: 18px 18px 0;
}

.case-header span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
}

.image-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 16px 0;
  background: #d8e2e9;
}

.image-pair.three-up {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

figure {
  margin: 0;
  background: #f3f6f8;
}

.image-pair img {
  aspect-ratio: 1 / 1;
  height: auto;
  object-fit: contain;
  background: #f3f6f8;
}

.failure .image-pair img {
  background: #050607;
}

figcaption {
  min-height: 34px;
  padding: 8px 10px;
  color: #536472;
  background: #fff;
  font-size: 0.78rem;
  font-weight: 700;
}

.image-error {
  min-height: 180px;
  display: grid;
  place-items: center;
  padding: 18px;
  background: #f2f6f9;
  color: var(--red);
  text-align: center;
  font-size: 0.9rem;
  font-weight: 750;
}

.case-card p {
  padding: 0 18px 18px;
}

.success {
  border-top: 4px solid var(--green);
}

.failure {
  border-top: 4px solid var(--red);
}

.warning {
  border-top: 4px solid var(--amber);
}

.info {
  border-top: 4px solid var(--cyan);
}

.risk-layout {
  display: grid;
  grid-template-columns: 1fr 1fr 1.1fr;
  gap: 18px;
}

.risk-card,
.metric-card {
  padding: 22px;
}

.risk-card ul {
  display: grid;
  gap: 9px;
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 0.94rem;
}

.metric-row {
  display: grid;
  grid-template-columns: minmax(92px, 0.7fr) minmax(120px, 1fr) 48px;
  gap: 10px;
  align-items: center;
  margin: 13px 0;
  font-size: 0.86rem;
}

.metric-row b {
  position: relative;
  height: 9px;
  overflow: hidden;
  border-radius: 999px;
  background: #dbe5ec;
}

.metric-row b::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--value);
  border-radius: inherit;
  background: linear-gradient(90deg, var(--blue), var(--amber));
}

.metric-row em {
  color: var(--muted);
  font-style: normal;
  font-weight: 700;
  text-align: right;
}

.next {
  padding-bottom: 48px;
}

.limitations {
  background: #fff;
}

.limitation-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.limitation-grid article {
  padding: 20px;
}

.next-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.next-grid article {
  padding: 20px;
}

.citation-box {
  margin-top: 24px;
  padding: 22px;
  border: 1px solid #bfd2dd;
  border-radius: var(--radius);
  background: #eaf3f7;
}

.citation-box h3 {
  margin-bottom: 8px;
}

.citation-box p {
  margin-bottom: 0;
  color: #334c5d;
}

.citation-box a {
  color: var(--blue-dark);
  font-weight: 750;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 26px clamp(18px, 4vw, 56px) 36px;
  border-top: 1px solid #d3dee6;
  color: var(--muted);
  font-size: 0.88rem;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: var(--blue-dark);
  font-weight: 750;
}

@media (max-width: 1100px) {
  .hero,
  .risk-layout {
    grid-template-columns: 1fr;
  }

  .method-grid,
  .paper-grid,
  .limitation-grid,
  .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

}

@media (max-width: 720px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav {
    width: 100%;
  }

  .nav a {
    flex: 1 1 auto;
    text-align: center;
  }

  .language-switch {
    width: 100%;
  }

  .language-switch a {
    flex: 1 1 0;
    text-align: center;
  }

  .hero {
    padding-top: 32px;
  }

  .summary-strip,
  .method-grid,
  .paper-grid,
  .case-grid,
  .limitation-grid,
  .next-grid,
  .hero-evidence,
  .image-pair,
  .image-pair.three-up,
  .flow {
    grid-template-columns: 1fr;
  }

  .comparison-row,
  .comparison-row.header {
    grid-template-columns: 1fr;
  }

  .comparison-row div {
    border-left: 0;
    border-top: 1px solid #d3dee6;
  }

  .comparison-row div:first-child {
    border-top: 0;
    background: #f3f6f8;
  }

  .plain-flow-grid {
    grid-template-columns: 1fr;
  }

  .flow svg {
    transform: rotate(90deg);
    justify-self: center;
  }

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