:root {
  color-scheme: light;
  --bg: #ecebe8;
  --surface: #ffffff;
  --surface-soft: #f7f6f3;
  --surface-muted: #f1efea;
  --ink: #111111;
  --muted: #666666;
  --line: rgba(17, 17, 17, 0.08);
  --shadow-xl: 0 34px 100px rgba(20, 20, 20, 0.08);
  --shadow-lg: 0 22px 54px rgba(20, 20, 20, 0.06);
  --radius-xl: 34px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 14px;
  --container: 1160px;
  --font-display: "Manrope", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.72), transparent 24%),
    linear-gradient(180deg, #efeeeb 0%, #e7e5e1 100%);
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

.case-header,
.case-main,
.case-footer {
  width: min(calc(100% - 36px), var(--container));
  margin: 0 auto;
}

.case-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 26px 0 18px;
}

.case-back {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  box-shadow: 0 12px 24px rgba(20, 20, 20, 0.05);
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 700;
}

.case-back svg {
  width: 18px;
  height: 18px;
}

.case-header-note,
.eyebrow,
.case-meta span,
.case-summary-card span,
.process-node span,
.step-index,
.architecture-col span {
  color: var(--muted);
}

.case-header-note,
.eyebrow,
.step-index,
.architecture-col span {
  font-family: var(--font-display);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.case-header-note {
  margin: 0;
}

.case-hero,
.case-block {
  margin-bottom: 18px;
  padding: 30px;
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: var(--shadow-xl);
  content-visibility: auto;
  contain-intrinsic-size: 760px;
}

.case-title,
.case-block-heading h2,
.reflection-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.06em;
}

.case-title {
  max-width: 12ch;
  font-size: clamp(2.8rem, 6vw, 5.2rem);
  line-height: 1.04;
}

.case-lead,
.case-block-copy,
.case-summary-card strong,
.info-card p,
.tension-card p,
.process-node p,
.step-card-copy p,
.result-card p,
.reflection-card p,
.case-footer p {
  color: var(--muted);
  line-height: 1.9;
}

.case-lead {
  max-width: 66ch;
  margin: 20px 0 0;
  font-size: 1.02rem;
}

.case-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.case-meta span {
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--surface-soft);
  border: 1px solid var(--line);
  font-family: var(--font-display);
  font-size: 0.84rem;
}

.case-overview-grid,
.three-card-grid,
.result-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.case-overview-grid {
  margin-top: 28px;
}

.case-summary-card,
.info-card,
.tension-card,
.result-card,
.reflection-card,
.process-node,
.architecture-col {
  padding: 22px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lg);
}

.case-summary-card strong {
  display: block;
  font-size: 1rem;
}

.case-hero-visual {
  margin: 28px 0 0;
  padding: 16px;
  border-radius: var(--radius-lg);
  background: var(--surface-soft);
  border: 1px solid var(--line);
}

.case-hero-visual img {
  width: 100%;
  border-radius: 18px;
  box-shadow: 0 18px 34px rgba(17, 17, 17, 0.08);
}

.case-hero-visual figcaption {
  margin-top: 12px;
  color: var(--muted);
  line-height: 1.7;
}

.case-block-heading {
  max-width: 860px;
  margin-bottom: 24px;
}

.case-block-heading h2 {
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.08;
}

.case-block-copy {
  max-width: 62ch;
  margin: 16px 0 0;
}

.info-card h3,
.tension-card h3,
.step-card-copy h3,
.result-card strong {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.28rem;
  letter-spacing: -0.04em;
  line-height: 1.24;
}

.process-strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 28px minmax(0, 1fr) 28px minmax(0, 1fr) 28px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  margin-bottom: 24px;
}

.process-node span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-bottom: 12px;
  border-radius: 50%;
  background: rgba(17, 17, 17, 0.06);
}

.process-node strong {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-display);
  font-size: 1rem;
}

.process-arrow,
.architecture-link {
  position: relative;
  height: 2px;
  background: rgba(17, 17, 17, 0.12);
}

.process-arrow::after,
.architecture-link::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 0;
  width: 9px;
  height: 9px;
  border-top: 2px solid rgba(17, 17, 17, 0.32);
  border-right: 2px solid rgba(17, 17, 17, 0.32);
  transform: translateY(-50%) rotate(45deg);
}

.case-step-grid {
  display: grid;
  gap: 18px;
}

.step-card {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(300px, 1.12fr);
  gap: 20px;
  align-items: center;
  padding: 18px;
  border-radius: var(--radius-lg);
  background: var(--surface-soft);
  border: 1px solid var(--line);
}

.step-card-reverse {
  grid-template-columns: minmax(300px, 1.12fr) minmax(0, 0.88fr);
}

.step-card-reverse .step-card-copy {
  order: 2;
}

.step-card-reverse .step-card-figure {
  order: 1;
}

.step-card-copy {
  padding: 12px 8px;
}

.step-card-copy ul {
  display: grid;
  gap: 10px;
  margin: 16px 0 0;
  padding-left: 1.15rem;
  color: var(--muted);
  line-height: 1.8;
}

.step-card-figure,
.step-card-figure-stack {
  display: grid;
  gap: 14px;
}

.step-card-figure img,
.step-card-figure-stack img {
  width: 100%;
  border-radius: 18px;
  border: 1px solid var(--line);
  box-shadow: 0 16px 30px rgba(17, 17, 17, 0.08);
}

.architecture-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 36px minmax(0, 1fr) 36px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  margin-bottom: 22px;
}

.architecture-col strong {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-display);
  font-size: 1.08rem;
  letter-spacing: -0.03em;
}

.architecture-col p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.reflection-card {
  margin-top: 18px;
}

.reflection-card h3 {
  font-size: 1.6rem;
  margin-bottom: 10px;
}

.case-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  padding: 18px 0 20px;
}

.case-section {
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: var(--shadow-lg);
}

.case-section h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: -0.04em;
}

.case-section p {
  margin: 0;
  color: var(--muted);
  line-height: 1.85;
}

.case-footer {
  padding: 8px 0 44px;
}

.case-footer p {
  max-width: 70ch;
  margin: 0;
}

@media (max-width: 980px) {
  .case-overview-grid,
  .three-card-grid,
  .result-grid,
  .case-columns,
  .step-card,
  .step-card-reverse {
    grid-template-columns: 1fr;
  }

  .step-card-reverse .step-card-copy,
  .step-card-reverse .step-card-figure {
    order: initial;
  }

  .process-strip,
  .architecture-panel {
    grid-template-columns: 1fr;
  }

  .process-arrow,
  .architecture-link {
    width: 2px;
    height: 28px;
    margin: 0 auto;
  }

  .process-arrow::after,
  .architecture-link::after {
    top: auto;
    bottom: 0;
    left: 50%;
    right: auto;
    transform: translateX(-50%) rotate(135deg);
  }
}

@media (max-width: 1366px) {
  :root {
    --container: 1080px;
  }

  .case-hero,
  .case-block {
    padding: 24px;
    border-radius: 28px;
  }

  .case-title {
    font-size: clamp(2.5rem, 5vw, 4.4rem);
  }
}

@media (max-width: 720px) {
  .case-header,
  .case-main,
  .case-footer {
    width: min(calc(100% - 20px), var(--container));
  }

  .case-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .case-hero,
  .case-block {
    padding: 18px;
  }

  .case-title {
    font-size: clamp(2.2rem, 12vw, 3.6rem);
  }

  .case-back {
    min-height: 44px;
    padding: 0 14px;
    border-radius: 14px;
  }
}