:root {
  --bg: #f7fbff;
  --panel: #ffffff;
  --ink: #102033;
  --muted: #4c6378;
  --line: #dce9f3;
  --brand: #155f7a;
  --brand-dark: #0f465a;
  --soft: #eaf6fb;
  --mint: #edf8f2;
  --warning: #fff7e8;
  --shadow: 0 18px 46px rgba(16, 32, 51, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(21, 95, 122, 0.12), transparent 34rem),
    linear-gradient(180deg, #fbfdff 0%, var(--bg) 100%);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  line-height: 1.65;
}

a {
  color: var(--brand-dark);
}

a:hover {
  text-decoration-thickness: 2px;
}

.page-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 72px;
}

.hero,
.content-card,
.sample-card,
.split-card,
.judgment-model,
.source-note {
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.hero {
  padding: clamp(34px, 6vw, 72px);
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--brand-dark);
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.82rem;
}

h1,
h2,
h3 {
  line-height: 1.15;
  margin-top: 0;
}

h1 {
  max-width: 880px;
  margin-bottom: 18px;
  font-size: clamp(2.35rem, 7vw, 5rem);
  letter-spacing: -0.055em;
}

h2 {
  font-size: clamp(1.55rem, 3vw, 2.25rem);
  letter-spacing: -0.035em;
}

h3 {
  font-size: 1.08rem;
}

.hero-copy {
  max-width: 790px;
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.3rem);
  margin-bottom: 28px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 18px;
  border-radius: 999px;
  font-weight: 850;
  text-decoration: none;
  border: 1px solid transparent;
}

.button.primary {
  background: var(--brand);
  color: #ffffff;
}

.button.primary:hover {
  background: var(--brand-dark);
}

.button.secondary {
  background: #ffffff;
  color: var(--brand-dark);
  border-color: var(--line);
}

.content-card,
.sample-card,
.split-card,
.judgment-model,
.source-note {
  padding: clamp(24px, 4vw, 40px);
  margin: 18px 0;
}

.content-card p,
.sample-card p,
.split-card p,
.judgment-model p,
.source-note p,
li {
  color: var(--muted);
}

.cycle-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.cycle-grid article {
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 18px;
}

.cycle-grid span {
  display: inline-flex;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: #ffffff;
  color: var(--brand-dark);
  font-weight: 900;
  margin-bottom: 12px;
}

.cycle-grid article p {
  margin-bottom: 0;
}

.sample-card {
  background:
    linear-gradient(135deg, rgba(237, 248, 242, 0.94), rgba(255, 255, 255, 0.96));
}

.case-label {
  display: inline-flex;
  margin: 0 0 10px;
  padding: 5px 10px;
  border-radius: 999px;
  background: #ffffff;
  color: var(--brand-dark);
  font-weight: 850;
}

.answer-list,
.clean-list,
.step-list {
  padding-left: 1.25rem;
}

.answer-list li,
.clean-list li,
.step-list li {
  margin: 0.55rem 0;
}

.rationale {
  margin-top: 22px;
  padding: 20px;
  border-radius: 20px;
  background: #ffffff;
  border: 1px solid var(--line);
}

.split-card {
  display: grid;
  grid-template-columns: 1.4fr 0.9fr;
  gap: 24px;
  align-items: start;
}

.warning-box {
  background: var(--warning);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 22px;
}

.warning-box p {
  margin-bottom: 0;
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.link-grid a {
  display: block;
  min-height: 150px;
  padding: 18px;
  border-radius: 20px;
  background: var(--soft);
  border: 1px solid var(--line);
  text-decoration: none;
}

.link-grid strong,
.link-grid span {
  display: block;
}

.link-grid strong {
  color: var(--ink);
  margin-bottom: 8px;
}

.link-grid span {
  color: var(--muted);
}

.faq details {
  border-top: 1px solid var(--line);
  padding: 16px 0;
}

.faq details:first-of-type {
  border-top: 0;
}

.faq summary {
  cursor: pointer;
  font-weight: 850;
  color: var(--ink);
}

.source-note {
  font-size: 0.95rem;
}

.source-note ul {
  padding-left: 1.2rem;
}

@media (max-width: 1040px) {
  .link-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 920px) {
  .cycle-grid,
  .split-card {
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 22px, 1120px);
    padding-top: 22px;
  }

  .hero,
  .content-card,
  .sample-card,
  .split-card,
  .judgment-model,
  .source-note {
    border-radius: 22px;
  }

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