:root {
  --bg: #f7f3ec;
  --bg-soft: #fffdf9;
  --ink: #263036;
  --muted: #667277;
  --line: rgba(38, 48, 54, 0.13);
  --card: rgba(255, 255, 255, 0.78);
  --card-strong: rgba(255, 255, 255, 0.94);
  --gold: #c99a51;
  --terracotta: #bd715d;
  --plum: #7d5d7d;
  --blue: #537f91;
  --sage: #7f946f;
  --shadow: 0 24px 70px rgba(75, 54, 43, 0.13);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --font-sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --font-serif: ui-serif, Georgia, "Times New Roman", "Noto Serif CJK SC", "Songti SC", serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 2%, rgba(201, 154, 81, 0.24), transparent 31rem),
    radial-gradient(circle at 94% 14%, rgba(125, 93, 125, 0.17), transparent 30rem),
    radial-gradient(circle at 65% 90%, rgba(83, 127, 145, 0.16), transparent 28rem),
    linear-gradient(180deg, #f7f3ec 0%, #f2eadf 45%, #faf7f1 100%);
  font-family: var(--font-sans);
  line-height: 1.76;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.32;
  background-image:
    linear-gradient(rgba(38, 48, 54, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(38, 48, 54, 0.035) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.72), rgba(0,0,0,0.05));
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 12px;
  background: var(--ink);
  color: #fff;
  padding: 0.75rem 1rem;
  border-radius: 999px;
}

.skip-link:focus { left: 12px; z-index: 10; }

.page-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0 64px;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(48px, 8vw, 88px);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(135deg, rgba(255,255,255,0.88), rgba(255,255,255,0.54)),
    radial-gradient(circle at 18% 20%, rgba(127,148,111,0.18), transparent 24rem),
    radial-gradient(circle at 84% 52%, rgba(189,113,93,0.22), transparent 23rem);
  box-shadow: var(--shadow);
  isolation: isolate;
}

.hero__glow {
  position: absolute;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  filter: blur(12px);
  opacity: 0.55;
  z-index: -1;
}

.hero__glow--one {
  right: -128px;
  top: -120px;
  background: rgba(125, 93, 125, 0.23);
}

.hero__glow--two {
  left: -150px;
  bottom: -160px;
  background: rgba(83, 127, 145, 0.22);
}

.kicker, .eyebrow {
  margin: 0 0 0.65rem;
  color: #8d633f;
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 850px;
  margin-bottom: 1.1rem;
  font-family: var(--font-serif);
  font-weight: 850;
  font-size: clamp(2.55rem, 7.7vw, 5.7rem);
  line-height: 0.98;
  letter-spacing: -0.045em;
}

h1 span {
  color: transparent;
  background: linear-gradient(90deg, #a86850, #c99a51, #537f91);
  -webkit-background-clip: text;
  background-clip: text;
}

.hero__subtitle {
  max-width: 810px;
  margin-bottom: 0.85rem;
  color: #3d484e;
  font-size: clamp(1.05rem, 2.1vw, 1.28rem);
}

.hero__subtitle--en {
  color: var(--muted);
  font-size: clamp(0.98rem, 1.65vw, 1.08rem);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.hero__actions a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.6rem 1rem;
  border: 1px solid rgba(38, 48, 54, 0.13);
  border-radius: 999px;
  color: var(--ink);
  background: rgba(255,255,255,0.64);
  text-decoration: none;
  font-weight: 760;
  transition: transform 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

.hero__actions a:hover,
.hero__actions a:focus-visible {
  transform: translateY(-2px);
  background: #fff;
  box-shadow: 0 12px 32px rgba(75, 54, 43, 0.12);
}

.notice, .statement-card, .section-block, .closing-card, .references {
  margin-top: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: 0 18px 44px rgba(75, 54, 43, 0.08);
  backdrop-filter: blur(18px);
}

.notice {
  padding: clamp(22px, 4vw, 32px);
  border-left: 8px solid rgba(83,127,145,0.66);
}

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

.statement-card,
.section-block,
.closing-card,
.references {
  padding: clamp(28px, 5vw, 48px);
}

.statement-card {
  background:
    linear-gradient(135deg, rgba(255,255,255,0.92), rgba(255,250,242,0.78)),
    radial-gradient(circle at 95% 0%, rgba(201,154,81,0.20), transparent 24rem);
}

h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 4vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 1.25rem;
}

h3 {
  font-size: 1.15rem;
  line-height: 1.35;
  margin-bottom: 0.7rem;
}

em { font-style: italic; }

a {
  color: #406f83;
  text-underline-offset: 0.18em;
}

.en {
  color: var(--muted);
  font-size: 0.96rem;
}

.lead {
  max-width: 890px;
  color: #47545a;
  font-size: 1.04rem;
}

.summary-grid,
.cards-three,
.careful-grid,
.resource-grid {
  display: grid;
  gap: 1rem;
}

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

.summary-grid article,
.info-card,
.element-list article,
.definition-box,
.careful-grid article,
.resource-grid article {
  position: relative;
  overflow: hidden;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.72);
}

.summary-grid article::after,
.info-card::after,
.careful-grid article::after,
.resource-grid article::after {
  content: "";
  position: absolute;
  inset: auto -48px -80px auto;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: rgba(201,154,81,0.13);
}

.section-heading {
  display: grid;
  grid-template-columns: 0.56fr 1.44fr;
  gap: 1.5rem;
  align-items: start;
  margin-bottom: 1.4rem;
}

.section-heading h2 { margin-bottom: 0; }

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

.number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-bottom: 1rem;
  border-radius: 50%;
  background: rgba(83,127,145,0.12);
  color: #406f83;
  font-weight: 850;
}

.element-list {
  display: grid;
  gap: 1rem;
  margin-top: 1.2rem;
}

.element-list article {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  background:
    linear-gradient(135deg, rgba(255,255,255,0.82), rgba(255,255,255,0.62));
}

.element-list span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 16px;
  color: #fff;
  background: linear-gradient(135deg, #537f91, #7d5d7d);
  font-weight: 850;
}

.two-column {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1rem;
  align-items: center;
}

.definition-box {
  background:
    linear-gradient(135deg, rgba(83,127,145,0.12), rgba(255,255,255,0.78));
}

.pattern-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin-top: 1rem;
}

.pattern-grid div {
  padding: 16px 18px;
  border: 1px solid rgba(83,127,145,0.18);
  border-radius: 16px;
  background: rgba(255,255,255,0.62);
  color: #3f4b50;
  font-weight: 720;
}

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

.closing-card {
  background:
    linear-gradient(135deg, rgba(38,48,54,0.92), rgba(69,72,85,0.88)),
    radial-gradient(circle at 20% 10%, rgba(201,154,81,0.28), transparent 24rem);
  color: #fffaf2;
}

.closing-card .eyebrow { color: #dfc08d; }
.closing-card .en { color: rgba(255,250,242,0.75); }

.references {
  background: rgba(255,255,255,0.68);
}

.references ol {
  margin: 0;
  padding-left: 1.25rem;
}

.references li {
  margin: 0.58rem 0;
  padding-left: 0.2rem;
}

.reference-note {
  margin-top: 1.3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.94rem;
}

.knowledgebase-article-footer {
  margin: 1.4rem 0 0;
  padding: 0.9rem 0 0;
  border-top: 1px solid var(--line);
  color: rgba(72,85,88,0.58);
  font-size: 0.76rem;
  line-height: 1.5;
  text-align: center;
}

.knowledgebase-article-footer p {
  margin: 0;
}

@media (max-width: 900px) {
  .page-shell { width: min(100% - 24px, 1120px); padding-top: 24px; }
  .hero { padding: 40px 26px; }
  .section-heading,
  .summary-grid,
  .cards-three,
  .two-column,
  .careful-grid,
  .resource-grid {
    grid-template-columns: 1fr;
  }
  .pattern-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 560px) {
  .hero__actions a { width: 100%; justify-content: center; }
  .statement-card, .section-block, .closing-card, .references, .notice { padding: 22px; }
  .pattern-grid { grid-template-columns: 1fr; }
  .element-list article { grid-template-columns: 1fr; }
  .element-list span { width: 44px; height: 44px; }
}