:root {
  --bg: #f5f7fb;
  --card: #fff;
  --text: #182235;
  --muted: #667085;
  --line: #dce3ee;
  --brand: #1261c9;
  --accent: #0a9b73;
  --warn: #b54708;
  --dark: #0b1f38
}

* {
  box-sizing: border-box
}

html {
  scroll-behavior: smooth
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8
}

a {
  color: var(--brand);
  text-decoration: none
}

a:hover {
  text-decoration: underline
}

.site-header {
  background: linear-gradient(135deg, #071a31, #123b6c);
  color: #fff
}

.head-inner {
  max-width: 1180px;
  margin: auto;
  padding: 20px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px
}

.brand {
  font-size: 20px;
  font-weight: 800;
  color: #fff
}

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

.nav a {
  color: #dcecff
}

.hero {
  max-width: 1180px;
  margin: auto;
  padding: 24px 22px 46px
}

.hero h1 {
  font-size: clamp(34px, 5vw, 62px);
  line-height: 1.16;
  margin: 0 0 14px;
  letter-spacing: -.03em
}

.hero p {
  max-width: 820px;
  color: #d7e6fb;
  font-size: 18px
}

.stats {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 20px
}

.stat {
  background: #ffffff14;
  border: 1px solid #ffffff25;
  padding: 8px 13px;
  border-radius: 999px
}

.wrap {
  max-width: 1180px;
  margin: auto;
  padding: 28px 20px
}

.notice {
  border: 1px solid #f0cc9d;
  background: #fff8ee;
  padding: 15px 18px;
  border-radius: 12px;
  color: #6d3b00;
  margin-bottom: 22px
}

.searchbox {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(245, 247, 251, .94);
  backdrop-filter: blur(10px);
  padding: 14px 0
}

.searchbox input {
  width: 100%;
  font-size: 17px;
  padding: 15px 17px;
  border: 1px solid #bdc8d8;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 4px 18px #23395d10
}

.chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 16px 0 24px
}

.chip {
  border: 1px solid #cbd5e1;
  background: #fff;
  padding: 7px 11px;
  border-radius: 999px;
  cursor: pointer;
  color: #334155
}

.chip.active {
  background: var(--dark);
  color: #fff;
  border-color: var(--dark)
}

h2 {
  font-size: 28px;
  margin: 38px 0 16px
}

h3 {
  line-height: 1.4
}

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

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 17px;
  box-shadow: 0 3px 12px #1632530a
}

.card h3 {
  margin: 0 0 4px;
  font-size: 18px
}

.reading,
.muted {
  color: var(--muted);
  font-size: 13px
}

.tag {
  display: inline-block;
  font-size: 12px;
  padding: 3px 8px;
  border-radius: 999px;
  background: #e8f2ff;
  color: #1559a6;
  margin-bottom: 9px
}

.card p {
  margin: 8px 0 0;
  color: #445064;
  font-size: 14px
}

.chart-card svg {
  width: 100%;
  height: 130px;
  background: #f9fbff;
  border-radius: 10px;
  margin-top: 10px
}

.chart-card .bias {
  font-size: 12px;
  color: #475467
}

.breadcrumbs {
  font-size: 13px;
  color: #667085;
  margin-bottom: 18px
}

.article {
  max-width: 860px
}

.article h1 {
  font-size: clamp(32px, 5vw, 50px);
  line-height: 1.18;
  margin: 0 0 7px
}

.lede {
  font-size: 20px;
  color: #344054
}

.formula {
  background: #eef6ff;
  border-left: 4px solid var(--brand);
  padding: 12px 16px;
  border-radius: 0 10px 10px 0;
  font-weight: 700
}

.article-section {
  margin-top: 30px;
  background: #fff;
  border: 1px solid var(--line);
  padding: 22px;
  border-radius: 14px
}

.example {
  background: #f8fafc;
  padding: 14px 16px;
  border-radius: 10px
}

.bigchart {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
  margin-top: 22px
}

.bigchart svg {
  width: 100%;
  height: auto;
  display: block
}

.chart-legend {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  color: #667085;
  font-size: 13px
}

.related {
  display: flex;
  gap: 8px;
  flex-wrap: wrap
}

.related a {
  background: #f1f5f9;
  border-radius: 999px;
  padding: 6px 10px
}

.source-list li {
  margin-bottom: 12px
}

.footer {
  border-top: 1px solid var(--line);
  padding: 28px 22px;
  color: #667085;
  text-align: center;
  background: #fff
}

.hide {
  display: none !important
}

@media(max-width:900px) {
  .grid {
    grid-template-columns: repeat(2, 1fr)
  }
}

@media(max-width:620px) {
  .head-inner {
    align-items: flex-start;
    flex-direction: column
  }

  .hero {
    padding-top: 18px
  }

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

  .nav {
    font-size: 14px
  }

  .wrap {
    padding-left: 15px;
    padding-right: 15px
  }

  .article-section {
    padding: 17px
  }
}

.article-section>h2:first-child {
  margin-top: 0
}

/* Compact article layout */
footer,
.footer {
  border-top: 1px solid var(--line);
  padding: 20px 22px;
  color: #667085;
  text-align: center;
  background: #fff
}

.article {
  padding-top: 18px;
  padding-bottom: 38px
}

.article .breadcrumbs {
  margin-bottom: 10px
}

.article .tag {
  margin-bottom: 6px
}

.article h1 {
  margin-bottom: 5px
}

.article .reading {
  margin-bottom: 6px
}

.article .lede {
  margin: 8px 0 14px;
  line-height: 1.65
}

.article .formula {
  margin: 12px 0 0
}

.article .article-section {
  margin-top: 16px;
  padding: 16px 18px
}

.article .article-section>h2:first-child {
  font-size: 24px;
  margin: 0 0 8px
}

.article .article-section p {
  margin: 6px 0
}

.article .article-section ul {
  margin-top: 8px;
  margin-bottom: 8px
}

.article .example {
  padding: 11px 14px;
  margin: 8px 0
}

.article .bigchart {
  margin-top: 14px;
  padding: 14px
}

.article .related {
  gap: 6px
}

.article .related a {
  padding: 5px 9px
}

.article .source-list li {
  margin-bottom: 8px
}

.adsbygoogle {
  margin: 16px 0;
  text-align: center;
}

@media(max-width:620px) {
  .article {
    padding-top: 14px;
    padding-bottom: 30px
  }

  .article .article-section {
    margin-top: 13px;
    padding: 14px
  }

  .article .article-section>h2:first-child {
    font-size: 22px;
    margin-bottom: 6px
  }

  footer,
  .footer {
    padding: 18px 15px
  }
}