:root {
  --fog: #cfd8e4;
  --paper: #f3f6fb;
  --ink: #162033;
  --muted: #5b6678;
  --line: #b7c3d4;
  --seal: #e23b2c;
  --seal-soft: #f8d4cf;
  --teal: #0e7c7b;
  --teal-2: #3aa39a;
  --gold: #c9892c;
  --us: #2f5d9f;
  --de: #5b4db0;
  --cn: #c45c16;
  --eu: #1f6f8b;
  --shadow: 0 18px 40px rgba(22, 32, 51, 0.08);
  --register: 52px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html[lang="ja"] .en { display: none !important; }
html[lang="en"] .ja { display: none !important; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(226, 59, 44, 0.08), transparent 50%),
    linear-gradient(180deg, #d9e1ec 0%, var(--fog) 40%, #d3dce8 100%);
  font-family: "IBM Plex Sans JP", "IBM Plex Sans", sans-serif;
  font-weight: 400;
  line-height: 1.65;
  letter-spacing: 0.01em;
}
body::before {
  content: "";
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--register);
  background: repeating-linear-gradient(
    180deg,
    #162033 0 18px,
    #e23b2c 18px 20px
  );
  z-index: 40;
}
a { color: inherit; }
button, select, input { font: inherit; color: inherit; }

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
}
.skip:focus {
  left: calc(var(--register) + 12px);
  background: #fff;
  padding: 8px 12px;
  z-index: 80;
}

.site-head {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-left: var(--register);
  padding: 14px 28px;
  background: color-mix(in srgb, var(--fog) 82%, white);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
}
.brand-mark {
  font-family: "Shippori Mincho", serif;
  font-weight: 700;
  font-size: 13px;
  color: var(--seal);
  letter-spacing: 0.18em;
}
.brand-title {
  font-weight: 600;
  font-size: 14px;
}
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 13px;
}
.nav a { text-decoration: none; color: var(--muted); }
.nav a:hover { color: var(--ink); }
.lang {
  display: flex;
  border: 1px solid var(--ink);
  overflow: hidden;
}
.lang button {
  border: 0;
  background: transparent;
  padding: 4px 10px;
  cursor: pointer;
}
.lang button[aria-pressed="true"] {
  background: var(--ink);
  color: #fff;
}

.wrap {
  margin-left: var(--register);
  padding: 0 28px 80px;
  max-width: 1240px;
}

.hero {
  padding: 56px 0 28px;
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 36px;
  align-items: end;
}
.kicker {
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--seal);
  font-weight: 600;
  margin: 0 0 12px;
}
h1 {
  font-family: "Shippori Mincho", serif;
  font-weight: 700;
  font-size: clamp(32px, 5vw, 58px);
  line-height: 1.22;
  margin: 0;
  letter-spacing: 0.02em;
}
.lede {
  font-size: 17px;
  max-width: 46em;
  color: var(--muted);
}
.hero-aside {
  border-left: 3px solid var(--seal);
  padding: 8px 0 8px 18px;
  font-size: 14px;
}
.hero-aside strong {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 28px;
  line-height: 1.1;
  color: var(--seal);
}

.method {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 28px 0 8px;
}
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 18px 18px 16px;
}
.card h3 {
  margin: 0 0 8px;
  font-size: 15px;
}
.card p, .card li { font-size: 13.5px; color: var(--muted); margin: 0; }
.metric-tag {
  display: inline-block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  background: var(--ink);
  color: #fff;
  padding: 2px 7px;
  margin-bottom: 10px;
}

section {
  margin-top: 56px;
}
.sec-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 16px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 10px;
}
.sec-head h2 {
  font-family: "Shippori Mincho", serif;
  font-size: clamp(24px, 3vw, 34px);
  margin: 0;
  font-weight: 700;
}
.sec-head p {
  margin: 0;
  max-width: 42em;
  color: var(--muted);
  font-size: 14px;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 0 0 14px;
}
.chip, .toolbar input, .toolbar select {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 6px 10px;
  cursor: pointer;
}
.chip[aria-pressed="true"] {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}
.toolbar input { min-width: 180px; cursor: text; }

.rank-wrap { overflow: auto; max-height: 640px; background: var(--paper); border: 1px solid var(--line); }
.rank-row {
  display: grid;
  grid-template-columns: 44px 168px 1fr 64px;
  gap: 10px;
  align-items: center;
  padding: 6px 12px;
  border-bottom: 1px solid #e4ebf3;
  font-size: 13px;
}
.rank-row.is-jp {
  background: var(--seal-soft);
}
.rank-row.is-major { background: #eef3f8; }
.bar {
  height: 10px;
  background: #d7dee8;
  position: relative;
}
.bar > span {
  position: absolute;
  inset: 0 auto 0 0;
  background: var(--teal);
}
.rank-row.is-jp .bar > span { background: var(--seal); }
.mono { font-family: "IBM Plex Mono", monospace; }

.stairs {
  display: grid;
  gap: 10px;
}
.stair {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 12px;
  align-items: center;
}
.stair-label { font-size: 13px; font-weight: 600; }
.stair-track {
  position: relative;
  height: 34px;
  background: #e7edf5;
  border: 1px solid var(--line);
}
.stair-fill {
  position: absolute;
  inset: 0 auto 0 0;
  display: flex;
  align-items: center;
  padding-left: 8px;
  color: #fff;
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  white-space: nowrap;
  overflow: hidden;
}
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  font-size: 13px;
  margin-bottom: 12px;
}
.swatch {
  display: inline-block;
  width: 11px;
  height: 11px;
  margin-right: 6px;
  vertical-align: -1px;
}

.heat {
  overflow: auto;
  background: var(--paper);
  border: 1px solid var(--line);
}
.heat table {
  border-collapse: collapse;
  width: 100%;
  font-size: 13px;
}
.heat th, .heat td {
  padding: 8px 10px;
  text-align: right;
  border-bottom: 1px solid #e4ebf3;
}
.heat th:first-child, .heat td:first-child { text-align: left; }
.heat td.cell { color: #fff; font-family: "IBM Plex Mono", monospace; }

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.bars-v { display: grid; gap: 8px; }
.hbar {
  display: grid;
  grid-template-columns: minmax(90px, 34%) 1fr 48px;
  gap: 8px;
  align-items: center;
  font-size: 13px;
}
.hbar .track { height: 12px; background: #e7edf5; }
.hbar .fill { height: 12px; background: var(--teal); }

.source {
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
}
.source a { color: var(--teal); }

.note {
  background: #fff7e8;
  border: 1px solid #e6d2a8;
  padding: 12px 14px;
  font-size: 13.5px;
}

.sources-list {
  columns: 2;
  gap: 28px;
  font-size: 14px;
}
.sources-list dt { font-weight: 600; margin-top: 10px; }
.sources-list dd { margin: 0 0 8px; color: var(--muted); }

footer {
  margin-left: var(--register);
  padding: 28px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 900px) {
  :root { --register: 10px; }
  .hero, .method, .grid-2 { grid-template-columns: 1fr; }
  .sec-head {
    flex-direction: column;
    align-items: flex-start;
  }
  .hero-aside {
    border-left: none;
    border-top: 3px solid var(--seal);
    padding: 14px 0 0 0;
  }
  .sources-list { columns: 1; }
  .site-head { padding: 10px 14px; }
  .wrap { padding: 0 14px 64px; }
  .nav { display: none; }
  .rank-row { grid-template-columns: 36px 92px 1fr 48px; }
  h1 { word-break: keep-all; }
  .sec-head h2 { word-break: keep-all; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}