:root {
  --bg: #f3f1ec;
  --panel: #ffffff;
  --ink: #131313;
  --muted: #7b7b77;
  --line: rgba(19,19,19,0.12);
  --yellow: #ffd21f;
  --red: #ef5d3d;
  --blue: #3168de;
  --cream: #f6ead9;
  --dark: #15181d;
  --shadow: 0 16px 32px rgba(20,20,20,0.05);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--ink);
}

.system-page {
  max-width: 1440px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  min-height: 100vh;
}

.side-rail {
  background: #f6f4ef;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
}

.rail-brand {
  background: var(--yellow);
  padding: 22px 18px 18px;
  border-bottom: 1px solid rgba(19,19,19,0.15);
}

.rail-kicker,
.rail-code,
.kicker,
.eyebrow,
.panel-warning-label {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 10px;
}

.rail-brand h1 {
  margin: 0;
  font-size: 3rem;
  line-height: 0.9;
  letter-spacing: -0.06em;
}

.rail-title {
  margin: 8px 0 6px;
  font-weight: 700;
}

.rail-meta,
.rail-owner,
.rail-link,
.rail-code,
.rail-label,
.panel-meta-row,
.metric-label,
.metric-note,
.bar-label-row,
.hero-side-note p,
p,
li {
  color: var(--muted);
}

.rail-nav {
  display: grid;
}

.rail-link {
  display: grid;
  gap: 4px;
  text-decoration: none;
  padding: 16px 18px;
  border-bottom: 1px solid rgba(19,19,19,0.08);
  background: transparent;
}

.rail-link.active {
  background: white;
  box-shadow: inset 4px 0 0 var(--yellow);
}

.rail-label {
  color: var(--ink);
  font-size: 1rem;
}

.rail-footer {
  margin-top: auto;
  padding: 18px;
  border-top: 1px solid rgba(19,19,19,0.08);
}

.main-stage {
  padding: 22px 24px 40px;
}

.top-bar {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  align-items: end;
  gap: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--ink);
}

.top-bar-index {
  font-size: clamp(4rem, 8vw, 5.8rem);
  line-height: 0.88;
  letter-spacing: -0.08em;
  font-weight: 800;
}

.top-bar-title-wrap h2 {
  margin: 12px 0 0;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1;
  text-align: right;
  letter-spacing: -0.05em;
}

.phase-tag {
  width: fit-content;
  margin-left: auto;
  background: var(--ink);
  color: white;
  padding: 6px 10px;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.panel-grid,
.wide-panel-grid,
.bar-group,
.sibling-row,
.footer-grid {
  display: grid;
  gap: 18px;
}

.hero-grid {
  grid-template-columns: 1.2fr 0.8fr;
  margin-top: 18px;
}

.panel,
.wide-panel {
  background: var(--panel);
  border: 1px solid rgba(19,19,19,0.08);
  box-shadow: var(--shadow);
}

.panel,
.wide-panel,
.sibling-panel {
  padding: 22px;
}

.span-2 { grid-column: span 2; }

.panel-meta-row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 12px;
  margin-bottom: 18px;
  border-bottom: 1px solid rgba(19,19,19,0.08);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.thesis-copy {
  margin: 0;
  font-size: 2rem;
  line-height: 1.28;
  color: var(--ink);
}

.thesis-copy.small {
  font-size: 1.35rem;
}

mark {
  background: var(--yellow);
  padding: 0 4px;
}

.metric-block {
  margin-top: 28px;
}

.metric-value {
  margin: 8px 0 0;
  font-size: 2rem;
  line-height: 1.1;
  color: var(--ink);
  font-weight: 800;
}

.metric-note {
  margin: 8px 0 0;
  font-size: 0.92rem;
  color: #1d9a68;
}

.mini-terminal {
  display: grid;
  gap: 10px;
  padding: 14px 16px;
  border: 1px solid rgba(19,19,19,0.08);
}

.terminal-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.95rem;
}

.wide-panel {
  margin-top: 18px;
}

.wide-panel-grid {
  grid-template-columns: 1fr 0.8fr;
  align-items: start;
}

.behavior-list {
  display: grid;
  gap: 10px;
}

.behavior-item {
  padding: 12px 14px;
  border: 1px solid rgba(19,19,19,0.08);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.9rem;
}

.triple-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 18px;
}

.data-panel ul,
.tall-panel ul {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.data-panel li,
.tall-panel li {
  position: relative;
  padding: 0 0 12px 18px;
}

.data-panel li::before,
.tall-panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--red);
}

.design-grid {
  grid-template-columns: 1.1fr 0.9fr;
}

.barcode-box {
  display: grid;
  place-items: center;
  padding: 20px;
  border: 1px solid rgba(19,19,19,0.08);
}

.barcode {
  width: 100%;
  height: 42px;
  background: repeating-linear-gradient(90deg, var(--ink) 0 2px, transparent 2px 5px);
  margin-bottom: 14px;
  opacity: 0.65;
}

.bar-group {
  margin-top: 8px;
}

.bar-item + .bar-item {
  margin-top: 10px;
}

.bar-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  margin-bottom: 6px;
}

.bar-track {
  width: 100%;
  height: 10px;
  background: #eceae4;
  overflow: hidden;
}

.bar-fill { height: 100%; }
.bar-fill.blue { background: var(--blue); }
.bar-fill.red { background: var(--red); }
.bar-fill.gold { background: var(--yellow); }
.bar-fill.ink { background: var(--ink); }

.sibling-row {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 18px;
}

.sibling-panel {
  font-weight: 800;
  letter-spacing: 0.04em;
  text-align: center;
}

.footer-grid {
  grid-template-columns: 1.2fr 0.8fr;
  margin-top: 18px;
}

.caution-box {
  background: var(--cream);
}

.tone-red { background: var(--red); color: white; }
.tone-blue { background: var(--blue); color: white; }
.tone-cream { background: var(--cream); }
.tone-paper { background: white; }
.tone-dark, .tone-ink { background: var(--dark); color: white; }
.tone-dark p, .tone-dark li, .tone-dark .kicker, .tone-ink p, .tone-ink .kicker, .tone-red p, .tone-red .kicker, .tone-blue span { color: inherit; }

@media (max-width: 1100px) {
  .system-page {
    grid-template-columns: 1fr;
  }

  .side-rail {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .hero-grid,
  .triple-grid,
  .wide-panel-grid,
  .design-grid,
  .sibling-row,
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .span-2 { grid-column: span 2; }
}

@media (max-width: 760px) {
  .main-stage {
    padding: 18px 14px 30px;
  }

  .top-bar,
  .hero-grid,
  .triple-grid,
  .wide-panel-grid,
  .design-grid,
  .sibling-row,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .span-2 { grid-column: span 1; }

  .top-bar-title-wrap h2 {
    text-align: left;
  }

  .phase-tag {
    margin-left: 0;
  }
}