@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;700;900&display=swap');

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --text-primary: #1f2328;
  --text-secondary: #656d76;
  --accent: #0969da;
  --accent-hover: #0550ae;
  --accent-gradient: linear-gradient(135deg, #1428a0, #00b4d8);
  --border: #d0d7de;
  --font: 'Noto Sans JP', system-ui, -apple-system, sans-serif;
  --max-w: 1100px;
  --radius: 12px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent-hover); }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

/* ─── Hero ─── */
.hero {
  text-align: center;
  padding: 100px 24px 80px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}
.hero .subtitle {
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  color: var(--text-secondary);
  margin-top: 12px;
}
.hero .tagline {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 8px;
  opacity: .8;
}
.badge {
  display: inline-block;
  margin-top: 20px;
  padding: 4px 14px;
  font-size: 0.8rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-secondary);
}
.cta {
  display: inline-block;
  margin-top: 28px;
  padding: 14px 36px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  border-radius: 8px;
  transition: background .2s, transform .15s;
}
.cta:hover { background: var(--accent-hover); color: #fff; transform: translateY(-2px); }

/* ─── Sections ─── */
section { padding: 72px 0; }
section:nth-child(even) { background: var(--bg-secondary); }

.section-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 32px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

/* ─── Spec Grid ─── */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}
.spec-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 1px 3px rgba(31,35,40,0.04);
}
.spec-card .label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: .08em;
}
.spec-card .value {
  font-size: 1.1rem;
  font-weight: 700;
  margin-top: 4px;
}

/* ─── Storage Table ─── */
.storage-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 8px;
}
.storage-table th,
.storage-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.storage-table th {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: .06em;
  background: var(--bg-card);
}
.storage-table td { font-size: 0.95rem; }
.speed-bar {
  display: inline-block;
  height: 6px;
  border-radius: 3px;
  background: var(--accent-gradient);
  vertical-align: middle;
  margin-left: 8px;
}

/* ─── Experiment Cards ─── */
.exp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}
.exp-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color .2s, transform .15s;
}
.exp-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.exp-card .exp-icon { font-size: 2rem; margin-bottom: 12px; }
.exp-card h3 { font-size: 1.15rem; margin-bottom: 8px; }
.exp-card .exp-tool {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}
.exp-card p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.7; }
.exp-card .exp-hypothesis {
  margin-top: 14px;
  padding: 10px 14px;
  background: rgba(47, 129, 247, .08);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  font-size: 0.88rem;
  color: var(--text-primary);
}

/* ─── Code Block ─── */
.code-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  overflow-x: auto;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-primary);
}

/* ─── Links List ─── */
.links-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
}
.links-list li {
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: border-color .2s;
}
.links-list li:hover { border-color: var(--accent); }
.links-list a { font-weight: 700; }
.links-list .link-desc { font-size: 0.85rem; color: var(--text-secondary); margin-top: 2px; }

/* ─── Chart (Bar Graph) ─── */
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
}

.chart-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 20px;
  box-shadow: 0 1px 3px rgba(31,35,40,0.04);
}
.chart-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}
.chart-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}
.chart-title {
  font-size: 1.15rem;
  font-weight: 700;
  flex-grow: 1;
}
.chart-badge {
  font-size: 0.75rem;
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.chart-bars {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.chart-row {
  display: flex;
  align-items: center;
  gap: 12px;
}
.chart-row--best .chart-drive {
  color: #1a7f37;
  font-weight: 700;
}
.chart-label {
  min-width: 200px;
  flex-shrink: 0;
  font-size: 0.9rem;
}
.chart-drive {
  font-weight: 600;
  color: var(--text-primary);
}
.chart-drive-name {
  color: var(--text-secondary);
  font-size: 0.85rem;
}
.chart-bar-wrap {
  flex-grow: 1;
  background: #f0f0f0;
  border-radius: 6px;
  overflow: hidden;
  min-height: 36px;
}
.chart-bar {
  height: 36px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 0 12px;
  transition: width 0.6s ease;
  min-width: fit-content;
}
.chart-val {
  font-size: 0.82rem;
  font-weight: 700;
  color: #fff;
  text-shadow: 0 1px 3px rgba(0,0,0,0.5);
  white-space: nowrap;
}

.chart-sub {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.chart-sub-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 14px;
}
.chart-sub .chart-label {
  min-width: 200px;
}

.chart-updated {
  margin-top: 24px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  text-align: right;
}

@media (max-width: 768px) {
  .chart-row { flex-direction: column; align-items: stretch; gap: 4px; }
  .chart-label { min-width: unset; }
  .chart-sub .chart-label { min-width: unset; }
  .chart-legend { gap: 10px; }
}

/* ─── Footer ─── */
footer {
  padding: 40px 24px;
  text-align: center;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.85rem;
}
footer a { color: var(--text-secondary); text-decoration: underline; }
footer a:hover { color: var(--accent); }
footer .footer-links { margin-top: 8px; }
footer .footer-links a + a { margin-left: 20px; }

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .hero { padding: 64px 20px 56px; }
  section { padding: 48px 0; }
  .storage-table { font-size: 0.85rem; }
  .storage-table th, .storage-table td { padding: 10px 12px; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 1.8rem; }
  .exp-grid { grid-template-columns: 1fr; }
  .spec-grid { grid-template-columns: 1fr; }
}