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

:root {
  --bg: #0f0f0f;
  --surface: #1a1a1a;
  --border: #2a2a2a;
  --text: #e8e8e8;
  --muted: #666;
  --accent: #f97316;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  padding: 4rem 2rem 3rem;
  border-bottom: 1px solid var(--border);
  max-width: 720px;
  margin: 0 auto;
  width: 100%;
}

.logo-mark {
  display: grid;
  grid-template-columns: 1fr 1fr;
  width: 3rem;
  height: 3rem;
  gap: 3px;
  margin-bottom: 1.5rem;
}

.logo-mark span {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  border-radius: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
}

.logo-s { color: var(--accent); }
.logo-r { color: var(--text); }

header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--accent);
}

header .subtitle {
  margin-top: 0.4rem;
  color: var(--muted);
  font-size: 0.95rem;
}

main {
  flex: 1;
  max-width: 720px;
  margin: 0 auto;
  width: 100%;
  padding: 3rem 2rem;
}

h2 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.experiment-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.experiment-list li a {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.15s, background 0.15s;
}

.experiment-list li a:hover {
  border-color: var(--accent);
  background: #1f1f1f;
}

.experiment-list li a .num {
  font-size: 0.75rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  min-width: 2rem;
}

.experiment-list li a .title {
  font-weight: 500;
}

.experiment-list li a .desc {
  margin-left: auto;
  font-size: 0.85rem;
  color: var(--muted);
}

.placeholder {
  color: var(--muted);
  font-size: 0.9rem;
  padding: 1.5rem 0;
}

footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
  max-width: 720px;
  margin: 0 auto;
  width: 100%;
}

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

footer a:hover {
  color: var(--accent);
}