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

:root {
  --bg: #f8f7f4;
  --text: #1a1a1a;
  --text-secondary: #666;
  --text-tertiary: #999;
  --border: #e0ddd8;
  --card-bg: #fff;
  --card-hover: #fafaf8;
  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --serif: Georgia, "Times New Roman", serif;
  --mono: "SF Mono", "Cascadia Code", Consolas, monospace;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 32px;
}

/* --- Hero --- */
.hero {
  padding: 120px 0 80px;
  text-align: left;
}

.hero-title {
  font-family: var(--sans);
  font-size: 4rem;
  font-weight: 300;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.1;
}

.hero-subtitle {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-style: italic;
  color: var(--text-secondary);
  margin-top: 16px;
}

#orbit-canvas { display: none; }

/* --- Sections --- */
section {
  padding: 64px 0;
  border-top: 1px solid var(--border);
}

.section-title {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-tertiary);
  margin-bottom: 40px;
}

/* --- About --- */
.about-text {
  font-family: var(--serif);
  font-size: 1.15rem;
  line-height: 1.75;
  color: var(--text-secondary);
  max-width: 580px;
}

.about-text p { margin-bottom: 20px; }

.stats-row {
  display: flex;
  gap: 48px;
  margin-top: 48px;
  flex-wrap: wrap;
}

.stat { display: flex; flex-direction: column; }

.stat-value {
  font-family: var(--sans);
  font-size: 2.2rem;
  font-weight: 300;
  color: var(--text);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
  margin-top: 4px;
}

/* --- Experiments grid --- */
.experiments-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border: 1px solid var(--border);
}

.experiment-card {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--card-bg);
  text-decoration: none;
  color: var(--text);
  transition: background 0.15s;
  border-bottom: 1px solid var(--border);
  width: 100%;
}

.experiment-card:hover {
  background: var(--card-hover);
}

.card-title { font-size: 0.9rem; font-weight: 400; }
.card-arrow { color: var(--text-tertiary); font-size: 0.8rem; opacity: 0; transition: opacity 0.15s; }
.experiment-card:hover .card-arrow { opacity: 1; }

.empty-note {
  color: var(--text-tertiary);
  font-family: var(--serif);
  font-style: italic;
  padding: 20px 24px;
  background: var(--card-bg);
}

/* --- Tools --- */
.tools-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
}

.tool-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 24px;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
}
.tool-card:last-child { border-bottom: none; }

.tool-name {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text);
}

.tool-desc {
  font-size: 0.82rem;
  color: var(--text-tertiary);
}

/* --- Diary --- */
.diary-content {
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.diary-content h1, .diary-content h2, .diary-content h3 {
  font-family: var(--sans);
  color: var(--text);
  font-weight: 400;
  margin: 40px 0 16px 0;
}

.diary-content h1 { font-size: 1.5rem; }
.diary-content h2 { font-size: 1.2rem; }
.diary-content h3 { font-size: 1rem; font-weight: 500; }

.diary-content p { margin-bottom: 16px; }
.diary-content ul { padding-left: 24px; margin-bottom: 16px; }
.diary-content li { margin-bottom: 8px; }
.diary-content strong { color: var(--text); font-weight: 600; }

.diary-content code {
  font-family: var(--mono);
  font-size: 0.85em;
  color: var(--text);
  background: rgba(0,0,0,0.04);
  padding: 2px 5px;
  border-radius: 3px;
}

.diary-content pre {
  background: rgba(0,0,0,0.03);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 16px;
  overflow-x: auto;
  margin-bottom: 16px;
}

.diary-content pre code { background: none; padding: 0; }

.diary-content a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--border);
  text-underline-offset: 3px;
}

.diary-content a:hover { text-decoration-color: var(--text); }

/* --- Footer --- */
footer {
  padding: 48px 0 64px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.heartbeat { display: flex; align-items: center; gap: 8px; }

.heartbeat-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-tertiary);
}

/* --- Responsive --- */
@media (max-width: 600px) {
  .hero { padding: 80px 0 48px; }
  .hero-title { font-size: 2.5rem; }
  .stats-row { gap: 32px; }
  footer { flex-direction: column; gap: 12px; text-align: center; }
  section { padding: 40px 0; }
  .container { padding: 0 20px; }
}