@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

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

body {
  font-family: var(--font-mono);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background 0.2s, color 0.2s;
}

/* ── Navigation bar ── */
.nav-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 32px;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}
.nav-brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-bar a {
  color: var(--text-dim);
  text-decoration: none;
  padding: 4px 10px;
  transition: color 0.15s;
}
.nav-bar a:hover, .nav-bar a.active { color: var(--text); }
html.dark .nav-bar a:hover, html.dark .nav-bar a.active { color: var(--teal); }

/* Theme toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  cursor: pointer;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: color 0.15s, border-color 0.15s;
  margin-left: 12px;
}
.theme-toggle:hover { color: var(--text); border-color: var(--text-dim); }

/* ── Slide system ── */
.slide {
  min-height: 100vh;
  max-width: 1100px;
  margin: 0 auto;
  padding: 60px 48px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.slide:last-child { border-bottom: none; }

/* ── Typography ── */
.section-label {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.section-label::before { content: '/'; opacity: 0.5; }

h2 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(36px, 4vw, 56px);
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 32px;
  color: var(--text);
}
h2 .dot { color: var(--green-dot); }

h3 {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text);
  margin-bottom: 16px;
}

p.desc {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-dim);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: 40px;
}

/* ── Two column layout ── */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

/* ── Footer ── */
.site-footer {
  text-align: center;
  padding: 40px;
  border-top: 1px solid var(--border);
}
.site-footer .footer-brand {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: 24px;
  letter-spacing: -0.04em;
  margin-bottom: 8px;
}
.site-footer .footer-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-faint);
}

/* ── Print ── */
@media print {
  .nav-bar { display: none; }
  .slide { min-height: auto; page-break-after: always; padding: 40px 24px; }
  body { background: #fff; color: #111; }
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .slide { padding: 80px 20px 40px; }
  .two-col { grid-template-columns: 1fr; gap: 24px; }
  .nav-links a:not(.active) { display: none; }
}