/* ── Variables ─────────────────────────────────────────── */
:root {
  --bg:         #f5f4f0;
  --fg:         #1a1916;
  --fg-muted:   #6b6860;
  --accent:     #1a1916;
  --border:     #d8d6d0;
  --mono:       'DM Mono', monospace;
  --sans:       'DM Sans', sans-serif;
  --max-w:      1080px;
  --gap:        2rem;
}

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

html {
  font-size: 22px;
  -webkit-font-smoothing: antialiased;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ────────────────────────────────────────────── */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.75rem var(--gap);
  border-bottom: 1px solid var(--border);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--fg);
}

.site-logo-mark {
  font-size: 0.6rem;
  color: var(--fg-muted);
  transition: color 0.2s;
}

.site-logo:hover .site-logo-mark { color: var(--fg); }

.site-logo-text {
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  gap: 2rem;
}

.nav-link {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--fg-muted);
  transition: color 0.2s;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--fg);
  transition: width 0.25s ease;
}

.nav-link:hover { color: var(--fg); }
.nav-link:hover::after { width: 100%; }
.nav-link--active { color: var(--fg); }
.nav-link--active::after { width: 100%; }

/* ── Main ──────────────────────────────────────────────── */
.main {
  flex: 1;
  padding: 4rem var(--gap);
  max-width: calc(var(--max-w) + var(--gap) * 2);
  width: 100%;
  margin: 0 auto;
}

/* ── Home ──────────────────────────────────────────────── */
.home {
  padding-top: 3rem;
}

.home-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--fg-muted);
  letter-spacing: 0.1em;
}

.home-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 300;
  line-height: 1.2;
  margin-top: 0.5rem;
  margin-bottom: 3.5rem;
  letter-spacing: -0.02em;
}

.home-nav {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--border);
}

.home-link {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: var(--fg);
  transition: padding-left 0.25s ease;
}

.home-link:hover { padding-left: 0.75rem; }

.home-link-num {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--fg-muted);
  min-width: 1.8rem;
}

.home-link-text {
  font-size: 1.1rem;
  font-weight: 300;
  flex: 1;
  letter-spacing: -0.01em;
}

.home-link-arrow {
  font-size: 0.9rem;
  color: var(--fg-muted);
  transition: transform 0.2s, color 0.2s;
}

.home-link:hover .home-link-arrow {
  transform: translateX(4px);
  color: var(--fg);
}

/* ── Page ──────────────────────────────────────────────── */
.page-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--fg-muted);
  letter-spacing: 0.14em;
}

.page-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-top: 0.4rem;
  margin-bottom: 0.75rem;
}

.page-subtitle {
  font-size: 1rem;
  color: var(--fg-muted);
  font-weight: 300;
  margin-bottom: 0;
}

.page-header {
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

/* ── Content typography ────────────────────────────────── */
.page-content { font-size: 0.95rem; }

.page-content p {
  margin-bottom: 1.25rem;
  color: var(--fg);
}

.page-content h2 {
  font-size: 0.72rem;
  font-family: var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  font-weight: 400;
}

.page-content h3 {
  font-size: 1rem;
  font-weight: 400;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.page-content ul, .page-content ol {
  padding-left: 1.25rem;
  margin-bottom: 1.25rem;
}

.page-content li {
  margin-bottom: 0.35rem;
  color: var(--fg);
}

.page-content code {
  font-family: var(--mono);
  font-size: 0.82em;
  background: var(--border);
  padding: 0.1em 0.35em;
  border-radius: 2px;
}

.page-content strong {
  font-weight: 500;
}

.page-content a {
  color: var(--fg);
  text-underline-offset: 3px;
}

.page-content a:hover {
  color: var(--fg-muted);
}

/* ── Footer ────────────────────────────────────────────── */
.site-footer {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem var(--gap);
  border-top: 1px solid var(--border);
}

.footer-line {
  display: block;
  width: 2rem;
  height: 1px;
  background: var(--border);
}

.footer-text {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--fg-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ── Responsive ────────────────────────────────────────── */
@media (max-width: 600px) {
  .site-header { padding: 1.25rem 1.25rem; }
  .main { padding: 2.5rem 1.25rem; }
  .site-nav { gap: 1.25rem; }
}

/* ── Substack form ─────────────────────────────────────── */
.substack-wrap {
  margin-top: 3rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

.substack-form-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.substack-input {
  flex: 1;
  font-family: var(--mono);
  font-size: 0.82rem;
  padding: 0.65rem 0.9rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg);
  outline: none;
  transition: border-color 0.2s;
  min-width: 0;
}

.substack-input::placeholder { color: var(--fg-muted); }
.substack-input:focus { border-color: var(--fg); }

.substack-btn {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  padding: 0.65rem 1.1rem;
  background: var(--fg);
  color: var(--bg);
  border: 1px solid var(--fg);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}

.substack-btn:hover {
  background: transparent;
  color: var(--fg);
}

.substack-note {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--fg-muted);
  margin: 0;
}

.substack-note a {
  color: var(--fg-muted);
  text-underline-offset: 2px;
}

.substack-note a:hover { color: var(--fg); }

@media (max-width: 480px) {
  .substack-form-row { flex-direction: column; }
  .substack-btn { width: 100%; text-align: center; }
}