/* ============================================================
   PostSynaptic — Brand CSS
   PS:// — postsynaptic.dev
   Author: Michael Kent
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:ital,wght@0,300;0,400;0,500;0,600;1,300;1,400&display=swap');

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --substrate:       #0E1117;
  --substrate-soft:  #131820;
  --substrate-border:#1E2530;
  --signal:          #00D4FF;
  --signal-dim:      #0099BB;
  --signal-glow:     rgba(0,212,255,0.10);
  --output:          #E8EAF0;
  --output-dim:      #B0B4C0;
  --noise:           #6B7280;
  --latent:          #C0E8F0;

  --font-mono:       'IBM Plex Mono', 'Courier New', monospace;

  --max-width:       740px;
  --col-gap:         2rem;
  --reading-gap:     1.75rem;
}

/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 17px; scroll-behavior: smooth; }

body {
  background: var(--substrate);
  color: var(--output);
  font-family: var(--font-mono);
  font-weight: 300;
  line-height: 1.75;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── Scanline overlay ──────────────────────────────────────── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,212,255,0.015) 2px,
    rgba(0,212,255,0.015) 4px
  );
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

/* ── Site header ────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(14,17,23,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--substrate-border);
  padding: 0 2rem;
}

.site-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  gap: 2rem;
}

.site-logo {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 1rem;
  color: var(--output);
  text-decoration: none;
  letter-spacing: 0.02em;
  display: flex;
  align-items: baseline;
  gap: 0;
}

.site-logo .accent { color: var(--signal); }

.site-logo .shortcode {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--noise);
  letter-spacing: 0.08em;
  margin-left: 0.6rem;
  align-self: center;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.site-nav a {
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--noise);
  text-decoration: none;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 0.15s;
}

.site-nav a:hover { color: var(--output); }
.site-nav a.active { color: var(--signal); }

.nav-cta {
  font-family: var(--font-mono);
  font-size: 0.68rem !important;
  color: var(--signal) !important;
  border: 1px solid var(--signal-dim);
  padding: 0.35rem 0.85rem;
  letter-spacing: 0.08em !important;
  text-transform: uppercase !important;
  transition: background 0.15s, color 0.15s !important;
}

.nav-cta:hover {
  background: var(--signal-glow) !important;
  color: var(--signal) !important;
}

/* ── Page layout ────────────────────────────────────────────── */
.page-wrapper {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem 5rem;
}

/* ── Hero ───────────────────────────────────────────────────── */
.hero {
  padding: 5rem 0 4rem;
  border-bottom: 1px solid var(--substrate-border);
  margin-bottom: 3.5rem;
}

.hero-kicker {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.hero-kicker::before {
  content: '';
  display: inline-block;
  width: 20px;
  height: 1px;
  background: var(--signal);
}

.hero-title {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: clamp(1.8rem, 4.5vw, 2.6rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--output);
  margin-bottom: 1.25rem;
}

.hero-title em {
  font-style: normal;
  color: var(--signal);
}

.hero-sub {
  font-size: 0.9rem;
  color: var(--noise);
  max-width: 520px;
  line-height: 1.65;
  margin-bottom: 2rem;
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.hero-meta-item {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--noise);
  letter-spacing: 0.06em;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.hero-meta-item .dot {
  width: 5px;
  height: 5px;
  background: var(--signal);
  border-radius: 50%;
  display: inline-block;
}

/* ── Post list ──────────────────────────────────────────────── */
.post-list-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.post-list-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--noise);
}

.post-list-count {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--substrate-border);
  letter-spacing: 0.06em;
}

.post-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.post-item {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 1.5rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--substrate-border);
  text-decoration: none;
  color: inherit;
  transition: background 0.15s;
  align-items: start;
}

.post-item:first-child { border-top: 1px solid var(--substrate-border); }
.post-item:hover .post-item-title { color: var(--signal); }

.post-item-date {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--noise);
  letter-spacing: 0.04em;
  padding-top: 0.25rem;
  line-height: 1.4;
}

.post-item-date .year {
  display: block;
  color: var(--substrate-border);
  font-size: 0.6rem;
  margin-top: 2px;
}

.post-item-body {}

.post-item-tags {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 0.4rem;
  flex-wrap: wrap;
}

.post-tag {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal-dim);
  background: var(--signal-glow);
  padding: 0.15rem 0.5rem;
  border-radius: 2px;
}

.post-item-title {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.3;
  color: var(--output);
  letter-spacing: 0;
  margin-bottom: 0.35rem;
  transition: color 0.15s;
}

.post-item-excerpt {
  font-size: 0.82rem;
  color: var(--noise);
  line-height: 1.6;
}

/* ── Newsletter strip ───────────────────────────────────────── */
.newsletter-strip {
  margin: 4rem 0 0;
  padding: 2.5rem;
  border: 1px solid var(--substrate-border);
  background: var(--substrate-soft);
  position: relative;
  overflow: hidden;
}

.newsletter-strip::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--signal);
}

.newsletter-kicker {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: 0.75rem;
}

.newsletter-title {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
  color: var(--output);
  margin-bottom: 0.5rem;
}

.newsletter-sub {
  font-size: 0.82rem;
  color: var(--noise);
  margin-bottom: 1.25rem;
  max-width: 420px;
}

.newsletter-form {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.newsletter-form input {
  flex: 1;
  min-width: 220px;
  background: var(--substrate);
  border: 1px solid var(--substrate-border);
  color: var(--output);
  padding: 0.65rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  outline: none;
  transition: border-color 0.15s;
}

.newsletter-form input::placeholder { color: var(--noise); opacity: 0.5; }
.newsletter-form input:focus { border-color: var(--signal-dim); }

.newsletter-form button {
  background: var(--signal);
  color: var(--substrate);
  border: none;
  padding: 0.65rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.15s;
}

.newsletter-form button:hover { background: #33dfff; }

/* ── Site footer ────────────────────────────────────────────── */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--substrate-border);
  padding: 2rem;
  margin-top: 2rem;
}

.site-footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-logo {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--noise);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.footer-logo span { color: var(--signal); }

.footer-links {
  display: flex;
  gap: 1.25rem;
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--noise);
  text-decoration: none;
  transition: color 0.15s;
}

.footer-links a:hover { color: var(--signal); }

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--substrate-border);
  letter-spacing: 0.04em;
  width: 100%;
  margin-top: 0.5rem;
}

/* ── Post page ──────────────────────────────────────────────── */
.post-header {
  padding: 4rem 0 2.5rem;
  border-bottom: 1px solid var(--substrate-border);
  margin-bottom: 3rem;
}

.post-header .post-tag { margin-right: 0.25rem; }

.post-title {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--output);
  margin: 1rem 0 0.75rem;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}

.post-meta-item {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--noise);
  letter-spacing: 0.06em;
}

.post-meta-sep {
  width: 3px;
  height: 3px;
  background: var(--substrate-border);
  border-radius: 50%;
  display: inline-block;
}

/* ── Post body ──────────────────────────────────────────────── */
.post-body {
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--output-dim);
}

.post-body h2 {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--output);
  margin: 2.5rem 0 0.75rem;
  padding-top: 0.5rem;
}

.post-body h3 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 2rem 0 0.6rem;
}

.post-body p { margin-bottom: 1.4rem; }

.post-body strong {
  font-weight: 500;
  color: var(--output);
}

.post-body em { font-style: italic; color: var(--output); }

.post-body a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid var(--signal-dim);
  transition: border-color 0.15s;
}

.post-body a:hover { border-color: var(--signal); }

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--signal);
  background: var(--signal-glow);
  padding: 0.1em 0.4em;
  border-radius: 2px;
}

.post-body pre {
  background: var(--substrate-soft);
  border: 1px solid var(--substrate-border);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--output-dim);
}

.post-body pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.post-body blockquote {
  border-left: 2px solid var(--signal);
  padding: 0.5rem 0 0.5rem 1.5rem;
  margin: 1.5rem 0;
  color: var(--noise);
  font-style: italic;
}

.post-body ul, .post-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1.4rem;
}

.post-body li { margin-bottom: 0.4rem; }

.post-body hr {
  border: none;
  border-top: 1px solid var(--substrate-border);
  margin: 2.5rem 0;
}

/* ── Post footer ────────────────────────────────────────────── */
.post-footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--substrate-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.post-back {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--noise);
  text-decoration: none;
  transition: color 0.15s;
}

.post-back:hover { color: var(--signal); }

.post-channel-links {
  display: flex;
  gap: 1rem;
}

.post-channel-links a {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--noise);
  text-decoration: none;
  transition: color 0.15s;
}

.post-channel-links a:hover { color: var(--signal); }

/* ── Utilities ──────────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

/* ── Animations ─────────────────────────────────────────────── */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hero             { animation: fade-up 0.5s ease both; }
.post-list        { animation: fade-up 0.5s 0.1s ease both; }
.newsletter-strip { animation: fade-up 0.5s 0.2s ease both; }

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 600px) {
  .site-nav { display: none; }
  .post-item { grid-template-columns: 1fr; gap: 0.25rem; }
  .post-item-date { font-size: 0.65rem; }
  .newsletter-form { flex-direction: column; }
  .newsletter-form input, .newsletter-form button { width: 100%; }
  .site-footer-inner { flex-direction: column; align-items: flex-start; }
}