/* ============================================================
   Diary of an AI PM — Brand CSS
   D/AI — diaryofanaipm.com
   Author: Michael Kent
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Libre+Baskerville:ital,wght@0,400;0,700;1,400&family=DM+Sans:ital,wght@0,300;0,400;0,500;1,300;1,400&family=DM+Mono:wght@400&display=swap');

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --ink:          #1C1917;
  --ink-soft:     #231F1C;
  --ink-border:   #3D3530;
  --gilt:         #C8A96E;
  --gilt-dim:     #A08555;
  --gilt-glow:    rgba(200,169,110,0.10);
  --page:         #F5F0E8;
  --page-dim:     #D4CFC6;
  --red-pen:      #E8372A;
  --noise:        #8A7F74;
  --latent:       #EDE8DF;

  --font-serif:   'Libre Baskerville', Georgia, serif;
  --font-sans:    'DM Sans', system-ui, sans-serif;
  --font-mono:    'DM Mono', 'Courier New', monospace;

  --max-width:    680px;
  --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(--page);
  color: var(--ink);
  font-family: var(--font-sans);
  font-weight: 300;
  line-height: 1.75;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── Paper texture overlay ─────────────────────────────────── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  background-size: 256px 256px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.8;
}

/* ── Site header ────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245,240,232,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--ink-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-serif);
  font-weight: 400;
  font-size: 1rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
  display: flex;
  align-items: baseline;
  gap: 0;
}

.site-logo .accent { color: var(--gilt); font-style: italic; }

.site-logo .shortcode {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  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-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--noise);
  text-decoration: none;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color 0.15s;
}

.site-nav a:hover { color: var(--ink); }
.site-nav a.active { color: var(--gilt); }

.nav-cta {
  font-family: var(--font-mono);
  font-size: 0.68rem !important;
  color: var(--gilt) !important;
  border: 1px solid var(--gilt-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(--gilt-glow) !important;
  color: var(--gilt) !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(--ink-border);
  margin-bottom: 3.5rem;
}

.hero-kicker {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gilt);
  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(--gilt);
}

.hero-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(2rem, 4.5vw, 2.8rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 1.25rem;
}

.hero-title em {
  font-style: italic;
  color: var(--gilt);
}

.hero-sub {
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--noise);
  max-width: 480px;
  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(--gilt);
  border-radius: 50%;
  display: inline-block;
}

/* ── Coming soon / phase banner ────────────────────────────── */
.phase-banner {
  margin: 0 0 3.5rem;
  padding: 2rem 2.5rem;
  border: 1px solid var(--ink-border);
  background: var(--ink);
  color: var(--page);
  position: relative;
}

.phase-banner::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--red-pen);
}

.phase-banner-kicker {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--red-pen);
  margin-bottom: 0.5rem;
}

.phase-banner-text {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--page-dim);
  font-style: italic;
}

.phase-banner-text strong {
  color: var(--page);
  font-weight: 700;
  font-style: normal;
}

/* ── 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(--ink-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(--ink-border);
  text-decoration: none;
  color: inherit;
  transition: background 0.15s;
  align-items: start;
}

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

.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(--ink-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(--gilt-dim);
  background: var(--gilt-glow);
  padding: 0.15rem 0.5rem;
  border-radius: 2px;
}

.post-item-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.05rem;
  line-height: 1.3;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin-bottom: 0.35rem;
  transition: color 0.15s;
}

.post-item-excerpt {
  font-size: 0.85rem;
  color: var(--noise);
  line-height: 1.6;
}

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

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

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

.newsletter-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 0.5rem;
}

.newsletter-sub {
  font-size: 0.875rem;
  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(--page);
  border: 1px solid var(--ink-border);
  color: var(--ink);
  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(--gilt); }

.newsletter-form button {
  background: var(--ink);
  color: var(--page);
  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: var(--ink-soft); }

/* ── Site footer ────────────────────────────────────────────── */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--ink-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-serif);
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--noise);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.footer-logo span { color: var(--gilt); font-style: italic; }

.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(--gilt); }

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--ink-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(--ink-border);
  margin-bottom: 3rem;
}

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

.post-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ink);
  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(--ink-border);
  border-radius: 50%;
  display: inline-block;
}

/* ── Post body ──────────────────────────────────────────────── */
.post-body {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.post-body h2 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 2.5rem 0 0.75rem;
  padding-top: 0.5rem;
}

.post-body h3 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gilt);
  margin: 2rem 0 0.6rem;
}

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

.post-body strong {
  font-weight: 700;
  color: var(--ink);
}

.post-body em { font-style: italic; }

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

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

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  color: var(--red-pen);
  background: rgba(232,55,42,0.06);
  padding: 0.1em 0.4em;
  border-radius: 2px;
}

.post-body pre {
  background: var(--ink);
  border: 1px solid var(--ink-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(--page-dim);
}

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

.post-body blockquote {
  border-left: 2px solid var(--gilt);
  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(--ink-border);
  margin: 2.5rem 0;
}

/* ── Red pen annotation style (for editorial marks) ────────── */
.redpen {
  color: var(--red-pen);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.85em;
}

/* ── Post footer ────────────────────────────────────────────── */
.post-footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--ink-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(--gilt); }

.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(--gilt); }

/* ── 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; }
.phase-banner     { animation: fade-up 0.5s 0.1s 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; }
}