/* ============================================================
   backofthenapkin.tech — styles
   Same DNA as changeis.io and waynekirkschmidt.me
   ============================================================ */

:root {
  --ink:      #0f2742;
  --navy:     #1a2f52;
  --brand:    #244a86;
  --accent:   #3b6fd4;
  --sky:      #7eb3f5;
  --white:    #ffffff;
  --light:    rgba(255,255,255,0.72);
  --muted:    rgba(255,255,255,0.45);
  --frost:    rgba(255,255,255,0.08);
  --frost-md: rgba(255,255,255,0.13);
  --frost-lg: rgba(255,255,255,0.92);
  --border:   rgba(255,255,255,0.14);
  --mono:     'IBM Plex Mono', monospace;
  --sans:     'DM Sans', system-ui, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background-image: url('./background.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  min-height: 100vh;
  color: var(--white);
  -webkit-font-smoothing: antialiased;
}

/* ── NAV ── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 58px;
  background: rgba(15,39,66,0.55);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  text-decoration: none;
  letter-spacing: -0.3px;
}

.nav-logo span {
  color: var(--sky);
  font-weight: 300;
}

.nav-availability {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(33,163,102,0.15);
  border: 1px solid rgba(33,163,102,0.35);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.72rem;
  font-weight: 600;
  color: #7dffc4;
  white-space: nowrap;
}

.nav-availability::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #21a366;
  animation: pulse 2s infinite;
  flex-shrink: 0;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--light);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.3px;
  transition: color 0.15s;
}

.nav-links a:hover { color: var(--white); }

/* ── MAIN TWO-COLUMN LAYOUT ── */
.main-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: calc(100vh - 58px);
}

/* ── LEFT: KOAN PANEL ── */
.koan-panel {
  position: sticky;
  top: 58px;
  height: calc(100vh - 58px);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding: 6rem 3rem 4rem 4rem;
  border-right: 1px solid var(--border);
}

.hero-eyebrow {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sky);
  margin-bottom: 2rem;
  opacity: 0.85;
}

.hero-title {
  font-size: clamp(1.4rem, 2.5vw, 2.2rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.5px;
  color: var(--white);
}

.hero-title em {
  font-style: italic;
  color: var(--sky);
  font-weight: 300;
  display: block;
}

.hero-title em.mid {
  font-weight: 400;
  color: var(--light);
}

/* ── RIGHT: ENTRIES PANEL ── */
.entries-panel {
  padding: 4rem 3rem 4rem 3rem;
  overflow-y: auto;
}

/* ── SECTIONS ── */
section {
  padding: 5rem 2rem;
}

.section-inner {
  max-width: 860px;
  margin: 0 auto;
}

.section-eyebrow {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sky);
  margin-bottom: 0.75rem;
  opacity: 0.8;
}

.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.5px;
  color: var(--white);
  margin-bottom: 1.25rem;
}

.section-intro {
  font-size: 1rem;
  color: var(--light);
  line-height: 1.75;
  max-width: 600px;
  margin-bottom: 2rem;
  font-weight: 300;
}

/* ── SECTION DIVIDER ── */
.section-divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.section-divider-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sky);
  opacity: 0.7;
  white-space: nowrap;
}

.divider-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, rgba(126,179,245,0.25), transparent);
}

/* ── FILTER BUTTONS ── */
.post-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.filter-btn {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 5px 12px;
  background: var(--frost);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s;
}

.filter-btn:hover { color: var(--light); border-color: rgba(255,255,255,0.25); }

.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
}

/* ── POST LIST ── */
.post-list { display: flex; flex-direction: column; }

.post-row {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: 0 20px;
  align-items: baseline;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: inherit;
  transition: background 0.1s;
}

.post-row:hover .post-title { color: var(--white); }

.post-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.post-date {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.05em;
}

.post-type {
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--sky);
}

.post-title {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.2px;
  color: var(--light);
  margin: 0 0 4px;
  transition: color 0.15s;
}

.post-summary {
  font-size: 0.8rem;
  font-weight: 300;
  color: var(--muted);
  line-height: 1.5;
  margin: 0;
}

.post-tag {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 3px 9px;
  background: var(--frost);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--muted);
  white-space: nowrap;
  align-self: center;
}

/* ── ABOUT ── */
#about { background: rgba(15,39,66,0.3); }

.about-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ── BUTTONS ── */
.btn-ghost {
  background: transparent;
  color: var(--white);
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: border-color 0.2s, background 0.2s;
  display: inline-block;
}

.btn-ghost:hover {
  border-color: rgba(255,255,255,0.35);
  background: var(--frost);
}

/* ── FOOTER ── */
footer {
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  border-top: 1px solid var(--border);
  background: rgba(10,25,50,0.6);
}

.footer-name {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--white);
}

.footer-copy {
  font-size: 0.75rem;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.05em;
  transition: color 0.15s;
}

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

/* ── REVEAL ── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ── MOBILE ── */
@media (max-width: 640px) {
  .nav-links    { display: none; }
  .nav-availability { font-size: 0.65rem; padding: 3px 10px; }
  .hero         { padding: 3rem 1.5rem 2rem; min-height: 80vh; }
  section       { padding: 3.5rem 1.5rem; }
  .post-row     { grid-template-columns: 1fr; gap: 6px; }
  .post-tag     { display: none; }
}

/* ── TWO-COLUMN LAYOUT ── */
.posts-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 3rem;
  align-items: start;
}

/* ── POST LIST ── */
.post-list { display: flex; flex-direction: column; }

.post-row {
  display: grid;
  grid-template-columns: 90px 1fr auto;
  gap: 0 16px;
  align-items: baseline;
  padding: 1rem 0.75rem;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  border-radius: 6px;
  transition: background 0.15s;
}

.post-row.live:hover { background: var(--frost); }
.post-row.live:hover .post-title { color: var(--white); }

.post-row.active {
  background: var(--frost-md);
  border-bottom-color: transparent;
}

.post-row.active .post-title { color: var(--white); }

/* ── PREVIEW PANEL ── */
.post-preview {
  position: sticky;
  top: 80px;
  background: var(--frost);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  min-height: 300px;
}

.preview-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
}

.preview-empty-text {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.preview-loading {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 2rem;
}

.preview-kicker {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sky);
  display: flex;
  gap: 10px;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.preview-kicker span + span::before {
  content: '·';
  margin-right: 10px;
  opacity: 0.4;
}

.preview-title {
  font-size: 1.3rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.5px;
  color: var(--white);
  margin-bottom: 0.6rem;
}

.preview-tagline {
  font-size: 0.875rem;
  font-weight: 300;
  color: var(--light);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.preview-excerpt {
  font-size: 0.875rem;
  font-weight: 300;
  color: var(--light);
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

.preview-excerpt p { margin-bottom: 0.75rem; }

.preview-btn {
  font-size: 0.85rem;
  padding: 0.6rem 1.25rem;
}

/* ── COMING SOON ── */
.coming-soon {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  padding: 2rem 0;
}

.post-loading {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  padding: 1rem 0;
}

/* ── MOBILE ── */
@media (max-width: 768px) {
  .posts-layout {
    grid-template-columns: 1fr;
  }
  .post-preview {
    display: none;
  }
  .post-row.live {
    text-decoration: none;
  }
}

/* ── MOBILE OVERRIDES ── */
@media (max-width: 768px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
  .koan-panel {
    position: relative;
    top: auto;
    height: auto;
    min-height: 60vh;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 3rem 1.5rem;
  }
  .entries-panel {
    padding: 2.5rem 1.5rem;
  }
  .posts-layout {
    grid-template-columns: 1fr;
  }
  .post-preview {
    display: none;
  }
}

/* ── ENTRY CARDS ── */
.entry-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.entry-card {
  display: block;
  background: var(--frost);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  transition: background 0.15s, border-color 0.15s;
}

.entry-card:hover {
  background: var(--frost-md);
  border-color: rgba(126,179,245,0.3);
}

.entry-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
}

.entry-kicker {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sky);
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.entry-kicker span + span::before {
  content: '·';
  margin-right: 8px;
  opacity: 0.4;
}

.entry-tag {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 2px 8px;
  background: var(--frost);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.entry-title {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.3px;
  color: var(--white);
  margin-bottom: 0.4rem;
}

.entry-tagline {
  font-size: 0.85rem;
  font-weight: 300;
  color: var(--light);
  line-height: 1.6;
  margin: 0;
}

.entry-divider {
  height: 1px;
  background: var(--border);
  margin: 1rem 0;
}

.entry-excerpt {
  font-size: 0.82rem;
  font-weight: 300;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.entry-excerpt p { margin-bottom: 0.5rem; }
.entry-excerpt p:last-child { margin-bottom: 0; }

.entry-read {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sky);
  display: inline-block;
  margin-top: 0.75rem;
  transition: opacity 0.15s;
}

.entry-card:hover .entry-read { opacity: 0.7; }