@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:ital,wght@0,300;0,400;0,600;0,700;1,400&display=swap');

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

:root {
  --bg: #0a0a0a;
  --surface: #111111;
  --surface-hover: #1a1a1a;
  --border: #222;
  --border-bright: #333;
  --text: #aaa;
  --text-bright: #ddd;
  --text-muted: #555;
  --accent: #00ff41;
  --accent-dim: #00cc33;
  --accent-glow: rgba(0, 255, 65, 0.08);
  --level-1: #888;
  --level-2: #6b9bd2;
  --level-3: #b48ead;
  --level-4: #ebcb8b;
  --level-5: #a3be8c;
  --font: 'JetBrains Mono', 'Fira Code', 'SF Mono', 'Cascadia Code', monospace;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9rem;
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: opacity 0.15s;
}

a:hover {
  opacity: 0.8;
}

/* ── Layout ─────────────────────────────── */

.container {
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Header ─────────────────────────────── */

header {
  border-bottom: 1px solid var(--border);
  padding: 2rem 0;
}

.site-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.site-title a {
  color: var(--accent);
}

.cursor {
  display: inline-block;
  width: 0.6em;
  height: 1.1em;
  background: var(--accent);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.site-tagline {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: 0.25rem;
}

nav {
  margin-top: 0.75rem;
  font-size: 0.8rem;
}

nav a {
  color: var(--text-muted);
  margin-right: 1.5rem;
}

nav a:hover {
  color: var(--accent);
}

nav a.active {
  color: var(--accent);
}

/* ── Hero / Intro ──────────────────────── */

.hero {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--border);
}

.hero-intro {
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.8;
  max-width: 640px;
}

.hero-intro p {
  margin-bottom: 1rem;
}

.hero-intro strong {
  color: var(--text-bright);
}

/* ── Agentic Ladder ────────────────────── */

.ladder {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--border);
}

.ladder h2 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1.5rem;
}

.ladder-levels {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.ladder-level {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.5rem 0;
  font-size: 0.8rem;
}

.ladder-num {
  width: 2rem;
  text-align: right;
  font-weight: 700;
  flex-shrink: 0;
}

.ladder-bar {
  height: 4px;
  border-radius: 2px;
  flex-shrink: 0;
}

.ladder-label {
  color: var(--text);
  flex-shrink: 0;
  min-width: 140px;
}

.ladder-desc {
  color: var(--text-muted);
  font-size: 0.75rem;
}

.ladder-level[data-level="1"] .ladder-num { color: var(--level-1); }
.ladder-level[data-level="1"] .ladder-bar { background: var(--level-1); width: 30px; }
.ladder-level[data-level="2"] .ladder-num { color: var(--level-2); }
.ladder-level[data-level="2"] .ladder-bar { background: var(--level-2); width: 50px; }
.ladder-level[data-level="3"] .ladder-num { color: var(--level-3); }
.ladder-level[data-level="3"] .ladder-bar { background: var(--level-3); width: 75px; }
.ladder-level[data-level="4"] .ladder-num { color: var(--level-4); }
.ladder-level[data-level="4"] .ladder-bar { background: var(--level-4); width: 100px; }
.ladder-level[data-level="5"] .ladder-num { color: var(--level-5); }
.ladder-level[data-level="5"] .ladder-bar { background: var(--level-5); width: 130px; }

/* ── Timeline Phases ───────────────────── */

.timeline {
  padding: 2rem 0;
}

.timeline > h2 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 2rem;
}

.phase {
  margin-bottom: 2.5rem;
}

.phase-header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.phase-era {
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-shrink: 0;
  min-width: 70px;
}

.phase-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-bright);
}

.phase-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  line-height: 1.6;
}

/* ── Post List ─────────────────────────── */

main {
  flex: 1;
}

.post-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.post-item {
  border: 1px solid var(--border);
  padding: 1.25rem 1.5rem;
  transition: background 0.15s, border-color 0.15s;
}

.post-item:hover {
  background: var(--surface-hover);
  border-color: var(--border-bright);
}

.post-item a {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.post-num {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 700;
  flex-shrink: 0;
  min-width: 1.5rem;
  text-align: right;
  padding-top: 0.15rem;
}

.post-content {
  flex: 1;
  min-width: 0;
}

.post-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-bright);
  margin-bottom: 0.25rem;
  line-height: 1.4;
}

.post-item:hover .post-title {
  color: var(--accent);
}

.post-meta {
  font-size: 0.7rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.post-excerpt {
  font-size: 0.82rem;
  color: var(--text);
  line-height: 1.6;
  margin-top: 0.4rem;
}

/* ── Level Badge ───────────────────────── */

.level-badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 600;
  padding: 0.1rem 0.45rem;
  border-radius: 2px;
  letter-spacing: 0.02em;
}

.level-badge[data-level="1"] { color: var(--level-1); border: 1px solid var(--level-1); }
.level-badge[data-level="2"] { color: var(--level-2); border: 1px solid var(--level-2); }
.level-badge[data-level="3"] { color: var(--level-3); border: 1px solid var(--level-3); }
.level-badge[data-level="4"] { color: var(--level-4); border: 1px solid var(--level-4); }
.level-badge[data-level="5"] { color: var(--level-5); border: 1px solid var(--level-5); }

.tag {
  display: inline-block;
  font-size: 0.65rem;
  color: var(--accent-dim);
  border: 1px solid var(--border);
  padding: 0.05rem 0.4rem;
}

/* ── Blog Post Page ────────────────────── */

.post-page {
  padding: 2rem 0;
}

.back-link {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.back-link:hover {
  color: var(--accent);
}

.post-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.post-header h1 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-bright);
  line-height: 1.35;
  margin-bottom: 0.75rem;
}

.post-header .post-meta {
  font-size: 0.75rem;
  gap: 0.5rem;
}

.post-header .post-meta span {
  display: inline-block;
}

/* ── Article Content ───────────────────── */

article h2 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-bright);
  margin: 2.5rem 0 0.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

article h2:first-child {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

article h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-bright);
  margin: 1.5rem 0 0.5rem;
}

article p {
  margin-bottom: 1rem;
}

article ul, article ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

article li {
  margin-bottom: 0.35rem;
}

article strong {
  color: var(--text-bright);
  font-weight: 600;
}

article em {
  font-style: italic;
  color: var(--text-bright);
}

article hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

article table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1rem;
  font-size: 0.82rem;
}

article th {
  text-align: left;
  font-weight: 600;
  color: var(--text-bright);
  padding: 0.5rem 0.75rem;
  border-bottom: 2px solid var(--border-bright);
}

article td {
  padding: 0.4rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

article blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  margin: 1rem 0;
  color: var(--text);
  font-style: italic;
}

/* ── Code ───────────────────────────────── */

code {
  font-family: var(--font);
  font-size: 0.85em;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  color: var(--accent);
}

pre {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1.25rem;
  overflow-x: auto;
  margin-bottom: 1rem;
  line-height: 1.5;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.8rem;
  color: var(--text);
}

/* ── Callout boxes ──────────────────────── */

.callout {
  border-left: 3px solid var(--accent);
  background: var(--accent-glow);
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  font-size: 0.85rem;
}

.callout-label {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

.callout-warn {
  border-left-color: #f0c674;
}

.callout-warn .callout-label {
  color: #f0c674;
}

/* ── Post Navigation ───────────────────── */

.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
}

.post-nav a {
  color: var(--text-muted);
  max-width: 48%;
}

.post-nav a:hover {
  color: var(--accent);
}

.post-nav .nav-label {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.post-nav .next {
  text-align: right;
  margin-left: auto;
}

/* ── About Page ────────────────────────── */

.about-content {
  padding: 2rem 0;
}

.about-content h2 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
  margin: 2.5rem 0 0.75rem;
  text-transform: lowercase;
}

.about-content h2:first-of-type {
  margin-top: 1.5rem;
}

.about-content p {
  margin-bottom: 1rem;
  line-height: 1.8;
}

.about-content ul {
  list-style: none;
  padding: 0;
  margin-bottom: 1rem;
}

.about-content li {
  padding: 0.25rem 0;
  padding-left: 1.5rem;
  position: relative;
}

.about-content li::before {
  content: ">";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 600;
}

/* ── ASCII dividers ─────────────────────── */

.divider {
  color: var(--text-muted);
  text-align: center;
  font-size: 0.75rem;
  margin: 2rem 0;
  user-select: none;
}

/* ── Footer ─────────────────────────────── */

footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  font-size: 0.75rem;
  color: var(--text-muted);
}

footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ── Ad slot placeholder ────────────────── */

.ad-slot {
  border: 1px dashed var(--border);
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
  margin: 2rem 0;
  display: none;
}

/* ── Responsive ─────────────────────────── */

@media (max-width: 600px) {
  html { font-size: 15px; }
  .hero { padding: 2rem 0 1.5rem; }
  .post-header h1 { font-size: 1.15rem; }
  .post-item a { flex-direction: column; gap: 0.25rem; }
  .post-num { text-align: left; min-width: auto; }
  .ladder-level { flex-wrap: wrap; }
  .ladder-desc { flex-basis: 100%; padding-left: 3rem; }
  .phase-header { flex-direction: column; gap: 0.25rem; }
  pre { padding: 0.75rem; }
  .post-nav { flex-direction: column; }
  .post-nav .next { text-align: left; margin-left: 0; }
  footer .container {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }
}