@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;600&display=swap');

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

:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-hover: #263348;
  --border: #2d3a4f;
  --border-bright: #3d4d66;
  --text: #94a3b8;
  --text-bright: #e2e8f0;
  --text-muted: #64748b;
  --accent: #818cf8;
  --accent-dim: #6366f1;
  --accent-glow: rgba(129, 140, 248, 0.06);
  --level-1: #94a3b8;
  --level-2: #7dd3fc;
  --level-3: #c4b5fd;
  --level-4: #fbbf24;
  --level-5: #86efac;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

.container {
  max-width: 720px;
  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;
  letter-spacing: -0.02em;
}

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

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

.cursor {
  display: none;
}

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

nav {
  margin-top: 0.75rem;
  font-size: 0.85rem;
}

nav a {
  color: var(--text-muted);
  margin-right: 1.5rem;
  font-weight: 500;
}

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: 0.95rem;
  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;
  font-family: var(--font-mono);
}

.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: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.post-excerpt {
  font-size: 0.85rem;
  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: 0.85rem;
  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: 1.5rem;
  font-weight: 700;
  color: var(--text-bright);
  line-height: 1.35;
  margin-bottom: 0.75rem;
}

.post-header .post-meta {
  font-size: 0.78rem;
  gap: 0.5rem;
}

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

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

article h2 {
  font-size: 1.1rem;
  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: 0.85rem;
}

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;
}

/* ── Memo preface (editorial intro on memo-style posts) ── */

.memo-preface {
  background: var(--surface);
  border-left: 3px solid var(--accent);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
  border-radius: 0 0.25rem 0.25rem 0;
}

.memo-preface p {
  margin: 0;
  color: var(--text);
  font-size: 0.92rem;
  line-height: 1.6;
  font-style: italic;
}

.memo-preface p + p {
  margin-top: 0.75rem;
}

/* ── Footnotes ─────────────────────────────────── */

.footnote-ref {
  font-size: 0.7em;
  vertical-align: super;
  line-height: 0;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  padding: 0 0.15em;
}

.footnote-ref:hover {
  text-decoration: underline;
}

.footnotes-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 3rem 0 1.25rem;
}

article ol.footnotes {
  list-style-position: outside;
  padding-left: 1.5rem;
  font-size: 0.85rem;
  color: var(--text);
  line-height: 1.6;
  margin-bottom: 1rem;
}

article ol.footnotes li {
  margin-bottom: 0.5rem;
}

article ol.footnotes li::marker {
  color: var(--text-muted);
}

.footnote-back {
  margin-left: 0.4em;
  color: var(--accent);
  text-decoration: none;
}

.footnote-back:hover {
  text-decoration: underline;
}

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

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.15em 0.4em;
  border-radius: 5px;
  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;
  border-radius: 6px;
}

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

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

.callout {
  border-left: 3px solid var(--accent);
  background: var(--accent-glow);
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  font-size: 0.88rem;
  border-radius: 0 6px 6px 0;
}

.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: #fbbf24;
}

.callout-warn .callout-label {
  color: #fbbf24;
}

/* ── 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: 0.85rem;
}

.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;
  font-family: var(--font-mono);
}

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

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

/* ── Home Page ─────────────────────────── */

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

.home-intro p {
  font-size: 1rem;
  color: var(--text);
  line-height: 1.8;
  max-width: 640px;
}

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

.tile-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.tile-heading h2 {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.35;
}

.tile-heading h2 a {
  color: var(--text-bright);
  transition: color 0.15s;
}

.tile-heading h2 a:hover {
  color: var(--accent);
}

.tile-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-shrink: 0;
  white-space: nowrap;
}

/* Fallback for tiles without .tile-heading wrapper */
.home-tile > .container > h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.35;
}

.home-tile > .container > h2 a {
  color: var(--text-bright);
  transition: color 0.15s;
}

.home-tile > .container > h2 a:hover {
  color: var(--accent);
}

.tile-tag {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(129, 140, 248, 0.2);
  padding: 0.15rem 0.6rem;
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}

.tile-desc {
  font-size: 0.92rem;
  color: var(--text);
  line-height: 1.75;
  max-width: 620px;
  margin-bottom: 0.5rem;
}

.tile-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 0.75rem;
}

.tile-link {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: 0.5rem;
}

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

/* ── Featured Tile (Two Claudes) ───────── */

.home-tile-featured {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(232, 168, 76, 0.04) 0%, rgba(91, 156, 245, 0.04) 100%);
}

.home-tile-featured .container {
  border-left: 3px solid;
  border-image: linear-gradient(to bottom, #E8A84C, #5B9CF5) 1;
  padding-left: 1.5rem;
}

.tile-tag-featured {
  display: inline-block;
  font-size: 0.6rem;
  font-weight: 600;
  background: linear-gradient(90deg, #E8A84C, #5B9CF5);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.home-tile-featured .tile-heading h2 {
  font-size: 1.35rem;
}

.home-tile-featured .tile-heading h2 a {
  color: var(--text-bright);
}

.home-tile-featured .tile-heading h2 a:hover {
  background: linear-gradient(90deg, #E8A84C, #5B9CF5);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tile-speakers {
  display: flex;
  gap: 1.2rem;
  margin: 0.75rem 0;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
}

.tile-speaker {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.tile-speaker-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.tile-speaker-dot.c1 {
  background: #E8A84C;
  box-shadow: 0 0 6px rgba(232, 168, 76, 0.3);
}

.tile-speaker-dot.c2 {
  background: #5B9CF5;
  box-shadow: 0 0 6px rgba(91, 156, 245, 0.3);
}

.tile-speaker-label.c1 { color: #E8A84C; }
.tile-speaker-label.c2 { color: #5B9CF5; }

.home-tile-featured .tile-link {
  background: linear-gradient(90deg, #E8A84C, #5B9CF5);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

footer .support-link a {
  color: var(--text-muted);
  text-decoration: none;
  opacity: 0.6;
  transition: opacity 0.2s;
}

footer .support-link a:hover {
  opacity: 1;
  color: var(--text);
}

/* ── 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: 1.25rem; }
  .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; }
  .home-intro { padding: 2rem 0 1.5rem; }
  .home-tile { padding: 2rem 0; }
  .tile-heading h2 { font-size: 1.05rem; }
  .tile-heading { flex-direction: column; gap: 0.25rem; }
  footer .container {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }
}