/* SEBE site — redesigned March 2026 */
/* Self-hosted fonts, dark mode, 820px max-width */

/* ========== FONTS ========== */

@font-face {
  font-family: 'Source Serif 4';
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url('../fonts/source-serif-4-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Source Sans 3';
  font-style: normal;
  font-weight: 400 600;
  font-display: swap;
  src: url('../fonts/source-sans-3-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 400 500;
  font-display: swap;
  src: url('../fonts/jetbrains-mono-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ========== VARIABLES ========== */

:root {
  --ink: #1a1a1a;
  --paper: #f8f6f1;
  --accent: #2d5f2d;
  --accent-light: #e8f0e8;
  --muted: #6b6b6b;
  --border: #d4d0c8;
  --highlight: #c9a227;
  --tag-advanced: #8b4049;
  --serif: 'Source Serif 4', Georgia, serif;
  --sans: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', 'Consolas', monospace;
}

/* Dark mode: system preference OR manual override */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #d4d0c8;
    --paper: #1a1a1a;
    --accent: #5cb176;
    --accent-light: #1a2e1a;
    --muted: #999;
    --border: #333;
    --highlight: #c9a227;
    --tag-advanced: #c47a82;
    --timeline-opacity: 0.5;
  }
}

/* Manual dark override (light system preference) */
:root[data-theme="dark"] {
  --ink: #d4d0c8;
  --paper: #1a1a1a;
  --accent: #5cb176;
  --accent-light: #1a2e1a;
  --muted: #999;
  --border: #333;
  --highlight: #c9a227;
  --tag-advanced: #c47a82;
  --timeline-opacity: 0.5;
}

/* ========== RESET ========== */

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

/* ========== BASE ========== */

body {
  font-family: var(--sans);
  font-size: 1.125rem;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Scale up for high-DPI displays at native resolution */
@media (min-resolution: 144dpi) {
  body { font-size: 1.35rem; }
}
@media (min-resolution: 192dpi) {
  body { font-size: 1.5rem; }
}

/* ========== NAV ========== */

nav {
  max-width: 820px;
  margin: 0 auto;
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--border);
}

nav .site-name {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--accent);
  text-decoration: none;
}

nav .nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

nav .nav-links a {
  font-size: 0.85rem;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* Theme toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.2rem 0.5rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
  line-height: 1;
}

.theme-toggle:hover {
  color: var(--ink);
  border-color: var(--ink);
}

/* ========== MAIN ========== */

main {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ========== PROSE (articles, docs, posts) ========== */

.prose h1 {
  font-family: var(--serif);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

.prose h2 {
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
}

.prose h3 {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

.prose h4 {
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.4rem;
}

.prose p { margin-bottom: 1.2rem; }

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

.prose strong { font-weight: 700; }

.prose blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1.2rem;
  margin: 1.5rem 0;
  color: var(--muted);
  font-style: italic;
}

.prose ul, .prose ol {
  margin: 1rem 0 1.2rem 1.5rem;
}

.prose li { margin-bottom: 0.4rem; }

.prose img {
  max-width: 100%;
  height: auto;
  margin: 1.5rem 0;
}

.prose code {
  font-family: var(--mono);
  font-size: 0.88rem;
  background: var(--accent-light);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
}

.prose pre {
  background: var(--accent-light);
  padding: 1rem 1.2rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  border-radius: 3px;
  font-size: 0.88rem;
  line-height: 1.5;
}

.prose pre code {
  background: none;
  padding: 0;
}

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

/* ========== TABLES ========== */

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.92rem;
}

.prose th, .prose td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  text-align: left;
}

.prose th {
  font-weight: 600;
  background: rgba(0,0,0,0.03);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .prose th { background: rgba(255,255,255,0.05); }
}
:root[data-theme="dark"] .prose th { background: rgba(255,255,255,0.05); }

/* ========== HERO (landing page) ========== */

.hero {
  padding: 4rem 0 3rem;
  border-bottom: 1px solid var(--border);
}

.hero h1 {
  font-family: var(--serif);
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.2rem;
  max-width: 600px;
}

.hero .subtitle {
  font-size: 1.15rem;
  color: var(--muted);
  line-height: 1.7;
  max-width: 620px;
  margin-bottom: 1.8rem;
}

.hero .headline-number {
  font-family: var(--mono);
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--accent);
  padding: 1rem 1.4rem;
  background: var(--accent-light);
  border-left: 3px solid var(--accent);
  display: inline-block;
}

/* ========== AUTHOR LINE ========== */

.author-line {
  padding: 1.8rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.7;
}

.author-line strong {
  color: var(--ink);
  font-weight: 600;
}

/* ========== REVENUE TIMELINE ========== */

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

.numbers h2 {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.timeline {
  display: flex;
  align-items: flex-start;
  position: relative;
  padding-top: 0.5rem;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 2.2rem;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  opacity: var(--timeline-opacity, 0.3);
}

.timeline-item {
  flex: 1;
  position: relative;
  text-align: center;
}

.timeline-item::before {
  content: '';
  position: absolute;
  top: 1.65rem;
  left: 50%;
  transform: translateX(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  z-index: 1;
}

.timeline-item .big-num {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--accent);
  line-height: 1;
}

.timeline-item .num-label {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 1.2rem;
  line-height: 1.4;
}

/* ========== PATHWAY CARDS ========== */

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

.pathways h2 {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1.8rem;
}

.pathway-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1.5rem;
}

.pathway-card {
  padding: 1.5rem;
  border: 1px solid var(--border);
  background: #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.pathway-card:hover {
  border-color: var(--accent);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .pathway-card {
    background: #222220;
    box-shadow: none;
  }
  :root:not([data-theme="light"]) .pathway-card:hover {
    box-shadow: 0 2px 12px rgba(0,0,0,0.3);
  }
}
:root[data-theme="dark"] .pathway-card {
  background: #222220;
  box-shadow: none;
}
:root[data-theme="dark"] .pathway-card:hover {
  box-shadow: 0 2px 12px rgba(0,0,0,0.3);
}

.pathway-card .card-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.6rem;
}

.pathway-card h3 {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
  line-height: 1.3;
}

.pathway-card p {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.pathway-card .card-links {
  list-style: none;
}

.pathway-card .card-links li {
  margin-bottom: 0.35rem;
}

.pathway-card .card-links a {
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.pathway-card .card-links a:hover {
  border-bottom-color: var(--accent);
}

.pathway-card .card-links a::before {
  content: '\2192\00a0';
  font-family: var(--mono);
  font-size: 0.75rem;
}

/* ========== BLOG SECTION (landing page) ========== */

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

.blog-section h2 {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1.2rem;
}

.blog-entry {
  padding: 1rem 0;
  border-top: 1px solid var(--border);
}

.blog-entry:first-of-type { border-top: none; }

.blog-entry .blog-date {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
}

.blog-entry h3 {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0.3rem 0;
}

.blog-entry h3 a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.blog-entry h3 a:hover {
  border-bottom-color: var(--ink);
}

.blog-entry .blog-excerpt {
  font-size: 0.88rem;
  color: var(--muted);
}

/* ========== CTA SECTION ========== */

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

.cta-section h2 {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.8rem;
}

.cta-section p {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.7;
  max-width: 620px;
}

.cta-section p a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
}

/* ========== BLOG INDEX (blog.md) ========== */

.post-list {
  list-style: none;
  margin-left: 0;
}

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

.post-list li:last-child {
  border-bottom: none;
}

.post-list time {
  display: inline;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
}

.post-list a {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.post-list a:hover {
  border-bottom-color: var(--ink);
}

.post-list p {
  margin-top: 0.3rem;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

/* ========== ARTICLE (blog posts) ========== */

article time {
  display: block;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 2rem;
}

.author-bio {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--muted);
  font-style: italic;
}

.post-figure {
  margin: 1.5rem 0;
}

.post-figure img {
  max-width: 100%;
  height: auto;
  display: block;
  margin-bottom: 0;
}

.post-figure figcaption {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 0;
  padding-top: 0.4rem;
  border-top: 1px solid var(--border);
  letter-spacing: 0.03em;
  text-align: center;
}

/* ========== POST TAGS ========== */

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.post-tag {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  border: 1px solid var(--border);
  color: var(--muted);
  line-height: 1.4;
}

/* Level tags — filled backgrounds */
.post-tag-accessible {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.post-tag-intermediate {
  background: var(--highlight);
  border-color: var(--highlight);
  color: #1a1a1a;
}

.post-tag-advanced {
  background: var(--tag-advanced);
  border-color: var(--tag-advanced);
  color: #fff;
}

/* Blog index inline tags */
.post-list .post-tags {
  display: inline-flex;
  margin-bottom: 0;
  margin-left: 0.5rem;
  vertical-align: baseline;
}

/* ========== DOC LAYOUT ========== */

.doc-meta {
  padding: 2rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.doc-meta h1 {
  font-family: var(--serif);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.8rem;
}

.doc-meta .doc-details {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.7;
}

.doc-meta .doc-details span {
  margin-right: 1.5rem;
}

.doc-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
  font-style: italic;
}

/* ========== DOCUMENTS INDEX ========== */

.doc-list {
  list-style: none;
  margin-left: 0;
}

.doc-list li {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.doc-list li:last-child {
  border-bottom: none;
}

.doc-list a {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.doc-list a:hover {
  border-bottom-color: var(--ink);
}

.doc-list .doc-desc {
  margin-top: 0.3rem;
  font-size: 0.88rem;
  color: var(--muted);
}

/* ========== DOCUMENT FILTER ========== */

.doc-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.doc-filter-pill {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.3rem 0.8rem;
  border-radius: 3px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.doc-filter-pill:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.doc-filter-pill.active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--bg);
}

.doc-group-heading {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.8rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
  color: var(--ink);
}

/* Inline tags on doc index */
.doc-list .post-tags {
  display: inline-flex;
  margin-bottom: 0;
  margin-left: 0.5rem;
  vertical-align: baseline;
}

/* ========== GISCUS COMMENTS ========== */

.giscus-container {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

/* ========== FOOTER ========== */

footer {
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem;
  font-size: 0.78rem;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
}

footer a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

footer a:hover { border-bottom-color: var(--muted); }

/* ========== RESPONSIVE ========== */

@media (max-width: 680px) {
  .hero h1 { font-size: 1.8rem; }
  .hero .headline-number { font-size: 1.1rem; }

  nav {
    flex-direction: column;
    gap: 0.5rem;
  }

  footer {
    flex-direction: column;
    gap: 0.5rem;
  }

  .pathway-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .timeline { flex-wrap: wrap; }
  .timeline::before { display: none; }
  .timeline-item {
    flex: 0 0 50%;
    margin-bottom: 1.2rem;
  }
  .timeline-item::before { display: none; }
  .timeline-item .num-label { margin-top: 0.3rem; }
}