/* === TOKENS === */
:root {
  --white: #FFFFFF;
  --off-white: #F8F7F4;
  --ink: #111111;
  --ink-muted: #555555;
  --ink-faint: #999999;
  --border: #E5E3DF;
  --accent: #1A56DB;       /* a single cool blue — precise, technical */
  --accent-hover: #1345BF;
  --tag-bg: #EEF2FF;
  --tag-color: #3B5BDB;
  --error-color: #C92A2A;
  --code-bg: #F3F4F6;

  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --max-w: 720px;
  --max-w-wide: 1080px;
  --nav-h: 60px;
}

/* === RESET === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--white);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* === NAV === */
.site-header {
  height: var(--nav-h);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  z-index: 100;
}
.nav-inner {
  max-width: var(--max-w-wide);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.nav-links {
  list-style: none;
  display: flex;
  gap: 32px;
}
.nav-links a {
  color: var(--ink-muted);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--ink); }

/* === MAIN + FOOTER === */
.main-content {
  flex: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 80px;
  padding: 24px;
  text-align: center;
}
.footer-inner {
  font-size: 0.8rem;
  color: var(--ink-faint);
}
.footer-inner a { color: var(--ink-faint); }

/* === HERO === */
.hero {
  padding: 80px 0 64px;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 20px;
}
.hero-sub {
  font-size: 1.05rem;
  color: var(--ink-muted);
  max-width: 540px;
  line-height: 1.7;
  margin-bottom: 32px;
}
.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* === BUTTONS === */
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s;
}
.btn-primary:hover { background: var(--accent-hover); text-decoration: none; }
.btn-ghost {
  display: inline-block;
  background: transparent;
  color: var(--ink-muted);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: 6px;
  border: 1px solid var(--border);
  cursor: pointer;
  text-decoration: none;
  transition: border-color 0.15s, color 0.15s;
}
.btn-ghost:hover { border-color: var(--ink-muted); color: var(--ink); text-decoration: none; }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-full { width: 100%; text-align: center; }

/* === SECTIONS === */
.section { padding: 48px 0; border-top: 1px solid var(--border); }
.section-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  margin-bottom: 28px;
}
.view-all {
  display: inline-block;
  margin-top: 24px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent);
}

/* === CARDS (projects) === */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.project-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  position: relative;
  transition: border-color 0.15s;
}
.project-card:hover { border-color: var(--accent); }
.project-card--featured { border-color: var(--accent); }
.featured-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: var(--tag-bg);
  padding: 2px 8px;
  border-radius: 99px;
}
.card-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--ink);
}
.card-desc {
  font-size: 0.875rem;
  color: var(--ink-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}
.card-links {
  display: flex;
  gap: 16px;
  margin-top: 16px;
}
.card-link {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
}

/* === TAGS === */
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background: var(--tag-bg);
  color: var(--tag-color);
  padding: 2px 8px;
  border-radius: 4px;
}
.tag-link { text-decoration: none; }
.tag-link:hover { background: #DDE5FF; text-decoration: none; }
.tag-active { background: var(--accent); color: #fff; }

/* === POST LIST === */
.post-list { display: flex; flex-direction: column; }
.post-row {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}
.post-row:first-child { border-top: 1px solid var(--border); }
.post-row-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 2px;
}
.post-date {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  white-space: nowrap;
}
.post-row-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  display: block;
  margin-bottom: 6px;
  text-decoration: none;
}
.post-row-title:hover { color: var(--accent); }
.post-row-summary {
  font-size: 0.875rem;
  color: var(--ink-muted);
  line-height: 1.6;
}

/* === PAGE HEADER === */
.page-header { padding: 64px 0 40px; }
.page-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}
.page-sub { font-size: 1rem; color: var(--ink-muted); max-width: 480px; }

/* === ARTICLE (prose) === */
.prose-article { padding: 64px 0; }
.article-header { margin-bottom: 48px; }
.article-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.article-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.article-summary {
  font-size: 1.1rem;
  color: var(--ink-muted);
  line-height: 1.7;
  border-left: 3px solid var(--border);
  padding-left: 16px;
}
.article-footer { margin-top: 64px; padding-top: 32px; border-top: 1px solid var(--border); }
.back-link { font-size: 0.875rem; font-weight: 500; color: var(--ink-muted); }
.back-link:hover { color: var(--ink); }

/* === PROSE CONTENT === */
.prose { font-size: 1.0rem; line-height: 1.8; color: var(--ink); }
.prose h1, .prose h2, .prose h3, .prose h4 {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
  margin-top: 2em;
  margin-bottom: 0.5em;
  color: var(--ink);
}
.prose h2 { font-size: 1.6rem; }
.prose h3 { font-size: 1.2rem; }
.prose p { margin-bottom: 1.25em; }
.prose a { color: var(--accent); }
.prose ul, .prose ol { padding-left: 1.5em; margin-bottom: 1.25em; }
.prose li { margin-bottom: 0.4em; }
.prose blockquote {
  border-left: 3px solid var(--border);
  padding-left: 16px;
  color: var(--ink-muted);
  margin: 1.5em 0;
}
.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
}
.prose pre {
  background: var(--off-white);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  overflow-x: auto;
  margin: 1.5em 0;
}
.prose pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.6;
}
.prose table { width: 100%; border-collapse: collapse; margin: 1.5em 0; font-size: 0.9rem; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.prose th { background: var(--off-white); font-weight: 600; }

/* === ERROR / EMPTY === */
.error-page { padding: 120px 0; text-align: center; }
.error-code { font-family: var(--font-mono); font-size: 0.875rem; color: var(--ink-faint); margin-bottom: 16px; }
.error-title { font-family: var(--font-display); font-size: 2.5rem; margin-bottom: 12px; }
.error-sub { color: var(--ink-muted); margin-bottom: 32px; }
.empty-state { color: var(--ink-faint); font-size: 0.9rem; padding: 32px 0; }

/* === ADMIN === */
.admin-body { background: var(--off-white); font-family: var(--font-body); }
.admin-wrap { max-width: 960px; margin: 0 auto; padding: 40px 24px; }
.admin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 40px;
}
.admin-title { font-size: 1.4rem; font-weight: 600; }
.admin-section { background: var(--white); border-radius: 10px; border: 1px solid var(--border); padding: 28px; margin-bottom: 24px; }
.admin-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.admin-section-head h2 { font-size: 1rem; font-weight: 600; }
.admin-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
.admin-table th { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--border); font-weight: 600; color: var(--ink-muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.04em; }
.admin-table td { padding: 10px 12px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.admin-table tr:last-child td { border-bottom: none; }
.status-badge { font-size: 0.72rem; padding: 2px 8px; border-radius: 99px; font-weight: 500; }
.status-live { background: #D3F9D8; color: #2B8A3E; }
.status-draft { background: #FFF3BF; color: #856B00; }
.action-cell { display: flex; gap: 12px; align-items: center; }
.action-link { font-size: 0.8rem; color: var(--accent); background: none; border: none; cursor: pointer; padding: 0; font-family: inherit; }
.action-delete { color: var(--error-color); }
.empty-cell { color: var(--ink-faint); text-align: center; padding: 24px; }

/* Admin form */
.admin-form { background: var(--white); border: 1px solid var(--border); border-radius: 10px; padding: 32px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.875rem; font-weight: 500; margin-bottom: 6px; }
.form-hint { font-weight: 400; color: var(--ink-faint); }
.form-group input[type="text"],
.form-group input[type="url"],
.form-group textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--ink);
  background: var(--white);
  transition: border-color 0.15s;
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.form-group textarea { font-family: var(--font-mono); font-size: 0.82rem; line-height: 1.6; resize: vertical; }
.form-checkbox { display: flex; align-items: center; gap: 10px; }
.form-checkbox input { width: auto; }
.form-checkbox label { margin-bottom: 0; }
.form-actions { display: flex; gap: 12px; margin-top: 28px; }
.form-error { background: #FFF5F5; border: 1px solid #FFCCCC; color: var(--error-color); padding: 10px 14px; border-radius: 6px; font-size: 0.875rem; margin-bottom: 16px; }

/* Login */
.login-wrap { max-width: 360px; margin: 80px auto; padding: 0 24px; }
.login-title { font-family: var(--font-display); font-size: 1.8rem; margin-bottom: 24px; }
.login-form { display: flex; flex-direction: column; gap: 14px; }
.login-form label { font-size: 0.875rem; font-weight: 500; display: block; margin-bottom: 4px; }
.login-form input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  font-family: var(--font-body);
  font-size: 0.9rem;
}
.login-form input:focus { outline: none; border-color: var(--accent); }

/* === RESPONSIVE === */
@media (max-width: 600px) {
  .post-row { grid-template-columns: 1fr; gap: 6px; }
  .post-row-meta { flex-direction: row; flex-wrap: wrap; }
  .card-grid { grid-template-columns: 1fr; }
  .hero { padding: 48px 0 40px; }
  .hero-actions { flex-direction: column; }
  .admin-table th:nth-child(3), .admin-table td:nth-child(3) { display: none; }
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}