/* ==========================================================
   Styles for johnchood2.github.io
   Dark theme with a single steel-blue accent color.
   To re-theme the whole site, change the colors in :root.
   ========================================================== */

:root {
  --bg: #111317;
  --panel: #181b21;
  --code-bg: #0c0e11;
  --border: #262a31;
  --text: #e6e8eb;
  --text-muted: #9aa3ad;
  --accent: #7aa2c8;
  --accent-hover: #9bbad8;
  --radius: 8px;
  --content-width: 960px;
  --prose-width: 70ch;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, Menlo, monospace;
}

/* ---------- Base ---------- */

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

html { font-size: 17px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3, h4 { line-height: 1.25; font-weight: 600; margin: 1.6em 0 0.5em; }
h1 { font-size: 2rem; margin-top: 0; }
h2 { font-size: 1.45rem; }
h3 { font-size: 1.15rem; }
h4 { font-size: 1rem; }

img { max-width: 100%; height: auto; }

.container { max-width: var(--content-width); margin: 0 auto; padding: 0 1.25rem; }
main.container { padding-top: 2.5rem; padding-bottom: 4rem; }
.muted { color: var(--text-muted); }

/* ---------- Header and navigation ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.nav-bar { display: flex; align-items: center; justify-content: space-between; min-height: 3.5rem; }
.site-title { color: var(--text); font-weight: 600; }
.site-title:hover { color: var(--text); text-decoration: none; }

.nav-links { list-style: none; display: flex; gap: 1.25rem; margin: 0; padding: 0; }
.nav-links a { color: var(--text-muted); font-size: 0.9rem; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-links a.current { color: var(--text); border-bottom: 2px solid var(--accent); padding-bottom: 0.2rem; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: 0.35rem 0.6rem;
  cursor: pointer;
}

/* ---------- Footer ---------- */

.site-footer { border-top: 1px solid var(--border); color: var(--text-muted); font-size: 0.85rem; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; padding-top: 1.5rem; padding-bottom: 1.5rem; }
.footer-inner p { margin: 0; }

/* ---------- Shared pieces ---------- */

.page-header { margin-bottom: 2rem; }
.page-lead, .section-lead { color: var(--text-muted); margin-top: 0; }

.section { margin-top: 3rem; padding-top: 0.5rem; border-top: 1px solid var(--border); }
.section > h2 { margin-top: 1.5rem; }

.btn {
  display: inline-block;
  padding: 0.5rem 1.1rem;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--bg);
  font-size: 0.9rem;
  font-weight: 500;
}
.btn:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--bg); text-decoration: none; }
.btn-outline { background: transparent; color: var(--accent); }
.btn-outline:hover { background: transparent; color: var(--accent-hover); }

.social-icons { display: flex; gap: 1rem; font-size: 1.15rem; }
.social-icons a { color: var(--text-muted); }
.social-icons a:hover { color: var(--text); text-decoration: none; }

.tag-list { list-style: none; display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.5rem 0 0; padding: 0; }
.tag {
  display: inline-block;
  padding: 0.1rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 0.75rem;
}
a.tag:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.25rem; }
.card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.card-image { display: block; width: 100%; aspect-ratio: 16 / 10; object-fit: cover; background: var(--code-bg); }
.card-image.contain { object-fit: contain; padding: 1rem; }
.card-body { display: flex; flex: 1; flex-direction: column; gap: 0.5rem; padding: 1rem 1.1rem 1.25rem; }
.card-body h3 { margin: 0; }
.card-body p { margin: 0; color: var(--text-muted); font-size: 0.92rem; }
.card-link { margin-top: auto; font-size: 0.9rem; }

.panel { padding: 1.25rem; background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); }
.panel > :first-child { margin-top: 0; }

.caption { color: var(--text-muted); font-size: 0.85rem; font-style: italic; }

.link-list { list-style: none; margin: 0; padding: 0; }
.link-list li { padding: 0.55rem 0; border-bottom: 1px solid var(--border); }
.link-list li:last-child { border-bottom: 0; }
.link-list .meta { display: block; color: var(--text-muted); font-size: 0.85rem; }

.two-col { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; align-items: start; }
.grid-2 { display: grid; grid-template-columns: 1.6fr 1fr; gap: 2rem; align-items: start; }

/* ---------- Home page ---------- */

.hero { display: flex; gap: 2rem; align-items: center; padding: 1rem 0; }
.hero-photo { flex-shrink: 0; width: 160px; height: 160px; object-fit: cover; border: 1px solid var(--border); border-radius: 50%; }
.hero h1 { margin-bottom: 0.3rem; }
.hero-lead { margin: 0 0 1.25rem; color: var(--text-muted); }
.hero-links { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: 1.25rem; }

/* ---------- Research page ---------- */

.feature { display: grid; grid-template-columns: 1fr 1.4fr; gap: 2rem; align-items: start; padding: 2rem 0; border-bottom: 1px solid var(--border); }
.feature:last-of-type { border-bottom: 0; }
.feature img { border: 1px solid var(--border); border-radius: var(--radius); }
.feature h2 { margin-top: 0; scroll-margin-top: 4.5rem; }

/* ---------- CV page ---------- */

.cv-list { margin: 0 0 1rem; }
.cv-row { display: grid; grid-template-columns: 9rem 1fr; gap: 1rem; padding: 0.6rem 0; border-bottom: 1px solid var(--border); }
.cv-row:last-child { border-bottom: 0; }
.cv-date { color: var(--text-muted); font-size: 0.9rem; font-variant-numeric: tabular-nums; }

/* ---------- Notes ---------- */

.prose { max-width: var(--prose-width); }

.post-list { list-style: none; margin: 0; padding: 0; }
.post-list > li { padding: 1.1rem 0; border-bottom: 1px solid var(--border); }
.post-link { font-size: 1.1rem; font-weight: 600; }
.post-meta { margin: 0.2rem 0 0; color: var(--text-muted); font-size: 0.85rem; }
.post-description { margin: 0.35rem 0 0; }

.post-back { margin: 0 0 1rem; font-size: 0.9rem; }
.post-header { margin-bottom: 2rem; }
.post-header h1 { margin-bottom: 0.4rem; }
.post img { border-radius: var(--radius); }
.post blockquote { margin: 1.5rem 0; padding: 0.2rem 1rem; border-left: 3px solid var(--accent); color: var(--text-muted); }
.post table { width: 100%; border-collapse: collapse; }
.post th, .post td { padding: 0.4rem 0.7rem; border: 1px solid var(--border); text-align: left; }

.tag-section h2 { scroll-margin-top: 4.5rem; }
.tag-count { color: var(--text-muted); font-size: 1rem; font-weight: 400; }

/* ---------- Code ---------- */

code, pre { font-family: var(--font-mono); font-size: 0.85rem; }
:not(pre) > code { padding: 0.1rem 0.35rem; background: var(--panel); border: 1px solid var(--border); border-radius: 4px; }
pre { overflow-x: auto; padding: 1rem; line-height: 1.5; background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius); }

/* Syntax highlighting colors (Rouge) */
.highlight .c, .highlight .c1, .highlight .cm, .highlight .cs { color: #6b7380; font-style: italic; }
.highlight .k, .highlight .kd, .highlight .kn, .highlight .kr, .highlight .kc, .highlight .ow { color: #9d8cc9; }
.highlight .s, .highlight .s1, .highlight .s2, .highlight .sb, .highlight .sd, .highlight .si { color: #9cbf8a; }
.highlight .m, .highlight .mi, .highlight .mf { color: #d4a857; }
.highlight .nf, .highlight .fm { color: #7aa2c8; }
.highlight .nc, .highlight .nn { color: #7fb5b5; }
.highlight .nb, .highlight .bp { color: #c49a7a; }
.highlight .o, .highlight .p { color: #b8bfc7; }

/* ---------- Small screens ---------- */

@media (max-width: 760px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 3.5rem;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 1.25rem 1rem;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
  }
  .nav-links.open { display: flex; }
  .nav-links a { display: block; padding: 0.5rem 0; font-size: 1rem; }
  .nav-links a.current { border-bottom: 0; color: var(--accent); }

  .hero { flex-direction: column; text-align: center; }
  .hero-links, .hero .social-icons { justify-content: center; }
  .feature, .two-col, .grid-2 { grid-template-columns: 1fr; }
  .cv-row { grid-template-columns: 1fr; gap: 0.1rem; }
  .footer-inner { flex-direction: column; gap: 0.75rem; }
}