/* Portfolio site styles. Plain CSS, no build step, light and dark themes. */
:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --ink: #1d2320;
  --muted: #5b6660;
  --line: #dcdfd8;
  --accent: #1f7a4a;      /* vegetation green */
  --accent-ink: #ffffff;
  --accent-soft: #e3f1e8;
  --maroon: #500000;      /* Texas A&M */
  --chip: #eef0ea;
  --shadow: 0 1px 2px rgba(0,0,0,.05), 0 4px 16px rgba(0,0,0,.05);
  --radius: 14px;
  --max: 1080px;
  --mono: ui-monospace, "Cascadia Code", "JetBrains Mono", Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111513;
    --surface: #181d1a;
    --ink: #e7ece8;
    --muted: #9aa69f;
    --line: #2a322d;
    --accent: #5cc28a;
    --accent-ink: #0d1a12;
    --accent-soft: #1b2e23;
    --maroon: #c98b8b;
    --chip: #222924;
    --shadow: 0 1px 2px rgba(0,0,0,.4);
  }
}
:root[data-theme="dark"] {
  --bg: #111513;
  --surface: #181d1a;
  --ink: #e7ece8;
  --muted: #9aa69f;
  --line: #2a322d;
  --accent: #5cc28a;
  --accent-ink: #0d1a12;
  --accent-soft: #1b2e23;
  --maroon: #c98b8b;
  --chip: #222924;
  --shadow: 0 1px 2px rgba(0,0,0,.4);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
img { max-width: 100%; display: block; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }

/* Header */
.site-head {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-head .wrap { display: flex; align-items: center; gap: 16px; height: 58px; }
.brand { font-weight: 700; color: var(--ink); text-decoration: none; letter-spacing: -.01em; }
.brand span { color: var(--accent); font-family: var(--mono); font-weight: 500; }
.nav { margin-left: auto; display: flex; gap: 18px; flex-wrap: wrap; }
.nav a { color: var(--muted); text-decoration: none; font-size: 14.5px; }
.nav a:hover { color: var(--ink); }
@media (max-width: 720px) { .nav { display: none; } }

/* Hero */
.hero { padding: 64px 0 36px; }
.eyebrow { font-family: var(--mono); font-size: 13px; color: var(--accent); letter-spacing: .04em; }
.hero h1 { font-size: clamp(32px, 5vw, 50px); line-height: 1.08; margin: 10px 0 14px; letter-spacing: -.02em; }
.hero p.lead { font-size: 18.5px; color: var(--muted); max-width: 720px; margin: 0 0 22px; }
.btns { display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px; border-radius: 999px; font-size: 14.5px; font-weight: 600;
  text-decoration: none; border: 1px solid var(--line); color: var(--ink); background: var(--surface);
}
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

/* Stat strip */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 34px; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.stat b { display: block; font-size: 24px; letter-spacing: -.01em; }
.stat span { color: var(--muted); font-size: 13.5px; }
@media (max-width: 720px) { .stats { grid-template-columns: repeat(2, 1fr); } }

/* Sections */
section { padding: 40px 0; scroll-margin-top: 58px; }
section > .wrap > h2 { font-size: 26px; letter-spacing: -.01em; margin: 0 0 6px; }
.section-sub { color: var(--muted); margin: 0 0 24px; max-width: 760px; }

/* Project cards */
.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
@media (max-width: 820px) { .grid { grid-template-columns: 1fr; } }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column; box-shadow: var(--shadow);
}
.card .thumb { aspect-ratio: 16 / 9; background: var(--chip); border-bottom: 1px solid var(--line); overflow: hidden; }
.card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.card .body { padding: 18px 18px 20px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.card h3 { margin: 0; font-size: 19px; letter-spacing: -.01em; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card .result { color: var(--ink); font-size: 14.5px; background: var(--accent-soft); border-radius: 10px; padding: 9px 12px; }
.card .links { margin-top: auto; display: flex; gap: 14px; flex-wrap: wrap; font-size: 14.5px; font-weight: 600; }
.tags { display: flex; gap: 6px; flex-wrap: wrap; }
.tag { font-family: var(--mono); font-size: 12px; padding: 2px 8px; border-radius: 999px; background: var(--chip); color: var(--muted); }
.card.feature { grid-column: 1 / -1; }
.card.feature .inner { display: grid; grid-template-columns: 1.1fr 1fr; }
.card.feature .thumb { aspect-ratio: auto; border-bottom: 0; border-right: 1px solid var(--line); min-height: 260px; }
@media (max-width: 820px) {
  .card.feature .inner { grid-template-columns: 1fr; }
  .card.feature .thumb { border-right: 0; border-bottom: 1px solid var(--line); min-height: 0; aspect-ratio: 16 / 9; }
}

/* Skills */
.skills { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
@media (max-width: 820px) { .skills { grid-template-columns: 1fr; } }
.skill { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; }
.skill h3 { margin: 0 0 8px; font-size: 16px; }
.skill p { margin: 0; color: var(--muted); font-size: 14.5px; }

/* Certifications */
.cert-group h3 { font-size: 15px; font-family: var(--mono); color: var(--muted); font-weight: 500; letter-spacing: .03em; margin: 26px 0 10px; text-transform: uppercase; }
.certs { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.cert {
  display: grid; grid-template-columns: 1fr auto; gap: 4px 16px; align-items: baseline;
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px;
}
.cert b { font-weight: 600; }
.cert .who { color: var(--muted); font-size: 14px; grid-column: 1; }
.cert .when { font-family: var(--mono); font-size: 13px; color: var(--muted); grid-row: 1; grid-column: 2; white-space: nowrap; }
.badge { display: inline-block; font-size: 12px; font-weight: 600; padding: 1px 8px; border-radius: 999px; margin-left: 6px; vertical-align: 2px; }
.badge.done { background: var(--accent-soft); color: var(--accent); }
.badge.prog { background: #fff3d6; color: #8a5a00; }
.badge.plan { background: var(--chip); color: var(--muted); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .badge.prog { background: #3a2f12; color: #f0c56a; } }
:root[data-theme="dark"] .badge.prog { background: #3a2f12; color: #f0c56a; }
@media (max-width: 560px) { .cert { grid-template-columns: 1fr; } .cert .when { grid-row: auto; grid-column: 1; } }

/* Timeline (experience) */
.timeline { display: grid; gap: 14px; }
.tl { display: grid; grid-template-columns: 150px 1fr; gap: 16px; }
.tl .when { font-family: var(--mono); font-size: 13px; color: var(--muted); padding-top: 3px; }
.tl h3 { margin: 0; font-size: 16.5px; }
.tl p { margin: 4px 0 0; color: var(--muted); font-size: 15px; }
@media (max-width: 560px) { .tl { grid-template-columns: 1fr; gap: 2px; } }

/* Article pages */
.article { max-width: 760px; margin: 0 auto; padding: 40px 16px 60px; }
.article h1 { font-size: clamp(28px, 4.4vw, 42px); line-height: 1.12; letter-spacing: -.02em; margin: 8px 0 12px; }
.article h2 { font-size: 22px; margin: 34px 0 8px; }
.article p, .article li { font-size: 16.5px; }
.article figure { margin: 24px 0; }
.article figcaption { color: var(--muted); font-size: 14px; margin-top: 8px; }
.article table { border-collapse: collapse; width: 100%; font-size: 15px; margin: 12px 0; }
.article th, .article td { border-bottom: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
.article th { color: var(--muted); font-weight: 600; }
.note { border-left: 3px solid var(--accent); background: var(--accent-soft); padding: 10px 14px; border-radius: 0 10px 10px 0; font-size: 15px; }
code { font-family: var(--mono); font-size: .92em; background: var(--chip); padding: 1px 5px; border-radius: 5px; }

/* Footer */
.site-foot { border-top: 1px solid var(--line); padding: 26px 0 40px; color: var(--muted); font-size: 14px; }
.site-foot .wrap { display: flex; gap: 16px; flex-wrap: wrap; justify-content: space-between; }
.theme-toggle { background: none; border: 1px solid var(--line); color: var(--muted); border-radius: 999px; padding: 4px 12px; cursor: pointer; font: inherit; font-size: 13px; }