:root {
  --bg: #0b1020;
  --bg-elev: #0f172a;
  --text: #e5e7eb;
  --muted: #9aa3b2;
  --accent: #22d3ee;
  --card: #111827;
  --border: #223;
  --shadow: 0 10px 30px rgba(0,0,0,.25);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f8fafc;
    --bg-elev: #ffffff;
    --text: #0f172a;
    --muted: #475569;
    --accent: #0ea5e9;
    --card: #ffffff;
    --border: #e5e7eb;
    --shadow: 0 8px 24px rgba(2,6,23,.08);
  }
}

/* Explicit theme overrides so manual toggle wins over system preference */
[data-theme="light"] {
  --bg: #f8fafc;
  --bg-elev: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --accent: #0ea5e9;
  --card: #ffffff;
  --border: #e5e7eb;
  --shadow: 0 8px 24px rgba(2,6,23,.08);
}

[data-theme="dark"] {
  --bg: #0b1020;
  --bg-elev: #0f172a;
  --text: #e5e7eb;
  --muted: #9aa3b2;
  --accent: #22d3ee;
  --card: #111827;
  --border: #223;
  --shadow: 0 10px 30px rgba(0,0,0,.25);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
  text-rendering: optimizeLegibility;
}

:root, [data-theme="dark"] { color-scheme: dark; }
[data-theme="light"] { color-scheme: light; }

.skip-link {
  position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden;
}
.skip-link:focus { position: static; width: auto; height: auto; padding: 8px; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

.site-header { position: sticky; top: 0; z-index: 10; background: var(--bg-elev); border-bottom: 1px solid var(--border); backdrop-filter: saturate(180%) blur(8px); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { font-weight: 800; letter-spacing: .08em; color: var(--text); text-decoration: none; }
.nav a { color: var(--text); text-decoration: none; margin-left: 18px; opacity: .9; }
.nav a:hover { opacity: 1; }
.theme-toggle { margin-right: 8px; background: transparent; border: 1px solid var(--border); color: var(--text); border-radius: 8px; padding: 6px 8px; cursor: pointer; }

.hero { background: radial-gradient(1200px 600px at 20% -10%, rgba(34,211,238,.15), transparent), var(--bg); }
.hero-inner { display: grid; grid-template-columns: 1.2fr .8fr; gap: 32px; align-items: center; padding: 56px 0; }
.tagline { color: var(--muted); font-size: clamp(1rem, 1vw + .8rem, 1.25rem); margin-top: -8px; }
.bio { color: var(--muted); }
.hero-cta { margin-top: 18px; display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 10px 14px; border: 1px solid var(--border); color: var(--text); text-decoration: none; border-radius: 10px; }
.btn.primary { background: linear-gradient(135deg, var(--accent), #60a5fa); border-color: transparent; color: #001018; font-weight: 700; }
.meta { list-style: none; padding: 0; margin: 14px 0 0; display: flex; gap: 16px; color: var(--muted); }
.meta-item { display: inline-flex; align-items: center; gap: 6px; }
.hero-media img { border-radius: 18px; box-shadow: var(--shadow); width: 200px; height: 200px; object-fit: cover; background: var(--card); border: 1px solid var(--border); }

.section { padding: 56px 0; border-top: 1px solid var(--border); background: var(--bg); }
.chips { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 10px; }
.chip { background: var(--card); border: 1px solid var(--border); padding: 6px 10px; border-radius: 999px; color: var(--text); }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 16px; box-shadow: var(--shadow); display: flex; flex-direction: column; min-height: 160px; }
.card h3 { margin: 0 0 6px 0; font-size: 1.1rem; }
.card p { margin: 0 0 10px 0; color: var(--muted); }
.card .meta-row { margin-top: auto; display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: .9rem; }
.card a.more { text-decoration: none; font-weight: 600; }
.topics { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0; }
.topic { font-size: .75rem; padding: 4px 8px; border: 1px dashed var(--border); border-radius: 999px; color: var(--muted); }

.links { padding-left: 18px; }

.site-footer { border-top: 1px solid var(--border); padding: 26px 0; background: var(--bg-elev); }

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid { grid-template-columns: 1fr; }
}