/*
  Styles for Meet Pandya — GitHub Pages
  - Responsive, accessible, dark/light theme with system preference and toggle
  - Keep comments for maintainability per user rules
*/

:root {
  --bg: #0b0d10;
  --surface: #13161b;
  --text: #e6edf3;
  --muted: #9fb1c1;
  --brand: #5ac8fa;
  --accent: #9b59b6;
  --border: #26313a;
  --shadow: 0 10px 30px rgba(0,0,0,0.25);
}

/* Light theme variables */
[data-theme="light"] {
  --bg: #ffffff;
  --surface: #f6f8fa;
  --text: #0b0d10;
  --muted: #4b5563;
  --brand: #0070f3;
  --accent: #6f42c1;
  --border: #e5e7eb;
}

/* Respect system preference by default */
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --bg: #ffffff;
    --surface: #f6f8fa;
    --text: #0b0d10;
    --muted: #4b5563;
    --brand: #0070f3;
    --accent: #6f42c1;
    --border: #e5e7eb;
  }
}

/* Base reset */
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.skip-link:focus { left: 1rem; top: 1rem; width: auto; height: auto; padding: .5rem .75rem; background: var(--surface); border: 1px solid var(--border); border-radius: .4rem; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(8px);
  background: color-mix(in oklab, var(--bg) 85%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; justify-content: space-between; padding: .8rem 0; }
.brand { font-weight: 800; color: var(--text); border: 2px solid var(--border); padding: .25rem .5rem; border-radius: .5rem; }
.nav-links a { margin: 0 .6rem; color: var(--muted); }
.nav-links a:hover { color: var(--text); }
.theme-toggle { border: 1px solid var(--border); background: var(--surface); color: var(--text); padding: .4rem .6rem; border-radius: .5rem; cursor: pointer; }

/* Sections */
.section { padding: 3.5rem 0; }
.section.alt { background: var(--surface); }
.title { font-size: clamp(2rem, 3vw + 1rem, 3rem); margin: 0 0 .25rem; }
.subtitle { color: var(--muted); margin: 0 0 1rem; font-weight: 600; }
.lead { color: var(--muted); font-size: 1.05rem; }

.cta-row { margin-top: 1rem; display: flex; gap: .75rem; }
.button { display: inline-block; padding: .6rem 1rem; border-radius: .6rem; border: 1px solid var(--border); color: var(--text); background: transparent; }
.button.primary { background: linear-gradient(135deg, var(--brand), var(--accent)); color: white; border: none; box-shadow: var(--shadow); }
.button:hover { opacity: .9; text-decoration: none; }

.social { margin-top: .75rem; color: var(--muted); display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; }

.grid-two { display: grid; grid-template-columns: 1.2fr .8fr; gap: 2rem; align-items: start; }
@media (max-width: 900px) { .grid-two { grid-template-columns: 1fr; } }

.card { background: var(--bg); border: 1px solid var(--border); border-radius: 1rem; padding: 1rem; box-shadow: var(--shadow); }
.hero-card .card { position: sticky; top: 5.5rem; }
.facts { padding-left: 1.2rem; margin: .5rem 0 0; }
.facts li { margin: .25rem 0; }
.links-inline { margin-top: .75rem; display: flex; align-items: center; gap: .5rem; }
.inline-link { color: var(--brand); }

.badges { display: flex; flex-wrap: wrap; gap: .5rem; }
.badge { background: color-mix(in oklab, var(--brand) 18%, transparent); color: var(--text); border: 1px solid var(--border); padding: .35rem .6rem; border-radius: 999px; font-size: .9rem; }

.list { margin: .25rem 0 0; padding-left: 1.2rem; }
.experience { margin-top: .75rem; }
.experience-header { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.experience .meta { color: var(--muted); font-size: .95rem; }
.impact { margin-top: .75rem; font-weight: 600; color: var(--muted); }

.pubs { margin: .25rem 0 0; padding-left: 1.2rem; }

.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: .75rem; }
@media (max-width: 720px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-item { display: block; padding: .75rem 1rem; border: 1px solid var(--border); border-radius: .6rem; background: var(--bg); }

.site-footer { padding: 2rem 0; border-top: 1px solid var(--border); color: var(--muted); }