/* Ibrahim Mohamed — portfolio. Design tokens + components. */
:root {
  --bg: #FAFAF6;
  --ink: #16181A;
  --body: #3E4144;
  --muted: #63666A;
  --faint: #8B8E92;
  --line: #EBEBE5;
  --line2: #EFEFE9;
  --card: #FFFFFF;
  --chip: #F1F1EB;
  --green: #157A46;
  --green-dark: #0F5C34;
  --sans: 'Instrument Sans', -apple-system, sans-serif;
  --mono: 'IBM Plex Mono', monospace;
  --radius: 18px;
  --shadow-card: 0 1px 2px rgba(22,24,26,0.04);
  --shadow-hover: 0 16px 40px rgba(22,24,26,0.08);
  --pad-x: clamp(20px, 6vw, 80px);
  --trans: all 0.25s ease;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--sans); -webkit-font-smoothing: antialiased; line-height: 1.5; }
a { color: var(--green); text-decoration: none; }
a:hover { color: var(--green-dark); }
/* Smooth cross-fade between page navigations (supported browsers) */
@view-transition { navigation: auto; }
::view-transition-old(root), ::view-transition-new(root) { animation-duration: 180ms; }
@media (prefers-reduced-motion: reduce) {
  @view-transition { navigation: none; }
}
img { max-width: 100%; }

/* ---------- nav ---------- */
.site-nav { position: sticky; top: 0; z-index: 100; background: rgba(250,250,246,0.95); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line2); }
.site-nav .bar { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 16px var(--pad-x); }
.logo { font: 600 16px var(--mono); color: var(--green); white-space: nowrap; }
.logo .cursor { display: inline-block; width: 9px; height: 17px; background: var(--green); margin-left: 6px; vertical-align: -2px; animation: blink 1.1s step-end infinite; }
@keyframes blink { 0%, 55% { opacity: 1; } 56%, 100% { opacity: 0; } }
.nav-links { display: flex; align-items: center; gap: clamp(16px, 2.4vw, 34px); font: 500 15px var(--sans); }
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--ink); font-weight: 600; }
.btn-resume { color: var(--bg) !important; background: var(--ink); padding: 10px 20px; border-radius: 999px; font-weight: 600; }
.btn-resume:hover { background: var(--green); }
.burger { display: none; background: var(--card); border: 1px solid #E4E4DE; border-radius: 10px; padding: 9px 14px; cursor: pointer; font: 600 16px var(--mono); color: var(--ink); min-height: 44px; min-width: 48px; }
.mobile-menu { display: none; flex-direction: column; padding: 4px var(--pad-x) 20px; border-bottom: 1px solid var(--line2); background: var(--bg); box-shadow: 0 24px 48px rgba(22,24,26,0.10); }
.mobile-menu a { padding: 14px 0; border-bottom: 1px solid var(--line2); font: 500 17px var(--sans); color: var(--muted); }
.mobile-menu a.active { color: var(--ink); font-weight: 600; }
.mobile-menu .btn-resume { margin-top: 18px; align-self: flex-start; border-bottom: none; padding: 12px 24px; font-size: 15px; }
.site-nav.open .mobile-menu { display: flex; }
@media (max-width: 920px) {
  .nav-links { display: none; }
  .burger { display: inline-flex; align-items: center; justify-content: center; }
}

/* ---------- layout ---------- */
.container { max-width: 1000px; margin: 0 auto; width: 100%; padding: clamp(48px, 8vw, 88px) var(--pad-x) clamp(48px, 8vw, 96px); }
.container.wide { max-width: 1440px; }
.container.post { max-width: 1200px; padding-top: clamp(40px, 7vw, 64px); }
.label { font: 600 15px var(--mono); color: var(--green); margin: 0 0 24px; }
.eyebrow { font: 500 14px var(--mono); color: var(--green); margin: 0 0 18px; }
h1.page-title { margin: 0 0 20px; font: 600 clamp(34px, 6vw, 56px)/1.1 var(--sans); letter-spacing: -0.03em; }
.lede { margin: 0 0 64px; font: 400 19px/1.7 var(--sans); color: var(--muted); max-width: 680px; }
.section-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 28px; flex-wrap: wrap; gap: 8px; }
.section-head .label { margin: 0; }
.section-head a.more { font: 500 15px var(--sans); color: var(--muted); }
.section-head a.more:hover { color: var(--green); }

/* ---------- cards & grids ---------- */
.grid3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }
.grid3.tight { gap: 20px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow-card); display: flex; flex-direction: column; gap: 16px; color: inherit; transition: var(--trans); }
a.card:hover { border-color: var(--green); box-shadow: var(--shadow-hover); transform: translateY(-2px); color: inherit; }
.card .meta { font: 500 13px var(--mono); color: var(--green); }
.card h3 { margin: 0; font: 600 26px var(--sans); color: var(--ink); }
.card p { margin: 0; font: 400 15px/1.65 var(--sans); color: var(--muted); }
.card .cta { font: 500 14px var(--sans); color: var(--green); margin-top: auto; }
.chip { font: 500 12px var(--mono); color: var(--muted); background: var(--chip); padding: 5px 12px; border-radius: 999px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }

/* ---------- buttons ---------- */
.btn { display: inline-block; font: 600 16px var(--sans); padding: 14px 26px; border-radius: 999px; transition: var(--trans); }
.btn-green { background: var(--green); color: #fff; box-shadow: 0 8px 24px rgba(21,122,70,0.22); }
.btn-green:hover { background: var(--green-dark); color: #fff; }
.btn-dark { background: var(--ink); color: var(--bg); }
.btn-dark:hover { background: var(--green); color: var(--bg); }
.btn-ghost { border: 1px solid #E4E4DE; color: var(--ink); }
.btn-ghost:hover { border-color: var(--green); color: var(--green); }

/* ---------- split layouts (collapse at 900px) ---------- */
.split { display: grid; gap: clamp(40px, 6vw, 80px); }
.split.hero { grid-template-columns: 1fr 340px; align-items: center; }
.split.half { grid-template-columns: 1fr 1fr; }
.split.feature { grid-template-columns: 1fr 380px; gap: clamp(24px, 4vw, 48px); }
.split.article { grid-template-columns: 1fr 240px; gap: clamp(40px, 6vw, 72px); align-items: start; }
.side { border-left: 1px solid #E4E4DE; padding-left: 36px; }
@media (max-width: 900px) {
  .split.hero, .split.half, .split.feature, .split.article { grid-template-columns: 1fr; }
  .side { border-left: none; padding-left: 0; }
  .toc { position: static !important; }
}

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line2); padding: 24px var(--pad-x); display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; align-items: center; font: 400 13px var(--mono); color: var(--faint); margin-top: auto; }

/* ---------- prose (blog posts) ---------- */
.prose h2 { margin: 40px 0 16px; font: 600 28px/1.25 var(--sans); letter-spacing: -0.015em; }
.prose p { margin: 0 0 20px; font: 400 17px/1.8 var(--sans); color: var(--body); }
.prose li { font: 400 17px/1.7 var(--sans); color: var(--body); }
.prose pre { margin: 0 0 20px; background: var(--ink); color: #D7E2DA; border-radius: 14px; padding: 24px 28px; overflow-x: auto; font: 400 14px/1.7 var(--mono); }
.prose code.inline { font: 500 15px var(--mono); background: var(--chip); padding: 2px 8px; border-radius: 6px; color: var(--green); }
.prose blockquote { margin: 0 0 20px; padding: 20px 28px; border-left: 3px solid var(--green); background: #F3F6F2; border-radius: 0 12px 12px 0; font: italic 400 17px/1.7 var(--sans); color: var(--body); }
.toc { position: sticky; top: 96px; display: flex; flex-direction: column; gap: 4px; border-left: 1px solid #E4E4DE; padding-left: 24px; }
.toc .toc-title { font: 500 12px var(--mono); color: var(--faint); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 10px; }
.toc a { font: 400 14px/1.5 var(--sans); color: var(--muted); padding: 4px 0; }
.toc a:hover { color: var(--green); }
.toc .related { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--line); display: flex; flex-direction: column; gap: 10px; }
.toc .related a { font: 500 14px var(--sans); color: var(--green); }

/* ---------- misc ---------- */
.bullet-list { display: flex; flex-direction: column; gap: 14px; }
.bullet-list .b { position: relative; padding-left: 24px; font: 400 17px/1.7 var(--sans); color: var(--body); }
.bullet-list .b::before { content: "▸"; position: absolute; left: 0; top: 0; color: var(--green); font-family: var(--mono); }
:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; border-radius: 4px; }