/* ------------------------------------------------------------------
   Omer Arafat portfolio
   Apple-style dark: centered, oversized type, borderless surfaces,
   one accent (Electric Indigo). Motion is transform/opacity only.
   ------------------------------------------------------------------ */

:root {
  --bg: #0B0C10;
  --surface: #15161C;
  --surface-2: #1C1D24;
  --ink: #F5F5F7;
  --ink-2: #A1A1A6;
  --ink-3: #6E6E73;
  --line: rgba(255, 255, 255, 0.06);
  --indigo: #6366F1;
  --indigo-hover: #7A7CF5;
  --indigo-soft: rgba(99, 102, 241, 0.14);
  --indigo-glow: rgba(99, 102, 241, 0.4);
  --violet: #A855F7;
  --cyan: #22D3EE;
  --grad: linear-gradient(100deg, #22D3EE 0%, #818CF8 45%, #C084FC 100%);
  --radius: 28px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", sans-serif;
  --mono: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, monospace;
  --pad: clamp(1.25rem, 5vw, 4rem);
  --measure: 980px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; color-scheme: dark; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--sans); font-size: 17px; line-height: 1.5;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
h1, h2, h3, p { margin: 0; }
button { font: inherit; color: inherit; }
::selection { background: var(--indigo); color: #fff; }

#ambient { position: fixed; inset: 0; width: 100%; height: 100%; z-index: 0; pointer-events: none; }

/* Custom cursor: only for fine pointers, otherwise inert */
.cursor, #trail { display: none; }
@media (pointer: fine) and (prefers-reduced-motion: no-preference) {
  body.has-cursor, body.has-cursor a, body.has-cursor button, body.has-cursor input { cursor: none; }
  .cursor { display: block; position: fixed; top: 0; left: 0; z-index: 100; pointer-events: none; mix-blend-mode: difference; }
  .cursor-dot { position: absolute; width: 5px; height: 5px; margin: -2.5px 0 0 -2.5px; border-radius: 50%; background: #fff; transition: transform .25s var(--ease); }
  .cursor-ring { position: absolute; width: 32px; height: 32px; margin: -16px 0 0 -16px; border-radius: 50%; border: 1px solid rgba(255,255,255,.8); transition: transform .35s var(--ease), background .3s, border-color .3s, opacity .3s; }
  .cursor.is-link .cursor-ring { transform: scale(1.5); background: rgba(255,255,255,.14); border-color: transparent; }
  .cursor.is-link .cursor-dot { transform: scale(0); }
  .cursor.is-text .cursor-ring { transform: scale(0.3) scaleY(2.4); border-radius: 2px; }
  .cursor.is-down .cursor-ring { transform: scale(0.85); }
  .cursor.is-hidden { opacity: 0; }
  #trail { display: block; position: fixed; inset: 0; width: 100%; height: 100%; z-index: 99; pointer-events: none; }
}

/* Layout */
main { position: relative; z-index: 1; }
section { padding: clamp(6rem, 12vw, 11rem) var(--pad); max-width: var(--measure); margin: 0 auto; text-align: center; }

/* Nav: thin, blurred, centered, Apple-height */
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 50; height: 52px; transition: background .4s, border-color .4s; border-bottom: 1px solid transparent; }
.nav.is-scrolled { background: rgba(11,12,16,.72); backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px); border-color: var(--line); }
.nav-inner { max-width: var(--measure); margin: 0 auto; height: 100%; padding: 0 var(--pad); display: flex; align-items: center; justify-content: space-between; }
.nav-brand { font-weight: 600; font-size: 15px; letter-spacing: -0.01em; }
.nav-links { display: flex; gap: 2rem; }
.nav-links a { font-size: 13px; color: var(--ink-2); transition: color .3s; }
.nav-links a:hover, .nav-links a.is-active { color: var(--ink); }

/* Buttons and links */
.btn {
  position: relative; display: inline-flex; align-items: center; justify-content: center;
  height: 46px; padding: 0 1.5rem; border-radius: 999px; border: 0; overflow: hidden; isolation: isolate;
  background: linear-gradient(100deg, #6366F1, #A855F7); color: #fff; font-weight: 500; font-size: 16px; white-space: nowrap; box-shadow: 0 10px 30px -12px rgba(139,92,246,.6);
  transition: transform .35s var(--ease), background .3s, box-shadow .35s var(--ease); will-change: transform;
}
.btn span { position: relative; z-index: 1; }
.btn::before { content: ""; position: absolute; inset: 0; background: rgba(255,255,255,.14); transform: translateY(101%); transition: transform .5s var(--ease); }
.btn:hover::before, .btn:focus-visible::before { transform: translateY(0); }
.btn:hover { box-shadow: 0 18px 44px -14px rgba(139,92,246,.75); transform: translateY(-1px); }
.btn:active { transform: scale(0.97); }
.btn:focus-visible { outline: 2px solid var(--indigo); outline-offset: 3px; }
.link { display: inline-flex; align-items: center; gap: .15em; color: var(--cyan); font-size: 16px; font-weight: 500; }
.link i { font-style: normal; transition: transform .35s var(--ease); }
.link:hover { text-decoration: underline; text-underline-offset: 4px; }
.link:hover i { transform: translateX(3px); }

/* Typography */
.display { font-size: clamp(3rem, 9vw, 6.5rem); line-height: 1; letter-spacing: -0.045em; font-weight: 700; color: var(--ink); }
.h2 { font-size: clamp(2.2rem, 5.5vw, 3.75rem); line-height: 1.05; letter-spacing: -0.035em; font-weight: 700; }
.section-head { display: grid; gap: 1rem; margin-bottom: clamp(3rem, 6vw, 5rem); }
.section-head p { font-size: clamp(1.1rem, 1.6vw, 1.35rem); color: var(--ink-2); max-width: 44ch; margin: 0 auto; }
.section-head code { font-family: var(--mono); font-size: .85em; padding: .1em .45em; border-radius: 6px; background: rgba(34,211,238,.14); color: var(--cyan); }
.hero-sub { font-size: clamp(1.2rem, 2vw, 1.6rem); color: var(--ink-2); line-height: 1.4; letter-spacing: -0.01em; max-width: 46ch; margin: 0 auto; text-wrap: balance; }

.gradient-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; padding-bottom: .08em; margin-bottom: -.08em; }
.rise { opacity: 0; transform: translateY(30px); filter: blur(10px); transition: opacity 1.1s var(--ease), transform 1.1s var(--ease), filter 1.1s var(--ease); }
.rise.is-in { opacity: 1; transform: none; filter: blur(0); }

/* Split-text reveal */
.split .word { display: inline-block; overflow: hidden; vertical-align: top; padding-bottom: .1em; margin-bottom: -.1em; }
.split .char { display: inline-block; transform: translateY(110%); opacity: 0; will-change: transform, opacity; }
.split.is-in .char { animation: charUp 1s var(--ease) forwards; animation-delay: calc(var(--i) * 22ms); }
@keyframes charUp { to { transform: translateY(0); opacity: 1; } }
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 1s var(--ease), transform 1s var(--ease); transition-delay: var(--d, 0s); }
.reveal.is-in { opacity: 1; transform: none; }

/* Hero */
.hero { min-height: 100dvh; display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 1.5rem; padding-top: 5rem; position: relative; }
.hero::before { content: ""; position: absolute; left: 50%; top: 10%; width: 60vw; height: 50vh; transform: translateX(-50%); background: radial-gradient(closest-side, rgba(99,102,241,.28), transparent 70%); filter: blur(60px); pointer-events: none; z-index: -1; }
.hero::after { content: ""; position: absolute; left: 62%; top: 18%; width: 30vw; height: 30vh; background: radial-gradient(closest-side, rgba(34,211,238,.18), transparent 70%); filter: blur(60px); pointer-events: none; z-index: -1; }
.hero-actions { display: flex; align-items: center; gap: 1.75rem; flex-wrap: wrap; justify-content: center; margin-top: .5rem; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-top: clamp(3rem, 8vh, 6rem); width: 100%; background: var(--line); border-radius: var(--radius); overflow: hidden; }
.stat { background: var(--surface); padding: 2rem 1rem; display: grid; gap: .35rem; }
.stat b { font-size: clamp(2rem, 3.6vw, 3rem); font-weight: 700; letter-spacing: -0.04em; line-height: 1; font-variant-numeric: tabular-nums; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat span { color: var(--ink-3); font-size: 14px; }

/* About: statement typography */
.statement { font-size: clamp(1.5rem, 3.2vw, 2.4rem); line-height: 1.25; letter-spacing: -0.03em; font-weight: 600; color: var(--ink-2); max-width: 30ch; margin: 0 auto; }
.statement em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.statement-sub { margin: 2rem auto 0; font-size: clamp(1.05rem, 1.5vw, 1.25rem); color: var(--ink-3); max-width: 48ch; }
.stack { display: flex; flex-wrap: wrap; justify-content: center; gap: .6rem; margin-top: 3rem; }
.stack span { padding: .5rem 1rem; border-radius: 999px; background: var(--surface); border: 1px solid rgba(129,140,248,.18); color: var(--ink-2); font-size: 14px; font-weight: 500; transition: background .3s, color .3s; }
.stack span:hover { background: var(--surface-2); color: var(--ink); }

/* Work: borderless surfaces, 2+1 / 1+1+1 / 1+2 */
.work-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; text-align: left; }
.card-lg { grid-column: span 2; }
.card {
  position: relative; overflow: hidden; display: grid; grid-template-rows: auto auto 1fr auto; gap: .85rem; align-content: start;
  min-height: 300px; padding: 2.25rem; border-radius: var(--radius);
  --h: 240; --c1: hsl(var(--h) 90% 66% / .22); --c2: hsl(var(--h) 90% 66% / .16);
  background: radial-gradient(120% 90% at 0% 0%, var(--c1), transparent 60%), var(--surface);
  transform-style: preserve-3d; will-change: transform; --mx: 50%; --my: 50%;
  transition: background .4s, box-shadow .5s var(--ease);
}
.card:nth-child(2) { --h: 190; }
.card:nth-child(3) { --h: 280; }
.card:nth-child(4) { --h: 330; }
.card:nth-child(5) { --h: 160; }
.card:nth-child(6) { --h: 30; }
.card:nth-child(7) { --h: 210; }
.card::before { content: ""; position: absolute; inset: 0; border-radius: inherit; padding: 1px; pointer-events: none; z-index: 2;
  background: linear-gradient(135deg, hsl(var(--h) 90% 70% / .45), transparent 40%, transparent 60%, hsl(var(--h) 90% 70% / .2));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; }
.card::after { content: ""; position: absolute; inset: 0; pointer-events: none; border-radius: inherit; background: radial-gradient(520px circle at var(--mx) var(--my), var(--c2), transparent 55%); opacity: 0; transition: opacity .6s var(--ease); }
.card:hover { box-shadow: 0 30px 80px -30px hsl(var(--h) 90% 60% / .35); }
.card:hover::after { opacity: 1; }
.card > * { position: relative; z-index: 1; }
.card-kind { font-size: 13px; color: var(--ink-3); font-weight: 500; }
.card h3 { font-size: clamp(1.5rem, 2.2vw, 1.9rem); letter-spacing: -0.03em; line-height: 1.1; font-weight: 700; }
.card-lg h3 { font-size: clamp(2rem, 3.4vw, 2.75rem); }
.card p { color: var(--ink-2); font-size: 15px; max-width: 40ch; }
.card-lg p { max-width: 52ch; font-size: 17px; }
.tags { display: flex; flex-wrap: wrap; gap: .4rem; align-self: end; }
.tags span { padding: .3rem .7rem; border-radius: 999px; background: hsl(var(--h) 80% 70% / .1); color: hsl(var(--h) 60% 80%); font-size: 12px; font-weight: 500; }
.card-link { position: absolute; inset: 0; z-index: 3; }
.card-link:focus-visible { outline: 2px solid var(--indigo); outline-offset: -2px; border-radius: inherit; }
.card-arrow { position: absolute; top: 1.75rem; right: 1.75rem; z-index: 2; width: 36px; height: 36px; display: grid; place-items: center; border-radius: 999px; background: rgba(255,255,255,.06); color: var(--ink); font-size: 1.25rem; line-height: 1; padding-bottom: 3px; transition: background .3s, transform .5s var(--ease); }
.card:hover .card-arrow { background: hsl(var(--h) 90% 62%); color: #fff; transform: translateX(2px); }

/* Experience: centered column, glowing tracer */
.timeline { position: relative; max-width: 640px; margin: 0 auto; padding-left: 2.5rem; text-align: left; }
.timeline-svg { position: absolute; left: .5rem; top: 0; width: 2px; height: 100%; overflow: visible; }
.tl-base { stroke: var(--line); stroke-width: 2; }
.tl-fill, .tl-glow { stroke: url(#tlGrad); stroke-width: 2; stroke-dasharray: 1000; stroke-dashoffset: 1000; stroke-linecap: round; }
.tl-glow { stroke-width: 8; opacity: .3; filter: blur(6px); }
.milestones { list-style: none; margin: 0; padding: 0; display: grid; gap: clamp(2.5rem, 5vw, 3.5rem); }
.milestone { position: relative; display: grid; gap: .3rem; opacity: .4; transform: translateX(6px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.milestone.is-lit { opacity: 1; transform: none; }
.node { position: absolute; left: calc(-2.5rem + .5rem + 1px); top: .35rem; width: 10px; height: 10px; margin-left: -5px; border-radius: 50%; background: var(--bg); border: 2px solid var(--ink-3); transition: border-color .4s, background .4s, box-shadow .4s; }
.milestone.is-lit .node { border-color: var(--cyan); background: var(--cyan); box-shadow: 0 0 0 4px var(--indigo-soft), 0 0 20px var(--indigo-glow); }
.when { font-size: 13px; color: var(--ink-3); font-weight: 500; }
.milestone h3 { font-size: 1.2rem; letter-spacing: -0.02em; font-weight: 600; margin-top: .25rem; }
.org { color: var(--cyan); font-weight: 500; font-size: 15px; }
.milestone > p:last-child { color: var(--ink-2); font-size: 15px; margin-top: .4rem; }

/* Terminal */
.terminal { text-align: left; overflow: hidden; border-radius: var(--radius); background: var(--surface); font-family: var(--mono); font-size: 13.5px; transition: box-shadow .4s; }
.terminal:focus-within { box-shadow: 0 0 0 1px rgba(99,102,241,.5), 0 0 0 6px var(--indigo-soft); }
.term-bar { display: flex; align-items: center; gap: .45rem; padding: .9rem 1.25rem; border-bottom: 1px solid var(--line); }
.term-dot { width: 11px; height: 11px; border-radius: 50%; background: rgba(255,255,255,.12); }
.term-title { margin-left: auto; font-size: 12px; color: var(--ink-3); }
.term-body { min-height: 320px; max-height: 420px; overflow-y: auto; padding: 1.25rem 1.5rem; display: grid; align-content: start; gap: .25rem; scrollbar-width: thin; scrollbar-color: var(--ink-3) transparent; }
.term-line { white-space: pre-wrap; word-break: break-word; color: var(--ink-2); line-height: 1.6; }
.term-line.cmd { color: var(--ink); }
.term-line.cmd::before { content: "% "; color: var(--cyan); }
.term-line.accent { color: var(--indigo-hover); }
.term-line.err { color: #FF6B6B; }
.term-line a { color: var(--indigo-hover); text-decoration: underline; text-underline-offset: 3px; }
.term-input { display: flex; align-items: center; gap: .6rem; padding: .9rem 1.5rem; border-top: 1px solid var(--line); }
.prompt { color: var(--ink-2); white-space: nowrap; }
.prompt b { color: var(--violet); font-weight: 500; }
#termInput { flex: 1; min-width: 0; background: none; border: 0; outline: 0; color: var(--ink); font: inherit; caret-color: var(--indigo); }
#termInput::placeholder { color: var(--ink-3); }

/* Writing */
.posts { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; text-align: left; }
.post { position: relative; background: radial-gradient(100% 80% at 100% 0%, rgba(99,102,241,.14), transparent 60%), var(--surface); border-radius: var(--radius); padding: 2.25rem; display: grid; gap: .6rem; align-content: start; transition: background .4s; }
.post:hover { background: var(--surface-2); }
.post::after { content: "›"; position: absolute; top: 2rem; right: 2rem; font-size: 1.4rem; line-height: 1; color: var(--ink-3); transition: transform .4s var(--ease), color .3s; }
.post:hover::after { transform: translateX(4px); color: var(--cyan); }
.post h3 { font-size: 1.2rem; letter-spacing: -0.02em; font-weight: 600; padding-right: 2rem; line-height: 1.25; }
.post p { color: var(--ink-2); font-size: 15px; }

/* Contact */
.contact { display: grid; gap: 1.5rem; justify-items: center; }
.copy .copy-done { position: absolute; inset: 0; z-index: 1; display: grid; place-items: center; opacity: 0; transform: translateY(8px); transition: opacity .3s, transform .3s var(--ease); }
.copy.is-done { background: linear-gradient(100deg, #10B981, #22D3EE); }
.copy.is-done .copy-label { opacity: 0; }
.copy.is-done .copy-done { opacity: 1; transform: none; }
.socials { display: flex; gap: 2rem; flex-wrap: wrap; justify-content: center; }
.socials a { color: var(--ink-2); font-size: 15px; transition: color .3s; }
.socials a:hover { color: var(--ink); }

.footer { position: relative; z-index: 1; max-width: var(--measure); margin: 0 auto; padding: 2rem var(--pad); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; border-top: 1px solid var(--line); color: var(--ink-3); font-size: 12px; }

/* Responsive */
@media (max-width: 1024px) {
  .work-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .stats { grid-template-columns: 1fr 1fr; }
  .work-grid, .posts { grid-template-columns: 1fr; }
  .card-lg { grid-column: auto; }
  .card { min-height: 0; padding: 1.75rem; }
  .timeline { padding-left: 2rem; }
  .node { left: calc(-2rem + .5rem + 1px); }
  .hero-sub br { display: none; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .rise, .split .char { opacity: 1; transform: none; filter: none; transition: none; animation: none; }
  .milestone { opacity: 1; transform: none; }
  #ambient { display: none; }
}