/* ==========================================================================
   Hadi Darwish — portfolio
   Visual world: the release log. Cool paper white, near-black ink, hairline
   rules, and one signal orange reserved for "now". Career drawn as a
   branch graph: parallel lanes are roles that overlapped.
   Tokens are documented in DESIGN.md.
   ========================================================================== */

@font-face {
  font-family: "Schibsted Grotesk";
  src: url("/assets/fonts/schibsted-grotesk-latin-wght-normal.woff2") format("woff2");
  font-weight: 400 900; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Schibsted Grotesk";
  src: url("/assets/fonts/schibsted-grotesk-latin-wght-italic.woff2") format("woff2");
  font-weight: 400 900; font-style: italic; font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("/assets/fonts/jetbrains-mono-latin-400-normal.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("/assets/fonts/jetbrains-mono-latin-500-normal.woff2") format("woff2");
  font-weight: 500; font-style: normal; font-display: swap;
}

/* ---------- Tokens ---------- */
:root {
  --bg:          oklch(0.985 0.003 250);
  --surface:     oklch(0.96 0.006 250);
  --ink:         oklch(0.22 0.02 262);
  --ink-2:       oklch(0.44 0.02 262);
  --ink-3:       oklch(0.53 0.018 262);
  --rule:        oklch(0.89 0.008 262);
  --rule-strong: oklch(0.22 0.02 262);
  --signal:      oklch(0.62 0.19 38);   /* bars, dots: non-text */
  --signal-text: oklch(0.53 0.18 36);   /* signal as text, 5.5:1 */
  --bar:         oklch(0.3 0.02 262);
  --bar-soft:    oklch(0.8 0.012 262);
  --on-ink:      oklch(0.985 0.003 250);
  --now:         oklch(0.53 0.18 36);
  --on-now:      oklch(0.99 0.003 250);
  --shadow:      0 1px 2px oklch(0.2 0.02 262 / 0.08), 0 8px 20px -10px oklch(0.2 0.02 262 / 0.25);

  --font-sans: "Schibsted Grotesk", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --step--1: clamp(0.84rem, 0.82rem + 0.1vw, 0.9rem);
  --step-0:  clamp(1.02rem, 0.98rem + 0.2vw, 1.12rem);
  --step-1:  clamp(1.2rem, 1.1rem + 0.45vw, 1.45rem);
  --step-2:  clamp(1.5rem, 1.3rem + 0.9vw, 2rem);
  --step-3:  clamp(2rem, 1.6rem + 1.8vw, 3rem);
  --step-4:  clamp(2.6rem, 1.8rem + 3.8vw, 5.2rem);

  --s-1: 0.25rem; --s-2: 0.5rem; --s-3: 0.75rem; --s-4: 1rem; --s-5: 1.5rem;
  --s-6: 2rem; --s-7: 3rem; --s-8: 4.5rem; --s-9: 7rem;
  --gutter: clamp(1rem, 0.5rem + 2.6vw, 3rem);
  --max: 74rem;
  --radius: 6px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:          oklch(0.17 0.012 262);
    --surface:     oklch(0.21 0.014 262);
    --ink:         oklch(0.95 0.005 250);
    --ink-2:       oklch(0.8 0.012 255);
    --ink-3:       oklch(0.7 0.014 258);
    --rule:        oklch(0.3 0.014 262);
    --rule-strong: oklch(0.95 0.005 250);
    --signal:      oklch(0.72 0.17 45);
    --signal-text: oklch(0.76 0.15 48);
    --bar:         oklch(0.86 0.01 255);
    --bar-soft:    oklch(0.42 0.015 262);
    --on-ink:      oklch(0.17 0.012 262);
    --now:         oklch(0.72 0.17 45);
    --on-now:      oklch(0.17 0.012 262);
    --shadow:      0 1px 2px oklch(0 0 0 / 0.3), 0 8px 20px -10px oklch(0 0 0 / 0.6);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg:          oklch(0.17 0.012 262);
  --surface:     oklch(0.21 0.014 262);
  --ink:         oklch(0.95 0.005 250);
  --ink-2:       oklch(0.8 0.012 255);
  --ink-3:       oklch(0.7 0.014 258);
  --rule:        oklch(0.3 0.014 262);
  --rule-strong: oklch(0.95 0.005 250);
  --signal:      oklch(0.72 0.17 45);
  --signal-text: oklch(0.76 0.15 48);
  --bar:         oklch(0.86 0.01 255);
  --bar-soft:    oklch(0.42 0.015 262);
  --on-ink:      oklch(0.17 0.012 262);
  --now:         oklch(0.72 0.17 45);
  --on-now:      oklch(0.17 0.012 262);
  --shadow:      0 1px 2px oklch(0 0 0 / 0.3), 0 8px 20px -10px oklch(0 0 0 / 0.6);
  color-scheme: dark;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 5rem; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  font-kerning: normal;
}
::selection { background: var(--now); color: var(--on-now); }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; border-radius: 3px; }
html { scrollbar-color: var(--ink-3) var(--bg); scrollbar-width: thin; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--rule); border: 2px solid var(--bg); border-radius: 10px; }
input, textarea { caret-color: var(--signal); }
h1, h2, h3 { margin: 0; text-wrap: balance; }
p { margin: 0; text-wrap: pretty; }
ul, ol, dl, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.22em; }
time, .mono { font-variant-numeric: tabular-nums; }
[hidden] { display: none !important; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.icon { width: 1em; height: 1em; flex: none; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.wrap { max-width: var(--max); margin-inline: auto; padding-inline: var(--gutter); }

.skip {
  position: absolute; left: var(--gutter); top: -3rem; z-index: 20;
  background: var(--ink); color: var(--on-ink); padding: var(--s-2) var(--s-4); border-radius: var(--radius);
  font-size: var(--step--1); text-decoration: none;
}
.skip:focus { top: var(--s-3); }

/* ---------- Top bar ---------- */
.bar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: var(--s-5);
  padding: var(--s-3) var(--gutter);
  background: color-mix(in oklch, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.3) blur(12px);
  -webkit-backdrop-filter: saturate(1.3) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease-out);
}
.bar.is-scrolled { border-bottom-color: var(--rule); }
.bar__name { font-weight: 700; letter-spacing: -0.01em; text-decoration: none; margin-right: auto; white-space: nowrap; }
.bar__nav { display: flex; gap: var(--s-5); font-size: var(--step--1); }
.bar__nav a { color: var(--ink-2); text-decoration: none; padding-block: var(--s-2); }
.bar__nav a:hover { color: var(--ink); text-decoration: underline; }
.theme-toggle {
  display: inline-grid; place-items: center; width: 2.5rem; height: 2.5rem; margin-right: calc(var(--s-2) * -1);
  border: 0; border-radius: 50%; background: transparent; color: var(--ink-2); cursor: pointer; font-size: 1.05rem;
}
.theme-toggle:hover { color: var(--ink); background: var(--surface); }
.theme-toggle .icon--sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon--sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon--moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon--sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon--moon { display: none; }
}
@media (max-width: 40rem) {
  .bar__nav { gap: var(--s-4); }
  .bar__nav li:nth-child(3) { display: none; }
}
@media (max-width: 26rem) {
  .bar__nav li:nth-child(2) { display: none; }
}

/* ---------- Hero ---------- */
.hero { padding-block: var(--s-8) var(--s-8); }
.hero__now {
  display: inline-flex; align-items: center; gap: 0.6em;
  font-size: var(--step--1); color: var(--ink-2);
}
.dot { width: 0.55rem; height: 0.55rem; border-radius: 50%; background: var(--signal); box-shadow: 0 0 0 4px color-mix(in oklch, var(--signal) 22%, transparent); }
.hero__title {
  margin-top: var(--s-5);
  max-width: 16ch;
  font-size: var(--step-4);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.035em;
}
.hero__lede { margin-top: var(--s-5); max-width: 56ch; font-size: var(--step-1); line-height: 1.45; color: var(--ink-2); }
.hero__links { display: flex; flex-wrap: wrap; gap: var(--s-3); margin-top: var(--s-6); }

.btn {
  display: inline-flex; align-items: center; gap: 0.5em;
  min-height: 2.9rem; padding: 0 1.2rem;
  font-size: 0.95rem; font-weight: 600;
  color: var(--ink); text-decoration: none;
  border: 1px solid var(--rule); border-radius: 999px;
  background: var(--bg);
  transition: border-color 0.2s var(--ease-out), background-color 0.2s var(--ease-out), color 0.2s var(--ease-out);
}
.btn:hover { border-color: var(--ink); }
.btn--solid { background: var(--ink); border-color: var(--ink); color: var(--on-ink); }
.btn--solid:hover { background: var(--now); border-color: var(--now); color: var(--on-now); }

/* ---------- Branch graph (signature) ---------- */
.graph { margin: var(--s-8) 0 0; }
.graph__plot {
  --lanes: 4;
  position: relative;
  padding-top: 1.9rem; /* room for year ticks */
  border-top: 1px solid var(--rule-strong);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}
.graph__ticks { position: absolute; inset: 0 0 0 0; pointer-events: none; }
.graph__tick {
  position: absolute; top: 0; bottom: 0; width: 0;
  border-left: 1px dashed var(--rule);
}
.graph__tick span { position: absolute; top: 0.45rem; left: 0.4rem; color: var(--ink-3); }
.graph__now { border-left: 1px solid var(--signal); }
.graph__now span { color: var(--signal-text); font-weight: 500; left: auto; right: 0.4rem; }
.graph__lane { position: relative; height: 2.2rem; margin-bottom: 0.45rem; }
.graph__lane--learn { height: 1.6rem; margin-top: 0.4rem; }
.graph__bar {
  position: absolute; top: 0; bottom: 0;
  display: flex; align-items: center; gap: 0.5em;
  padding: 0 0.6rem;
  border-radius: 999px;
  background: var(--bar);
  color: var(--on-ink);
  text-decoration: none;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  transform-origin: left center;
  transition: background-color 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out);
}
.graph__bar:hover, .graph__bar:focus-visible, .graph__bar.is-linked { box-shadow: var(--shadow); background: var(--ink); }
.graph__bar--now { background: var(--now); color: var(--on-now); }
.graph__bar--now:hover, .graph__bar--now.is-linked { background: var(--now); filter: saturate(1.15); }
.graph__bar--learn {
  background: transparent; color: var(--ink-2);
  border: 1px dashed var(--ink-3);
}
.graph__bar--learn:hover, .graph__bar--learn.is-linked { background-color: var(--surface); color: var(--ink); box-shadow: none; }
.graph__label { overflow: hidden; text-overflow: ellipsis; }
.graph__legend { display: flex; flex-wrap: wrap; gap: var(--s-2) var(--s-5); margin-top: var(--s-3); font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-3); }
.graph__legend span { display: inline-flex; align-items: center; gap: 0.5em; }
.graph__legend i { display: inline-block; width: 1.4rem; height: 0.6rem; border-radius: 999px; background: var(--bar); }
.graph__legend i.now { background: var(--now); }
.graph__legend i.learn { background: transparent; border: 1px dashed var(--ink-3); }
.graph__caption { margin-top: var(--s-2); font-size: var(--step--1); color: var(--ink-3); }

/* The authored moment: branches draw in, oldest first, like a history being replayed. */
.graph.is-drawing .graph__bar { animation: grow 0.9s var(--ease-out) both; animation-delay: calc(var(--order) * 90ms + 150ms); }
@keyframes grow { from { transform: scaleX(0.02); opacity: 0.4; } to { transform: scaleX(1); opacity: 1; } }

@media (max-width: 40rem) {
  .graph__plot { font-size: 0.66rem; }
  .graph__bar { padding: 0 0.45rem; }
}

/* ---------- Quote ---------- */
.quote { padding-block: var(--s-7) var(--s-8); }
.quote__text { margin: 0; }
.quote__text p { max-width: 24ch; font-size: var(--step-3); font-weight: 600; line-height: 1.3; letter-spacing: -0.025em; }
.quote__text p::before { content: "“"; color: var(--signal); margin-left: -0.45em; margin-right: 0.05em; }
@media (max-width: 40rem) { .quote__text p::before { margin-left: 0; } }

/* ---------- Sections ---------- */
.section {
  display: grid;
  grid-template-columns: minmax(0, 14rem) minmax(0, 1fr);
  gap: var(--s-5) var(--s-8);
  padding-block: var(--s-8);
  border-top: 1px solid var(--rule);
}
.section__title { font-size: var(--step-2); font-weight: 700; letter-spacing: -0.02em; line-height: 1.15; position: sticky; top: 5rem; align-self: start; }
@media (max-width: 52rem) {
  .section { grid-template-columns: 1fr; gap: var(--s-6); }
  .section__title { position: static; }
}

/* Experience log */
.log { display: grid; }
.entry {
  display: grid; grid-template-columns: minmax(0, 10rem) minmax(0, 1fr); gap: var(--s-2) var(--s-6);
  padding-block: var(--s-6);
  border-bottom: 1px solid var(--rule);
  scroll-margin-top: 6rem;
  transition: background-color 0.3s var(--ease-out);
}
.entry:first-child { padding-top: 0; }
.entry:last-child { border-bottom: 0; }
.entry.is-linked .entry__role { text-decoration: underline; text-decoration-color: var(--signal); text-decoration-thickness: 2px; text-underline-offset: 0.25em; }
.entry__when { font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink-3); padding-top: 0.3em; }
.entry:first-child .entry__when { color: var(--signal-text); }
.entry__role { font-size: var(--step-1); font-weight: 700; letter-spacing: -0.01em; line-height: 1.3; }
.entry__org { display: block; font-weight: 400; color: var(--ink-2); font-size: var(--step-0); margin-top: 0.15rem; }
.entry__points { margin-top: var(--s-4); display: grid; gap: var(--s-2); max-width: 68ch; color: var(--ink-2); }
.entry__points li { position: relative; padding-left: 1.1rem; }
.entry__points li::before { content: ""; position: absolute; left: 0; top: 0.72em; width: 0.45rem; height: 1px; background: var(--ink-3); }
@media (max-width: 40rem) { .entry { grid-template-columns: 1fr; } }

/* Projects */
.projects { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-7); }
.project { padding-top: var(--s-4); border-top: 2px solid var(--rule-strong); }
.project__when { font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink-3); }
.project__name { margin-top: var(--s-2); font-size: var(--step-2); font-weight: 800; letter-spacing: -0.025em; line-height: 1.1; }
.project__name a { display: inline-flex; align-items: center; gap: 0.3em; text-decoration: none; }
.project__name a .icon { font-size: 0.6em; color: var(--ink-3); transition: transform 0.25s var(--ease-out), color 0.25s var(--ease-out); }
.project__name a:hover .icon { transform: translate(2px, -2px); color: var(--signal-text); }
.project__what { margin-top: var(--s-3); color: var(--ink-2); max-width: 46ch; }
.project__stack { margin-top: var(--s-4); display: grid; gap: var(--s-1); font-size: var(--step--1); }
.project__stack div { display: grid; grid-template-columns: 6rem 1fr; gap: var(--s-3); }
.project__stack dt { font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-3); padding-top: 0.1em; }
@media (max-width: 40rem) { .projects { grid-template-columns: 1fr; gap: var(--s-6); } }

.repos { grid-column: 2; margin-top: var(--s-7); }
@media (max-width: 52rem) { .repos { grid-column: 1; } }
.repos__head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: var(--s-3); padding-bottom: var(--s-3); border-bottom: 1px solid var(--rule); }
.repos__title { font-size: var(--step-0); font-weight: 700; }
.repos__list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: var(--s-7); }
.repo { border-bottom: 1px solid var(--rule); }
.repo a { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: var(--s-1) var(--s-3); padding: var(--s-3) 0; text-decoration: none; }
.repo__name { font-weight: 600; }
.repo__lang { font-family: var(--font-mono); font-size: 0.75rem; color: var(--ink-3); align-self: center; }
.repo__desc { grid-column: 1 / -1; font-size: var(--step--1); color: var(--ink-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.repo a:hover .repo__name { text-decoration: underline; }
.repo--loading { height: 3.6rem; margin-top: var(--s-2); border: 0; border-radius: var(--radius); background: linear-gradient(90deg, var(--surface), color-mix(in oklch, var(--surface) 30%, var(--bg)), var(--surface)); background-size: 200% 100%; animation: shimmer 1.6s linear infinite; }
@keyframes shimmer { to { background-position: -200% 0; } }
.repos__error { grid-column: 1 / -1; padding-block: var(--s-4); color: var(--ink-2); }
@media (max-width: 40rem) { .repos__list { grid-template-columns: 1fr; } }
.link { display: inline-flex; align-items: center; gap: 0.35em; font-size: var(--step--1); font-weight: 600; }
.link:hover { color: var(--signal-text); }

/* Skills */
.skills__row { display: grid; grid-template-columns: minmax(0, 10rem) minmax(0, 1fr); gap: var(--s-1) var(--s-6); padding-block: var(--s-4); border-bottom: 1px solid var(--rule); }
.skills__row:first-child { padding-top: 0; }
.skills__row:last-child { border-bottom: 0; }
.skills__row dt { font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink-3); padding-top: 0.2em; }
.skills__row dd { max-width: 60ch; }
@media (max-width: 40rem) { .skills__row { grid-template-columns: 1fr; } }

/* Education & training */
.learn { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-6) var(--s-7); }
.learn__when { font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink-3); }
.learn__name { margin-top: var(--s-2); font-size: var(--step-0); font-weight: 700; line-height: 1.35; }
.learn__org { display: block; font-weight: 400; color: var(--ink-2); }
.learn__what { margin-top: var(--s-2); font-size: var(--step--1); color: var(--ink-2); max-width: 48ch; }
@media (max-width: 40rem) { .learn { grid-template-columns: 1fr; } }

/* ---------- Contact ---------- */
.contact { padding-block: var(--s-9); border-top: 1px solid var(--rule); }
.contact__title { font-size: var(--step-4); font-weight: 800; letter-spacing: -0.035em; line-height: 1; max-width: 14ch; }
.contact__lede { margin-top: var(--s-5); max-width: 48ch; font-size: var(--step-1); color: var(--ink-2); line-height: 1.45; }
.contact__email { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-3) var(--s-5); margin-top: var(--s-7); }
.contact__address {
  font-size: var(--step-2); font-weight: 700; letter-spacing: -0.02em;
  text-decoration: underline; text-decoration-color: var(--signal); text-decoration-thickness: 2px; text-underline-offset: 0.2em;
}
.contact__address:hover { color: var(--signal-text); }
.copy {
  display: inline-flex; align-items: center; gap: 0.45em; min-height: 2.75rem; padding: 0 1rem;
  border: 1px solid var(--rule); border-radius: 999px; background: transparent; color: var(--ink-2);
  font: inherit; font-size: var(--step--1); font-weight: 600; cursor: pointer;
  transition: border-color 0.2s var(--ease-out), color 0.2s var(--ease-out);
}
.copy:hover { border-color: var(--ink); color: var(--ink); }
.copy .icon--check { display: none; }
.copy.is-copied .icon--check { display: block; color: var(--signal-text); }
.copy.is-copied .icon--copy { display: none; }
.contact__where { display: inline-flex; align-items: center; gap: 0.45em; margin-top: var(--s-6); font-size: var(--step--1); color: var(--ink-3); }
@media (max-width: 34rem) {
  .contact__address { font-size: clamp(1.15rem, 6vw, 1.5rem); }
  .hero__links .btn { flex: 1 1 auto; justify-content: center; }
}

/* ---------- Footer ---------- */
.foot {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--s-2) var(--s-6);
  padding-block: var(--s-6) var(--s-7);
  border-top: 1px solid var(--rule);
  font-size: var(--step--1); color: var(--ink-3);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-delay: 0ms !important; transition-duration: 0.01ms !important; }
}