/*
 * thedatadudech.github.io — site styles.
 *
 * Design decisions:
 * - Palette borrowed from the Thawr project (navy #0b2233, blues #1d4f7a→#4fc3c8,
 *   teal #3fb8c4) so the personal site and the flagship project look related.
 * - System font stack only: nothing is fetched from a third party.
 * - Light and dark are both defined as token sets. The default follows
 *   prefers-color-scheme; a data-theme attribute set by theme.js overrides it.
 */

:root {
  --navy: #0b2233;
  --blue-900: #1d4f7a;
  --blue-700: #24678f;
  --blue-500: #2b8aa8;
  --blue-300: #3aaebf;
  --teal: #3fb8c4;
  --aqua: #4fc3c8;

  --bg: #f6f8f9;
  --bg-elev: #ffffff;
  --bg-muted: #eaf0f3;
  --text: #13232e;
  --text-muted: #4d616d;
  --line: #d6dfe4;
  --accent: #1d4f7a;
  --accent-strong: #0b2233;
  --accent-soft: rgba(63, 184, 196, 0.16);
  --link: #1d4f7a;
  --link-hover: #2b8aa8;
  --shadow: 0 1px 2px rgba(11, 34, 51, 0.06), 0 8px 24px rgba(11, 34, 51, 0.06);

  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans", "Noto Naskh Arabic", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono",
    monospace;

  --measure: 68ch;
  --radius: 12px;
  --gutter: clamp(1rem, 4vw, 2.5rem);

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b2233;
    --bg-elev: #10293d;
    --bg-muted: #142f45;
    --text: #e6eef2;
    --text-muted: #9fb4c0;
    --line: #22405a;
    --accent: #4fc3c8;
    --accent-strong: #e6eef2;
    --accent-soft: rgba(79, 195, 200, 0.14);
    --link: #4fc3c8;
    --link-hover: #8fdde0;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.25);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0b2233;
  --bg-elev: #10293d;
  --bg-muted: #142f45;
  --text: #e6eef2;
  --text-muted: #9fb4c0;
  --line: #22405a;
  --accent: #4fc3c8;
  --accent-strong: #e6eef2;
  --accent-soft: rgba(79, 195, 200, 0.14);
  --link: #4fc3c8;
  --link-hover: #8fdde0;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.25);
  color-scheme: dark;
}

/* ---------- base ---------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
  color: var(--accent-strong);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 650;
}

h3 {
  font-size: 1.2rem;
  font-weight: 650;
}

p {
  margin: 0 0 1em;
  max-width: var(--measure);
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

a:hover,
a:focus-visible {
  color: var(--link-hover);
}

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
  border-radius: 4px;
}

ul,
ol {
  padding-left: 1.25rem;
}

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--bg-muted);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  z-index: 100;
}

.skip-link:focus {
  top: 1rem;
}

/* ---------- layout ---------- */

.container {
  width: min(100% - 2 * var(--gutter), 72rem);
  margin-inline: auto;
}

.section {
  padding-block: clamp(3rem, 8vw, 6rem);
  border-top: 1px solid var(--line);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1.5rem;
  margin-bottom: 2rem;
}

.section-head .kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0;
}

.section-head h2 {
  margin: 0;
}

.lead {
  font-size: 1.2rem;
  color: var(--text-muted);
}

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 3.75rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 650;
  text-decoration: none;
  color: var(--accent-strong);
}

.brand svg {
  width: 1.75rem;
  height: 1.75rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem 1.1rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.site-nav a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.95rem;
  padding: 0.25rem 0;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--accent-strong);
}

.theme-toggle {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--text);
  border-radius: 999px;
  width: 2.25rem;
  height: 2.25rem;
  display: inline-grid;
  place-items: center;
  cursor: pointer;
}

.theme-toggle svg {
  width: 1.1rem;
  height: 1.1rem;
}

.theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

[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) {
  .site-nav a:not(.theme-toggle) {
    display: none;
  }
}

/* ---------- hero ---------- */

.hero {
  padding-block: clamp(3.5rem, 10vw, 7rem) clamp(3rem, 8vw, 5rem);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: auto -20% -40% auto;
  width: 60vw;
  max-width: 48rem;
  aspect-ratio: 1;
  background: radial-gradient(
    closest-side,
    var(--accent-soft),
    transparent 70%
  );
  pointer-events: none;
}

.hero .container {
  position: relative;
}

.hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero h1 .arabic-name {
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
}

.hero .positioning {
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  max-width: 44ch;
  color: var(--text);
}

.hero .location {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 1rem;
}

.hero .location svg {
  width: 1rem;
  height: 1rem;
  fill: currentColor;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--accent);
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  background: transparent;
}

.btn:hover,
.btn:focus-visible {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--blue-500);
  color: #fff;
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  max-width: 48rem;
  list-style: none;
  padding-left: 0;
}

.hero-facts li {
  display: grid;
  gap: 0.1rem;
}

.hero-facts strong {
  font-size: 1.35rem;
  color: var(--accent-strong);
}

.hero-facts span {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.subhead {
  margin-top: 2rem;
}

/* ---------- how I work ---------- */

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 5vw, 4rem);
  align-items: start;
}

@media (max-width: 56rem) {
  .split {
    grid-template-columns: 1fr;
  }
}

.loop {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.75rem;
  counter-reset: step;
}

.loop li {
  position: relative;
  padding: 1rem 1rem 1rem 3.25rem;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.loop li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 1rem;
  top: 1rem;
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.9rem;
}

.loop strong {
  display: block;
  color: var(--accent-strong);
}

.loop p {
  margin: 0.15rem 0 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.doc-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  margin: 0.5rem 0 1.5rem;
  list-style: none;
}

.doc-list li {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
  background: var(--bg-muted);
  border: 1px solid var(--line);
}

.naming {
  margin-top: 2.5rem;
  padding: 1.5rem;
  border-left: 3px solid var(--teal);
  background: var(--bg-elev);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.naming p:last-child {
  margin-bottom: 0;
}

/* ---------- projects ---------- */

.featured {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

@media (max-width: 56rem) {
  .featured {
    grid-template-columns: 1fr;
  }
}

.featured-visual {
  display: grid;
  align-content: start;
  gap: 1rem;
}

.featured-visual img {
  width: 100%;
  max-width: 22rem;
  height: auto;
  display: block;
}

.featured-visual .tagline {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.95rem;
  margin: 0;
}

.featured h3 {
  font-size: 1.6rem;
}

.featured .meaning {
  color: var(--text-muted);
  border-left: 2px solid var(--line);
  padding-left: 1rem;
  font-style: normal;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 0;
}

.tags li {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.card-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-top: 1rem;
  font-size: 0.95rem;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
  gap: 1.25rem;
}

.project {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.35rem;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.project:hover {
  border-color: var(--teal);
}

.project .theme {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0;
}

.project h3 {
  margin: 0;
}

.project h3 a {
  text-decoration: none;
  color: var(--accent-strong);
}

.project h3 a:hover,
.project h3 a:focus-visible {
  text-decoration: underline;
}

.project p {
  margin: 0;
  font-size: 0.97rem;
  color: var(--text-muted);
}

.project .meaning {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-style: italic;
}

.project .tags {
  margin-top: auto;
  padding-top: 0.5rem;
}

/* ---------- background ---------- */

.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0;
}

.timeline li {
  display: grid;
  grid-template-columns: 8.5rem minmax(0, 1fr);
  gap: 1.25rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.timeline li:last-child {
  border-bottom: 0;
}

@media (max-width: 40rem) {
  .timeline li {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }
}

.timeline time {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  padding-top: 0.2rem;
}

.timeline strong {
  display: block;
  color: var(--accent-strong);
}

.timeline p {
  margin: 0.15rem 0 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.stack {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.stack div {
  padding: 1.1rem 1.2rem;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.stack h4 {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
}

.stack p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.awards {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.6rem;
}

.awards li {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: 1rem;
  font-size: 0.97rem;
}

.awards time {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.85rem;
  padding-top: 0.15rem;
}

/* ---------- publications ---------- */

.pubs {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1rem;
}

.pubs li {
  padding: 1rem 1.2rem;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 0.97rem;
}

.pubs .authors {
  color: var(--text-muted);
}

.pubs .title {
  display: block;
  color: var(--accent-strong);
  font-weight: 600;
}

.pubs .venue {
  color: var(--text-muted);
}

.pubs .doi {
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.pubs-compact {
  columns: 2;
  column-gap: 2rem;
  padding-left: 1.2rem;
  margin: 0.5rem 0 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

@media (max-width: 40rem) {
  .pubs-compact {
    columns: 1;
  }
}

.pubs-compact li {
  break-inside: avoid;
  margin-bottom: 0.35rem;
}

/* ---------- contact ---------- */

.contact-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 1rem;
}

.contact-list li {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1.2rem;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.contact-list svg {
  width: 1.4rem;
  height: 1.4rem;
  fill: currentColor;
  color: var(--accent);
  flex: none;
}

.contact-list span {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.contact-list a {
  font-weight: 600;
  text-decoration: none;
}

.placeholder {
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 1px dashed var(--line);
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding-block: 2rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 2rem;
}

.site-footer p {
  margin: 0;
}

/* ---------- 404 ---------- */

.notfound .kicker {
  font-family: var(--font-mono);
  color: var(--accent);
}

.notfound {
  min-height: 70vh;
  display: grid;
  place-content: center;
  text-align: center;
  padding-block: 4rem;
}

@media print {
  .site-header,
  .hero-actions,
  .theme-toggle {
    display: none;
  }
}