*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0c0f14;
  --bg-alt: #111620;
  --surface: #161c28;
  --surface-hover: #1c2433;
  --border: rgba(255, 255, 255, 0.08);
  --text: #e8eaef;
  --text-muted: #8b93a7;
  --accent: #3d9ea0;
  --accent-soft: rgba(61, 158, 160, 0.12);
  --accent-glow: rgba(61, 158, 160, 0.25);
  --display: Calibri, "Segoe UI", system-ui, sans-serif;
  --sans: "Plus Jakarta Sans", system-ui, sans-serif;
  --sans-ar: "IBM Plex Sans Arabic", var(--sans);
  --radius: 12px;
  --radius-lg: 20px;
  --nav-height: 72px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body.nav-open {
  overflow: hidden;
}

.skip-link {
  position: absolute;
  inset-inline-start: 1rem;
  top: -100%;
  z-index: 200;
  padding: 0.75rem 1.25rem;
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
  border-radius: 0 0 var(--radius) var(--radius);
  transition: top var(--transition);
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

:focus:not(:focus-visible) {
  outline: none;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

.svg-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.container {
  width: min(1100px, 92vw);
  margin-inline: auto;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(12, 15, 20, 0.75);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}

.nav--scrolled {
  border-bottom-color: var(--border);
  background: rgba(12, 15, 20, 0.92);
}

.nav__inner {
  width: min(1100px, 92vw);
  height: 100%;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  line-height: 0;
}

.nav__logo img {
  display: block;
  width: 40px;
  height: 40px;
}

.nav__end {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav__github {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: var(--text-muted);
  border-radius: 999px;
  transition: color var(--transition), background var(--transition);
}

.nav__github:hover {
  color: var(--text);
}

.nav__github svg {
  width: 22px;
  height: 22px;
}

.nav__lang {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 0.375rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.nav__lang[lang="ar"] {
  font-family: var(--sans-ar);
}

.nav__lang[lang="en"] {
  font-family: var(--sans);
}

.nav__lang:hover {
  color: var(--text);
  border-color: var(--text-muted);
  background: var(--surface);
}

.nav__links {
  display: flex;
  gap: 2rem;
}

.nav__links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
}

.nav__links a:hover {
  color: var(--text);
}

.nav__links a.nav__link--active,
.nav__links a[aria-current="true"] {
  color: var(--accent);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: transform var(--transition), opacity var(--transition);
}

.nav__toggle[aria-expanded="true"] span:first-child {
  transform: translateY(4px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-4px) rotate(-45deg);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 70% 20%, var(--accent-glow), transparent 60%),
    radial-gradient(ellipse 50% 40% at 10% 80%, rgba(60, 80, 140, 0.15), transparent 50%),
    var(--bg);
  pointer-events: none;
}

.hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 40%, black 20%, transparent 70%);
  opacity: 0.4;
}

.hero__content {
  position: relative;
  padding-block: 4rem 6rem;
  text-align: start;
}

.hero__eyebrow {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.hero__title {
  font-family: var(--display);
  font-size: clamp(3.5rem, 9vw, 5.5rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: 0.01em;
  margin-bottom: 1.75rem;
  -webkit-text-stroke: 0.04em currentColor;
  paint-order: stroke fill;
}

.hero__summary {
  max-width: 520px;
  font-size: 1.125rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 3rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.875rem 1.75rem;
  border-radius: 999px;
  font-size: 0.9375rem;
  font-weight: 600;
  transition: all var(--transition);
}

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

.btn--primary:hover {
  background: #4aafb1;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn--ghost {
  border: 1px solid var(--border);
  color: var(--text);
}

.btn--ghost:hover {
  border-color: var(--text-muted);
  background: var(--surface);
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.hero__divider {
  opacity: 0.4;
}

.error-page {
  padding-top: 0;
}

.error-page .hero__content {
  text-align: center;
  margin-inline: auto;
}

.error-page .hero__summary {
  margin-inline: auto;
  text-align: center;
}

.error-page .hero__actions {
  justify-content: center;
}

/* Sections */
.section {
  padding-block: 6rem;
}

.section--alt {
  background: var(--bg-alt);
}

.section--contact {
  padding-bottom: 8rem;
}

.section__header {
  margin-bottom: 3rem;
}

.section__header--center {
  text-align: center;
}

.section__header--center .section__subtitle {
  margin-inline: auto;
}

.section__label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section__header h2 {
  font-family: var(--display);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 400;
  letter-spacing: 0.01em;
}

.section__subtitle {
  margin-top: 1rem;
  color: var(--text-muted);
  max-width: 420px;
}

/* About */
.about__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.about__text {
  font-size: 1.0625rem;
  color: var(--text-muted);
}

/* Skills */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition), transform var(--transition);
}

.skill-card:hover {
  border-color: rgba(61, 158, 160, 0.3);
  transform: translateY(-2px);
}

.skill-card h3 {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag-list li {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.375rem 0.75rem;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
}

.skill-icon {
  width: 1rem;
  height: 1rem;
  fill: currentColor;
  flex-shrink: 0;
  overflow: visible;
}

.strengths {
  border-top: 1px solid var(--border);
  padding-top: 2.5rem;
}

.strengths__title {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.strengths__list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.75rem 2rem;
}

.strengths__list li {
  position: relative;
  padding-inline-start: 1.25rem;
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.strengths__list li::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* Timeline */
.timeline {
  position: relative;
  padding-inline-start: 2rem;
}

.timeline::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--border);
}

.timeline__item {
  position: relative;
  padding-bottom: 2.5rem;
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__marker {
  position: absolute;
  inset-inline-start: -2rem;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  transform: translateX(calc(-50% + 0.5px));
}

[dir="rtl"] .timeline__marker {
  transform: translateX(calc(50% - 0.5px));
}

.timeline__content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: border-color var(--transition);
}

.timeline__content:hover {
  border-color: rgba(61, 158, 160, 0.25);
}

.timeline__header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.timeline__header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline__company {
  font-size: 0.9375rem;
  color: var(--accent);
}

.timeline__header time {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
  padding: 0.25rem 0.75rem;
  background: var(--bg);
  border-radius: 999px;
}

.timeline__content > p {
  font-size: 0.9375rem;
  color: var(--text-muted);
}

/* Projects */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: border-color var(--transition), transform var(--transition);
  display: block;
  color: inherit;
  text-decoration: none;
}

a.project-card:hover {
  border-color: rgba(61, 158, 160, 0.3);
  transform: translateY(-3px);
}

article.project-card:hover {
  border-color: rgba(61, 158, 160, 0.3);
  transform: translateY(-3px);
}

.project-card__icon {
  font-family: var(--display);
  font-size: 2.5rem;
  font-weight: 400;
  color: var(--accent);
  opacity: 0.5;
  margin-bottom: 1.25rem;
}

.project-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.project-card p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.project-card__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.25rem 0.625rem;
  border-radius: 999px;
  margin-bottom: 0.875rem;
}

.project-card__link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
}

/* Education */
.edu__grid {
  display: grid;
  gap: 2.5rem;
}

.edu-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.edu-card--featured {
  border-color: rgba(61, 158, 160, 0.25);
  background: linear-gradient(135deg, var(--surface) 0%, rgba(61, 158, 160, 0.05) 100%);
}

.edu-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.edu-card__institution {
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.edu-card__meta {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.cert-list {
  display: grid;
  gap: 1rem;
}

.cert-list li {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem 1.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.cert-list strong {
  font-size: 0.9375rem;
  font-weight: 600;
}

.cert-list span {
  font-size: 0.8125rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* Contact */
.contact__grid {
  display: grid;
  grid-template-columns: minmax(260px, 1fr);
  gap: 1rem;
  max-width: 420px;
  margin-inline: auto;
}

.contact-card {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.contact-card:hover {
  border-color: var(--accent);
  background: var(--surface-hover);
  transform: translateY(-2px);
}

.contact-card__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.contact-card__value {
  font-size: 0.9375rem;
  font-weight: 500;
  word-break: break-all;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding-block: 2rem;
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer__top {
  transition: color var(--transition);
}

.footer__top:hover {
  color: var(--accent);
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

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

  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Responsive */
@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(12, 15, 20, 0.98);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }

  .nav__links--open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__links li a {
    display: block;
    padding: 0.875rem 1.5rem;
  }

  .timeline {
    padding-inline-start: 1.5rem;
  }

  .timeline__marker {
    inset-inline-start: -1.5rem;
  }

  .timeline__header {
    flex-direction: column;
  }

  .cert-list li {
    flex-direction: column;
  }
}

/* RTL (Arabic) */
[dir="rtl"] body {
  font-family: var(--sans-ar);
}

[dir="rtl"] .hero__eyebrow,
[dir="rtl"] .section__label,
[dir="rtl"] .skill-card h3,
[dir="rtl"] .strengths__title,
[dir="rtl"] .project-card__tag,
[dir="rtl"] .contact-card__label {
  letter-spacing: 0;
  text-transform: none;
}

[dir="rtl"] .hero__bg {
  background:
    radial-gradient(ellipse 80% 60% at 30% 20%, var(--accent-glow), transparent 60%),
    radial-gradient(ellipse 50% 40% at 90% 80%, rgba(60, 80, 140, 0.15), transparent 50%),
    var(--bg);
}

[dir="rtl"] .hero__summary,
[dir="rtl"] .hero__meta {
  text-align: start;
}

[dir="rtl"] .error-page .hero__summary {
  text-align: center;
}