/* Art direction: premium engineering portfolio → minimal, technical, calm, modern
   Palette: deep blue + emerald + soft purple on neutral layered surfaces
   Typography: Inter for English UI/body, Cairo for Arabic readability and elegance
   Density: balanced and spacious with restrained motion */

/* =========================
   Design Tokens
========================= */
:root,
[data-theme="light"] {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(3rem, 0.5rem + 7vw, 7rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  --color-bg: #f5f7fb;
  --color-surface: #fbfcff;
  --color-surface-2: #f0f4fb;
  --color-surface-offset: #e9eef8;
  --color-surface-offset-2: #dde5f2;
  --color-surface-dynamic: #d3dfee;
  --color-divider: #d7dfeb;
  --color-border: rgba(18, 34, 63, 0.12);

  --color-text: #101828;
  --color-text-muted: #44546f;
  --color-text-faint: #76839a;
  --color-text-inverse: #f8fbff;

  --color-primary: #123b6b;
  --color-primary-hover: #0d3158;
  --color-primary-active: #092540;
  --color-primary-highlight: rgba(18, 59, 107, 0.12);

  --color-success: #0f7d64;
  --color-success-hover: #0d6854;
  --color-success-active: #0a4f40;
  --color-success-highlight: rgba(15, 125, 100, 0.12);

  --color-purple: #7f6be8;
  --color-purple-hover: #6e58df;
  --color-purple-active: #5b46ca;
  --color-purple-highlight: rgba(127, 107, 232, 0.12);

  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 600ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-sm: 0 1px 2px rgba(14, 30, 60, 0.05);
  --shadow-md: 0 10px 30px rgba(14, 30, 60, 0.08);
  --shadow-lg: 0 24px 60px rgba(14, 30, 60, 0.12);

  --content-narrow: 640px;
  --content-default: 1120px;
  --content-wide: 1280px;
  --content-full: 100%;

  --font-body-en: "Inter", system-ui, sans-serif;
  --font-body-ar: "Cairo", system-ui, sans-serif;
  --font-display-en: "Inter", system-ui, sans-serif;
  --font-display-ar: "Cairo", system-ui, sans-serif;
}

[data-theme="dark"] {
  --color-bg: #09111f;
  --color-surface: #0f1829;
  --color-surface-2: #121f33;
  --color-surface-offset: #162339;
  --color-surface-offset-2: #1b2b45;
  --color-surface-dynamic: #223656;
  --color-divider: #21324f;
  --color-border: rgba(233, 241, 255, 0.1);

  --color-text: #eaf1ff;
  --color-text-muted: #b7c4dd;
  --color-text-faint: #8fa0bf;
  --color-text-inverse: #0c1626;

  --color-primary: #79a7dd;
  --color-primary-hover: #95baea;
  --color-primary-active: #b7d2f4;
  --color-primary-highlight: rgba(121, 167, 221, 0.16);

  --color-success: #4dcaa8;
  --color-success-hover: #6ed5b7;
  --color-success-active: #8de0c7;
  --color-success-highlight: rgba(77, 202, 168, 0.14);

  --color-purple: #b5a8ff;
  --color-purple-hover: #c5bcff;
  --color-purple-active: #d4ceff;
  --color-purple-highlight: rgba(181, 168, 255, 0.14);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.24);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.28);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.4);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #09111f;
    --color-surface: #0f1829;
    --color-surface-2: #121f33;
    --color-surface-offset: #162339;
    --color-surface-offset-2: #1b2b45;
    --color-surface-dynamic: #223656;
    --color-divider: #21324f;
    --color-border: rgba(233, 241, 255, 0.1);

    --color-text: #eaf1ff;
    --color-text-muted: #b7c4dd;
    --color-text-faint: #8fa0bf;
    --color-text-inverse: #0c1626;

    --color-primary: #79a7dd;
    --color-primary-hover: #95baea;
    --color-primary-active: #b7d2f4;
    --color-primary-highlight: rgba(121, 167, 221, 0.16);

    --color-success: #4dcaa8;
    --color-success-hover: #6ed5b7;
    --color-success-active: #8de0c7;
    --color-success-highlight: rgba(77, 202, 168, 0.14);

    --color-purple: #b5a8ff;
    --color-purple-hover: #c5bcff;
    --color-purple-active: #d4ceff;
    --color-purple-highlight: rgba(181, 168, 255, 0.14);
  }
}

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

html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

html[lang="ar"] {
  --font-body: var(--font-body-ar);
  --font-display: var(--font-display-ar);
}

html[lang="en"] {
  --font-body: var(--font-body-en);
  --font-display: var(--font-display-en);
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background:
    radial-gradient(circle at top left, var(--color-primary-highlight), transparent 30%),
    radial-gradient(circle at bottom right, var(--color-success-highlight), transparent 28%),
    var(--color-bg);
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

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

p,
li {
  text-wrap: pretty;
  max-width: 72ch;
}

h1,
h2,
h3,
h4 {
  text-wrap: balance;
  line-height: 1.08;
  font-family: var(--font-display);
}

::selection {
  background: var(--color-primary-highlight);
  color: var(--color-text);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.skip-link {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 1000;
  padding: var(--space-3) var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-full);
  transform: translateY(-200%);
  transition: transform var(--transition-interactive);
}

.skip-link:focus {
  transform: translateY(0);
}

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

.section {
  position: relative;
  padding-block: clamp(var(--space-16), 10vw, var(--space-24));
}

.section-heading {
  margin-bottom: var(--space-10);
  display: grid;
  gap: var(--space-3);
}

.section-kicker,
.eyebrow,
.panel-label,
.info-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-text-faint);
}

.section-heading h2 {
  font-size: var(--text-xl);
  max-width: 18ch;
}

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.06), transparent), var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
}

.glass {
  background: color-mix(in srgb, var(--color-surface) 80%, transparent);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(16px);
}

.site-shell {
  overflow: clip;
}

/* =========================
   Header
========================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  background: color-mix(in srgb, var(--color-bg) 76%, transparent);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  min-height: 4.75rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 44px;
}

.brand-mark {
  width: 2.5rem;
  height: 2.5rem;
  padding: 0.45rem;
  border-radius: 0.85rem;
  background: color-mix(in srgb, var(--color-primary) 10%, var(--color-surface));
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.brand-text {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.site-nav {
  justify-self: center;
}

.nav-menu {
  display: none;
  align-items: center;
  gap: var(--space-5);
}

.nav-menu a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.nav-menu a:hover,
.nav-menu a:focus-visible {
  color: var(--color-text);
}

.nav-toggle {
  width: 44px;
  height: 44px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--color-border);
  border-radius: 0.9rem;
  background: var(--color-surface);
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: var(--color-text);
  display: block;
  margin-block: 2px;
}

.header-actions,
.footer-actions {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.icon-button,
.text-button {
  min-width: 44px;
  min-height: 44px;
  padding: 0 var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-surface);
  color: var(--color-text);
}

.text-button {
  font-size: var(--text-sm);
}

/* =========================
   Hero
========================= */
.hero {
  min-height: min(100vh, 62rem);
  display: grid;
  align-items: center;
  isolation: isolate;
}

.hero-grid {
  display: grid;
  gap: var(--space-8);
  align-items: center;
}

.hero-copy {
  position: relative;
  z-index: 2;
  display: grid;
  gap: var(--space-5);
}

.hero-name {
  display: block;
  font-size: clamp(2.4rem, 1.3rem + 5vw, 5.5rem);
  letter-spacing: -0.05em;
}

.hero-title {
  display: block;
  margin-top: var(--space-3);
  min-height: 2.6em;
  font-size: clamp(1.25rem, 1rem + 1.7vw, 2rem);
  color: var(--color-text-muted);
  font-weight: 600;
}

.hero-description {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  max-width: 60ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.btn {
  min-height: 48px;
  padding: 0 var(--space-5);
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  transition:
    transform var(--transition-interactive),
    background var(--transition-interactive),
    color var(--transition-interactive),
    border-color var(--transition-interactive),
    box-shadow var(--transition-interactive);
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), color-mix(in srgb, var(--color-primary) 70%, var(--color-success)));
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-hover), color-mix(in srgb, var(--color-primary-hover) 70%, var(--color-success)));
}

.btn-secondary {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.hero-card {
  position: relative;
  z-index: 2;
}

.hero-card-panel {
  padding: clamp(var(--space-6), 4vw, var(--space-10));
  border-radius: 1.75rem;
}

.focus-list {
  list-style: none;
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.focus-list li {
  position: relative;
  padding-inline-start: var(--space-5);
  color: var(--color-text-muted);
}

.focus-list li::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: 0.7em;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-success), var(--color-purple));
}

.hero-metrics {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.hero-metrics li {
  padding: var(--space-4);
  background: color-mix(in srgb, var(--color-surface) 85%, transparent);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.hero-metrics strong {
  display: block;
  font-size: var(--text-lg);
  margin-bottom: var(--space-1);
}

.hero-particles,
.hero-orb {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-orb {
  filter: blur(50px);
  opacity: 0.6;
}

.hero-orb-1 {
  width: 28rem;
  height: 28rem;
  inset-inline-start: -6rem;
  top: 8%;
  background: radial-gradient(circle, color-mix(in srgb, var(--color-primary) 24%, transparent), transparent 65%);
  animation: floatOrb 10s ease-in-out infinite;
}

.hero-orb-2 {
  width: 24rem;
  height: 24rem;
  inset-inline-end: -4rem;
  bottom: 10%;
  background: radial-gradient(circle, color-mix(in srgb, var(--color-success) 20%, transparent), transparent 65%);
  animation: floatOrb 12s ease-in-out infinite reverse;
}

.hero-particles::before,
.hero-particles::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 25%, color-mix(in srgb, var(--color-primary) 28%, transparent) 0 2px, transparent 3px),
    radial-gradient(circle at 78% 20%, color-mix(in srgb, var(--color-success) 22%, transparent) 0 2px, transparent 3px),
    radial-gradient(circle at 35% 70%, color-mix(in srgb, var(--color-purple) 18%, transparent) 0 2px, transparent 3px),
    radial-gradient(circle at 70% 80%, color-mix(in srgb, var(--color-primary) 16%, transparent) 0 2px, transparent 3px);
  opacity: 0.7;
  animation: particleDrift 14s linear infinite;
}

.hero-particles::after {
  animation-duration: 20s;
  opacity: 0.35;
  transform: scale(1.08);
}

/* =========================
   Sections
========================= */
.about-layout,
.contact-grid {
  display: grid;
  gap: var(--space-6);
}

.about-copy {
  padding: clamp(var(--space-6), 4vw, var(--space-10));
  display: grid;
  gap: var(--space-4);
}

.about-copy p {
  color: var(--color-text-muted);
}

.about-points {
  display: grid;
  gap: var(--space-4);
}

.info-block {
  padding: var(--space-5);
  display: grid;
  gap: var(--space-2);
}

.info-block strong {
  font-size: var(--text-sm);
}

.skills-grid,
.experience-grid,
.projects-grid,
.philosophy-grid,
.stats-grid {
  display: grid;
  gap: var(--space-4);
}

.skills-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.skill-chip {
  min-height: 5.5rem;
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: flex-end;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--color-primary) 8%, transparent), transparent),
    var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  font-weight: 600;
  transition: transform var(--transition-interactive), border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}

.skill-chip:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--color-primary) 30%, var(--color-border));
  box-shadow: var(--shadow-md);
}

.experience-card,
.project-card,
.philosophy-grid .card,
.stat-card,
.contact-card {
  padding: clamp(var(--space-5), 4vw, var(--space-8));
}

.experience-card,
.project-card,
.philosophy-grid .card {
  display: grid;
  gap: var(--space-3);
}

.experience-card p,
.project-card p,
.philosophy-grid p,
.contact-card p {
  color: var(--color-text-muted);
}

.project-card .meta {
  font-size: var(--text-sm);
}

.timeline {
  position: relative;
  display: grid;
  gap: var(--space-6);
}

.timeline::before {
  content: "";
  position: absolute;
  inset-inline-start: 0.9rem;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--color-primary-highlight), var(--color-divider));
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-4);
  align-items: start;
}

.timeline-year {
  position: relative;
  z-index: 1;
  min-width: 4.5rem;
  height: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding-inline: var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-primary);
}

.timeline-content {
  padding: var(--space-5);
}

.timeline-content p {
  margin-top: var(--space-2);
  color: var(--color-text-muted);
}

.stats-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.stat-card {
  text-align: center;
}

.stat-card strong {
  display: block;
  font-size: var(--text-2xl);
  letter-spacing: -0.04em;
}

.stat-card span {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.contact-card {
  display: grid;
  gap: var(--space-4);
  align-content: start;
}

.contact-link {
  color: var(--color-text);
  font-weight: 500;
  word-break: break-word;
}

.contact-link:hover,
.contact-link:focus-visible {
  color: var(--color-primary);
}

.contact-domain {
  color: var(--color-success);
  font-weight: 700;
}

/* =========================
   Footer
========================= */
.site-footer {
  padding-block: var(--space-6);
  border-top: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--color-surface) 70%, transparent);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.footer-inner p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* =========================
   Reveal
========================= */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* =========================
   Mobile Nav
========================= */
.nav-menu.is-open {
  display: grid;
  position: absolute;
  top: calc(100% + 0.75rem);
  inset-inline: 1rem;
  padding: var(--space-4);
  background: color-mix(in srgb, var(--color-surface) 94%, transparent);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(20px);
}

.nav-menu.is-open a {
  min-height: 44px;
}

/* =========================
   Magnetic / Micro
========================= */
.magnetic {
  will-change: transform;
}

.icon-button:hover,
.text-button:hover,
.nav-toggle:hover {
  border-color: color-mix(in srgb, var(--color-primary) 28%, var(--color-border));
  box-shadow: var(--shadow-sm);
}

/* =========================
   RTL/LTR
========================= */
html[dir="rtl"] body {
  direction: rtl;
}

html[dir="ltr"] body {
  direction: ltr;
}

html[dir="ltr"] .timeline::before {
  inset-inline-start: 1rem;
}

html[dir="rtl"] .hero-description,
html[dir="rtl"] .about-copy p,
html[dir="rtl"] .experience-card p,
html[dir="rtl"] .project-card p,
html[dir="rtl"] .philosophy-grid p,
html[dir="rtl"] .contact-card p {
  text-align: start;
}

/* =========================
   Responsive
========================= */
@media (min-width: 768px) {
  .hero-grid,
  .about-layout,
  .contact-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }

  .hero-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .skills-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .experience-grid,
  .philosophy-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .projects-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .stats-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .nav-toggle {
    display: none;
  }

  .nav-menu {
    display: inline-flex;
    position: static;
    padding: 0;
    background: transparent;
    border: 0;
    box-shadow: none;
    backdrop-filter: none;
  }

  .experience-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .projects-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .philosophy-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .header-inner {
    grid-template-columns: auto auto auto;
  }

  .site-nav {
    justify-self: end;
  }

  .brand-text {
    display: none;
  }
}

/* =========================
   Reduced Motion
========================= */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }

  .hero-orb,
  .hero-particles::before,
  .hero-particles::after,
  .magnetic {
    animation: none !important;
    transform: none !important;
  }
}

/* =========================
   Keyframes
========================= */
@keyframes floatOrb {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(0, -18px, 0) scale(1.04); }
}

@keyframes particleDrift {
  0% { transform: translate3d(0, 0, 0); }
  50% { transform: translate3d(0, -10px, 0); }
  100% { transform: translate3d(0, 0, 0); }
}