/* ============================================================
   Neural Navy design system
   Mohammed Al-Shujaa, personal portfolio
   ============================================================ */

:root {
  /* Palette */
  --bg: #0B1121;
  --surface: #131C31;
  --border: #1E293B;
  --text: #E2E8F0;
  --text-dim: #94A3B8;
  --cyan: #22D3EE;
  --violet: #A78BFA;
  --amber: #FBBF24;

  /* Category colors */
  --cat-ml: #22D3EE;
  --cat-nlp: #A78BFA;
  --cat-web: #FBBF24;

  /* Type */
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* 8-pt spacing scale */
  --s1: 8px;
  --s2: 16px;
  --s3: 24px;
  --s4: 32px;
  --s5: 48px;
  --s6: 64px;
  --s7: 96px;
  --s8: 120px;

  --container: 1140px;
  --radius: 14px;
  --radius-sm: 8px;
  --nav-h: 64px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast: 150ms;
  --t: 200ms;
  --t-slow: 300ms;
}

/* ------------------------------------------------------------ reset */

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 var(--s2);
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.1rem, 5vw, 3.1rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.1rem); }
h3 { font-size: 1.2rem; }

p { margin: 0 0 var(--s2); }

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--cyan);
  color: #06131c;
  padding: var(--s1) var(--s2);
  font-weight: 600;
  z-index: 200;
}
.skip-link:focus { left: var(--s2); top: var(--s2); }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--s3);
}

.section { padding: var(--s7) 0; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  margin: 0 0 var(--s2);
  text-transform: none;
}

.section-title { margin-bottom: var(--s4); }

.lead { color: var(--text-dim); font-size: 1.05rem; }

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

/* ----------------------------------------------------------- navbar */

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  border-bottom: 1px solid var(--border);
}

/* The translucent blur sits on a pseudo-element rather than on .navbar itself.
   An element with backdrop-filter becomes the containing block for any
   position: fixed descendant, which would trap the mobile menu inside this
   64px bar instead of letting it cover the viewport. */
.navbar::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(11, 17, 33, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.navbar__inner {
  position: relative;
  z-index: 1;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.wordmark:hover { text-decoration: none; }
.wordmark__dot { color: var(--cyan); }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--s4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  position: relative;
  color: var(--text-dim);
  font-size: 0.95rem;
  font-weight: 500;
  padding: var(--s1) 0;
  text-decoration: none;
  transition: color var(--t) var(--ease);
}
.nav-links a:hover { color: var(--text); text-decoration: none; }

.nav-links a[aria-current='page'] { color: var(--cyan); }
.nav-links a[aria-current='page']::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--cyan);
  border-radius: 2px;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px;
  cursor: pointer;
  line-height: 0;
}
.nav-toggle__bar {
  display: block;
  width: 20px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--t) var(--ease), opacity var(--t) var(--ease);
}
.nav-toggle__bar + .nav-toggle__bar { margin-top: 4px; }

.nav-toggle[aria-expanded='true'] .nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded='true'] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded='true'] .nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 767px) {
  .nav-toggle { display: block; }

  .nav-links {
    position: fixed;
    inset: var(--nav-h) 0 0 0;
    flex-direction: column;
    justify-content: center;
    gap: var(--s5);
    background: rgba(11, 17, 33, 0.98);
    backdrop-filter: blur(12px);
    transform: translateX(100%);
    transition: transform var(--t-slow) var(--ease);
  }
  .nav-links[data-open='true'] { transform: translateX(0); }
  .nav-links a { font-size: 1.4rem; font-family: var(--font-display); }
}

/* --------------------------------------------------------- buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s1);
  padding: 13px var(--s3);
  border-radius: 999px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--t) var(--ease), background var(--t) var(--ease),
              box-shadow var(--t) var(--ease), border-color var(--t) var(--ease);
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }

.btn--primary {
  background: var(--cyan);
  color: #06131c;
}
.btn--primary:hover { box-shadow: 0 8px 24px rgba(34, 211, 238, 0.28); }

.btn--secondary {
  background: transparent;
  color: var(--cyan);
  border-color: var(--cyan);
}
.btn--secondary:hover { background: rgba(34, 211, 238, 0.1); }

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

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

.hero {
  position: relative;
  padding: var(--s7) 0 var(--s6);
  overflow: hidden;
}

.hero__constellation {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.55;
}

.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 60fr 40fr;
  gap: var(--s6);
  align-items: center;
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--cyan);
  margin: 0 0 var(--s2);
  letter-spacing: 0.04em;
}

.hero__name {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  margin: 0 0 var(--s2);
  text-transform: uppercase;
  letter-spacing: -0.03em;
}

.hero__subheading {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.2rem, 2.6vw, 1.6rem);
  line-height: 1.3;
  color: var(--text);
  margin: 0 0 var(--s3);
}
.hero__subheading .grad {
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__intro {
  color: var(--text-dim);
  max-width: 52ch;
  margin-bottom: var(--s4);
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
  margin-bottom: var(--s3);
}

.hero__socials {
  display: flex;
  gap: var(--s3);
  list-style: none;
  margin: 0;
  padding: 0;
}
.hero__socials a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-dim);
  transition: color var(--t) var(--ease);
}
.hero__socials a:hover { color: var(--cyan); text-decoration: none; }

.hero__photo-wrap { display: flex; justify-content: center; }

.hero__photo {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid rgba(34, 211, 238, 0.4);
  box-shadow: 0 0 60px rgba(34, 211, 238, 0.12);
  background: var(--surface);
}

@media (max-width: 900px) {
  .hero__inner {
    grid-template-columns: 1fr;
    gap: var(--s4);
    text-align: center;
  }
  .hero__photo-wrap { order: -1; }
  .hero__photo { width: 160px; height: 160px; }
  .hero__intro { margin-inline: auto; }
  .hero__ctas, .hero__socials { justify-content: center; }
  .hero__ctas .btn { flex: 1 1 100%; }
}

/* ------------------------------------------------------ stat strip */

.stats {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: rgba(19, 28, 49, 0.5);
}
.stats__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--s2) var(--s5);
  list-style: none;
  margin: 0;
  padding: var(--s3) 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-dim);
}
.stats__list strong { color: var(--cyan); font-weight: 600; }

/* ------------------------------------------------------ cards grid */

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--s3);
}

@media (min-width: 1024px) {
  .grid-cards--2 { grid-template-columns: repeat(2, 1fr); }
  .grid-cards--3 { grid-template-columns: repeat(3, 1fr); }
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--t-slow) var(--ease),
              border-color var(--t-slow) var(--ease),
              box-shadow var(--t-slow) var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(34, 211, 238, 0.5);
  box-shadow: 0 12px 32px rgba(34, 211, 238, 0.1);
}

.card__thumb {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: #0e1730;
  border-bottom: 1px solid var(--border);
}

.card__body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: var(--s3);
  gap: var(--s2);
}

.card__title { margin: 0; font-size: 1.15rem; }

.card__desc {
  color: var(--text-dim);
  font-size: 0.94rem;
  margin: 0;
  flex: 1;
}

.card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s1);
}

.card__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
  padding-top: var(--s1);
}
.card__links a {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.card__note {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  margin: 0;
}

/* ------------------------------------------------ pills and chips */

.pill {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  letter-spacing: 0.03em;
  white-space: nowrap;
}
.pill--ml { background: rgba(34, 211, 238, 0.12); color: var(--cat-ml); }
.pill--nlp { background: rgba(167, 139, 250, 0.12); color: var(--cat-nlp); }
.pill--web { background: rgba(251, 191, 36, 0.12); color: var(--cat-web); }
.pill--featured {
  background: rgba(226, 232, 240, 0.1);
  color: var(--text);
  border: 1px solid var(--border);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.chips li {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 3px 8px;
}

/* --------------------------------------------------- filter pills */

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s1);
  margin-bottom: var(--s4);
}

.filter-pill {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 8px var(--s2);
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  transition: all var(--t) var(--ease);
}
.filter-pill:hover { color: var(--text); border-color: var(--text-dim); }
.filter-pill[aria-pressed='true'] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #06131c;
  font-weight: 600;
}

/* -------------------------------------------------------- about */

.about__grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--s5);
  align-items: start;
}
@media (max-width: 860px) {
  .about__grid { grid-template-columns: 1fr; gap: var(--s3); }
}

.about__photo {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  aspect-ratio: 4 / 5;
  object-fit: cover;
  background: var(--surface);
}

.info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--s3);
}

.info-card h3 { margin-bottom: var(--s1); }
.info-card p:last-child { margin-bottom: 0; }

/* -------------------------------------------------- skills rows */

.skill-group + .skill-group { margin-top: var(--s4); }

.skill-group__label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: var(--s2);
  padding-bottom: var(--s1);
  border-bottom: 1px solid var(--border);
}

.skill-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
  list-style: none;
  margin: 0;
  padding: 0;
}

.skill {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  width: 88px;
  padding: var(--s2) var(--s1);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease);
}
.skill:hover { border-color: rgba(34, 211, 238, 0.5); transform: translateY(-2px); }

.skill__icon {
  font-size: 1.7rem;
  color: var(--cyan);
  line-height: 1;
  height: 28px;
  display: flex;
  align-items: center;
}

/* Fallback tile for tools with no Devicon glyph. */
.skill__monogram {
  height: 28px;
  min-width: 28px;
  padding: 0 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  background: rgba(34, 211, 238, 0.12);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
}

.skill__name {
  font-size: 0.72rem;
  color: var(--text-dim);
  text-align: center;
  line-height: 1.3;
}

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

.contact__grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: var(--s5);
  align-items: start;
}
@media (max-width: 860px) {
  .contact__grid { grid-template-columns: 1fr; gap: var(--s3); }
}

.field { margin-bottom: var(--s3); }

.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text);
  margin-bottom: var(--s1);
  letter-spacing: 0.03em;
}

.field input,
.field textarea,
.field select {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.97rem;
  padding: 12px var(--s2);
  transition: border-color var(--t) var(--ease), box-shadow var(--t) var(--ease);
}
.field textarea { resize: vertical; min-height: 150px; }

.field input:focus,
.field textarea:focus,
.field select:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.18);
}

.field input::placeholder,
.field textarea::placeholder { color: #64748B; }

.form-status {
  margin-top: var(--s2);
  font-size: 0.9rem;
  min-height: 1.4em;
}
.form-status--error { color: #FCA5A5; }
.form-status--ok { color: var(--cyan); }

.form-success {
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.4);
  border-radius: var(--radius);
  padding: var(--s4);
  text-align: center;
}
.form-success h3 { color: var(--cyan); }

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--s3);
}
.contact-list li {
  display: flex;
  gap: var(--s2);
  align-items: flex-start;
}
.contact-list__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 2px;
}
.contact-list__value { font-size: 0.94rem; word-break: break-word; }

/* ----------------------------------------------------- updates */

.updates-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--s2);
}
.update-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--violet);
  border-radius: var(--radius-sm);
  padding: var(--s3);
}
.update-item__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.update-item p { margin: 0; color: var(--text-dim); font-size: 0.92rem; }

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

.footer {
  border-top: 1px solid var(--border);
  padding: var(--s5) 0 var(--s4);
  margin-top: var(--s7);
}
.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--s2);
  text-align: center;
}
.footer__socials {
  display: flex;
  gap: var(--s3);
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer__socials a {
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  transition: color var(--t) var(--ease);
}
.footer__socials a:hover { color: var(--cyan); text-decoration: none; }
.footer__colophon {
  color: var(--text-dim);
  font-size: 0.82rem;
  margin: 0;
}

/* -------------------------------------------- loading and empty */

.state-msg {
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: var(--s3) 0;
}

/* ----------------------------------------------------- motion */

.fade-up {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 500ms var(--ease), transform 500ms var(--ease);
}
.fade-up.is-visible { opacity: 1; transform: none; }

/* Staggered one-time hero entrance. */
.hero-anim > * {
  opacity: 0;
  animation: heroUp 500ms var(--ease) forwards;
}
.hero-anim > *:nth-child(1) { animation-delay: 60ms; }
.hero-anim > *:nth-child(2) { animation-delay: 140ms; }
.hero-anim > *:nth-child(3) { animation-delay: 220ms; }
.hero-anim > *:nth-child(4) { animation-delay: 300ms; }
.hero-anim > *:nth-child(5) { animation-delay: 380ms; }
.hero-anim > *:nth-child(6) { animation-delay: 460ms; }

@keyframes heroUp {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .fade-up { opacity: 1; transform: none; }
  .hero-anim > * { opacity: 1; animation: none; }
  .btn:hover, .card:hover, .skill:hover { transform: none; }
}

/* ------------------------------------------------- small screens */

@media (max-width: 480px) {
  body { font-size: 16px; }
  .section { padding: var(--s6) 0; }
  .hero { padding: var(--s5) 0 var(--s4); }
  .container { padding: 0 var(--s3); }
}