/* ============================================================
   UTHMAN OLAWOYE — Personal Site
   Dark & Sleek Engineering Portfolio
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=IBM+Plex+Mono:wght@300;400;500&family=IBM+Plex+Sans:ital,wght@0,300;0,400;0,500;1,300&display=swap');

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --bg:        #080b0f;
  --bg2:       #0e1218;
  --bg3:       #141b24;
  --border:    #1e2a36;
  --accent:    #00d4ff;
  --accent2:   #7b61ff;
  --accent3:   #00ff9d;
  --text:      #e8edf2;
  --text-muted:#7a8a99;
  --text-dim:  #3d4f60;

  --font-display: 'Syne', sans-serif;
  --font-mono:    'IBM Plex Mono', monospace;
  --font-body:    'IBM Plex Sans', sans-serif;

  --nav-h: 68px;
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul { list-style: none; }

/* ── Noise overlay ─────────────────────────────────────────── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  opacity: 0.025;
  pointer-events: none;
  z-index: 9999;
}

/* ── Navigation ────────────────────────────────────────────── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(8, 11, 15, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(24px, 5vw, 80px);
}
.nav-logo {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.05em;
}
.nav-logo span { color: var(--text-muted); }
.nav-links {
  display: flex;
  gap: 36px;
  align-items: center;
}
.nav-links a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.2s;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width 0.25s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-cta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent) !important;
  border: 1px solid var(--accent);
  padding: 8px 18px;
  border-radius: 2px;
  transition: background 0.2s, color 0.2s !important;
}
.nav-cta:hover { background: var(--accent); color: var(--bg) !important; }
.nav-cta::after { display: none !important; }

/* hamburger */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--text); transition: all 0.3s; }

/* ── Page wrapper ───────────────────────────────────────────── */
main { padding-top: var(--nav-h); }

/* ── Section base ───────────────────────────────────────────── */
section { padding: 100px clamp(24px, 8vw, 120px); }

/* ── Eyebrow label ──────────────────────────────────────────── */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: '';
  display: inline-block;
  width: 28px; height: 1px;
  background: var(--accent);
}

/* ── Section heading ────────────────────────────────────────── */
.section-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.section-subtitle {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 520px;
  margin-bottom: 56px;
  font-weight: 300;
}

/* ── Divider line ───────────────────────────────────────────── */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0;
}

/* ── Tag / badge ────────────────────────────────────────────── */
.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-muted);
}
.tag.accent  { border-color: var(--accent);  color: var(--accent); }
.tag.accent2 { border-color: var(--accent2); color: var(--accent2); }
.tag.accent3 { border-color: var(--accent3); color: var(--accent3); }

/* ── Card base ──────────────────────────────────────────────── */
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 32px;
  transition: border-color 0.25s, transform 0.25s;
}
.card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-3px);
}

/* ── Button ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 14px 28px;
  border-radius: 2px;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: var(--accent);
  color: var(--bg);
  font-weight: 500;
}
.btn-primary:hover { background: #33ddff; }
.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* ── Footer ─────────────────────────────────────────────────── */
footer {
  padding: 48px clamp(24px, 8vw, 120px);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-logo {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
}
.footer-links {
  display: flex;
  gap: 24px;
}
.footer-links a {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--accent); }
.footer-copy {
  font-size: 12px;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* ── Page hero (inner pages) ────────────────────────────────── */
.page-hero {
  padding: 80px clamp(24px, 8vw, 120px) 60px;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  content: '';
  position: absolute;
  top: -60px; right: -60px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(0,212,255,0.06) 0%, transparent 70%);
  pointer-events: none;
}

/* ── Scrollbar ──────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ── Animations ─────────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes blink {
  0%, 100% { opacity: 1; } 50% { opacity: 0; }
}
.fade-up  { animation: fadeUp  0.7s ease both; }
.fade-in  { animation: fadeIn  0.7s ease both; }
.delay-1  { animation-delay: 0.1s; }
.delay-2  { animation-delay: 0.2s; }
.delay-3  { animation-delay: 0.35s; }
.delay-4  { animation-delay: 0.5s; }
.delay-5  { animation-delay: 0.65s; }

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    background: var(--bg);
    padding: 32px 24px;
    border-bottom: 1px solid var(--border);
    gap: 24px;
  }
  .nav-links.open a { font-size: 14px; }
  section { padding: 64px 24px; }
}