/* ================================================================
   ADIL OSMAN — SHARED STYLESHEET
   Design direction: Signal & Structure
   ================================================================ */

/* ── Design tokens ── */
:root {
  --bg:           #1a1b1e;
  --bg-surface:   #1f2026;
  --bg-elevated:  #262830;
  --border:       #2e3040;
  --border-hover: #404460;

  --text-primary:   #eef0f6;
  --text-secondary: #8892b0;
  --text-tertiary:  #4e5578;

  --accent:     #4a9eff;
  --accent-dim: rgba(74,158,255,0.10);
  --accent-mid: rgba(74,158,255,0.30);

  --font-display: 'Fraunces', Georgia, serif;
  --font-body:    'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:    'JetBrains Mono', 'Fira Code', monospace;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);

  --max-width: 1080px;
  --nav-h: 64px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; }
img, svg { display: block; }
::selection { background: var(--accent-dim); color: var(--accent); }
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border-hover); border-radius: 3px; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ── Layout ── */
.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}
section { padding: 7rem 0; }
.alt-bg {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* ── Typography ── */
.section-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.625rem;
}
.section-label::after {
  content: '';
  display: block;
  height: 1px;
  width: 40px;
  background: var(--accent-mid);
}
.section-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
}
.section-title em { font-style: italic; color: var(--accent); }
.section-sub {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-top: 0.75rem;
  line-height: 1.7;
  max-width: 480px;
}
.section-head { margin-bottom: 3.5rem; }

/* ── Scroll reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.65s var(--ease-out), transform 0.65s var(--ease-out);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.d1 { transition-delay: 0.08s; }
.d2 { transition-delay: 0.16s; }
.d3 { transition-delay: 0.24s; }
.d4 { transition-delay: 0.32s; }

/* ── Badges ── */
.badge {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

/* ── Buttons ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent);
  color: #ffffff;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  border: none;
  letter-spacing: 0.01em;
  transition: opacity 0.15s ease, transform 0.15s ease;
}
.btn-primary:hover { opacity: 0.88; transform: translateY(-2px); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}
.btn-ghost:hover { color: var(--text-primary); border-color: var(--border-hover); transform: translateY(-2px); }

.btn-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent);
  transition: gap 0.15s ease;
}
.btn-link:hover { gap: 0.65rem; }

/* ── Navigation ── */
#nav {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--nav-h);
  z-index: 200;
  transition: background 0.4s ease, border-color 0.4s ease;
  border-bottom: 1px solid transparent;
}
#nav.scrolled {
  background: rgba(26,27,30,0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-color: var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}
.nav-logo {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.12em;
  font-weight: 500;
  color: var(--text-primary);
}
.nav-logo em { font-style: normal; color: var(--accent); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 2.25rem;
  list-style: none;
}
.nav-links a {
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--text-secondary);
  transition: color 0.15s ease;
  letter-spacing: 0.01em;
  position: relative;
}
.nav-links a:hover { color: var(--text-primary); }
.nav-links a.active {
  color: var(--text-primary);
}
.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0; right: 0;
  height: 1px;
  background: var(--accent);
}
.nav-cta {
  font-family: var(--font-mono) !important;
  font-size: 0.7rem !important;
  letter-spacing: 0.1em !important;
  color: var(--accent) !important;
  border: 1px solid var(--accent-mid);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-sm);
  transition: background 0.15s ease !important;
}
.nav-cta:hover { background: var(--accent-dim) !important; }
.nav-cta.active::after { display: none; }
.nav-cta.active { background: var(--accent-dim) !important; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text-primary);
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
}
.foot-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.foot-copy {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
}
.foot-copy span { color: var(--accent); }
.foot-links { display: flex; gap: 1.5rem; }
.foot-links a {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  transition: color 0.15s ease;
}
.foot-links a:hover { color: var(--text-secondary); }

/* ── Project cards ── */
.pcard {
  display: block;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.875rem;
  position: relative;
  overflow: hidden;
  transition: border-color 0.25s var(--ease-out), transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out);
}
.pcard::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(140deg, var(--accent-dim) 0%, transparent 55%);
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}
.pcard:hover { border-color: var(--border-hover); transform: translateY(-4px); box-shadow: 0 24px 64px rgba(0,0,0,0.45); }
.pcard:hover::before { opacity: 1; }
.pcard.wide { grid-column: span 2; }
.pcard-top { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 1.25rem; }
.pcard-tag {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.22rem 0.65rem;
  border-radius: 100px;
}
.pcard-arrow {
  width: 18px; height: 18px;
  color: var(--text-tertiary);
  flex-shrink: 0;
  transition: color 0.15s ease, transform 0.15s ease;
}
.pcard:hover .pcard-arrow { color: var(--accent); transform: translate(2px,-2px); }
.pcard-title {
  font-family: var(--font-display);
  font-size: 1.3125rem;
  font-weight: 300;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  margin-bottom: 0.625rem;
  line-height: 1.25;
}
.pcard-desc { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.65; margin-bottom: 1.5rem; }
.pcard-stack { display: flex; flex-wrap: wrap; gap: 0.375rem; }
.pcard.hidden { opacity: 0.2; pointer-events: none; transform: scale(0.98); transition: opacity 0.3s ease, transform 0.3s ease; }

/* ── Contact links ── */
.clink {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem 1.125rem;
  transition: border-color 0.18s ease, background 0.18s ease, transform 0.18s ease;
}
.clink:hover { border-color: var(--accent-mid); background: var(--accent-dim); transform: translateX(4px); }
.clink-icon {
  width: 34px; height: 34px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.clink-icon svg { width: 15px; height: 15px; color: var(--text-secondary); }
.clink-info { flex: 1; }
.clink-label { font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-tertiary); margin-bottom: 0.2rem; }
.clink-val { font-size: 0.875rem; font-weight: 500; color: var(--text-primary); }
.clink-arrow { width: 13px; height: 13px; color: var(--text-tertiary); transition: color 0.15s ease, transform 0.15s ease; flex-shrink: 0; }
.clink:hover .clink-arrow { color: var(--accent); transform: translateX(3px); }

/* ── Timeline ── */
.timeline { padding-left: 1.75rem; position: relative; }
.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 10px; bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent-mid) 0%, var(--border) 60%, transparent 100%);
}
.titem { position: relative; padding-bottom: 3rem; margin-bottom: 3rem; border-bottom: 1px solid var(--border); }
.titem:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.titem-dot {
  position: absolute;
  left: -2.2rem; top: 7px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 2px var(--accent-mid);
}
.titem-period { font-family: var(--font-mono); font-size: 0.67rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-tertiary); margin-bottom: 0.5rem; }
.titem-title { font-size: 1.125rem; font-weight: 500; color: var(--text-primary); margin-bottom: 0.25rem; }
.titem-org { font-size: 0.875rem; color: var(--accent); margin-bottom: 0.875rem; }
.titem-body { font-size: 0.9375rem; color: var(--text-secondary); line-height: 1.75; }
.titem-tags { display: flex; flex-wrap: wrap; gap: 0.375rem; margin-top: 1rem; }

/* ── Skill groups ── */
.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.125rem; }
.skill-group {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.625rem;
  transition: border-color 0.2s ease;
}
.skill-group:hover { border-color: var(--border-hover); }
.sg-num { font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.15em; color: var(--accent); text-transform: uppercase; margin-bottom: 0.875rem; }
.sg-title { font-size: 0.9375rem; font-weight: 500; color: var(--text-primary); margin-bottom: 1rem; }
.sg-items { display: flex; flex-direction: column; gap: 0.45rem; }
.sg-item { display: flex; align-items: center; gap: 0.6rem; font-size: 0.875rem; color: var(--text-secondary); }
.sg-dot { width: 3px; height: 3px; border-radius: 50%; background: var(--text-tertiary); flex-shrink: 0; }

/* ── Filter row ── */
.filter-row { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 2.75rem; }
.filter-btn {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  background: none;
  border: 1px solid var(--border);
  padding: 0.35rem 0.875rem;
  border-radius: 100px;
  transition: all 0.18s ease;
}
.filter-btn:hover { color: var(--text-secondary); border-color: var(--border-hover); }
.filter-btn.active { color: var(--accent); border-color: var(--accent-mid); background: var(--accent-dim); }

/* ── Avatar card ── */
.avatar-card { background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; }
.avatar-inner {
  aspect-ratio: 4/5;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(145deg, var(--bg-elevated), var(--bg-surface));
  position: relative;
}
.avatar-initials { font-family: var(--font-display); font-size: 5.5rem; font-weight: 300; font-style: italic; color: rgba(74,158,255,0.15); user-select: none; }
.avatar-grid-overlay {
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 24px 24px;
}
.avatar-foot { padding: 1rem 1.25rem; border-top: 1px solid var(--border); }
.avatar-name { font-size: 0.9375rem; font-weight: 500; color: var(--text-primary); }
.avatar-role-tag { font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); margin-top: 0.2rem; }

/* ── Open badge ── */
.open-badge { display: inline-flex; align-items: center; gap: 0.5rem; font-size: 0.8125rem; color: var(--text-secondary); }
.open-dot { width: 7px; height: 7px; border-radius: 50%; background: #4ade80; animation: pulseGreen 2.5s ease-in-out infinite; flex-shrink: 0; }
@keyframes pulseGreen {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(74,222,128,0.4); }
  50% { opacity: 0.7; box-shadow: 0 0 0 4px rgba(74,222,128,0); }
}

/* ── Writing stub ── */
.writing-stub {
  border: 1px dashed var(--border-hover);
  border-radius: var(--radius-lg);
  padding: 3.5rem 2rem;
  text-align: center;
  background: var(--bg-elevated);
}
.writing-stub-icon {
  width: 44px; height: 44px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-mid);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 1.5rem;
}
.writing-stub h3 { font-family: var(--font-display); font-size: 1.375rem; font-weight: 300; color: var(--text-primary); margin-bottom: 0.625rem; }
.writing-stub p { font-size: 0.9375rem; color: var(--text-secondary); max-width: 420px; margin: 0 auto; line-height: 1.65; }
.writing-topics { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.5rem; margin-top: 1.5rem; }

/* ── Page hero (inner pages) ── */
.page-hero {
  padding: calc(var(--nav-h) + 4rem) 0 4rem;
  border-bottom: 1px solid var(--border);
}
.page-hero-label { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); margin-bottom: 1rem; }
.page-hero-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1.0;
  letter-spacing: -0.03em;
}
.page-hero-title em { font-style: italic; color: var(--accent); }
.page-hero-sub { font-size: 1.0625rem; color: var(--text-secondary); max-width: 500px; line-height: 1.7; margin-top: 1rem; }

/* ── Responsive ── */
@media (max-width: 900px) {
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .pcard.wide { grid-column: span 1; }
}

@media (max-width: 640px) {
  :root { --nav-h: 56px; }
  section { padding: 5rem 0; }
  .wrap { padding: 0 1.25rem; }
  .section-title { font-size: 1.875rem; }
  .page-hero { padding: calc(var(--nav-h) + 2.5rem) 0 2.5rem; }
  .skills-grid { grid-template-columns: 1fr; }
  .foot-inner { flex-direction: column; gap: 1rem; text-align: center; }

  .nav-links {
    display: none;
    position: fixed;
    inset: var(--nav-h) 0 0 0;
    background: rgba(9,9,15,0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
  }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 1.125rem; }
  .hamburger { display: flex; }
}