:root{
  --bg: #0b0d10;
  --bg-elevated: #14171b;
  --border: #23272e;
  --text-primary: #e4e6eb;
  --text-secondary: #8a919e;
  --text-tertiary: #565d68;
  --accent: #ffb454;
  --accent-dim: rgba(255,180,84,0.12);
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --font-body: 'Inter', -apple-system, sans-serif;
  --sidebar-w: 340px;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin:0;
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

::selection{ background: var(--accent-dim); color: var(--accent); }

/* ---------- Sidebar ---------- */
.sidebar{
  position: fixed;
  top:0; left:0;
  width: var(--sidebar-w);
  height: 100vh;
  padding: 56px 48px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-right: 1px solid var(--border);
}

.brand{ display:flex; align-items:center; gap:10px; margin-bottom:18px; }
.brand-mark{ font-family: var(--font-mono); color: var(--accent); font-weight:700; font-size:18px; }
.brand-name{ font-family: var(--font-mono); font-weight:700; font-size:20px; letter-spacing:-0.02em; }

.role{ font-family: var(--font-mono); font-size:13px; color: var(--accent); margin:0 0 16px; letter-spacing: 0.02em; }
.tagline{ color: var(--text-secondary); font-size:15px; max-width: 30ch; }

.side-nav ul{ list-style:none; padding:0; margin: 40px 0 0; }
.side-nav li{ margin-bottom: 6px; }
.nav-link{
  display:flex; align-items:center; gap:12px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-tertiary);
  padding: 8px 0;
  transition: color .2s ease;
}
.nl-line{ width:24px; height:1px; background: var(--text-tertiary); transition: all .2s ease; }
.nav-link:hover{ color: var(--text-primary); }
.nav-link:hover .nl-line{ background: var(--text-primary); width:32px; }
.nav-link.active{ color: var(--accent); }
.nav-link.active .nl-line{ background: var(--accent); width:32px; }

.socials{ list-style:none; display:flex; gap:20px; padding:0; margin:0; font-family: var(--font-mono); font-size:12px; }
.socials a{ color: var(--text-tertiary); transition: color .2s ease; }
.socials a:hover{ color: var(--accent); }

/* ---------- Nav toggle (mobile) ---------- */
.nav-toggle{
  display:none;
  position: fixed; top: 20px; right: 20px; z-index: 100;
  width: 44px; height: 44px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  flex-direction: column; align-items:center; justify-content:center; gap:4px;
  cursor:pointer;
}
.nav-toggle span{ width: 18px; height: 2px; background: var(--text-primary); transition: all .2s ease; }

/* ---------- Main content ---------- */
main{
  margin-left: var(--sidebar-w);
  max-width: 720px;
  padding: 0 48px;
}

.hero{
  min-height: 100vh;
  display:flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 40px;
}
.eyebrow{ font-family: var(--font-mono); color: var(--accent); font-size:13px; margin:0 0 18px; }
.hero h1{ font-size: clamp(36px, 5vw, 54px); margin: 0 0 12px; letter-spacing:-0.02em; }
.accent{ color: var(--accent); }
.hero-sub{ font-family: var(--font-mono); font-size:18px; color: var(--text-secondary); min-height: 28px; margin: 0 0 20px; }
.cursor{ display:inline-block; width:9px; background: var(--accent); animation: blink 1s step-end infinite; }
@keyframes blink{ 50%{ opacity:0; } }
.hero-desc{ color: var(--text-secondary); font-size:17px; max-width: 52ch; margin: 0 0 36px; }

.btn-primary{
  display:inline-flex; align-items:center; gap:8px;
  font-family: var(--font-mono); font-size:14px; font-weight:600;
  color: var(--bg); background: var(--accent);
  padding: 14px 26px; border-radius: 6px; width: fit-content;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn-primary:hover{ transform: translateY(-2px); box-shadow: 0 10px 24px -8px var(--accent-dim); }

.section{ padding: 110px 0; border-top: 1px solid var(--border); }
.section h2{
  display:flex; align-items:baseline; gap:14px;
  font-size: 26px; margin: 0 0 32px; letter-spacing:-0.01em;
}
.section-num{ font-family: var(--font-mono); font-size:15px; color: var(--accent); font-weight:600; }
.section-body p{ color: var(--text-secondary); font-size:16px; max-width: 62ch; }

.tech-grid{
  list-style:none; padding:0; margin: 28px 0 0;
  display:grid; grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 10px 24px;
  font-family: var(--font-mono); font-size: 14px; color: var(--text-secondary);
}
.tech-grid li::before{ content:"▸ "; color: var(--accent); }

/* ---------- Experience ---------- */
.timeline-item{
  display:grid; grid-template-columns: 140px 1fr; gap: 24px;
  padding: 24px 0; border-bottom: 1px solid var(--border);
}
.timeline-item:last-child{ border-bottom:none; }
.ti-date{ font-family: var(--font-mono); font-size:13px; color: var(--text-tertiary); padding-top:3px; }
.ti-content h3{ margin:0 0 8px; font-size:17px; font-weight:600; }
.ti-company{ color: var(--accent); font-weight:400; }
.ti-content p{ margin:0; color: var(--text-secondary); font-size:15px; }

/* ---------- Projects ---------- */
.project-grid{ display:grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 18px; }
.project-card{
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  transition: transform .18s ease, border-color .18s ease;
  display:flex; flex-direction:column;
}
.project-card:hover{ transform: translateY(-4px); border-color: var(--accent); }
.pc-head{ display:flex; justify-content:space-between; align-items:center; margin-bottom:16px; }
.pc-icon{ font-family: var(--font-mono); color: var(--accent); font-size:15px; }
.pc-arrow{ color: var(--text-tertiary); transition: transform .18s ease, color .18s ease; }
.project-card:hover .pc-arrow{ transform: translate(2px,-2px); color: var(--accent); }
.project-card h3{ margin: 0 0 8px; font-size:17px; }
.project-card p{ margin:0 0 18px; color: var(--text-secondary); font-size:14px; flex-grow:1; }
.pc-tags{ display:flex; gap:8px; flex-wrap:wrap; }
.pc-tags span{ font-family: var(--font-mono); font-size:11px; color: var(--accent); background: var(--accent-dim); padding:4px 8px; border-radius:4px; }

.contact-body{ display:flex; flex-direction:column; align-items:flex-start; gap:24px; }

.footer{ padding: 40px 0 80px; color: var(--text-tertiary); font-family: var(--font-mono); font-size:13px; }

/* ---------- Scroll reveal ---------- */
.section, .hero{ opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.section.in-view, .hero.in-view{ opacity: 1; transform: translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 900px){
  .sidebar{
    width: 100%; height: auto; position: fixed; top:0; left:0;
    transform: translateX(-100%);
    transition: transform .25s ease;
    z-index: 90;
    background: var(--bg);
  }
  .sidebar.open{ transform: translateX(0); }
  .nav-toggle{ display:flex; }
  main{ margin-left:0; padding: 0 24px; max-width: 100%; }
  .project-grid{ grid-template-columns: 1fr; }
  .tech-grid{ grid-template-columns: repeat(2,1fr); }
  .timeline-item{ grid-template-columns: 1fr; gap:8px; }
}

@media (prefers-reduced-motion: reduce){
  *{ animation: none !important; transition: none !important; }
  html{ scroll-behavior: auto; }
}