:root {
  --bg: #0a0e17;
  --bg-panel: #0f1420;
  --bg-panel-hover: #131a2a;
  --border: #1e2740;
  --text: #e8ecf5;
  --text-dim: #97a2ba;
  --text-faint: #5b6785;
  --cyan: #22d3ee;
  --violet: #a78bfa;
  --grad: linear-gradient(120deg, var(--cyan), var(--violet));
  --font-head: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --radius: 14px;
  --maxw: 1080px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3 { font-family: var(--font-head); font-weight: 600; letter-spacing: -0.01em; }

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

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

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Background grid */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(34,211,238,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34,211,238,0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 0%, transparent 70%);
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 23, 0.75);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-brand {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.25rem;
}
.nav-brand .dot { color: var(--cyan); }

.nav-links {
  display: flex;
  gap: 24px;
  margin-right: auto;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--text-dim);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s, border-color 0.2s;
  white-space: nowrap;
}
.btn-primary {
  background: var(--grad);
  color: #06111f;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(34,211,238,0.25); }

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.btn-text { color: var(--text-dim); padding: 12px 8px; }
.btn-text:hover { color: var(--cyan); }

/* Hero */
.hero {
  min-height: 88vh;
  display: flex;
  align-items: center;
  padding: 120px 24px 80px;
}
.hero-inner { max-width: var(--maxw); margin: 0 auto; width: 100%; }

.eyebrow {
  color: var(--cyan);
  font-family: var(--font-head);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.hero h1 {
  font-size: clamp(2.8rem, 8vw, 5.2rem);
  line-height: 1.02;
  margin-bottom: 20px;
}

.hero-role {
  font-family: var(--font-head);
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  color: var(--text-dim);
  margin-bottom: 24px;
}

.hero-lede {
  max-width: 640px;
  color: var(--text-dim);
  font-size: 1.05rem;
  margin-bottom: 36px;
}

.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 40px; }

.hero-links { display: flex; gap: 24px; }
.hero-links a { font-size: 0.9rem; color: var(--text-faint); border-bottom: 1px solid transparent; transition: color 0.2s, border-color 0.2s; }
.hero-links a:hover { color: var(--cyan); border-color: var(--cyan); }

/* Sections */
.section { padding: 100px 24px; border-top: 1px solid var(--border); }
.section-inner { max-width: var(--maxw); margin: 0 auto; }

.section-tag {
  font-family: var(--font-head);
  color: var(--cyan);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin-bottom: 32px;
}

.about-text { max-width: 720px; color: var(--text-dim); font-size: 1.05rem; }

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
  margin-bottom: 28px;
}
.skill-group h3 {
  font-size: 1rem;
  color: var(--text);
  margin-bottom: 14px;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 6px 14px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--text-dim);
  transition: border-color 0.2s, color 0.2s;
}
.chip:hover { border-color: var(--cyan); color: var(--text); }

.soft-skills { color: var(--text-faint); font-size: 0.9rem; padding-top: 8px; border-top: 1px solid var(--border); }

/* Timeline */
.timeline { position: relative; }
.timeline-item { position: relative; padding-left: 32px; }
.timeline-marker {
  position: absolute;
  left: 0;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--grad);
}
.timeline-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 4px;
}
.timeline-head h3 { font-size: 1.15rem; }
.timeline-date { color: var(--text-faint); font-size: 0.85rem; font-family: var(--font-head); }
.timeline-org { color: var(--cyan); font-size: 0.9rem; margin-bottom: 10px; }
.timeline-content p:last-child { color: var(--text-dim); max-width: 680px; }

/* Project cards */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}
.project-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.project-card:hover {
  transform: translateY(-4px);
  border-color: rgba(34,211,238,0.4);
  box-shadow: 0 12px 32px rgba(0,0,0,0.35);
}
.project-card.featured {
  grid-column: 1 / -1;
  background: linear-gradient(150deg, var(--bg-panel-hover), var(--bg-panel));
}
.project-card-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.project-title { font-family: var(--font-head); font-size: 1.15rem; }
.project-badge {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(34,211,238,0.1);
  color: var(--cyan);
  white-space: nowrap;
}
.project-desc { color: var(--text-dim); font-size: 0.94rem; flex-grow: 1; }
.project-stack { display: flex; flex-wrap: wrap; gap: 6px; }
.project-stack span {
  font-size: 0.72rem;
  color: var(--text-faint);
  border: 1px solid var(--border);
  padding: 3px 9px;
  border-radius: 999px;
}
.project-link {
  font-size: 0.88rem;
  color: var(--cyan);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 4px;
}
.project-link:hover { color: var(--violet); }
.project-link.disabled {
  color: var(--text-faint);
  pointer-events: none;
}

/* Hackathons */
.hackathons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.hackathon-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 0.25s, transform 0.25s;
}
.hackathon-card:hover { transform: translateY(-4px); border-color: rgba(167,139,250,0.4); }
.hackathon-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; margin-bottom: 6px; }
.hackathon-name { font-family: var(--font-head); font-size: 1.02rem; }
.hackathon-date { color: var(--text-faint); font-size: 0.8rem; }
.hackathon-result {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  color: #06111f;
  background: var(--grad);
  padding: 3px 12px;
  border-radius: 999px;
  margin-bottom: 10px;
}
.hackathon-desc { color: var(--text-dim); font-size: 0.9rem; }

/* Education */
.edu-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 16px;
}
.edu-courses { color: var(--text-dim); font-size: 0.9rem; }
.edu-volunteer p { color: var(--text-dim); font-size: 0.92rem; }

/* Contact */
.contact-lede { color: var(--text-dim); max-width: 560px; margin-bottom: 36px; }
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}
.contact-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: border-color 0.2s, transform 0.2s;
}
.contact-card:hover { border-color: var(--cyan); transform: translateY(-3px); }
.contact-label { font-size: 0.78rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.05em; }
.contact-value { font-family: var(--font-head); font-size: 1rem; }

/* Footer */
.footer {
  text-align: center;
  padding: 32px 24px;
  color: var(--text-faint);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* Responsive */
@media (max-width: 760px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-cv { display: none; }
  .section { padding: 72px 20px; }
  .hero { padding: 100px 20px 60px; min-height: auto; }
}

@media (max-width: 760px) {
  .nav-inner.open ~ main { }
  .nav.open .nav-links {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-panel);
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    gap: 16px;
  }
}