:root {
  --bg: #0a0e17;
  --bg-alt: #111725;
  --card: #151c2c;
  --border: #26304a;
  --text: #e6ebf5;
  --muted: #93a1bd;
  --accent: #64ffda;
  --accent-2: #5b8cff;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  --radius: 16px;
  --max: 1080px;
}
[data-theme="light"] {
  --bg: #f6f8fc;
  --bg-alt: #ffffff;
  --card: #ffffff;
  --border: #e2e8f2;
  --text: #16202e;
  --muted: #5a6a83;
  --accent: #0ea882;
  --accent-2: #3b6ef0;
  --shadow: 0 12px 40px rgba(20, 40, 80, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
  transition: background .3s, color .3s;
}
.mono { font-family: 'JetBrains Mono', monospace; color: var(--accent); }
a { color: inherit; text-decoration: none; }
.ach-item a, .about-text a {
  color: var(--accent);
  border-bottom: 1px solid transparent;
  transition: border-color .2s, opacity .2s;
}
.ach-item a:hover, .about-text a:hover { border-bottom-color: var(--accent); opacity: .85; }

/* Nav */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem clamp(1rem, 5vw, 3rem);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, padding .3s;
}
.nav.scrolled { border-color: var(--border); padding-top: .7rem; padding-bottom: .7rem; }
.brand { font-weight: 800; font-size: 1.4rem; letter-spacing: -1px; }
.brand span { color: var(--accent); }
.nav-links { display: flex; gap: 1.6rem; }
.nav-links a { color: var(--muted); font-size: .93rem; font-weight: 500; position: relative; transition: color .2s; }
.nav-links a:hover { color: var(--accent); }
.nav-links a::after {
  content: ''; position: absolute; left: 0; bottom: -4px; width: 0; height: 2px;
  background: var(--accent); transition: width .25s;
}
.nav-links a:hover::after { width: 100%; }
.theme-toggle {
  background: var(--card); border: 1px solid var(--border); color: var(--text);
  width: 40px; height: 40px; border-radius: 10px; cursor: pointer; font-size: 1.1rem;
  transition: transform .2s, border-color .2s;
}
.theme-toggle:hover { transform: scale(1.08); border-color: var(--accent); }
.hamburger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; }
.hamburger span { width: 26px; height: 2px; background: var(--text); transition: .3s; }

/* Hero */
.hero {
  min-height: 100vh; display: flex; align-items: center; position: relative;
  padding: 0 clamp(1.2rem, 6vw, 4rem); overflow: hidden;
}
.hero-inner { max-width: var(--max); margin: 0 auto; width: 100%; z-index: 2; display: grid; grid-template-columns: 1.5fr 1fr; gap: 3rem; align-items: center; }
.hero-text { min-width: 0; }
.hero-photo { display: flex; justify-content: center; }
.hero-greeting { color: var(--accent); font-family: 'JetBrains Mono', monospace; font-size: 1rem; margin-bottom: 1rem; }
.hero-avatar {
  width: clamp(200px, 24vw, 300px); height: clamp(200px, 24vw, 300px);
  border-radius: 50%; object-fit: cover; object-position: center 20%;
  border: 4px solid var(--accent);
  box-shadow: 0 0 0 8px color-mix(in srgb, var(--accent) 12%, transparent), var(--shadow);
  transition: transform .3s;
}
.hero-avatar:hover { transform: scale(1.04); }
.hero-name {
  font-size: clamp(2.6rem, 8vw, 5.2rem); font-weight: 800; letter-spacing: -2px; line-height: 1.05;
  background: linear-gradient(120deg, var(--text), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-role { font-size: clamp(1.4rem, 5vw, 2.8rem); font-weight: 700; color: var(--muted); margin: .4rem 0 1.4rem; }
.hero-desc { max-width: 620px; color: var(--muted); font-size: 1.08rem; margin-bottom: 2rem; }
.hero-desc strong { color: var(--text); }
.hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 2.5rem; }
.btn {
  padding: .85rem 1.7rem; border-radius: 10px; font-weight: 600; font-size: .95rem;
  transition: transform .2s, box-shadow .2s, background .2s; cursor: pointer; display: inline-block;
}
.btn-primary { background: var(--accent); color: #05231b; }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 10px 25px color-mix(in srgb, var(--accent) 40%, transparent); }
.btn-ghost { border: 1px solid var(--accent); color: var(--accent); }
.btn-ghost:hover { background: color-mix(in srgb, var(--accent) 12%, transparent); transform: translateY(-3px); }
.hero-socials { display: flex; gap: 1.6rem; flex-wrap: wrap; font-family: 'JetBrains Mono', monospace; font-size: .9rem; }
.hero-socials a { color: var(--muted); transition: color .2s; }
.hero-socials a:hover { color: var(--accent); }
.hero-glow {
  position: absolute; top: 20%; right: -10%; width: 620px; height: 620px;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent-2) 22%, transparent), transparent 70%);
  filter: blur(40px); z-index: 1; pointer-events: none;
}

/* Sections */
.section { max-width: var(--max); margin: 0 auto; padding: 6rem clamp(1.2rem, 6vw, 2rem); }
.section-head { display: flex; align-items: center; gap: 1rem; margin-bottom: 3rem; }
.section-num { font-family: 'JetBrains Mono', monospace; color: var(--accent); font-size: 1.1rem; }
.section-head h2 { font-size: clamp(1.7rem, 5vw, 2.4rem); font-weight: 700; white-space: nowrap; }
.section-head::after { content: ''; height: 1px; background: var(--border); width: 100%; }

/* About */
.about-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 3rem; align-items: start; }
.about-text p { color: var(--muted); margin-bottom: 1.1rem; }
.about-text strong { color: var(--text); }
.about-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.stat-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.4rem; text-align: center; transition: transform .25s, border-color .25s;
}
.stat-card:hover { transform: translateY(-5px); border-color: var(--accent); }
.stat-num { display: block; font-size: 1.7rem; font-weight: 800; color: var(--accent); }
.stat-label { font-size: .82rem; color: var(--muted); }

/* Timeline */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before { content: ''; position: absolute; left: 6px; top: 6px; bottom: 6px; width: 2px; background: var(--border); }
.tl-item { position: relative; margin-bottom: 2.5rem; }
.tl-dot { position: absolute; left: -2rem; top: 6px; width: 14px; height: 14px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 20%, transparent); }
.tl-content { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.6rem 1.8rem; transition: border-color .25s, transform .25s; }
.tl-content:hover { border-color: var(--accent); transform: translateX(4px); }
.tl-top { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: .4rem; }
.tl-top h3 { font-size: 1.2rem; }
.tl-date { font-family: 'JetBrains Mono', monospace; font-size: .82rem; color: var(--accent); }
.tl-company { color: var(--muted); font-size: .92rem; margin: .2rem 0 .9rem; }
.tl-content ul { list-style: none; display: grid; gap: .6rem; }
.tl-content li { position: relative; padding-left: 1.3rem; color: var(--muted); font-size: .93rem; }
.tl-content li::before { content: '▹'; position: absolute; left: 0; color: var(--accent); }
.tl-content li strong { color: var(--text); }

/* Projects */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.6rem; }
.project-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.8rem; transition: transform .25s, border-color .25s, box-shadow .25s; }
.project-card:hover { transform: translateY(-8px); border-color: var(--accent); box-shadow: var(--shadow); }
.project-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.project-icon { font-size: 2rem; }
.project-date { font-family: 'JetBrains Mono', monospace; font-size: .8rem; color: var(--muted); }
.project-card h3 { font-size: 1.25rem; margin-bottom: .7rem; }
.project-card p { color: var(--muted); font-size: .93rem; margin-bottom: 1.2rem; }
.tags { display: flex; flex-wrap: wrap; gap: .5rem; }
.tags span { font-family: 'JetBrains Mono', monospace; font-size: .74rem; color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); padding: .25rem .6rem; border-radius: 6px; }

/* Skills */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.4rem; }
.skill-group { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; transition: border-color .25s; }
.skill-group:hover { border-color: var(--accent); }
.skill-group h3 { font-size: 1.05rem; margin-bottom: 1rem; color: var(--accent); }
.chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.chips span { font-size: .82rem; background: var(--bg-alt); border: 1px solid var(--border); padding: .35rem .75rem; border-radius: 8px; color: var(--muted); transition: color .2s, border-color .2s; }
.chips span:hover { color: var(--text); border-color: var(--accent); }

/* Achievements */
.ach-list { display: grid; gap: 1rem; }
.ach-item { display: flex; align-items: center; gap: 1rem; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.2rem 1.6rem; transition: transform .2s, border-color .2s; }
.ach-item:hover { transform: translateX(6px); border-color: var(--accent); }
.ach-item span { font-size: 1.6rem; }
.ach-item p { color: var(--muted); }
.ach-item strong { color: var(--text); }

/* Contact */
.contact { text-align: center; }
.contact .section-head { justify-content: center; }
.contact .section-head::after { display: none; }
.contact-inner p { max-width: 560px; margin: 0 auto 2rem; color: var(--muted); }
.contact-links { display: flex; justify-content: center; gap: 1.6rem; margin-top: 2rem; font-family: 'JetBrains Mono', monospace; font-size: .9rem; flex-wrap: wrap; }
.contact-links a { color: var(--muted); transition: color .2s; }
.contact-links a:hover { color: var(--accent); }

/* Footer */
.footer { text-align: center; padding: 2.5rem 1rem; border-top: 1px solid var(--border); color: var(--muted); font-size: .85rem; }

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* Responsive */
@media (max-width: 820px) {
  .nav-links {
    position: fixed; top: 0; right: 0; height: 100vh; width: 70%; max-width: 300px;
    flex-direction: column; justify-content: center; gap: 2rem; padding: 2rem;
    background: var(--bg-alt); border-left: 1px solid var(--border);
    transform: translateX(100%); transition: transform .3s; z-index: 90;
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links a { font-size: 1.1rem; }
  .hamburger { display: flex; z-index: 95; }
  .hero-inner { grid-template-columns: 1fr; text-align: center; gap: 2rem; }
  .hero-photo { order: -1; }
  .hero-cta, .hero-socials { justify-content: center; }
  .about-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .about-cards { grid-template-columns: 1fr; }
  .tl-content { padding: 1.2rem; }
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}