:root {
  --bg: #0b1220;
  --bg-alt: #0e1626;
  --surface: #121b2e;
  --surface-2: #17223a;
  --border: #223050;
  --text: #e8edf7;
  --text-dim: #9fb0cc;
  --text-faint: #6b7c9c;
  --accent: #4fa3ff;
  --accent-2: #7ee0c3;
  --accent-soft: rgba(79, 163, 255, 0.12);
  --radius: 14px;
  --max: 1080px;
  --shadow: 0 20px 60px -30px rgba(0, 0, 0, 0.6);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fc;
    --bg-alt: #eef2f9;
    --surface: #ffffff;
    --surface-2: #f2f5fb;
    --border: #dde5f2;
    --text: #131c2e;
    --text-dim: #4b5972;
    --text-faint: #8091ab;
    --accent: #2b6fd6;
    --accent-2: #1f9c78;
    --accent-soft: rgba(43, 111, 214, 0.08);
    --shadow: 0 20px 60px -30px rgba(30, 40, 70, 0.25);
  }
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    radial-gradient(circle at 15% 10%, var(--accent-soft), transparent 45%),
    radial-gradient(circle at 85% 0%, rgba(126, 224, 195, 0.08), transparent 40%);
  pointer-events: none;
}

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

h1, h2, h3 { font-weight: 700; letter-spacing: -0.02em; margin: 0; }

ul { margin: 0; padding: 0; list-style: none; }

/* ---------- NAV ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.92rem;
}

.nav-links a { color: var(--text-dim); transition: color 0.15s ease; }
.nav-links a:hover { color: var(--text); }

.nav-cta {
  color: var(--bg) !important;
  background: var(--accent);
  padding: 8px 16px;
  border-radius: 999px;
  font-weight: 600;
}
.nav-cta:hover { color: var(--bg) !important; opacity: 0.9; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  display: block;
}

/* ---------- LAYOUT ---------- */
.section { padding: 96px 24px; }
.section-alt { background: var(--bg-alt); }
.section-inner { max-width: var(--max); margin: 0 auto; }

.section-tag {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0 0 12px;
}

.section h2 {
  font-size: clamp(1.6rem, 2.4vw, 2.1rem);
  margin-bottom: 44px;
  max-width: 640px;
}

/* ---------- HERO ---------- */
.hero {
  padding: 120px 24px 100px;
  border-bottom: 1px solid var(--border);
}

.hero-inner { max-width: var(--max); margin: 0 auto; }

.eyebrow {
  color: var(--accent-2);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin: 0 0 18px;
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4rem);
  margin-bottom: 14px;
}

.hero-title {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--text-dim);
  font-weight: 500;
  margin: 0 0 24px;
}

.hero-title .dot { color: var(--accent); margin: 0 6px; }

.hero-lead {
  max-width: 620px;
  color: var(--text-dim);
  font-size: 1.05rem;
  margin: 0 0 36px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.15s ease, opacity 0.15s ease, background 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--accent);
  color: #06101f;
}
.btn-primary:hover { opacity: 0.92; }

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  color: var(--text-faint);
  font-size: 0.9rem;
}
.hero-meta a { color: var(--text-dim); }
.hero-meta a:hover { color: var(--accent); }

/* ---------- ABOUT ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 56px;
  align-items: start;
}

.about-copy p {
  color: var(--text-dim);
  margin: 0 0 18px;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 18px;
}

.stat-num {
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 6px;
}

.stat-label {
  color: var(--text-faint);
  font-size: 0.85rem;
  line-height: 1.4;
}

/* ---------- EXPERIENCE ---------- */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.job {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 30px;
  box-shadow: var(--shadow);
}

.job-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin-bottom: 16px;
}

.job-head h3 { font-size: 1.15rem; margin-bottom: 3px; }

.job-org { color: var(--accent); font-weight: 600; font-size: 0.95rem; margin: 0; }

.job-meta {
  color: var(--text-faint);
  font-size: 0.85rem;
  white-space: nowrap;
  margin: 0;
}

.job ul { display: flex; flex-direction: column; gap: 9px; margin-bottom: 18px; }

.job li {
  position: relative;
  padding-left: 18px;
  color: var(--text-dim);
  font-size: 0.94rem;
}

.job li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent-2);
}

/* ---------- TAGS ---------- */
.tags { display: flex; flex-wrap: wrap; gap: 8px; }

.tags span {
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid transparent;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
}

/* ---------- CARDS / PROJECTS ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow);
}

.card h3 { font-size: 1.05rem; }

.card p { color: var(--text-dim); font-size: 0.92rem; margin: 0; flex-grow: 1; }

/* ---------- SKILLS ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 26px;
}

.skill-group h3 {
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 14px;
}

/* ---------- EDUCATION ---------- */
.edu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.edu-block h3 {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  margin-bottom: 20px;
}

.edu-title { font-weight: 700; font-size: 1.05rem; margin: 0 0 4px; }
.edu-sub { color: var(--accent); margin: 0 0 4px; font-size: 0.92rem; font-weight: 600; }
.edu-date { color: var(--text-faint); font-size: 0.85rem; margin: 0 0 12px; }
.edu-detail { color: var(--text-dim); font-size: 0.9rem; margin: 0; }

.cert-list { display: flex; flex-direction: column; gap: 14px; }
.cert-list li { color: var(--text-dim); font-size: 0.92rem; }
.cert-list strong { color: var(--text); }
.cert-progress { color: var(--text-faint); font-size: 0.85rem; }

/* ---------- CONTACT ---------- */
.contact { text-align: center; }
.contact .section-tag, .contact h2 { margin-left: auto; margin-right: auto; }
.contact h2 { margin-bottom: 16px; }

.contact-lead {
  color: var(--text-dim);
  max-width: 520px;
  margin: 0 auto 36px;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* ---------- FOOTER ---------- */
.footer {
  text-align: center;
  padding: 32px 24px 48px;
  color: var(--text-faint);
  font-size: 0.85rem;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 860px) {
  .about-grid, .edu-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    padding: 18px 24px 26px;
    gap: 18px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-cta { align-self: flex-start; }
  .hero { padding-top: 90px; }
  .job-head { flex-direction: column; }
  .job { padding: 22px; }
}