/* ---------- Design tokens ---------- */
:root {
  --bg: #0b0e14;
  --bg-elevated: #121722;
  --bg-card: #151b28;
  --border: #232b3b;
  --text: #e9edf5;
  --text-dim: #9aa5b8;
  --text-faint: #626e84;
  --accent: #1b63c0;
  --accent-strong: #0d0b7f;
  --accent-soft: #2d78da3b;
  --danger-glow: rgba(10, 65, 182, 0.25);
  --radius: 14px;
  --max-width: 1080px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fb;
    --bg-elevated: #ffffff;
    --bg-card: #ffffff;
    --border: #e3e7ef;
    --text: #161a23;
    --text-dim: #565f70;
    --text-faint: #8891a1;
    --accent: #460f9d;
    --accent-strong: #370b7f;
    --accent-soft: rgba(15, 157, 142, 0.1);
  }
}

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

.noise-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(circle at 15% 10%, var(--accent-soft), transparent 45%),
    radial-gradient(circle at 85% 30%, var(--accent-soft), transparent 40%);
  opacity: .8;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
}

.brand-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
  transition: border-color .15s ease;
}

.brand-avatar:hover {
  border-color: var(--accent);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 32px;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-links a {
  font-size: 0.92rem;
  color: var(--text-dim);
  transition: color .15s ease;
}
.nav-links a:hover { color: var(--text); }

.nav-cta {
  color: var(--accent) !important;
  border: 1px solid var(--accent);
  padding: 7px 16px;
  border-radius: 999px;
}
.nav-cta:hover { background: var(--accent-soft); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  z-index: 1;
  padding: 110px 24px 90px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 18px;
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 22px;
  font-weight: 700;
}

.text-accent { color: var(--accent); }

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 0 28px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 34px;
}

.meta-chip {
  font-size: 0.85rem;
  color: var(--text-dim);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: 6px 14px;
  border-radius: 999px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: #04201c;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px -8px var(--danger-glow);
}
.btn-ghost {
  border-color: var(--border);
  color: var(--text);
  background: var(--bg-elevated);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hero-links {
  display: flex;
  gap: 18px;
}
.hero-links a {
  color: var(--text-faint);
  transition: color .15s ease, transform .15s ease;
}
.hero-links a:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

/* ---------- Sections ---------- */
.section {
  position: relative;
  z-index: 1;
  padding: 70px 24px;
  border-top: 1px solid var(--border);
}

.section-title {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  letter-spacing: -0.02em;
  margin: 0 0 40px;
}

.section-index {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px 9px;
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text p {
  color: var(--text-dim);
  margin: 0 0 18px;
  max-width: 620px;
}

.interests {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
}

.tag {
  font-size: 0.8rem;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-dim);
}

.about-stats {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}

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

/* ---------- Timeline (Experience) ---------- */
.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 24px;
  position: relative;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 26px;
  bottom: -36px;
  width: 1px;
  background: var(--border);
}

.timeline-item:last-child::before { display: none; }

.timeline-marker {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 2px solid var(--accent);
  margin-top: 4px;
  position: relative;
}
.timeline-marker::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: var(--accent);
}

.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
}

.timeline-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 4px;
}

.timeline-head h3 {
  margin: 0;
  font-size: 1.2rem;
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-faint);
  white-space: nowrap;
}

.timeline-org {
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 16px;
  font-size: 0.95rem;
}

.timeline-list {
  margin: 0;
  padding-left: 20px;
  color: var(--text-dim);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.timeline-list li::marker { color: var(--accent); }
.timeline-list strong { color: var(--text); }

/* ---------- Projects ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
  display: flex;
  flex-direction: column;
}

.project-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px 12px;
  margin-bottom: 6px;
}

.project-head h3 {
  margin: 0;
  font-size: 1.1rem;
}

.project-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-faint);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 10px;
  white-space: nowrap;
}

.project-role {
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 14px;
  font-size: 0.9rem;
}

.project-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.project-stack span {
  font-size: 0.78rem;
  padding: 5px 11px;
  border-radius: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-dim);
}

.project-desc {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.92rem;
}

/* ---------- Skills ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.skill-card h3 {
  margin: 0 0 16px;
  font-size: 1rem;
  color: var(--accent);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-tags span {
  font-size: 0.8rem;
  padding: 5px 11px;
  border-radius: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-dim);
}

/* ---------- Education ---------- */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
}

.edu-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 4px;
}

.edu-head h3 { margin: 0; font-size: 1.15rem; }

/* ---------- Contact ---------- */
.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 44px;
  text-align: center;
}

.contact-card p {
  color: var(--text-dim);
  max-width: 520px;
  margin: 0 auto 28px;
  font-size: 1.05rem;
}

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

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  color: var(--text-faint);
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- Reveal animation ---------- */
.section, .hero {
  opacity: 0;
  transform: translateY(16px);
  animation: reveal .6s ease forwards;
}
.hero { animation-delay: .05s; }

@keyframes reveal {
  to { opacity: 1; transform: translateY(0); }
}

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

@media (max-width: 720px) {
  .nav-toggle { display: flex; }

  .nav-links {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 24px;
    gap: 18px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity .18s ease, transform .18s ease;
  }

  .nav-links.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .timeline-item { grid-template-columns: 16px 1fr; gap: 16px; }
  .timeline-content { padding: 20px; }
  .contact-card { padding: 30px 22px; }
}