:root {
  --bg: #0b0d10;
  --panel: rgba(255, 255, 255, 0.06);
  --text: #e6e8eb;
  --muted: #a0a6ad;
  --primary: #6ea8fe;
  --accent: #8aefc5;
  --ring: rgba(110, 168, 254, 0.45);
  --shadow: rgba(0, 0, 0, 0.35);
}

[data-theme="light"] {
  --bg: #f7f8fa;
  --panel: #ffffff;
  --text: #121417;
  --muted: #5b6470;
  --primary: #2b66f6;
  --accent: #0fb77a;
  --ring: rgba(43, 102, 246, 0.25);
  --shadow: rgba(10, 20, 30, 0.08);
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, Segoe UI, Roboto, Inter, Arial, sans-serif;
  scroll-behavior: smooth;
}

.container { width: min(1100px, 92vw); margin: 0 auto; }
.section { padding: 72px 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(1.4) blur(8px);
  background: color-mix(in oklab, var(--bg) 85%, transparent);
  border-bottom: 1px solid color-mix(in oklab, var(--text) 12%, transparent);
}

.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { text-decoration: none; color: var(--text); font-weight: 700; letter-spacing: 0.2px; }

.nav-links { display: flex; gap: 20px; }
.nav-links a { color: var(--muted); text-decoration: none; font-weight: 500; }
.nav-links a:hover { color: var(--text); }

.nav-actions { display: flex; gap: 10px; }
.icon-btn {
  border: 1px solid color-mix(in oklab, var(--text) 15%, transparent);
  background: var(--panel);
  color: var(--text);
  border-radius: 10px;
  height: 36px; width: 40px;
  display: grid; place-items: center;
  cursor: pointer;
}

.hero { display: grid; align-items: center; min-height: 64svh; padding: 56px 0; }
.hero-text { max-width: 820px; }

/* New: hero headshot layout */
.hero-head {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 18px;
  align-items: center;
  margin-bottom: 10px;
}
.avatar { display: block; }
.avatar img {
  display: block;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid color-mix(in oklab, var(--text) 20%, transparent);
  box-shadow: 0 8px 22px var(--shadow);
}
@media (max-width: 600px) {
  .hero-head { grid-template-columns: 96px 1fr; }
  .avatar img { width: 96px; height: 96px; }
}

.gradient-text {
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.05;
  margin: 0 0 8px 0;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle { margin: 0 0 6px; color: var(--muted); font-weight: 600; }
.tagline { margin: 0 0 18px; color: var(--text); opacity: 0.9; }
.cta { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  appearance: none;
  border: 1px solid color-mix(in oklab, var(--text) 15%, transparent);
  background: var(--panel);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  box-shadow: 0 6px 18px var(--shadow);
  transition: transform .15s ease, background .2s ease, border-color .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn.primary {
  background: linear-gradient(135deg, color-mix(in oklab, var(--primary) 75%, #fff), color-mix(in oklab, var(--accent) 75%, #fff));
  color: #0b0d10;
  border-color: transparent;
}
.btn.ghost { background: transparent; }

.contact-inline {
  list-style: none;
  display: flex;
  gap: 16px;
  padding: 0;
  margin: 12px 0 0 0;
  flex-wrap: wrap;
}
.contact-inline a { color: var(--primary); text-decoration: none; }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 16px;
}
.card {
  background: var(--panel);
  border: 1px solid color-mix(in oklab, var(--text) 12%, transparent);
  border-radius: 16px;
  padding: 18px 18px;
  box-shadow: 0 10px 28px var(--shadow);
}
.skills-grid .card { grid-column: span 6; }
@media (max-width: 820px) { .skills-grid .card { grid-column: 1 / -1; } }

.badges { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.badges span {
  background: color-mix(in oklab, var(--panel) 75%, var(--text) 10%);
  border: 1px solid color-mix(in oklab, var(--text) 12%, transparent);
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 13px;
}

.timeline { position: relative; margin: 6px 0 0 0; display: grid; gap: 18px; }
.timeline-item { grid-template-columns: max-content 1fr; }
.timeline .time { white-space: nowrap; }
.timeline .content h3 { margin: 0 0 8px 0; }
.timeline .content ul { margin: 0; padding-left: 18px; }

.cards { display: grid; gap: 16px; grid-template-columns: repeat(12, 1fr); }
.cards .card { grid-column: span 6; }
@media (max-width: 820px) { .cards .card { grid-column: 1 / -1; } }

.edu { list-style: none; padding: 0; display: grid; gap: 16px; }

.contact-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 16px; }
.contact-card {
  grid-column: span 4;
  background: var(--panel);
  border: 1px solid color-mix(in oklab, var(--text) 12%, transparent);
  border-radius: 12px;
  padding: 14px 16px;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  text-align: center;
}
@media (max-width: 820px) { .contact-card { grid-column: 1 / -1; } }

.site-footer {
  padding: 36px 0 60px;
  color: var(--muted);
  text-align: center;
  border-top: 1px solid color-mix(in oklab, var(--text) 12%, transparent);
}

/* Mobile nav */
#menu-toggle { display: none; }
@media (max-width: 860px) {
  #menu-toggle { display: grid; }
  .nav-links {
    position: fixed;
    inset: 64px 0 auto 0;
    background: var(--bg);
    border-bottom: 1px solid color-mix(in oklab, var(--text) 12%, transparent);
    display: none;
    flex-direction: column;
    padding: 12px;
  }
  .nav-links.open { display: flex; }
}

/* Optional: mobile stacking to avoid overflow on very narrow screens */
@media (max-width: 640px) {
  .timeline-item {
    grid-template-columns: 1fr;  /* stack date above content */
  }
  .timeline .time {
    white-space: normal;         /* allow wrap when stacked */
    font-weight: 600;
    margin-bottom: 6px;
  }
}

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity .5s ease, transform .5s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }