/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #080d14;
  --bg-card: #0e1521;
  --bg-card2: #111927;
  --border: #1e2d3d;
  --border-bright: #2a3f55;
  --text: #e2ecf7;
  --muted: #7a8fa6;
  --accent: #38bdf8;
  --accent2: #34d399;
  --accent3: #a78bfa;
  --glow: rgba(56,189,248,0.15);
  --font-sans: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}
html { scroll-behavior: smooth; }
body { background: var(--bg); color: var(--text); font-family: var(--font-sans); font-size: 16px; line-height: 1.75; min-height: 100vh; display: flex; flex-direction: column; }
a { color: var(--accent); text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.8; text-decoration: none; }

/* ── Header ── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(8,13,20,0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.header-inner { max-width: 1140px; margin: 0 auto; padding: 0 2rem; height: 70px; display: flex; align-items: center; gap: 2rem; }
.site-name {
  font-family: var(--font-mono); font-size: 1.05rem; font-weight: 600;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  white-space: nowrap; flex-shrink: 0;
}
.site-name:hover { opacity: 0.85; }
.site-nav { display: flex; gap: 0.25rem; margin-left: auto; align-items: center; }
.nav-link {
  font-size: 0.95rem; font-weight: 500; color: var(--muted);
  padding: 0.5rem 1.1rem;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
  letter-spacing: 0.02em;
  margin-bottom: -1px;
  display: inline-block;
}
.nav-link:hover { color: var(--text); border-bottom-color: var(--border-bright); opacity: 1; }
.nav-link.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }
.nav-toggle { display: none; background: none; border: none; color: var(--text); font-size: 1.6rem; cursor: pointer; margin-left: auto; }

/* ── Layout ── */
.site-content { max-width: 1140px; margin: 0 auto; padding: 4rem 2rem; width: 100%; flex: 1; animation: fadeIn 0.25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }

/* ── Footer ── */
.site-footer { border-top: 1px solid var(--border); text-align: center; padding: 1.75rem; color: var(--muted); font-size: 0.85rem; }

/* ── Home Hero ── */
.home-hero { display: flex; flex-direction: column; justify-content: center; min-height: 72vh; gap: 1.4rem; position: relative; }
.home-hero::before {
  content: ''; position: absolute; top: -80px; left: -60px; width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(56,189,248,0.07) 0%, transparent 70%);
  pointer-events: none;
}
.home-greeting { font-family: var(--font-mono); color: var(--accent2); font-size: 1rem; letter-spacing: 0.05em; }
.home-name {
  font-size: clamp(3rem, 7vw, 5rem); font-weight: 800; letter-spacing: -0.03em; line-height: 1.05;
  background: linear-gradient(135deg, #e2ecf7 0%, var(--accent) 50%, var(--accent2) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.home-tagline { font-size: 1.15rem; color: var(--muted); max-width: 560px; line-height: 1.8; }
.home-tagline .pill {
  display: inline-block; background: rgba(56,189,248,0.1); border: 1px solid rgba(56,189,248,0.25);
  color: var(--accent); font-size: 0.85rem; font-family: var(--font-mono);
  padding: 0.15rem 0.65rem; border-radius: 20px; margin: 0.15rem; vertical-align: middle;
}
.home-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 0.75rem; }

/* ── Buttons ── */
.btn { display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.7rem 1.6rem; border-radius: 8px; font-size: 0.9rem; font-weight: 600; transition: all 0.2s; cursor: pointer; border: none; font-family: var(--font-sans); letter-spacing: 0.02em; }
.btn:hover { transform: translateY(-2px); text-decoration: none; opacity: 1; }
.btn-primary { background: linear-gradient(135deg, var(--accent), #0ea5e9); color: #080d14; box-shadow: 0 4px 20px rgba(56,189,248,0.3); }
.btn-primary:hover { box-shadow: 0 6px 28px rgba(56,189,248,0.45); }
.btn-outline { background: transparent; color: var(--text); border: 1px solid var(--border-bright); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); background: rgba(56,189,248,0.06); }
.btn-ghost { background: transparent; color: var(--muted); border: 1px solid var(--border); font-size: 0.85rem; padding: 0.5rem 1.1rem; }
.btn-ghost:hover { color: var(--accent2); border-color: var(--accent2); background: rgba(52,211,153,0.06); }

/* ── Page Header ── */
.page-header { margin-bottom: 3rem; }
.page-header h1 { font-size: 2.2rem; font-weight: 800; letter-spacing: -0.02em; }
.page-header h1 span { background: linear-gradient(90deg, var(--accent), var(--accent2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.page-header p { color: var(--muted); margin-top: 0.5rem; font-size: 1.05rem; }

/* ── About ── */
.about-grid { display: grid; grid-template-columns: 3fr 2fr; gap: 3rem; }
.about-bio p { color: var(--muted); margin-bottom: 1.1rem; font-size: 1rem; }
.about-bio p strong { color: var(--text); font-weight: 600; }
.interests-box { background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; padding: 1.5rem; }
.interests-box h3 { font-family: var(--font-mono); font-size: 0.85rem; color: var(--accent); letter-spacing: 0.08em; margin-bottom: 1.1rem; }
.interests-list { list-style: none; display: flex; flex-direction: column; gap: 0.7rem; }
.interests-list li { display: flex; align-items: center; gap: 0.7rem; color: var(--muted); font-size: 0.92rem; transition: color 0.2s; }
.interests-list li:hover { color: var(--text); }
.interests-list li::before { content: "▸"; color: var(--accent2); flex-shrink: 0; font-size: 0.75rem; }

/* ── Skills ── */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.5rem; }
.skill-box { background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; padding: 1.4rem; transition: border-color 0.2s, transform 0.2s; }
.skill-box:hover { border-color: var(--border-bright); transform: translateY(-2px); }
.skill-box-title { font-family: var(--font-mono); font-size: 0.8rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 1rem; display: flex; align-items: center; gap: 0.5rem; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 0.45rem; }
.tag { font-size: 0.8rem; font-family: var(--font-mono); padding: 0.28rem 0.7rem; border-radius: 6px; font-weight: 500; transition: opacity 0.2s; }
.tag:hover { opacity: 0.8; }
.tag-blue   { background: rgba(56,189,248,0.1);  border: 1px solid rgba(56,189,248,0.25);  color: #7dd3fc; }
.tag-green  { background: rgba(52,211,153,0.1);  border: 1px solid rgba(52,211,153,0.25);  color: #6ee7b7; }
.tag-purple { background: rgba(167,139,250,0.1); border: 1px solid rgba(167,139,250,0.25); color: #c4b5fd; }
.tag-orange { background: rgba(251,146,60,0.1);  border: 1px solid rgba(251,146,60,0.25);  color: #fdba74; }
.tag-red    { background: rgba(248,113,113,0.1); border: 1px solid rgba(248,113,113,0.25); color: #fca5a5; }
.tag-cyan   { background: rgba(34,211,238,0.1);  border: 1px solid rgba(34,211,238,0.25);  color: #67e8f9; }

/* ── Projects ── */
.project-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; padding: 1.75rem; transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s; border-left: 3px solid transparent; margin-bottom: 1.5rem; }
.project-card:hover { border-color: var(--border-bright); border-left-color: var(--accent); transform: translateX(4px); box-shadow: -4px 0 20px rgba(56,189,248,0.08); }
.project-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.6rem; color: var(--text); display: flex; align-items: center; gap: 0.6rem; }
.project-card p { color: var(--muted); font-size: 0.9rem; line-height: 1.75; margin-bottom: 1rem; }
.project-card p strong { color: var(--text); font-weight: 600; }

/* ── Resume ── */
.resume-header { display: flex; align-items: flex-start; justify-content: space-between; flex-wrap: wrap; gap: 1rem; margin-bottom: 2rem; padding-bottom: 2rem; border-bottom: 1px solid var(--border); }
.resume-name { font-size: 1.9rem; font-weight: 800; letter-spacing: -0.02em; background: linear-gradient(90deg, var(--text), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.resume-title { color: var(--muted); font-size: 0.95rem; margin-top: 0.3rem; }
.resume-note { background: rgba(52,211,153,0.07); border: 1px solid rgba(52,211,153,0.2); border-radius: 8px; padding: 0.7rem 1rem; font-size: 0.85rem; color: var(--muted); margin-bottom: 2rem; }
.resume-note a { color: var(--accent2); }
.resume-section { margin-bottom: 2.5rem; }
.resume-section-title { font-family: var(--font-mono); font-size: 0.75rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); margin-bottom: 1.25rem; padding-bottom: 0.6rem; border-bottom: 1px solid var(--border); }

/* ── Timeline ── */
.timeline { position: relative; padding-left: 1.75rem; }
.timeline::before { content: ''; position: absolute; left: 0; top: 6px; bottom: 0; width: 2px; background: linear-gradient(to bottom, var(--accent), var(--border)); border-radius: 2px; }
.timeline-entry { position: relative; margin-bottom: 2rem; }
.timeline-entry::before { content: ''; position: absolute; left: -1.75rem; top: 6px; width: 10px; height: 10px; border-radius: 50%; background: var(--accent); border: 2px solid var(--bg); box-shadow: 0 0 0 2px var(--accent); }
.timeline-entry:last-child { margin-bottom: 0; }
.timeline-header { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.3rem; margin-bottom: 0.5rem; align-items: flex-start; }
.timeline-title { font-weight: 700; font-size: 1rem; color: var(--text); }
.timeline-org { color: var(--accent2); font-size: 0.9rem; font-weight: 500; }
.timeline-date { color: var(--muted); font-size: 0.8rem; font-family: var(--font-mono); background: var(--bg-card); padding: 0.2rem 0.6rem; border-radius: 20px; border: 1px solid var(--border); white-space: nowrap; }
.timeline-entry ul { padding-left: 1.1rem; color: var(--muted); font-size: 0.9rem; margin-top: 0.5rem; }
.timeline-entry ul li { margin-bottom: 0.4rem; line-height: 1.65; }
.timeline-entry ul li strong { color: var(--text); font-weight: 600; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none; position: absolute; top: 70px; left: 0; right: 0;
    background: rgba(8,13,20,0.98); border-bottom: 1px solid var(--border);
    flex-direction: column; padding: 1rem 1.5rem; gap: 0.25rem;
  }
  .site-nav.open { display: flex; }
  .resume-header { flex-direction: column; }
  .home-name { font-size: 2.8rem; }
  .site-content { padding: 2.5rem 1.25rem; }
}