/* ─── Tokens ──────────────────────────────────────────────────── */
:root {
  --bg:          #0f0f0f;
  --surface:     #1a1a1a;
  --surface-2:   #222222;
  --border:      #2a2a2a;
  --accent:      #6366f1;
  --accent-dim:  rgba(99, 102, 241, 0.12);
  --accent-glow: rgba(99, 102, 241, 0.25);
  --text:        #f0f0f0;
  --muted:       #888888;
  --muted-2:     #555555;

  --font: 'Inter', system-ui, -apple-system, sans-serif;

  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  16px;

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast:  150ms;
  --dur-mid:   300ms;
  --dur-slow:  500ms;

  --max-w: 1100px;
  --section-gap: clamp(5rem, 8vw, 9rem);
}

/* ─── Reset ───────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
  -webkit-font-smoothing: antialiased;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.65;
  min-height: 100dvh;
}

img, svg { display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ─── Accessibility ───────────────────────────────────────────── */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 1rem;
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  z-index: 9999;
}
.skip-link:focus { left: 1rem; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

/* ─── Layout ──────────────────────────────────────────────────── */
.container {
  width: min(100%, var(--max-w));
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 3rem);
}

/* ─── Header / Nav ────────────────────────────────────────────── */
.site-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 100;
  background: rgba(15, 15, 15, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  width: min(100%, var(--max-w));
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 3rem);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted);
  transition: color var(--dur-fast);
}
.nav-links a:hover { color: var(--text); }

.nav-cta {
  border: 1px solid var(--border);
  padding: 0.4rem 0.875rem;
  border-radius: var(--radius-sm);
  transition: border-color var(--dur-fast), color var(--dur-fast) !important;
}
.nav-cta:hover {
  border-color: var(--accent) !important;
  color: var(--accent) !important;
}

/* ─── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  transition: opacity var(--dur-fast), transform var(--dur-fast), border-color var(--dur-fast);
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { opacity: 0.88; }

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--muted-2); }

/* ─── Hero ────────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding-block: 8rem 5rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 20% 30%, rgba(99,102,241,0.08) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 80% 70%, rgba(99,102,241,0.05) 0%, transparent 60%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.25rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #4ade80;
  box-shadow: 0 0 6px rgba(74,222,128,0.6);
  animation: pulse-dot 2.5s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

h1 {
  font-size: clamp(3rem, 7vw, 6.5rem);
  font-weight: 700;
  line-height: 1.0;
  letter-spacing: -0.03em;
  color: var(--text);
}

.hero-title {
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  font-weight: 400;
  color: var(--muted);
  letter-spacing: 0.01em;
}

.hero-sub {
  font-size: 0.875rem;
  color: var(--muted-2);
  letter-spacing: 0.04em;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.hero-location {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ─── Summary ─────────────────────────────────────────────────── */
.summary-section {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding-block: 3rem;
}

.summary-text {
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  color: var(--muted);
  line-height: 1.75;
  max-width: 72ch;
}

/* ─── Sections ────────────────────────────────────────────────── */
.section {
  padding-block: var(--section-gap);
}

.section-alt {
  background: var(--surface);
}

.section-eyebrow {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 2.5rem;
}

/* ─── Skills ──────────────────────────────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.skill-card {
  background: var(--surface);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  transition: background var(--dur-mid);
}
.skill-card:hover { background: var(--surface-2); }

.skill-card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.skill-icon {
  width: 18px;
  height: 18px;
  color: var(--accent);
  flex-shrink: 0;
}

.skill-card-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  transition: color var(--dur-fast), border-color var(--dur-fast);
}
.tag:hover {
  color: var(--text);
  border-color: var(--muted-2);
}

/* ─── Timeline ────────────────────────────────────────────────── */
.timeline {
  display: flex;
  flex-direction: column;
}

.timeline-item {
  display: grid;
  grid-template-columns: 1px 1fr;
  gap: 0 2rem;
  position: relative;
  padding-bottom: 3rem;
}
.timeline-item:last-child { padding-bottom: 0; }

.timeline-marker {
  position: relative;
  width: 1px;
  background: var(--border);
}
.timeline-marker::before {
  content: '';
  position: absolute;
  top: 0.35rem;
  left: 50%;
  transform: translateX(-50%);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--surface);
  box-shadow: 0 0 0 1px var(--accent);
}

.timeline-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.timeline-meta-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.timeline-role {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
}

.timeline-company {
  font-size: 0.825rem;
  color: var(--muted);
  margin-top: 0.2rem;
}

.timeline-date {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  white-space: nowrap;
  padding: 0.2rem 0.6rem;
  background: var(--accent-dim);
  border-radius: var(--radius-sm);
  align-self: flex-start;
}

.timeline-bullets {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.timeline-bullets li {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.6;
  padding-left: 1rem;
  position: relative;
}
.timeline-bullets li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--muted-2);
}

/* ─── Education ───────────────────────────────────────────────── */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.edu-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  transition: border-color var(--dur-mid), transform var(--dur-mid) var(--ease-out-expo);
}
.edu-card:hover {
  border-color: var(--muted-2);
  transform: translateY(-2px);
}

.edu-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
}
.edu-icon svg { width: 18px; height: 18px; }
.edu-icon--accent {
  color: var(--accent);
  background: var(--accent-dim);
  border-color: rgba(99,102,241,0.2);
}

.edu-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
  margin-bottom: 0.3rem;
}

.edu-org {
  font-size: 0.8rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.badge-progress {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
}

/* ─── Footer ──────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 2rem;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-name {
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-size: 0.8rem;
  color: var(--muted);
  transition: color var(--dur-fast);
}
.footer-links a:hover { color: var(--text); }

/* ─── Reveal animations ───────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity var(--dur-slow) var(--ease-out-expo),
    transform var(--dur-slow) var(--ease-out-expo);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 80ms; }
.reveal-delay-2 { transition-delay: 160ms; }
.reveal-delay-3 { transition-delay: 240ms; }
.reveal-delay-4 { transition-delay: 320ms; }

/* ─── Reduced motion ──────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .badge-dot { animation: none; }
  .btn:hover, .edu-card:hover { transform: none; }
}

/* ─── Responsive ──────────────────────────────────────────────── */
@media (max-width: 768px) {
  h1 { font-size: clamp(2.5rem, 12vw, 4rem); }

  .timeline-item { grid-template-columns: 1fr; }
  .timeline-marker { display: none; }
  .timeline-meta-row { flex-direction: column; }

  .skills-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .nav-links li:not(:last-child) { display: none; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .edu-grid { grid-template-columns: 1fr; }
}