/* ============================================================
   BASE & CUSTOM PROPERTIES
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #0d0f14;
  --bg-alt:      #111520;
  --surface:     #161b27;
  --surface-2:   #1e2638;
  --border:      rgba(255,255,255,.07);
  --text:        #e2e8f0;
  --text-muted:  #8893a8;
  --accent:      #6366f1;
  --accent-dim:  rgba(99,102,241,.15);
  --accent-glow: rgba(99,102,241,.35);

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --radius-sm:  6px;
  --radius:     12px;
  --radius-lg:  20px;

  --nav-h: 68px;
  --section-gap: 7rem;
  --max-w: 1100px;

  --ease: cubic-bezier(.16,1,.3,1);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--accent); color: #fff; }

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

/* ============================================================
   TYPOGRAPHY HELPERS
   ============================================================ */
.accent { color: var(--accent); }

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
  width: min(var(--max-w), 100% - 2.5rem);
  margin-inline: auto;
}

/* ============================================================
   SCROLL REVEAL ANIMATIONS
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.visible {
  opacity: 1;
  transform: none;
}
.reveal-delay { transition-delay: .18s; }

/* ============================================================
   NAVIGATION
   ============================================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  transition: background .3s, box-shadow .3s, backdrop-filter .3s;
}
.site-header.scrolled {
  background: rgba(13,15,20,.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--border);
}

.nav {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.nav-logo {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1;
}
.nav-logo .accent { font-size: 2rem; }

.nav-links {
  display: flex;
  gap: .25rem;
}
.nav-links a {
  padding: .45rem .75rem;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color .2s, background .2s;
}
.nav-links a:hover { color: var(--text); background: var(--surface); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: .5rem;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .3s var(--ease), opacity .3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: .9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform .2s var(--ease), box-shadow .2s, background .2s, color .2s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 24px var(--accent-glow);
}
.btn-primary:hover { box-shadow: 0 8px 32px var(--accent-glow); }

.btn-ghost {
  border: 1.5px solid var(--border);
  color: var(--text-muted);
  background: transparent;
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-block: calc(var(--nav-h) + 4rem) 6rem;
  position: relative;
  overflow: hidden;
}

/* subtle radial glow behind hero */
.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  left: 50%;
  translate: -50% 0;
  width: 800px; height: 600px;
  background: radial-gradient(ellipse at center, rgba(99,102,241,.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-greeting {
  display: block;
  font-family: var(--font-mono);
  font-size: .875rem;
  color: var(--accent);
  margin-bottom: .75rem;
  letter-spacing: .08em;
}

.hero-name {
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: 700;
  letter-spacing: -.03em;
  line-height: 1.05;
  background: linear-gradient(135deg, #fff 40%, #8893a8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 400;
  color: var(--text-muted);
  margin-top: .5rem;
  margin-bottom: 1.5rem;
}

.hero-sub {
  color: var(--text-muted);
  max-width: 480px;
  margin-bottom: 2.5rem;
}

.hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; }

/* Code block decoration */
.code-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: .8125rem;
  line-height: 1.65;
  box-shadow: 0 24px 64px rgba(0,0,0,.4), 0 0 0 1px rgba(255,255,255,.04);
}
.code-header {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .75rem 1rem;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}
.dot {
  width: 12px; height: 12px;
  border-radius: 50%;
}
.dot-red    { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green  { background: #27c93f; }
.code-file {
  margin-left: .5rem;
  color: var(--text-muted);
  font-size: .75rem;
}
.code-block pre {
  padding: 1.5rem;
  overflow-x: auto;
}
.code-block code { white-space: pre; }

.kw   { color: #c792ea; }
.var  { color: #82aaff; }
.prop { color: #f07178; }
.str  { color: #c3e88d; }
.bool { color: #ff9d00; }

/* Scroll indicator */
.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  translate: -50% 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
  color: var(--text-muted);
  font-size: .75rem;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.scroll-line {
  width: 1.5px;
  height: 48px;
  background: linear-gradient(to bottom, var(--text-muted), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%, 100% { opacity: .4; transform: scaleY(1); }
  50%       { opacity: 1;  transform: scaleY(.7); }
}

/* ============================================================
   SECTIONS
   ============================================================ */
.section {
  padding-block: var(--section-gap);
}
.section-alt {
  background: var(--bg-alt);
}

.section-header {
  margin-bottom: 3.5rem;
}
.section-label {
  display: block;
  font-family: var(--font-mono);
  font-size: .8125rem;
  color: var(--accent);
  letter-spacing: .1em;
  margin-bottom: .75rem;
}
.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -.02em;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 4rem;
  align-items: start;
}
.about-text p + p { margin-top: 1rem; }
.about-text p { color: var(--text-muted); }

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: .25rem;
  transition: border-color .2s, transform .2s var(--ease);
}
.stat-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}
.stat-number {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -.03em;
  line-height: 1;
}
.stat-label {
  font-size: .8125rem;
  color: var(--text-muted);
}

/* ============================================================
   SKILLS
   ============================================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}
.skill-category {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color .2s, transform .2s var(--ease);
}
.skill-category:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}
.skill-icon {
  width: 40px; height: 40px;
  color: var(--accent);
  margin-bottom: 1rem;
}
.skill-icon svg { width: 100%; height: 100%; }
.skill-category h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: .875rem;
}

/* Tag list (shared) */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
}
.tag-list li {
  background: var(--accent-dim);
  color: var(--accent);
  padding: .2rem .6rem;
  border-radius: 4px;
  font-size: .75rem;
  font-weight: 500;
  font-family: var(--font-mono);
  letter-spacing: .03em;
}

/* ============================================================
   EXPERIENCE / TIMELINE
   ============================================================ */
.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 1.5px;
  background: var(--border);
}

.timeline-item {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 2rem;
  padding-bottom: 3rem;
}
.timeline-item:last-child { padding-bottom: 0; }

.timeline-marker {
  width: 24px; height: 24px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: var(--bg);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
  transition: background .2s;
  margin-top: 2px;
}
.timeline-item:hover .timeline-marker { background: var(--accent); }

.timeline-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color .2s;
}
.timeline-item:hover .timeline-content { border-color: var(--accent); }

.timeline-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: .5rem;
}
.timeline-date {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--accent);
  letter-spacing: .05em;
}
.timeline-company {
  font-size: .8125rem;
  color: var(--text-muted);
  font-weight: 500;
}
.timeline-role {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: .5rem;
}
.timeline-content > p {
  color: var(--text-muted);
  font-size: .9375rem;
  margin-bottom: 1rem;
}
.timeline-content .tag-list { margin-top: .75rem; }

/* ============================================================
   PROJECTS
   ============================================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}
.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: .75rem;
  transition: border-color .2s, transform .25s var(--ease), box-shadow .25s;
}
.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(99,102,241,.15);
}

.project-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}
.project-icon {
  width: 36px; height: 36px;
  color: var(--accent);
}
.project-icon svg { width: 100%; height: 100%; }

.project-links { display: flex; gap: .5rem; }

.icon-link {
  width: 32px; height: 32px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: color .2s, background .2s;
}
.icon-link:hover { color: var(--text); background: var(--surface-2); }
.icon-link svg { width: 16px; height: 16px; }

.project-card h3 {
  font-size: 1.0625rem;
  font-weight: 600;
}
.project-card > p {
  color: var(--text-muted);
  font-size: .9375rem;
  flex: 1;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact-layout {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 4rem;
  align-items: center;
}
.contact-text > p {
  color: var(--text-muted);
  font-size: 1.125rem;
  max-width: 440px;
  margin-bottom: 2rem;
}
.contact-btn svg { width: 18px; height: 18px; }

.contact-links {
  display: flex;
  flex-direction: column;
  gap: .75rem;
}
.social-link {
  display: flex;
  align-items: center;
  gap: .875rem;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-weight: 500;
  color: var(--text-muted);
  transition: color .2s, border-color .2s, transform .2s var(--ease);
}
.social-link:hover {
  color: var(--text);
  border-color: var(--accent);
  transform: translateX(4px);
}
.social-link svg { width: 20px; height: 20px; flex-shrink: 0; }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 1.75rem;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.footer-copy {
  font-size: .875rem;
  color: var(--text-muted);
}

.back-to-top {
  display: grid;
  place-items: center;
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: color .2s, border-color .2s, transform .2s var(--ease);
}
.back-to-top:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-3px);
}
.back-to-top svg { width: 16px; height: 16px; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 860px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .hero-graphic { order: -1; }
  .hero-sub { max-width: 100%; }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 640px) {
  :root { --section-gap: 4.5rem; }

  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 1rem;
    gap: .25rem;
    transform: translateY(-110%);
    opacity: 0;
    transition: transform .35s var(--ease), opacity .35s;
    pointer-events: none;
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a { display: block; padding: .6rem 1rem; }
  .nav-toggle { display: flex; }

  .about-stats { grid-template-columns: 1fr 1fr; }

  .hero-scroll { display: none; }

  .timeline::before { display: none; }
  .timeline-item { grid-template-columns: 1fr; gap: .75rem; }
  .timeline-marker { display: none; }
}