/* ============ Base ============ */
:root {
  --bg: #0a0a0a;
  --bg-alt: #111111;
  --surface: #161616;
  --line: #262626;
  --text: #f5f5f5;
  --muted: #9a9a9a;
  --accent: #ffffff;
  --radius: 14px;
  --nav-h: 72px;
  --ease: cubic-bezier(.22, 1, .36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  font-weight: 300;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: 'Space Grotesk', 'Inter', sans-serif; font-weight: 600; line-height: 1.15; }

img { display: block; max-width: 100%; }

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

/* ============ Buttons ============ */
.btn {
  display: inline-block;
  padding: 0.9rem 2rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: transform 0.3s var(--ease), background 0.3s, color 0.3s, border-color 0.3s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--accent); color: var(--bg); }
.btn-primary:hover { background: #e2e2e2; }
.btn-outline { border: 1px solid var(--line); color: var(--text); }
.btn-outline:hover { border-color: var(--accent); }
.btn-small { padding: 0.55rem 1.4rem; font-size: 0.85rem; }

/* ============ Header ============ */
#navbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
  transition: background 0.4s, border-color 0.4s;
  border-bottom: 1px solid transparent;
}
#navbar.scrolled {
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}
#navbar nav {
  max-width: 1200px;
  height: 100%;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.nav-links {
  display: flex;
  gap: 2.2rem;
  list-style: none;
}
.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  transition: color 0.3s;
}
.nav-links a:hover { color: var(--text); }
.nav-right { display: flex; align-items: center; gap: 1.4rem; }
.logo { color: var(--accent); }
.logo-img { height: 46px; width: auto; transition: opacity 0.3s; }
.logo:hover .logo-img { opacity: 0.7; }

.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.burger span {
  width: 24px; height: 2px;
  background: var(--text);
  transition: transform 0.3s var(--ease), opacity 0.3s;
}
.burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============ Hero ============ */
#hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(10,10,10,0.78), rgba(10,10,10,0.92) 70%, var(--bg)),
    url('https://images.unsplash.com/photo-1550684376-efcbd6e3f031?auto=format&fit=crop&w=1920&q=70') center/cover no-repeat;
  animation: heroZoom 18s var(--ease) forwards;
}
@keyframes heroZoom { from { transform: scale(1.08); } to { transform: scale(1); } }

.hero-content { position: relative; padding: 0 1.5rem; max-width: 900px; }
.hero-logo {
  height: 130px;
  margin: 0 auto 1.6rem;
}
.greeting {
  font-size: 0.85rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.4rem;
}
#hero h1 {
  font-size: clamp(2.8rem, 8vw, 6rem);
  letter-spacing: -0.02em;
  margin-bottom: 1.4rem;
}
.subtitle {
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  color: var(--muted);
  margin-bottom: 2.6rem;
}
.hero-buttons { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

.scroll-down {
  position: absolute;
  bottom: 2.2rem;
  left: 50%;
  transform: translateX(-50%);
}
.scroll-down span {
  display: block;
  width: 1px; height: 48px;
  background: linear-gradient(var(--muted), transparent);
  animation: scrollPulse 2s infinite;
}
@keyframes scrollPulse {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ============ Sections ============ */
.section { padding: 7.5rem 2rem; max-width: 1100px; margin: 0 auto; }
.alt-bg {
  max-width: none;
  background: var(--bg-alt);
}
.alt-bg > * { max-width: 1100px; margin-left: auto; margin-right: auto; }

.section-header { margin-bottom: 3.5rem; }
.tag {
  display: block;
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.8rem;
}
.section-header h2 { font-size: clamp(1.9rem, 4.5vw, 2.8rem); letter-spacing: -0.01em; }

/* ============ About ============ */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 4rem;
  align-items: start;
}
.lead { font-size: 1.35rem; font-weight: 400; color: var(--text); margin-bottom: 1.2rem; }
.about-text p:not(.lead) { color: var(--muted); margin-bottom: 1rem; }
.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.stat {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.2rem;
  transition: border-color 0.3s, transform 0.3s var(--ease);
}
.stat:hover { border-color: var(--accent); transform: translateY(-3px); }
.stat-number {
  display: block;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2rem;
  font-weight: 700;
}
.stat-number small { font-size: 1.1rem; color: var(--muted); }
.stat-label { font-size: 0.82rem; color: var(--muted); }

/* ============ Cards ============ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 2.2rem;
  transition: border-color 0.3s, transform 0.4s var(--ease);
}
.card:hover { border-color: var(--accent); transform: translateY(-5px); }
.card-num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.2em;
}
.card h3 { font-size: 1.25rem; margin: 0.9rem 0 0.7rem; }
.card p { color: var(--muted); font-size: 0.95rem; }

/* ============ Timeline ============ */
.timeline { position: relative; padding-left: 2.2rem; }
.timeline::before {
  content: '';
  position: absolute;
  left: 5px; top: 6px; bottom: 6px;
  width: 1px;
  background: var(--line);
}
.timeline-item { position: relative; padding-bottom: 3rem; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-dot {
  position: absolute;
  left: -2.2rem;
  top: 7px;
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.timeline-date {
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
}
.timeline-content h3 { font-size: 1.2rem; margin: 0.5rem 0; }
.timeline-content p { color: var(--muted); font-size: 0.95rem; }

/* ============ Skills ============ */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}
.skills-block h3 { font-size: 1.2rem; margin-bottom: 1.8rem; }
.skill-bar { margin-bottom: 1.5rem; }
.skill-bar-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}
.skill-bar-label span:last-child { color: var(--muted); font-size: 0.82rem; }
.bar {
  height: 3px;
  background: var(--line);
  border-radius: 2px;
  overflow: hidden;
}
.bar-fill {
  height: 100%;
  width: 0;
  background: var(--accent);
  border-radius: 2px;
  transition: width 1.4s var(--ease) 0.25s;
}
.chip-list { display: flex; flex-wrap: wrap; gap: 0.7rem; }
.chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.5rem 1.1rem;
  font-size: 0.85rem;
  color: var(--muted);
  transition: border-color 0.3s, color 0.3s;
}
.chip:hover { border-color: var(--accent); color: var(--text); }

/* ============ Contact ============ */
.contact-intro { font-size: 1.25rem; color: var(--muted); margin-bottom: 2.5rem; }
.contact-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
.contact-card {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.6rem;
  color: var(--text);
  text-decoration: none;
  font-size: 0.98rem;
  transition: border-color 0.3s, transform 0.3s var(--ease);
  overflow-wrap: anywhere;
}
.contact-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.contact-label {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ============ Footer ============ */
footer { border-top: 1px solid var(--line); padding: 3.5rem 2rem; }
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.6rem;
  text-align: center;
}
.footer-logo { height: 80px; opacity: 0.9; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 1.8rem; }
.footer-link {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.88rem;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 0.3s;
  padding: 0;
}
.footer-link:hover { color: var(--text); }
.footer-copy { font-size: 0.8rem; color: var(--muted); }

/* ============ Modals ============ */
dialog {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 2.5rem;
  max-width: 480px;
  width: calc(100% - 3rem);
}
dialog::backdrop { background: rgba(0, 0, 0, 0.7); backdrop-filter: blur(4px); }
dialog h3 { margin-bottom: 1rem; }
dialog p { color: var(--muted); font-size: 0.95rem; margin-bottom: 0.8rem; }
.modal-note { font-size: 0.8rem; }
.modal-close {
  position: absolute;
  top: 1rem; right: 1.2rem;
  background: none;
  border: none;
  color: var(--muted);
  font-size: 1.6rem;
  cursor: pointer;
  line-height: 1;
}
.modal-close:hover { color: var(--text); }

/* ============ Reveal animations ============ */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.reveal.visible { opacity: 1; transform: none; }
.delay-1 { transition-delay: 0.12s; }
.delay-2 { transition-delay: 0.24s; }
.delay-3 { transition-delay: 0.36s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-bg { animation: none; }
  html { scroll-behavior: auto; }
}

/* ============ Responsive ============ */
@media (max-width: 900px) {
  .about-grid, .skills-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .card-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .section { padding: 5rem 1.4rem; }
  .burger { display: flex; }
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: center;
    gap: 0;
    background: rgba(10, 10, 10, 0.97);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.45s var(--ease);
  }
  .nav-links.open { max-height: 320px; }
  .nav-links li { width: 100%; text-align: center; }
  .nav-links a { display: block; padding: 1rem; }
  .nav-right .btn { display: none; }
  .logo-img { height: 46px; }
  .contact-cards { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr 1fr; }
}