/* ── Reset ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
img, video { max-width: 100%; display: block; }
ul { list-style: none; }
a { color: inherit; text-decoration: none; }

/* ── View Transitions ──────────────────────────────── */
@keyframes fade-in  { from { opacity: 0; transform: translateY(8px); } }
@keyframes fade-out { to   { opacity: 0; transform: translateY(-8px); } }

::view-transition-old(root) {
  animation: 200ms ease-in both fade-out;
}
::view-transition-new(root) {
  animation: 250ms ease-out both fade-in;
}

/* ── Tokens ────────────────────────────────────────── */
:root {
  --bg:           #ffffff;
  --bg-secondary: #f5f5f7;
  --fg:           #1d1d1f;
  --fg-muted:     #6e6e73;
  --accent:       #0071e3;
  --accent-hover: #0077ed;
  --border:       #d2d2d7;
  --shadow:       rgba(0,0,0,0.08);
  --radius:       12px;
  --transition:   0.25s ease;
  --nav-bg:       rgba(255,255,255,0.8);
}

[data-theme="dark"] {
  --bg:           #0a0a0a;
  --bg-secondary: #1c1c1e;
  --fg:           #f5f5f7;
  --fg-muted:     #98989d;
  --accent:       #2997ff;
  --accent-hover: #409cff;
  --border:       #2c2c2e;
  --shadow:       rgba(0,0,0,0.4);
  --nav-bg:       rgba(10,10,10,0.8);
}

/* ── Base ──────────────────────────────────────────── */
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  background: var(--bg);
  color: var(--fg);
  transition: background-color var(--transition), color var(--transition);
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ── Nav ───────────────────────────────────────────── */
#nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--fg);
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--fg-muted);
  transition: color var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

#theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--fg-muted);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}

#theme-toggle:hover {
  color: var(--fg);
  background: var(--bg-secondary);
}

#hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--fg-muted);
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}

#hamburger:hover { color: var(--fg); background: var(--bg-secondary); }

/* ── Sections ──────────────────────────────────────── */
section {
  padding: 88px 0;
}

section:nth-child(even) {
  background: var(--bg-secondary);
  transition: background var(--transition);
}

section h2 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 2.5rem;
}

/* ── About ─────────────────────────────────────────── */
#about {
  padding-top: 100px;
  padding-bottom: 100px;
}

.about-eyebrow {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

#about h1 {
  font-size: clamp(2.5rem, 6vw, 3.5rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 0.5rem;
}

.role {
  font-size: 1.25rem;
  color: var(--fg-muted);
  margin-bottom: 1.5rem;
  font-weight: 400;
}

.bio {
  font-size: 1.05rem;
  color: var(--fg-muted);
  max-width: 520px;
  line-height: 1.7;
  margin-bottom: 2.5rem;
}

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

/* ── Buttons ───────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform 0.15s ease, box-shadow 0.15s ease;
  border: 1.5px solid transparent;
}

.btn:hover { transform: translateY(-1px); }

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

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 4px 14px rgba(0,113,227,0.35);
}

.btn-outline {
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Projects ──────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 1.25rem;
}

/* ── Project Reel ──────────────────────────────────── */
.reel-viewport {
  overflow: hidden;
  padding: 1rem 0 2rem;
  cursor: grab;
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 6%, black 94%, transparent 100%);
  mask-image: linear-gradient(to right, transparent 0%, black 6%, black 94%, transparent 100%);
}

.reel-viewport:active { cursor: grabbing; }

.reel-track {
  display: flex;
  gap: 1.25rem;
  width: max-content;
  animation: reel-scroll 28s linear infinite;
}

.reel-viewport:hover .reel-track { animation-play-state: paused; }

@keyframes reel-scroll {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.reel-card {
  width: 320px;
  flex-shrink: 0;
}

/* ── Card Carousel ─────────────────────────────────── */
.card-carousel {
  position: relative;
  margin: -1.5rem -1.5rem 1.25rem -1.5rem;
  background: var(--bg-secondary);
  border-radius: calc(var(--radius) - 2px) calc(var(--radius) - 2px) 0 0;
  overflow: hidden;
}

.carousel-track {
  display: flex;
  transition: transform 0.35s ease;
}

.carousel-track img {
  flex-shrink: 0;
  width: 100%;
  height: 200px;
  display: block;
  object-fit: cover;
  object-position: center top;
  cursor: zoom-in;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0,0,0,0.45);
  border: none;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  cursor: pointer;
  color: #fff;
  transition: background 0.15s ease;
  z-index: 2;
  line-height: 1;
}

.carousel-btn:hover { background: rgba(0,0,0,0.7); }
.carousel-btn.prev { left: 0.6rem; }
.carousel-btn.next { right: 0.6rem; }

.carousel-dots {
  position: absolute;
  bottom: 0.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.35rem;
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--border);
  transition: background var(--transition);
}

.dot.active { background: var(--accent); }

/* ── Lightbox ──────────────────────────────────────── */
#lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
}

#lightbox.open { display: flex; }

#lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 24px 64px rgba(0,0,0,0.6);
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color var(--transition), background var(--transition);
}

section:nth-child(even) .card {
  background: var(--bg-secondary);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px var(--shadow);
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.card h3 a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition), text-decoration-color var(--transition);
  text-decoration-color: transparent;
}

.card h3 a:hover {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: var(--accent);
}

.card-icon {
  color: var(--fg-muted);
  flex-shrink: 0;
  margin-top: 2px;
}

.card p {
  font-size: 0.9rem;
  color: var(--fg-muted);
  line-height: 1.6;
  flex: 1;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.25rem;
}

.tag {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.2rem 0.7rem;
  font-size: 0.78rem;
  color: var(--fg-muted);
  transition: background var(--transition), border-color var(--transition);
}

section:nth-child(even) .tag {
  background: var(--bg);
}

.card-links {
  display: flex;
  gap: 1.25rem;
  margin-top: 0.5rem;
}

.card-links a {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--fg-muted);
  transition: color var(--transition);
}

.card-links a:hover { color: var(--accent); }

/* ── Skills ────────────────────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}

/* ── Uses Page ─────────────────────────────────────── */
.uses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2.5rem;
}

.uses-group h3 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--fg-muted);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.uses-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.uses-list li {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.uses-name {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--fg);
}

.uses-desc {
  font-size: 0.82rem;
  color: var(--fg-muted);
}

.skill-group h3 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--fg-muted);
  margin-bottom: 1rem;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.85rem;
  font-size: 0.875rem;
  color: var(--fg);
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

section:nth-child(even) .chip { background: var(--bg-secondary); }

/* ── Resume + Contact (side by side) ───────────────── */
#resume-contact {
  padding: 5rem 0;
}

.resume-contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

@media (max-width: 640px) {
  .resume-contact-grid {
    grid-template-columns: 1fr;
  }
}

#resume,
#contact {
  text-align: center;
}

#resume p,
#contact .section-sub {
  color: var(--fg-muted);
  margin-bottom: 2rem;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.social-links a {
  color: var(--fg-muted);
  transition: color var(--transition);
  display: flex;
  align-items: center;
}

.social-links a:hover { color: var(--accent); }

/* ── Footer ────────────────────────────────────────── */
footer {
  text-align: center;
  padding: 2rem 1.5rem;
  font-size: 0.85rem;
  color: var(--fg-muted);
  border-top: 1px solid var(--border);
  transition: border-color var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

/* ── Scroll Reveal ─────────────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: none;
}

/* ── Mobile ────────────────────────────────────────── */
@media (max-width: 768px) {
  #hamburger { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 0;
  }

  .nav-links a {
    display: block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
  }

  #nav.nav-open .nav-links { display: flex; }

  section { padding: 64px 0; }
  #about { padding-top: 72px; padding-bottom: 72px; }

  .skills-grid { grid-template-columns: 1fr; gap: 2rem; }

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

@media (max-width: 480px) {
  .cta-row { flex-direction: column; align-items: flex-start; }
  .contact-links { flex-direction: column; align-items: center; }
}