:root {
  --bg: #0a0a0b;
  --bg-alt: #111113;
  --bg-card: #18181b;
  --bg-card-hover: #1f1f23;
  --text: #e4e4e7;
  --text-muted: #a1a1aa;
  --text-dim: #71717a;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.15);
  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: var(--accent-light);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: #a5b4fc; }

/* ═══════════════════════════════════
   PRELOADER
   ═══════════════════════════════════ */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 10000;
  padding: 12px 24px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  transition: top 0.2s;
}
.skip-link:focus {
  top: 16px;
  color: #fff;
}

.preloader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s, visibility 0.5s;
}
.preloader.loaded {
  opacity: 0;
  visibility: hidden;
}
.preloader__spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

img { max-width: 100%; height: auto; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.accent { color: var(--accent-light); }

/* ═══════════════════════════════════
   NAVIGATION
   ═══════════════════════════════════ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition);
}
.nav--scrolled {
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.nav__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.5px;
}
.nav__logo:hover { color: var(--text); }
.nav__menu {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}
.nav__link {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.nav__link:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}
.nav__link--cta {
  background: var(--accent);
  color: #fff !important;
  padding: 8px 20px;
}
.nav__link--cta:hover {
  background: var(--accent-light);
  color: #fff !important;
}
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: all var(--transition);
  border-radius: 2px;
}
.nav__toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav__toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav__toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

@media (max-width: 768px) {
  .nav__toggle { display: flex; }
  .nav__menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 10, 11, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    gap: 4px;
  }
  .nav__menu.active { display: flex; }
  .nav__link { padding: 12px 16px; width: 100%; }
}

/* ═══════════════════════════════════
   HERO
   ═══════════════════════════════════ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
  background: url('../images/bg.webp') no-repeat center / cover;
  filter: brightness(0.15);
}
.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, var(--accent-glow), transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(139, 92, 246, 0.08), transparent 50%);
}
.hero__content {
  position: relative;
  text-align: center;
  max-width: 800px;
  padding: 0 24px;
}
.hero__greeting {
  font-family: var(--font-mono);
  color: var(--accent-light);
  font-size: 1.1rem;
  margin-bottom: 16px;
  letter-spacing: 2px;
}
.hero__title {
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -2px;
  color: #fff;
}
.hero__roles {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
}
.hero__role {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 400;
}
.hero__divider {
  color: var(--text-dim);
  font-weight: 300;
}
.hero__cursor {
  color: var(--accent-light);
  font-weight: 300;
  animation: blink 1s step-end infinite;
  margin-left: 2px;
}
@keyframes blink {
  50% { opacity: 0; }
}
.hero__actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.hero__social {
  display: flex;
  gap: 20px;
  justify-content: center;
  align-items: center;
}
.hero__social a {
  color: var(--text-dim);
  transition: all var(--transition);
  display: flex;
  align-items: center;
}
.hero__social a:hover {
  color: var(--accent-light);
  transform: translateY(-2px);
}
.hero__scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}
.hero__scroll a { color: var(--text-dim); }

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-8px); }
  60% { transform: translateX(-50%) translateY(-4px); }
}

/* ═══════════════════════════════════
   BUTTONS
   ═══════════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  letter-spacing: 0.2px;
}
.btn--primary {
  background: var(--accent);
  color: #fff;
}
.btn--primary:hover {
  background: var(--accent-light);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.3);
}
.btn--outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-hover);
}
.btn--outline:hover {
  color: var(--text);
  border-color: var(--accent);
  background: var(--accent-glow);
  transform: translateY(-1px);
}
.btn--small {
  font-size: 0.8rem;
  padding: 8px 16px;
}
.btn--full { width: 100%; }

/* ═══════════════════════════════════
   SECTIONS
   ═══════════════════════════════════ */
.section {
  padding: 100px 0;
}
.section--dark {
  background: var(--bg-alt);
}
.section__title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  text-align: center;
  margin-bottom: 16px;
  letter-spacing: -1px;
}
.section__subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 56px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ═══════════════════════════════════
   ABOUT
   ═══════════════════════════════════ */
.about {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 64px;
  align-items: start;
  margin-top: 48px;
}
.about__image {
  position: relative;
}
.about__image img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius);
  border: 2px solid var(--border);
}
.about__image::after {
  content: '';
  position: absolute;
  inset: 8px -8px -8px 8px;
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  z-index: -1;
  opacity: 0.3;
}
.about__content {
  min-width: 0;
}
.about__text {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: 1.05rem;
  line-height: 1.8;
}
.about__text strong {
  color: var(--text);
  font-weight: 600;
}
.about__details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 32px 0;
  padding: 24px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.about__label {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  margin-bottom: 4px;
  font-weight: 600;
}
.about__value {
  font-size: 0.95rem;
  color: var(--text);
  font-weight: 500;
}
.about__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--accent-glow);
  color: var(--accent-light);
  border: 1px solid rgba(99, 102, 241, 0.2);
  text-decoration: none;
  transition: all var(--transition);
}
.badge:hover {
  background: rgba(99, 102, 241, 0.25);
  color: var(--accent-light);
}
.badge--img {
  padding: 4px 8px;
  background: transparent;
  border-color: transparent;
}
.badge--img:hover {
  background: var(--accent-glow);
}
.badge--img img {
  display: block;
}
.badge--gold {
  background: rgba(234, 179, 8, 0.1);
  color: #eab308;
  border-color: rgba(234, 179, 8, 0.25);
}
.badge--gold:hover {
  background: rgba(234, 179, 8, 0.2);
  color: #eab308;
}
.about__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .about {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .about__image {
    max-width: 200px;
    margin: 0 auto;
  }
  .about__details {
    grid-template-columns: 1fr;
  }
}

/* ═══════════════════════════════════
   STATS
   ═══════════════════════════════════ */
.stats {
  padding: 72px 0;
  background: linear-gradient(135deg, var(--accent) 0%, #7c3aed 100%);
  position: relative;
  overflow: hidden;
}
.stats::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.stats__grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 32px;
  position: relative;
}
@media (max-width: 1024px) {
  .stats__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
.stats__item {
  text-align: center;
}
.stats__number {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 800;
  color: #fff;
  line-height: 1;
  display: inline;
}
.stats__plus {
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: 700;
  color: rgba(255, 255, 255, 0.7);
}
.stats__label {
  display: block;
  margin-top: 8px;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.8);
  font-weight: 500;
}

@media (max-width: 768px) {
  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
  }
}

/* ═══════════════════════════════════
   SKILLS
   ═══════════════════════════════════ */
.skills {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}
.skills__heading {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent-light);
  margin-bottom: 20px;
  font-weight: 700;
}
.skills__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.skill-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.skill-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}
.skill-card__icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  object-fit: contain;
}
svg.skill-card__icon {
  fill: var(--accent-light);
}
.skill-card__name {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
}

@media (max-width: 1024px) {
  .skills {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 600px) {
  .skills {
    grid-template-columns: 1fr;
  }
  .skills__grid {
    grid-template-columns: 1fr;
  }
}

/* ═══════════════════════════════════
   TIMELINE
   ═══════════════════════════════════ */
.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  padding-left: 32px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--border));
}
.timeline__item {
  position: relative;
  padding-bottom: 48px;
}
.timeline__item:last-child {
  padding-bottom: 0;
}
.timeline__marker {
  position: absolute;
  left: -38px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.timeline__content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
}
.timeline__content:hover {
  border-color: var(--border-hover);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}
.timeline__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 4px;
}
.timeline__company {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}
.timeline__date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-light);
  white-space: nowrap;
}
.timeline__role {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.timeline__content p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 12px;
  line-height: 1.7;
}
.timeline__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  background: var(--accent-glow);
  color: var(--accent-light);
  border-radius: 100px;
  border: 1px solid rgba(99, 102, 241, 0.2);
  letter-spacing: 0.3px;
}

@media (max-width: 600px) {
  .timeline { padding-left: 24px; }
  .timeline__marker { left: -30px; width: 12px; height: 12px; }
  .timeline__content { padding: 20px; }
  .timeline__header { flex-direction: column; gap: 4px; }
}

/* ═══════════════════════════════════
   PROJECTS
   ═══════════════════════════════════ */
.projects__filters {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.projects__filter {
  padding: 8px 20px;
  border: 1px solid var(--border);
  border-radius: 100px;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}
.projects__filter:hover {
  border-color: var(--accent);
  color: var(--accent-light);
}
.projects__filter.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.projects__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}
.project-card.hidden {
  display: none;
}
.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), #7c3aed);
  opacity: 0;
  transition: opacity var(--transition);
}
.project-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}
.project-card:hover::before {
  opacity: 1;
}
.project-card__header {
  margin-bottom: 12px;
}
.project-card__title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}
.project-card__type {
  font-size: 0.8rem;
  color: var(--accent-light);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.project-card__desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
  flex: 1;
  margin-bottom: 16px;
}
.project-card__desc strong {
  color: var(--text);
}
.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}
.project-card__link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-light);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition);
}
.project-card__link:hover {
  gap: 8px;
}

@media (max-width: 1024px) {
  .projects__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .projects__grid { grid-template-columns: 1fr; }
}

/* ═══════════════════════════════════
   SERVICES
   ═══════════════════════════════════ */
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
  text-align: center;
}
.service-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}
.service-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  background: var(--accent-glow);
  border-radius: var(--radius);
  color: var(--accent-light);
  margin-bottom: 20px;
}
.service-card__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
}
.service-card__desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

@media (max-width: 1024px) {
  .services__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .services__grid { grid-template-columns: 1fr; }
}

/* ═══════════════════════════════════
   ARTICLES
   ═══════════════════════════════════ */
.articles__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.article-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
  text-decoration: none;
  color: inherit;
}
.article-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
  color: inherit;
}
.article-card__date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-light);
  letter-spacing: 0.5px;
}
.article-card__title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin: 8px 0 12px;
  line-height: 1.4;
}
.article-card__desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 16px;
}
.article-card__read {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-light);
  transition: gap var(--transition);
}
.article-card:hover .article-card__read {
  text-decoration: underline;
}

@media (max-width: 1024px) {
  .articles__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .articles__grid { grid-template-columns: 1fr; }
}

/* ═══════════════════════════════════
   CONTACT
   ═══════════════════════════════════ */
.contact {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 64px;
  max-width: 900px;
  margin: 0 auto;
}
.contact__item {
  display: flex;
  gap: 16px;
  margin-bottom: 32px;
  align-items: flex-start;
}
.contact__item svg {
  color: var(--accent-light);
  flex-shrink: 0;
  margin-top: 4px;
}
.contact__item h4,
.contact__label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.contact__item p {
  color: var(--text-muted);
  font-size: 0.95rem;
}
.contact__item a {
  color: var(--accent-light);
  text-decoration: none;
  transition: color var(--transition);
}
.contact__item a:hover {
  color: var(--accent);
}
.form-group {
  position: relative;
  margin-bottom: 24px;
}
.form-group input,
.form-group textarea {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  transition: all var(--transition);
  outline: none;
}
.form-group textarea {
  resize: vertical;
  min-height: 120px;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-group label {
  position: absolute;
  left: 16px;
  top: 16px;
  color: var(--text-dim);
  font-size: 0.95rem;
  pointer-events: none;
  transition: all 0.2s ease;
}
.form-group input:focus ~ label,
.form-group input:not(:placeholder-shown) ~ label,
.form-group textarea:focus ~ label,
.form-group textarea:not(:placeholder-shown) ~ label {
  top: -8px;
  left: 12px;
  font-size: 0.75rem;
  color: var(--accent-light);
  background: var(--bg-alt);
  padding: 0 6px;
  font-weight: 600;
}
.form-status {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  display: none;
}
.form-status.success {
  display: block;
  background: rgba(34, 197, 94, 0.1);
  color: #4ade80;
  border: 1px solid rgba(34, 197, 94, 0.2);
}
.form-status.error {
  display: block;
  background: rgba(239, 68, 68, 0.1);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

@media (max-width: 768px) {
  .contact {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

/* ═══════════════════════════════════
   FOOTER
   ═══════════════════════════════════ */
.footer {
  padding: 48px 0 32px;
  border-top: 1px solid var(--border);
  background: var(--bg);
}
.footer__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
}
.footer__brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 4px;
}
.footer__social {
  display: flex;
  gap: 16px;
}
.footer__social a {
  color: var(--text-dim);
  transition: all var(--transition);
  display: flex;
  align-items: center;
}
.footer__social a:hover {
  color: var(--accent-light);
  transform: translateY(-2px);
}
.footer__bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.footer__bottom p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

@media (max-width: 600px) {
  .footer__content {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }
}

/* ═══════════════════════════════════
   BACK TO TOP
   ═══════════════════════════════════ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 92px;
  width: 44px;
  height: 44px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  z-index: 100;
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4);
}
.back-to-top:hover {
  color: #fff;
  transform: translateY(-3px);
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

/* ═══════════════════════════════════
   REVEAL ANIMATIONS
   ═══════════════════════════════════ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.skills__category.reveal.active .skill-card,
.services__grid .service-card.reveal,
.projects__grid .project-card.reveal {
  transition-delay: calc(var(--i, 0) * 0.08s);
}

/* ═══════════════════════════════════
   SELECTION & SCROLLBAR
   ═══════════════════════════════════ */
::selection {
  background: var(--accent);
  color: #fff;
}
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: var(--bg-card-hover);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-dim);
}

/* ═══════════════════════════════════
   OPEN SOURCE HIGHLIGHT
   ═══════════════════════════════════ */
.oss-highlight {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.oss-highlight__main {
  display: flex;
  gap: 32px;
  padding: 40px;
  align-items: flex-start;
}
.oss-highlight__icon {
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  background: var(--accent-glow);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-light);
}
.oss-highlight__info {
  flex: 1;
  min-width: 0;
}
.oss-highlight__title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}
.oss-highlight__tagline {
  color: var(--accent-light);
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 16px;
}
.oss-highlight__desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 24px;
}
.oss-highlight__desc strong { color: var(--text); }
.oss-highlight__stats {
  display: flex;
  gap: 32px;
  margin-bottom: 24px;
}
.oss-highlight__stat {
  text-align: center;
}
.oss-highlight__stat strong {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.2;
}
.oss-highlight__stat span {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}
.oss-highlight__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.oss-highlight__features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--border);
}
.oss-feature {
  padding: 24px;
  border-right: 1px solid var(--border);
}
.oss-feature:last-child { border-right: none; }
.oss-feature h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}
.oss-feature p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

@media (max-width: 768px) {
  .oss-highlight__main {
    flex-direction: column;
    padding: 28px;
  }
  .oss-highlight__stats {
    flex-wrap: wrap;
    gap: 20px;
  }
  .oss-highlight__features {
    grid-template-columns: 1fr 1fr;
  }
  .oss-feature:nth-child(2) { border-right: none; }
  .oss-feature {
    border-bottom: 1px solid var(--border);
  }
}
@media (max-width: 480px) {
  .oss-highlight__features {
    grid-template-columns: 1fr;
  }
  .oss-feature { border-right: none; }
}

/* ═══════════════════════════════════
   TESTIMONIALS
   ═══════════════════════════════════ */
.testimonials__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
  position: relative;
}
.testimonial-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}
.testimonial-card__quote {
  color: var(--accent-light);
  margin-bottom: 16px;
}
.testimonial-card__text {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text);
  font-style: italic;
  margin-bottom: 24px;
}
.testimonial-card__author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.testimonial-card__author strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
}
.testimonial-card__author span {
  font-size: 0.8rem;
  color: var(--text-dim);
}

@media (max-width: 1024px) {
  .testimonials__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .testimonials__grid { grid-template-columns: 1fr; }
}

/* ═══════════════════════════════════
   THEME TOGGLE
   ═══════════════════════════════════ */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
  transition: all var(--transition);
}
.theme-toggle:hover {
  color: var(--accent-light);
  border-color: var(--accent);
  background: var(--accent-glow);
}
.theme-toggle__moon { display: none; }
[data-theme="light"] .theme-toggle__sun { display: none; }
[data-theme="light"] .theme-toggle__moon { display: block; }

/* ═══════════════════════════════════
   GITHUB ACTIVITY
   ═══════════════════════════════════ */
.github-activity__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.lazy-img {
  opacity: 0;
  transition: opacity 0.4s ease;
  min-height: 120px;
  background: var(--bg-alt);
}
.lazy-img.loaded {
  opacity: 1;
}
.github-activity__card {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
}
.github-activity__contributions {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  padding: 16px;
}
@media (max-width: 768px) {
  .github-activity__grid {
    grid-template-columns: 1fr;
  }
}

/* ═══════════════════════════════════
   AI & DEVELOPER TOOLS
   ═══════════════════════════════════ */
.tools__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
}
.tool-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}
.tool-card__icon {
  width: 52px;
  height: 52px;
  background: var(--accent-glow);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-light);
  margin-bottom: 20px;
}
.tool-card__title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}
.tool-card__desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}
.tool-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
@media (max-width: 768px) {
  .tools__grid {
    grid-template-columns: 1fr;
  }
}

/* ═══════════════════════════════════
   LIGHT THEME
   ═══════════════════════════════════ */
[data-theme="light"] {
  --bg: #ffffff;
  --bg-alt: #f8f9fa;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f3f5;
  --text: #1a1a2e;
  --text-muted: #495057;
  --text-dim: #868e96;
  --accent: #4f46e5;
  --accent-light: #4338ca;
  --accent-glow: rgba(79, 70, 229, 0.08);
  --border: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.15);
}
[data-theme="light"] .hero__bg {
  filter: brightness(0.3);
}
[data-theme="light"] .nav--scrolled {
  background: rgba(255, 255, 255, 0.9);
  border-bottom-color: rgba(0, 0, 0, 0.06);
}
[data-theme="light"] .hero__title,
[data-theme="light"] .hero__social a,
[data-theme="light"] .hero__scroll a {
  color: #fff;
}
[data-theme="light"] .hero__role {
  color: rgba(255, 255, 255, 0.8);
}
[data-theme="light"] .hero__divider {
  color: rgba(255, 255, 255, 0.4);
}
[data-theme="light"] .hero .btn--outline {
  border-color: rgba(255, 255, 255, 0.3);
  color: #fff;
}
[data-theme="light"] .hero .btn--outline:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.1);
}
[data-theme="light"] .stats {
  background: linear-gradient(135deg, #4f46e5 0%, #6d28d9 100%);
}
[data-theme="light"] .back-to-top {
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.3);
}
[data-theme="light"] .skill-card,
[data-theme="light"] .project-card,
[data-theme="light"] .service-card,
[data-theme="light"] .testimonial-card,
[data-theme="light"] .article-card,
[data-theme="light"] .timeline__content,
[data-theme="light"] .oss-highlight,
[data-theme="light"] .tool-card,
[data-theme="light"] .github-activity__card,
[data-theme="light"] .github-activity__contributions {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}
[data-theme="light"] .form-group input,
[data-theme="light"] .form-group textarea {
  background: var(--bg-alt);
}
[data-theme="light"] .form-group input:focus ~ label,
[data-theme="light"] .form-group input:not(:placeholder-shown) ~ label,
[data-theme="light"] .form-group textarea:focus ~ label,
[data-theme="light"] .form-group textarea:not(:placeholder-shown) ~ label {
  background: var(--bg-alt);
}
[data-theme="light"] #preloader,
[data-theme="light"] .footer {
  background: var(--bg);
}
[data-theme="light"] a { color: var(--accent); }
[data-theme="light"] a:hover { color: #3730a3; }
[data-theme="light"] .tag {
  background: rgba(79, 70, 229, 0.06);
  color: var(--accent);
  border-color: rgba(79, 70, 229, 0.15);
}
[data-theme="light"] ::-webkit-scrollbar-track {
  background: #f8f9fa;
}
[data-theme="light"] ::-webkit-scrollbar-thumb {
  background: #ced4da;
}