:root {

/* --- Mobile overflow fix --- */
html, body { max-width: 100%; overflow-x: hidden; }
@media (max-width: 767px) {
  .portfolio-track { margin: 0; }
}

  color-scheme: dark;
}

body {
  background-color: #05060f;
  background-image:
    radial-gradient(circle at 10% 20%, rgba(66, 153, 255, 0.18), transparent 45%),
    radial-gradient(circle at 90% 10%, rgba(250, 204, 21, 0.12), transparent 40%),
    radial-gradient(circle at 50% 120%, rgba(99, 102, 241, 0.16), transparent 45%),
    linear-gradient(135deg, rgba(5, 8, 16, 0.92), rgba(8, 10, 24, 0.96));
  background-attachment: fixed;
  color: #fff;
  position: relative;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 160px 160px;
  mix-blend-mode: screen;
  opacity: 0.25;
  pointer-events: none;
  z-index: -1;
}

body.mobile-nav-open {
  overflow: hidden;
}

.font-Playfair {
  font-family: 'Playfair Display', serif;
}

.chip {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.05);
  padding: 0.4rem 0.75rem;
  font-size: 0.9rem;
  line-height: 1;
}

.card {
  border-radius: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.05);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: 12px;
  padding: 0.8rem 1.2rem;
  font-weight: 700;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.btn-primary {
  background: #facc15;
  color: #111;
}

.btn-primary:hover {
  background: #fde047;
}

.btn-ghost {
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: transparent;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.05);
}

.menu-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.6rem;
  border-radius: 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.menu-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

.menu-toggle span {
  display: block;
  height: 2px;
  width: 1.5rem;
  background: #fff;
  border-radius: 999px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-nav {
  position: absolute;
  inset: auto 0 0;
  top: 100%;
  padding: 0 1rem 1.5rem;
  background: rgba(5, 6, 15, 0.96);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(20px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.45);
}

.mobile-nav-inner {
  display: grid;
  gap: 0.75rem;
  padding: 1.25rem;
  border-radius: 1.25rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(10, 10, 15, 0.85);
}

.mobile-nav-link {
  display: block;
  padding: 0.6rem 0.75rem;
  border-radius: 0.75rem;
  color: rgba(255, 255, 255, 0.8);
  font-weight: 500;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.mobile-nav-link:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 2.5rem;
  width: 2.5rem;
  border-radius: 12px;
  background: rgba(250, 204, 21, 0.15);
  color: #fde68a;
}

.gradient-dot {
  position: absolute;
  border-radius: 9999px;
  filter: blur(48px);
  opacity: 0.5;
  animation: pulse 14s ease-in-out infinite;
}

.eyebrow {
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.6);
}

.grid-surface {
  background-image: radial-gradient(circle at 1px 1px, rgba(255, 255, 255, 0.08) 0, rgba(255, 255, 255, 0) 0);
  background-size: 24px 24px;
}

.glow-border {
  position: relative;
}

.glow-border::before {
  pointer-events: none;
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-sizing: border-box;
  padding: 1px;
  background: linear-gradient(120deg, rgba(250, 204, 21, 0.8), rgba(251, 191, 36, 0.2), rgba(250, 204, 21, 0.8));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.4;
}

.glow-border:hover::before {
  opacity: 0.8;
}

.timeline {
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 1.25rem;
  width: 2px;
  background: linear-gradient(to bottom, rgba(250, 204, 21, 0.8), rgba(250, 204, 21, 0));
}

.timeline-step {
  position: relative;
  padding-left: 3.5rem;
}

.timeline-step::before {
  content: attr(data-step);
  position: absolute;
  left: 0;
  top: 0;
  height: 2.5rem;
  width: 2.5rem;
  border-radius: 9999px;
  background: rgba(250, 204, 21, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: #facc15;
  border: 1px solid rgba(250, 204, 21, 0.3);
}

html[data-current-lang="RU"] [data-lang="EN"],
html[data-current-lang="EN"] [data-lang="RU"] {
  display: none;
}

details summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  cursor: pointer;
}

details summary::-webkit-details-marker {
  display: none;
}

details summary::after {
  content: "+";
  font-weight: 600;
  font-size: 1.25rem;
  color: #facc15;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

details[open] summary::after {
  content: "–";
  transform: rotate(-90deg);
}

details .answer {
  max-width: 60ch;
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal-visible {
  opacity: 1;
  transform: translateY(0);
}

.tilt-card {
  transition: transform 0.45s ease, box-shadow 0.45s ease;
}

.tilt-card:hover {
  transform: translateY(-6px) scale(1.01);
}

.photo-tile {
  overflow: hidden;
  border-radius: 1.25rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
}

.photo-tile img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s ease, opacity 0.8s ease;
}

.photo-tile:hover img {
  transform: scale(1.05);
  opacity: 0.9;
}

.tech-logo {
  height: 2.75rem;
  width: auto;
  filter: drop-shadow(0 0 12px rgba(250, 204, 21, 0.25));
}

@media (max-width: 640px) {
  .header-container {
    gap: 0.75rem;
    align-items: flex-start;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
    gap: 0.75rem;
    align-items: center;
  }

  .header-actions #langBtn {
    flex: 0 0 auto;
  }

  .hero-chips {
    gap: 0.5rem;
  }

  .hero-chips .chip {
    font-size: 0.8rem;
    padding-inline: 0.65rem;
  }

  .hero-actions {
    width: 100%;
    gap: 0.75rem;
  }

  .hero-actions .btn {
    flex: 1 1 100%;
    justify-content: center;
  }

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

  .hero-gallery {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-gallery figure:last-child {
    grid-column: span 2;
  }

  .featured-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .featured-bar > div {
    flex-wrap: wrap;
    gap: 0.75rem;
    width: 100%;
    justify-content: flex-start;
  }

  .featured-bar .tech-logo {
    height: 2.25rem;
  }

  .timeline::before {
    left: 0.9rem;
  }

  .timeline-step {
    padding-left: 3rem;
  }

  .timeline-step::before {
    height: 2.25rem;
    width: 2.25rem;
    font-size: 0.85rem;
  }
}

.animate-float-slow {
  animation: float 8s ease-in-out infinite;
}

.animate-float-delayed {
  animation: float 10s ease-in-out infinite;
  animation-delay: 1.6s;
}

.portfolio-slider {
  position: relative;
}

.portfolio-slider::before,
.portfolio-slider::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 80px;
  pointer-events: none;
  z-index: 2;
  transition: opacity 0.3s ease;
}

.portfolio-slider::before {
  left: 0;
  background: linear-gradient(90deg, rgba(5, 6, 15, 0.85), rgba(5, 6, 15, 0));
}

.portfolio-slider::after {
  right: 0;
  background: linear-gradient(270deg, rgba(5, 6, 15, 0.85), rgba(5, 6, 15, 0));
}

.portfolio-slider.is-at-start::before,
.portfolio-slider.is-at-end::after,
.portfolio-slider.is-static::before,
.portfolio-slider.is-static::after {
  opacity: 0;
}

.portfolio-slider.is-static .slider-nav {
  display: none;
}

.portfolio-track {
  --slide-gap: 1.5rem;
  --slides-per-view: 1;
  display: flex;
  gap: var(--slide-gap);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 0.5rem 0;
  margin: 0 -0.5rem;
  padding-inline: 0.5rem;
  scrollbar-width: none;
  scroll-behavior: smooth;
}

.portfolio-track::-webkit-scrollbar {
  display: none;
}

.portfolio-slide {
  flex: 0 0 calc((100% - (var(--slides-per-view) - 1) * var(--slide-gap)) / var(--slides-per-view));
  scroll-snap-align: start;
}

.slider-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 9999px;
  background: rgba(5, 6, 15, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #facc15;
  backdrop-filter: blur(12px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  transition: transform 0.3s ease, border-color 0.3s ease, color 0.3s ease, background 0.3s ease, opacity 0.3s ease;
  z-index: 3;
}

.slider-nav:hover:not(:disabled) {
  background: rgba(250, 204, 21, 0.15);
  border-color: rgba(250, 204, 21, 0.5);
  color: #fde047;
}

.slider-nav:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.slider-nav-prev {
  left: 0;
  transform: translate(-50%, -50%);
}

.slider-nav-next {
  right: 0;
  transform: translate(50%, -50%);
}

@media (min-width: 640px) {
  .portfolio-track {
    --slides-per-view: 2;
  }
}

@media (min-width: 1024px) {
  .portfolio-track {
    --slides-per-view: 3;
  }
}

@media (min-width: 1280px) {
  .portfolio-track {
    --slides-per-view: 4;
  }
}

@media (max-width: 767px) {
  .slider-nav {
    display: inline-flex;
    width: 2.5rem;
    height: 2.5rem;
    top: 50%;
    transform: translateY(-50%);
  }

  .slider-nav-prev {
    left: 0.75rem;
    transform: translateY(-50%);
  }

  .slider-nav-next {
    right: 0.75rem;
    transform: translateY(-50%);
  }

  .portfolio-track {
    margin: 0;
    padding-inline: 0;
  }
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.35;
  }
  50% {
    opacity: 0.75;
  }
}

/* --- Burger only on mobile --- */
@media (min-width: 768px) {
  #burger{ display:none !important; }
  #menuToggle{ display:none !important; }
  .burger{ display:none !important; }
  .header__burger{ display:none !important; }
  .mb-menu-toggle{ display:none !important; }
  .menu-toggle{ display:none !important; }
  .mobile-menu-toggle{ display:none !important; }
  .mobile-nav-link{ display:none !important; }
  [data-mobile-toggle]{ display:none !important; }
}


/* Services grid cards image layout */
.service-figure{margin:0 0 .75rem 0;border-radius:1rem;overflow:hidden;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08)}
.service-img{display:block;width:100%;height:auto;object-fit:cover;aspect-ratio:16/9}
@media (min-width:1024px){
  #services .grid .card .service-img{aspect-ratio:21/9}
}


/* About section background */
#about {
  background-image: url('img/speedbackground.webp');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}


/* Floating WhatsApp button styles */
#waFloat {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 1000;
  padding: 12px 16px;
  background: radial-gradient(circle at 30% 30%, #25D366, #128C7E);
  color: #0b1b12;
  border-radius: 999px;
  font-weight: 600;
  box-shadow: 0 10px 24px rgba(18, 140, 126, .45), inset 0 0 0 1px rgba(255,255,255,.18);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
#waFloat::before {
  content: "🟢";
  font-size: 1rem;
}
@media (min-width: 1024px) {
  #waFloat { bottom: 24px; right: 24px; }
}


#about{ position:relative; }
#about::before{
  content:"";
  position:absolute; inset:0;
  background-image:url('../img/speedbackground.webp') !important;
  background-size:cover; background-position:center; background-repeat:no-repeat;
  opacity:.45; pointer-events:none; z-index:0;
}
#about>*{ position:relative; z-index:1; }


/* Background for Services ("What I do") */
#services{ position: relative; }
#services::before{
  content:"";
  position:absolute; inset:0;
  background-image:url('../img/what.webp');
  background-size:cover; background-position:center; background-repeat:no-repeat;
  opacity:.35; pointer-events:none; z-index:0;
}
#services > *{ position:relative; z-index:1; }