/* ===== dev.ШИФТ — Студия сайтов и дизайна ===== */
:root {
  --bg: #0a0a0a;
  --fg: #f5f5f5;
  --muted: #737373;
  --accent: #fff;
  --ease-out-smooth: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out-smooth: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-slow: 2s;
  --duration-mid: 1.2s;
  --duration-fast: 0.7s;
  --stack-height: 100vh;
}

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

html {
  scroll-behavior: smooth;
  scroll-snap-type: y proximity;
  scroll-padding-top: 0;
}

body {
  font-family: 'Syne', sans-serif;
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Noise overlay */
.noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1000;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 2rem;
  mix-blend-mode: difference;
  color: #fff;
}

.logo {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: inherit;
  transition: opacity var(--duration-fast) var(--ease-out-smooth);
}

.logo-prefix {
  font-size: 0.7em;
  font-weight: 800;
  vertical-align: middle;
}

.logo-word {
  font-size: 1em;
  font-weight: 800;
}

.logo:hover {
  opacity: 0.7;
}

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

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: inherit;
  opacity: 0.9;
  transition: opacity var(--duration-fast) var(--ease-out-smooth);
}

.nav-link:hover {
  opacity: 1;
}

.menu-btn {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-btn span {
  width: 24px;
  height: 2px;
  background: currentColor;
  transition: transform var(--duration-mid) var(--ease-out-smooth);
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 6rem 2rem 4rem;
  position: sticky;
  top: 0;
  z-index: 0;
  background: var(--bg);
  --scroll-y: 0px;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  scroll-margin-top: 0;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(255,255,255,0.06) 0%, transparent 60%);
  pointer-events: none;
  transform: translateY(calc(var(--scroll-y-px, 0px) * 0.18));
  transition: transform 0.35s var(--ease-out-smooth);
}

.hero::before {
  content: '';
  position: absolute;
  z-index: 1;
  top: -30%;
  left: -15%;
  right: -15%;
  height: 140%;
  background: radial-gradient(ellipse 130% 80% at 50% -15%, rgba(255,255,255,0.06) 0%, transparent 55%);
  pointer-events: none;
  animation: lightBreath 14s ease-in-out infinite;
  opacity: 0.5;
  transform: translateY(calc(var(--scroll-y-px, 0px) * 0.12));
  transition: transform 0.35s var(--ease-out-smooth);
}

.hero .hero-title,
.hero .hero-tagline,
.hero .hero-cta,
.hero .scroll-hint {
  position: relative;
  z-index: 2;
}

@keyframes lightBreath {
  0%, 100% { opacity: 0.35; }
  50% { opacity: 0.65; }
}

.hero-title {
  font-size: clamp(3rem, 12vw, 10rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.04em;
  max-width: 14ch;
  margin-bottom: 1.5rem;
  overflow: hidden;
  transform: translateY(calc(var(--scroll-y) * 0.8));
  transition: transform 0.35s var(--ease-out-smooth);
}

.hero-title .line {
  display: block;
  overflow: hidden;
  padding-bottom: 0.05em;
}

.hero-title .word {
  display: inline-block;
  transform: translateY(100%);
  animation: revealUp 2.2s var(--ease-out-smooth) forwards;
}

.hero-title .line:nth-child(1) .word { animation-delay: 0.15s; }
.hero-title .line:nth-child(2) .word { animation-delay: 0.5s; }
.hero-title .line:nth-child(3) .word { animation-delay: 0.9s; }

@keyframes revealUp {
  to {
    transform: translateY(0);
  }
}

.hero-tagline {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--muted);
  max-width: 32ch;
  margin-bottom: 2.5rem;
  opacity: 0;
  transform: translateY(16px);
  animation: fadeUp 2s var(--ease-out-smooth) 1.1s forwards;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--fg);
  text-decoration: none;
  opacity: 0;
  transform: translateY(16px);
  animation: fadeUp 2s var(--ease-out-smooth) 1.4s forwards;
  transition: gap var(--duration-mid) var(--ease-out-smooth);
}

.hero-cta:hover {
  gap: 1.25rem;
}

.hero-cta .arrow {
  transition: transform var(--duration-mid) var(--ease-out-smooth);
}

.hero-cta:hover .arrow {
  transform: translateX(4px);
}

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0;
  animation: fadeUp 2s var(--ease-out-smooth) 1.8s forwards;
}

.scroll-line {
  display: block;
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--fg), transparent);
  animation: scrollPulse 2.5s var(--ease-in-out-smooth) infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); transform-origin: top; }
}

/* ===== Scroll stack: блоки накладываются при прокрутке ===== */
/* Hero z-index: 0 (выше), about-item 1–3, portfolio 4, contact 5 */
.portfolio-section,
.contact {
  position: sticky;
  top: 0;
  z-index: 4;
  background: var(--bg);
  box-shadow: 0 -1px 0 rgba(255,255,255,0.03), 0 -8px 32px rgba(0,0,0,0.25);
  transition: box-shadow 0.5s var(--ease-out-smooth);
}

.portfolio-section {
  z-index: 4;
}

.contact {
  z-index: 5;
}

/* ===== About: каждый пункт — отдельный sticky-блок ===== */
.about {
  /* контейнер, без sticky */
}

.about-item {
  position: sticky;
  top: 0;
  z-index: 1;
  min-height: var(--stack-height);
  display: flex;
  align-items: center;
  padding: 8rem 2rem;
  background: var(--bg);
  box-shadow: 0 -1px 0 rgba(255,255,255,0.03), 0 -8px 32px rgba(0,0,0,0.25);
  transition: box-shadow 0.5s var(--ease-out-smooth);
  scroll-snap-align: start;
  scroll-snap-stop: always;
  scroll-margin-top: 0;
}

.about-item--2 {
  z-index: 2;
}

.about-item--3 {
  z-index: 3;
}

.about-item-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 4rem;
  width: 100%;
}

.about-content {
  flex: 1;
  min-width: 0;
}

.about-visual {
  flex-shrink: 0;
  width: 140px;
  opacity: 0;
  transform: translateX(12px);
  transition: opacity 1.4s var(--ease-out-smooth) 0.3s, transform 1.4s var(--ease-out-smooth) 0.3s;
}

.about.in-view .about-visual {
  opacity: 1;
  transform: translateX(0);
}

.about-item--2 .about-visual { transition-delay: 0.4s, 0.4s; }
.about-item--3 .about-visual { transition-delay: 0.6s, 0.6s; }

.about-infographic {
  width: 100%;
  height: auto;
  color: var(--fg);
  transform: translateY(calc(var(--scroll-y-px, 0px) * -0.025));
  transition: transform 0.4s var(--ease-out-smooth);
}

.about-infographic--1 {
  opacity: 0.85;
}

.about-infographic--2 {
  opacity: 0.9;
}

.about-infographic--3 {
  opacity: 0.85;
}

.about-number {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 1rem;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 1.4s var(--ease-out-smooth), transform 1.4s var(--ease-out-smooth);
}

.about.in-view .about-number {
  opacity: 1;
  transform: translateY(0);
}

.about-item--2 .about-number { transition-delay: 0.2s; }
.about-item--3 .about-number { transition-delay: 0.4s; }

.about-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 1.8s var(--ease-out-smooth) 0.15s, transform 1.8s var(--ease-out-smooth) 0.15s;
}

.about.in-view .about-title {
  opacity: 1;
  transform: translateY(0);
}

.about-item--2 .about-title { transition-delay: 0.25s, 0.25s; }
.about-item--3 .about-title { transition-delay: 0.45s, 0.45s; }

.about-text {
  font-size: 1.125rem;
  color: var(--muted);
  line-height: 1.6;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 1.4s var(--ease-out-smooth) 0.25s, transform 1.4s var(--ease-out-smooth) 0.25s;
}

.about.in-view .about-text {
  opacity: 1;
  transform: translateY(0);
}

.about-item--2 .about-text { transition-delay: 0.3s, 0.3s; }
.about-item--3 .about-text { transition-delay: 0.5s, 0.5s; }

/* ===== Portfolio ===== */
.portfolio-section {
  padding: 8rem 2rem 10rem;
  min-height: var(--stack-height);
  scroll-snap-align: start;
  scroll-snap-stop: always;
  scroll-margin-top: 0;
}

.portfolio-header {
  max-width: 1200px;
  margin: 0 auto 4rem;
}

.portfolio-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 1.4s var(--ease-out-smooth), transform 1.4s var(--ease-out-smooth);
}

.portfolio-section.in-view .portfolio-label {
  opacity: 1;
  transform: translateY(0);
}

.portfolio-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 1.8s var(--ease-out-smooth) 0.2s, transform 1.8s var(--ease-out-smooth) 0.2s;
}

.portfolio-section.in-view .portfolio-title {
  opacity: 1;
  transform: translateY(0);
}

.portfolio-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.portfolio-item {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 1.6s var(--ease-out-smooth), transform 1.6s var(--ease-out-smooth);
}

.portfolio-section.in-view .portfolio-item[data-delay="0"] { transition-delay: 0.2s; }
.portfolio-section.in-view .portfolio-item[data-delay="1"] { transition-delay: 0.35s; }
.portfolio-section.in-view .portfolio-item[data-delay="2"] { transition-delay: 0.5s; }
.portfolio-section.in-view .portfolio-item[data-delay="3"] { transition-delay: 0.65s; }

.portfolio-section.in-view .portfolio-item {
  opacity: 1;
  transform: translateY(0);
}

.portfolio-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.portfolio-image {
  aspect-ratio: 16/9;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 1.25rem;
  background: rgba(255,255,255,0.03);
}

.portfolio-image--video,
.portfolio-image--img {
  position: relative;
}

.portfolio-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out-smooth);
}

.portfolio-link:hover .portfolio-img {
  transform: scale(1.02);
}

.portfolio-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform var(--duration-slow) var(--ease-out-smooth);
}

.portfolio-link:hover .portfolio-video {
  transform: scale(1.02);
}

.portfolio-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  font-weight: 800;
  color: rgba(255,255,255,0.15);
  background: linear-gradient(135deg, hsl(var(--hue), 20%, 12%) 0%, hsl(var(--hue), 15%, 8%) 100%);
  transition: transform var(--duration-slow) var(--ease-out-smooth), color var(--duration-mid) var(--ease-out-smooth);
}

.portfolio-link:hover .portfolio-placeholder {
  transform: scale(1.02);
  color: rgba(255,255,255,0.35);
}

.portfolio-info h3 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
  transition: color var(--duration-fast) var(--ease-out-smooth);
}

.portfolio-link:hover .portfolio-info h3 {
  color: var(--accent);
}

.portfolio-info span {
  font-size: 0.875rem;
  color: var(--muted);
}

/* ===== Contact ===== */
.contact {
  padding: 8rem 2rem;
  min-height: var(--stack-height);
  display: flex;
  align-items: center;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  scroll-margin-top: 0;
}

.contact-inner {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.contact-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 1.4s var(--ease-out-smooth), transform 1.4s var(--ease-out-smooth);
}

.contact.in-view .contact-label {
  opacity: 1;
  transform: translateY(0);
}

.contact-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 1.8s var(--ease-out-smooth) 0.15s, transform 1.8s var(--ease-out-smooth) 0.15s;
}

.contact.in-view .contact-title {
  opacity: 1;
  transform: translateY(0);
}

.contact-demo {
  font-size: 1rem;
  color: var(--muted);
  margin-bottom: 1rem;
  line-height: 1.5;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 1.4s var(--ease-out-smooth) 0.2s, transform 1.4s var(--ease-out-smooth) 0.2s;
}

.contact.in-view .contact-demo {
  opacity: 1;
  transform: translateY(0);
}

.contact-email {
  font-size: clamp(1.25rem, 3vw, 2rem);
  font-weight: 600;
  color: var(--fg);
  text-decoration: none;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 1.4s var(--ease-out-smooth) 0.3s, transform 1.4s var(--ease-out-smooth) 0.3s, color var(--duration-fast) var(--ease-out-smooth);
}

.contact.in-view .contact-email {
  opacity: 1;
  transform: translateY(0);
}

.contact-email:hover {
  color: var(--accent);
}

/* ===== Footer ===== */
.footer {
  padding: 2rem;
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--muted);
  min-height: 0;
}

.footer-name {
  font-family: 'Syne', sans-serif;
  font-weight: 600;
  color: var(--fg);
}

.footer-reqs {
  font-size: 0.75rem;
  line-height: 1.5;
  text-align: center;
  color: var(--muted);
}

.footer-name .logo-prefix {
  font-size: 0.7em;
}

.footer-name .logo-word {
  font-size: 1em;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav {
    display: none;
  }

  .menu-btn {
    display: flex;
  }

  .about-item-inner {
    flex-direction: column;
    gap: 2.5rem;
    align-items: flex-start;
  }

  .about-visual {
    width: 100px;
    margin-top: 0.5rem;
  }

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

  .portfolio-section.in-view .portfolio-item[data-delay="0"],
  .portfolio-section.in-view .portfolio-item[data-delay="1"],
  .portfolio-section.in-view .portfolio-item[data-delay="2"],
  .portfolio-section.in-view .portfolio-item[data-delay="3"] {
    transition-delay: 0.2s;
  }

  .footer {
    flex-direction: column;
    align-items: flex-start;
    padding: 1.75rem 1.25rem;
    gap: 1.25rem;
  }

  .footer-reqs {
    text-align: left;
    order: 1;
  }

  .footer-name {
    order: 0;
  }

  .footer-year {
    order: 2;
  }
}

/* Smooth reveal for sections */
section {
  opacity: 1;
}