/* ========== VARIABLES ========== */
:root {
  --bg: #0F1115;
  --surface: #171A21;
  --surface-hover: #1E2230;
  --text-primary: #E6E8EC;
  --text-secondary: #B3B8C4;
  --accent: #5B8DFF;
  --accent-hover: #7BA5FF;
  --accent-glow: rgba(91, 141, 255, 0.25);
  --gold: #FFD700;
  --gold-dim: rgba(255, 215, 0, 0.15);
  --border: rgba(255, 255, 255, 0.06);
  --radius: 16px;
  --radius-sm: 12px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --max-width: 1200px;
  --header-h: 72px;
}

/* ========== RESET ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body.no-scroll { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }

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

/* ========== HEADER ========== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(15, 17, 21, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: all 0.3s ease;
}
.header--scrolled {
  background: rgba(15, 17, 21, 0.95);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
}
.header__logo-img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
}
.header__nav {
  display: flex;
  gap: 32px;
}
.header__nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s;
  position: relative;
}
.header__nav a:hover { color: var(--text-primary); }
.header__nav a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transform: scaleX(0);
  transition: transform 0.2s;
}
.header__nav a:hover::after { transform: scaleX(1); }

/* Burger */
.header__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.header__burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s;
}
.header__burger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.header__burger.active span:nth-child(2) { opacity: 0; }
.header__burger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile nav */
.mobile-nav {
  position: fixed;
  top: var(--header-h); left: 0; right: 0; bottom: 0;
  background: rgba(15, 17, 21, 0.98);
  backdrop-filter: blur(20px);
  z-index: 99;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
.mobile-nav.open { opacity: 1; pointer-events: all; }
.mobile-nav__links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}
.mobile-nav__links a {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color 0.2s;
}
.mobile-nav__links a:hover { color: var(--accent); }

/* ========== HERO ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: calc(var(--header-h) + 40px) 0 80px;
  overflow: hidden;
}
.hero__glow {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  animation: pulse 6s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 0.4; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 0.7; transform: translate(-50%, -50%) scale(1.1); }
}
.hero__inner {
  position: relative;
  z-index: 1;
  text-align: center;
}
.hero__logo {
  width: 140px;
  height: 140px;
  margin: 0 auto 24px;
  border-radius: 32px;
  filter: drop-shadow(0 0 40px rgba(91, 141, 255, 0.3));
  animation: float 4s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.hero__title {
  font-size: 64px;
  font-weight: 800;
  letter-spacing: -1px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 50%, var(--gold) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}
.hero__slogan {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.hero__desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 40px;
  line-height: 1.7;
}
.hero__buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 600;
  font-family: var(--font);
  border: none;
  cursor: pointer;
  transition: all 0.25s ease;
}
.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 24px var(--accent-glow);
}
.btn--primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--accent-glow);
}
.btn--secondary {
  background: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn--secondary:hover {
  background: var(--surface-hover);
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.12);
}
.btn--store {
  background: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 12px 28px;
}
.btn--store:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* ========== SECTIONS COMMON ========== */
section { padding: 100px 0; }
.section-title {
  text-align: center;
  font-size: 40px;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}
.section-subtitle {
  text-align: center;
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 60px;
}

/* ========== ABOUT ========== */
.about { background: var(--bg); }
.about__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.about__card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s ease;
}
.about__card:hover {
  border-color: rgba(91, 141, 255, 0.2);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}
.about__icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: rgba(91, 141, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.about__card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}
.about__card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========== FEATURES ========== */
.features {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.features__steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}
.features__step {
  text-align: center;
  flex: 1;
  max-width: 220px;
}
.features__step-num {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #8B5CF6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 800;
  margin: 0 auto 16px;
  box-shadow: 0 4px 24px var(--accent-glow);
}
.features__step h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}
.features__step p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}
.features__step-arrow {
  flex-shrink: 0;
  opacity: 0.4;
}

/* ========== VIDEOS ========== */
.videos { background: var(--bg); }
.videos__grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}
.videos__card {
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s ease;
  cursor: pointer;
}
.videos__card:hover {
  transform: translateY(-4px);
}
.videos__card:hover .videos__placeholder {
  border-color: var(--accent);
  background: rgba(91, 141, 255, 0.08);
}
.videos__placeholder {
  aspect-ratio: 16 / 9;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}
.videos__label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
  padding: 10px 4px 0;
}

/* ========== DOWNLOAD ========== */
.download {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.download__grid {
  display: flex;
  justify-content: center;
  gap: 80px;
  flex-wrap: wrap;
}
.download__store {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}
.download__qr {
  width: 180px;
  height: 180px;
  border-radius: var(--radius);
  overflow: hidden;
}
.download__qr-placeholder {
  width: 100%;
  height: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
.download__qr-placeholder span {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-secondary);
  opacity: 0.3;
}
.download__qr-placeholder small {
  font-size: 12px;
  color: var(--text-secondary);
  opacity: 0.4;
}

/* ========== CONTACTS ========== */
.contacts { background: var(--bg); }
.contacts__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}
.contacts__card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  transition: all 0.3s ease;
}
.contacts__card:hover {
  border-color: rgba(91, 141, 255, 0.2);
  transform: translateY(-2px);
}
.contacts__card svg {
  margin: 0 auto 12px;
}
.contacts__card h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.contacts__card a, .contacts__card p {
  font-size: 13px;
  color: var(--accent);
  word-break: keep-all;
  white-space: nowrap;
}
.contacts__card a:hover {
  text-decoration: underline;
}

/* ========== LEGAL ========== */
.legal {
  background: var(--bg);
  border-top: 1px solid var(--border);
}
.legal__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}
.legal__card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all 0.3s ease;
}
.legal__card:hover {
  border-color: rgba(91, 141, 255, 0.2);
  transform: translateY(-2px);
}
.legal__card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 10px;
}
.legal__card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}
.legal__link {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  transition: color 0.2s;
}
.legal__link:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* ========== FOOTER ========== */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer__logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 16px;
}
.footer__logo-img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}
.footer__copy {
  font-size: 13px;
  color: var(--text-secondary);
}
.footer__links {
  display: flex;
  gap: 24px;
}
.footer__links a {
  font-size: 13px;
  color: var(--text-secondary);
  transition: color 0.2s;
}
.footer__links a:hover { color: var(--accent); }

/* ========== ANIMATIONS ========== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== RESPONSIVE ========== */

/* Tablet */
@media (max-width: 1024px) {
  .about__grid { grid-template-columns: repeat(2, 1fr); }
  .videos__grid { grid-template-columns: repeat(3, 1fr); }
  .features__steps { flex-wrap: wrap; gap: 24px; }
  .features__step-arrow { display: none; }
  .features__step { max-width: none; flex-basis: 40%; }
}

/* Mobile */
@media (max-width: 768px) {
  :root { --header-h: 64px; }

  .header__nav { display: none; }
  .header__burger { display: flex; }

  .hero { min-height: auto; padding: calc(var(--header-h) + 60px) 0 60px; }
  .hero__logo { width: 100px; height: 100px; border-radius: 24px; }
  .hero__title { font-size: 44px; }
  .hero__slogan { font-size: 18px; }
  .hero__desc { font-size: 15px; }
  .hero__glow { width: 400px; height: 400px; }

  section { padding: 64px 0; }
  .section-title { font-size: 28px; }
  .section-subtitle { font-size: 15px; margin-bottom: 40px; }

  .about__grid { grid-template-columns: 1fr; }
  .about__card { padding: 24px; }

  .features__step { flex-basis: 100%; }

  .videos__grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }

  .download__grid { gap: 40px; }
  .download__qr { width: 150px; height: 150px; }

  .contacts__grid { grid-template-columns: repeat(2, 1fr); }

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

  .footer__inner { flex-direction: column; text-align: center; }
  .footer__links { flex-direction: column; gap: 12px; }
}

/* Small mobile */
@media (max-width: 400px) {
  .hero__title { font-size: 36px; }
  .hero__buttons { flex-direction: column; align-items: center; }
  .btn { width: 100%; justify-content: center; }
  .videos__grid { grid-template-columns: 1fr; }
}