/* ========== HEADER ========== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 2100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  transition: background var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
}

.site-header.scrolled {
  background: rgba(7, 7, 8, 0.9);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  box-shadow: 0 1px 0 var(--color-border);
}

.site-header.header-hidden { transform: translateY(-100%); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  flex-shrink: 0;
  color: inherit;
}

.site-brand__logo {
  height: 40px;
  width: auto;
  max-width: min(160px, 38vw);
  display: block;
  object-fit: contain;
  object-position: left center;
  /* меньше «кричащий» контраст; чуть смягчаем прямой чёрный фон у jpg/png */
  opacity: 0.88;
  filter: brightness(0.94);
  transform: translateY(-1px);
  transition: opacity 0.2s ease, filter 0.2s ease;
  border: none;
  background: none;
  border-radius: 3px;
}

/* чистый #000 в картинке визуально подтягивается к фону шапки (#070708) */
.site-header.scrolled .site-brand__logo,
.site-header.menu-open .site-brand__logo {
  mix-blend-mode: lighten;
  opacity: 0.9;
  filter: brightness(0.96);
}

.site-brand__text {
  font-size: 0.95rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 1);
  opacity: 0.9;
  line-height: 1;
  letter-spacing: 0.01em;
  white-space: nowrap;
  transition: color 0.2s ease, opacity 0.2s ease;
}

.site-brand:hover .site-brand__logo {
  opacity: 0.97;
  filter: brightness(1);
}

.site-brand:hover .site-brand__text {
  color: rgba(255, 255, 255, 1);
  opacity: 1;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

.header-link {
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: color var(--transition-base);
  position: relative;
}

.header-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 0;
  height: 1px;
  background: var(--color-text-primary);
  transition: width var(--transition-base);
}

.header-link:hover { color: var(--color-text-primary); }
.header-link:hover::after { width: 100%; }

.btn-sm {
  min-height: 2.25rem;
  padding: 0 1.125rem;
  font-size: 0.6875rem;
}

.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.burger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-text-primary);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.burger.is-open span:first-child { transform: translateY(3.5px) rotate(45deg); }
.burger.is-open span:last-child { transform: translateY(-3.5px) rotate(-45deg); }

@media (min-width: 769px) {
  .header-nav .mobile-menu,
  .header-nav .mobile-menu__inner,
  .header-nav .mobile-menu__links {
    display: contents;
  }
}

@media (max-width: 768px) {
  .site-brand__logo {
    height: 30px;
    max-width: min(140px, 42vw);
  }

  .header-inner .btn-sm { display: none; }
  .burger {
    display: flex;
    position: relative;
    z-index: 1;
  }

  .burger span {
    background: rgba(255, 255, 255, 0.96);
    height: 2px;
  }

  .site-header.menu-open {
    background: rgba(5, 5, 8, 0.98);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    box-shadow: 0 1px 0 var(--color-border);
  }

  .site-header.menu-open .burger span {
    background: #fff;
  }

  .header-nav {
    display: block;
    width: 0;
    height: 0;
    margin: 0;
    padding: 0;
    overflow: visible;
  }

  .mobile-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100dvh - var(--header-height));
    max-height: calc(100dvh - var(--header-height));
    z-index: 2000;
    box-sizing: border-box;
    background: rgba(5, 5, 8, 0.96);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.22s ease, visibility 0.22s ease;
  }

  .header-nav.is-open .mobile-menu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .mobile-menu__inner {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    box-sizing: border-box;
    min-height: 0;
    max-height: 100%;
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 1.25rem max(1.25rem, env(safe-area-inset-right))
      calc(1rem + env(safe-area-inset-bottom)) max(1.25rem, env(safe-area-inset-left));
  }

  .mobile-menu__links {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .mobile-menu__links .header-link {
    width: 100%;
    padding: 1rem 0;
    font-size: 1.125rem;
    font-weight: 500;
    letter-spacing: 0.03em;
    text-transform: none;
    color: rgba(255, 255, 255, 0.92);
    opacity: 0;
    transform: translateY(8px);
    transition: color 0.2s ease, opacity 0.22s ease, transform 0.22s ease;
  }

  .mobile-menu__links .header-link::after {
    display: none;
  }

  .header-nav.is-open .mobile-menu__links .header-link {
    opacity: 1;
    transform: translateY(0);
  }

  .header-nav.is-open .mobile-menu__links .header-link:nth-child(1) { transition-delay: 0.04s; }
  .header-nav.is-open .mobile-menu__links .header-link:nth-child(2) { transition-delay: 0.07s; }
  .header-nav.is-open .mobile-menu__links .header-link:nth-child(3) { transition-delay: 0.1s; }
  .header-nav.is-open .mobile-menu__links .header-link:nth-child(4) { transition-delay: 0.13s; }
  .header-nav.is-open .mobile-menu__links .header-link:nth-child(5) { transition-delay: 0.16s; }

  .mobile-menu__links .header-link:hover {
    color: rgba(255, 255, 255, 1);
  }
}

/* ========== BRAND MARK ========== */

.brand-mark {
  width: clamp(52px, 9vw, 90px);
  height: auto;
  opacity: 0.7;
  filter: drop-shadow(0 0 20px rgba(255, 240, 210, 0.2)) drop-shadow(0 0 50px rgba(255, 240, 210, 0.08));
}

/* ========== SECTION TYPOGRAPHY ========== */

.section-title {
  color: var(--color-text-primary);
  font-size: var(--font-size-h2);
  line-height: 1.1;
  font-weight: 650;
  letter-spacing: -0.025em;
  max-width: 20ch;
}

.card-title {
  color: var(--color-text-primary);
  font-size: var(--font-size-h3);
  line-height: 1.3;
  font-weight: 600;
}

.card-note {
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}

.section-kicker::before {
  content: "";
  width: 20px;
  height: 1px;
  background: rgba(255, 255, 255, 0.3);
}

.section-intro {
  margin-top: var(--space-xs);
  color: var(--color-text-secondary);
  max-width: 58ch;
}

/* ========== BUTTONS ========== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.125rem;
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 0 1.75rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    transform 220ms ease,
    box-shadow 220ms ease,
    border-color 220ms ease,
    background 220ms ease,
    color 220ms ease;
  position: relative;
}

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

.btn:active {
  transform: translateY(0);
}

.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px rgba(7, 7, 8, 0.95), 0 0 0 4px rgba(255, 240, 215, 0.35);
}

.btn-primary {
  background: linear-gradient(135deg, #eee 0%, #bbb 50%, #ddd 100%);
  color: #0a0a0a;
  border-color: rgba(255, 255, 255, 0.15);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #f4f4f4 0%, #c4c4c4 50%, #e4e4e4 100%);
  border-color: rgba(255, 255, 255, 0.28);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border-strong);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.28);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

/* ========== CARDS ========== */

.card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: clamp(1.25rem, 3vw, 2rem);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.06), transparent 50%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-card-hover);
}

.card:hover::after { opacity: 1; }

/* ========== BADGES ========== */

.badge {
  display: inline-flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.4rem 0.75rem;
}

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

@media (max-width: 640px) {
  .btn { width: 100%; }
}