/* =============================================
   EMUI.ru — header.css
   Site header, navigation, theme toggle, mobile
   ============================================= */

/* ---- Site Header ---- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  transition: background 0.35s ease, box-shadow 0.35s ease, backdrop-filter 0.35s ease;
}

/* Transparent on hero, opaque when scrolled */
.site-header.is-transparent {
  background: transparent;
  box-shadow: none;
}
.site-header.is-scrolled {
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(16px) saturate(1.5);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  box-shadow: 0 1px 0 var(--color-border), var(--shadow-sm);
}
[data-theme="dark"] .site-header.is-scrolled {
  background: rgba(8,14,26,0.88);
}

/* ---- Header Inner ---- */
.header-inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 3rem);
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

/* ---- Logo ---- */
.header-logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  transition: opacity 0.2s, transform 0.2s;
}
.header-logo:hover { opacity: 0.85; transform: scale(1.03); }
.logo-svg { width: 96px; height: auto; }

/* ---- Nav Versions ---- */
.header-nav { flex: 1; display: flex; justify-content: center; }

.nav-versions {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  list-style: none;
  flex-wrap: wrap;
  justify-content: center;
}

.nav-version-link {
  font-family: 'Sora', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  padding: 0.35rem 0.65rem;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s, transform 0.18s;
  position: relative;
}
.nav-version-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 70%;
  height: 2px;
  background: var(--gradient-logo);
  border-radius: 2px;
  transition: transform 0.22s ease;
}
.nav-version-link:hover {
  color: var(--color-text-primary);
  background: var(--color-surface);
}
.nav-version-link:hover::after { transform: translateX(-50%) scaleX(1); }

.nav-version-latest {
  background: linear-gradient(135deg, rgba(244,114,182,0.1), rgba(167,139,250,0.1), rgba(96,165,250,0.1));
  color: var(--color-accent-violet);
}
.nav-version-latest::after { width: 80%; }

.nav-sep {
  width: 1px;
  height: 18px;
  background: var(--color-border-strong);
  margin-inline: 0.4rem;
  flex-shrink: 0;
}

.nav-compare-link {
  font-family: 'Sora', sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  padding: 0.35rem 0.9rem;
  border-radius: 50px;
  border: 1.5px solid var(--color-border);
  transition: all 0.2s;
  white-space: nowrap;
}
.nav-compare-link:hover {
  color: var(--color-accent-blue);
  border-color: var(--color-accent-blue);
  background: rgba(96,165,250,0.07);
}

/* ---- Header Controls ---- */
.header-controls {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* ---- Theme Toggle ---- */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 8px;
  border-radius: 50px;
  border: 1.5px solid var(--color-border);
  background: var(--color-bg);
  transition: border-color 0.2s, background 0.2s;
  cursor: pointer;
}
.theme-toggle:hover {
  border-color: var(--color-accent-violet);
  background: var(--color-surface);
}

.theme-icon { display: flex; align-items: center; }
.theme-icon svg { width: 15px; height: 15px; color: var(--color-text-secondary); transition: color 0.2s; }
.theme-toggle:hover .theme-icon svg { color: var(--color-accent-violet); }

.theme-track {
  position: relative;
  width: 28px;
  height: 16px;
  background: var(--color-border-strong);
  border-radius: 50px;
  transition: background 0.2s;
  flex-shrink: 0;
}
.theme-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #fff;
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), background 0.2s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
[data-theme="dark"] .theme-track { background: var(--color-accent-violet); }
[data-theme="dark"] .theme-thumb { transform: translateX(12px); }

/* ---- Burger Button ---- */
.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  border-radius: 8px;
  border: 1.5px solid var(--color-border);
  background: transparent;
  transition: background 0.2s, border-color 0.2s;
  cursor: pointer;
}
.burger:hover { background: var(--color-surface); border-color: var(--color-accent-blue); }
.burger span {
  width: 100%;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
  display: block;
}
.burger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.is-open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.burger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- Mobile Nav ---- */
.mobile-nav {
  position: fixed;
  top: var(--header-h);
  right: 0;
  width: min(320px, 100vw);
  height: calc(100vh - var(--header-h));
  background: var(--color-bg);
  border-left: 1px solid var(--color-border);
  padding: 1.5rem 1.25rem;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s;
  box-shadow: none;
  z-index: 999;
}
.mobile-nav.is-open {
  transform: translateX(0);
  box-shadow: var(--shadow-lg);
}

.mobile-nav ul { display: flex; flex-direction: column; gap: 0.25rem; list-style: none; }

.mobile-nav-label {
  font-family: 'Sora', sans-serif;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: 0.25rem 0.75rem;
  margin-top: 0.5rem;
}

.mobile-nav a {
  display: block;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 0.6rem 0.75rem;
  border-radius: 10px;
  transition: background 0.15s, color 0.15s, padding-left 0.15s;
}
.mobile-nav a:hover {
  background: var(--color-surface);
  color: var(--color-text-primary);
  padding-left: 1.1rem;
}
.mobile-latest {
  color: var(--color-accent-violet) !important;
  font-weight: 600 !important;
}
.mobile-compare {
  color: var(--color-accent-blue) !important;
  font-weight: 600 !important;
}
.mobile-nav-divider {
  height: 1px;
  background: var(--color-border);
  margin: 0.5rem 0;
}

/* ---- Overlay for mobile nav ---- */
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.3);
  z-index: 998;
  backdrop-filter: blur(2px);
  opacity: 0;
  transition: opacity 0.3s;
}
.mobile-overlay.is-active { display: block; opacity: 1; }

/* ---- Responsive ---- */

/*
 * Мобильная шапка < 900px
 * Схема: [тема] ............. [логотип по центру] ............. [бургер]
 *
 * Реализация:
 *   - header-inner: flex + space-between + position:relative
 *   - header-controls: display:contents → дети (тема, бургер) выходят в flex напрямую
 *   - header-logo: position:absolute, left:50%, translateX(-50%)
 *     → логотип всегда ровно по центру экрана, вне зависимости от ширины кнопок
 *   - header-nav: скрыт
 */
@media (max-width: 900px) {
  .header-nav { display: none; }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-inline: 1rem;
    gap: 0;
    position: relative;
  }

  /* Логотип строго по центру шапки */
  .header-logo {
    position: absolute;
    left: 55%;
    transform: translateX(-50%);
    z-index: 0;
    pointer-events: auto;
  }

  /* Раскрываем controls: тема и бургер становятся
     прямыми детьми .header-inner и разъезжаются к краям через space-between */
  .header-controls {
    display: contents;
  }

  .theme-toggle {
    flex-shrink: 0;
    position: relative;
    z-index: 1;
  }

  .burger {
    display: flex;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
  }
}

@media (max-width: 480px) {
  .logo-svg { width: 80px; }
}