/* ===== НАВИГАЦИЯ ПО САЙТУ =====
   Мобайл/планшет (по умолчанию): бургер + выезжающее меню.
   ПК (≥900px): горизонтальное меню у лого, бургер скрыт. */

/* --- по умолчанию (моб/планшет) --- */
.site-nav { display: none; }

.nav-burger {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 40px;
  padding: 0 10px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--divider-dark);
  cursor: pointer;
  flex-shrink: 0;
}
.nav-burger span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text-light);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.2s ease;
}
.nav-burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.nav-burger:focus-visible { outline: 2px solid var(--accent-bright); outline-offset: 2px; }

.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 1200;
  background: rgba(8, 12, 9, 0.98);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  padding: 80px 24px 32px;
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}
.mobile-nav.open { visibility: visible; opacity: 1; }
.mobile-nav-close {
  position: absolute;
  top: 20px;
  right: 18px;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--divider-dark);
  color: var(--text-light);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s, border-color 0.2s;
}
.mobile-nav-close:hover { color: var(--accent-bright); border-color: var(--accent); }
.mobile-nav-close:focus-visible { outline: 2px solid var(--accent-bright); outline-offset: 2px; }
.mobile-nav-link {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-light);
  text-decoration: none;
  padding: 16px 8px;
  border-bottom: 1px solid var(--divider-dark);
  transition: color 0.2s;
}
.mobile-nav-link:hover { color: var(--accent-bright); }
.mobile-nav-quiz {
  margin-top: 16px;
  text-align: center;
  color: #06140a;
  background: var(--accent);
  border: none;
  border-radius: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 14px;
}
.mobile-nav-quiz:hover { color: #06140a; }

/* --- ПК (≥900px): меню у лого, бургер скрыт --- */
@media (min-width: 900px) {
  .nav-burger { display: none; }
  .mobile-nav { display: none; }

  .site-nav {
    display: flex;
    align-items: center;
    gap: 28px;
  }
  .site-nav-link {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--mute-on-dark);
    text-decoration: none;
    transition: color 0.2s;
    white-space: nowrap;
  }
  .site-nav-link:hover { color: var(--accent-bright); }
  .site-nav-quiz {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--accent-bright);
    background: rgba(95, 214, 111, 0.12);
    border: 1px solid rgba(95, 214, 111, 0.4);
    border-radius: 50px;
    padding: 9px 18px;
    text-decoration: none;
    white-space: nowrap;
    transition: background 0.2s, transform 0.2s;
  }
  .site-nav-quiz:hover { background: rgba(95, 214, 111, 0.22); transform: translateY(-1px); }
}