/* ==========================================================================
   HEADER.CSS - Стилізація хедера
   ========================================================================== */

/* ==========================================================================
   ЗМІННІ ХЕДЕРА
   ========================================================================== */
:root {
  --header-height: 80px;
  --header-bg: rgba(17, 17, 17, 0.95);
  --header-bg-solid: #111;
  --header-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
  --nav-link-color: #fff;
  --nav-link-hover: var(--color-primary);
  --btn-primary-bg: var(--color-primary);
  --btn-primary-hover: var(--color-primary-dark);
  --btn-secondary-color: #fff;
  --btn-secondary-border: rgba(255, 255, 255, 0.2);
}

/* ==========================================================================
   ОСНОВНІ СТИЛІ ХЕДЕРА
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: var(--header-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  z-index: 1000;
  transition: all var(--transition-fast) ease;
}

/* Прозорий хедер на герої */
.site-header.transparent {
  background: transparent;
  border-bottom: none;
  backdrop-filter: none;
}

.site-header.scrolled {
  background: var(--header-bg-solid);
  backdrop-filter: blur(10px);
  box-shadow: var(--header-shadow);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 2rem;
}

/* ==========================================================================
   ЛОГОТИП
   ========================================================================== */
.logo {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 400;
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast) ease;
}

.logo:hover {
  color: var(--color-primary-light);
  transform: scale(1.05);
}

/* ==========================================================================
   НАВІГАЦІЯ - ДЕСКТОП
   ========================================================================== */
.header__nav {
  display: flex;
  align-items: center;
}

.nav__list {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 2rem;
  margin: 0;
  padding: 0;
}

.nav__link {
  position: relative;
  font-family: var(--font-primary);
  font-weight: 500;
  font-size: 1rem;
  color: var(--nav-link-color);
  text-decoration: none;
  padding: 0.5rem 0;
  transition: color var(--transition-fast) ease;
}

.nav__link:hover {
  color: var(--nav-link-hover);
}

/* Активна секція */
.nav__link.active {
  color: var(--color-primary);
}

.nav__link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  animation: activeLinkGlow 2s infinite alternate;
}

@keyframes activeLinkGlow {
  0% { box-shadow: 0 0 2px var(--color-primary); }
  100% { box-shadow: 0 0 8px var(--color-primary); }
}

/* ==========================================================================
   КНОПКИ ДІЙ
   ========================================================================== */
.header__actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-primary);
  font-weight: 600;
  text-decoration: none;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all var(--transition-fast) ease;
  white-space: nowrap;
}

.btn--primary {
  padding: 0.75rem 1.5rem;
  background: var(--btn-primary-bg);
  color: var(--color-btn-text);
  box-shadow: 0 4px 15px rgba(248, 198, 36, 0.3);
}

.btn--primary:hover {
  background: var(--btn-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(248, 198, 36, 0.4);
}

.btn--secondary {
  padding: 0.75rem 1.5rem;
  background: transparent;
  color: var(--btn-secondary-color);
  border: 2px solid var(--btn-secondary-border);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ==========================================================================
   БУРГЕР-МЕНЮ
   ========================================================================== */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 30px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
}

.bar {
  width: 100%;
  height: 3px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: all var(--transition-fast) ease;
  transform-origin: center;
}

.nav__toggle[aria-expanded="true"] .bar:nth-child(1) {
  transform: rotate(45deg) translate(7px, 7px);
}

.nav__toggle[aria-expanded="true"] .bar:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] .bar:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* ==========================================================================
   МОБІЛЬНЕ МЕНЮ
   ========================================================================== */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: var(--header-bg-solid);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast) ease;
}

.mobile-menu.active {
  opacity: 1;
  visibility: visible;
}

.mobile-menu__content {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 2rem;
  max-width: 500px;
  margin: 0 auto;
}

.mobile-menu__close {
  align-self: flex-end;
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: 2.5rem;
  cursor: pointer;
  padding: 0;
  margin-bottom: 2rem;
  transition: transform var(--transition-fast) ease;
}

.mobile-menu__close:hover {
  transform: scale(1.1);
  color: var(--color-primary-light);
}

.mobile-nav__list {
  display: flex;
  flex-direction: column;
  list-style: none;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
  flex: 1;
}

.mobile-nav__link {
  font-family: var(--font-primary);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--nav-link-color);
  text-decoration: none;
  padding: 1rem 0;
  transition: color var(--transition-fast) ease;
  text-align: center;
}

.mobile-nav__link:hover,
.mobile-nav__link.active {
  color: var(--color-primary);
}

.mobile-menu__actions {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: auto;
  padding-top: 2rem;
}

.btn--block {
  width: 100%;
  text-align: center;
  justify-content: center;
}

/* ==========================================================================
   АДАПТИВНІСТЬ
   ========================================================================== */
@media (max-width: 1024px) {
  .nav__list {
    gap: 1.5rem;
  }
  
  .header__actions {
    gap: 0.75rem;
  }
  
  .btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
  }
}

@media (max-width: 1024px) {
  :root {
    --header-height: 70px;
  }
  
  .header__nav,
  .header__actions {
    display: none;
  }
  
  .nav__toggle {
    display: flex;
  }
  
  .mobile-menu {
    display: block;
  }
  
  .logo {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  .mobile-menu__content {
    padding: 1.5rem;
  }
  
  .mobile-nav__link {
    font-size: 1.3rem;
  }
  
  .btn {
    padding: 0.8rem 1rem;
    font-size: 0.9rem;
  }
}

/* ==========================================================================
   АНІМАЦІЇ СКРОЛУ
   ========================================================================== */
.site-header.scrolling-down {
  transform: translateY(-100%);
}

.site-header.scrolling-up {
  transform: translateY(0);
}