/**
 * Header & Navigation Styles
 * Myśl Konserwatywna - Portal Publicystyczny
 * 
 * Mobile-first responsive header with hamburger menu
 */

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

.site-header {
  position: relative;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  z-index: var(--z-sticky);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .site-header .container {
    padding-top: var(--space-5);
    padding-bottom: var(--space-5);
  }
}

/* Sticky header */
.site-header.is-sticky {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  box-shadow: var(--shadow-md);
  animation: slideDown 0.3s ease;
}

.site-header.is-sticky .container {
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

@media (min-width: 768px) {
  .site-header.is-sticky .container {
    padding-top: var(--space-3);
    padding-bottom: var(--space-3);
  }
}

@keyframes slideDown {
  from {
    transform: translateY(-100%);
  }
  to {
    transform: translateY(0);
  }
}

/* Spacer for sticky header */
.header-spacer {
  height: 0;
}

.site-header.is-sticky + .header-spacer {
  height: 74px; /* Adjusted for smaller sticky logo (mobile) */
}

@media (min-width: 768px) {
  .site-header.is-sticky + .header-spacer {
    height: 84px; /* Adjusted for smaller sticky logo (tablet+) */
  }
}

/* ===========================================
   LOGO
   =========================================== */

.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  max-width: 70%; /* Ensure logo doesn't overwhelm mobile header */
}

.logo img {
  height: 80px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  transition: height 0.3s ease;
}

.logo-text {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  letter-spacing: var(--letter-spacing-tight);
  transition: font-size 0.3s ease;
}

@media (min-width: 768px) {
  .logo {
    max-width: none; /* Remove constraint on larger screens */
  }
  
  .logo img {
    height: 100px;
  }
  
  .logo-text {
    font-size: var(--text-2xl);
  }
}

/* Smaller logo when sticky */
.site-header.is-sticky .logo img {
  height: 50px;
}

.site-header.is-sticky .logo-text {
  font-size: var(--text-lg);
}

@media (min-width: 768px) {
  .site-header.is-sticky .logo img {
    height: 60px;
  }
  
  .site-header.is-sticky .logo-text {
    font-size: var(--text-xl);
  }
}

/* ===========================================
   MAIN NAVIGATION
   =========================================== */

.main-nav {
  display: flex;
  align-items: center;
}

/* Navigation menu */
.nav-menu {
  display: none;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  padding: var(--space-4) 0;
  z-index: var(--z-dropdown);
}

.nav-menu.is-open {
  display: flex;
}

.nav-menu li {
  border-bottom: 1px solid var(--color-border-light);
}

.nav-menu li:last-child {
  border-bottom: none;
}

.nav-menu a {
  display: block;
  padding: var(--space-3) var(--container-padding);
  font-size: var(--text-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  transition: var(--transition-colors);
}

.nav-menu a:hover,
.nav-menu a:focus {
  color: var(--color-primary);
  background-color: var(--color-bg-alt);
}

.nav-menu a.is-active {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

/* CTA button in nav */
.nav-menu .nav-cta {
  margin: var(--space-4) var(--container-padding) var(--space-2);
  padding: var(--space-3) var(--space-6);
  background-color: var(--color-secondary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-md);
  text-align: center;
  font-weight: var(--font-weight-semibold);
  transition: var(--transition-colors);
}

.nav-menu .nav-cta:hover,
.nav-menu .nav-cta:focus {
  background-color: var(--color-secondary-dark);
  color: var(--color-text-inverse);
}

/* Desktop navigation */
@media (min-width: 1024px) {
  .nav-menu {
    display: flex;
    flex-direction: row;
    position: static;
    background: none;
    border: none;
    box-shadow: none;
    padding: 0;
    gap: var(--space-1);
  }
  
  .nav-menu li {
    border: none;
  }
  
  .nav-menu a {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-sm);
    border-radius: var(--radius-md);
  }
  
  .nav-menu a:hover,
  .nav-menu a:focus {
    background-color: var(--color-bg-alt);
  }
  
  .nav-menu a.is-active {
    background-color: var(--color-bg-alt);
  }
  
  .nav-menu .nav-cta {
    margin: 0;
    margin-left: var(--space-2);
    padding: var(--space-2) var(--space-4);
  }
}

@media (min-width: 1280px) {
  .nav-menu {
    gap: var(--space-2);
  }
  
  .nav-menu a {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-base);
  }
}

/* ===========================================
   HAMBURGER MENU TOGGLE
   =========================================== */

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: var(--space-2);
  background: none;
  border: none;
  cursor: pointer;
  z-index: var(--z-dropdown);
}

.nav-toggle-icon {
  position: relative;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: var(--transition-base);
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: var(--transition-base);
}

.nav-toggle-icon::before {
  top: -7px;
}

.nav-toggle-icon::after {
  bottom: -7px;
}

/* Hamburger to X animation */
.nav-toggle.is-active .nav-toggle-icon {
  background-color: transparent;
}

.nav-toggle.is-active .nav-toggle-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle.is-active .nav-toggle-icon::after {
  bottom: 0;
  transform: rotate(-45deg);
}

/* Hide hamburger on desktop */
@media (min-width: 1024px) {
  .nav-toggle {
    display: none;
  }
}

/* ===========================================
   DROPDOWN MENU (for future use)
   =========================================== */

.nav-item-dropdown {
  position: relative;
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2) 0;
  z-index: var(--z-dropdown);
}

.nav-item-dropdown:hover .dropdown-menu,
.nav-item-dropdown:focus-within .dropdown-menu {
  display: block;
}

.dropdown-menu a {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text);
}

.dropdown-menu a:hover {
  background-color: var(--color-bg-alt);
  color: var(--color-primary);
}

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

/* Transparent header (for hero sections) */
.site-header.header-transparent {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  background-color: transparent;
  border-bottom: none;
}

.site-header.header-transparent .logo-text,
.site-header.header-transparent .nav-menu a {
  color: var(--color-text-inverse);
}

.site-header.header-transparent .nav-toggle-icon,
.site-header.header-transparent .nav-toggle-icon::before,
.site-header.header-transparent .nav-toggle-icon::after {
  background-color: var(--color-text-inverse);
}

/* Dark header */
.site-header.header-dark {
  background-color: var(--color-primary);
  border-bottom-color: var(--color-primary-dark);
}

.site-header.header-dark .logo-text,
.site-header.header-dark .nav-menu a {
  color: var(--color-text-inverse);
}

.site-header.header-dark .nav-toggle-icon,
.site-header.header-dark .nav-toggle-icon::before,
.site-header.header-dark .nav-toggle-icon::after {
  background-color: var(--color-text-inverse);
}

/* ===========================================
   MOBILE MENU OVERLAY
   =========================================== */

.nav-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: calc(var(--z-dropdown) - 1);
}

.nav-overlay.is-visible {
  display: block;
}

@media (min-width: 1024px) {
  .nav-overlay {
    display: none !important;
  }
}

/* ===========================================
   SEARCH
   =========================================== */

.header-search {
  position: relative;
  display: flex;
  align-items: center;
}

/* Search toggle button */
.search-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: var(--space-2);
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  transition: var(--transition-colors);
  border-radius: var(--radius-md);
}

.search-toggle:hover,
.search-toggle:focus {
  color: var(--color-primary);
  background-color: var(--color-bg-alt);
}

.search-toggle svg {
  width: 20px;
  height: 20px;
}

/* Fullscreen Search Overlay */
.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(26, 54, 93, 0.98);
  z-index: var(--z-modal);
  display: none;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.search-overlay.is-open {
  display: flex;
  opacity: 1;
}

.search-overlay-content {
  width: 100%;
  max-width: 800px;
  padding: var(--space-6);
  text-align: center;
}

.search-overlay-title {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-inverse);
  margin-bottom: var(--space-6);
  opacity: 0;
  transform: translateY(-20px);
  transition: opacity 0.4s ease 0.1s, transform 0.4s ease 0.1s;
}

.search-overlay.is-open .search-overlay-title {
  opacity: 1;
  transform: translateY(0);
}

/* Search form in overlay */
.search-form {
  position: relative;
  width: 100%;
  opacity: 0;
  transform: translateY(-20px);
  transition: opacity 0.4s ease 0.2s, transform 0.4s ease 0.2s;
}

.search-overlay.is-open .search-form {
  opacity: 1;
  transform: translateY(0);
}

.search-form-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

/* Search input */
.search-input {
  flex: 1;
  padding: var(--space-5) var(--space-6);
  font-size: var(--text-xl);
  color: var(--color-text);
  background-color: transparent;
  border: none;
  outline: none;
}

.search-input::placeholder {
  color: var(--color-text-muted);
}

/* Search submit button */
.search-submit {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  padding: var(--space-4);
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border: none;
  cursor: pointer;
  transition: var(--transition-colors);
  flex-shrink: 0;
}

.search-submit:hover,
.search-submit:focus {
  background-color: var(--color-primary-dark);
}

.search-submit svg {
  width: 24px;
  height: 24px;
}

/* Search close button */
.search-close {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  padding: var(--space-3);
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--color-text-inverse);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition-colors);
  opacity: 0;
  transform: scale(0.8);
  transition: opacity 0.4s ease 0.3s, transform 0.4s ease 0.3s, background-color 0.2s ease;
}

.search-overlay.is-open .search-close {
  opacity: 1;
  transform: scale(1);
}

.search-close:hover,
.search-close:focus {
  background-color: rgba(255, 255, 255, 0.2);
}

.search-close svg {
  width: 24px;
  height: 24px;
}

/* Search hint text */
.search-hint {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.7);
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 0.4s ease 0.3s, transform 0.4s ease 0.3s;
}

.search-overlay.is-open .search-hint {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive adjustments */
@media (max-width: 767px) {
  .search-overlay-content {
    padding: var(--space-4);
  }
  
  .search-overlay-title {
    font-size: var(--text-xl);
    margin-bottom: var(--space-4);
  }
  
  .search-input {
    padding: var(--space-4) var(--space-4);
    font-size: var(--text-lg);
  }
  
  .search-submit {
    width: 50px;
    height: 50px;
  }
  
  .search-submit svg {
    width: 20px;
    height: 20px;
  }
  
  .search-close {
    top: var(--space-4);
    right: var(--space-4);
    width: 40px;
    height: 40px;
  }
  
  .search-close svg {
    width: 20px;
    height: 20px;
  }
}

@media (min-width: 768px) {
  .search-overlay-title {
    font-size: var(--text-3xl);
  }
  
  .search-input {
    font-size: var(--text-2xl);
  }
}