/**
 * NischenKit Layout Styles
 *
 * Styles for:
 * - Container (1200px max-width centered)
 * - Skip-to-content link
 * - Header with responsive navigation
 * - CSS-only hamburger menu
 * - Footer with responsive layout
 */

/* ==========================================================================
   CONTAINER
   1200px max-width centered content wrapper
   ========================================================================== */

.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
  }
}

/* ==========================================================================
   SKIP-TO-CONTENT LINK
   Accessible skip link for keyboard navigation
   ========================================================================== */

.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  z-index: 1000;
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-primary-600);
  color: #ffffff;
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  border-radius: 0 0 var(--radius-md) 0;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--color-primary-300);
  outline-offset: 2px;
}

/* ==========================================================================
   HEADER
   Site header with logo and navigation
   ========================================================================== */

.site-header {
  background-color: var(--color-surface-base);
  border-bottom: 1px solid var(--color-neutral-200);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding: var(--space-md);
  min-height: 64px;
}

@media (min-width: 768px) {
  .header-container {
    padding: var(--space-md) var(--space-lg);
  }
}

/* Site logo/name */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-neutral-900);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-logo:hover {
  color: var(--color-primary-600);
}

.site-logo:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.site-logo__image {
  /* Match text line-height for consistent sizing */
  height: 1.5em;
  width: auto;
  display: block;
}

.site-logo__text {
  line-height: 1;
}

/* ==========================================================================
   HAMBURGER MENU (CSS-only checkbox hack)
   ========================================================================== */

/* Hide the checkbox visually */
.nav-toggle {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

/* Hamburger button */
.nav-toggle-label {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  cursor: pointer;
  padding: var(--space-sm);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.nav-toggle-label:hover {
  background-color: var(--color-neutral-100);
}

.nav-toggle-label:focus-within {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* Hamburger lines */
.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-neutral-700);
  border-radius: var(--radius-full);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.hamburger-line:nth-child(1) {
  transform: translateY(-6px);
}

.hamburger-line:nth-child(3) {
  transform: translateY(6px);
}

/* Hamburger animation when checked */
.nav-toggle:checked + .nav-toggle-label .hamburger-line:nth-child(1) {
  transform: translateY(0) rotate(45deg);
}

.nav-toggle:checked + .nav-toggle-label .hamburger-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle:checked + .nav-toggle-label .hamburger-line:nth-child(3) {
  transform: translateY(0) rotate(-45deg);
}

/* Hide hamburger on desktop */
@media (min-width: 768px) {
  .nav-toggle-label {
    display: none;
  }
}

/* Focus visible for keyboard accessibility */
.nav-toggle:focus-visible + .nav-toggle-label {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

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

.main-nav {
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  background-color: var(--color-surface-base);
  border-bottom: 1px solid var(--color-neutral-200);
  box-shadow: var(--shadow-md);
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

/* Show nav when checkbox is checked */
.nav-toggle:checked ~ .main-nav {
  max-height: 400px;
}

/* Nav list */
.nav-list {
  display: flex;
  flex-direction: column;
  padding: var(--space-sm) 0;
}

.nav-item {
  margin: 0;
}

.nav-link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--color-neutral-700);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  min-height: 44px;
  display: flex;
  align-items: center;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary-600);
  background-color: var(--color-neutral-50);
}

.nav-link:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: -2px;
  background-color: var(--color-neutral-50);
}

/* Desktop navigation styles */
@media (min-width: 768px) {
  .main-nav {
    position: static;
    max-height: none;
    overflow: visible;
    border-bottom: none;
    box-shadow: none;
    background-color: transparent;
  }

  .nav-list {
    flex-direction: row;
    padding: 0;
    gap: var(--space-xs);
  }

  .nav-link {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
  }

  .nav-link:hover {
    background-color: var(--color-neutral-100);
  }
}

/* ==========================================================================
   MAIN CONTENT
   ========================================================================== */

.main-content {
  min-height: calc(100vh - 64px - 200px); /* viewport - header - approx footer */
  padding-top: var(--space-xl);
  padding-bottom: var(--space-xl);
}

@media (min-width: 768px) {
  .main-content {
    padding-top: var(--space-2xl);
    padding-bottom: var(--space-2xl);
  }
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.site-footer {
  background-color: var(--color-neutral-50);
  border-top: 1px solid var(--color-neutral-200);
  padding: var(--space-xl) 0;
}

.footer-container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

@media (min-width: 768px) {
  .footer-container {
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-lg);
  }
}

/* Footer navigation */
.footer-nav,
.footer-legal {
  margin-bottom: var(--space-lg);
}

@media (min-width: 768px) {
  .footer-nav,
  .footer-legal {
    margin-bottom: 0;
  }
}

.footer-nav-list,
.footer-legal-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-md);
}

.footer-nav-item,
.footer-legal-item {
  margin: 0;
}

.footer-link {
  color: var(--color-neutral-600);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
  padding: var(--space-xs) 0;
  display: inline-block;
}

.footer-link:hover {
  color: var(--color-primary-600);
}

.footer-link:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Footer copyright */
.footer-copyright {
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-neutral-200);
}

@media (min-width: 768px) {
  .footer-copyright {
    width: 100%;
    text-align: center;
    padding-top: var(--space-lg);
  }
}

.footer-copyright p {
  color: var(--color-neutral-500);
  font-size: var(--font-size-sm);
  margin: 0;
}