/* ============================================
   LAYOUT — softwareparanutriologos.com
   Header, Footer, Grid, Navigation, Sidebar
   ============================================ */

/* ══════════════════════════════════════════════
   CONTAINER & GRID
   ══════════════════════════════════════════════ */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

.container--wide {
  max-width: var(--max-width-wide);
}

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-4,
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

/* ══════════════════════════════════════════════
   HEADER & NAVIGATION
   ══════════════════════════════════════════════ */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: hsla(210, 20%, 98%, 0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--color-border-light);
  height: var(--header-height);
  transition: all var(--duration-normal) var(--ease-out);
}

[data-theme="dark"] .site-header {
  background: hsla(220, 22%, 8%, 0.85);
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo:hover {
  text-decoration: none;
}

.site-logo__icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-600));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
  font-weight: 800;
  font-family: var(--font-heading);
}

.site-logo__text {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  line-height: var(--leading-tight);
}

.site-logo__text span {
  color: var(--color-primary);
}

/* Navigation */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.main-nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: all var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.main-nav__link:hover {
  color: var(--color-primary);
  background: var(--color-primary-50);
  text-decoration: none;
}

.main-nav__link.active {
  color: var(--color-primary);
  font-weight: 600;
  background: var(--color-primary-50);
}

/* Dropdown */
.nav-dropdown {
  position: relative;
}

.nav-dropdown__menu {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 50%;
  transform: translateX(-50%);
  min-width: 220px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(-8px);
  transition: all var(--duration-normal) var(--ease-out);
  z-index: var(--z-dropdown);
}

.nav-dropdown:hover .nav-dropdown__menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown__item {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

.nav-dropdown__item:hover {
  background: var(--color-primary-50);
  color: var(--color-primary);
  text-decoration: none;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Theme Toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all var(--duration-fast) var(--ease-out);
  font-size: 18px;
}

.theme-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-50);
}

/* Mobile Menu */
.mobile-menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  color: var(--color-text-secondary);
  flex-direction: column;
  gap: 5px;
  padding: 10px;
}

.mobile-menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: all var(--duration-normal) var(--ease-out);
}

.mobile-menu-toggle.is-active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.is-active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

@media (max-width: 900px) {
  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-6);
    gap: var(--space-2);
    transform: translateX(100%);
    transition: transform var(--duration-slow) var(--ease-out);
    z-index: var(--z-overlay);
    overflow-y: auto;
  }

  .main-nav.is-open {
    transform: translateX(0);
  }

  .main-nav__link {
    padding: var(--space-4);
    font-size: var(--text-base);
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .nav-dropdown__menu {
    position: static;
    transform: none;
    box-shadow: none;
    border: none;
    opacity: 1;
    visibility: visible;
    padding-left: var(--space-4);
    background: transparent;
    min-width: unset;
  }
}

/* ══════════════════════════════════════════════
   MAIN CONTENT LAYOUT
   ══════════════════════════════════════════════ */

.main-content {
  min-height: calc(100vh - var(--header-height));
  padding-top: var(--space-8);
  padding-bottom: var(--space-16);
}

/* Content + Sidebar layout */
.content-with-sidebar {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: var(--space-10);
  align-items: start;
}

.content-area {
  min-width: 0;
}

.sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--space-6));
  max-height: calc(100vh - var(--header-height) - var(--space-12));
  overflow-y: auto;
}

@media (max-width: 1024px) {
  .content-with-sidebar {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    display: none;
  }
}

/* ══════════════════════════════════════════════
   FOOTER
   ══════════════════════════════════════════════ */

.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
  padding-top: var(--space-16);
  padding-bottom: var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

.footer-brand {
  max-width: 320px;
}

.footer-brand__description {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
  margin-top: var(--space-4);
  margin-bottom: var(--space-6);
}

.footer-column__title {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  margin-bottom: var(--space-4);
}

.footer-column__links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-column__links li {
  margin-bottom: var(--space-2);
}

.footer-column__links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

.footer-column__links a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border-light);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.footer-bottom__links {
  display: flex;
  gap: var(--space-6);
}

.footer-bottom__links a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.footer-bottom__links a:hover {
  color: var(--color-primary);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* ══════════════════════════════════════════════
   SECTION SPACING
   ══════════════════════════════════════════════ */

.section {
  padding: var(--space-16) 0;
}

.section--sm {
  padding: var(--space-10) 0;
}

.section--lg {
  padding: var(--space-24) 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-12);
}

.section-header h2 {
  border-bottom: none;
  padding-bottom: 0;
  margin-top: 0;
}

.section-header p {
  color: var(--color-text-secondary);
  font-size: var(--text-lg);
}