/* Common Styles */

body {
  font-family: var(--font-sans);
  color: var(--color-text-primary);
  background-color: var(--color-bg-main);
  line-height: var(--leading-normal);
}

/* ==============================
   Container
   ============================== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ==============================
   Header
   ============================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background-color: var(--color-bg-main);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.site-header.is-scrolled {
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

@media (min-width: 768px) {
  .header-inner {
    height: 72px;
  }
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--font-bold);
  font-size: var(--text-lg);
  transition: color var(--transition-fast);
}

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

.logo-icon {
  font-family: var(--font-mono);
  color: var(--color-primary);
}

/* Navigation */
.main-nav {
  display: none;
}

@media (min-width: 768px) {
  .main-nav {
    display: block;
  }
}

.nav-list {
  display: flex;
  gap: var(--space-6);
}

.nav-item {
  position: relative;
}

.nav-link {
  display: block;
  padding: var(--space-2) 0;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  cursor: pointer;
}

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

/* Dropdown arrow */
.nav-link.has-dropdown::after {
  content: '▼';
  margin-left: var(--space-1);
  font-size: 10px;
  transition: transform var(--transition-fast);
}

.nav-item:hover .nav-link.has-dropdown::after {
  transform: rotate(180deg);
}

/* Dropdown menu */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background-color: var(--color-bg-main);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  z-index: var(--z-dropdown);
  padding: var(--space-2) 0;
  margin-top: var(--space-2);
}

.nav-item:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.dropdown-item:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 24px;
  height: 24px;
  padding: 0;
}

@media (min-width: 768px) {
  .menu-toggle {
    display: none;
  }
}

.menu-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: all var(--transition-fast);
}

.menu-toggle.is-active .menu-toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.menu-toggle.is-active .menu-toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Mobile Navigation */
@media (max-width: 767px) {
  .main-nav.is-open {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-bg-main);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
  }

  .main-nav.is-open .nav-list {
    flex-direction: column;
    gap: 0;
    padding: var(--space-4) 0;
  }

  .main-nav.is-open .nav-link {
    display: block;
    padding: var(--space-3) var(--space-4);
  }
}

/* ==============================
   Footer
   ============================== */
.site-footer {
  margin-top: var(--space-16);
  padding: var(--space-12) 0 var(--space-8);
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  text-align: center;
}

@media (min-width: 768px) {
  .footer-inner {
    gap: var(--space-8);
  }
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-logo {
  font-family: var(--font-mono);
  font-weight: var(--font-bold);
  font-size: var(--text-lg);
  color: var(--color-primary);
}

.footer-description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.footer-links {
  display: flex;
  gap: var(--space-6);
  justify-content: center;
  flex-wrap: wrap;
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-copyright {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ==============================
   Main Content
   ============================== */
.main-content {
  min-height: calc(100vh - 200px);
}

/* ==============================
   Ad Slot
   ============================== */
.ad-slot {
  margin: var(--space-8) 0;
  padding: var(--space-4);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  text-align: center;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ad-slot::before {
  content: 'Advertisement';
  display: block;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.ad-slot--approved::before {
  display: none;
}

/* ==============================
   Utility Classes
   ============================== */
.fade-in {
  animation: fadeIn var(--transition-normal);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}