/* ============================================
   Dongshandao V2 - Layout Styles
   ============================================ */

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--spacing-lg);
}

.container-narrow {
  max-width: 900px;
}

/* --- Page Wrapper --- */
.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-content {
  flex: 1;
  padding-top: var(--header-height);
}

/* --- Header / Navigation --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--color-bg-white);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-shrink: 0;
}

.site-logo img {
  height: 40px;
  width: auto;
}

.site-logo-text {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}

/* Main Navigation */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  height: 100%;
}

.main-nav a {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0 var(--spacing-base);
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text);
  position: relative;
  transition: color var(--transition);
}

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

.main-nav a.active {
  color: var(--color-primary);
}

.main-nav a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--spacing-base);
  right: var(--spacing-base);
  height: 3px;
  background-color: var(--color-primary);
  border-radius: 3px 3px 0 0;
}

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

.header-actions .icon-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--color-text-light);
  border-radius: var(--radius-full);
  transition: all var(--transition);
  position: relative;
}

.header-actions .icon-btn:hover {
  background-color: var(--color-bg-gray);
  color: var(--color-primary);
}

.header-actions .icon-btn .badge {
  position: absolute;
  top: 2px;
  right: 2px;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--color-text);
  border-radius: var(--radius-md);
}

.mobile-menu-toggle:hover {
  background-color: var(--color-bg-gray);
}

.mobile-menu-toggle .hamburger {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  position: relative;
  transition: background-color var(--transition);
}

.mobile-menu-toggle .hamburger::before,
.mobile-menu-toggle .hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  transition: transform var(--transition);
}

.mobile-menu-toggle .hamburger::before { top: -7px; }
.mobile-menu-toggle .hamburger::after { top: 7px; }

.mobile-menu-toggle.active .hamburger {
  background-color: transparent;
}

.mobile-menu-toggle.active .hamburger::before {
  transform: rotate(45deg);
  top: 0;
}

.mobile-menu-toggle.active .hamburger::after {
  transform: rotate(-45deg);
  top: 0;
}

/* --- Hero Section --- */
.hero-section {
  position: relative;
  background-color: var(--color-primary);
  color: #fff;
  padding: var(--spacing-3xl) 0;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 50%, var(--color-secondary) 100%);
  opacity: 0.9;
}

.hero-section .container {
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: #fff;
  margin-bottom: var(--spacing-base);
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.85);
  max-width: 600px;
  margin-bottom: var(--spacing-xl);
}

.hero-search {
  max-width: 550px;
}

/* --- Section --- */
.section {
  padding: var(--spacing-2xl) 0;
}

.section-sm { padding: var(--spacing-xl) 0; }
.section-lg { padding: var(--spacing-3xl) 0; }

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
  gap: var(--spacing-base);
}

.section-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text);
}

.section-subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-light);
  margin-top: var(--spacing-xs);
}

.section-more {
  font-size: var(--font-size-base);
  color: var(--color-primary);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.section-more:hover {
  color: var(--color-primary-dark);
}

/* --- Grid Layouts --- */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

.grid-auto {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.grid-auto-sm {
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

/* Sidebar Layout */
.layout-sidebar {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--spacing-xl);
}

.layout-sidebar-reverse {
  grid-template-columns: 320px 1fr;
}

.layout-sidebar-content {
  min-width: 0;
}

.layout-sidebar-content .sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--spacing-lg));
}

/* Two Column */
.layout-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
}

/* Three Column */
.layout-three-col {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--spacing-lg);
}

/* --- Flex Utilities --- */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.flex-1 { flex: 1; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-base { gap: var(--spacing-base); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* --- Footer --- */
.site-footer {
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.8);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-xl);
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-md);
}

.footer-brand .site-logo {
  margin-bottom: 0;
}

.footer-brand .site-logo-text {
  color: #fff;
}

.footer-column h4 {
  color: #fff;
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: var(--spacing-base);
}

.footer-column a {
  display: block;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--spacing-xs) 0;
  transition: color var(--transition);
}

.footer-column a:hover {
  color: #fff;
}

.footer-bottom {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.7);
}

.footer-bottom a:hover {
  color: #fff;
}

/* --- Sidebar --- */
.sidebar {
  width: 100%;
}

.sidebar-card {
  background-color: var(--color-bg-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

.sidebar-card-title {
  font-size: var(--font-size-md);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-base);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-primary);
}

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

.sidebar-list li {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border-light);
  margin: 0;
}

.sidebar-list li:last-child {
  border-bottom: none;
}

.sidebar-list a {
  display: block;
  font-size: var(--font-size-base);
  color: var(--color-text-light);
  transition: color var(--transition);
}

.sidebar-list a:hover {
  color: var(--color-primary);
}

/* --- Page Header / Banner --- */
.page-banner {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  padding: var(--spacing-2xl) 0;
  color: #fff;
  text-align: center;
}

.page-banner h1 {
  color: #fff;
  margin-bottom: var(--spacing-sm);
}

.page-banner p {
  color: rgba(255, 255, 255, 0.85);
  max-width: 700px;
  margin: 0 auto;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .layout-sidebar,
  .layout-sidebar-reverse {
    grid-template-columns: 1fr;
  }

  .grid-4 { grid-template-columns: repeat(3, 1fr); }
  .grid-5 { grid-template-columns: repeat(3, 1fr); }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .container {
    padding: 0 var(--spacing-base);
  }

  .main-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-bg-white);
    flex-direction: column;
    padding: var(--spacing-lg);
    overflow-y: auto;
    z-index: 99;
  }

  .main-nav.open {
    display: flex;
  }

  .main-nav a {
    height: auto;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border-light);
  }

  .main-nav a.active::after {
    display: none;
  }

  .main-nav a.active {
    color: var(--color-primary);
    font-weight: 600;
  }

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

  .grid-2,
  .grid-3,
  .grid-4,
  .grid-5 {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-title {
    font-size: var(--font-size-2xl);
  }

  .hero-subtitle {
    font-size: var(--font-size-base);
  }

  .section {
    padding: var(--spacing-xl) 0;
  }

  .section-title {
    font-size: var(--font-size-xl);
  }

  .layout-two-col,
  .layout-three-col {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .grid-2,
  .grid-3,
  .grid-4,
  .grid-5 {
    grid-template-columns: 1fr;
  }

  .page-banner {
    padding: var(--spacing-xl) 0;
  }

  .hero-section {
    padding: var(--spacing-2xl) 0;
  }

  .scroll-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
}