/* ================= 布局样式 ================= */

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

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

/* 网格系统 */
.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);
}

/* Flexbox工具类 */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-sm {
  gap: var(--spacing-sm);
}

.gap-md {
  gap: var(--spacing-md);
}

.gap-lg {
  gap: var(--spacing-lg);
}

/* 间距工具类 */
.m-0 { margin: 0; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.ml-0 { margin-left: 0; }
.mr-0 { margin-right: 0; }

.p-0 { padding: 0; }
.pt-0 { padding-top: 0; }
.pb-0 { padding-bottom: 0; }
.pl-0 { padding-left: 0; }
.pr-0 { padding-right: 0; }

/* 页眉布局 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(10, 13, 18, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: all 0.3s ease;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.site-branding {
  flex-shrink: 0;
}

.site-logo {
  text-decoration: none;
  color: var(--primary-color);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: 1px;
  transition: all 0.3s ease;
}

.site-logo:hover {
  color: var(--accent-color);
  text-shadow: 0 0 8px rgba(255, 212, 0, 0.4);
}

.main-navigation {
  flex: 1;
  display: flex;
  justify-content: center;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.25rem;
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  transition: all 0.3s ease;
}

.menu-toggle:hover {
  background: var(--bg-glass);
}

.hamburger-line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  margin: 3px 0;
  transition: all 0.3s ease;
}

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

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

.menu-toggle.active .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

.header-actions {
  flex-shrink: 0;
}

/* 主要内容区域 */
.site-main {
  margin-top: 70px; /* 页眉高度 */
  min-height: calc(100vh - 70px);
}

.content-area {
  padding: var(--spacing-2xl) 0;
}

/* 页脚布局 */
.site-footer {
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-brand {
  grid-column: 1 / -1;
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
}

.footer-description {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

.footer-social {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
}

.social-link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.3s ease;
}

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

.footer-nav h4,
.footer-contact h4,
.footer-platforms h4 {
  color: var(--text-primary);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.footer-nav ul {
  list-style: none;
  padding: 0;
}

.footer-nav li {
  margin-bottom: var(--spacing-sm);
}

.footer-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.3s ease;
}

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

.contact-info p {
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
}

.platform-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.platform-tag {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  color: var(--primary-color);
  font-weight: 500;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--border-color);
}

.footer-copyright p {
  color: var(--text-muted);
  margin: 0;
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  transition: all 0.3s ease;
}

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

/* 响应式网格 */
@media (max-width: 768px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }
  
  .footer-links {
    justify-content: center;
  }
}