/* Menu & Navigation Styles */

/* Header & Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition-normal);
  height: 70px;
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav-logo h1 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--primary-color);
  margin: 0;
  line-height: 1.2;
}

.nav-logo span {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  display: block;
  margin-top: -2px;
  font-weight: 400;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-2);
  gap: 3px;
  z-index: 1001;
  position: relative;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--text-primary);
  transition: var(--transition-fast);
  border-radius: var(--radius-sm);
  display: block;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

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

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-6);
  margin: 0;
  padding: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-3);
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
  position: relative;
}

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

.nav-link i {
  font-size: var(--font-size-sm);
}

/* Mobile Navigation - 修正版 */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100vw;
    height: calc(100vh - 70px);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding: var(--spacing-8) var(--spacing-4);
    transition: left var(--transition-normal);
    box-shadow: var(--shadow-lg);
    z-index: 999;
    overflow-y: auto;
    margin: 0;
    list-style: none;
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .nav-menu li {
    width: 100%;
    max-width: 300px;
    margin-bottom: var(--spacing-2);
  }
  
  .nav-link {
    width: 100%;
    justify-content: center;
    padding: var(--spacing-4);
    font-size: var(--font-size-lg);
    border-radius: var(--radius-lg);
    background: rgba(37, 99, 235, 0.1);
    border: 1px solid rgba(37, 99, 235, 0.2);
    margin: 0;
  }
  
  .nav-link:hover {
    background: var(--primary-color);
    color: white;
  }
}

@media (max-width: 480px) {
  .nav-container {
    padding: 0 var(--spacing-2);
  }
  
  .nav-logo h1 {
    font-size: var(--font-size-lg);
  }
  
  .nav-logo span {
    font-size: var(--font-size-xs);
  }
  
  .nav-menu {
    padding: var(--spacing-6) var(--spacing-2);
  }
  
  .nav-link {
    padding: var(--spacing-3);
    font-size: var(--font-size-base);
  }
}