/* ============================================
   天羽纺织品官网 - 布局和导航栏样式
   ============================================ */

/* 1. 固定导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 90px;
  background: rgba(255, 253, 247, 0.9);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(230, 216, 191, 0.7);
  box-shadow: var(--box-shadow-light);
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  padding: 0 clamp(16px, 6vw, 72px);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.navbar.scrolled {
  background: rgba(255, 253, 247, 0.98);
  box-shadow: var(--box-shadow-md);
}

/* 2. Logo 和品牌 */
.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  text-decoration: none;
  color: var(--primary-color);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.08em;
  margin-left: calc(-1 * var(--spacing-sm)); /* nudge brand left for tighter alignment */
}

.navbar-brand::before {
  content: none;
  display: none;
}

.navbar-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.navbar-brand-cn {
  font-size: var(--font-size-xl);
  white-space: nowrap;
}

.navbar-brand-en {
  font-size: var(--font-size-xs);
  color: var(--text-light);
  letter-spacing: 0.3em;
  white-space: nowrap;
}

.navbar-divider {
  width: 2px;
  height: 36px;
  background: linear-gradient(180deg, transparent, rgba(141, 125, 103, 0.4), transparent);
}

/* 3. 导航菜单 */
.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  list-style: none;
  margin: 0;
  padding: 0;
}

.navbar-item {
  position: relative;
}

.navbar-link {
  display: block;
  padding: 14px 18px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-color);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color var(--transition-fast);
}

.navbar-link::after {
  content: '';
  position: absolute;
  left: 18px;
  bottom: 8px;
  width: 24px;
  height: 2px;
  background-color: var(--accent-color);
  opacity: 0;
  transform: scaleX(0.5);
  transform-origin: left;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.navbar-link:hover,
.navbar-link.active {
  color: var(--primary-color);
}

.navbar-link:hover::after,
.navbar-link.active::after {
  opacity: 1;
  transform: scaleX(1);
}

/* 4. 二级下拉菜单 */
.navbar-submenu {
  position: absolute;
  top: calc(100% + 12px);
  left: 0;
  list-style: none;
  margin: 0;
  padding: var(--spacing-sm) 0;
  min-width: 220px;
  background: rgba(255, 253, 247, 0.95);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(230, 216, 191, 0.8);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--box-shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-base);
  z-index: 10;
}

.navbar-item:hover > .navbar-submenu,
.navbar-item:focus-within > .navbar-submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.navbar-submenu-link {
  display: flex;
  justify-content: space-between;
  padding: 10px 18px;
  font-size: var(--font-size-sm);
  color: var(--text-color);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.navbar-submenu-link span {
  color: var(--text-light);
  font-size: 12px;
  letter-spacing: 0.2em;
}

.navbar-submenu-link:hover {
  background: rgba(212, 175, 55, 0.1);
  color: var(--primary-color);
}

/* 5. 导航栏右侧操作区 */
.navbar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.navbar-hotline {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.navbar-hotline span {
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--text-light);
}

.navbar-hotline a {
  font-size: var(--font-size-lg);
  color: var(--accent-color);
  font-weight: var(--font-weight-bold);
}

.navbar-cta {
  border: 1px solid var(--accent-color);
  border-radius: 999px;
  padding: 10px 22px;
  font-size: 14px;
  color: var(--primary-color);
  font-weight: var(--font-weight-medium);
  position: relative;
  overflow: hidden;
}

.navbar-cta::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(212, 175, 55, 0.25), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.navbar-cta:hover::after {
  opacity: 1;
}

/* 6. 汉堡菜单（移动端） */
.navbar-toggle {
  display: none;
  background: rgba(212, 175, 55, 0.15);
  border: 1px solid rgba(212, 175, 55, 0.4);
  border-radius: 999px;
  padding: 10px 14px;
  cursor: pointer;
}

.navbar-toggle span {
  display: block;
  width: 26px;
  height: 2px;
  background-color: var(--primary-color);
  margin: 6px 0;
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.navbar-toggle.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

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

.navbar-toggle.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* 7. 页面主体区域 */
main {
  margin-top: 90px;
  min-height: calc(100vh - 90px);
}

/* 8. 页脚 */
footer {
  background: radial-gradient(circle at 10% 20%, rgba(46, 134, 171, 0.15), transparent 55%),
              radial-gradient(circle at 80% 0%, rgba(212, 175, 55, 0.2), transparent 60%),
              #1c1a18;
  color: rgba(255, 253, 247, 0.88);
  padding: var(--spacing-3xl) 0;
  margin-top: var(--spacing-3xl);
  position: relative;
  overflow: hidden;
}

footer::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('data:image/svg+xml,%3Csvg width="160" height="160" viewBox="0 0 160 160" xmlns="http://www.w3.org/2000/svg"%3E%3Cpath d="M0 80h160M80 0v160" stroke="rgba(255,255,255,0.04)" stroke-width="1"/%3E%3C/svg%3E');
  opacity: 0.3;
}

.footer-content {
  position: relative;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-2xl);
}

.footer-section h4 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
  color: var(--accent-light);
}

.footer-section p {
  font-size: var(--font-size-sm);
  color: rgba(255, 253, 247, 0.75);
  line-height: var(--line-height-relaxed);
}

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

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

.footer-section a {
  color: rgba(255, 253, 247, 0.75);
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--accent-color);
}

.footer-seal {
  width: 90px;
  height: 90px;
  border: 1px solid rgba(255, 253, 247, 0.4);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-family-main);
  font-size: 36px;
  color: var(--accent-color);
  margin-bottom: var(--spacing-md);
}

.footer-divider {
  position: relative;
  max-width: 1200px;
  margin: var(--spacing-2xl) auto;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 253, 247, 0.4), transparent);
}

.footer-bottom {
  position: relative;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  font-size: var(--font-size-sm);
  color: rgba(255, 253, 247, 0.7);
}

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

.footer-links a {
  color: rgba(255, 253, 247, 0.7);
}

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

/* 9. 面包屑导航 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--text-light);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md) 0;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
}

.breadcrumb-item a {
  color: var(--primary-color);
  text-decoration: none;
}

.breadcrumb-item a:hover {
  text-decoration: underline;
}

.breadcrumb-separator {
  margin: 0 var(--spacing-sm);
  color: var(--text-lighter);
}

.breadcrumb-item.active {
  color: var(--text-color);
}

/* 10. 响应式导航栏 - 平板 */
@media (max-width: 768px) {
  .navbar {
    padding: 0 var(--spacing-md);
    height: 80px;
  }

  .navbar-toggle {
    display: block;
  }

  .navbar-menu {
    position: absolute;
    top: 80px;
    left: 0;
    right: 0;
    background: rgba(255, 253, 247, 0.98);
    flex-direction: column;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
    box-shadow: var(--box-shadow-md);
  }

  .navbar-menu.active {
    max-height: 1000px;
  }

  .navbar-item {
    border-bottom: 1px solid rgba(230, 216, 191, 0.7);
  }

  .navbar-link {
    padding: 16px var(--spacing-lg);
    text-transform: none;
  }

  .navbar-link::after {
    display: none;
  }

  .navbar-submenu {
    position: static;
    opacity: 0;
    visibility: hidden;
    max-height: 0;
    overflow: hidden;
    box-shadow: none;
    background-color: rgba(246, 240, 231, 0.6);
    transform: none;
    transition: all var(--transition-fast);
  }

  .navbar-submenu.active {
    opacity: 1;
    visibility: visible;
    max-height: 320px;
  }

  .navbar-submenu-link {
    padding-left: var(--spacing-xl);
  }

  .navbar-hotline {
    display: none;
  }

  main {
    margin-top: 80px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* 11. 响应式导航栏 - 手机 */
@media (max-width: 480px) {
  .navbar {
    height: 70px;
    padding: 0 var(--spacing-sm);
  }

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

  .navbar-brand::before {
    content: none;
    display: none;
  }

  .navbar-brand-cn {
    font-size: var(--font-size-base);
  }

  .navbar-brand-en {
    font-size: 10px;
    letter-spacing: 0.2em;
  }

  .navbar-link {
    padding: 14px var(--spacing-md);
  }

  main {
    margin-top: 70px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .footer-links {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}

/* 12. 平滑滚动效果 */
html {
  scroll-behavior: smooth;
}

/* 13. 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 50px;
  height: 50px;
  background-color: var(--primary-color);
  color: var(--bg-color);
  border: none;
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-xl);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--box-shadow-lg);
  transition: all var(--transition-fast);
  z-index: 999;
}

.back-to-top.show {
  display: flex;
}

.back-to-top:hover {
  background-color: var(--primary-light);
  transform: translateY(-5px);
}

.back-to-top:active {
  transform: translateY(0);
}