/**
 * 渊渟集团官网 - 导航栏样式
 */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  height: 80px;
  /* 确保宽度始终等于视口宽度，不受页面横向滚动影响 */
  width: 100%;
  max-width: 100%;
  /* 修复移动端横向滚动条：裁剪溢出的子元素 */
  overflow: hidden;
  /* 默认透明背景，滚动时渐变 */
  background-color: rgba(250, 248, 245, 0);
  transition: background-color var(--transition-normal) var(--ease-out),
              box-shadow var(--transition-normal) var(--ease-out),
              height var(--transition-normal) var(--ease-out);
}

.navbar.is-scrolled {
  background-color: rgba(250, 248, 245, 0.98);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  height: 64px;
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  height: 100%;
}

/* ========== 品牌 ========== */
.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-ink-black);
  transition: transform var(--transition-fast) ease;
}

.navbar-brand:hover {
  transform: scale(1.02);
}

.navbar-brand-logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: var(--radius-md);
}

.navbar-brand-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-cinnabar);
  color: var(--color-rice-paper);
  font-size: var(--text-xl);
  font-weight: 700;
  border-radius: var(--radius-md);
}

.navbar-brand-text {
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: 0.1em;
}

/* ========== 导航菜单 ========== */
.navbar-nav {
  display: flex;
  align-items: center;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.navbar-link {
  position: relative;
  font-size: var(--text-base);
  color: var(--color-ink-black);
  padding: var(--space-2) 0;
  transition: color var(--transition-fast) ease;
}

.navbar-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-cinnabar);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal) var(--ease-out);
}

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

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

/* ========== 移动端菜单按钮 ========== */
.navbar-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  gap: 6px;
}

.navbar-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-ink-black);
  transition: transform var(--transition-normal) ease,
              opacity var(--transition-normal) ease;
  border-radius: 1px;
}

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

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

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

/* ========== 遮罩层 ========== */
.navbar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(26, 26, 26, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal) ease,
              visibility var(--transition-normal) ease;
  z-index: calc(var(--z-fixed) - 1);
  /* 确保宽度始终等于视口宽度，不受页面横向滚动影响 */
  width: 100%;
  max-width: 100%;
  height: 100vh;
}

.navbar-overlay.is-active {
  opacity: 1;
  visibility: visible;
}