/* nav.css - 导航栏样式 (玻璃质感 + 自动收起) */

#site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1),
              background 0.3s ease,
              border-color 0.3s ease;
}

#site-header.scrolled {
  background: rgba(26, 26, 26, 0.65);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom-color: rgba(255, 255, 255, 0.08);
}

#site-header.nav-hidden {
  transform: translateY(-100%);
}

#main-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100px;
}

.nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-logo img {
  height: 80px;
  width: 169px;
  object-fit: contain;
}

.nav-logo-text {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 500;
  color: #fff;
  letter-spacing: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-links li a {
  color: rgba(230, 225, 218, 0.85);
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 400;
  letter-spacing: 1.5px;
  padding: 8px 0;
  position: relative;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.nav-links li a:hover,
.nav-links li a:focus {
  color: rgba(240, 236, 230, 1);
}

.nav-links li a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: width var(--transition-normal);
}

.nav-links li a:hover::after,
.nav-links li a:focus::after {
  width: 100%;
}

/* 联系我们 - 胶囊按钮质感 */
.nav-links li.nav-contact a {
  background: rgba(180, 130, 90, 0.75);
  color: rgba(255, 252, 248, 0.95);
  padding: 8px 22px;
  border-radius: 24px;
  border: 1px solid rgba(210, 170, 130, 0.4);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  letter-spacing: 1px;
  transition: background 0.3s ease, border-color 0.3s ease, transform 0.2s ease;
}

.nav-links li.nav-contact a::after {
  display: none;
}

.nav-links li.nav-contact a:hover {
  background: rgba(190, 140, 95, 0.9);
  border-color: rgba(220, 180, 140, 0.6);
  transform: translateY(-1px);
  color: #fff;
}

.hamburger-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 32px;
  height: 32px;
  padding: 4px;
}

.hamburger-line {
  display: block;
  width: 100%;
  height: 1px;
  background-color: #fff;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

/* 平板端 */
@media (max-width: 1023px) {
  #main-nav {
    height: 70px;
  }

  .nav-links {
    gap: 28px;
  }

  .nav-links li a {
    font-size: 0.75rem;
  }
}

/* 移动端 */
@media (max-width: 767px) {
  #main-nav {
    height: 60px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    width: 100%;
    flex-direction: column;
    gap: 0;
    background-color: rgba(26, 26, 26, 0.98);
    backdrop-filter: blur(10px);
    padding: 20px 0;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links li a {
    display: block;
    padding: 14px 24px;
    font-size: 0.8125rem;
    letter-spacing: 2px;
  }

  .nav-links li a::after {
    display: none;
  }

  .hamburger-btn {
    display: flex;
  }

  #site-header.menu-open .nav-links {
    display: flex;
  }

  #site-header.menu-open .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  #site-header.menu-open .hamburger-line:nth-child(2) {
    opacity: 0;
  }

  #site-header.menu-open .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}