/**
 * Copyright © 2024-2026 MCLINYUNHAI. All Rights Reserved.
 * 凌云海工作室 保留所有权利。
 */

.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  min-height: var(--nav-h);
  background: rgba(11,14,20,.82);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .2s ease, background .2s ease;
}
.navbar.scrolled {
  background: rgba(11,14,20,.96);
  box-shadow: 0 6px 20px rgba(0,0,0,.45);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
  gap: 24px;
  overflow: hidden;          /* 子元素溢出时裁切，不破坏布局 */
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 600;
  color: var(--text);
  font-size: 15px;
  text-decoration: none;
  flex-shrink: 0;
}
.brand img {
  height: 28px;
  width: auto;
}

.nav-menu {
  display: contents;          /* 让 nav / ul / cta 直接参与 nav-inner flex 排版 */
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 1px;
  list-style: none;
  padding: 0;
  margin: 0 auto;              /* 在 brand 与 cta 之间水平居中 */
}
.nav-links a {
  position: relative;
  display: inline-flex;
  align-items: center;
  height: calc(var(--nav-h) - 10px);   /* 比容器矮 10px，留出上下各 5px 呼吸 */
  padding: 0 14px;
  color: var(--text-2);
  font-size: 13px;
  font-weight: 500;
  transition: color .18s ease, background .18s ease;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 0;
  height: 2px;
  background: var(--brand);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform .18s ease;
}
.nav-links a:hover {
  color: var(--brand);
  background: rgba(255,255,255,.04);
}
.nav-links a.active {
  color: var(--brand);
}
.nav-links a.active::after {
  transform: scaleX(1);
}

.nav-cta {
  margin-left: 4px;
  flex-shrink: 0;
}
.nav-cta .btn {
  height: 34px;           /* 导航内按钮比通用 btn 更紧凑 */
  padding: 0 16px;
  font-size: 13px;
}

/* 汉堡按钮（桌面隐藏，移动端显示） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 38px;
  height: 38px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--border);
  cursor: pointer;
  flex-shrink: 0;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 20px;
  margin: 0 auto;
  background: var(--text);
  transition: transform .25s ease, opacity .25s ease;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 导航栏响应式（≤768px：汉堡 + 下拉菜单） ---------- */
@media (max-width: 768px) {
  .nav-inner { overflow: visible; }
  .nav-toggle { display: flex; }
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    padding: 8px 0 14px;
    background: rgba(11, 14, 20, .98);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 12px 24px rgba(0, 0, 0, .45);
  }
  .nav-menu.open { display: flex; }
  .nav-links {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
  }
  .nav-links a {
    height: auto;
    padding: 13px 24px;
    justify-content: flex-start;
  }
  .nav-links a::after { display: none; }
  .nav-cta {
    margin: 10px 24px 0;
  }
  .nav-cta .btn {
    width: 100%;
    justify-content: center;
  }
}