/* ===== 导航栏 ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: background var(--transition), padding var(--transition), box-shadow var(--transition);
}
.nav.scrolled {
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 10px 0;
  box-shadow: 0 1px 0 var(--color-border-dim);
}

.nav__inner {
  display: flex;
  align-items: center;
  gap: 32px;
}

/* Logo */
.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.nav__logo-text { display: flex; flex-direction: column; line-height: 1; }
.nav__logo-name { font-size: 18px; font-weight: 700; color: var(--color-text); }
.nav__logo-sub  { font-family: var(--font-en); font-size: 9px; letter-spacing: 0.12em; color: var(--color-text-muted); margin-top: 3px; }

/* 导航链接 */
.nav__menu { margin-left: auto; }
.nav__list { display: flex; align-items: center; gap: 4px; }
.nav__link {
  padding: 8px 14px;
  font-size: 14px;
  color: var(--color-text-muted);
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
}
.nav__link:hover,
.nav__link.active {
  color: var(--color-text);
  background: rgba(255,255,255,0.06);
}

.nav__cta { margin-left: 8px; padding: 9px 20px; font-size: 14px; }

/* 汉堡按钮 */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  margin-left: auto;
}
.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}
.nav__hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__hamburger.open span:nth-child(2) { opacity: 0; }
.nav__hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 移动端抽屉 */
.nav__drawer {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10,14,26,0.97);
  backdrop-filter: blur(20px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.nav__drawer.open {
  opacity: 1;
  pointer-events: auto;
}
.nav__drawer-list { display: flex; flex-direction: column; gap: 8px; text-align: center; }
.nav__drawer-link {
  display: block;
  padding: 14px 32px;
  font-size: 20px;
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: 10px;
  transition: color var(--transition), background var(--transition);
}
.nav__drawer-link:hover { color: var(--color-text); background: rgba(255,255,255,0.06); }
.nav__drawer-link--cta {
  margin-top: 16px;
  background: var(--grad-primary);
  color: #fff !important;
}