/* ===================================
   VEX Platform 统一导航栏
   =================================== */

.platform-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-nav);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.platform-nav__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* 左侧：品牌 */
.platform-nav__brand {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  text-decoration: none;
}

.platform-nav__brand:hover .platform-nav__logo {
  transform: scale(1.05);
}

.platform-nav__logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
  transition: transform var(--transition-fast), filter var(--transition-normal);
}

.platform-nav__brand-text {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}

.platform-nav__brand-sep {
  color: var(--text-muted);
  margin: 0 0.05em;
}

/* 中间：导航链接 */
.platform-nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  list-style: none;
}

.platform-nav__link {
  padding: 0.4rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.platform-nav__link:hover {
  color: var(--text-primary);
  background: var(--bg-input);
}

.platform-nav__link.active {
  color: var(--brand-primary);
  background: rgba(233, 69, 96, 0.1);
}

/* 右侧：操作区 */
.platform-nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* 语言切换按钮 */
.lang-toggle {
  padding: 0.2rem 0.5rem;
  font-size: 0.72rem;
  font-family: inherit;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  letter-spacing: 0.02em;
  line-height: 1.4;
}

.lang-toggle:hover {
  border-color: var(--text-muted);
  color: var(--text-primary);
}

/* 移动端汉堡菜单 */
.platform-nav__mobile-btn {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  border-radius: var(--radius-sm);
}

.platform-nav__mobile-btn svg {
  width: 24px;
  height: 24px;
}

/* 移动端样式 */
@media (max-width: 768px) {
  .platform-nav__links {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-nav);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: var(--space-sm) var(--space-md);
    gap: var(--space-xs);
  }

  .platform-nav__links.open {
    display: flex;
  }

  .platform-nav__link {
    padding: 0.6rem 0.75rem;
    width: 100%;
  }

  .platform-nav__mobile-btn {
    display: flex;
  }
}