/* ========================================
   ZXTOOLX — 页头
   ======================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  background: rgba(255,255,255,.95);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

/* 品牌 */
.brand {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: .02em;
}

.brand span {
  color: var(--text-3);
  font-weight: 400;
}

/* 导航 */
nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

nav a {
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-2);
  border-radius: var(--r-sm);
  transition: all .15s;
}

nav a:hover {
  color: var(--text);
  background: var(--accent-bg);
}

nav a.active {
  color: var(--text);
  font-weight: 600;
}

/* 语言切换 */
.lang-select {
  margin-left: 8px;
  padding: 5px 8px;
  font-size: 12px;
  color: var(--text-2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  cursor: pointer;
  outline: none;
  transition: all .15s;
}

.lang-select:hover {
  border-color: var(--text-3);
}

.lang-select:focus {
  border-color: var(--text);
}

/* 登录按钮 */
.auth-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  margin-left: 8px;
  padding: 0;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--r);
  color: var(--text-2);
  cursor: pointer;
  transition: all .15s;
}

.auth-icon-btn:hover {
  color: var(--text);
  border-color: var(--text-3);
}

/* 登录模态框 */
.auth-modal {
  width: 100%;
  max-width: 400px;
  padding: 0;
  overflow: hidden;
}

.auth-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
}

.auth-tab {
  flex: 1;
  padding: 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-3);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all .15s;
  margin-bottom: -1px;
}

.auth-tab:hover {
  color: var(--text);
}

.auth-tab.active {
  color: var(--text);
  font-weight: 600;
  border-bottom-color: var(--text);
}

.auth-panel {
  display: none;
  padding: 24px;
}

.auth-panel.active {
  display: block;
}

.auth-alert {
  display: none;
  padding: 10px 14px;
  margin-bottom: 14px;
  font-size: 13px;
  border: 1px solid;
  border-radius: var(--r);
}

/* 响应式 */
@media (max-width: 768px) {
  .navbar .container {
    height: 52px;
  }
  
  nav a {
    padding: 6px 10px;
    font-size: 12px;
  }
}

@media (max-width: 480px) {
  .navbar .container {
    height: 48px;
  }
  
  nav a {
    padding: 4px 8px;
    font-size: 11px;
  }
  
  .brand {
    font-size: 14px;
  }
}