/* ========== 基础样式与顶部导航 ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-height: 100vh;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  line-height: 1.5;
  overflow-x: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 4px;
  height: 4px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--accent-glow);
  border-radius: 2px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-blue);
}

/* ========== 顶部导航 ========== */
.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: var(--bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 12px;
  z-index: 100;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 600;
  white-space: nowrap;
}
.logo-icon {
  font-size: 20px;
}

.nav-search {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 4px 4px 4px 12px;
  transition: var(--transition);
  flex: 1;
  max-width: 360px;
  margin: 0 16px;
}
.nav-search:focus-within {
  border-color: var(--accent-blue);
  background: var(--bg-input-focus);
}
.nav-search input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 13px;
  flex: 1;
  min-width: 0;
}
.nav-search input::placeholder {
  color: var(--text-muted);
}
.nav-search-btn,
.nav-search-clear {
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all 0.2s;
  flex-shrink: 0;
}
.nav-search-btn {
  width: 28px;
  height: 28px;
  background: var(--bg-input);
  color: var(--accent-blue);
  font-size: 14px;
}
.nav-search-btn:hover {
  background: var(--accent-blue);
  color: #fff;
}
.nav-search-clear {
  width: 18px;
  height: 18px;
  background: var(--bg-hover);
  color: var(--text-muted);
  font-size: 11px;
  display: none;
}
.nav-search-clear.show {
  display: flex;
}
.nav-search-clear:hover {
  color: var(--text-primary);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 6px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.nav-btn:hover {
  color: var(--accent-blue);
  border-color: var(--accent-blue);
  background: var(--bg-input-focus);
}
.nav-btn.active {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

/* ========== 主内容区 ========== */
.main-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 72px 20px 40px;
}

/* 状态栏 */
.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}
.status-left {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.update-time {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
}
.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 212, 255, 0.4); }
  50% { box-shadow: 0 0 0 6px rgba(0, 212, 255, 0); }
}
.alert-badge {
  font-size: 12px;
  color: var(--tag-hot);
  background: var(--tag-hot-bg);
  border-radius: 10px;
  padding: 3px 10px;
}

/* 页脚 */
.site-footer {
  text-align: center;
  padding: 20px 0 10px;
  font-size: 12px;
  color: var(--text-muted);
}
.site-footer a {
  color: var(--text-muted);
  margin: 0 8px;
}
.site-footer a:hover {
  color: var(--accent-blue);
}

/* ---------- 分类筛选条（V1.3） ---------- */
.category-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}
.cat-chip {
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--border-color, rgba(255,255,255,0.12));
  background: var(--bg-card, rgba(255,255,255,0.04));
  color: var(--text-secondary, #aaa);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}
.cat-chip:hover {
  color: var(--text-primary, #fff);
  border-color: var(--accent-blue, #3f7fff);
}
.cat-chip.active {
  background: var(--accent-blue, #3f7fff);
  border-color: var(--accent-blue, #3f7fff);
  color: #fff;
}

@media (max-width: 768px) {
  .top-nav {
    padding: 0 12px;
    gap: 8px;
  }
  .logo span {
    display: none;
  }
  .nav-search {
    margin: 0 4px;
  }
  .nav-btn {
    padding: 6px 9px;
    font-size: 12px;
  }
  .main-content {
    padding: 68px 12px 32px;
  }
  .category-bar {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 4px;
  }
}