/* ==========================================================
   03-filter-bar.css — 分类筛选栏
   上半部分:按钮基础样式
   下半部分:折叠机构(从 works 页移植,参数与 article.js 一一对应)
   ========================================================== */

.filter-bar {
  padding: 0 48px;
  max-width: 1400px;
  margin: 0 auto 48px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.filter-btn {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  padding: 10px 24px;
  border-radius: 100px;
  cursor: pointer;
  transition: var(--transition-fast);
  font-family: inherit;
}
.filter-btn:hover {
  background: rgba(255, 255, 255, 0.9);
  color: var(--text-primary);
  border-color: rgba(0, 0, 0, 0.08);
}
.filter-btn.active {
  background: var(--brand);
  color: #1d1d1f;
  border-color: var(--brand);
  font-weight: 600;
  box-shadow: 0 4px 20px rgba(255, 192, 0, 0.3);
}

/* ==========================================================
   筛选栏折叠(从 works 页移植,参数与 article.js 一一对应)
   ========================================================== */
#filterBar {
  display: flex;
}

.filter-scroll {
  min-width: 0;
  position: relative;
  transition:
    max-width 0.55s cubic-bezier(0.22, 1, 0.36, 1),
    height 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}

/* 渐隐区锚定容器右缘:退场标签滑入此处逐渐透明 */
.filter-scroll.collapsed {
  -webkit-mask-image: linear-gradient(
    to right,
    #000 calc(100% - 0px),
    transparent
  );
  mask-image: linear-gradient(to right, #000 calc(100% - 0px), transparent);
}

.filter-track {
  display: flex;
  align-items: center;
  gap: 12px; /* ⚠️ 与 JS 中 FILTER_GAP 保持一致 */
  width: max-content;
  max-width: 100%;
}
.filter-scroll.collapsed .filter-track {
  flex-wrap: nowrap;
}
.filter-track:not(.is-collapsed) {
  flex-wrap: wrap;
}

.filter-track .filter-btn {
  flex: 0 0 auto;
  transition:
    transform 0.42s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.32s ease,
    margin-left 0.42s cubic-bezier(0.22, 1, 0.36, 1);
}
.filter-track .filter-btn.filter-hidden {
  transform: translateX(26px);
  opacity: 0;
  pointer-events: none;
  /* ⚠️ 不要写百分比负 margin!精确像素值由 JS 实测写入 */
}

.filter-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding-left: 0;
  padding-right: 0;
  width: 44px;
}

/* hidden 属性的默认 display:none 会被 .filter-toggle 的
   display:inline-flex 覆盖,这里强制夺回控制权 */
#filterBar [hidden] {
  display: none !important;
}

.toggle-chevron {
  width: 16px;
  height: 16px;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}
.filter-toggle[aria-expanded="true"] .toggle-chevron {
  transform: rotate(180deg);
}

/* ── 响应式 ── */
@media (max-width: 768px) {
  .filter-bar {
    padding: 0 24px;
    margin-bottom: 32px;
  }
}