/* --- 基础设置 --- */
 :root {
     --bg-color: #03031E;
     --accent-color: #5E50CE;
     --accent-glow: rgba(94, 80, 206, 0.6);
     --text-main: #FFFFFF;
     --text-muted: #A0A0C0;
     --glass-bg: rgba(255, 255, 255, 0.03);
     --glass-border: rgba(255, 255, 255, 0.08);
 }

 /* 1. 悬浮按钮容器 */
 .fab-container {
     position: fixed;
     bottom: 2rem;
     left: 2rem;
     z-index: 1102;
     display: flex;
     justify-content: flex-end;
     gap: 15px;
 }

 /* 2. Tooltip 提示文字 */
 .fab-tooltip {
     margin-top: 1rem;
     background: rgba(255, 255, 255, 0.1);
     backdrop-filter: blur(10px);
     padding: 8px 16px;
     border-radius: 8px;
     color: #fff;
     font-size: 0.9rem;
     font-weight: 500;
     white-space: nowrap;
     opacity: 0;
     transform: translateX(-20px);
     transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
     pointer-events: none;
     border: 1px solid rgba(255, 255, 255, 0.1);
     box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
     display: flex;
     align-items: center;
     justify-content: center;
     height: 2.5rem;
 }

 .fab-left {
     display: flex;
     flex-direction: column;
     align-items: center;
     justify-content: center;
     gap: 8px;
 }

 .fab-left-text {
     font-size: 0.9rem;
     font-weight: 500;
     white-space: nowrap;
     color: #fff;
 }

 /* 鼠标悬停容器时显示 Tooltip */
 .fab-container:hover .fab-tooltip {
     opacity: 1;
     transform: translateX(0);
 }

 /* 3. 圆形按钮主体 */
 .fab-button {
     width: 60px;
     height: 60px;
     border-radius: 50%;
     background: linear-gradient(135deg, #5E50CE, #4a3b9e);
     border: none;
     cursor: pointer;
     display: flex;
     align-items: center;
     justify-content: center;
     box-shadow: 0 0 20px var(--accent-glow);
     transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
     position: relative;
     overflow: hidden;
 }

 .fab-button:hover {
     transform: scale(1.1) rotate(90deg);
     box-shadow: 0 0 30px var(--accent-glow);
 }

 .fab-button svg {
     width: 28px;
     height: 28px;
     fill: none;
     stroke: white;
     stroke-width: 2.5;
     stroke-linecap: round;
     stroke-linejoin: round;
     transition: transform 0.3s ease;
 }

 .faq-overlay {
     position: fixed;
     top: 0;
     left: 0;
     width: 100vw;
     height: 100vh;
     background-color: var(--bg-color);
     z-index: 1101;

     /* 关键：初始状态为右下角的一个点 */
     clip-path: circle(0% at 0 100%);

     /* 平滑过渡 */
     transition: clip-path 0.6s cubic-bezier(0.77, 0, 0.175, 1);

     /* 隐藏溢出内容 */
     overflow: hidden;

     /* 修改点 1: 移除 visibility，改用 pointer-events 控制交互 */
     pointer-events: none;

     /* 可选：提升动画性能 */
     will-change: clip-path;
 }

 /* 激活状态：展开至覆盖全屏 */
 .faq-overlay.active {
     clip-path: circle(150% at 100% 100%);
     /* 修改点 2: 允许交互 */
     pointer-events: auto;
     /* 移除 visibility: visible */
 }

 /* 5. 覆盖层内的内容区域 */
 .overlay-content {
     height: 100%;
     width: 100%;
     overflow-y: scroll;
     /* 允许内部滚动 */
     padding: 80px 20px 40px 20px;
     opacity: 0;
     transform: translateY(50px);
     transition: opacity 0.4s ease 0.2s, transform 0.4s ease 0.2s;
     /* 延迟显示，等背景展开 */
 }

 .faq-overlay.active .overlay-content {
     opacity: 1;
     transform: translateY(0);
 }

 /* --- FAQ 内部样式 (复用之前的风格) --- */
 .container {
     max-width: 800px;
     margin: 0 auto;
 }

 header {
     text-align: center;
     margin-bottom: 50px;
     position: relative;
 }

 /* 关闭按钮 (X) */
 .close-btn {
     position: absolute;
     top: -60px;
     right: 0;
     background: transparent;
     border: none;
     color: var(--text-muted);
     cursor: pointer;
     transition: color 0.3s;
     display: flex;
     align-items: center;
     gap: 8px;
     font-size: 0.9rem;
 }

 .close-btn:hover {
     color: white;
 }

 .close-btn svg {
     width: 20px;
     height: 20px;
 }

 h1 {
     font-size: 2.5rem;
     font-weight: 700;
     background: linear-gradient(135deg, #fff 0%, #b4aaff 100%);
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent;
     margin-bottom: 12px;
 }

 .subtitle {
     color: var(--text-muted);
 }

 /* 搜索框 */
 .search-wrapper {
     position: relative;
     max-width: 500px;
     margin: 0 auto 40px auto;
 }

 .search-input {
     width: 100%;
     padding: 16px 20px 16px 50px;
     background: rgba(255, 255, 255, 0.05);
     border: 1px solid var(--glass-border);
     border-radius: 50px;
     color: white;
     font-size: 1rem;
     outline: none;
     transition: all 0.3s;
 }

 .search-input:focus {
     border-color: var(--accent-color);
     box-shadow: 0 0 20px rgba(94, 80, 206, 0.2);
 }

 .search-icon {
     position: absolute;
     left: 20px;
     top: 50%;
     transform: translateY(-50%);
     color: var(--text-muted);
 }

 /* FAQ 列表 */
 .faq-list {
     display: flex;
     flex-direction: column;
     gap: 16px;
 }

 .faq-item {
     background: var(--glass-bg);
     border: 1px solid var(--glass-border);
     border-radius: 12px;
     overflow: hidden;
     transition: all 0.3s;
 }

 .faq-item:hover {
     border-color: rgba(255, 255, 255, 0.2);
     transform: translateY(-2px);
 }

 .faq-question {
     width: 100%;
     text-align: left;
     background: none;
     border: none;
     padding: 24px;
     color: var(--text-main);
     font-size: 1.05rem;
     font-weight: 500;
     cursor: pointer;
     display: flex;
     justify-content: space-between;
     align-items: center;
 }

 .icon {
     width: 20px;
     height: 20px;
     position: relative;
     flex-shrink: 0;
     transition: transform 0.3s;
 }

 .icon::before,
 .icon::after {
     content: '';
     position: absolute;
     background-color: var(--accent-color);
     border-radius: 2px;
     transition: all 0.3s;
 }

 .icon::before {
     top: 50%;
     left: 0;
     width: 100%;
     height: 2px;
     transform: translateY(-50%);
 }

 .icon::after {
     top: 0;
     left: 50%;
     width: 2px;
     height: 100%;
     transform: translateX(-50%);
 }

 .faq-item.active .icon {
     transform: rotate(45deg);
 }

 .faq-item.active .icon::before,
 .faq-item.active .icon::after {
     background-color: #fff;
 }

 .faq-answer {
     max-height: 0;
     overflow: hidden;
     transition: max-height 0.4s cubic-bezier(0, 1, 0, 1);
     background: rgba(94, 80, 206, 0.03);
 }

 .faq-answer p {
     padding: 0 24px 24px 24px;
     color: var(--text-muted);
     font-size: 0.95rem;
 }

 /* 分页器 */
 .pagination-container {
     margin-top: 40px;
     display: flex;
     justify-content: center;
     gap: 8px;
     flex-wrap: wrap;
 }

 .page-btn {
     background: transparent;
     border: 1px solid var(--glass-border);
     color: var(--text-muted);
     width: 40px;
     height: 40px;
     border-radius: 8px;
     cursor: pointer;
     transition: all 0.2s;
     display: flex;
     align-items: center;
     justify-content: center;
 }

 .page-btn:hover:not(:disabled) {
     border-color: var(--accent-color);
     color: white;
     background: rgba(94, 80, 206, 0.1);
 }

 .page-btn.active {
     background: var(--accent-color);
     border-color: var(--accent-color);
     color: white;
     box-shadow: 0 0 15px var(--accent-glow);
 }

 .page-btn:disabled {
     opacity: 0.3;
     cursor: not-allowed;
 }

 .no-results {
     text-align: center;
     color: var(--text-muted);
     padding: 40px;
     display: none;
 }

 /* 滚动条美化 */
 .overlay-content::-webkit-scrollbar {
     width: 8px;
 }

 .overlay-content::-webkit-scrollbar-track {
     background: transparent;
 }

 .overlay-content::-webkit-scrollbar-thumb {
     background: rgba(255, 255, 255, 0.1);
     border-radius: 4px;
 }

 .overlay-content::-webkit-scrollbar-thumb:hover {
     background: rgba(255, 255, 255, 0.2);
 }