* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', sans-serif;
            background-color: #e0e5ec;
            overflow-x: hidden;
        }

        /* ========== 顶部导航 (完全复刻首页风格) ========== */
        .ys-hd-pc {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 99;
            background: transparent;
            transition: all 0.3s ease;
            padding: 18px 40px;
        }
        body.scrolled .ys-hd-pc {
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(8px);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
        }
        .mod-head {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .head-logo-link img {
            height: 48px;
            transition: opacity 0.25s;
        }
        .head-logo-link img:first-child {
            display: block;
        }
        .head-logo-link img:last-child {
            display: none;
        }
        body.scrolled .head-logo-link img:first-child {
            display: none;
        }
        body.scrolled .head-logo-link img:last-child {
            display: block;
        }
        .head-other {
            display: flex;
            align-items: center;
            gap: 18px;
        }
        .head-nav {
            display: flex;
            list-style: none;
            gap: 28px;
            margin: 0;
            padding: 0;
        }
        .head-nav-item a {
            text-decoration: none;
            color: white;
            font-weight: 500;
            font-size: 1rem;
            transition: color 0.25s;
            letter-spacing: 0.5px;
        }
        body.scrolled .head-nav-item a {
            color: #1a1f2e;
        }
        .head-nav-item a:hover {
            color: #00e0ff;
        }
        .head-other-more {
            margin-left: 0;
            position: relative;
        }
        .head-other-more a {
            background: linear-gradient(135deg, #00e0ff, #0088ff);
            padding: 8px 24px;
            border-radius: 40px;
            color: white;
            text-decoration: none;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all 0.25s;
            display: inline-block;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
            white-space: nowrap;
        }
        .head-other-more a:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 14px rgba(0,160,255,0.35);
            background: linear-gradient(135deg, #00f0ff, #0095ff);
        }
        @media (max-width: 1100px) {
            .head-nav { gap: 18px; }
            .head-other { gap: 16px; }
            .head-nav-item a { font-size: 0.9rem; }
        }
        @media (max-width: 900px) {
            .head-nav { display: none; }
        }
        @media (max-width: 768px) {
            .ys-hd-pc { padding: 12px 20px; }
            .head-logo-link img { height: 38px; }
        }

        /* ========== 常见问题主体 (银灰金属质感 + 细腻底纹) ========== */
        .faq-main {
            margin-top: 20px;
            padding: 40px 5% 80px;
            min-height: calc(100vh - 400px);
            background-color: #dce1e6;
            background-image: 
                linear-gradient(135deg, rgba(255,255,255,0.6) 0%, rgba(220,225,230,0.9) 100%),
                repeating-linear-gradient(45deg, rgba(0,0,0,0.02) 0px, rgba(0,0,0,0.02) 2px, transparent 2px, transparent 8px);
            position: relative;
        }
        .faq-main::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.2) 0%, rgba(0,0,0,0.02) 80%);
            pointer-events: none;
        }

        /* 页面头部 */
        .faq-header {
            text-align: center;
            margin-bottom: 50px;
            position: relative;
            z-index: 2;
        }
        .faq-header .sub {
            color: #0088cc;
            font-size: 1rem;
            letter-spacing: 4px;
            margin-bottom: 8px;
            font-weight: 500;
        }
        .faq-header h1 {
            font-size: 3rem;
            background: linear-gradient(135deg, #2c3e50, #4ca1af);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .faq-header .desc {
            color: #546e7a;
            font-size: 1.1rem;
            max-width: 700px;
            margin: 0 auto;
        }

        /* ========== 左右分栏布局 ========== */
        .faq-layout {
            display: flex;
            gap: 40px;
            position: relative;
            z-index: 2;
        }

        /* 左侧分类导航 */
        .faq-sidebar {
            flex: 0 0 280px;
            background: rgba(255, 255, 255, 0.55);
            backdrop-filter: blur(8px);
            border-radius: 32px;
            padding: 25px 20px;
            border: 1px solid rgba(255,255,255,0.5);
            box-shadow: 0 10px 25px -8px rgba(0,0,0,0.08);
            height: fit-content;
            position: sticky;
            top: 110px;
        }
        .faq-sidebar h3 {
            font-size: 1.3rem;
            color: #1e293b;
            margin-bottom: 20px;
            padding-bottom: 12px;
            border-bottom: 2px solid #00e0ff;
            display: inline-block;
        }
        .category-list {
            list-style: none;
            margin-top: 15px;
        }
        .category-list li {
            margin-bottom: 12px;
        }
        .category-btn {
            width: 100%;
            text-align: left;
            background: transparent;
            border: none;
            padding: 12px 18px;
            font-size: 1rem;
            font-weight: 500;
            color: #475569;
            cursor: pointer;
            transition: all 0.3s ease;
            border-radius: 50px;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .category-btn i {
            width: 24px;
            color: #0088cc;
            font-size: 1.1rem;
        }
        .category-btn:hover {
            background: rgba(0,224,255,0.15);
            color: #0088cc;
            transform: translateX(5px);
        }
        .category-btn.active {
            background: linear-gradient(135deg, #00e0ff, #0088ff);
            color: white;
            box-shadow: 0 4px 12px rgba(0,136,255,0.25);
        }
        .category-btn.active i {
            color: white;
        }

        /* 右侧问答列表 */
        .faq-content {
            flex: 1;
        }

        /* 问答卡片 - 金属质感玻璃态 */
        .faq-item {
            background: rgba(255, 255, 255, 0.7);
            backdrop-filter: blur(4px);
            border-radius: 28px;
            margin-bottom: 24px;
            overflow: hidden;
            transition: all 0.3s ease;
            border: 1px solid rgba(255,255,255,0.5);
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .faq-item:hover {
            background: rgba(255, 255, 255, 0.85);
            transform: translateY(-2px);
            box-shadow: 0 15px 30px -12px rgba(0,0,0,0.15);
        }

        /* 问题区域 */
        .faq-question {
            padding: 22px 28px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: all 0.2s;
        }
        .faq-question h3 {
            font-size: 1.1rem;
            font-weight: 600;
            color: #1e293b;
            margin: 0;
            flex: 1;
            line-height: 1.4;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .faq-question h3 i:first-child {
            color: #00e0ff;
            font-size: 1.2rem;
        }
        .faq-toggle {
            color: #0088cc;
            font-size: 1.2rem;
            transition: transform 0.3s ease;
            width: 28px;
            text-align: center;
        }
        .faq-item.open .faq-toggle {
            transform: rotate(180deg);
        }

        /* 答案区域 */
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            padding: 0 28px;
            border-top: none;
        }
        .faq-item.open .faq-answer {
            max-height: 600px;
            padding: 0 28px 24px 28px;
            border-top: 1px solid rgba(0,0,0,0.05);
        }
        .answer-content {
            color: #475569;
            line-height: 1.7;
            font-size: 0.95rem;
            padding-top: 18px;
        }
        .answer-content p {
            margin-bottom: 10px;
        }
        .answer-content .note {
            background: rgba(0,224,255,0.08);
            padding: 12px 16px;
            border-radius: 16px;
            margin-top: 10px;
            border-left: 3px solid #00e0ff;
            font-size: 0.9rem;
        }

        /* 无结果提示 */
        .no-faq {
            text-align: center;
            padding: 60px;
            background: rgba(255,255,255,0.6);
            border-radius: 40px;
            color: #5c6f87;
            font-size: 1.1rem;
        }

        /* 搜索框 */
        .faq-search {
            margin-bottom: 30px;
            position: relative;
        }
        .faq-search input {
            width: 100%;
            padding: 16px 24px;
            background: rgba(255,255,255,0.7);
            border: 1px solid rgba(255,255,255,0.8);
            border-radius: 60px;
            font-size: 1rem;
            color: #1e293b;
            backdrop-filter: blur(4px);
            transition: all 0.3s ease;
            outline: none;
        }
        .faq-search input:focus {
            background: rgba(255,255,255,0.9);
            border-color: #00e0ff;
            box-shadow: 0 0 0 3px rgba(0,224,255,0.2);
        }
        .faq-search input::placeholder {
            color: #94a3b8;
        }
        .faq-search i {
            position: absolute;
            right: 22px;
            top: 50%;
            transform: translateY(-50%);
            color: #0088cc;
            font-size: 1.2rem;
            pointer-events: none;
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background-color: #0f172a;
            color: rgba(255, 255, 255, 0.7);
            padding: 50px 5% 15px;
            position: relative;
            z-index: 1;
            margin-top: 0;
        }
        .footer-content {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            margin: 0 auto;
            width: 100%;
            gap: 20px;
            flex-wrap: wrap;
        }
        .footer-left { flex: 0 0 200px; }
        .footer-logo img { height: 40px; margin-bottom: 10px; filter: brightness(0) invert(1); }
        .footer-left .slogan { font-size: 0.9rem; color: #94a3b8; }
        .footer-nav { flex: 1; }
        .footer-nav h4, .footer-contact h4, .footer-qrcode h4 {
            color: #fff;
            font-size: 1.5rem;
            margin-bottom: 15px;
            font-weight: 600;
            position: relative;
            display: inline-block;
        }
        .footer-nav h4::after, .footer-contact h4::after {
            content: '';
            position: absolute;
            bottom: -6px;
            left: 0;
            width: 30px;
            height: 2px;
            background: #00e0ff;
        }
        .footer-nav ul { list-style: none; margin: 20px 0; }
        .footer-nav ul li { margin-bottom: 8px; }
        .footer-nav ul li a {
            color: #94a3b8;
            text-decoration: none;
            font-size: 1rem;
            transition: all 0.3s ease;
        }
        .footer-nav ul li a:hover { color: #00e0ff; padding-left: 5px; }
        .footer-contact { flex: 1.5; }
        .footer-contact p { margin: 20px 0; font-size: 1rem; color: #94a3b8; }
        .footer-contact i { color: #00e0ff; margin-right: 8px; width: 16px; }
        .footer-qrcode { flex: 0 0 200px; text-align: center; }
        .footer-qrcode img { width: 150px; height: 150px; background: #fff; padding: 4px; border-radius: 6px; margin-bottom: 5px; }
        .footer-qrcode p { font-size: 0.7rem; color: #64748b; }
        .copyright-bar {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 25px;
            margin-top: 20px;
            text-align: center;
            font-size: 0.9rem;
            color: #64748b;
        }
        .copyright-bar a { color: #64748b; text-decoration: none; transition: color 0.3s; }
        .copyright-bar a:hover { color: #00e0ff; }

        @media (max-width: 1024px) {
            .footer-content { gap: 15px; }
            .footer-left { flex: 0 0 150px; }
            .faq-layout {
                flex-direction: column;
            }
            .faq-sidebar {
                flex: auto;
                position: static;
                margin-bottom: 30px;
            }
            .category-list {
                display: flex;
                flex-wrap: wrap;
                gap: 10px;
            }
            .category-list li {
                margin-bottom: 0;
            }
            .category-btn {
                padding: 8px 18px;
                width: auto;
            }
        }
        @media (max-width: 768px) {
            .footer-content { flex-direction: column; align-items: center; text-align: center; }
            .footer-nav h4::after, .footer-contact h4::after { left: 50%; transform: translateX(-50%); }
            .faq-main { margin-top: 70px; padding: 30px 4% 60px; }
            .faq-header h1 { font-size: 2rem; }
            .faq-question { padding: 16px 20px; }
            .faq-question h3 { font-size: 0.95rem; }
            .category-btn { font-size: 0.85rem; }
        }