/* roulang page: index */
:root{
            --primary:#FF5A36;
            --primary-light:#FFE4D9;
            --primary-dark:#E64A28;
            --bg-page:#FAF9F7;
            --bg-white:#FFFFFF;
            --bg-dark:#121316;
            --bg-dark-soft:#1A1B20;
            --text-main:#1D1E24;
            --text-sub:#5E6069;
            --text-weak:#91949C;
            --line-color:#E9E7E2;
            --line-hover:#CFCCC5;
            --danger:#E04B4B;
            --success:#2F9E6E;
            --radius-card:16px;
            --radius-input:14px;
            --radius-pill:999px;
            --shadow-card:0 2px 8px rgba(18,19,22,0.04);
            --shadow-hover:0 12px 32px rgba(0,0,0,0.08);
            --container-max:1200px;
            --spacing-section:120px;
            --spacing-section-md:80px;
            --spacing-section-sm:60px;
            --transition-fast:160ms ease;
            --transition-base:280ms cubic-bezier(0.2,0.8,0.3,1);
        }

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

        html{
            scroll-behavior:smooth;
            -webkit-text-size-adjust:100%;
        }

        body{
            font-family:'PingFang SC','HarmonyOS Sans','Microsoft YaHei',-apple-system,BlinkMacSystemFont,sans-serif;
            background:var(--bg-page);
            color:var(--text-main);
            line-height:1.75;
            font-size:16px;
            -webkit-font-smoothing:antialiased;
            overflow-x:hidden;
        }

        img{
            max-width:100%;
            height:auto;
            display:block;
            border-radius:12px;
            object-fit:cover;
        }

        a{
            color:inherit;
            text-decoration:none;
            transition:color var(--transition-fast),opacity var(--transition-fast);
        }

        button,
        input,
        select,
        textarea{
            font-family:inherit;
            font-size:inherit;
            color:inherit;
            border:none;
            outline:none;
            background:transparent;
        }

        button{
            cursor:pointer;
        }

        ul,
        ol{
            list-style:none;
        }

        .container{
            max-width:var(--container-max);
            margin:0 auto;
            padding-left:24px;
            padding-right:24px;
            width:100%;
        }

        .container-narrow{
            max-width:840px;
            margin:0 auto;
            padding-left:24px;
            padding-right:24px;
            width:100%;
        }

        .section{
            padding-top:var(--spacing-section);
            padding-bottom:var(--spacing-section);
            position:relative;
        }

        .section-md{
            padding-top:var(--spacing-section-md);
            padding-bottom:var(--spacing-section-md);
        }

        .section-sm{
            padding-top:var(--spacing-section-sm);
            padding-bottom:var(--spacing-section-sm);
        }

        .text-center{
            text-align:center;
        }

        .text-primary{
            color:var(--primary);
        }

        .text-weak{
            color:var(--text-weak);
        }

        /* ===== Header / Nav ===== */
        .site-header{
            position:fixed;
            top:0;
            left:0;
            width:100%;
            z-index:1000;
            background:rgba(250,249,247,0.92);
            backdrop-filter:blur(12px);
            -webkit-backdrop-filter:blur(12px);
            border-bottom:1px solid var(--line-color);
            transition:box-shadow var(--transition-fast),background var(--transition-fast);
        }

        .site-header.scrolled{
            box-shadow:0 4px 16px rgba(18,19,22,0.06);
            background:rgba(250,249,247,0.98);
        }

        .nav-wrap{
            display:flex;
            align-items:center;
            height:76px;
            gap:24px;
        }

        .logo-area{
            display:flex;
            align-items:center;
            gap:10px;
            flex-shrink:0;
            margin-right:16px;
        }

        .logo-icon{
            width:36px;
            height:36px;
            background:var(--primary);
            border-radius:50%;
            display:flex;
            align-items:center;
            justify-content:center;
            flex-shrink:0;
            box-shadow:0 2px 8px rgba(255,90,54,0.3);
        }

        .logo-icon svg{
            width:16px;
            height:16px;
            fill:#fff;
            margin-left:2px;
        }

        .logo-text{
            font-size:28px;
            font-weight:800;
            letter-spacing:-0.5px;
            color:var(--text-main);
            line-height:1.2;
            white-space:nowrap;
        }

        .nav-search{
            flex:1;
            max-width:520px;
            display:flex;
            align-items:center;
            background:var(--bg-white);
            border:1px solid var(--line-color);
            border-radius:var(--radius-pill);
            height:48px;
            padding:0 8px 0 16px;
            transition:border-color var(--transition-fast),box-shadow var(--transition-fast);
        }

        .nav-search:focus-within{
            border-color:var(--primary);
            box-shadow:0 0 0 4px rgba(255,90,54,0.12);
        }

        .nav-search-icon{
            width:18px;
            height:18px;
            flex-shrink:0;
            opacity:0.5;
            margin-right:8px;
        }

        .nav-search input{
            flex:1;
            height:100%;
            min-width:0;
            font-size:15px;
            color:var(--text-main);
            background:transparent;
        }

        .nav-search input::placeholder{
            color:var(--text-weak);
        }

        .nav-menu{
            display:flex;
            align-items:center;
            gap:4px;
            margin-left:auto;
            flex-shrink:0;
        }

        .nav-link{
            padding:8px 14px;
            font-size:15px;
            font-weight:500;
            color:var(--text-sub);
            border-radius:var(--radius-pill);
            transition:background var(--transition-fast),color var(--transition-fast);
            white-space:nowrap;
        }

        .nav-link:hover{
            color:var(--primary);
            background:var(--primary-light);
        }

        .nav-link.active{
            color:var(--primary);
            background:var(--primary-light);
            font-weight:600;
        }

        .nav-cta{
            margin-left:8px;
            display:inline-flex;
            align-items:center;
            justify-content:center;
            background:var(--primary);
            color:#fff;
            font-size:15px;
            font-weight:600;
            height:44px;
            padding:0 24px;
            border-radius:var(--radius-pill);
            transition:background var(--transition-fast),transform var(--transition-fast),box-shadow var(--transition-fast);
            white-space:nowrap;
        }

        .nav-cta:hover{
            background:var(--primary-dark);
            color:#fff;
            transform:translateY(-1px);
            box-shadow:0 4px 16px rgba(255,90,54,0.3);
        }

        .nav-cta:active{
            transform:translateY(0);
            filter:brightness(0.96);
        }

        .nav-toggle{
            display:none;
            width:42px;
            height:42px;
            align-items:center;
            justify-content:center;
            border-radius:10px;
            background:var(--bg-white);
            border:1px solid var(--line-color);
        }

        .nav-toggle-line{
            width:18px;
            height:2px;
            background:var(--text-main);
            margin:2px 0;
            border-radius:1px;
            transition:transform var(--transition-fast),opacity var(--transition-fast);
        }

        @media (max-width:900px){
            .nav-wrap{
                flex-wrap:wrap;
                height:auto;
                padding-top:10px;
                padding-bottom:10px;
                gap:10px;
            }
            .logo-area{
                margin-right:auto;
            }
            .nav-menu{
                display:none;
                width:100%;
                flex-direction:column;
                background:var(--bg-page);
                border-top:1px solid var(--line-color);
                padding:12px 0;
                gap:3px;
                margin-top:4px;
            }
            .nav-menu.open{
                display:flex;
            }
            .nav-toggle{
                display:flex;
                flex-direction:column;
                margin-left:8px;
            }
            .nav-cta{
                width:100%;
                margin:5px 0;
            }
            .nav-search{
                order:1;
                max-width:100%;
                flex-basis:100%;
            }
        }

        .mobile-only{
            display:none;
        }

        @media (max-width:520px){
            .container{
                padding-left:16px;
                padding-right:16px;
            }
        }

        /* ===== Hero / 数据看板 ===== */
        .hero-section{
            padding-top:150px;
            padding-bottom:110px;
            position:relative;
            background:linear-gradient(rgba(18,19,22,0.78),rgba(18,19,22,0.85)),url('/assets/images/backpic/back-1.jpg') center/cover no-repeat;
            color:#fff;
            overflow:hidden;
        }

        .hero-inner{
            max-width:var(--container-max);
            margin:0 auto;
            padding:0 24px;
            position:relative;
            z-index:2;
        }

        .hero-title{
            font-size:clamp(42px,7vw,88px);
            line-height:1.14;
            font-weight:800;
            letter-spacing:-1.5px;
            max-width:840px;
            margin-bottom:24px;
        }

        .hero-sub{
            font-size:20px;
            line-height:1.7;
            color:rgba(255,255,255,0.75);
            max-width:620px;
            margin-bottom:36px;
            font-weight:400;
        }

        .hero-actions{
            display:flex;
            flex-wrap:wrap;
            gap:14px;
            margin-bottom:60px;
        }

        .btn-primary-large{
            display:inline-flex;
            align-items:center;
            background:var(--primary);
            color:#fff;
            font-size:17px;
            font-weight:600;
            height:52px;
            padding:0 32px;
            border-radius:var(--radius-pill);
            transition:background var(--transition-fast),transform var(--transition-fast),box-shadow var(--transition-fast);
            border:none;
        }

        .btn-primary-large:hover{
            background:var(--primary-dark);
            color:#fff;
            transform:translateY(-2px);
            box-shadow:0 8px 28px rgba(255,90,54,0.35);
        }

        .btn-outline-light{
            display:inline-flex;
            align-items:center;
            justify-content:center;
            background:transparent;
            color:#fff;
            font-size:16px;
            font-weight:500;
            height:50px;
            padding:0 30px;
            border-radius:var(--radius-pill);
            border:1.5px solid rgba(255,255,255,0.6);
            transition:background var(--transition-fast),border-color var(--transition-fast),transform var(--transition-fast);
        }

        .btn-outline-light:hover{
            border-color:#fff;
            background:rgba(255,255,255,0.08);
            transform:translateY(-1px);
        }

        .metric-board{
            display:grid;
            grid-template-columns:repeat(4,1fr);
            gap:0;
            border-top:1px solid rgba(255,255,255,0.18);
            border-bottom:1px solid rgba(255,255,255,0.18);
            margin-top:20px;
        }

        .metric-item{
            padding:40px 24px 40px 0;
            text-align:left;
            position:relative;
        }

        .metric-item+.metric-item{
            padding-left:24px;
        }

        .metric-item+.metric-item::before{
            content:"";
            position:absolute;
            left:0;
            top:50%;
            transform:translateY(-50%);
            width:1px;
            height:60px;
            background:rgba(255,255,255,0.16);
        }

        .metric-num{
            font-size:clamp(32px,4vw,48px);
            font-weight:800;
            line-height:1.1;
            letter-spacing:-1px;
            background:linear-gradient(120deg,#fff 60%,rgba(255,255,255,0.7));
            -webkit-background-clip:text;
            background-clip:text;
            display:inline-block;
            color:transparent;
        }

        .metric-label{
            font-size:14px;
            color:rgba(255,255,255,0.6);
            margin-top:10px;
            letter-spacing:0.02em;
            font-weight:400;
        }

        .metric-unit{
            font-size:18px;
            font-weight:600;
            margin-left:2px;
        }

        @media (max-width:900px){
            .hero-section{
                padding-top:130px;
                padding-bottom:80px;
            }
            .metric-board{
                grid-template-columns:repeat(2,1fr);
                gap:0;
            }
            .metric-item:nth-child(3),
            .metric-item:nth-child(4){
                border-top:1px solid rgba(255,255,255,0.16);
            }
            .metric-item:nth-child(2n)::before{
                display:none;
            }
            .metric-item:nth-child(2)::before{
                bottom:auto;
                right:auto;
                left:0;
                top:50%;
            }
        }

        @media (max-width:520px){
            .hero-section{
                padding-top:120px;
                padding-bottom:60px;
            }
            .metric-board{
                grid-template-columns:repeat(2,1fr);
            }
            .metric-item{
                padding:28px 12px 28px 0;
            }
            .metric-item+.metric-item{
                padding-left:12px;
            }
            .metric-num{
                font-size:30px;
            }
            .hero-sub{
                font-size:17px;
                margin-bottom:28px;
            }
            .hero-actions{
                flex-direction:column;
                align-items:stretch;
                gap:10px;
            }
            .btn-primary-large,
            .btn-outline-light{
                justify-content:center;
                width:100%;
            }
        }

        /* ===== Section header ===== */
        .section-head{
            display:flex;
            align-items:flex-end;
            justify-content:space-between;
            gap:24px;
            margin-bottom:60px;
        }

        .section-tag{
            display:inline-flex;
            align-items:center;
            gap:8px;
            font-size:14px;
            font-weight:600;
            color:var(--primary);
            background:var(--primary-light);
            border-radius:var(--radius-pill);
            padding:6px 16px;
            margin-bottom:14px;
            letter-spacing:0.02em;
        }

        .section-title{
            font-size:clamp(28px,4vw,40px);
            line-height:1.25;
            font-weight:800;
            letter-spacing:-0.5px;
            margin-bottom:8px;
        }

        .section-title small{
            display:block;
            font-size:18px;
            font-weight:400;
            color:var(--text-sub);
            line-height:1.6;
            margin-top:14px;
            letter-spacing:0;
        }

        .section-desc{
            font-size:16px;
            line-height:1.8;
            color:var(--text-sub);
            max-width:520px;
        }

        .section-num{
            font-size:72px;
            font-weight:800;
            color:var(--line-color);
            line-height:1;
            letter-spacing:-3px;
            font-variant-numeric:tabular-nums;
            margin-bottom:8px;
        }

        .section-title-wrap{
            margin-bottom:60px;
        }

        .section-title-wrap.compact{
            margin-bottom:40px;
        }

        @media (max-width:768px){
            .section-head{
                flex-direction:column;
                align-items:flex-start;
                gap:16px;
                margin-bottom:40px;
            }
            .section .container{
                padding-top:0;
            }
        }

        /* ===== 服务矩阵 ===== */
        .matrix-section{
            background:var(--bg-page);
            position:relative;
        }

        .matrix-section .bg-ghost-text{
            position:absolute;
            right:-20px;
            bottom:10px;
            font-size:180px;
            font-weight:800;
            color:transparent;
            -webkit-text-stroke:1px rgba(29,30,36,0.04);
            line-height:1;
            pointer-events:none;
            user-select:none;
            z-index:0;
            letter-spacing:-6px;
        }

        .matrix-grid{
            display:grid;
            grid-template-columns:repeat(6,1fr);
            gap:24px;
        }

        .matrix-card-large{
            grid-column:span 3;
            background:var(--bg-white);
            border:1px solid var(--line-color);
            border-radius:var(--radius-card);
            padding:36px 32px;
            position:relative;
            overflow:hidden;
            box-shadow:var(--shadow-card);
            transition:transform var(--transition-base),box-shadow var(--transition-base),border-color var(--transition-fast);
        }

        .matrix-card-small{
            grid-column:span 2;
            background:var(--bg-white);
            border:1px solid var(--line-color);
            border-radius:var(--radius-card);
            padding:28px 24px;
            position:relative;
            overflow:hidden;
            box-shadow:var(--shadow-card);
            transition:transform var(--transition-base),box-shadow var(--transition-base),border-color var(--transition-fast);
        }

        .matrix-card-wide{
            grid-column:span 6;
            background:var(--bg-white);
            border:1px solid var(--line-color);
            border-radius:var(--radius-card);
            padding:36px 32px;
            box-shadow:var(--shadow-card);
            display:flex;
            align-items:center;
            gap:32px;
            transition:transform var(--transition-base),box-shadow var(--transition-base),border-color var(--transition-fast);
        }

        .matrix-card-large:hover,
        .matrix-card-small:hover,
        .matrix-card-wide:hover{
            transform:translateY(-3px);
            box-shadow:var(--shadow-hover);
            border-color:var(--line-hover);
        }

        .matrix-card-accent{
            position:absolute;
            right:-12px;
            top:-12px;
            width:88px;
            height:88px;
            background:var(--primary);
            border-radius:50%;
            opacity:0.06;
            transition:transform var(--transition-fast),opacity var(--transition-fast);
        }

        .matrix-card-large:hover .matrix-card-accent,
        .matrix-card-small:hover .matrix-card-accent{
            transform:scale(1.2);
            opacity:0.12;
        }

        .matrix-icon{
            width:46px;
            height:46px;
            background:var(--primary-light);
            border-radius:12px;
            display:flex;
            align-items:center;
            justify-content:center;
            margin-bottom:18px;
            color:var(--primary);
        }

        .matrix-icon svg{
            width:22px;
            height:22px;
            stroke:var(--primary);
            fill:none;
            stroke-width:2;
            stroke-linecap:round;
            stroke-linejoin:round;
        }

        .matrix-icon.dark{
            background:rgba(255,255,255,0.1);
            color:#fff;
        }

        .matrix-icon.dark svg{
            stroke:#fff;
        }

        .card-title{
            font-size:20px;
            font-weight:700;
            line-height:1.4;
            margin-bottom:10px;
        }

        .matrix-card-large .card-title{
            font-size:22px;
        }

        .card-desc{
            font-size:15px;
            color:var(--text-sub);
            line-height:1.7;
            margin-bottom:0;
            max-width:280px;
        }

        .card-desc.light{
            color:rgba(255,255,255,0.7);
        }

        .card-link{
            display:inline-flex;
            align-items:center;
            gap:5px;
            color:var(--primary);
            font-size:14px;
            font-weight:600;
            margin-top:16px;
            transition:gap var(--transition-fast);
        }

        .card-link:hover{
            gap:9px;
            color:var(--primary-dark);
        }

        .card-link svg{
            width:14px;
            height:14px;
            stroke:currentColor;
            stroke-width:2.4;
            fill:none;
            stroke-linecap:round;
            stroke-linejoin:round;
        }

        @media (min-width:1024px){
            .matrix-grid{
                grid-template-columns:repeat(6,1fr);
            }
        }

        @media (max-width:1023px){
            .matrix-grid{
                grid-template-columns:repeat(2,1fr);
            }
            .matrix-card-large{
                grid-column:span 1;
            }
            .matrix-card-small{
                grid-column:span 1;
            }
        }

        @media (max-width:640px){
            .matrix-grid{
                grid-template-columns:1fr;
            }
            .matrix-card-large,
            .matrix-card-small{
                grid-column:span 1;
            }
            .matrix-card-wide{
                flex-direction:column;
                align-items:flex-start;
            }
        }

        /* ===== 轮播轨道区块 ===== */
        .track-section{
            background:var(--bg-dark);
            color:#fff;
            overflow:hidden;
            position:relative;
        }

        .track-wrap{
            margin:-10px;
            overflow-x:auto;
            padding:10px;
            scrollbar-width:thin;
            scrollbar-color:rgba(255,255,255,0.3) transparent;
            -webkit-overflow-scrolling:touch;
        }

        .track-wrap::-webkit-scrollbar{
            height:4px;
        }

        .track-wrap::-webkit-scrollbar-track{
            background:rgba(255,255,255,0.06);
            border-radius:4px;
        }

        .track-wrap::-webkit-scrollbar-thumb{
            background:rgba(255,255,255,0.3);
            border-radius:4px;
        }

        .track-row{
            display:flex;
            gap:18px;
            min-width:max-content;
            padding-bottom:4px;
        }

        .track-card{
            width:270px;
            background:var(--bg-dark-soft);
            border-radius:16px;
            border:1px solid rgba(255,255,255,0.08);
            overflow:hidden;
            transition:transform var(--transition-base),border-color var(--transition-fast);
            flex-shrink:0;
        }

        .track-card:hover{
            transform:translateY(-6px);
            border-color:rgba(255,255,255,0.18);
        }

        .track-card-cover{
            position:relative;
            aspect-ratio:16/9;
            width:100%;
            overflow:hidden;
            background:var(--bg-dark);
        }

        .track-card-cover img{
            width:100%;
            height:100%;
            object-fit:cover;
            transition:transform 0.4s ease;
        }

        .track-card:hover .track-card-cover img{
            transform:scale(1.04);
        }

        .track-card-cover::after{
            content:"";
            position:absolute;
            inset:0;
            background:linear-gradient(180deg,transparent 50%,rgba(18,19,22,0.6) 100%);
            pointer-events:none;
        }

        .duration-tag{
            position:absolute;
            bottom:8px;
            right:10px;
            background:rgba(0,0,0,0.7);
            color:#fff;
            font-size:11px;
            padding:2px 8px;
            border-radius:6px;
            letter-spacing:0.03em;
            z-index:2;
        }

        .track-card-body{
            padding:14px 16px 18px;
        }

        .track-card-title{
            font-size:15px;
            font-weight:600;
            line-height:1.5;
            margin-bottom:6px;
            white-space:normal;
            overflow:hidden;
            display:-webkit-box;
            -webkit-line-clamp:2;
            -webkit-box-orient:vertical;
        }

        .track-card-meta{
            font-size:13px;
            color:rgba(255,255,255,0.5);
            display:flex;
            align-items:center;
            gap:8px;
        }

        .watch-btn-cheap{
            margin-top:12px;
            display:inline-flex;
            align-items:center;
            gap:4px;
            font-size:13px;
            color:#fff;
            background:rgba(255,90,54,0.9);
            line-height:32px;
            padding:0 12px;
            border-radius:999px;
            font-weight:600;
            transition:background var(--transition-fast),gap var(--transition-fast);
        }

        .watch-btn-cheap:hover{
            background:var(--primary-dark);
            gap:8px;
        }

        @media (max-width:768px){
            .section-head.light .section-desc{
                max-width:100%;
            }
        }

        /* ===== 结果对比 ===== */
        .compare-section{
            background:var(--bg-white);
            position:relative;
        }

        .compare-container{
            position:relative;
            background:var(--bg-page);
            border:1px solid var(--line-color);
            border-radius:24px;
            overflow:hidden;
            padding:40px;
        }

        .compare-title{
            font-size:clamp(24px,3vw,32px);
            font-weight:800;
            line-height:1.3;
            margin-bottom:8px;
        }

        .compare-subtitle{
            font-size:15px;
            color:var(--text-sub);
            line-height:1.7;
            margin-bottom:48px;
            max-width:560px;
        }

        .compare-divider{
            display:flex;
            align-items:center;
            justify-content:center;
            margin-bottom:36px;
        }

        .compare-divider .line{
            width:1px;
            height:160px;
            background:var(--line-color);
        }

        .compare-grid{
            display:grid;
            grid-template-columns:1fr 1fr;
            gap:40px;
        }

        .compare-col{
            padding:8px;
        }

        .compare-col+.compare-col{
            border-left:1px solid var(--line-color);
            padding-left:36px;
        }

        .compare-col-title{
            font-size:19px;
            font-weight:700;
            margin-bottom:20px;
            display:flex;
            align-items:center;
            gap:12px;
        }

        .compare-icon{
            width:36px;
            height:36px;
        }

        .compare-list-item{
            display:flex;
            align-items:flex-start;
            gap:10px;
            margin-bottom:14px;
            font-size:15px;
            color:var(--text-sub);
            line-height:1.7;
        }

        .compare-list-item strong{
            color:var(--text-main);
            font-weight:600;
        }

        .compare-dot{
            width:6px;
            height:6px;
            background:var(--primary);
            border-radius:50%;
            flex-shrink:0;
            margin-top:9px;
        }

        .compare-col.dim .compare-dot{
            background:var(--text-weak);
        }

        .compare-score{
            margin-top:24px;
            display:flex;
            align-items:center;
            gap:16px;
            background:var(--bg-white);
            border:1px solid var(--line-color);
            border-radius:16px;
            padding:20px 24px;
        }

        .score-num{
            font-size:42px;
            font-weight:800;
            line-height:1;
            color:var(--primary);
            font-variant-numeric:tabular-nums;
        }

        .score-text{
            font-size:14px;
            color:var(--text-sub);
            line-height:1.6;
            flex:1;
        }

        @media (max-width:900px){
            .compare-grid{
                grid-template-columns:1fr;
                gap:0;
            }
            .compare-col+.compare-col{
                border-left:none;
                border-top:1px solid var(--line-color);
                padding-left:8px;
                padding-top:36px;
                margin-top:32px;
            }
            .compare-divider .line{
                display:none;
            }
        }

        @media (max-width:600px){
            .compare-container{
                padding:24px;
                border-radius:18px;
            }
            .compare-score{
                flex-direction:column;
                align-items:flex-start;
                gap:10px;
            }
        }

        /* ===== FAQ ===== */
        .faq-section{
            background:var(--bg-page);
            position:relative;
        }

        .faq-wrap{
            max-width:820px;
            margin:0 auto;
        }

        .faq-heading-area{
            margin-bottom:40px;
            text-align:left;
        }

        .faq-heading-area .section-title{
            margin-bottom:4px;
        }

        .faq-item{
            background:var(--bg-white);
            border:1px solid var(--line-color);
            border-radius:16px;
            margin-bottom:14px;
            overflow:hidden;
            transition:border-color var(--transition-fast),box-shadow var(--transition-fast);
        }

        .faq-item:hover,
        .faq-item[data-open="true"]{
            border-color:var(--line-hover);
            box-shadow:0 4px 16px rgba(18,19,22,0.04);
        }

        .faq-question{
            width:100%;
            display:flex;
            align-items:center;
            gap:18px;
            padding:24px 24px;
            text-align:left;
            background:transparent;
            font-size:17px;
            font-weight:600;
            color:var(--text-main);
            line-height:1.5;
            min-height:76px;
            transition:color var(--transition-fast);
        }

        .faq-question:hover{
            color:var(--primary-dark);
        }

        .faq-num{
            font-size:13px;
            font-weight:500;
            color:var(--text-weak);
            font-variant-numeric:tabular-nums;
            letter-spacing:0.04em;
            margin-right:2px;
            min-width:26px;
        }

        .faq-icon{
            width:36px;
            height:36px;
            border-radius:50%;
            border:1px solid var(--line-hover);
            display:flex;
            align-items:center;
            justify-content:center;
            flex-shrink:0;
            margin-left:auto;
            position:relative;
            transition:border-color var(--transition-fast),background var(--transition-fast);
        }

        .faq-icon::before,
        .faq-icon::after{
            content:"";
            position:absolute;
            background:var(--text-weak);
            border-radius:1px;
            transition:background var(--transition-fast),transform var(--transition-fast);
        }

        .faq-icon::before{
            width:14px;
            height:2px;
        }

        .faq-icon::after{
            width:2px;
            height:14px;
        }

        .faq-question[aria-expanded="true"] .faq-icon{
            background:var(--primary);
            border-color:var(--primary);
            transform:rotate(45deg);
        }

        .faq-question[aria-expanded="true"] .faq-icon::before,
        .faq-question[aria-expanded="true"] .faq-icon::after{
            background:#fff;
        }

        .faq-answer{
            max-height:0;
            overflow:hidden;
            transition:max-height 0.4s cubic-bezier(0.2,0.8,0.3,1);
            padding:0 24px;
            line-height:1.6;
            color:var(--text-sub);
            font-size:15px;
        }

        .faq-answer-inner{
            padding:0 0 22px 44px;
            border-bottom:1px solid transparent;
        }

        .faq-item[data-open="true"] .faq-answer{
            max-height:300px;
        }

        .faq-item[data-open="true"] .faq-answer-inner{
            border-bottom-color:transparent;
        }

        @media (max-width:520px){
            .faq-question{
                padding:18px 16px;
                gap:12px;
                font-size:16px;
            }
            .faq-num{
                display:none;
            }
            .faq-answer-inner{
                padding-left:0;
            }
            .faq-answer{
                padding:0 16px;
            }
        }

        /* ===== 转化表单 ===== */
        .cta-form-section{
            background:var(--bg-dark);
            color:#fff;
            position:relative;
            overflow:hidden;
            padding-top:96px;
            padding-bottom:96px;
        }

        .cta-form-section::before{
            content:"51视频";
            position:absolute;
            right:-40px;
            bottom:-40px;
            font-size:196px;
            font-weight:800;
            opacity:0.04;
            line-height:1;
            letter-spacing:-6px;
            pointer-events:none;
            white-space:nowrap;
        }

        .cta-form-grid{
            display:grid;
            grid-template-columns:1fr 1fr;
            gap:72px;
            align-items:center;
            position:relative;
            z-index:2;
        }

        .cta-left-title{
            font-size:clamp(30px,4vw,42px);
            line-height:1.2;
            font-weight:800;
            margin-bottom:20px;
            letter-spacing:-0.5px;
        }

        .cta-left-desc{
            font-size:17px;
            line-height:1.8;
            color:rgba(255,255,255,0.72);
            margin-bottom:28px;
            max-width:420px;
        }

        .cta-points-list{
            margin-bottom:20px;
        }

        .cta-point{
            display:flex;
            align-items:center;
            gap:12px;
            padding:8px 0;
            color:rgba(255,255,255,0.85);
            font-size:15px;
        }

        .cta-point i{
            width:18px;
            height:18px;
            background:var(--primary);
            border-radius:50%;
            display:flex;
            align-items:center;
            justify-content:center;
            flex-shrink:0;
            margin-right:4px;
            position:relative;
        }

        .cta-point i::after{
            content:"";
            width:6px;
            height:3px;
            border-left:2px solid #fff;
            border-bottom:2px solid #fff;
            transform:rotate(-45deg) translateY(-1px);
            display:block;
            margin-top:-1px;
            margin-left:1px;
        }

        .form-box{
            background:#fff;
            color:var(--text-main);
            border-radius:20px;
            padding:36px;
            box-shadow:0 20px 60px rgba(0,0,0,0.25);
        }

        .form-title{
            font-size:22px;
            font-weight:700;
            margin-bottom:8px;
            color:var(--text-main);
        }

        .form-subtit{
            font-size:14px;
            color:var(--text-sub);
            margin-bottom:28px;
            line-height:1.6;
        }

        .form-field{
            margin-bottom:20px;
        }

        .form-label{
            display:block;
            font-size:14px;
            font-weight:500;
            color:var(--text-main);
            margin-bottom:8px;
        }

        .form-input,
        .form-select,
        .form-textarea{
            width:100%;
            height:46px;
            border:1px solid var(--line-color);
            border-radius:var(--radius-input);
            padding:0 16px;
            background:var(--bg-white);
            font-size:15px;
            color:var(--text-main);
            transition:border-color var(--transition-fast),box-shadow var(--transition-fast);
        }

        .form-textarea{
            height:auto;
            min-height:80px;
            padding-top:12px;
            padding-bottom:8px;
            resize:vertical;
            line-height:1.6;
        }

        .form-input:focus,
        .form-select:focus,
        .form-textarea:focus{
            border-color:var(--primary);
            box-shadow:0 0 0 4px rgba(255,90,54,0.12);
            outline:none;
        }

        .form-input::placeholder,
        .form-textarea::placeholder{
            color:var(--text-weak);
        }

        .form-submit-btn{
            width:100%;
            height:50px;
            border-radius:var(--radius-pill);
            background:var(--primary);
            color:#fff;
            font-size:16px;
            font-weight:600;
            transition:background var(--transition-fast),transform var(--transition-fast),box-shadow var(--transition-fast),filter var(--transition-fast);
            border:none;
            display:flex;
            align-items:center;
            justify-content:center;
            gap:8px;
            margin-top:8px;
        }

        .form-submit-btn:hover{
            background:var(--primary-dark);
            transform:translateY(-1px);
            box-shadow:0 8px 24px rgba(255,90,54,0.3);
        }

        .form-submit-btn:active{
            transform:translateY(0);
            filter:brightness(0.95);
        }

        .form-note{
            margin-top:14px;
            font-size:13px;
            color:var(--text-weak);
            text-align:center;
            line-height:1.5;
        }

        @media (max-width:900px){
            .cta-form-grid{
                grid-template-columns:1fr;
                gap:48px;
            }
        }

        @media (max-width:520px){
            .cta-form-section{
                padding-top:80px;
                padding-bottom:80px;
            }
            .form-box{
                padding:24px;
            }
        }

        /* ===== Footer ===== */
        .site-footer{
            background:var(--bg-dark);
            color:rgba(255,255,255,0.65);
            padding-top:70px;
            padding-bottom:40px;
            position:relative;
        }

        .footer-top{
            display:grid;
            grid-template-columns:1.5fr 2fr;
            gap:60px;
            padding-bottom:40px;
        }

        .footer-brand{
            font-size:30px;
            font-weight:800;
            color:#fff;
            display:flex;
            align-items:center;
            gap:12px;
            margin-bottom:18px;
            letter-spacing:-0.5px;
        }

        .footer-logo-icon{
            width:30px;
            height:30px;
            border-radius:50%;
            background:var(--primary);
            display:flex;
            align-items:center;
            justify-content:center;
        }

        .footer-desc{
            font-size:14px;
            line-height:1.8;
            max-width:320px;
            color:rgba(255,255,255,0.5);
            margin-top:14px;
        }

        .footer-col-title{
            font-size:14px;
            font-weight:700;
            color:#fff;
            margin-bottom:18px;
            letter-spacing:0.04em;
        }

        .footer-links-row{
            display:grid;
            grid-template-columns:repeat(3,1fr);
            gap:40px;
        }

        .footer-link{
            display:block;
            font-size:14px;
            line-height:1.6;
            color:rgba(255,255,255,0.6);
            padding:5px 0;
            transition:color var(--transition-fast),padding-left var(--transition-fast);
            border-bottom:none;
        }

        .footer-link:hover{
            color:#fff;
            padding-left:4px;
            border-bottom:none;
        }

        .footer-mid-link-single{
            flex-direction:row;
            justify-content:flex-start;
            margin-top:16px;
        }

        .footer-bottom{
            border-top:1px solid rgba(255,255,255,0.12);
            padding-top:24px;
            display:flex;
            align-items:center;
            justify-content:space-between;
            gap:12px;
            flex-wrap:wrap;
        }

        .footer-copy{
            font-size:13px;
            color:rgba(255,255,255,0.45);
        }

        .footer-icp{
            font-size:13px;
            color:rgba(255,255,255,0.35);
        }

        @media (max-width:900px){
            .footer-top{
                display:flex;
                flex-direction:column;
                gap:44px;
            }
            .footer-links-row{
                grid-template-columns:repeat(3,1fr);
                gap:24px;
            }
        }

        @media (max-width:520px){
            .footer-links-row{
                grid-template-columns:1fr;
                gap:30px;
            }
            .footer-bottom{
                flex-direction:column;
                text-align:center;
            }
        }

        /* 内容列表式区块 */
        .latest-section{
            background:var(--bg-white);
        }
        
        .latest-grid{
            display:grid;
            grid-template-columns:1.6fr 1fr;
            gap:60px;
            margin-bottom:30px;
        }

        .latest-list-item{
            padding:22px 0;
            border-bottom:1px solid var(--line-color);
            transition:padding-left var(--transition-fast);
        }

        .latest-list-item:first-child{
            padding-top:0;
        }

        .latest-list-item a{
            display:flex;
            flex-direction:column;
            gap:4px;
            color:var(--text-main);
        }

        .latest-list-item .latest-title{
            font-size:18px;
            font-weight:600;
            line-height:1.65;
            transition:color var(--transition-fast);
        }

        .latest-list-item:hover .latest-title{
            color:var(--primary);
        }

        .latest-list-item .latest-desc{
            font-size:14px;
            color:var(--text-sub);
            line-height:1.7;
            display:-webkit-box;
            -webkit-line-clamp:2;
            -webkit-box-orient:vertical;
            overflow:hidden;
        }

        .latest-list-item .latest-meta{
            font-size:13px;
            color:var(--text-weak);
            margin-top:6px;
        }

        .latest-list-item:hover{
            padding-left:14px;
        }

        .latest-side-card{
            background:#fff;
            border:1px solid var(--line-color);
            border-radius:var(--radius-card);
            overflow:hidden;
            height:100%;
            max-height:480px;
        }

        .latest-side-card .side-bg{
            min-height:150px;
            background-size:cover;
            background-position:center;
            width:100%;
            height:100%;
            max-height:200px;
            display:block;
            min-height:100px;
            position:relative;
        }

        .side-bg img{
            width:100%;
            height:100%;
            object-fit:cover;
            max-height:200px;
        }

        .latest-side-body{
            padding-top:16px;
        }

        .latest-side-label{
            font-size:12px;
            font-weight:600;
            letter-spacing:0.08em;
            color:var(--primary);
            background:var(--primary-light);
            display:inline-block;
            border-radius:999px;
            padding:2px 12px;
            margin-bottom:12px;
        }

        .side-item{
            display:block;
        }

        .side-title{
            font-size:17px;
            font-weight:700;
            line-height:1.5;
            margin-bottom:6px;
            display:-webkit-box;
            -webkit-line-clamp:2;
            -webkit-box-orient:vertical;
            overflow:hidden;
        }

        .side-meta{
            font-size:13px;
            color:var(--text-weak);
        }

        @media (max-width:768px){
            .latest-grid{
                grid-template-columns:1fr;
                gap:20px;
            }
        }

        /* 平台保障条 */
        .featurebar{
            position:relative;
            background:var(--bg-page);
            border-bottom:1px solid var(--line-color);
        }

        .featurebar-inner{
            display:flex;
            flex-wrap:wrap;
            justify-content:space-between;
            gap:28px;
            padding-top:30px;
            padding-bottom:30px;
            align-items:center;
        }

        .feature{
            display:flex;
            align-items:center;
            gap:14px;
        }

        .feature-icon{
            background:var(--primary-light);
            width:44px;
            height:44px;
            border-radius:12px;
            display:flex;
            align-items:center;
            justify-content:center;
            flex-shrink:0;
        }

        .feature-icon svg{
            color:var(--primary);
            width:22px;
            height:22px;
            stroke-width:2;
            stroke:currentColor;
            stroke-linecap:round;
            stroke-linejoin:round;
        }

        .feature-name{
            font-size:15px;
            font-weight:600;
            color:var(--text-main);
            line-height:1.4;
        }

        .feature-sub{
            font-size:13px;
            color:var(--text-weak);
            line-height:1.4;
            margin-top:2px;
        }

        @media (max-width:768px){
            .featurebar-inner{
                flex-direction:column;
                align-items:flex-start;
                gap:18px;
            }
        }
        
        [hidden]{
            display:none !important;
        }

        img::selection{
            background:transparent;
        }
        
        img{
            -webkit-user-drag:none;
        }

/* roulang page: category1 */
:root{
  --primary:#FF5A36;
  --primary-light:#FFE4D9;
  --primary-dark:#E64A28;
  --bg-page:#FAF9F7;
  --bg-white:#FFFFFF;
  --bg-dark:#121316;
  --bg-dark-soft:#1A1B20;
  --text-main:#1D1E24;
  --text-sub:#5E6069;
  --text-weak:#91949C;
  --line-color:#E9E7E2;
  --line-hover:#CFCCC5;
  --radius-card:16px;
  --radius-input:14px;
  --radius-pill:999px;
  --shadow-card:0 2px 8px rgba(18,19,22,0.04);
  --shadow-hover:0 12px 32px rgba(0,0,0,0.08);
  --container-max:1200px;
  --spacing-section:120px;
  --spacing-section-md:80px;
  --spacing-section-sm:60px;
  --transition-fast:160ms ease;
  --transition-base:280ms cubic-bezier(0.2,0.8,0.3,1);
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  font-family:'PingFang SC','HarmonyOS Sans','Microsoft YaHei',-apple-system,BlinkMacSystemFont,sans-serif;
  background:var(--bg-page);
  color:var(--text-main);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body.menu-open{overflow:hidden;}
img{max-width:100%;height:auto;display:block;border-radius:12px;object-fit:cover;}
a{color:inherit;text-decoration:none;transition:color var(--transition-fast),opacity var(--transition-fast);}
button,input,select,textarea{font-family:inherit;font-size:inherit;color:inherit;border:none;outline:none;background:transparent;}
button{cursor:pointer;}
::selection{background:var(--primary);color:#fff;}
.container{max-width:var(--container-max);margin:0 auto;padding-left:24px;padding-right:24px;width:100%;}
.container-narrow{max-width:860px;margin:0 auto;padding-left:24px;padding-right:24px;width:100%;}
.section{padding-top:var(--spacing-section);padding-bottom:var(--spacing-section);position:relative;}
.section-md{padding-top:var(--spacing-section-md);padding-bottom:var(--spacing-section-md);}
.section-sm{padding-top:var(--spacing-section-sm);padding-bottom:var(--spacing-section-sm);}
.text-center{text-align:center;}
.text-primary{color:var(--primary);}
.text-weak{color:var(--text-weak);}

/* Header */
.site-header{
  position:fixed;top:0;left:0;width:100%;z-index:1000;
  background:rgba(250,249,247,0.92);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line-color);
  transition:box-shadow var(--transition-fast),background var(--transition-fast);
}
.site-header.scrolled{
  box-shadow:0 4px 16px rgba(18,19,22,0.06);
  background:rgba(250,249,247,0.98);
}
.nav-wrap{display:flex;align-items:center;height:76px;gap:24px;}
.logo-area{display:flex;align-items:center;gap:10px;flex-shrink:0;margin-right:16px;}
.logo-icon{
  width:36px;height:36px;background:var(--primary);border-radius:50%;
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
  box-shadow:0 2px 8px rgba(255,90,54,0.3);
}
.logo-icon svg{width:16px;height:16px;fill:#fff;margin-left:2px;}
.logo-text{font-size:28px;font-weight:800;letter-spacing:-0.5px;color:var(--text-main);line-height:1.2;white-space:nowrap;}
.nav-search{
  flex:1;max-width:520px;display:flex;align-items:center;
  background:var(--bg-white);border:1px solid var(--line-color);
  border-radius:var(--radius-pill);height:48px;padding:0 8px 0 16px;
  transition:border-color var(--transition-fast),box-shadow var(--transition-fast);
}
.nav-search:focus-within{border-color:var(--primary);box-shadow:0 0 0 4px rgba(255,90,54,0.12);}
.nav-search-icon{width:18px;height:18px;flex-shrink:0;opacity:0.5;margin-right:8px;}
.nav-search input{flex:1;height:100%;min-width:0;font-size:15px;color:var(--text-main);background:transparent;}
.nav-search input::placeholder{color:var(--text-weak);}
.nav-menu{display:flex;align-items:center;gap:4px;margin-left:auto;flex-shrink:0;}
.nav-link{
  padding:8px 14px;font-size:15px;font-weight:500;color:var(--text-sub);
  border-radius:var(--radius-pill);transition:background var(--transition-fast),color var(--transition-fast);
  white-space:nowrap;
}
.nav-link:hover{color:var(--primary);background:var(--primary-light);}
.nav-link.active{color:var(--primary);background:var(--primary-light);font-weight:600;}
.nav-cta{
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--primary);color:#fff;font-size:15px;font-weight:600;
  height:44px;padding:0 24px;border-radius:var(--radius-pill);margin-left:8px;
  box-shadow:0 4px 12px rgba(255,90,54,0.24);
  transition:background var(--transition-fast),transform var(--transition-fast),box-shadow var(--transition-fast);
}
.nav-cta:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 6px 18px rgba(255,90,54,0.3);}
.nav-cta:active{transform:translateY(1px);box-shadow:none;}
.nav-cta:focus-visible,.nav-link:focus-visible,.logo-area:focus-visible{outline:2px solid var(--primary);outline-offset:2px;}
.nav-toggle{
  width:42px;height:42px;border-radius:12px;display:none;
  align-items:center;justify-content:center;flex-direction:column;gap:5px;
  background:var(--primary-light);border:1px solid transparent;transition:background var(--transition-fast);
}
.nav-toggle:hover{background:var(--primary-light);}
.nav-toggle-line{width:18px;height:2px;background:var(--text-main);border-radius:2px;transition:transform var(--transition-base),opacity var(--transition-fast);}
.nav-toggle.open .nav-toggle-line:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle.open .nav-toggle-line:nth-child(2){opacity:0;}

/* Category Hero */
.cat-hero{
  position:relative;
  background-color:var(--bg-dark);
  color:#fff;
  margin-top:76px;
  overflow:hidden;
  min-height:420px;
  display:flex;
  align-items:center;
}
.cat-hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0.55;}
.cat-hero-overlay{
  position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(18,19,22,0.9) 0%,rgba(18,19,22,0.76) 46%,rgba(18,19,22,0.6) 100%);
}
.cat-hero .container{position:relative;z-index:2;padding-top:70px;padding-bottom:80px;}
.cat-breadcrumb{display:flex;align-items:center;gap:10px;font-size:14px;color:rgba(255,255,255,0.62);margin-bottom:28px;}
.cat-breadcrumb a{display:inline-flex;align-items:center;gap:8px;transition:color var(--transition-fast);}
.cat-breadcrumb a:hover{color:var(--primary);}
.cat-breadcrumb .disabled{color:rgba(255,255,255,0.45);pointer-events:none;}
.cat-breadcrumb-sep{opacity:0.45;font-size:12px;}
.cat-hero-title{
  font-size:clamp(34px,4.6vw,52px);
  line-height:1.22;
  font-weight:800;
  letter-spacing:-1px;
  max-width:760px;
  margin-bottom:18px;
}
.cat-hero-title .accent{color:var(--primary);}
.cat-hero-desc{
  font-size:17px;
  line-height:1.85;
  color:rgba(255,255,255,0.82);
  max-width:680px;
}
.cat-hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px;}
.cat-tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:7px 16px;border-radius:999px;
  background:rgba(255,255,255,0.1);
  border:1px solid rgba(255,255,255,0.14);
  color:rgba(255,255,255,0.9);
  font-size:14px;
  transition:background var(--transition-fast),border-color var(--transition-fast);
}
.cat-tag .dot{width:5px;height:5px;border-radius:50%;background:var(--primary);flex-shrink:0;}

/* Category intro block */
.topic-intro{padding-top:var(--spacing-section);}
.topic-intro-head{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:32px;margin-bottom:44px;flex-wrap:wrap;
}
.section-kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-size:14px;color:var(--primary);font-weight:600;letter-spacing:0.4px;margin-bottom:14px;
}
.section-kicker::before{content:"";width:22px;height:2px;background:var(--primary);border-radius:2px;}
.topic-intro-title{font-size:clamp(25px,2.8vw,36px);font-weight:800;line-height:1.3;letter-spacing:-0.4px;max-width:540px;}
.topic-intro-note{color:var(--text-sub);max-width:360px;font-size:16px;line-height:1.8;}
.topic-intro-note b{color:var(--text-main);font-weight:600;}

/* Topic cards */
.topic-cards{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:32px 34px;
  align-items:start;
}
.topic-card{
  background:var(--bg-white);
  border:1px solid var(--line-color);
  border-radius:var(--radius-card);
  overflow:hidden;
  box-shadow:var(--shadow-card);
  transition:transform var(--transition-base),box-shadow var(--transition-base),border-color var(--transition-fast);
}
.topic-card:nth-child(even){margin-top:46px;}
.topic-card-link{display:block;}
.topic-card-media{position:relative;aspect-ratio:16/9;overflow:hidden;}
.topic-card-media img{position:absolute;inset:0;width:100%;height:100%;transition:transform 600ms ease;}
.topic-card:hover{border-color:var(--line-hover);box-shadow:var(--shadow-hover);transform:translateY(-3px);}
.topic-card:hover .topic-card-media img{transform:scale(1.04);}
.topic-card-badge{
  position:absolute;left:14px;top:14px;z-index:2;
  display:inline-flex;align-items:center;gap:4px;
  background:rgba(18,19,22,0.7);color:#fff;font-size:12px;
  padding:5px 12px;border-radius:999px;backdrop-filter:blur(8px);
  letter-spacing:0.2px;
}
.topic-card-body{padding:22px 22px 20px;}
.topic-card-label{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-weak);margin-bottom:10px;}
.topic-card-label .line{width:18px;height:1.5px;background:var(--primary);}
.topic-card-title{font-size:19px;font-weight:700;line-height:1.5;margin-bottom:10px;letter-spacing:-0.1px;}
.topic-card-title:hover{color:var(--primary);}
.topic-card-excerpt{font-size:15px;color:var(--text-sub);line-height:1.8;margin-bottom:14px;}
.topic-card-meta{
  display:flex;align-items:center;justify-content:space-between;
  border-top:1px solid var(--line-color);padding-top:14px;
  font-size:13px;color:var(--text-weak);
}
.topic-card-more{display:inline-flex;align-items:center;color:var(--primary);font-weight:600;font-size:14px;transition:gap var(--transition-fast);}
.topic-card-more svg{width:16px;height:16px;transition:transform var(--transition-fast);}
.topic-card:hover .topic-card-more svg{transform:translateX(4px);}

/* Category reading block */
.read-block{
  background:var(--bg-white);
  border-top:1px solid var(--line-color);
  border-bottom:1px solid var(--line-color);
  padding:70px 0;
}
.read-head{display:grid;grid-template-columns:360px 1fr;gap:48px;align-items:start;}
.read-title-number{font-size:13px;font-weight:600;color:var(--primary);letter-spacing:1px;display:flex;align-items:center;gap:8px;}
.read-title-number::before{content:"";width:24px;height:2px;background:var(--primary);}
.read-title{font-size:clamp(28px,3.6vw,44px);line-height:1.3;font-weight:800;letter-spacing:-0.5px;margin-top:16px;}
.read-summary{color:var(--text-sub);font-size:16px;line-height:1.9;margin-top:18px;}
.read-role-text{font-size:15px;line-height:2;color:var(--text-sub);}
.read-role-text strong{color:var(--text-main);font-weight:600;}
.read-story{margin-top:44px;border-top:1px solid var(--line-color);}
.read-chapter{
  display:grid;grid-template-columns:92px 1fr;gap:28px;
  padding:36px 0 30px;border-bottom:1px solid var(--line-color);
}
.chapter-num{
  font-size:15px;font-weight:700;color:var(--primary);letter-spacing:0.5px;
  font-variant-numeric:tabular-nums;line-height:1.9;
}
.chapter-body h3{font-size:20px;font-weight:700;margin-bottom:12px;line-height:1.55;}
.chapter-body p{color:var(--text-sub);line-height:2;max-width:720px;font-size:16px;}

/* Related categories */
.related-section{padding-top:var(--spacing-section);padding-bottom:var(--spacing-section);}
.related-intro{text-align:center;max-width:560px;margin:0 auto 52px;}
.related-intro h2{font-size:clamp(26px,3vw,36px);font-weight:800;letter-spacing:-0.4px;}
.related-intro .short-line{width:32px;height:2px;background:var(--primary);border-radius:2px;margin:14px auto 12px;}
.related-intro p{color:var(--text-sub);font-size:16px;line-height:1.85;}
.related-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;max-width:960px;margin:0 auto;}
.related-item{
  display:flex;flex-direction:column;align-items:center;gap:12px;
  background:var(--bg-white);border:1px Solid var(--line-color);border-radius:var(--radius-card);
  padding:24px 16px;
  transition:transform var(--transition-base),box-shadow var(--transition-base),border-color var(--transition-fast),background var(--transition-fast);
}
.related-item:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:var(--primary);}
.related-item.rel-active{background:var(--primary-light);border-color:var(--primary);}
.rel-icon{
  width:58px;height:58px;border-radius:50%;
  background:var(--bg-page);border:1px solid var(--line-color);
  display:flex;align-items:center;justify-content:center;color:var(--primary);
  transition:background var(--transition-fast),border-color var(--transition-fast);
}
.rel-icon svg{width:26px;height:26px;}
.related-item:hover .rel-icon{background:var(--primary-light);border-color:var(--primary);}
.rel-name{font-size:17px;font-weight:650;line-height:1.4;}
.rel-sub{font-size:12px;color:var(--text-weak);line-height:1.4;text-align:center;}
.rel-active .rel-sub{color:rgba(255,90,54,0.78);}

/* Footer */
.site-footer{
  background:var(--bg-dark);
  color:rgba(255,255,255,0.78);
  padding-top:60px;
  padding-bottom:28px;
}
.footer-top{display:grid;grid-template-columns:1.15fr 1.6fr;gap:56px;padding-bottom:34px;}
.footer-brand{display:flex;align-items:center;gap:12px;font-size:26px;font-weight:800;color:#fff;letter-spacing:-0.4px;}
.footer-logo-icon{
  width:30px;height:30px;border-radius:50%;background:var(--primary);
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
  box-shadow:0 2px 8px rgba(255,90,54,0.3);
}
.footer-desc{color:rgba(255,255,255,0.58);font-size:15px;line-height:1.9;margin-top:16px;max-width:360px;}
.footer-links-row{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;}
.footer-col-title{font-size:15px;font-weight:700;color:#fff;margin-bottom:14px;}
.footer-link{display:block;color:rgba(255,255,255,0.58);font-size:14px;padding:5px 0;transition:color var(--transition-fast);}
.footer-link:hover{color:var(--primary);}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,0.1);
  padding-top:26px;
  display:flex;justify-content:space-between;align-items:center;
  flex-wrap:wrap;gap:10px;
}
.footer-copy{color:rgba(255,255,255,0.44);font-size:14px;}
.footer-icp{color:rgba(255,255,255,0.3);font-size:13px;}

/* Reveal */
.reveal{opacity:0;transform:translateY(16px);transition:opacity 700ms ease,transform 700ms ease;}
.reveal.in-view{opacity:1;transform:translateY(0);}

/* Responsive */
@media (max-width:1023px){
  .container{max-width:100%;}
  .nav-wrap{gap:16px;}
  .logo-area{margin-right:6px;}
  .logo-text{font-size:24px;}
  .nav-search{max-width:360px;}
  .nav-link{padding:8px 10px;font-size:14px;}
  .nav-cta{padding:0 16px;font-size:14px;height:42px;}
  .footer-top{grid-template-columns:1fr;gap:36px;}
  .footer-links-row{grid-template-columns:1fr 1fr 1fr;}
  .read-head{grid-template-columns:280px 1fr;gap:30px;}
  .related-grid{grid-template-columns:repeat(2,1fr);}
  .topic-cards{gap:26px;}
}
@media (max-width:767px){
  .section{padding-top:64px;padding-bottom:64px;}
  .section-md{padding-top:48px;padding-bottom:48px;}
  .cat-hero{margin-top:0;min-height:0;}
  .cat-hero .container{padding-top:110px;padding-bottom:52px;}
  .cat-hero-title{font-size:31px;}
  .cat-hero-desc{font-size:15px;line-height:1.85;}
  .nav-wrap{height:auto;flex-wrap:wrap;padding-top:12px;padding-bottom:12px;gap:12px;}
  .logo-area{order:1;margin-right:0;}
  .nav-toggle{order:2;margin-left:auto;display:flex;}
  .nav-search{order:3;width:100%;max-width:none;flex-basis:100%;margin-top:0;}
  .nav-menu{
    order:4;
    flex-basis:100%;
    display:flex;
    flex-direction:column;
    align-items:flex-start;
    gap:6px;
    margin-left:0;
    background:var(--bg-white);
    border:1px solid var(--line-color);
    border-radius:16px;
    padding:12px;
    max-height:0;
    opacity:0;
    overflow:hidden;
    transition:max-height 300ms ease,opacity 300ms ease;
  }
  .nav-menu.open{max-height:400px;opacity:1;}
  .nav-link{width:100%;}
  .nav-cta{width:100%;margin-left:0;justify-content:center;margin-top:4px;}
  .topic-intro-head{flex-direction:column;align-items:flex-start;}
  .topic-cards{grid-template-columns:1fr;gap:24px;}
  .topic-card:nth-child(even){margin-top:0;}
  .topic-card-body{padding:18px 18px 16px;}
  .read-block{padding:48px 0;}
  .read-head{grid-template-columns:1fr;gap:18px;}
  .read-chapter{grid-template-columns:1fr;gap:8px;padding:28px 0;}
  .related-grid{grid-template-columns:1fr 1fr;gap:12px;}
  .related-item{padding:18px 12px;}
  .rel-name{font-size:15px;}
  .footer-top{grid-template-columns:1fr;gap:32px;}
  .footer-links-row{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;text-align:left;}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;}
  html{scroll-behavior:auto;}
  .reveal{opacity:1;transform:none;}
}