/* roulang page: index */
:root{
            --ink:#172b3a;
            --muted:#6b7d89;
            --line:#dfe8eb;
            --paper:#f6fafb;
            --white:#ffffff;
            --blue:#1769aa;
            --blue-dark:#0d4e80;
            --teal:#17a49a;
            --mint:#dff5f1;
            --yellow:#f3c969;
            --shadow:0 16px 40px rgba(25,67,86,.09);
            --shadow-sm:0 7px 18px rgba(25,67,86,.07);
            --radius:18px;
            --radius-sm:11px;
            --max:1180px;
        }
        *{box-sizing:border-box;margin:0;padding:0}
        html{scroll-behavior:smooth}
        body{font-family:"PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--ink);background:var(--paper);line-height:1.7;font-size:15px}
        a{color:inherit;text-decoration:none}
        img{display:block;width:100%;object-fit:cover}
        button,input{font:inherit}
        button{cursor:pointer;border:0}
        :focus-visible{outline:3px solid rgba(23,164,154,.35);outline-offset:3px}
        .container{width:min(calc(100% - 40px),var(--max));margin:auto}
        .topline{height:4px;background:var(--teal)}
        header{height:78px;background:rgba(255,255,255,.94);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;backdrop-filter:blur(14px)}
        .nav-wrap{height:100%;display:flex;align-items:center;justify-content:space-between;gap:25px}
        .brand{display:flex;align-items:center;gap:11px;min-width:max-content;font-weight:800;letter-spacing:.2px}
        .brand-mark{width:35px;height:35px;border-radius:10px;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:900;font-size:17px;box-shadow:0 6px 14px rgba(23,105,170,.22)}
        .brand-name{font-size:17px}
        nav{display:flex;align-items:center;gap:26px}
        nav a{font-size:14px;color:#5d707b;position:relative;padding:28px 0}
        nav a:after{content:"";position:absolute;height:2px;left:0;right:100%;bottom:19px;background:var(--teal);transition:.25s}
        nav a:hover,nav a.active{color:var(--blue-dark)}
        nav a:hover:after,nav a.active:after{right:0}
        .nav-search{display:flex;align-items:center;gap:7px;border:1px solid var(--line);border-radius:30px;padding:7px 12px;background:#fff}
        .nav-search input{width:105px;border:0;outline:0;color:var(--ink);font-size:13px}
        .nav-search button{background:transparent;color:var(--blue);font-size:16px}
        .menu-toggle{display:none;background:transparent;font-size:23px;color:var(--blue)}
        main{overflow:hidden}
        .hero{background:#eaf5f7;border-bottom:1px solid var(--line);padding:34px 0 38px}
        .hero-strip{display:grid;grid-template-columns:1fr auto;align-items:center;gap:30px;min-height:205px}
        .eyebrow,.section-kicker{color:var(--teal);font-size:12px;font-weight:800;letter-spacing:1.4px;text-transform:uppercase;margin-bottom:10px}
        h1{font-size:clamp(29px,4vw,48px);line-height:1.18;letter-spacing:-1px;max-width:700px}
        h1 span{color:var(--blue)}
        .hero p{max-width:670px;color:#5b717d;margin:16px 0 22px;font-size:16px}
        .hero-actions{display:flex;gap:12px;flex-wrap:wrap}
        .btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:11px 19px;border-radius:10px;font-weight:700;transition:.2s;border:1px solid transparent}
        .btn-primary{background:var(--blue);color:#fff;box-shadow:0 7px 15px rgba(23,105,170,.18)}
        .btn-primary:hover{background:var(--blue-dark);transform:translateY(-2px)}
        .btn-light{background:#fff;color:var(--blue);border-color:#cbdfe6}
        .btn-light:hover{border-color:var(--teal);color:var(--blue-dark)}
        .hero-metrics{display:flex;gap:24px;border-left:1px solid #c9dfe2;padding-left:28px}
        .metric strong{font-size:27px;display:block;color:var(--blue-dark);line-height:1.2}
        .metric span{font-size:12px;color:var(--muted)}
        section{padding:72px 0}
        section.alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
        .section-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:25px}
        .section-head h2{font-size:27px;line-height:1.3;letter-spacing:-.4px}
        .section-head p{max-width:630px;color:var(--muted);font-size:14px}
        .text-link{color:var(--blue);font-weight:700;font-size:13px;white-space:nowrap}
        .text-link:hover{color:var(--teal)}
        .resource-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
        .resource-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);transition:.25s}
        .resource-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:#b7dce1}
        .thumb{height:166px;position:relative;overflow:hidden}
        .thumb img{height:100%;transition:.35s}
        .resource-card:hover .thumb img{transform:scale(1.05)}
        .badge{position:absolute;top:12px;left:12px;background:rgba(255,255,255,.94);color:var(--blue-dark);border-radius:6px;padding:3px 8px;font-size:11px;font-weight:800}
        .badge.teal{color:#087d76}
        .card-body{padding:14px 15px 16px}
        .card-title{font-size:16px;font-weight:800;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
        .card-desc{color:var(--muted);font-size:12px;margin-top:5px;min-height:42px}
        .card-meta{display:flex;align-items:center;justify-content:space-between;margin-top:12px;padding-top:10px;border-top:1px solid #edf2f3;color:var(--muted);font-size:12px}
        .score{color:#d08a24;font-weight:800}
        .feature-row{display:grid;grid-template-columns:1.35fr 1fr 1fr;gap:18px}
        .feature-card{position:relative;min-height:295px;border-radius:var(--radius);overflow:hidden;color:#fff;background:#123f58}
        .feature-card img{height:100%;position:absolute;inset:0;z-index:0}
        .feature-card:after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(9,35,51,.86),rgba(9,35,51,.05) 75%)}
        .feature-content{position:absolute;z-index:1;bottom:0;padding:22px}
        .feature-content h3{font-size:21px;line-height:1.3;margin-bottom:7px}
        .feature-content p{font-size:13px;color:#dcecef}
        .feature-card:not(:first-child) .feature-content h3{font-size:17px}
        .category-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
        .category{padding:22px 17px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);transition:.2s}
        .category:hover{border-color:var(--teal);box-shadow:var(--shadow-sm);transform:translateY(-3px)}
        .category-icon{width:35px;height:35px;border-radius:9px;background:var(--mint);color:#087d76;display:grid;place-items:center;font-size:18px;margin-bottom:14px}
        .category h3{font-size:16px;margin-bottom:6px}
        .category p{font-size:12px;color:var(--muted);line-height:1.7}
        .split-section{display:grid;grid-template-columns:.85fr 1.15fr;gap:52px;align-items:center}
        .split-section h2{font-size:29px;line-height:1.35;margin-bottom:15px}
        .split-section>div>p{color:var(--muted);font-size:14px}
        .note-list{margin-top:23px;display:grid;gap:13px}
        .note-list li{display:flex;gap:12px;align-items:flex-start;list-style:none;font-size:13px}
        .check{width:22px;height:22px;flex:0 0 22px;background:var(--mint);color:#087d76;border-radius:50%;display:grid;place-items:center;font-weight:900}
        .collection-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
        .collection{background:#f1f7f8;border:1px solid #dcebed;border-radius:var(--radius);padding:19px}
        .collection-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:15px}
        .collection h3{font-size:17px}
        .collection small{color:var(--teal);font-weight:700}
        .collection-items{display:grid;gap:11px}
        .collection-item{display:flex;gap:11px;align-items:center}
        .collection-item img{width:62px;height:46px;border-radius:7px}
        .collection-item strong{font-size:13px;display:block}
        .collection-item span{font-size:11px;color:var(--muted)}
        .rank-wrap{display:grid;grid-template-columns:1fr 1fr;gap:16px}
        .rank-list{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
        .rank-item{display:grid;grid-template-columns:35px 1fr auto auto;gap:11px;align-items:center;padding:13px 17px;border-bottom:1px solid #edf2f3}
        .rank-item:last-child{border:0}
        .rank-no{font-weight:900;color:#a3b3ba;font-size:17px}
        .rank-no.top{color:#d18c29}
        .rank-title{font-weight:700;font-size:14px}
        .rank-type{font-size:11px;color:#09847b;background:var(--mint);padding:3px 7px;border-radius:5px}
        .rank-hot{font-size:12px;color:var(--muted)}
        .news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
        .news-card{display:flex;gap:13px;background:#fff;border:1px solid var(--line);padding:12px;border-radius:var(--radius-sm);transition:.2s}
        .news-card:hover{box-shadow:var(--shadow-sm);border-color:#b7dce1}
        .news-card img{width:100px;height:76px;border-radius:8px}
        .news-card h3{font-size:14px;line-height:1.5}
        .news-card time{display:block;color:var(--muted);font-size:11px;margin-top:8px}
        .assurance{background:#123f58;color:#fff}
        .assurance .section-kicker{color:#6bd4c9}
        .assurance h2{font-size:28px}
        .assurance p{color:#c8dce2;max-width:680px;margin-top:9px}
        .assure-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:28px}
        .assure{border:1px solid rgba(255,255,255,.16);border-radius:var(--radius-sm);padding:18px;background:rgba(255,255,255,.06)}
        .assure strong{display:block;font-size:16px;margin-bottom:5px}
        .assure span{font-size:12px;color:#bdd4da}
        .answers{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}
        .answer{padding:20px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm)}
        .answer h3{font-size:15px;margin-bottom:7px}
        .answer p{color:var(--muted);font-size:13px}
        .entry{background:#e9f5f4;border-top:1px solid #d5eae8;padding:50px 0}
        .entry-wrap{display:flex;justify-content:space-between;align-items:center;gap:28px}
        .entry h2{font-size:26px;margin-bottom:7px}
        .entry p{color:var(--muted);font-size:14px}
        .entry form{display:flex;gap:8px}
        .entry input{width:240px;border:1px solid #c5dcdf;border-radius:9px;padding:11px 13px;outline:0;background:#fff}
        .entry input:focus{border-color:var(--teal)}
        footer{background:#102f40;color:#c3d5db;padding:47px 0 24px}
        .footer-grid{display:grid;grid-template-columns:1.45fr 1fr 1fr 1fr;gap:35px;padding-bottom:36px;border-bottom:1px solid rgba(255,255,255,.13)}
        footer .brand{color:#fff;margin-bottom:15px}
        footer .brand-mark{background:var(--teal)}
        footer p{font-size:13px;color:#9fb9c1;max-width:280px}
        footer h3{font-size:14px;color:#fff;margin-bottom:13px}
        footer li{list-style:none;font-size:13px;line-height:2.1;color:#a9c0c7}
        footer a:hover{color:#6bd4c9}
        .copyright{padding-top:19px;font-size:12px;color:#88a4ad;display:flex;justify-content:space-between;gap:12px}
        @media(max-width:1024px){
            .resource-grid{grid-template-columns:repeat(3,1fr)}
            .category-grid{grid-template-columns:repeat(3,1fr)}
            .hero-metrics{padding-left:18px;gap:15px}
            nav{gap:16px}
            .nav-search{display:none}
        }
        @media(max-width:768px){
            header{height:67px}.nav-wrap{position:relative}.menu-toggle{display:block}
            nav{display:none;position:absolute;left:0;right:0;top:67px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);padding:7px 20px;flex-direction:column;align-items:stretch;gap:0}
            nav.open{display:flex}nav a{padding:12px 0;border-bottom:1px solid #edf2f3}nav a:after{display:none}
            .hero{padding:27px 0}.hero-strip{display:block}.hero-metrics{border:0;padding:20px 0 0;margin-top:22px;border-top:1px solid #c9dfe2}
            section{padding:52px 0}.section-head{display:block}.section-head p{margin-top:9px}.text-link{display:inline-block;margin-top:12px}
            .resource-grid{grid-template-columns:repeat(2,1fr)}.feature-row{grid-template-columns:1fr 1fr}.feature-card:first-child{grid-column:1/-1}
            .split-section{grid-template-columns:1fr;gap:28px}.collection-grid,.news-grid{grid-template-columns:1fr 1fr}
            .rank-wrap{grid-template-columns:1fr}.assure-grid{grid-template-columns:repeat(2,1fr)}
            .entry-wrap{display:block}.entry form{margin-top:20px}
            .footer-grid{grid-template-columns:1fr 1fr}.copyright{display:block}.copyright span{display:block;margin-top:7px}
        }
        @media(max-width:520px){
            .container{width:min(calc(100% - 28px),var(--max))}
            h1{font-size:31px}.hero p{font-size:14px}.hero-actions .btn{flex:1}
            .resource-grid,.feature-row,.category-grid,.collection-grid,.news-grid,.answers{grid-template-columns:1fr}
            .feature-card:first-child{grid-column:auto}.feature-card{min-height:240px}.thumb{height:190px}
            .category-grid{gap:10px}.category{padding:17px}.assure-grid{grid-template-columns:1fr 1fr}
            .entry input{width:100%}.entry form{display:block}.entry form .btn{width:100%;margin-top:8px}
            .footer-grid{grid-template-columns:1fr 1fr;gap:25px}.footer-grid>div:first-child{grid-column:1/-1}
        }