/* roulang page: index */
:root{
      --bg:#f7f4ee;
      --bg-soft:#fbfaf7;
      --surface:#ffffff;
      --ink:#121826;
      --muted:#667085;
      --subtle:#98a2b3;
      --line:#e7dfd2;
      --line-strong:#d7cbb8;
      --brand:#8b5a2b;
      --brand-2:#c87932;
      --brand-3:#f1c27d;
      --accent:#1f6f5b;
      --danger:#c2410c;
      --radius-sm:12px;
      --radius:20px;
      --radius-lg:28px;
      --shadow-sm:0 8px 24px rgba(18,24,38,.06);
      --shadow:0 18px 55px rgba(18,24,38,.10);
      --shadow-hover:0 22px 70px rgba(18,24,38,.15);
      --container:1180px;
      --nav-h:76px;
      --ease:cubic-bezier(.2,.8,.2,1);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
      color:var(--ink);
      background:
        radial-gradient(circle at 12% 6%, rgba(200,121,50,.15), transparent 32%),
        radial-gradient(circle at 80% 12%, rgba(31,111,91,.10), transparent 30%),
        linear-gradient(180deg,#fbf7ef 0%,var(--bg) 42%,#f8f7f3 100%);
      line-height:1.72;
      text-rendering:optimizeLegibility;
      -webkit-font-smoothing:antialiased;
    }
    a{color:inherit;text-decoration:none;transition:all .22s var(--ease)}
    a:hover{color:var(--brand)}
    img{max-width:100%;height:auto;display:block}
    button,input,textarea{font:inherit}
    ::selection{background:rgba(200,121,50,.22);color:var(--ink)}
    .container-xl{max-width:var(--container)}
    .site-header{
      position:sticky;
      top:0;
      z-index:1000;
      backdrop-filter:saturate(180%) blur(18px);
      background:rgba(251,250,247,.82);
      border-bottom:1px solid rgba(215,203,184,.68);
    }
    .navbar{
      min-height:var(--nav-h);
      padding:.85rem 0;
    }
    .brand-mark{
      display:inline-flex;
      align-items:center;
      gap:.72rem;
      font-weight:900;
      letter-spacing:-.03em;
      color:var(--ink);
      white-space:nowrap;
    }
    .brand-symbol{
      width:38px;
      height:38px;
      border-radius:14px;
      display:grid;
      place-items:center;
      color:#fff;
      background:linear-gradient(135deg,var(--ink),var(--brand));
      box-shadow:0 12px 28px rgba(139,90,43,.22);
      font-size:1rem;
      font-weight:800;
    }
    .brand-text{font-size:1.05rem}
    .nav-pill{
      background:rgba(255,255,255,.72);
      border:1px solid var(--line);
      border-radius:999px;
      padding:.28rem;
      box-shadow:var(--shadow-sm);
    }
    .navbar .nav-link{
      color:#475467;
      border-radius:999px;
      padding:.55rem .95rem!important;
      font-size:.94rem;
      font-weight:700;
    }
    .navbar .nav-link:hover,
    .navbar .nav-link.active{
      color:var(--ink);
      background:#fff4e4;
    }
    .command-search{
      height:42px;
      min-width:245px;
      border:1px solid var(--line);
      background:rgba(255,255,255,.82);
      border-radius:999px;
      display:flex;
      align-items:center;
      gap:.5rem;
      padding:0 .78rem;
      box-shadow:inset 0 1px 0 rgba(255,255,255,.8);
    }
    .command-search input{
      width:100%;
      border:0;
      outline:0;
      background:transparent;
      color:var(--ink);
      font-size:.9rem;
    }
    .command-key{
      border:1px solid var(--line);
      color:var(--muted);
      background:#f8f3ea;
      border-radius:8px;
      padding:.05rem .35rem;
      font-size:.76rem;
      line-height:1.4;
    }
    .navbar-toggler{
      border:1px solid var(--line);
      border-radius:14px;
      padding:.55rem .7rem;
      box-shadow:none!important;
      background:#fff;
    }
    .btn{
      border-radius:999px;
      font-weight:800;
      letter-spacing:-.01em;
      padding:.78rem 1.16rem;
      transition:all .24s var(--ease);
    }
    .btn:focus-visible,
    a:focus-visible,
    input:focus-visible{
      outline:3px solid rgba(200,121,50,.34);
      outline-offset:3px;
    }
    .btn-primary-custom{
      background:linear-gradient(135deg,var(--brand),var(--brand-2));
      border:0;
      color:#fff;
      box-shadow:0 12px 28px rgba(139,90,43,.23);
    }
    .btn-primary-custom:hover{
      transform:translateY(-2px);
      color:#fff;
      box-shadow:0 18px 36px rgba(139,90,43,.30);
    }
    .btn-ghost{
      background:#fff;
      color:var(--ink);
      border:1px solid var(--line);
    }
    .btn-ghost:hover{
      background:#fff7ec;
      border-color:#e5bf8d;
      transform:translateY(-2px);
    }
    .btn-link-soft{
      display:inline-flex;
      align-items:center;
      gap:.45rem;
      color:var(--brand);
      font-weight:850;
    }
    .section{
      padding:74px 0;
      position:relative;
    }
    .section-tight{padding:52px 0}
    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:.48rem;
      border:1px solid var(--line);
      background:rgba(255,255,255,.76);
      color:var(--brand);
      border-radius:999px;
      padding:.38rem .72rem;
      font-size:.82rem;
      font-weight:850;
      box-shadow:var(--shadow-sm);
    }
    .eyebrow::before{
      content:"";
      width:7px;
      height:7px;
      border-radius:50%;
      background:var(--accent);
      box-shadow:0 0 0 5px rgba(31,111,91,.10);
    }
    .section-title{
      font-weight:950;
      letter-spacing:-.055em;
      line-height:1.08;
      margin:14px 0 14px;
      font-size:clamp(2rem,4vw,3.85rem);
    }
    .section-desc{
      color:var(--muted);
      font-size:1.04rem;
      max-width:760px;
      margin:0;
    }
    .hero{
      padding:0 0 46px;
    }
    .hero-ribbon{
      min-height:330px;
      border-bottom:1px solid var(--line);
      background:
        linear-gradient(90deg, rgba(18,24,38,.94), rgba(74,49,31,.90)),
        radial-gradient(circle at 78% 36%, rgba(241,194,125,.45), transparent 34%);
      color:#fff;
      overflow:hidden;
      position:relative;
    }
    .hero-ribbon::after{
      content:"";
      position:absolute;
      inset:auto -8% -42% 40%;
      height:230px;
      background:radial-gradient(ellipse at center, rgba(255,255,255,.16), transparent 66%);
      transform:rotate(-6deg);
    }
    .hero-inner{
      position:relative;
      z-index:1;
      padding:54px 0 42px;
    }
    h1{
      max-width:880px;
      font-size:clamp(2.28rem,5vw,5.15rem);
      line-height:.98;
      letter-spacing:-.075em;
      font-weight:980;
      margin:16px 0 18px;
    }
    .hero-lead{
      max-width:760px;
      color:rgba(255,255,255,.78);
      font-size:1.08rem;
      margin:0;
    }
    .hero-actions{
      display:flex;
      flex-wrap:wrap;
      gap:.82rem;
      margin-top:25px;
      align-items:center;
    }
    .hero-actions .btn-ghost{
      background:rgba(255,255,255,.10);
      color:#fff;
      border-color:rgba(255,255,255,.22);
    }
    .hero-actions .btn-ghost:hover{
      background:rgba(255,255,255,.18);
      border-color:rgba(255,255,255,.36);
    }
    .hero-strip{
      margin-top:-34px;
      position:relative;
      z-index:3;
    }
    .metric-bar{
      background:rgba(255,255,255,.88);
      border:1px solid var(--line);
      border-radius:var(--radius-lg);
      box-shadow:var(--shadow);
      padding:18px;
      display:grid;
      grid-template-columns:1.1fr repeat(3,.75fr);
      gap:14px;
      backdrop-filter:blur(16px);
    }
    .metric-item{
      padding:18px 20px;
      border-radius:20px;
      background:linear-gradient(180deg,#fff,#fbf7ef);
      border:1px solid rgba(231,223,210,.76);
      min-height:104px;
      transition:all .24s var(--ease);
    }
    .metric-item:hover{transform:translateY(-3px);box-shadow:var(--shadow-sm)}
    .metric-item.featured{
      background:linear-gradient(135deg,#fff7e8,#ffffff);
    }
    .metric-label{
      color:var(--muted);
      font-size:.88rem;
      font-weight:750;
    }
    .metric-value{
      display:block;
      margin-top:7px;
      font-weight:950;
      letter-spacing:-.04em;
      font-size:clamp(1.5rem,2.4vw,2.35rem);
      color:var(--ink);
    }
    .metric-note{
      color:var(--subtle);
      font-size:.86rem;
      margin-top:4px;
    }
    .pain-grid{
      display:grid;
      grid-template-columns:.92fr 1.08fr;
      gap:22px;
      align-items:stretch;
    }
    .panel{
      background:rgba(255,255,255,.86);
      border:1px solid var(--line);
      border-radius:var(--radius-lg);
      box-shadow:var(--shadow-sm);
    }
    .pain-panel{
      padding:32px;
      background:
        linear-gradient(180deg,rgba(255,255,255,.92),rgba(255,248,238,.88));
    }
    .check-list{
      list-style:none;
      padding:0;
      margin:22px 0 0;
      display:grid;
      gap:13px;
    }
    .check-list li{
      display:flex;
      gap:.7rem;
      align-items:flex-start;
      color:#3f4756;
      font-weight:650;
    }
    .check-icon{
      flex:0 0 24px;
      width:24px;
      height:24px;
      border-radius:50%;
      display:grid;
      place-items:center;
      background:#e8f4ef;
      color:var(--accent);
      font-size:.86rem;
      font-weight:900;
    }
    .solution-stack{
      display:grid;
      gap:14px;
    }
    .solution-row{
      padding:22px;
      border-radius:22px;
      border:1px solid var(--line);
      background:#fff;
      display:grid;
      grid-template-columns:auto 1fr auto;
      gap:16px;
      align-items:center;
      transition:all .24s var(--ease);
    }
    .solution-row:hover{
      transform:translateX(4px);
      box-shadow:var(--shadow-sm);
      border-color:#e1bf8f;
    }
    .row-num{
      width:42px;
      height:42px;
      border-radius:15px;
      display:grid;
      place-items:center;
      color:#fff;
      font-weight:950;
      background:linear-gradient(135deg,var(--brand),var(--ink));
    }
    .row-title{font-weight:900;margin:0 0 2px}
    .row-desc{color:var(--muted);margin:0;font-size:.94rem}
    .badge-soft{
      border-radius:999px;
      padding:.36rem .6rem;
      font-weight:850;
      font-size:.78rem;
      color:var(--brand);
      background:#fff3df;
      border:1px solid #efd3aa;
      white-space:nowrap;
    }
    .commission-wrap{
      display:grid;
      grid-template-columns:1fr 1fr;
      gap:22px;
      margin-top:28px;
    }
    .commission-card{
      padding:28px;
      overflow:hidden;
      position:relative;
    }
    .commission-card::after{
      content:"";
      position:absolute;
      width:160px;
      height:160px;
      border-radius:50%;
      right:-70px;
      top:-70px;
      background:rgba(200,121,50,.13);
    }
    .commission-card h3,
    .material-card h3,
    .review-card h3,
    .faq-card h3{font-weight:930;letter-spacing:-.03em}
    .price-line{
      display:flex;
      align-items:flex-end;
      gap:.5rem;
      margin:18px 0 12px;
    }
    .price-line strong{
      font-size:2.65rem;
      letter-spacing:-.05em;
      line-height:1;
    }
    .price-line span{color:var(--muted);font-weight:750}
    .mini-tags{
      display:flex;
      flex-wrap:wrap;
      gap:8px;
      margin-top:20px;
    }
    .mini-tag{
      border-radius:999px;
      padding:.38rem .66rem;
      background:#f8f3ea;
      color:#6b5134;
      border:1px solid var(--line);
      font-size:.84rem;
      font-weight:760;
    }
    .materials-layout{
      display:grid;
      grid-template-columns:1.1fr .9fr;
      gap:22px;
      margin-top:28px;
    }
    .material-board{
      padding:28px;
      background:linear-gradient(135deg,#ffffff,#fff8ed);
    }
    .tool-grid{
      display:grid;
      grid-template-columns:repeat(2,1fr);
      gap:14px;
      margin-top:20px;
    }
    .tool-tile{
      border:1px solid var(--line);
      border-radius:20px;
      padding:18px;
      background:#fff;
      transition:all .24s var(--ease);
    }
    .tool-tile:hover{transform:translateY(-3px);box-shadow:var(--shadow-sm)}
    .tool-icon{
      width:38px;
      height:38px;
      border-radius:14px;
      display:grid;
      place-items:center;
      color:#fff;
      background:var(--accent);
      margin-bottom:12px;
      font-weight:900;
    }
    .tool-title{font-weight:900;margin-bottom:4px}
    .tool-desc{color:var(--muted);font-size:.92rem;margin:0}
    .invite-card{
      padding:30px;
      background:#121826;
      color:#fff;
      position:relative;
      overflow:hidden;
    }
    .invite-card::before{
      content:"";
      position:absolute;
      inset:-40% -35% auto auto;
      width:260px;
      height:260px;
      border-radius:50%;
      background:rgba(241,194,125,.22);
    }
    .invite-card > *{position:relative;z-index:1}
    .progress{
      height:12px;
      background:rgba(255,255,255,.15);
      border-radius:999px;
      overflow:hidden;
      margin:18px 0 12px;
    }
    .progress-bar{
      background:linear-gradient(90deg,var(--brand-3),var(--brand-2));
      border-radius:999px;
    }
    .invite-steps{
      display:grid;
      gap:10px;
      margin-top:18px;
    }
    .invite-step{
      display:flex;
      justify-content:space-between;
      gap:12px;
      padding:12px 0;
      border-bottom:1px solid rgba(255,255,255,.12);
      color:rgba(255,255,255,.76);
      font-weight:700;
    }
    .invite-step strong{color:#fff}
    .leaderboard{
      margin-top:28px;
      display:grid;
      grid-template-columns:.88fr 1.12fr;
      gap:22px;
      align-items:start;
    }
    .rank-list{
      padding:10px;
    }
    .rank-row{
      display:grid;
      grid-template-columns:40px 1fr auto;
      gap:12px;
      align-items:center;
      padding:14px;
      border-radius:18px;
      transition:all .22s var(--ease);
    }
    .rank-row + .rank-row{border-top:1px solid var(--line)}
    .rank-row:hover{background:#fff7eb}
    .rank-no{
      width:34px;
      height:34px;
      border-radius:13px;
      display:grid;
      place-items:center;
      background:#f4eadc;
      color:var(--brand);
      font-weight:950;
    }
    .rank-name{font-weight:900}
    .rank-desc{font-size:.86rem;color:var(--muted)}
    .rank-score{font-weight:950;color:var(--accent)}
    .campaign{
      padding:32px;
      border-radius:var(--radius-lg);
      background:
        linear-gradient(135deg,#1f6f5b,#153f38),
        radial-gradient(circle at 80% 10%, rgba(241,194,125,.4), transparent 35%);
      color:#fff;
      overflow:hidden;
      position:relative;
    }
    .campaign-grid{
      display:grid;
      grid-template-columns:1fr 1fr 1fr;
      gap:14px;
      margin-top:22px;
    }
    .campaign-item{
      background:rgba(255,255,255,.10);
      border:1px solid rgba(255,255,255,.18);
      border-radius:20px;
      padding:18px;
    }
    .campaign-item b{display:block;margin-bottom:6px}
    .campaign-item p{margin:0;color:rgba(255,255,255,.75);font-size:.92rem}
    .briefing{
      display:grid;
      grid-template-columns:.9fr 1.1fr;
      gap:22px;
      align-items:stretch;
    }
    .brief-cover{
      min-height:310px;
      border-radius:var(--radius-lg);
      background:
        linear-gradient(160deg,rgba(18,24,38,.22),rgba(18,24,38,.78)),
        linear-gradient(135deg,#e8d6bc,#ffffff);
      padding:28px;
      color:#fff;
      display:flex;
      flex-direction:column;
      justify-content:space-between;
      box-shadow:var(--shadow);
      overflow:hidden;
      position:relative;
    }
    .brief-cover::after{
      content:"";
      position:absolute;
      width:220px;
      height:220px;
      border:1px solid rgba(255,255,255,.25);
      border-radius:46px;
      right:-80px;
      bottom:-75px;
      transform:rotate(18deg);
    }
    .countdown{
      display:flex;
      gap:10px;
      flex-wrap:wrap;
      position:relative;
      z-index:1;
    }
    .time-box{
      min-width:66px;
      border-radius:16px;
      background:rgba(255,255,255,.14);
      border:1px solid rgba(255,255,255,.22);
      padding:10px;
      text-align:center;
      backdrop-filter:blur(8px);
    }
    .time-box strong{display:block;font-size:1.35rem;line-height:1}
    .time-box span{font-size:.76rem;color:rgba(255,255,255,.72)}
    .brief-list{
      padding:30px;
    }
    .brief-list ul{
      list-style:none;
      padding:0;
      margin:20px 0 0;
      display:grid;
      gap:12px;
    }
    .brief-list li{
      display:flex;
      gap:12px;
      padding:14px;
      border-radius:18px;
      background:#fbf7ef;
      border:1px solid var(--line);
      color:#45505f;
      font-weight:650;
    }
    .info-layout{
      display:grid;
      grid-template-columns:1.35fr .65fr;
      gap:22px;
      margin-top:28px;
    }
    .article-list{
      padding:14px;
    }
    .article-link{
      display:grid;
      grid-template-columns:120px 1fr auto;
      gap:18px;
      align-items:center;
      padding:18px;
      border-radius:20px;
    }
    .article-link:hover{
      background:#fff7ec;
      transform:translateX(3px);
    }
    .article-date{
      color:var(--brand);
      font-weight:900;
      font-size:.88rem;
    }
    .article-title{
      font-weight:920;
      margin:0 0 4px;
      letter-spacing:-.02em;
    }
    .article-desc{
      margin:0;
      color:var(--muted);
      font-size:.92rem;
    }
    .arrow{
      color:var(--subtle);
      font-size:1.4rem;
    }
    .recommend{
      padding:26px;
      background:#fff;
    }
    .recommend-list{
      display:grid;
      gap:12px;
      margin-top:18px;
    }
    .recommend-item{
      padding:16px;
      border:1px solid var(--line);
      border-radius:18px;
      background:#fbf7ef;
    }
    .recommend-item b{display:block;margin-bottom:4px}
    .recommend-item span{font-size:.9rem;color:var(--muted)}
    .reviews-layout{
      display:grid;
      grid-template-columns:.78fr 1.22fr;
      gap:22px;
      margin-top:28px;
    }
    .score-card{
      padding:30px;
      background:linear-gradient(180deg,#fff,#fff7ec);
    }
    .score{
      font-size:4rem;
      line-height:1;
      font-weight:980;
      letter-spacing:-.07em;
      margin:12px 0 4px;
    }
    .stars{color:#d99435;letter-spacing:.08em}
    .review-list{
      display:grid;
      grid-template-columns:repeat(2,1fr);
      gap:14px;
    }
    .review-card{
      padding:22px;
    }
    .review-card p{color:#596273;margin:10px 0 0}
    .avatar-line{
      display:flex;
      align-items:center;
      gap:10px;
    }
    .avatar{
      width:38px;
      height:38px;
      border-radius:50%;
      background:linear-gradient(135deg,var(--brand-3),var(--brand));
      color:#fff;
      display:grid;
      place-items:center;
      font-weight:900;
    }
    .faq-wrap{
      display:grid;
      grid-template-columns:.82fr 1.18fr;
      gap:22px;
      align-items:start;
    }
    .accordion{
      display:grid;
      gap:12px;
    }
    .accordion-item{
      border:1px solid var(--line)!important;
      border-radius:20px!important;
      overflow:hidden;
      background:#fff;
      box-shadow:var(--shadow-sm);
    }
    .accordion-button{
      border:0;
      background:#fff!important;
      color:var(--ink)!important;
      box-shadow:none!important;
      font-weight:900;
      padding:20px 22px;
      letter-spacing:-.02em;
    }
    .accordion-button:not(.collapsed){
      background:#fff7ec!important;
    }
    .accordion-body{
      color:var(--muted);
      padding:0 22px 22px;
      font-size:.96rem;
    }
    .join-panel{
      border-radius:34px;
      padding:34px;
      background:
        linear-gradient(135deg,rgba(255,255,255,.94),rgba(255,246,232,.92));
      border:1px solid var(--line);
      box-shadow:var(--shadow);
      display:grid;
      grid-template-columns:1.06fr .94fr;
      gap:24px;
      align-items:center;
    }
    .join-form{
      background:#fff;
      border:1px solid var(--line);
      border-radius:26px;
      padding:24px;
    }
    .form-control,.form-select{
      border-radius:16px;
      border:1px solid var(--line);
      padding:.86rem 1rem;
      box-shadow:none!important;
    }
    .form-control:focus,.form-select:focus{
      border-color:#d79b58;
      box-shadow:0 0 0 .25rem rgba(200,121,50,.14)!important;
    }
    .privacy-note{
      color:var(--subtle);
      font-size:.84rem;
      margin-top:10px;
    }
    .site-footer{
      background:#101622;
      color:rgba(255,255,255,.72);
      padding:48px 0 24px;
      margin-top:30px;
    }
    .footer-grid{
      display:grid;
      grid-template-columns:1.2fr .8fr .8fr;
      gap:26px;
      padding-bottom:30px;
      border-bottom:1px solid rgba(255,255,255,.10);
    }
    .footer-brand{
      color:#fff;
      font-weight:950;
      font-size:1.18rem;
      letter-spacing:-.03em;
      margin-bottom:12px;
    }
    .footer-title{
      color:#fff;
      font-weight:900;
      margin-bottom:12px;
    }
    .footer-links{
      display:grid;
      gap:8px;
    }
    .footer-links a:hover{color:#f1c27d}
    .copyright{
      display:flex;
      justify-content:space-between;
      gap:16px;
      flex-wrap:wrap;
      padding-top:22px;
      font-size:.9rem;
      color:rgba(255,255,255,.55);
    }
    .floating-cta{
      position:fixed;
      left:50%;
      bottom:18px;
      transform:translateX(-50%);
      z-index:999;
      width:min(720px,calc(100% - 28px));
      border-radius:999px;
      background:rgba(18,24,38,.90);
      color:#fff;
      border:1px solid rgba(255,255,255,.12);
      box-shadow:0 18px 55px rgba(18,24,38,.28);
      backdrop-filter:blur(16px);
      padding:10px 12px 10px 20px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:12px;
    }
    .floating-cta span{
      color:rgba(255,255,255,.78);
      font-weight:750;
      font-size:.92rem;
    }
    @media (max-width: 1024px){
      .command-search{min-width:190px}
      .metric-bar{grid-template-columns:1fr 1fr}
      .pain-grid,.materials-layout,.leaderboard,.briefing,.info-layout,.reviews-layout,.faq-wrap,.join-panel{grid-template-columns:1fr}
      .commission-wrap{grid-template-columns:1fr 1fr}
      .footer-grid{grid-template-columns:1fr 1fr}
    }
    @media (max-width: 768px){
      :root{--nav-h:auto}
      .navbar-collapse{
        margin-top:14px;
        padding:14px;
        border:1px solid var(--line);
        border-radius:22px;
        background:rgba(255,255,255,.95);
        box-shadow:var(--shadow-sm);
      }
      .nav-pill{
        border-radius:18px;
        box-shadow:none;
        background:transparent;
        border:0;
        padding:0;
      }
      .navbar .nav-link{padding:.72rem .85rem!important}
      .command-search{width:100%;min-width:0;margin:10px 0}
      .hero-inner{padding:42px 0 36px}
      .hero-ribbon{min-height:360px}
      .hero-actions{align-items:stretch}
      .hero-actions .btn{width:100%;justify-content:center}
      .metric-bar,.commission-wrap,.tool-grid,.campaign-grid,.review-list{grid-template-columns:1fr}
      .metric-item{min-height:auto}
      .section{padding:56px 0}
      .section-tight{padding:42px 0}
      .solution-row{grid-template-columns:auto 1fr}
      .solution-row .badge-soft{grid-column:2}
      .article-link{grid-template-columns:1fr;gap:8px}
      .footer-grid{grid-template-columns:1fr}
      .floating-cta{border-radius:24px;align-items:flex-start;flex-direction:column}
      .floating-cta .btn{width:100%}
    }
    @media (max-width: 520px){
      h1{font-size:2.42rem}
      .section-title{font-size:2.05rem}
      .hero-lead,.section-desc{font-size:.98rem}
      .pain-panel,.material-board,.invite-card,.brief-list,.join-panel{padding:22px}
      .campaign{padding:24px}
      .metric-bar{padding:12px;border-radius:22px}
      .metric-item{padding:16px;border-radius:18px}
      .rank-row{grid-template-columns:34px 1fr}
      .rank-score{grid-column:2}
      .copyright{padding-bottom:86px}
    }

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}