/* roulang page: index */
:root{
  --bgb:#f5f8fd;
  --cd:#ffffff;
  --t1:#0f1c33;
  --t2:#5d6b85;
  --bd:#e2e9f5;
  --ac:#1652b8;
  --ac2:#ff5b3c;
  --rd:14px;
  --sh:0 10px 30px rgba(22,82,184,.08);
  --sp:clamp(44px,6vw,82px);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;background:var(--bgb);color:var(--t1);font-size:16px;line-height:1.7}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
button,input{font:inherit}
.bmdn-wrap{width:min(1200px,calc(100% - 40px));margin:0 auto}

/* 顶栏 */
.bmdn-top{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--bd)}
.bmdn-top-in{display:flex;align-items:center;gap:20px;height:68px}
.bmdn-logo{display:flex;align-items:center;gap:10px;flex:none}
.bmdn-logo-m{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--ac),#3d8bff);color:#fff;display:grid;place-items:center;font-size:17px;font-weight:700}
.bmdn-logo-t{font-size:17px;font-weight:700;letter-spacing:.4px}
.bmdn-nav{display:flex;gap:4px;margin-left:auto;overflow-x:auto;scrollbar-width:none}
.bmdn-nav::-webkit-scrollbar{display:none}
.bmdn-nav a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:9px;font-size:15px;color:var(--t2);white-space:nowrap;transition:background .2s,color .2s}
.bmdn-nav a:hover,.bmdn-nav a:focus-visible{background:#eef3fd;color:var(--ac)}
.bmdn-topbtn{flex:none;display:flex;align-items:center;min-height:44px;padding:0 20px;border-radius:10px;background:var(--ac);color:#fff;font-size:15px;font-weight:600;transition:background .2s}
.bmdn-topbtn:hover{background:#0f3f92}

/* 首屏 */
.bmdn-hero{background:linear-gradient(180deg,#eaf2ff 0%,var(--bgb) 100%);padding:52px 0 var(--sp);border-bottom:1px solid var(--bd)}
.bmdn-hero-in{display:grid;grid-template-columns:1fr;gap:34px}
.bmdn-badge{display:inline-block;padding:6px 14px;border-radius:999px;background:#fff;border:1px solid #cfe0ff;color:var(--ac);font-size:13px;font-weight:600}
.bmdn-hero h1{font-size:clamp(30px,4.4vw,50px);line-height:1.18;letter-spacing:-1px;margin:16px 0 12px}
.bmdn-hero h1 em{font-style:normal;color:var(--ac2)}
.bmdn-hero-sub{font-size:clamp(16px,1.6vw,19px);font-weight:600;color:#1d2f52}
.bmdn-hero-desc{margin-top:14px;color:var(--t2);font-size:15px;max-width:60ch}
.bmdn-hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.bmdn-hero-tags li{padding:6px 14px;border-radius:8px;background:#fff;border:1px solid var(--bd);font-size:14px;color:#2b3f66}
.bmdn-hero-act{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px}
.bmdn-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 28px;border-radius:12px;background:var(--ac);color:#fff;font-weight:600;box-shadow:0 12px 24px rgba(22,82,184,.22);transition:transform .22s,box-shadow .22s,background .22s}
.bmdn-btn:hover{transform:translateY(-2px);box-shadow:0 16px 30px rgba(22,82,184,.28)}
.bmdn-btn-ghost{background:#fff;color:var(--ac);border:1px solid #c9dbff;box-shadow:none}
.bmdn-btn-ghost:hover{background:#f2f7ff;transform:translateY(-2px)}
.bmdn-hero-note{margin-top:16px;font-size:13.5px;color:#7b89a3}
.bmdn-hero-pic img{width:100%;height:100%;aspect-ratio:4/3;object-fit:cover;border-radius:calc(var(--rd) + 8px);box-shadow:0 24px 50px rgba(15,40,90,.18)}

/* 板块骨架 */
.bmdn-sec{padding:var(--sp) 0}
.bmdn-alt{background:var(--cd);border-top:1px solid var(--bd);border-bottom:1px solid var(--bd)}
.bmdn-head{max-width:780px;margin-bottom:30px}
.bmdn-head h2{font-size:clamp(22px,2.6vw,30px);letter-spacing:-.5px}
.bmdn-head p{margin-top:10px;color:var(--t2);font-size:15px}

/* 权益卡 */
.bmdn-perks{display:grid;grid-template-columns:1fr;gap:16px}
.bmdn-perks li{background:var(--cd);border:1px solid var(--bd);border-radius:var(--rd);padding:22px;box-shadow:var(--sh);transition:transform .22s,box-shadow .22s}
.bmdn-perks li:hover{transform:translateY(-3px);box-shadow:0 18px 34px rgba(22,82,184,.14)}
.bmdn-perks h3{display:flex;align-items:center;gap:10px;font-size:16px}
.bmdn-dot{width:9px;height:9px;border-radius:50%;background:var(--ac2);flex:none}
.bmdn-perks p{margin-top:8px;font-size:14px;color:var(--t2)}

/* 卡片墙 */
.bmdn-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.bmdn-card{background:var(--cd);border:1px solid var(--bd);border-radius:var(--rd);padding:10px;box-shadow:var(--sh);transition:transform .24s,box-shadow .24s}
.bmdn-card:hover{transform:translateY(-4px);box-shadow:0 18px 34px rgba(22,82,184,.15)}
.bmdn-thumb{position:relative;border-radius:10px;overflow:hidden;background:#dbe6f8;aspect-ratio:3/4}
.bmdn-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.bmdn-card:hover .bmdn-thumb img{transform:scale(1.04)}
.bmdn-tag{position:absolute;left:8px;top:8px;padding:3px 8px;border-radius:6px;background:rgba(10,26,56,.78);color:#fff;font-size:12px;line-height:1.5}
.bmdn-score{position:absolute;right:8px;bottom:8px;padding:3px 8px;border-radius:6px;background:var(--ac2);color:#fff;font-size:12px;font-weight:700;line-height:1.5}
.bmdn-card h3{margin-top:10px;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bmdn-card p{margin-top:4px;font-size:12.5px;color:var(--t2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* 分类频道 */
.bmdn-cats{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.bmdn-cats li{background:var(--cd);border:1px solid var(--bd);border-radius:var(--rd);padding:22px;box-shadow:var(--sh)}
.bmdn-cats h3{font-size:17px;display:flex;align-items:center;gap:8px}
.bmdn-cats h3::before{content:"";width:4px;height:16px;border-radius:2px;background:var(--ac)}
.bmdn-cats p{margin-top:9px;font-size:14px;color:var(--t2)}

/* 榜单 */
.bmdn-rank{display:grid;gap:10px}
.bmdn-rank li{display:flex;align-items:center;gap:14px;background:var(--cd);border:1px solid var(--bd);border-radius:12px;padding:12px 16px;min-height:58px}
.bmdn-rk{flex:none;width:28px;height:28px;border-radius:8px;background:#eef3fd;color:var(--ac);display:grid;place-items:center;font-weight:700;font-size:14px}
.bmdn-rank li:nth-child(-n+3) .bmdn-rk{background:var(--ac);color:#fff}
.bmdn-rk-n{flex:1;min-width:0}
.bmdn-rk-n h3{font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bmdn-rk-n p{font-size:12.5px;color:var(--t2)}
.bmdn-rk-s{flex:none;font-size:15px;font-weight:700;color:var(--ac2)}

/* 高分好评 */
.bmdn-good{display:grid;gap:16px}
.bmdn-good li{background:var(--cd);border:1px solid var(--bd);border-left:4px solid var(--ac);border-radius:12px;padding:18px 20px}
.bmdn-good h3{font-size:16px;display:flex;justify-content:space-between;gap:12px;align-items:baseline}
.bmdn-good h3 span{font-size:14px;color:var(--ac2);font-weight:700;flex:none}
.bmdn-good p{margin-top:8px;font-size:14px;color:var(--t2)}

/* 短剧三卡 */
.bmdn-grid3{display:grid;grid-template-columns:1fr;gap:20px}

/* 专题 */
.bmdn-spots{display:grid;grid-template-columns:1fr;gap:20px}
.bmdn-spots li{background:var(--cd);border:1px solid var(--bd);border-radius:var(--rd);overflow:hidden;box-shadow:var(--sh);transition:transform .24s,box-shadow .24s}
.bmdn-spots li:hover{transform:translateY(-4px);box-shadow:0 18px 34px rgba(22,82,184,.15)}
.bmdn-spots img{width:100%;height:180px;object-fit:cover}
.bmdn-spot-body{padding:18px 20px 22px}
.bmdn-spot-body h3{font-size:17px}
.bmdn-spot-body p{margin-top:8px;font-size:14px;color:var(--t2)}
.bmdn-spot-body span{display:inline-block;margin-top:12px;padding:4px 12px;border-radius:999px;background:#eef3fd;color:var(--ac);font-size:12.5px}

/* 类型 / 年代 */
.bmdn-types{display:grid;grid-template-columns:1fr;gap:18px}
.bmdn-types article{background:var(--cd);border:1px solid var(--bd);border-radius:var(--rd);padding:22px;box-shadow:var(--sh)}
.bmdn-types h3{font-size:17px}
.bmdn-chip{display:inline-block;margin:10px 6px 0 0;padding:5px 12px;border-radius:999px;background:#eef3fd;color:#2b3f66;font-size:13px}
.bmdn-years{display:grid;grid-template-columns:1fr;gap:16px}
.bmdn-years li{background:var(--cd);border-left:3px solid var(--bd);border-radius:0 12px 12px 0;padding:16px 22px}
.bmdn-years h3{font-size:15px;color:var(--ac);letter-spacing:.5px}
.bmdn-years p{margin-top:8px;font-size:14.5px;color:#33456b}

/* 资讯 */
.bmdn-news{border-top:1px solid var(--bd)}
.bmdn-news li{display:grid;grid-template-columns:1fr;gap:4px;padding:18px 0;border-bottom:1px solid var(--bd)}
.bmdn-news h3{font-size:16px}
.bmdn-news p{font-size:14px;color:var(--t2)}
.bmdn-when{font-size:13px;color:var(--ac);font-weight:600}

/* 问答 */
.bmdn-faq{display:grid;gap:12px;max-width:900px}
.bmdn-faq details{background:var(--cd);border:1px solid var(--bd);border-radius:12px;padding:0 20px}
.bmdn-faq summary{display:flex;justify-content:space-between;align-items:center;gap:12px;min-height:44px;padding:18px 0;cursor:pointer;font-weight:600;list-style:none}
.bmdn-faq summary::-webkit-details-marker{display:none}
.bmdn-faq summary::after{content:"+";color:var(--ac);font-size:20px;line-height:1;font-weight:400}
.bmdn-faq details[open] summary::after{content:"–"}
.bmdn-faq p{padding-bottom:18px;font-size:14.5px;color:var(--t2)}

/* 收口 */
.bmdn-cta{background:linear-gradient(120deg,#123a80,#1c5fc9);border-radius:calc(var(--rd) + 8px);padding:clamp(32px,5vw,58px);color:#fff;text-align:center;box-shadow:0 24px 48px rgba(18,58,128,.24)}
.bmdn-cta h2{font-size:clamp(22px,2.8vw,30px)}
.bmdn-cta p{margin:14px auto 0;max-width:62ch;font-size:15px;color:#d3e2ff}
.bmdn-cta .bmdn-btn{margin-top:26px;background:#fff;color:var(--ac);box-shadow:0 12px 26px rgba(0,0,0,.18)}

/* 页脚 */
.bmdn-foot{background:#0d1b33;color:#c3cee2;padding:56px 0 24px;margin-top:var(--sp)}
.bmdn-foot-grid{display:grid;grid-template-columns:1fr;gap:32px}
.bmdn-foot h4{color:#fff;font-size:15px;margin-bottom:12px}
.bmdn-foot li{padding:5px 0;font-size:14px}
.bmdn-foot a{transition:color .2s}
.bmdn-foot a:hover{color:#fff}
.bmdn-foot-brand p{margin-top:12px;font-size:14px;color:#93a3c0;max-width:34ch}
.bmdn-copy{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;margin-top:36px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);font-size:13px;color:#8b9ab6}

@media(min-width:768px){
  .bmdn-grid{grid-template-columns:repeat(3,1fr)}
  .bmdn-perks{grid-template-columns:repeat(2,1fr)}
  .bmdn-cats{grid-template-columns:repeat(3,1fr)}
  .bmdn-rank{grid-template-columns:1fr 1fr;gap:10px 26px}
  .bmdn-good{grid-template-columns:1fr 1fr}
  .bmdn-grid3{grid-template-columns:repeat(3,1fr)}
  .bmdn-spots{grid-template-columns:repeat(3,1fr)}
  .bmdn-types{grid-template-columns:repeat(3,1fr)}
  .bmdn-years{grid-template-columns:repeat(3,1fr)}
  .bmdn-news li{grid-template-columns:100px 1fr;gap:18px;align-items:baseline}
  .bmdn-foot-grid{grid-template-columns:2fr 1fr 1fr 1fr}
}
@media(min-width:1024px){
  .bmdn-hero-in{grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
  .bmdn-grid{grid-template-columns:repeat(6,1fr);gap:18px}
  .bmdn-perks{grid-template-columns:repeat(4,1fr)}
}
@media(max-width:768px){
  .bmdn-top-in{height:62px;gap:14px}
  .bmdn-logo-t{font-size:16px}
  .bmdn-nav a{font-size:14px;padding:8px 10px}
  .bmdn-hero{padding:38px 0 46px}
  .bmdn-hero-pic img{aspect-ratio:16/10}
}
@media(max-width:520px){
  .bmdn-wrap{width:calc(100% - 28px)}
  .bmdn-topbtn{display:none}
  .bmdn-logo-t{font-size:15px}
  .bmdn-hero-act{flex-direction:column}
  .bmdn-btn{width:100%}
  .bmdn-grid{gap:14px}
  .bmdn-card{padding:8px}
  .bmdn-card h3{font-size:14px}
  .bmdn-card p{font-size:12px}
  .bmdn-head p{font-size:14px}
  .bmdn-foot{padding:40px 0 20px}
}