:root{
      --primary:#0B3D91;
      --primary-dark:#072c69;
      --primary-soft:#eaf2ff;
      --cyan:#0891B2;
      --cyan-soft:#ecfeff;
      --ink:#172033;
      --muted:#667085;
      --line:#e4e7ec;
      --surface:#ffffff;
      --soft:#f6f8fb;
      --dark:#101828;
      --radius:18px;
      --shadow:0 16px 40px rgba(16,24,40,.09);
    }

    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      color:var(--ink);
      background:var(--surface);
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;
      line-height:1.7;
    }
    body.drawer-locked{overflow:hidden}
    img{display:block;max-width:100%}
    a{color:inherit;text-decoration:none}
    button,input,textarea,select{font:inherit}
    button{cursor:pointer}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}

    .topbar{
      color:#dce8ff;
      background:#071b3e;
      font-size:13px;
    }
    .topbar-inner{
      min-height:38px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:20px;
    }
    .topbar-contact{display:flex;align-items:center;gap:20px}
    .topbar a{transition:color .2s ease}
    .topbar a:hover{color:#fff}

    .header{
      position:relative;
      z-index:60;
      border-bottom:1px solid var(--line);
      background:rgba(255,255,255,.98);
      box-shadow:0 4px 18px rgba(16,24,40,.04);
    }
    .header-inner{
      min-height:78px;
      display:flex;
      align-items:center;
      gap:28px;
    }
    .logo{
      min-width:0;
      display:inline-flex;
      align-items:center;
      gap:11px;
      font-weight:800;
      color:var(--primary);
    }
    .logo img{
      width:42px;
      height:42px;
      object-fit:contain;
      border-radius:10px;
    }
    .logo span{
      max-width:180px;
      overflow:hidden;
      text-overflow:ellipsis;
      white-space:nowrap;
    }

    .main-nav{margin-left:auto}
    .nav-list{
      display:flex;
      align-items:stretch;
      gap:2px;
      margin:0;
      padding:0;
      list-style:none;
    }
    .nav-item{position:relative;display:flex;align-items:center}
    .nav-link{
      display:flex;
      align-items:center;
      min-height:78px;
      padding:0 12px;
      color:#344054;
      font-size:14px;
      font-weight:700;
      white-space:nowrap;
      transition:color .2s ease,background .2s ease;
    }
    .nav-link:hover,.nav-link.active{
      color:var(--primary);
      background:var(--primary-soft);
    }
    .has-panel>.nav-link::after{
      content:"";
      width:6px;
      height:6px;
      margin:0 0 4px 7px;
      border-right:1.5px solid currentColor;
      border-bottom:1.5px solid currentColor;
      transform:rotate(45deg);
    }
    .has-panel::after{
      content:"";
      position:absolute;
      top:100%;
      left:0;
      width:100%;
      height:14px;
    }

    .dropdown-panel,.mega-menu{
      position:absolute;
      top:100%;
      z-index:80;
      visibility:hidden;
      opacity:0;
      border:1px solid var(--line);
      border-radius:0 0 18px 18px;
      background:#fff;
      box-shadow:0 24px 60px rgba(16,24,40,.16);
      transform:translateY(8px);
      transition:opacity .2s ease,transform .2s ease,visibility .2s ease;
      pointer-events:none;
    }
    .nav-item:hover>.dropdown-panel,
    .nav-item:focus-within>.dropdown-panel,
    .nav-item:hover>.mega-menu,
    .nav-item:focus-within>.mega-menu{
      visibility:visible;
      opacity:1;
      transform:translateY(0);
      pointer-events:auto;
    }
    .dropdown-panel{
      left:0;
      width:330px;
      padding:22px;
    }
    .dropdown-title{
      margin:0 0 12px;
      color:var(--primary);
      font-size:12px;
      font-weight:800;
      letter-spacing:.08em;
    }
    .dropdown-list{display:grid;gap:6px}
    .dropdown-article{
      padding:10px 0;
      border-bottom:1px solid var(--line);
      color:#344054;
      font-size:14px;
      font-weight:650;
    }
    .dropdown-article:hover{color:var(--primary)}
    .panel-more{
      display:inline-flex;
      margin-top:14px;
      color:var(--primary);
      font-size:13px;
      font-weight:800;
    }

    .mega-menu{
      left:50%;
      width:min(930px,calc(100vw - 40px));
      padding:24px;
      transform:translate(-50%,8px);
    }
    .nav-item:hover>.mega-menu,
    .nav-item:focus-within>.mega-menu{transform:translate(-50%,0)}
    .nav-item:nth-last-child(-n+3) .mega-menu{
      right:-100px;
      left:auto;
      transform:translateY(8px);
    }
    .nav-item:nth-last-child(-n+3):hover>.mega-menu,
    .nav-item:nth-last-child(-n+3):focus-within>.mega-menu{
      transform:translateY(0);
    }
    .mega-head{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:24px;
      padding-bottom:16px;
      border-bottom:1px solid var(--line);
    }
    .mega-head strong{font-size:19px}
    .mega-kicker{
      margin:0 0 3px;
      color:var(--cyan);
      font-size:11px;
      font-weight:900;
      letter-spacing:.12em;
    }
    .mega-categories{
      display:flex;
      flex-wrap:wrap;
      gap:8px;
      padding:14px 0 4px;
    }
    .mega-categories a{
      padding:6px 10px;
      color:var(--primary);
      background:var(--primary-soft);
      border-radius:999px;
      font-size:12px;
      font-weight:700;
    }
    .mega-grid{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:12px;
      margin-top:16px;
    }
    .mega-card{
      min-width:0;
      display:flex;
      gap:12px;
      padding:12px;
      border:1px solid var(--line);
      border-radius:13px;
      background:#fff;
      transition:border-color .2s ease,transform .2s ease,box-shadow .2s ease;
    }
    .mega-card:hover{
      border-color:#b6c9ea;
      box-shadow:0 10px 24px rgba(11,61,145,.1);
      transform:translateY(-2px);
    }
    .mega-card>img{
      width:58px;
      height:58px;
      flex:0 0 58px;
      object-fit:cover;
      border-radius:10px;
      background:var(--soft);
    }
    .video-mega-card>img{width:88px;flex-basis:88px}
    .tool-mega-card>img{object-fit:contain;padding:8px}
    .mega-card-body{min-width:0;display:block}
    .mega-card-title{
      display:block;
      overflow:hidden;
      color:#1d2939;
      font-size:14px;
      font-weight:800;
      text-overflow:ellipsis;
      white-space:nowrap;
    }
    .mega-meta{
      display:flex;
      flex-wrap:wrap;
      gap:3px 8px;
      margin-top:5px;
      color:var(--muted);
      font-size:11px;
    }
    .mega-card p{
      display:-webkit-box;
      margin:5px 0 0;
      overflow:hidden;
      color:var(--muted);
      font-size:11px;
      line-height:1.5;
      -webkit-box-orient:vertical;
      -webkit-line-clamp:2;
    }

    .header-btns{
      display:flex;
      align-items:center;
      gap:9px;
      white-space:nowrap;
    }
    .header-btns>a{
      padding:9px 13px;
      color:#fff;
      background:var(--primary);
      border-radius:9px;
      font-size:13px;
      font-weight:800;
    }
    .header-btns>a:hover{background:var(--primary-dark)}
    .hamburger{
      width:43px;
      height:43px;
      display:none;
      align-items:center;
      justify-content:center;
      flex-direction:column;
      gap:5px;
      padding:0;
      border:1px solid var(--line);
      border-radius:10px;
      background:#fff;
    }
    .hamburger span{
      width:20px;
      height:2px;
      background:var(--ink);
      transition:transform .2s ease,opacity .2s ease;
    }
    .hamburger.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

    .drawer-overlay{
      position:fixed;
      inset:0;
      z-index:90;
      visibility:hidden;
      opacity:0;
      background:rgba(7,18,40,.58);
      transition:opacity .25s ease,visibility .25s ease;
    }
    .drawer-overlay.open{visibility:visible;opacity:1}
    .mobile-drawer{
      position:fixed;
      top:0;
      right:0;
      bottom:0;
      z-index:100;
      width:min(390px,92vw);
      overflow-y:auto;
      background:#fff;
      box-shadow:-18px 0 50px rgba(16,24,40,.22);
      transform:translateX(105%);
      transition:transform .28s ease;
    }
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{
      min-height:74px;
      display:flex;
      align-items:center;
      gap:10px;
      padding:14px 18px;
      border-bottom:1px solid var(--line);
    }
    .drawer-head>a{
      padding:8px 11px;
      color:#fff;
      background:var(--primary);
      border-radius:8px;
      font-size:13px;
      font-weight:800;
    }
    .drawer-close{
      width:38px;
      height:38px;
      margin-left:auto;
      padding:0;
      border:1px solid var(--line);
      border-radius:9px;
      color:var(--ink);
      background:#fff;
      font-size:26px;
      line-height:1;
    }
    .drawer-menu{padding:10px 18px 28px}
    .drawer-link,.drawer-toggle{
      width:100%;
      display:flex;
      align-items:center;
      justify-content:space-between;
      padding:14px 4px;
      border:0;
      border-bottom:1px solid var(--line);
      color:#1d2939;
      background:transparent;
      font-weight:750;
      text-align:left;
    }
    .drawer-toggle::after{
      content:"+";
      color:var(--primary);
      font-size:20px;
      font-weight:500;
    }
    .drawer-toggle.active::after{content:"−"}
    .drawer-submenu{
      display:none;
      padding:6px 0 10px 14px;
      border-bottom:1px solid var(--line);
    }
    .drawer-submenu.open{display:grid}
    .drawer-submenu a{
      padding:9px 5px;
      color:var(--muted);
      font-size:14px;
    }
    .drawer-submenu a:hover{color:var(--primary)}

    .video-detail-main{
      min-width:0;
      padding-bottom:88px;
      background:linear-gradient(180deg,#f5f9ff 0,#fff 450px);
    }
    .video-detail-main .video-hero{
      padding:42px 0 30px;
      border-bottom:1px solid #dce6f4;
    }
    .video-detail-main .breadcrumbs{
      display:flex;
      flex-wrap:wrap;
      align-items:center;
      gap:7px;
      margin-bottom:20px;
      color:var(--muted);
      font-size:13px;
    }
    .video-detail-main .breadcrumbs a:hover{color:var(--primary)}
    .video-detail-main .breadcrumbs span[aria-hidden="true"]{color:#98a2b3}
    .video-detail-main .video-label{
      display:inline-flex;
      align-items:center;
      gap:8px;
      margin-bottom:12px;
      color:var(--cyan);
      font-size:12px;
      font-weight:900;
      letter-spacing:.09em;
    }
    .video-detail-main .video-label::before{
      content:"";
      width:9px;
      height:9px;
      border-radius:50%;
      background:var(--cyan);
      box-shadow:0 0 0 5px rgba(8,145,178,.12);
    }
    .video-detail-main h1{
      max-width:960px;
      margin:0;
      color:#0f1d35;
      font-size:clamp(30px,4.2vw,52px);
      line-height:1.22;
      letter-spacing:-.035em;
      overflow-wrap:anywhere;
    }
    .video-detail-main .video-meta{
      display:flex;
      flex-wrap:wrap;
      gap:10px 22px;
      margin-top:20px;
      color:var(--muted);
      font-size:14px;
    }
    .video-detail-main .video-meta span{
      display:inline-flex;
      align-items:center;
      gap:7px;
    }
    .video-detail-main .video-meta span::before{
      content:"";
      width:6px;
      height:6px;
      border-radius:50%;
      background:#9bb7df;
    }

    .video-detail-main .watch-section{padding:36px 0 0}
    .video-detail-main .player-shell{
      position:relative;
      overflow:hidden;
      width:100%;
      min-height:420px;
      aspect-ratio:16/9;
      border:1px solid #1d2b42;
      border-radius:22px;
      background:#070d18;
      box-shadow:0 28px 65px rgba(7,18,40,.25);
    }
    .video-detail-main .player-shell>iframe,
    .video-detail-main .player-shell>video,
    .video-detail-main .player-shell>embed,
    .video-detail-main .player-shell>object{
      width:100%!important;
      height:100%!important;
      display:block;
      border:0;
    }
    .video-detail-main .player-shell img{width:100%;height:100%;object-fit:cover}
    .video-detail-main .player-shell>*{max-width:100%}
    .video-detail-main .player-address{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:20px;
      margin-top:14px;
      padding:13px 16px;
      border:1px solid var(--line);
      border-radius:12px;
      color:var(--muted);
      background:#fff;
      font-size:12px;
      overflow-wrap:anywhere;
    }
    .video-detail-main .player-address strong{color:#344054}

    .video-detail-main .content-grid{
      min-width:0;
      display:grid;
      grid-template-columns:minmax(0,1fr) 310px;
      gap:30px;
      padding-top:38px;
    }
    .video-detail-main .video-article,
    .video-detail-main .side-panel{
      min-width:0;
      border:1px solid var(--line);
      border-radius:var(--radius);
      background:#fff;
      box-shadow:0 10px 28px rgba(16,24,40,.05);
    }
    .video-detail-main .video-article{padding:clamp(22px,4vw,42px)}
    .video-detail-main .section-heading{
      margin:0 0 16px;
      color:#14213a;
      font-size:23px;
      line-height:1.35;
    }
    .video-detail-main .video-summary{
      margin:0;
      padding:20px 22px;
      border-left:4px solid var(--cyan);
      border-radius:0 12px 12px 0;
      color:#344054;
      background:var(--cyan-soft);
      font-size:16px;
    }
    .video-detail-main .video-body{
      min-width:0;
      max-width:100%;
      margin-top:30px;
      overflow-x:auto;
      color:#344054;
      font-size:16px;
    }
    .video-detail-main .video-body h2,
    .video-detail-main .video-body h3{
      margin:1.7em 0 .65em;
      color:#15233c;
      line-height:1.4;
    }
    .video-detail-main .video-body p{margin:0 0 1.2em}
    .video-detail-main .video-body img,
    .video-detail-main .video-body video,
    .video-detail-main .video-body iframe,
    .video-detail-main .video-body table{
      max-width:100%;
    }
    .video-detail-main .video-body iframe{border:0}
    .video-detail-main .video-body table{
      width:100%;
      border-collapse:collapse;
    }
    .video-detail-main .video-body th,
    .video-detail-main .video-body td{
      padding:10px;
      border:1px solid var(--line);
    }
    .video-detail-main .tag-row{
      display:flex;
      flex-wrap:wrap;
      align-items:center;
      gap:9px;
      margin-top:30px;
      padding-top:22px;
      border-top:1px solid var(--line);
    }
    .video-detail-main .tag-row strong{
      margin-right:4px;
      color:#344054;
      font-size:13px;
    }
    .video-detail-main .tag-value{
      color:var(--primary);
      font-size:14px;
      font-weight:700;
      overflow-wrap:anywhere;
    }

    .video-detail-main .sidebar{display:grid;align-content:start;gap:18px}
    .video-detail-main .side-panel{padding:22px}
    .video-detail-main .side-panel h2{
      margin:0 0 12px;
      color:#172033;
      font-size:18px;
    }
    .video-detail-main .side-panel p{
      margin:0;
      color:var(--muted);
      font-size:14px;
    }
    .video-detail-main .side-stat{
      display:grid;
      grid-template-columns:1fr auto;
      gap:10px;
      padding:11px 0;
      border-bottom:1px solid var(--line);
      color:var(--muted);
      font-size:13px;
    }
    .video-detail-main .side-stat:last-child{border-bottom:0}
    .video-detail-main .side-stat strong{
      color:#1d2939;
      font-weight:800;
      text-align:right;
      overflow-wrap:anywhere;
    }
    .video-detail-main .category-button{
      display:flex;
      align-items:center;
      justify-content:center;
      margin-top:18px;
      padding:11px 14px;
      border-radius:10px;
      color:#fff;
      background:var(--primary);
      font-size:14px;
      font-weight:800;
    }
    .video-detail-main .category-button:hover{background:var(--primary-dark)}
    .video-detail-main .notice-panel{
      border-color:#bde8ef;
      background:linear-gradient(145deg,#ecfeff,#f7fbff);
    }

    .video-detail-main .related-section{padding-top:62px}
    .video-detail-main .section-head{
      display:flex;
      align-items:end;
      justify-content:space-between;
      gap:24px;
      margin-bottom:22px;
    }
    .video-detail-main .section-head p{
      margin:4px 0 0;
      color:var(--muted);
      font-size:14px;
    }
    .video-detail-main .section-head h2{
      margin:0;
      color:#14213a;
      font-size:30px;
    }
    .video-detail-main .more-link{
      flex:0 0 auto;
      color:var(--primary);
      font-size:14px;
      font-weight:850;
    }
    .video-detail-main .related-grid{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:20px;
    }
    .video-detail-main .related-card{
      min-width:0;
      overflow:hidden;
      border:1px solid var(--line);
      border-radius:16px;
      background:#fff;
      box-shadow:0 10px 28px rgba(16,24,40,.06);
      transition:transform .2s ease,box-shadow .2s ease;
    }
    .video-detail-main .related-card:hover{
      transform:translateY(-4px);
      box-shadow:0 18px 38px rgba(11,61,145,.12);
    }
    .video-detail-main .related-cover{
      position:relative;
      overflow:hidden;
      aspect-ratio:16/9;
      background:#dbe7f6;
    }
    .video-detail-main .related-cover img{
      width:100%;
      height:100%;
      object-fit:cover;
      transition:transform .3s ease;
    }
    .video-detail-main .related-card:hover .related-cover img{transform:scale(1.04)}
    .video-detail-main .play-mark{
      position:absolute;
      left:16px;
      bottom:14px;
      width:40px;
      height:40px;
      display:grid;
      place-items:center;
      border:1px solid rgba(255,255,255,.65);
      border-radius:50%;
      color:#fff;
      background:rgba(11,61,145,.88);
      box-shadow:0 8px 20px rgba(0,0,0,.2);
    }
    .video-detail-main .play-mark::before{
      content:"";
      margin-left:3px;
      border-top:6px solid transparent;
      border-bottom:6px solid transparent;
      border-left:9px solid #fff;
    }
    .video-detail-main .duration{
      position:absolute;
      right:11px;
      bottom:11px;
      padding:3px 7px;
      border-radius:6px;
      color:#fff;
      background:rgba(7,13,24,.82);
      font-size:11px;
      font-weight:800;
    }
    .video-detail-main .related-body{padding:17px}
    .video-detail-main .related-body h3{
      display:-webkit-box;
      margin:0;
      overflow:hidden;
      color:#1d2939;
      font-size:16px;
      line-height:1.55;
      -webkit-box-orient:vertical;
      -webkit-line-clamp:2;
    }
    .video-detail-main .related-body p{
      display:-webkit-box;
      margin:8px 0 0;
      overflow:hidden;
      color:var(--muted);
      font-size:13px;
      line-height:1.65;
      -webkit-box-orient:vertical;
      -webkit-line-clamp:2;
    }

    .footer{color:#c7d2e5;background:#0a1730}
    .footer-main{padding:60px 0 44px}
    .footer-grid{
      display:grid;
      grid-template-columns:1.35fr 1fr 1fr 1fr;
      gap:44px;
    }
    .footer .logo{color:#fff}
    .footer-brand p{
      max-width:380px;
      margin:18px 0 0;
      color:#aebbd1;
      font-size:14px;
    }
    .footer h2{
      margin:0 0 16px;
      color:#fff;
      font-size:15px;
    }
    .footer-links,.footer-contact{display:grid;gap:9px}
    .footer-links a,.footer-contact a{
      color:#b8c4d8;
      font-size:14px;
      transition:color .2s ease,transform .2s ease;
    }
    .footer-links a:hover,.footer-contact a:hover{color:#fff;transform:translateX(2px)}
    .footer-social{margin-top:7px}
    .footer-bottom{border-top:1px solid rgba(255,255,255,.1)}
    .footer-bottom-inner{
      min-height:66px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:20px;
      color:#98a7bf;
      font-size:12px;
    }

    @media (max-width:1100px){
      .main-nav{display:none}
      .hamburger{display:flex}
      .header-btns{margin-left:auto}
      .video-detail-main .content-grid{grid-template-columns:minmax(0,1fr) 280px}
      .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    }

    @media (max-width:800px){
      .container{width:min(100% - 28px,1180px)}
      .topbar-inner{padding:8px 0}
      .topbar-contact{gap:10px}
      .video-detail-main .content-grid{grid-template-columns:1fr}
      .video-detail-main .sidebar{grid-template-columns:repeat(2,minmax(0,1fr))}
      .video-detail-main .related-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
      .video-detail-main .player-shell{min-height:0;border-radius:14px}
      .footer-grid{gap:34px}
    }

    @media (max-width:600px){
      .topbar-welcome{display:none}
      .topbar-inner{justify-content:center}
      .topbar-contact{width:100%;justify-content:space-between}
      .header-inner{min-height:68px;gap:12px}
      .logo img{width:36px;height:36px}
      .logo span{max-width:120px}
      .header-btns>a{display:none}
      .hamburger{width:40px;height:40px}
      .video-detail-main .video-hero{padding:30px 0 23px}
      .video-detail-main h1{font-size:30px}
      .video-detail-main .watch-section{padding-top:24px}
      .video-detail-main .player-address{
        align-items:flex-start;
        flex-direction:column;
        gap:4px;
      }
      .video-detail-main .video-article{padding:22px 18px}
      .video-detail-main .video-summary{padding:16px}
      .video-detail-main .sidebar{grid-template-columns:1fr}
      .video-detail-main .related-section{padding-top:44px}
      .video-detail-main .section-head{align-items:flex-start;flex-direction:column}
      .video-detail-main .section-head h2{font-size:25px}
      .video-detail-main .related-grid{grid-template-columns:1fr}
      .footer-main{padding:44px 0 34px}
      .footer-grid{grid-template-columns:1fr;gap:30px}
      .footer-bottom-inner{
        align-items:flex-start;
        flex-direction:column;
        justify-content:center;
        padding:16px 0;
      }
    }