/* Mobile-first unique layout / extreme card geometry */
    :root{
      --bg:#071423;
      --card:#071825;
      --muted:#9fb0bd;
      --accent:#6fb8ff;
      --good:#22c55e;
      --bad:#ef4444;
      --glass: rgba(255,255,255,0.02);
      --border: rgba(255,255,255,0.04);
      --radius:14px;
      color: #e6f0fa;
      font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    }
    html,body{height:100%;margin:0;background:
      radial-gradient(800px 400px at 10% 10%, rgba(111,184,255,0.03), transparent 8%),
      radial-gradient(700px 300px at 90% 90%, rgba(34,197,94,0.02), transparent 8%),
      linear-gradient(180deg,var(--bg), #031024 80%);
      -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;}

    .app{max-width:1200px;margin:18px auto;padding:12px;}

    header{
      display:flex;gap:12px;align-items:center;margin-bottom:12px;
      transform: skewY(-1.5deg);
    }
    header h1{margin:0;font-size:15px;letter-spacing:0.3px}
    header .meta{margin-left:auto;font-size:12px;color:var(--muted)}

    .controls{
      background:linear-gradient(180deg, rgba(255,255,255,0.01), transparent);
      border-radius: calc(var(--radius) + 2px);
      padding:12px;border:1px solid var(--border);
      display:grid;grid-template-columns:1fr;gap:10px;
      box-shadow: 0 8px 30px rgba(2,6,23,0.55);
    }

    .inputs{display:flex;flex-direction:column;gap:8px;}
    .fields-row{display:flex;gap:8px;flex-direction:column;}
    label{font-size:12px;color:var(--muted);margin-bottom:6px}
    input[type="text"]{
      background:var(--glass);border:1px solid var(--border);
      padding:10px;border-radius:10px;color:var(--accent);outline:none;
    }
    select{background:var(--glass);border:1px solid var(--border);padding:10px;border-radius:10px;color:var(--accent)}
    .actions{display:flex;gap:8px;align-items:center;justify-content:flex-end}
    button{background:linear-gradient(180deg,var(--accent),#4f9cf3);color:#001428;border:none;padding:9px 12px;border-radius:10px;cursor:pointer;font-weight:700}
    .btn-ghost{background:transparent;border:1px solid var(--border);color:var(--muted);padding:9px;border-radius:10px}

    .error{color:var(--bad);font-size:13px;margin-top:6px;display:none}

    /* Main area — mobile stack first */
    .main{display:flex;flex-direction:column;gap:12px;margin-top:12px}
    .panels{display:flex;flex-direction:column;gap:12px}
    .panel{
      background:linear-gradient(180deg, rgba(255,255,255,0.01), transparent);
      border-radius:12px;border:1px solid var(--border);padding:12px;
    }

    /* Tabs */
    .tabs{display:flex;gap:8px;overflow:auto;margin-bottom:8px}
    .tab{padding:8px 10px;border-radius:10px;background:transparent;border:1px solid transparent;color:var(--muted);cursor:pointer}
    .tab.active{background:linear-gradient(180deg,#0b2a44,#071b2f);color:var(--accent);border:1px solid rgba(111,184,255,0.14)}

    /* Device controls */
    .device-toggle{display:flex;gap:8px;flex-wrap:wrap}
    .device-btn{padding:8px;border-radius:10px;border:1px solid var(--border);background:transparent;color:var(--muted);cursor:pointer}
    .device-btn.active{background:rgba(111,184,255,0.1);color:var(--accent);border:1px solid rgba(111,184,255,0.18)}

    /* Iframe area */
    .iframe-area{display:flex;flex-direction:column;gap:12px}
    .iframe-row{display:flex;gap:12px;flex-direction:column}
    .iframe-card{
      background:linear-gradient(180deg, rgba(255,255,255,0.01), transparent);
      border-radius:12px;padding:10px;border:1px solid var(--border);overflow:hidden;
    }
    .iframe-title{font-size:13px;color:var(--muted);margin-bottom:8px}
    .preview-frame{width:200%;border:0;border-radius:8px;background:white;height:700px}

    /* Source */
    pre.code{max-height:380px;max-width: 650px; border-radius:10px; padding:12px;background:#041019;border:1px solid var(--border)}
    .code-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;color:var(--muted)}

    /* SEO area */
    .seo-grid{display:grid;grid-template-columns:1fr;gap:12px}
    .seo-summary{display:flex;gap:12px;align-items:center}
    .score-bubble{width:88px;height:88px;border-radius:999px;background:linear-gradient(180deg,#071e19,#042219);display:flex;align-items:center;justify-content:center;flex-direction:column;border:1px solid rgba(255,255,255,0.03)}
    .score-big{font-size:20px;color:var(--accent);font-weight:700}
    .seo-list{margin-top:10px}
    .seo-item{display:flex;gap:10px;align-items:flex-start;padding:8px;border-radius:8px;border:1px solid rgba(255,255,255,0.02);margin-bottom:8px}
    .note{color:var(--muted);font-size:13px;margin-top:6px}

    /* Details & aside */
    .aside{display:flex;flex-direction:column;gap:12px}
    .details{color:var(--muted);font-size:13px}

    /* Compare view */
    .compare{display:grid;grid-template-columns:1fr;gap:12px}

    footer{color:var(--muted);font-size:12px;margin-top:12px}

    footer p {
        display: inline-block;
    }

    /* Tablet and desktop */
    @media (min-width:700px){
      .controls{grid-template-columns:1fr auto}
      .fields-row{flex-direction:row}
      .main{flex-direction:row}
      .panels{flex:1}
      .aside{width:360px}
      .compare{grid-template-columns:1fr 1fr}
      .iframe-row{flex-direction:row}
      .preview-frame{height:667px}
    }
    @media (min-width:1100px){
      .preview-frame{height:768px}
    }