:root{
      --bg:#070708;
      --panel:#101013;
      --panel-2:#15151a;
      --line:#26262d;
      --text:#f4f4f5;
      --muted:#9b9ba5;
      --soft:#cfcfd5;
      --accent:#f6f1ea;
      --shadow:0 24px 80px rgba(0,0,0,.38);
      --radius:22px;
    }

    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      min-height:100vh;
      background:
        radial-gradient(circle at 15% 0%, rgba(255,255,255,.055), transparent 28%),
        linear-gradient(180deg,#09090b 0%,#050506 100%);
      color:var(--text);
      font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
    }

    button,input{font:inherit}
    button{cursor:pointer}

    .app{
      width:min(1500px,calc(100% - 28px));
      margin:0 auto;
      padding:22px 0 34px;
    }

    .topbar{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:18px;
      margin-bottom:18px;
    }

    .brand{
      display:flex;
      align-items:center;
      gap:12px;
      min-width:0;
    }

    .logo{
      width:44px;
      height:44px;
      border-radius:14px;
      border:1px solid #2b2b31;
      display:grid;
      place-items:center;
      background:#f5f5f5;
      color:#050506;
      font-size:20px;
      font-weight:900;
      letter-spacing:-.04em;
      box-shadow:0 10px 32px rgba(255,255,255,.08);
    }

    .brand h1{
      margin:0;
      font-size:18px;
      letter-spacing:-.02em;
    }

    .brand p{
      margin:3px 0 0;
      color:var(--muted);
      font-size:12px;
    }

    .badge{
      border:1px solid var(--line);
      color:#d5d5da;
      background:#0d0d10;
      border-radius:999px;
      padding:9px 12px;
      font-size:12px;
      white-space:nowrap;
    }

    .hero{
      display:grid;
      grid-template-columns:minmax(0,1fr) 330px;
      gap:18px;
      align-items:stretch;
    }

    .main-card,.side-card,.stat-card,.info-card{
      border:1px solid var(--line);
      background:linear-gradient(180deg,rgba(18,18,22,.96),rgba(11,11,14,.96));
      box-shadow:var(--shadow);
      border-radius:var(--radius);
    }

    .main-card{
      padding:20px;
      min-width:0;
    }

    .section-title{
      display:flex;
      align-items:flex-start;
      justify-content:space-between;
      gap:16px;
      margin-bottom:16px;
    }

    .section-title h2{
      margin:0;
      font-size:22px;
      letter-spacing:-.025em;
    }

    .section-title p{
      margin:5px 0 0;
      color:var(--muted);
      font-size:13px;
      line-height:1.55;
    }

    .graph-shell{
      position:relative;
      height:520px;
      background:
        linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),
        linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px),
        #09090b;
      background-size:44px 44px;
      border:1px solid #222229;
      border-radius:18px;
      overflow:hidden;
    }

    canvas{
      width:100%;
      height:100%;
      display:block;
    }

    .graph-note{
      position:absolute;
      top:14px;
      left:14px;
      padding:8px 10px;
      border-radius:10px;
      background:rgba(6,6,8,.72);
      border:1px solid rgba(255,255,255,.08);
      backdrop-filter:blur(8px);
      color:#bebec6;
      font-size:11px;
      pointer-events:none;
    }


    .zoom-controls{
      position:absolute;
      top:14px;
      right:14px;
      display:flex;
      align-items:center;
      gap:7px;
      padding:6px;
      border:1px solid rgba(255,255,255,.08);
      border-radius:12px;
      background:rgba(6,6,8,.78);
      backdrop-filter:blur(8px);
    }

    .zoom-btn,.zoom-reset{
      border:1px solid #303038;
      background:#111115;
      color:#f4f4f5;
      border-radius:9px;
      height:34px;
      min-width:34px;
      padding:0 10px;
      font-weight:800;
      line-height:1;
    }

    .zoom-btn{font-size:20px;}
    .zoom-reset{font-size:11px;font-weight:700;}
    .zoom-btn:hover,.zoom-reset:hover{background:#1a1a20;}

    .legend{
      display:flex;
      flex-wrap:wrap;
      gap:12px;
      margin-top:13px;
      color:var(--muted);
      font-size:12px;
    }

    .legend-item{
      display:flex;
      align-items:center;
      gap:7px;
    }

    .dot{
      width:8px;
      height:8px;
      border-radius:50%;
      background:#fff;
    }

    .line-dot{
      width:18px;
      height:2px;
      background:#fff;
      border-radius:2px;
    }

    .side{
      display:grid;
      gap:18px;
    }

    .side-card{
      padding:19px;
    }

    .side-card h3{
      margin:0 0 4px;
      font-size:15px;
    }

    .side-card .sub{
      color:var(--muted);
      font-size:12px;
      margin-bottom:18px;
      line-height:1.5;
    }

    .temp-display{
      display:flex;
      align-items:flex-end;
      gap:7px;
      margin-bottom:15px;
    }

    .temp-display strong{
      font-size:44px;
      line-height:1;
      letter-spacing:-.05em;
    }

    .temp-display span{
      color:var(--muted);
      padding-bottom:5px;
    }

    .slider-wrap{
      margin:16px 0 8px;
    }

    input[type="range"]{
      width:100%;
      accent-color:#fff;
    }

    .range-labels{
      display:flex;
      justify-content:space-between;
      color:#777781;
      font-size:10px;
      margin-top:5px;
    }

    .preset-grid{
      display:grid;
      grid-template-columns:repeat(2,1fr);
      gap:8px;
      margin-top:15px;
    }

    .preset{
      border:1px solid #2b2b32;
      background:#111115;
      color:#e8e8ea;
      border-radius:12px;
      padding:10px 9px;
      font-size:12px;
      transition:.2s ease;
    }

    .preset:hover{
      background:#18181e;
      transform:translateY(-1px);
    }

    .preset.active{
      background:#f4f4f5;
      color:#09090b;
      border-color:#f4f4f5;
      font-weight:700;
    }

    .toggle-row{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:10px;
      padding:11px 0;
      border-bottom:1px solid #222228;
      color:#d0d0d5;
      font-size:12px;
    }

    .toggle-row:last-child{border-bottom:0;padding-bottom:0}

    .switch{
      position:relative;
      width:42px;
      height:23px;
      background:#26262c;
      border-radius:999px;
      border:1px solid #34343a;
      transition:.2s;
      flex:none;
    }

    .switch::after{
      content:"";
      position:absolute;
      width:17px;
      height:17px;
      top:2px;
      left:2px;
      border-radius:50%;
      background:#8b8b94;
      transition:.2s;
    }

    .switch.on{
      background:#f3f3f4;
      border-color:#f3f3f4;
    }

    .switch.on::after{
      left:21px;
      background:#0a0a0b;
    }

    .stats{
      margin-top:18px;
      display:grid;
      grid-template-columns:repeat(4,1fr);
      gap:14px;
    }

    .stat-card{
      padding:17px;
    }

    .stat-label{
      color:var(--muted);
      font-size:11px;
      text-transform:uppercase;
      letter-spacing:.08em;
      margin-bottom:8px;
    }

    .stat-value{
      font-size:21px;
      font-weight:800;
      letter-spacing:-.03em;
      overflow-wrap:anywhere;
    }

    .stat-desc{
      margin-top:6px;
      color:#777781;
      font-size:11px;
      line-height:1.45;
    }

    .bottom-grid{
      display:grid;
      grid-template-columns:1.2fr .8fr;
      gap:18px;
      margin-top:18px;
    }

    .info-card{
      padding:20px;
    }

    .info-card h3{
      margin:0 0 10px;
      font-size:16px;
    }

    .info-card p{
      margin:0;
      color:#a5a5ae;
      font-size:13px;
      line-height:1.7;
    }

    .formula{
      margin-top:14px;
      padding:13px 14px;
      border:1px solid #27272d;
      border-radius:13px;
      background:#0b0b0e;
      color:#e6e6e9;
      font-family:"SFMono-Regular",Consolas,monospace;
      font-size:12px;
      overflow:auto;
    }

    .spectrum-preview{
      height:76px;
      margin-top:14px;
      border-radius:14px;
      border:1px solid #24242a;
      position:relative;
      overflow:hidden;
      background:linear-gradient(90deg,#30104f 0%,#3723a8 14%,#155eea 27%,#00a6ff 36%,#00d87c 48%,#d8ee00 62%,#ffb100 75%,#ff4b18 87%,#651016 100%);
    }

    .preview-overlay{
      position:absolute;
      inset:0;
      background:linear-gradient(180deg,rgba(255,255,255,.1),rgba(0,0,0,.48));
    }

    .peak-marker{
      position:absolute;
      top:0;
      bottom:0;
      width:2px;
      background:#fff;
      box-shadow:0 0 13px #fff;
    }

    footer{
      text-align:center;
      color:#686872;
      font-size:11px;
      padding:24px 0 0;
    }

    @media (max-width:1050px){
      .hero{grid-template-columns:1fr}
      .side{grid-template-columns:1fr 1fr}
      .stats{grid-template-columns:repeat(2,1fr)}
      .graph-shell{height:470px}
    }

    @media (max-width:720px){
      .app{width:min(100% - 18px,1500px);padding-top:12px}
      .topbar{align-items:flex-start}
      .badge{display:none}
      .main-card,.side-card,.stat-card,.info-card{border-radius:18px}
      .main-card{padding:13px}
      .side{grid-template-columns:1fr}
      .stats{grid-template-columns:1fr 1fr;gap:9px}
      .bottom-grid{grid-template-columns:1fr}
      .graph-shell{height:400px}
      .section-title{display:block}
      .section-title h2{font-size:19px}
      .stat-value{font-size:17px}
    }

    @media (max-width:470px){
      .graph-shell{height:330px}
      .stats{grid-template-columns:1fr}
      .temp-display strong{font-size:39px}
    }