:root {
      --bg: #0f1220;
      --bg1: #0f1220;
      --panel: #15192e;
      --card: #1b2142;
      --text: #ffffff;
      --text2: #eef2ff;
      --muted: #a6b0d4;
      --accent: #7aa2ff;
      --accent-2: #22c55e;
      --danger: #ef4444;
      --divider: #293053;

    }
    * { box-sizing: border-box; }
    html, body { height: 100%; margin: 0; background: var(--bg); color: var(--text); font-family: system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif; }
    #app {
      display: grid;
      grid-template-columns: 360px 1fr;
      grid-template-rows: 100vh;
      overflow: hidden;
    }
    aside {
      background: var(--panel);
      border-right: 1px solid var(--divider);
      padding: 16px;
      overflow-y: auto;
    }
    .header {
      display: flex; align-items: center; justify-content: space-between;
      gap: 12px; margin-bottom: 12px;
    }
    .title { font-size: 18px; font-weight: 700; letter-spacing: .2px; }
    .subtle { color: var(--muted); font-size: 12px; }

    .btn {
      appearance: none; border: none; border-radius: 12px; padding: 10px 14px;
      background: var(--accent); color: #0b0f1f; font-weight: 700; cursor: pointer;
      transition: transform .05s ease, filter .2s ease;
    }
    .btn:active { transform: translateY(1px); }
    .btn.secondary { background: #2c3566; color: var(--text); }
    .btn.success   { background: var(--accent-2); color: #0b1a10; }
    .btn.danger    { background: var(--danger); color: #190c0c; }
    .btn.block { width: 100%; }
    .btn:disabled {
      background: #888;      /* gray background */
      color: #ccc;           /* light gray text */
      cursor: not-allowed;   /* change cursor to indicate disabled */
      filter: brightness(0.9); /* optional: dim look */
    }
    .btn:disabled:hover,
    .btn:disabled:active {
      background: #888;
      color: #ccc;
      transform: none;
      filter: none;
    }    


    .card {
      background: linear-gradient(180deg, #1c2246 0%, #151b39 100%);
      border: 1px solid var(--divider);
      border-radius: 16px;
      padding: 12px;
      box-shadow: 0 10px 30px rgba(0,0,0,.25);
    }
    .margin-top{
      margin-top: 12px;
    }
    .stack { display: grid; gap: 12px; }

    .astro-card {
      display: grid; gap: 10px;
      padding: 12px; border-radius: 14px; background: var(--card);
      border: 1px solid #222a55;
    }
    /* Type-colored cards */
    .astro-card.rocky {
      /* background-color: #3C3C3C; */
      border: 2px solid #C8A27A;
    }
    .astro-card.giant {
      /* background-color: #1E3A5F; */
      border: 2px solid #A7C7E7;
    }
    .astro-card.belt {
      /* background-color: #4B2A4F; */
      border: 2px solid #C4A1D9;
      /* border: 2px solid #808080; */
    }


    /* Optional: tint the small type label for readability */
    .astro-card.rocky .astro-type { color: color-mix(in oklab, var(--rocky-border) 70%, #e6eaff); }
    .astro-card.giant .astro-type { color: color-mix(in oklab, var(--giant-border) 70%, #e6eaff); }
    .astro-card.belt  .astro-type { color: color-mix(in oklab, var(--belt-border)  70%, #e6eaff); }


    .astro-top {
      display: flex; align-items: center; justify-content: space-between; gap: 6px;
    }
    .astro-name { font-weight: 700; letter-spacing: .3px; }
    .astro-type { color: var(--muted); font-size: 12px; }
    .astro-controls { display: grid; gap: 8px; }
    .row { display: flex; align-items: center; gap: 10px;}
    .row label { font-size: 12px; color: var(--text); width: 140px; } /* fixed label width */
    .row input[type="range"] {
      flex: 1;       /* permite que crezca y ocupe espacio */
      width: 100%;   /* ocupa todo el ancho disponible */
    }
           /* fixed slider width */
    .row span { font-size: 12px; }
    .row input[type="checkbox"] { align-items: center; }

    .hint { color: var(--text); font-size: 12px; line-height: 1.4; text-align: justify; }

    /* Canvas host */
    #canvas-host { height: 100vh; position: relative; }
    #canvas-host canvas { display: block; }

    /* Small screen fallback */
    @media (max-width: 900px) {
      #app { 
        grid-template-columns: 1fr;             /* one column */
        grid-template-rows: auto 1fr;           /* aside on top, canvas below */
      }

      aside { 
        position: sticky; 
        top: 0; 
        z-index: 2; 
        max-height: 34vh;                       /* sidebar height on phones */
        overflow-y: auto;                       /* scroll controls if tall */
      }

      #canvas-host { 
        height: 66vh;                           /* canvas takes the rest */
      }
    }


  .overlayText {
    position: absolute;
    top: 20px;
    left: 20px;
    font-size: 24px;
    color: white;
    z-index: 10;
    pointer-events: none;
  }
  .overlayText2 {
    position: absolute;
    top: 20px;
    right: 20px;       /* <-- top right corner */
    font-size: 48px;
    color: white;
    z-index: 10;
    pointer-events: none;
  }


  .grid {
    display: grid;
    grid-template-columns: 1fr 1fr;  /* 2 equal columns */
    grid-template-rows: auto auto;   /* 2 rows */
    gap: 2px;                       /* space between cells */
    width: 100%;
  }
  .grid {
    display: grid;
    grid-template-columns: auto auto; /* each column fits its content */
    justify-content: space-between;   /* push them apart */
    align-items: center;              /* optional: vertical centering */
    width: 100%;                      /* let it stretch across */
  }


/* .grid > div {
  background: lightgray;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
} */

  .checkbox-wrapper{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: left;
    text-align: left;
    margin-top: 0px;
  }
  .checkbox-wrapper label {
    display: flex;
    align-items: center;
    justify-content: left;
    text-align: center;
    text-align: left;
  }  
  .checkbox-wrapper input[type="checkbox"] {
    margin-right: 15px;
  }