/* Shared look for the star chart and astrolabe demos. */
  :root{
    --bg:#03050c; --panel:rgba(10,14,34,.78); --panel-solid:#0b1030; --line:rgba(120,140,230,.22);
    --text:#eee7d6; --dim:#9aa4d2; --faint:#6670a8; --accent:#e0a940; --accent-2:#7fb4ff;
    --field:rgba(255,255,255,.055); --radius:12px;
  }
  *{box-sizing:border-box;}
  html,body{height:100%;margin:0;background:var(--bg);color:var(--text);overflow:hidden;
    font:14px/1.45 "IBM Plex Sans",system-ui,sans-serif;-webkit-font-smoothing:antialiased;}
  #app{display:grid;grid-template-columns:minmax(0,1fr) 352px;height:100%;}
  #stage{position:relative;display:flex;flex-direction:column;min-width:0;min-height:0;}
  #sky{flex:1;width:100%;min-height:0;display:block;touch-action:none;cursor:grab;}
  #sky.dragging{cursor:grabbing;}
  #timeline{flex:none;height:74px;position:relative;border-top:1px solid var(--line);background:#02040a;}
  #timeline canvas{width:100%;height:100%;display:block;cursor:ew-resize;touch-action:none;}

  #topbar{position:absolute;top:0;left:0;right:0;display:flex;align-items:center;gap:12px;padding:12px 16px;pointer-events:none;z-index:3;}
  #topbar > *{pointer-events:auto;}
  .brand{font:600 24px "Cormorant Garamond",Georgia,serif;letter-spacing:.02em;color:var(--text);text-decoration:none;}
  .brand small{display:block;font:500 11px "IBM Plex Sans",sans-serif;color:var(--faint);letter-spacing:.14em;text-transform:uppercase;margin-top:-4px;}
  .tabs{display:flex;gap:2px;padding:3px;border-radius:999px;background:var(--panel);border:1px solid var(--line);backdrop-filter:blur(14px);margin:0 auto;}
  .tabs button{border:0;background:none;color:var(--dim);font:500 13px "IBM Plex Sans",sans-serif;padding:7px 14px;border-radius:999px;cursor:pointer;white-space:nowrap;}
  .tabs button[aria-selected="true"]{background:linear-gradient(180deg,#f0c15a,#d49a30);color:#1a1202;}
  .tabs button:hover:not([aria-selected="true"]){color:var(--text);}
  .tools{display:flex;gap:6px;}
  .icon{width:36px;height:36px;border-radius:50%;border:1px solid var(--line);background:var(--panel);color:var(--text);cursor:pointer;
    backdrop-filter:blur(14px);display:grid;place-items:center;font-size:15px;}
  .icon:hover{border-color:var(--accent);}
  #panel-toggle{display:none;}

  #panel{background:linear-gradient(180deg,rgba(14,19,48,.96),rgba(8,11,28,.98));border-left:1px solid var(--line);overflow-y:auto;overscroll-behavior:contain;
    padding:14px 14px 28px;scrollbar-width:thin;scrollbar-color:#2a3470 transparent;}
  details{border-bottom:1px solid var(--line);padding:2px 0 10px;}
  summary{list-style:none;cursor:pointer;font:600 17px "Cormorant Garamond",Georgia,serif;letter-spacing:.06em;text-transform:uppercase;color:var(--accent);padding:12px 0 8px;display:flex;justify-content:space-between;align-items:center;}
  summary::-webkit-details-marker{display:none;}
  summary::after{content:"+";color:var(--faint);font:500 16px "IBM Plex Sans";}
  details[open] summary::after{content:"\2212";}
  .row{display:flex;gap:6px;align-items:center;margin:6px 0;flex-wrap:wrap;}
  .row > label{color:var(--dim);font-size:12px;}
  .grow{flex:1;min-width:0;}
  input,select,button.btn{font:inherit;color:var(--text);background:var(--field);border:1px solid var(--line);border-radius:8px;padding:6px 8px;min-width:0;}
  input[type=number]{width:72px;}
  input[type=text]{width:100%;}
  select{max-width:100%;}
  select option{background:#10153a;color:var(--text);}
  input:focus-visible,select:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--accent-2);outline-offset:1px;}
  button.btn{cursor:pointer;padding:6px 10px;}
  button.btn:hover{border-color:var(--accent);}
  button.btn.primary{background:linear-gradient(180deg,#f0c15a,#d49a30);color:#1a1202;border-color:transparent;font-weight:600;}
  button.btn[aria-pressed="true"]:not(.primary){border-color:var(--accent);color:var(--accent);}
  input[type=range]{width:100%;padding:0;accent-color:var(--accent);background:none;border:0;}
  .chips{display:flex;flex-wrap:wrap;gap:6px;}
  .chip{position:relative;}
  .chip input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer;}
  .chip span{display:block;padding:5px 11px;border-radius:999px;border:1px solid var(--line);background:var(--field);color:var(--dim);font-size:12.5px;}
  .chip input:checked + span{background:rgba(224,169,64,.16);border-color:var(--accent);color:var(--text);}
  .chip input:focus-visible + span{outline:2px solid var(--accent-2);}
  .hint{color:var(--faint);font-size:12px;}
  #note{color:var(--dim);font-size:12.5px;font-style:italic;margin:2px 0 4px;}
  dl{display:grid;grid-template-columns:auto 1fr;gap:3px 12px;margin:6px 0;font-size:13px;}
  dt{color:var(--faint);} dd{margin:0;text-align:right;color:var(--text);font-variant-numeric:tabular-nums;}
  #selected{min-height:20px;}
  #selected h3{margin:0 0 2px;font:600 22px "Cormorant Garamond",Georgia,serif;color:var(--text);}
  #selected .sub{color:var(--dim);font-size:12.5px;margin-bottom:6px;}
  table{width:100%;border-collapse:collapse;font-size:12.5px;font-variant-numeric:tabular-nums;}
  th{font-weight:500;color:var(--faint);text-align:left;padding:2px 0;} td{padding:2px 0;color:var(--text);}
  td.r,th.r{text-align:right;}
  ol#passes{margin:6px 0 0;padding-left:18px;color:var(--dim);font-size:12.5px;}
  #tip{position:fixed;pointer-events:none;z-index:9;padding:5px 9px;border-radius:8px;background:rgba(6,9,24,.92);border:1px solid var(--line);
    font-size:12.5px;white-space:nowrap;display:none;box-shadow:0 6px 24px rgba(0,0,0,.5);}
  #tip b{font-weight:600;color:var(--accent);}
  .credit{color:var(--faint);font-size:11.5px;margin-top:14px;line-height:1.5;}
  .credit a{color:var(--dim);}
  kbd{font:11px "IBM Plex Sans";background:var(--field);border:1px solid var(--line);border-radius:4px;padding:0 5px;color:var(--dim);}

  @media (max-width:860px){
    #app{grid-template-columns:1fr;}
    #panel{position:fixed;left:0;right:0;bottom:0;max-height:64vh;z-index:6;border-left:0;border-top:1px solid var(--line);
      border-radius:18px 18px 0 0;transform:translateY(101%);transition:transform .25s ease;padding-bottom:calc(28px + env(safe-area-inset-bottom));}
    body.panel-open #panel{transform:none;box-shadow:0 -20px 60px rgba(0,0,0,.6);}
    #panel-toggle{display:grid;}
    .brand small{display:none;}
    .tabs button{padding:6px 10px;font-size:12px;}
    #topbar{padding:10px;gap:8px;}
    #timeline{height:62px;}
  }
  @media (max-width:520px){ .brand{font-size:20px;} .tabs{margin:0;} .tools .opt{display:none;} }
  @media (prefers-reduced-motion:reduce){ #panel{transition:none;} }