:root{
  --bg:#0b1220;
  --bg2:#101827;
  --panel:#0f172a;
  --line:#334155;
  --text:#e5e7eb;
  --muted:#94a3b8;
  --sky:#38bdf8;
  --white:#ffffff;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:linear-gradient(to bottom,var(--bg),var(--bg2));color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Inter,Helvetica,Arial,sans-serif}
.container{max-width:1080px;margin:0 auto;padding:0 16px}
.pad-t{padding-top:28px}
.pad-b{padding-bottom:80px}
.logo-wrap{display:flex;justify-content:center}
.logo{height:56px}
.title{margin:16px 0 6px 0;text-align:center;font-weight:900;letter-spacing:.2px}
.subtitle{margin:0 auto 8px auto;max-width:780px;text-align:center;color:var(--muted)}

/* Meter */
.sticky{position:sticky;top:0;z-index:50}
.meter{background:black;border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:0 10px 30px rgba(0,0,0,.25);position:relative;overflow:hidden}
.meter::after{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(circle at 20% 30%, rgba(56,189,248,.4) 0, transparent 40%),radial-gradient(circle at 80% 70%, rgba(56,189,248,.4) 0, transparent 40%);opacity:.15}
.meter-head{display:flex;justify-content:space-between;align-items:flex-end}
.kicker{text-transform:uppercase;color:#7dd3fc;font-size:11px;letter-spacing:.12em}
.big{font-size:28px;font-weight:900}
.right{text-align:right}
.bar{height:28px;border-radius:999px;background:rgba(255,255,255,.1);overflow:hidden;margin-top:6px}
.fill{height:100%;background:var(--sky);transition:width .25s ease}
.bar-labels{display:flex;justify-content:space-between;color:#bae6fd;font-size:11px;margin-top:6px}
.note{margin-top:8px;color:#e2f2ff;font-size:14px}

/* Grid */
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-bottom:8px}
.col-span-2{grid-column:span 2}

/* Cards */
.card{background:rgba(15,23,42,.8);backdrop-filter:blur(4px);border:1px solid var(--line);border-radius:18px;padding:16px;box-shadow:0 4px 16px rgba(0,0,0,.2)}
.card h2{margin:0 0 6px 0;font-size:18px}
.desc{margin:0 0 10px 0;color:var(--muted);font-size:13px}
.label-row{display:flex;justify-content:space-between;align-items:center;margin:8px 0 6px 0}
.label{color:#c2e6fb;font-weight:600;font-size:13px}
.control{margin:8px 0}
.hidden{display:none}
.small{font-size:12px;color:var(--muted)}

/* Checkboxes, radios */
.chk{display:flex;gap:8px;align-items:center;font-size:14px;color:var(--text)}
.chk input{accent-color:var(--sky)}
.stack{display:flex;flex-direction:column;gap:6px}

/* Stepper */
.stepper{display:flex;align-items:center;gap:8px}
.stepper input[type=range]{flex:1;accent-color:var(--sky);height:24px}
.btn{background:#0b1220;border:1px solid var(--line);color:var(--text);padding:4px 10px;border-radius:10px;cursor:pointer}
.btn:hover{background:#0f172a}
.value{min-width:40px;text-align:right;font-size:12px;color:var(--muted)}

/* Segmented */
.seg3{display:inline-flex;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.seg{background:#0b1220;color:var(--text);padding:6px 10px;font-size:14px;border:0;cursor:pointer}
.seg[aria-pressed=true],.seg.active{background:var(--sky);color:black}

/* Summary */
.sticky-b{position:sticky;bottom:0;z-index:40}
.summary{background:#0f172a;border:1px solid var(--line);border-radius:18px;padding:12px 16px;box-shadow:0 4px 16px rgba(0,0,0,.3);display:flex;gap:16px;align-items:center}
.sum-line{font-size:14px;color:var(--text)}
.hint{font-size:11px;color:#93c5fd;margin-left:6px}

@media (max-width:900px){.grid{grid-template-columns:1fr}.grid-2{grid-template-columns:1fr}}