:root{
  --primary-bg:#0D1B2A;
  --secondary-bg:#112233;
  --card-bg:#142834;
  --primary-text:#E0E0E0;
  --accent-green:#A3E635;
  --accent-amber:#FFC56E;
  --muted:#98A2B3;
  --glass: rgba(255,255,255,0.03);
  --shadow-dark: rgba(0,0,0,0.5);
}
.sleep-tool {
/* Page */
html,body{height:100%;margin:0;background:linear-gradient(180deg,var(--primary-bg),#071422);color:var(--primary-text);font-family:Inter,Segoe UI,system-ui,Arial;display:flex;align-items:center;justify-content:center;padding:24px;}
.app {width:100%;max-width:980px;display:grid;grid-template-columns: 1fr 420px;gap:24px;}

/* Card */
.panel {background: linear-gradient(145deg,var(--card-bg),rgba(10,20,30,0.7));border-radius:14px;padding:18px;box-shadow: 8px 12px 30px var(--shadow-dark), inset 0 1px 0 rgba(255,255,255,0.02);border:1px solid rgba(255,255,255,0.02);}
header h1{margin:0;font-size:20px;color:var(--accent-green)} header p{margin:8px 0 0;color:var(--muted);font-size:13px;}

/* Input layout */
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:12px;}
label{display:block;font-weight:600;margin-bottom:6px;font-size:13px;color:var(--muted)}
input[type=time], select, input[type=date], input[type=text], input[type=number]{
  width:100%;padding:10px;border-radius:10px;border:1px solid rgba(255,255,255,0.04);
  background:var(--glass);color:var(--primary-text);font-size:14px;box-shadow: inset 0 2px 6px rgba(0,0,0,0.4);
}
.time-split{display:flex;gap:6px}
.time-part{width:33%;padding:8px;border-radius:8px;background:transparent;color:var(--primary-text);border:1px solid rgba(255,255,255,0.04);}

/* Buttons */
.controls{display:flex;gap:12px;margin-top:12px;}
button.primary{flex:1;background:linear-gradient(180deg,var(--accent-green),#7ece4a);color:#041712;border:none;padding:12px 14px;border-radius:12px;font-weight:700;cursor:pointer;box-shadow: 0 6px 18px rgba(0,0,0,0.45);}
button.ghost{background:transparent;border:1px solid rgba(255,255,255,0.06);color:var(--primary-text);padding:10px 12px;border-radius:12px;cursor:pointer}

/* form errors */
.errors{color:#ffb3b3;background:rgba(255,0,0,0.03);padding:8px;border-radius:8px;margin-top:8px;display:none}

/* Results & grid */
#results{grid-column:1/-1;margin-top:12px}
.result-description{font-size:14px;color:var(--accent-amber);margin-bottom:8px}
.result-heading{font-size:16px;color:var(--accent-green);margin-bottom:8px}
.result-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:12px}
.result-box{background:linear-gradient(145deg,rgba(255,255,255,0.02),rgba(255,255,255,0.01));padding:14px;border-radius:12px;border:1px solid rgba(255,255,255,0.03);box-shadow:6px 8px 20px rgba(0,0,0,0.45);font-weight:700;color:var(--primary-text)}
.results-inner{display:grid;grid-template-columns:1fr;gap:12px}
.timeline-card{background:linear-gradient(145deg,#0f2633,#0b1b24);border-radius:12px;padding:14px;border:1px solid rgba(255,255,255,0.03);box-shadow:6px 8px 20px rgba(0,0,0,0.5);}
.timeline-card h4{margin:0;color:var(--accent-amber)} .timeline-card p{margin:8px 0 0;color:var(--muted);font-size:14px}
.steps{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.step{background:var(--glass);padding:8px 10px;border-radius:10px;color:var(--primary-text);font-weight:600;font-size:13px;border:1px solid rgba(255,255,255,0.03)}
.highlight{color:var(--accent-green);font-weight:700}

/* small */
.note{font-size:13px;color:var(--muted);margin-top:8px}

/* responsive */
@media (max-width:980px){.app{grid-template-columns:1fr;padding:12px}.form-row{grid-template-columns:1fr}.time-part{width:30%}}