/* WattCruncher shared stylesheet */
:root{
  --bg:#0f172a;--card:#ffffff;--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;
  --brand:#0ea5e9;--brand-dark:#0284c7;--accent:#16a34a;--soft:#f8fafc;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--soft);line-height:1.6}
a{color:var(--brand-dark);text-decoration:none}
a:hover{text-decoration:underline}
header.site{background:var(--bg);color:#fff;padding:14px 20px}
header.site .wrap{max-width:1080px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:12px}
.logo{font-weight:800;font-size:1.15rem;letter-spacing:-.02em;color:#fff}
.logo:hover{text-decoration:none}
.logo span{color:var(--brand)}
nav a{color:#cbd5e1;margin-left:18px;font-size:.9rem}
.container{max-width:1080px;margin:0 auto;padding:0 20px}
.layout{display:grid;grid-template-columns:1fr 300px;gap:28px;margin:28px auto}
@media(max-width:900px){.layout{grid-template-columns:1fr}}
h1{font-size:1.9rem;line-height:1.2;margin:.2em 0 .1em;letter-spacing:-.02em}
.sub{color:var(--muted);margin:0 0 18px;font-size:1.02rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:0 1px 2px rgba(15,23,42,.04)}
.calc h2{margin:.1em 0 .6em;font-size:1.2rem}
.tabs{display:flex;gap:8px;margin-bottom:18px;flex-wrap:wrap}
.tab{border:1px solid var(--line);background:#fff;border-radius:999px;padding:8px 16px;font-size:.9rem;cursor:pointer;font-weight:600;color:var(--muted)}
.tab.active{background:var(--brand);border-color:var(--brand);color:#fff}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:520px){.grid{grid-template-columns:1fr}}
label{display:block;font-size:.82rem;font-weight:600;color:var(--muted);margin-bottom:5px}
.field input,.field select{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:10px;font-size:1rem;background:#fff}
.field input:focus,.field select:focus{outline:2px solid var(--brand);border-color:var(--brand)}
.hint{font-size:.74rem;color:var(--muted);margin-top:4px}
.result{margin-top:20px;background:linear-gradient(135deg,#ecfeff,#f0fdf4);border:1px solid #bae6fd;border-radius:14px;padding:20px;text-align:center}
.result .big{font-size:2.4rem;font-weight:800;color:var(--brand-dark);letter-spacing:-.02em}
.result .row{display:flex;justify-content:space-around;flex-wrap:wrap;gap:10px;margin-top:12px}
.result .stat{min-width:120px}
.result .stat b{display:block;font-size:1.25rem;color:var(--ink)}
.result .stat span{font-size:.76rem;color:var(--muted)}
.save{color:var(--accent);font-weight:700}
.adslot{background:repeating-linear-gradient(45deg,#f1f5f9,#f1f5f9 10px,#eef2f7 10px,#eef2f7 20px);
  border:1px dashed #cbd5e1;border-radius:12px;color:#94a3b8;text-align:center;font-size:.75rem;
  display:flex;align-items:center;justify-content:center;letter-spacing:.05em}
.adslot.leaderboard{height:110px;margin:24px 0}
.adslot.box{height:250px;margin-bottom:24px}
.adslot.incontent{height:120px;margin:26px 0}
.email{background:#0f172a;color:#fff;border-radius:14px;padding:22px;margin:26px 0}
.email h3{margin:.1em 0 .4em}
.email p{color:#cbd5e1;font-size:.92rem;margin:0 0 12px}
.email form{display:flex;gap:8px;flex-wrap:wrap}
.email input{flex:1;min-width:200px;padding:11px 12px;border-radius:10px;border:0;font-size:1rem}
.email button,button.primary{background:var(--brand);color:#fff;border:0;border-radius:10px;padding:12px 20px;font-weight:700;font-size:1rem;cursor:pointer}
.email button:hover,button.primary:hover{background:var(--brand-dark)}
section.prose{margin:30px 0}
section.prose h2{font-size:1.35rem;margin:1.2em 0 .4em}
section.prose h3{font-size:1.05rem;margin:1.1em 0 .3em}
.formula{background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:12px 14px;font-family:monospace;font-size:.9rem}
table.compare{width:100%;border-collapse:collapse;margin:14px 0;font-size:.92rem}
table.compare th,table.compare td{border:1px solid var(--line);padding:9px 11px;text-align:left}
table.compare th{background:var(--soft)}
details{border:1px solid var(--line);border-radius:10px;padding:4px 14px;margin:10px 0;background:#fff}
details summary{font-weight:600;cursor:pointer;padding:8px 0}
.siblings{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:8px}
@media(max-width:520px){.siblings{grid-template-columns:1fr}}
.siblings a{display:block;border:1px solid var(--line);border-radius:10px;padding:12px 14px;background:#fff;font-weight:600}
.siblings a:hover{border-color:var(--brand);text-decoration:none}
aside .card{position:sticky;top:20px}
footer{background:var(--bg);color:#94a3b8;font-size:.82rem;margin-top:40px;padding:26px 20px}
footer .wrap{max-width:1080px;margin:0 auto}
footer a{color:#cbd5e1}
.disc{font-size:.78rem;color:var(--muted);background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin-top:18px}
/* homepage / index */
.hero{text-align:center;padding:40px 0 10px}
.hero h1{font-size:2.4rem}
.toolgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:24px 0}
@media(max-width:820px){.toolgrid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.toolgrid{grid-template-columns:1fr}}
.toolcard{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;color:var(--ink)}
.toolcard:hover{border-color:var(--brand);text-decoration:none;box-shadow:0 4px 14px rgba(2,132,199,.08)}
.toolcard .ico{font-size:1.6rem}
.toolcard b{display:block;margin:8px 0 4px;font-size:1.02rem}
.toolcard span{font-size:.85rem;color:var(--muted)}
.badge{display:inline-block;background:#ecfeff;color:var(--brand-dark);border:1px solid #bae6fd;border-radius:999px;font-size:.72rem;padding:2px 10px;font-weight:700;margin-bottom:8px}