:root{
  --cell:#0D2B4E;--cell-2:#163F6E;--line:#2A5C92;
  --sun:#F5B400;--sun-soft:#FFF3CC;--sun-ink:#5A3F00;
  --bg:#F3F7FB;--card:#FFFFFF;--ink:#0B1B2E;--muted:#55677D;--border:#D9E3EE;
  --wa:#1FA855;--danger:#C6372F;
  box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#07131F;--card:#0F2236;--ink:#EAF1F8;--muted:#9BB0C6;--border:#21405F;
  --sun-soft:#3A2E05;--sun-ink:#FFD666;color-scheme:dark;}}
:root[data-theme="dark"]{--bg:#07131F;--card:#0F2236;--ink:#EAF1F8;--muted:#9BB0C6;--border:#21405F;--sun-soft:#3A2E05;--sun-ink:#FFD666;color-scheme:dark;}
*,*::before,*::after{box-sizing:border-box}
html{scroll-padding-top:env(safe-area-inset-top,0px);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"IBM Plex Sans Arabic",Tahoma,"Segoe UI",sans-serif;font-size:16px;line-height:1.7}
h1,h2,h3,.disp{font-family:Alexandria,"IBM Plex Sans Arabic",Tahoma,sans-serif;line-height:1.3;margin:0}
button,input,select{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:3px solid var(--sun);outline-offset:2px;border-radius:6px}
.wrap{max-width:720px;margin:0 auto;padding:0 18px}

/* header */
.top{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:inherit}
.brand b{font-family:Alexandria,sans-serif;font-size:1.05rem;display:block;line-height:1.2}
.brand small{color:var(--muted);font-size:.8rem}
.call{border:1px solid var(--border);background:var(--card);padding:8px 14px;border-radius:999px;text-decoration:none;color:inherit;font-weight:600;font-size:.9rem;display:flex;gap:6px;align-items:center}

/* hero: a solar panel */
.hero{position:relative;overflow:hidden;border-radius:22px;color:#fff;padding:30px 22px 26px;
  background:
   linear-gradient(90deg,transparent 0 calc(100% - 1px),rgba(120,170,230,.28) 0) 0 0/ 46px 100%,
   linear-gradient(0deg,transparent 0 calc(100% - 1px),rgba(120,170,230,.28) 0) 0 0/ 100% 46px,
   linear-gradient(160deg,var(--cell-2),var(--cell) 65%);}
.hero::after{content:"";position:absolute;width:190px;height:190px;border-radius:50%;top:-70px;left:-50px;
  background:radial-gradient(circle,#FFE38A 0,var(--sun) 45%,rgba(245,180,0,0) 70%);}
.hero>*{position:relative;z-index:1}
.hero h1{font-size:clamp(1.65rem,6.4vw,2.4rem);font-weight:800;max-width:15ch}
.hero p{margin:12px 0 0;color:#C9DBF0;max-width:42ch;font-size:.98rem}

/* tabs */
.tabs{display:grid;grid-template-columns:1fr 1fr;gap:6px;background:var(--card);border:1px solid var(--border);padding:5px;border-radius:16px;margin:20px 0 6px;position:sticky;top:env(safe-area-inset-top,0px);z-index:5}
.tabs button{border:0;background:transparent;padding:11px 8px;border-radius:12px;font-weight:700;color:var(--muted)}
.tabs button[aria-selected="true"]{background:var(--cell);color:#fff}
section{padding:14px 0}
.lead{color:var(--muted);margin:4px 0 16px;font-size:.95rem}

/* kits */
.kits{display:grid;gap:14px}
.kit{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:18px;display:grid;gap:12px}
.kit h3{font-size:1.12rem}
.amps{display:flex;gap:8px;flex-wrap:wrap}
.amp{display:inline-flex;align-items:center;gap:6px;padding:5px 12px;border-radius:999px;font-weight:600;font-size:.9rem}
.amp.d{background:var(--sun-soft);color:var(--sun-ink)}
.amp.n{background:var(--cell);color:#fff}
.kit .row{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.price{font-family:Alexandria,sans-serif;font-weight:800;font-size:1.35rem;direction:rtl}
.price small{font-size:.8rem;font-weight:500;color:var(--muted);margin-inline-start:4px}
.parts{margin:0;padding:0;list-style:none;color:var(--muted);font-size:.9rem;display:grid;gap:2px}
.btn{border:0;border-radius:14px;padding:12px 18px;font-weight:700;display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none}
.btn.wa{background:var(--wa);color:#fff}
.btn.ghost{background:transparent;border:1px solid var(--border);color:var(--ink)}
.btn.dark{background:var(--cell);color:#fff}

/* custom builder */
.dials{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.dial{border-radius:20px;padding:16px 12px;text-align:center;display:grid;gap:6px;justify-items:center}
.dial.d{background:var(--sun-soft);color:var(--sun-ink)}
.dial.n{background:var(--cell);color:#fff}
.dial .lbl{font-weight:700;display:flex;gap:6px;align-items:center}
.dial input{width:3.2ch;border:0;background:transparent;text-align:center;font-family:Alexandria,sans-serif;font-weight:800;font-size:3rem;line-height:1.1;padding:0;-moz-appearance:textfield}
.dial input::-webkit-outer-spin-button,.dial input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.dial .unit{font-size:.85rem;opacity:.85;margin-top:-6px}
.step{display:flex;gap:10px}
.step button{width:46px;height:46px;border-radius:50%;border:0;font-size:1.5rem;font-weight:700;line-height:1}
.dial.d .step button{background:#fff;color:var(--sun-ink)}
.dial.n .step button{background:rgba(255,255,255,.14);color:#fff}
.hint{font-size:.85rem;color:var(--muted);margin:12px 2px 0}
.choose{margin-top:18px;display:grid;gap:14px}
.choose h3{font-size:.95rem;margin-bottom:8px}
.chips{display:flex;gap:8px;overflow-x:auto;padding-bottom:4px;scrollbar-width:none}
.chip{flex:0 0 auto;border:1px solid var(--border);background:var(--card);border-radius:999px;padding:8px 14px;font-size:.88rem;font-weight:600;white-space:nowrap}
.chip[aria-pressed="true"]{border-color:var(--cell);background:var(--cell);color:#fff}
.summary{margin-top:18px;background:var(--card);border:1px solid var(--border);border-radius:18px;padding:16px 18px}
.summary h3{font-size:1rem;margin-bottom:8px}
.summary dl{margin:0;display:grid;gap:8px}
.summary dl div{display:flex;justify-content:space-between;gap:12px;border-bottom:1px dashed var(--border);padding-bottom:8px}
.summary dl div:last-child{border:0;padding:0}
.summary dt{color:var(--muted)}
.summary dd{margin:0;font-weight:600;text-align:left}
.spacer{height:96px}
.bar{position:fixed;bottom:0;left:0;right:0;z-index:20;background:var(--card);border-top:1px solid var(--border);padding:12px 18px calc(12px + env(safe-area-inset-bottom,0px));transform:translateY(110%);transition:transform .25s ease}
.bar.show{transform:none}
.bar .in{max-width:720px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:12px}
.bar .t{font-size:.8rem;color:var(--muted);display:block}

/* info */
.info{display:grid;gap:12px}
.info div{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:14px 16px}
.info b{display:block;font-family:Alexandria,sans-serif;margin-bottom:2px}
.info p{margin:0;color:var(--muted);font-size:.92rem}
footer{padding:26px 0 30px;color:var(--muted);font-size:.9rem;text-align:center}
footer a{color:inherit}

/* sheet */
.veil{position:fixed;inset:0;background:rgba(3,12,22,.55);z-index:40;display:none}
.veil.open{display:block}
.sheet{position:fixed;left:0;right:0;bottom:0;z-index:41;background:var(--card);border-radius:22px 22px 0 0;max-height:88%;overflow:auto;padding:20px 20px calc(20px + env(safe-area-inset-bottom,0px));transform:translateY(105%);transition:transform .25s ease;max-width:720px;margin:0 auto}
.sheet.open{transform:none}
.sheet h2{font-size:1.2rem;margin-bottom:10px}
.field{display:grid;gap:4px;margin-top:12px}
.field label{font-size:.88rem;font-weight:600}
.field input,.field select{border:1px solid var(--border);background:var(--bg);border-radius:12px;padding:11px 12px;width:100%}
.sheet .btn{width:100%;margin-top:16px;padding:14px}
.grab{width:44px;height:5px;border-radius:9px;background:var(--border);margin:-6px auto 14px}

/* admin */
.admin-fab{position:fixed;left:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px));z-index:30;background:var(--ink);color:var(--bg);border:0;border-radius:999px;padding:10px 16px;font-weight:700;font-size:.88rem;box-shadow:0 6px 18px rgba(0,0,0,.25)}
.adm{position:fixed;inset:0;z-index:60;background:var(--bg);overflow:auto;display:none;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
.adm.open{display:block}
.adm-head{position:sticky;top:0;background:var(--bg);z-index:2;border-bottom:1px solid var(--border)}
.adm-head .wrap{display:flex;justify-content:space-between;align-items:center;padding-top:12px;padding-bottom:12px;gap:10px}
.adm-tabs{display:flex;gap:6px;overflow-x:auto;padding:0 18px 10px;max-width:720px;margin:0 auto;scrollbar-width:none}
.adm-tabs button{flex:0 0 auto;border:1px solid var(--border);background:var(--card);padding:7px 14px;border-radius:999px;font-weight:600;font-size:.88rem}
.adm-tabs button[aria-selected="true"]{background:var(--cell);color:#fff;border-color:var(--cell)}
.adm .card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:14px;margin-top:12px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.item{display:grid;grid-template-columns:1fr 1fr;gap:8px 10px;align-items:end}
.item .full{grid-column:1/-1}
.item .del{border:1px solid var(--border);background:transparent;color:var(--danger);border-radius:12px;padding:10px;font-weight:600}
.iqd{font-size:.8rem;color:var(--muted)}
.status{font-size:.88rem;margin:10px 0 0;min-height:1.4em}
.status.err{color:var(--danger)}
.adm .field{margin-top:0}
@media (min-width:640px){.kits{grid-template-columns:1fr 1fr}.info{grid-template-columns:repeat(3,1fr)}.item{grid-template-columns:2fr 1fr 1fr auto}.item .full{grid-column:auto}}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}