/* Base theme (light) */
:root{
  --card-bg:#ffffff;
  --bg:#f4f5f7;
  --accent:#1f6feb;
  --ink:#111;
  --muted:#666;
  --summary-bg:#fffbf0;
  --ok:#1a7f37;
  --warn:#b7791f;
  --bad:#b91c1c;
  --chip-bg:#eef2ff;
  --chip-text:#1e1b4b;

  --shadow:0 6px 18px rgba(10,10,10,.06);
  --shadow-hover:0 10px 24px rgba(10,10,10,.08);
}

/* Dark mode */
body[data-theme="dark"]{
  --bg:#0d1117; --card-bg:#161b22; --accent:#58a6ff;
  --ink:#e6edf3; --muted:#9aa5b1; --summary-bg:#1f242c;
  --chip-bg:#21262d; --chip-text:#c9d1d9;
}

/* Topo vibe + gentle sky band */
body{
  font-family:Inter,system-ui,Segoe UI,Roboto,Arial;
  margin:0;
  background:
    radial-gradient(1200px 500px at 50% -200px, rgba(255,255,255,.06), transparent 70%),
    var(--bg);
  color:var(--ink);
}
body::after{
  content:"";
  position:fixed; inset:0; pointer-events:none;
  background-image:
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='400' height='400' viewBox='0 0 400 400'><g fill='none' stroke='%23ffffff' stroke-opacity='.05' stroke-width='1'><path d='M0,50 C100,70 300,30 400,50'/><path d='M0,150 C130,180 260,120 400,150'/><path d='M0,250 C120,280 280,220 400,250'/><path d='M0,350 C90,370 310,330 400,350'/></g></svg>");
  background-size:400px 400px;
}

.topbar{
  display:flex; align-items:center; justify-content:space-between;
  padding:10px 16px; position:sticky; top:0; z-index:10;
  background:linear-gradient(180deg, rgba(255,255,255,.06), transparent);
  backdrop-filter:saturate(120%) blur(6px);
}
.brand{display:flex; gap:8px; align-items:center; font-weight:600;}
.glyph{font-size:18px;}
.title{font-size:14px; opacity:.9;}

.theme-switch{display:flex;gap:6px;opacity:.95}
.theme-switch button{padding:6px 8px;font-size:12px}
.btn-ghost{background:#fff;border:1px solid #ddd;color:#111;}
body[data-theme="dark"] .btn-ghost{background:#161b22;color:#e6edf3;border:1px solid #444;}

/* Grid layout */
.grid{
  display:grid;
  gap:12px;
  padding:14px;
  width:min(1800px, 90vw);
  margin:0 auto;
}
.row{display:grid;gap:12px;align-items:start;justify-items:stretch;}
.row.seven{ grid-template-columns: repeat(7, minmax(180px, 1fr)); }
.row.one{ grid-template-columns: 1fr; }
.row.three{ grid-template-columns: repeat(3, 1fr); }

.row.equal-cols .col{ display:flex; flex-direction:column; height:100%; }

.col{
  background:var(--card-bg);
  border-radius:12px;
  padding:12px;
  box-shadow:var(--shadow);
  box-sizing:border-box;
  display:flex; flex-direction:column;
  transition:box-shadow .2s ease;
}
.col:hover{ box-shadow:var(--shadow-hover); }
.col h2{margin:4px 0 8px;font-size:16px;}
h3{margin:6px 0;font-size:14px;opacity:.9;}

label{display:block;font-size:13px;margin:6px 0;}
label small{ color:var(--muted); margin-left:6px; }
input,select{
  width:100%;padding:8px;border-radius:8px;border:1px solid #ddd;box-sizing:border-box;
  background:#fff;
}
body[data-theme="dark"] input,body[data-theme="dark"] select{background:#0d1117;color:var(--ink);border:1px solid #444;}

.small{font-size:13px;color:var(--muted);margin:6px 0;}
.actions{display:flex;gap:8px;margin-top:8px;}
.actions.sticky{position:sticky;bottom:0;background:linear-gradient(180deg, transparent, rgba(0,0,0,.04));padding-top:6px;backdrop-filter:saturate(120%) blur(4px);border-top-left-radius:8px;border-top-right-radius:8px;}
.mt8{margin-top:8px;}

/* Table */
table{width:100%;border-collapse:collapse;margin-top:8px;font-size:13px;font-variant-numeric:tabular-nums;}
thead th{position:sticky;top:0;background:var(--card-bg);z-index:1;}
th,td{border:1px solid #e6e9ee;padding:6px;text-align:center;}
tbody tr:hover{background:rgba(0,0,0,.03);}
td .toggle{transform:scale(1.15);}

/* Buttons */
button{padding:7px 10px;border-radius:8px;border:0;cursor:pointer;background:var(--accent);color:#fff;transition:transform .06s ease, box-shadow .2s ease;}
button:active{transform:translateY(1px);}

/* Graphs */
canvas{background:#fff;border-radius:8px;display:block;width:100%;height:120px;}
body[data-theme="dark"] canvas{background:#161b22;}
canvas.mini{height:clamp(160px, 22vh, 300px);margin-top:auto;}
#deviceBar{margin-top:6px;height:clamp(220px, 28vh, 360px);}

/* Summary */
.calc-list p{margin:8px 0;font-size:15px;line-height:1.5;color:var(--ink);}
.calc-list p span.value{font-weight:600;}
.summary{background:var(--summary-bg);flex:1;border-left:4px solid #2d7ff9;}

/* Optimisation */
.opt-wrap{display:grid;grid-template-columns:1fr 1fr;gap:8px;}
.opt-list{list-style:none;padding:0;margin:0;}
.opt-list li{display:flex;align-items:baseline;justify-content:space-between;gap:8px;padding:6px 8px;border:1px solid #e6e9ee;border-radius:8px;margin-bottom:6px;font-size:13px;}
.badge{padding:2px 6px;border-radius:999px;font-size:12px;border:1px solid #e6e9ee;background:var(--chip-bg);color:var(--chip-text);white-space:nowrap;}
.status-keep{color:var(--ok);font-weight:600;}
.status-shed{color:var(--bad);font-weight:600;}

/* Resource colors */
.col[data-kind="solar"]{ border-left:4px solid yellow; }
.col[data-kind="alt"]{ border-left:4px solid orange; }
.col[data-kind="shore"]{ border-left:4px solid darkred; }
.col[data-kind="battery"]{ border-left:4px solid darkblue; }
.col[data-kind="water"]{ border-left:4px solid blue; }
.col[data-kind="diesel"]{ border-left:4px solid black; }
.col[data-kind="lpg"]{ border-left:4px solid purple; }

/* Responsive */
@media (max-width:1300px){ .row.seven{ grid-template-columns: repeat(4, minmax(180px, 1fr)); } }
@media (max-width:900px){ .row.seven{ grid-template-columns: repeat(3, minmax(160px, 1fr)); } .row.three{ grid-template-columns: 1fr; } }
@media (max-width:700px){ .row.seven{ grid-template-columns: 1fr 1fr; } .row.one,.row.three{ grid-template-columns: 1fr; } .opt-wrap{grid-template-columns:1fr;} }

/* A11y */
:focus-visible{outline:2px solid var(--accent); outline-offset:2px;}
@media (prefers-reduced-motion: reduce){ *{animation:none!important; transition:none!important;} }