* { box-sizing: border-box; }
body { font-family: Segoe UI, Roboto, Arial, sans-serif; margin: 0; padding: 0; color: #0f172a; background: #f8fafc; }
header { padding: 10px 16px; background: #fff; border-bottom: 1px solid #e2e8f0; }
header h1 { margin: 0; font-size: 18px; color: #0ea5e9; }
header .subtitle { margin: 2px 0 0; color: #334155; font-size: 12px; }
main { padding: 12px 16px; max-width: 1200px; }

section { margin: 16px 0; }
.grid.two { display: grid; grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); gap: 12px; }
fieldset { background: #fff; border: 1px solid #e2e8f0; border-radius: 8px; padding: 10px; }
legend { padding: 0 6px; color: #0f172a; font-weight: 600; }
.checkbox { display: flex; align-items: center; gap: 8px; margin: 6px 0; }
.triple { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin-top: 6px; }
.stack { display: grid; grid-auto-rows: auto; gap: 6px; margin-top: 6px; }
.line { display: flex; align-items: center; gap: 8px; }
.inline { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.row { display: flex; align-items: center; gap: 10px; }
.center-row { display:flex; justify-content:center; }

/* Compact five-row optimizer table */
.opt-table { display:grid; grid-template-columns: 1.6fr 0.9fr 0.9fr 0.9fr 0.8fr; gap: 8px 12px; align-items:center; background:#fff; border:1px solid #e2e8f0; border-radius:8px; padding:10px; }
.opt-table .hdr { font-weight:700; color:#0f172a; }
.opt-table .cell.fuel { font-weight:600; color:#334155; }
.opt-table .cell.center { display:flex; justify-content:center; }
.opt-table input[type=number] { width: 90px; }

label { color: #334155; font-size: 12px; display: grid; gap: 4px; }
input[type=number], input[type=text], select { padding: 4px 6px; border: 1px solid #cbd5e1; border-radius: 6px; background: #fff; font-size: 12px; }
input[readonly] { background: #f1f5f9; }

.actions { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
button { background: #0ea5e9; color: white; border: none; padding: 8px 10px; border-radius: 8px; cursor: pointer; font-weight: 600; font-size: 13px; }
button[disabled] { opacity: 0.6; cursor: default; }
button#stop { background: #ef4444; }

.status { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 12px; }
.progress { height: 12px; background: #e2e8f0; border-radius: 8px; overflow: hidden; }
.bar { height: 100%; background: linear-gradient(90deg, #22c55e, #16a34a); transition: width .2s ease; }
.progress-text { display: flex; gap: 10px; color: #334155; font-size: 12px; }

#log { width: 100%; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; background: #111827; color: #e5e7eb; border: 1px solid #1f2937; border-radius: 8px; padding: 8px; font-size: 12px; }

footer { padding: 10px 24px; color: #475569; }