/* SIMPIAN ROI Calculator — mobile-first */
:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #0f1722;
  --ink-soft: #4b5563;
  --muted: #8b94a3;
  --border: #e5e7eb;
  --accent: #0e7c5c;       /* SIMPIAN green */
  --accent-soft: #e6f4ee;
  --accent-ink: #064e3b;
  --warn: #b45309;
  --bar: #14a37f;
  --shadow: 0 1px 2px rgba(15,23,34,.06), 0 4px 12px rgba(15,23,34,.04);
  --radius: 14px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink); }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, sans-serif;
  font-size: 16px; line-height: 1.45;
  padding-bottom: 96px; /* room for sticky strip */
}

/* header */
header.app {
  position: sticky; top: 0; z-index: 20;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  display: flex; align-items: center; gap: 12px;
}
.brand {
  font-weight: 700; letter-spacing: 0.02em;
  font-size: 18px; color: var(--accent-ink);
  display: flex; align-items: center; gap: 8px;
}
.brand::before {
  content: ""; width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent); display: inline-block;
}
.spacer { flex: 1; }
.btn {
  appearance: none; border: 1px solid var(--border); background: var(--surface);
  color: var(--ink); padding: 8px 14px; border-radius: 999px;
  font-size: 14px; font-weight: 500; cursor: pointer;
  transition: transform .06s, background .15s;
}
.btn:hover { background: #f0f2f5; }
.btn:active { transform: scale(.97); }
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.btn.primary {
  background: var(--accent); color: #fff; border-color: var(--accent);
}
.btn.primary:hover { background: #0a6850; }
.btn.ghost { background: transparent; }

/* layout */
main {
  width: 100%; max-width: 1100px; margin: 0 auto; padding: 16px;
  display: grid; grid-template-columns: 1fr; gap: 16px;
}
main > * { min-width: 0; }
@media (min-width: 880px) {
  main { grid-template-columns: 1.1fr 1fr; }
  .results-col {
    position: sticky;
    top: 72px;
    align-self: start;
    max-height: calc(100vh - 88px);
    overflow: auto;
  }
}

.hero {
  grid-column: 1 / -1;
  padding: 4px 4px 0;
}
.hero h1 { margin: 0 0 4px; font-size: 22px; }
.hero p { margin: 0; color: var(--ink-soft); }

.inputs-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 16px; box-shadow: var(--shadow);
}
.card > h2 {
  margin: 0 0 12px; font-size: 15px; color: var(--ink-soft);
  text-transform: uppercase; letter-spacing: 0.06em;
  cursor: pointer; user-select: none;
  display: flex; align-items: center; justify-content: space-between;
}
.card > h2:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
  border-radius: 6px;
}
.card > h2::after {
  content: "▾"; color: var(--muted); font-size: 12px;
  transition: transform .15s;
}
.card.collapsed > h2::after { transform: rotate(-90deg); }
.card.collapsed .grid { display: none; }

.grid {
  display: grid; gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}
.field { display: flex; flex-direction: column; gap: 4px; }
.field label { font-size: 13px; color: var(--ink-soft); }
.field input, .field select {
  appearance: none; border: 1px solid var(--border); background: #fbfcfd;
  padding: 10px 12px; border-radius: 10px; font-size: 16px;
  font-family: inherit; color: var(--ink);
  transition: border .15s, background .15s;
}
.field input:focus, .field select:focus {
  outline: 2px solid rgba(14, 124, 92, .15);
  outline-offset: 1px;
  border-color: var(--accent);
  background: #fff;
}
.field .hint { font-size: 12px; color: var(--muted); }

/* combobox */
.combobox { position: relative; }
.combobox input {
  width: 100%;
  padding-right: 36px;
}
.combobox-caret {
  position: absolute;
  top: 0;
  right: 0;
  height: 100%;
  width: 32px;
  display: flex; align-items: center; justify-content: center;
  background: transparent; border: 0;
  color: var(--muted);
  font-size: 12px;
  cursor: pointer;
  border-radius: 0 10px 10px 0;
}
.combobox-caret:hover { color: var(--ink-soft); }
.combobox.open .combobox-caret { transform: rotate(180deg); color: var(--accent); }
.combobox-list {
  position: absolute;
  top: calc(100% + 4px);
  left: 0; right: 0;
  margin: 0; padding: 4px;
  list-style: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 6px 24px rgba(15, 23, 34, 0.10), 0 2px 6px rgba(15, 23, 34, 0.06);
  z-index: 40;
  max-height: 240px;
  overflow-y: auto;
}
.combobox-list[hidden] { display: none; }
.combobox-list li {
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 14px;
  color: var(--ink);
  cursor: pointer;
  user-select: none;
}
.combobox-list li:hover,
.combobox-list li[aria-selected="true"] {
  background: var(--accent-soft);
  color: var(--accent-ink);
}
.combobox-list li.empty {
  color: var(--muted);
  cursor: default;
  background: transparent;
  font-style: italic;
}

.fuel-row { display: flex; gap: 8px; align-items: end; flex-wrap: wrap; }
.fuel-price-input {
  flex: 1;
  min-width: 120px;
}
.fuel-badge {
  font-size: 12px; color: var(--muted);
  padding: 4px 8px; background: var(--accent-soft); color: var(--accent-ink);
  border-radius: 6px;
}

/* results */
.kpi-group-title {
  margin: 18px 0 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.kpi-group-title:first-child { margin-top: 4px; }
.kpi-grid {
  display: grid; gap: 10px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.kpi {
  min-width: 0;
  padding: 14px; border-radius: 12px;
  background: linear-gradient(180deg, #ffffff 0%, #f7faf9 100%);
  border: 1px solid var(--border);
}
.kpi .label {
  font-size: 12px; color: var(--ink-soft); text-transform: uppercase;
  letter-spacing: 0.06em;
}
.kpi .value {
  font-size: 24px; font-weight: 700; margin-top: 4px; color: var(--accent-ink);
  overflow-wrap: anywhere;
  font-variant-numeric: tabular-nums;
}
.kpi.feature {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, #0e7c5c 0%, #14a37f 100%);
  border-color: transparent;
}
.kpi.feature .label { color: rgba(255,255,255,.85); }
.kpi.feature .value { color: #fff; font-size: 30px; }
.kpi.wide { grid-column: 1 / -1; }

.breakdown-title {
  margin: 18px 0 4px;
  font-size: 14px;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: .06em;
}

.breakdown { list-style: none; padding: 0; margin: 12px 0 0; }
.bar-row {
  display: grid; grid-template-columns: 130px 1fr 90px;
  gap: 10px; align-items: center; padding: 6px 0;
  font-size: 14px;
}
.bar-label { color: var(--ink-soft); }
.bar-track {
  height: 8px; background: #eef2f0; border-radius: 999px; overflow: hidden;
}
.bar-fill {
  display: block; height: 100%; background: var(--bar);
  border-radius: 999px;
  transition: width .25s ease;
}
.bar-value { text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; }

.actions { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }

.sales-note {
  margin-top: 16px;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}
.sales-note h3 {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.sales-note p {
  margin: 8px 0 0;
  color: var(--ink);
  background: #f7faf9;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
}

.print-only { display: none; }

/* sticky bottom strip (mobile) */
.sticky-strip {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 30;
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(8px);
  border-top: 1px solid var(--border);
  padding: 10px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.sticky-strip .label { font-size: 11px; color: var(--muted); text-transform: uppercase; }
.sticky-strip .value { font-size: 18px; font-weight: 700; color: var(--accent-ink); }
@media (min-width: 880px) { .sticky-strip { display: none; } }

/* print */
@media print {
  @page { size: letter; margin: 0.4in; }
  header.app, .sticky-strip, .actions, .card > h2::after,
  .card:not(.results-card), .hero p { display: none !important; }
  html, body {
    background: #fff; padding: 0; margin: 0;
    font-size: 11px;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
  main { display: block; padding: 0; margin: 0; }
  .hero { margin: 0 0 6px; }
  .hero h1 { font-size: 16px; margin: 0; }
  .results-col { position: static; }
  .results-card { box-shadow: none; border: none; padding: 0; }
  .print-only {
    display: block;
    margin: 0 0 6px;
    font-size: 10px;
    color: #4b5563;
  }
  .results-card h2 { font-size: 12px; margin: 0 0 6px; }
  .kpi-group-title { margin: 8px 0 4px; font-size: 10px; }
  .kpi-grid { gap: 6px; }
  .kpi { padding: 6px 8px; border-radius: 6px; break-inside: avoid; }
  .kpi .label { font-size: 9px; }
  .kpi .value { font-size: 14px; margin-top: 2px; }
  /* current + forecasted side-by-side, still highlighted */
  .kpi.feature {
    grid-column: auto;
    padding: 10px 12px;
    background: linear-gradient(135deg, #0e7c5c 0%, #14a37f 100%) !important;
    color: #fff !important;
    border: none;
  }
  .kpi.feature .label { color: rgba(255,255,255,.9) !important; font-size: 10px; }
  .kpi.feature .value { color: #fff !important; font-size: 20px; }
  /* breakdown: keep compact */
  .breakdown { margin: 6px 0; }
  .bar-row {
    grid-template-columns: 140px 1fr 70px;
    font-size: 10px; padding: 2px 0;
  }
  .bar-track { height: 6px; }
  /* sales note: keep, but tighten */
  .sales-note { margin-top: 8px; padding: 6px 8px; }
  .sales-note h3 { font-size: 10px; margin: 0 0 4px; }
  .sales-note p { font-size: 10px; margin: 2px 0; line-height: 1.35; }
}

/* small screens */
@media (max-width: 480px) {
  .bar-row { grid-template-columns: 110px 1fr 80px; font-size: 13px; }
  .hero h1 { font-size: 20px; }
}