:root {
  --bg: #101317;
  --bg-card: #171b21;
  --bg-elev: #1e232a;
  --border: #2b323b;
  --border-soft: #232931;
  --text: #e7eaee;
  --text-dim: #96a0ac;
  --accent: #4ecdc4;
  --accent-ink: #06231f;
  --accent-2: #7aa2f7;
  --good: #46c98b;
  --good-bg: #14302a;
  --bad: #e2807a;
  --warn: #e8b168;
  --shadow: 0 1px 2px rgba(0,0,0,.30);
  --radius: 10px;
  font-synthesis: none;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f7f8;
    --bg-card: #ffffff;
    --bg-elev: #eef1f4;
    --border: #dbe1e7;
    --border-soft: #e7ebef;
    --text: #1b2027;
    --text-dim: #5c6773;
    --accent: #0a7a6f;
    --accent-ink: #ffffff;
    --accent-2: #4667c4;
    --good: #177a52;
    --good-bg: #e6f4ed;
    --bad: #c0554e;
    --warn: #9a5c07;
    --shadow: 0 1px 2px rgba(20,40,70,.07);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 1000px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  background: linear-gradient(135deg, rgba(255,183,3,.12), rgba(78,168,222,.10));
  border-bottom: 1px solid var(--border);
  padding: 44px 0 34px;
}
.site-header h1 { margin: 0 0 6px; font-size: 2rem; letter-spacing: -.5px; }
.tagline { margin: 0 0 10px; font-size: 1.1rem; color: var(--text); max-width: 640px; }
.privacy { margin: 0; font-size: .9rem; color: var(--text-dim); }

/* Cards */
main.wrap { padding-top: 28px; padding-bottom: 60px; }
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 26px 26px 30px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}
.card h2 { margin: 0 0 18px; font-size: 1.35rem; display: flex; align-items: center; gap: 12px; }
.step {
  display: inline-grid; place-items: center;
  width: 26px; height: 26px; border-radius: 7px;
  background: transparent; border: 1px solid var(--border);
  color: var(--text-dim); font-weight: 600; font-size: .85rem;
  font-variant-numeric: tabular-nums;
}
.section-intro, .chart-note { color: var(--text-dim); font-size: .92rem; }
.section-intro { margin: -6px 0 18px; }

/* Dropzone */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 42px 20px;
  text-align: center;
  transition: border-color .2s, background .2s;
  cursor: pointer;
}
.dropzone.drag { border-color: var(--accent); background: rgba(255,183,3,.06); }
.dz-main { font-size: 1.15rem; margin: 0 0 4px; font-weight: 600; }
.dz-sub { margin: 0 0 14px; color: var(--text-dim); }
.dz-hint { margin: 0; font-size: .85rem; color: var(--text-dim); }
.link-btn {
  background: none; border: none; color: var(--accent-2);
  cursor: pointer; font: inherit; text-decoration: underline; padding: 0;
}

.status { margin-top: 16px; padding: 12px 16px; border-radius: 10px; font-size: .92rem; }
.status.ok { background: var(--good-bg); color: var(--good); border: 1px solid var(--good); }
.status.err { background: rgba(224,122,95,.12); color: var(--bad); border: 1px solid var(--bad); }
.status.info { background: var(--bg-elev); color: var(--text-dim); border: 1px solid var(--border); }

/* Stats */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; margin-bottom: 26px; }
.stat {
  background: var(--bg-elev); border: 1px solid var(--border-soft);
  border-radius: 8px; padding: 14px 16px;
}
.stat .num { font-size: 1.5rem; font-weight: 700; letter-spacing: -.5px; }
.stat .lbl { font-size: .82rem; color: var(--text-dim); margin-top: 2px; }

/* Charts */
.chart-row { margin-top: 22px; }
.chart-row.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 720px) { .chart-row.two-col { grid-template-columns: 1fr; } }
.chart-box h3 { margin: 0 0 4px; font-size: 1.05rem; }
.chart-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
.inline-select { font-size: .85rem; color: var(--text-dim); display: flex; flex-direction: column; gap: 4px; }
.inline-select select {
  background: var(--bg-card); border: 1px solid var(--border); color: var(--text);
  border-radius: 8px; padding: 7px 10px; font: inherit; min-width: 160px;
}
.chart-note { margin: 0 0 14px; }
canvas { max-width: 100%; }

/* Heatmap */
#heatmap { display: grid; grid-template-columns: 42px repeat(24, 1fr); gap: 2px; font-size: .62rem; overflow-x: auto; }
.hm-cell { aspect-ratio: 1 / 1; border-radius: 2px; min-width: 12px; }
.hm-label { color: var(--text-dim); display: flex; align-items: center; }
.hm-hour { color: var(--text-dim); text-align: center; }
.heatmap-legend { display: flex; align-items: center; gap: 8px; margin-top: 10px; font-size: .78rem; color: var(--text-dim); }
#heatmap-scale { flex: 0 0 160px; height: 12px; border-radius: 6px;
  background: linear-gradient(90deg, var(--bg-elev), var(--accent)); }

/* Plans */
.plan {
  background: var(--bg-elev); border: 1px solid var(--border-soft);
  border-radius: 8px; padding: 18px; margin-bottom: 14px;
}
/* Automatic picks read as suggestions until the user edits one. */
.plan.is-recommended {
  border-color: var(--accent);
  box-shadow: inset 3px 0 0 var(--accent);
}
.plan-head { display: flex; gap: 12px; align-items: center; margin-bottom: 16px; }
.plan-name {
  flex: 1; font-size: 1.1rem; font-weight: 600;
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text); border-radius: 8px; padding: 8px 12px;
}
.remove-plan {
  background: none; border: 1px solid var(--border); color: var(--text-dim);
  width: 34px; height: 34px; border-radius: 8px; cursor: pointer; font-size: 1rem;
}
.remove-plan:hover { color: var(--bad); border-color: var(--bad); }

.field-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 14px; margin-bottom: 16px; }
.field { display: flex; flex-direction: column; gap: 5px; font-size: .88rem; }
.field span { color: var(--text-dim); }
.field small { color: var(--text-dim); font-size: .74rem; }
.field input, .flat-block input {
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text); border-radius: 8px; padding: 8px 10px; font: inherit;
}
input[type="number"] { -moz-appearance: textfield; }

.rate-mode { display: flex; gap: 20px; margin-bottom: 14px; font-size: .92rem; }
.rate-mode label { display: flex; align-items: center; gap: 6px; cursor: pointer; }

.flat-block .field { max-width: 260px; }

/* TOU table */
.tou-block { margin-top: 6px; }
.tou-table { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: .84rem; }
.tou-table th { text-align: left; color: var(--text-dim); font-weight: 500; padding: 4px 6px; font-size: .78rem; }
.tou-table td { padding: 4px 6px; vertical-align: top; }
.tou-table input[type="text"], .tou-table input[type="number"], .tou-table input[type="time"] {
  width: 100%; background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text); border-radius: 6px; padding: 6px 8px; font: inherit;
}
.tou-table .w-rate { max-width: 90px; }
.day-picker { display: flex; gap: 2px; }
.day-picker label {
  display: flex; flex-direction: column; align-items: center; font-size: .6rem;
  color: var(--text-dim); cursor: pointer; user-select: none;
}
.day-picker input { margin: 0; }
.remove-window {
  background: none; border: 1px solid var(--border); color: var(--text-dim);
  border-radius: 6px; cursor: pointer; padding: 4px 8px;
}
.remove-window:hover { color: var(--bad); border-color: var(--bad); }

/* Buttons */
.btn {
  background: var(--accent); color: #1a1200; border: none;
  border-radius: 9px; padding: 10px 18px; font: inherit; font-weight: 600;
  cursor: pointer; transition: transform .05s, filter .15s;
}
.btn:hover { filter: brightness(1.05); }
.btn:active { transform: translateY(1px); }
.btn-small { padding: 6px 12px; font-size: .85rem; }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--accent); }
.btn-danger { color: var(--bad); }
.plan-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 6px; }
.saved-note { color: var(--text-dim); font-size: .82rem; margin: 12px 0 0; }

/* Catalogue plan picker */
.catalog-picker {
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 12px; padding: 16px 18px; margin-bottom: 18px;
}
.catalog-picker h3 { margin: 0 0 4px; font-size: 1.05rem; }
.catalog-picker .chart-note { margin: 0 0 14px; }
.picker-row { display: grid; grid-template-columns: 1.1fr 0.6fr 1.1fr 1.5fr auto; gap: 12px; align-items: end; }
.picker-row .field { margin: 0; }
.picker-row select, .picker-row input {
  background: var(--bg-card); border: 1px solid var(--border); color: var(--text);
  border-radius: 8px; padding: 8px 10px; font: inherit; width: 100%;
}
.picker-row .btn { white-space: nowrap; }
#catalog-meta { color: var(--text-dim); }
.nmi-note {
  margin: 0 0 14px; padding: 9px 12px; font-size: .86rem;
  background: rgba(78,168,222,.12); border: 1px solid var(--accent-2);
  border-radius: 8px; color: var(--text);
}
@media (max-width: 720px) { .picker-row { grid-template-columns: 1fr 1fr; } .picker-row .picker-plan, .picker-row .btn { grid-column: 1 / -1; } }

/* Load-shifting / optimise */
.opt-controls { margin-bottom: 18px; }
.opt-controls .field { max-width: 320px; }
.opt-controls select {
  background: var(--bg-card); border: 1px solid var(--border); color: var(--text);
  border-radius: 8px; padding: 8px 10px; font: inherit;
}
.opt-summary { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; margin-bottom: 22px; }
.opt-summary .stat { background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.opt-summary .num { font-size: 1.4rem; font-weight: 700; letter-spacing: -.5px; }
.opt-summary .num.accent { color: var(--good); }
.opt-summary .lbl { font-size: .82rem; color: var(--text-dim); margin-top: 2px; }
.opt-summary.none { display: block; color: var(--text-dim); background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }

.opt-slider-wrap {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px;
  padding: 18px 20px; margin-bottom: 8px;
}
.opt-slider-wrap label { display: block; margin-bottom: 12px; font-size: .95rem; }
.opt-slider-wrap output { font-weight: 700; color: var(--accent); }
.opt-slider-wrap input[type="range"] { width: 100%; accent-color: var(--good); }
.opt-result { margin-top: 16px; font-size: 1.05rem; }
.opt-result .big { font-size: 1.5rem; font-weight: 700; color: var(--good); }
.opt-result .from { color: var(--text-dim); text-decoration: line-through; }

.opt-tips { margin-top: 22px; }
.opt-tips h3 { margin: 0 0 10px; font-size: 1.05rem; }
.opt-tips ul { margin: 0; padding-left: 20px; color: var(--text-dim); }
.opt-tips li { margin-bottom: 6px; }
.opt-tips strong { color: var(--text); }

/* Verdict */
.verdict {
  background: var(--good-bg);
  border: 1px solid var(--border-soft);
  border-left: 3px solid var(--good);
  border-radius: 8px; padding: 16px 20px; margin-bottom: 22px;
  color: var(--text);
}
.verdict.none {
  background: var(--bg-elev); border-left-color: var(--border);
  color: var(--text-dim);
}
.verdict.none p { color: var(--text-dim); }
.verdict h3 { margin: 0 0 6px; color: var(--good); font-size: 1.15rem; }
.verdict p { margin: 0; color: var(--text); }
.verdict .save { font-weight: 700; color: var(--good); }

/* Results table */
.table-wrap { overflow-x: auto; margin-top: 22px; }
table.results { width: 100%; border-collapse: collapse; font-size: .9rem; }
table.results th, table.results td { padding: 10px 12px; text-align: right; border-bottom: 1px solid var(--border); }
table.results th:first-child, table.results td:first-child { text-align: left; }
table.results thead th { color: var(--text-dim); font-weight: 500; font-size: .82rem; }
table.results tr.winner { background: var(--good-bg); }
table.results tr.winner td { color: #e9f7ef; }
table.results tr.winner td strong { color: #fff; }
table.results tr.winner td:first-child::before {
  content: "Cheapest"; display: inline-block; margin-right: 8px;
  background: var(--good); color: #06210f; font-size: .62rem; font-weight: 700;
  letter-spacing: .04em; text-transform: uppercase; padding: 2px 6px; border-radius: 4px;
  vertical-align: middle;
}

.disclaimer { color: var(--text-dim); font-size: .8rem; margin-top: 18px; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 24px 0; color: var(--text-dim); font-size: .85rem; }
.site-footer a { color: var(--accent-2); }

@media (max-width: 560px) {
  .site-header h1 { font-size: 1.6rem; }
  .card { padding: 20px 16px 24px; }
  #heatmap { font-size: .5rem; }
}

/* Feed-in note, emphasised when the plan's real rate varies by time of day. */
.p-feedin-note.note-varying {
  color: var(--warn);
}

/* Automatic recommendation: badge on the card, note above the list. */
.plan-badge {
  flex: 0 0 auto;
  font-size: .7rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  color: var(--accent-ink); background: var(--accent);
  border-radius: 5px; padding: 4px 8px;
}
.recommend-note {
  margin: 0 0 16px;
  font-size: .88rem; line-height: 1.5; color: var(--text-dim);
  background: var(--bg-elev);
  border: 1px solid var(--border-soft);
  border-left: 3px solid var(--accent);
  border-radius: 8px; padding: 12px 14px;
}
.recommend-note strong { color: var(--text); }

/* Link out to the official plan page, and the "I'm on this" marker. */
.plan-link {
  flex: 0 0 auto;
  font-size: .8rem; color: var(--accent); text-decoration: none;
  border: 1px solid var(--border); border-radius: 6px; padding: 6px 10px;
  white-space: nowrap;
}
.plan-link:hover { border-color: var(--accent); }
.plan-current {
  flex: 0 0 auto; display: flex; align-items: center; gap: 6px;
  font-size: .8rem; color: var(--text-dim); white-space: nowrap; cursor: pointer;
}
.plan-current input { accent-color: var(--accent); }
.row-link { color: var(--accent); font-size: .82rem; white-space: nowrap; }
.row-tag {
  font-size: .68rem; text-transform: uppercase; letter-spacing: .04em;
  border: 1px solid var(--border); border-radius: 4px;
  padding: 2px 5px; color: var(--text-dim);
}
tr.is-current td { border-top: 1px solid var(--accent); border-bottom: 1px solid var(--accent); }

.catalog-error {
  margin: 0 0 16px;
  font-size: .88rem; line-height: 1.5; color: var(--text);
  background: var(--bg-elev);
  border: 1px solid var(--border-soft);
  border-left: 3px solid var(--bad);
  border-radius: 8px; padding: 12px 14px;
}

@media (max-width: 560px) {
  .plan-head { flex-wrap: wrap; }
  .plan-name { flex: 1 1 100%; order: -1; }
}

/* Print: the comparison is what people take away, so drop the input chrome
   and let the tables and charts fall onto the page. */
@media print {
  :root {
    --bg: #fff; --bg-card: #fff; --bg-elev: #fff;
    --text: #000; --text-dim: #333;
    --border: #999; --border-soft: #ccc; --shadow: none;
  }
  body { background: #fff; color: #000; }
  .card { border: 1px solid #ccc; box-shadow: none; break-inside: avoid; margin-bottom: 12px; }
  /* Inputs, actions and the pickers are for working, not for reading. */
  #step-upload, .plan-actions, .picker-row, .catalog-picker,
  .saved-note, .remove-plan, .plan-current, #opt-controls,
  .recommend-note, .catalog-error { display: none !important; }
  .chart-row.two-col { grid-template-columns: 1fr 1fr; }
  canvas { max-width: 100% !important; height: auto !important; break-inside: avoid; }
  table.results { font-size: 10pt; width: 100%; }
  .verdict { border: 1px solid #666; break-inside: avoid; }
  .plan-link, .row-link { color: #000; text-decoration: underline; }
  /* Show where a link actually goes, since a printed page cannot be clicked. */
  .plan-link::after, .row-link::after { content: " (" attr(href) ")"; font-size: 8pt; word-break: break-all; }
  a[href^="#"]::after { content: ""; }
  section { break-inside: avoid-page; }
}

/* Auto / manual mode switch in the header. */
.mode-switch {
  display: inline-flex; gap: 4px; margin-top: 14px;
  background: var(--bg-elev); border: 1px solid var(--border-soft);
  border-radius: 10px; padding: 4px;
}
.mode-btn {
  display: flex; flex-direction: column; gap: 2px; align-items: flex-start;
  background: transparent; border: 1px solid transparent; border-radius: 7px;
  padding: 8px 14px; cursor: pointer; color: var(--text-dim);
  font: inherit; text-align: left;
}
.mode-btn:hover { color: var(--text); }
.mode-btn.is-active {
  background: var(--bg-card); border-color: var(--border);
  color: var(--text);
}
.mode-btn.is-active .mode-name { color: var(--accent); }
.mode-name { font-weight: 600; font-size: .95rem; }
.mode-desc { font-size: .75rem; color: var(--text-dim); }

.manual-note {
  margin: 0 0 18px;
  font-size: .88rem; line-height: 1.5; color: var(--text-dim);
  background: var(--bg-elev);
  border: 1px solid var(--border-soft);
  border-left: 3px solid var(--accent);
  border-radius: 8px; padding: 12px 14px;
}
.manual-note strong { color: var(--text); }

@media (max-width: 560px) {
  .mode-switch { width: 100%; }
  .mode-btn { flex: 1; }
}
@media print { .mode-switch, .manual-note { display: none !important; } }