:root {
  --bg: #f7f1e6;
  --bg-strong: #fffaf1;
  --surface: rgba(255, 250, 241, 0.86);
  --surface-strong: #fffaf1;
  --ink: #161a27;
  --muted: #596273;
  --line: rgba(22, 26, 39, 0.12);
  --shadow: 0 18px 50px rgba(22, 26, 39, 0.12);
  --orange: #ff6b2c;
  --orange-deep: #d94b14;
  --teal: #1da8a0;
  --lime: #31905f;
  --amber: #d59b22;
  --red: #d55257;
  --navy: #171c2d;
  --navy-soft: #212842;
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --page-width: 1200px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top right, rgba(29, 168, 160, 0.12), transparent 28%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.45), rgba(255, 255, 255, 0)),
    repeating-linear-gradient(
      90deg,
      rgba(22, 26, 39, 0.03) 0,
      rgba(22, 26, 39, 0.03) 1px,
      transparent 1px,
      transparent 36px
    ),
    var(--bg);
}

button, input, select, textarea { font: inherit; }
button { cursor: pointer; }

/* ── Hero ── */
.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(260px, 0.75fr);
  gap: 2rem;
  align-items: end;
  overflow: clip;
  padding: 3rem clamp(1.25rem, 4vw, 3rem) 2.75rem;
  color: #f7f0e2;
  background:
    radial-gradient(circle at 82% 20%, rgba(255, 107, 44, 0.34), transparent 18%),
    radial-gradient(circle at 92% 76%, rgba(29, 168, 160, 0.24), transparent 18%),
    linear-gradient(135deg, #181d30 0%, #111626 56%, #222b45 100%);
}

.hero__noise {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.7), transparent);
  pointer-events: none;
}

.hero__copy, .hero__visual { position: relative; z-index: 1; }

.hero__brand,
.hero__eyebrow,
.panel__eyebrow,
.inspector__eyebrow {
  margin: 0 0 0.8rem;
  letter-spacing: 0.16em;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  opacity: 0.65;
}

.hero__brand { opacity: 0.5; }

.hero__copy h1 {
  margin: 0 0 0.9rem;
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hero__lede {
  margin: 0 0 1.4rem;
  font-size: 1rem;
  line-height: 1.6;
  opacity: 0.8;
  max-width: 48ch;
}

.hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.hero__chips span {
  padding: 0.3rem 0.75rem;
  border-radius: 99px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.15);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

/* ── Hero mode toggle ── */
.hero__mode-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0;
  margin-bottom: 1.5rem;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 99px;
  padding: 3px;
}

.mode-btn {
  padding: 0.45rem 1.1rem;
  border: none;
  border-radius: 99px;
  background: transparent;
  color: rgba(255,255,255,0.65);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  transition: background 0.18s, color 0.18s;
}

.mode-btn.active {
  background: var(--orange);
  color: #fff;
}

/* ── Hero visual: receipt preview ── */
.hero__visual {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  padding-bottom: 0.5rem;
}

.receipt-preview {
  width: 100%;
  max-width: 260px;
  background: rgba(255,250,241,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.2rem;
  backdrop-filter: blur(8px);
}

.receipt-preview__title {
  margin: 0 0 0.9rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.5;
}

.receipt-bar {
  display: flex;
  height: 10px;
  border-radius: 99px;
  overflow: hidden;
  margin-bottom: 0.85rem;
  gap: 2px;
}

.receipt-bar__seg {
  border-radius: 99px;
  transition: flex 0.4s cubic-bezier(0.34,1.56,0.64,1);
}

.receipt-bar__seg--mat   { background: var(--orange); flex: 4; }
.receipt-bar__seg--elec  { background: var(--teal);   flex: 1; }
.receipt-bar__seg--time  { background: var(--lime);   flex: 2; }
.receipt-bar__seg--other { background: var(--amber);  flex: 1; }

.receipt-legend {
  display: grid;
  gap: 0.45rem;
}

.receipt-legend__row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
  opacity: 0.8;
}

.receipt-legend__dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  margin-right: 0.45rem;
  flex-shrink: 0;
}

.receipt-legend__label { display: flex; align-items: center; }
.receipt-legend__val { font-weight: 700; font-variant-numeric: tabular-nums; }

.receipt-preview__total {
  margin-top: 0.9rem;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(255,255,255,0.15);
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  font-weight: 700;
}

/* ── Workspace ── */
.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 1.5rem;
  width: min(calc(100% - 2.5rem), var(--page-width));
  margin: -1.5rem auto 0;
  padding-bottom: 3rem;
}

.builder {
  border: 1px solid var(--line);
  background: var(--surface);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.inspector {
  position: sticky;
  top: 1rem;
  align-self: start;
  border: 1px solid var(--line);
  background: var(--surface);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

/* ── Panels ── */
.panel {
  padding: 1.5rem;
}

.panel + .panel {
  border-top: 1px solid var(--line);
}

.panel__header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.panel__header h2 {
  margin: 0;
  font-size: 1.4rem;
  line-height: 1.1;
  font-weight: 800;
}

.panel--advanced .panel__eyebrow {
  color: var(--teal);
  opacity: 1;
}

/* ── Field grid ── */
.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.field-grid--triple { grid-template-columns: 1fr 1fr 1fr; }
.field-grid--single { grid-template-columns: 1fr; }

.field {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.field span {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-transform: uppercase;
}

.field small {
  font-size: 0.75rem;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  opacity: 0.7;
}

.field input[type="number"],
.field input[type="text"],
.field select {
  padding: 0.6rem 0.75rem;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg-strong);
  color: var(--ink);
  font-size: 1rem;
  transition: border-color 0.15s;
  -moz-appearance: textfield;
}

.field input[type="number"]::-webkit-outer-spin-button,
.field input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }

.field input:focus, .field select:focus {
  outline: none;
  border-color: var(--orange);
}

.field--range { grid-column: span 2; }

.range-field {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.range-field input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 99px;
  background: var(--line);
  outline: none;
  border: none;
  padding: 0;
}

.range-field input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--orange);
  border: 3px solid #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
  cursor: pointer;
}

.range-field input[type="range"]::-moz-range-thumb {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--orange);
  border: 3px solid #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
  cursor: pointer;
}

.range-field output {
  min-width: 3.5rem;
  text-align: right;
  font-size: 0.95rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--orange);
}

/* ── Inspector / Results ── */
.inspector__section {
  padding: 1.25rem 1.4rem;
}

.inspector__section + .inspector__section {
  border-top: 1px solid var(--line);
}

.inspector__header {
  margin-bottom: 1rem;
}

.inspector__header h2 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 800;
}

/* ── Breakdown bar ── */
.breakdown-bar {
  display: flex;
  height: 12px;
  border-radius: 99px;
  overflow: hidden;
  gap: 2px;
  margin: 0.6rem 0 0.9rem;
}

.breakdown-bar__seg {
  border-radius: 99px;
  transition: flex 0.4s cubic-bezier(0.34,1.56,0.64,1);
  min-width: 0;
}

.breakdown-bar__seg--mat   { background: var(--orange); }
.breakdown-bar__seg--elec  { background: var(--teal); }
.breakdown-bar__seg--time  { background: var(--lime); }
.breakdown-bar__seg--other { background: var(--amber); }
.breakdown-bar__seg--empty { background: var(--line); flex: 1; }

.breakdown-legend {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.breakdown-legend__row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
}

.breakdown-legend__label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
}

.breakdown-legend__dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}

.breakdown-legend__val {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

/* ── Price cards ── */
.price-cards {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.6rem;
  margin-bottom: 0.25rem;
}

.price-card {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.85rem 0.7rem;
  border-radius: var(--radius-md);
  background: var(--bg-strong);
  border: 1.5px solid var(--line);
  text-align: center;
  transition: border-color 0.2s, background 0.2s;
}

.price-card--highlight {
  border-color: var(--orange);
  background: rgba(255,107,44,0.06);
}

.price-card__label {
  margin: 0;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.price-card--highlight .price-card__label { color: var(--orange-deep); }

.price-card__value {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  line-height: 1.1;
}

.price-card--highlight .price-card__value { color: var(--orange-deep); }

.price-card__desc {
  margin: 0;
  font-size: 0.67rem;
  color: var(--muted);
  line-height: 1.3;
}

/* ── Explainer / tip ── */
.explainer {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  background: rgba(29,168,160,0.07);
  border: 1px solid rgba(29,168,160,0.2);
}

.explainer p {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--ink);
}

.explainer strong { color: var(--teal); }

/* ── Empty state ── */
.empty-state {
  display: grid;
  gap: 0.5rem;
  padding: 1rem 0 0.5rem;
  text-align: center;
}

.empty-state p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

/* ── Workspace mode toggle bar ── */
.mode-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.5rem;
  background: var(--navy-soft);
  color: #f7f0e2;
}

.mode-bar__label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.7;
}

.mode-bar__toggle {
  display: inline-flex;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 99px;
  padding: 3px;
  gap: 0;
}

.mode-bar__btn {
  padding: 0.35rem 0.9rem;
  border: none;
  border-radius: 99px;
  background: transparent;
  color: rgba(255,255,255,0.6);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  transition: background 0.18s, color 0.18s;
}

.mode-bar__btn.active {
  background: var(--orange);
  color: #fff;
}

/* ── Responsive ── */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
  }
  .hero__visual { display: none; }
  .workspace {
    grid-template-columns: 1fr;
    margin-top: -1rem;
  }
  .inspector {
    position: static;
  }
  .field-grid { grid-template-columns: 1fr; }
  .field-grid--triple { grid-template-columns: 1fr 1fr; }
  .field--range { grid-column: span 1; }
  .price-cards { grid-template-columns: 1fr; gap: 0.5rem; }
}

@media (max-width: 480px) {
  .hero { padding: 2rem 1.25rem 2.25rem; }
  .field-grid--triple { grid-template-columns: 1fr; }
  .price-cards { grid-template-columns: 1fr 1fr; }
}