/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Design tokens ── */
:root {
  --bg:          #121417;
  --surface:     #1b1e24;
  --surface-alt: #22262e;
  --border:      #2c3038;
  --border-warm: #3a3229;
  --text:        #e4e5e9;
  --text-muted:  #878c99;
  --blue:        #4da6e8;
  --blue-dim:    #2980b9;
  --blue-glow:   rgba(77,166,232,0.10);
  --amber:       #e8a838;
  --amber-dim:   #c78820;
  --amber-glow:  rgba(232, 168, 56, 0.10);
  --ember:       #d45a20;
  --ember-glow:  rgba(212, 90, 32, 0.08);
  --radius:      14px;
  --radius-sm:   8px;
  --shadow:      0 2px 24px rgba(0,0,0,.35);
}

html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ── Site Nav ── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(18, 20, 23, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-nav .nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.site-nav .nav-logo img { height: 22px; display: block; }
.site-nav .nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}
.site-nav .nav-links a {
  display: block;
  padding: 6px 14px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
}
.site-nav .nav-links a:hover { color: var(--text); background: rgba(255,255,255,0.04); }
.site-nav .nav-links a.active { color: var(--text); background: rgba(255,255,255,0.06); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-muted);
  border-radius: 2px;
}

@media (max-width: 700px) {
  .nav-toggle { display: flex; }
  .site-nav .nav-links {
    display: none;
    position: absolute;
    top: 56px;
    left: 0; right: 0;
    flex-direction: column;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px;
    gap: 2px;
  }
  .site-nav .nav-links.open { display: flex; }
  .site-nav .nav-links a { padding: 10px 14px; font-size: 0.9rem; }
}

/* ── Header ── */
.wc-header {
  position: relative;
  overflow: hidden;
  padding: 48px 0 40px;
  text-align: center;
  background: linear-gradient(180deg, #1b2230 0%, var(--bg) 100%);
  border-bottom: 1px solid var(--border);
}
.wc-header h1 {
  font-family: 'Poppins', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text);
  line-height: 1.2;
}
.wc-sub {
  color: var(--text-muted);
  margin-top: 8px;
  font-size: 0.95rem;
}

/* ── Cards ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 40px;
  margin: 28px 0;
  box-shadow: var(--shadow);
  position: relative;
}
.card h2 {
  font-family: 'Poppins', sans-serif;
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.3;
}
.card-desc {
  color: var(--text-muted);
  margin-top: 4px;
  font-size: 0.9rem;
  line-height: 1.5;
}
.step-row {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 28px;
}
.step-num {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.95rem;
  color: #fff;
  background: #2980b9;
  box-shadow: 0 0 18px rgba(41,128,185,0.15), 0 0 0 4px rgba(41,128,185,0.08);
  line-height: 1;
}

/* ── Forms ── */
.form-row { display: flex; gap: 20px; flex-wrap: wrap; }
.form-group { flex: 1; min-width: 180px; margin-bottom: 8px; }
.form-group label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}
select, input[type="number"], input[type="text"] {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  appearance: none;
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s;
}
select:hover, input[type="number"]:hover, input[type="text"]:hover { border-color: #3e4452; }
select:focus, input[type="number"]:focus, input[type="text"]:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px var(--blue-glow);
}
select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23878c99' stroke-width='2' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

/* Search with autocomplete */
.search-wrapper { position: relative; }
.search-wrapper input { padding-right: 40px; }
.search-icon {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  font-size: 0.9rem;
}
.autocomplete-list {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  max-height: 220px;
  overflow-y: auto;
  z-index: 100;
  display: none;
  box-shadow: 0 6px 16px rgba(0,0,0,0.3);
}
.autocomplete-list.active { display: block; }
.autocomplete-item {
  padding: 10px 14px;
  cursor: pointer;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.15s;
  color: var(--text);
}
.autocomplete-item:last-child { border-bottom: none; }
.autocomplete-item:hover,
.autocomplete-item.highlighted { background: rgba(77,166,232,0.08); }
.ppm-badge {
  background: rgba(77,166,232,0.12);
  color: var(--blue);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
}
.autocomplete-item:hover .ppm-badge,
.autocomplete-item.highlighted .ppm-badge {
  background: #2980b9;
  color: #fff;
}

/* City name display */
.city-name-display {
  display: none;
  margin-top: 10px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  background: rgba(77,166,232,0.06);
  border: 1px solid rgba(77,166,232,0.15);
  color: var(--blue);
  font-size: 0.85rem;
  font-weight: 500;
  align-items: center;
  gap: 8px;
}
.city-name-display.active { display: flex; }

/* Or divider */
.or-divider {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.78rem;
  margin: 14px 0;
  display: flex;
  align-items: center;
  gap: 10px;
}
.or-divider::before, .or-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* Hardness display */
.water-hardness-display {
  display: none;
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.water-hardness-display.active { display: flex; }
.water-hardness-display.soft { background: rgba(46,204,113,0.1); color: #2ecc71; border: 1px solid rgba(46,204,113,0.2); }
.water-hardness-display.moderate { background: rgba(241,196,15,0.1); color: #f1c40f; border: 1px solid rgba(241,196,15,0.2); }
.water-hardness-display.hard { background: rgba(230,126,34,0.1); color: #e67e22; border: 1px solid rgba(230,126,34,0.2); }
.water-hardness-display.very-hard { background: rgba(231,76,60,0.1); color: #e74c3c; border: 1px solid rgba(231,76,60,0.2); }

/* Hardness scale bar */
.hardness-scale { margin-top: 16px; }
.hardness-scale-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}
.hardness-bar {
  position: relative;
  display: flex;
  border-radius: 6px;
  overflow: hidden;
  height: 24px;
}
.hardness-bar-segment {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 600;
  white-space: nowrap;
  line-height: 1;
  flex: 1;
}
.seg-soft { background: rgba(46,204,113,0.25); color: #2ecc71; }
.seg-moderate { background: rgba(241,196,15,0.25); color: #f1c40f; }
.seg-hard { background: rgba(230,126,34,0.25); color: #e67e22; }
.seg-vhard { background: rgba(231,76,60,0.25); color: #e74c3c; }
.hardness-bar-labels {
  display: flex;
  margin-top: 4px;
  font-size: 0.62rem;
  color: var(--text-muted);
}
.hardness-bar-labels span { flex: 1; text-align: center; }
.hardness-scale-marker {
  position: absolute;
  top: -3px;
  bottom: -3px;
  width: 3px;
  background: var(--text);
  border-radius: 2px;
  transform: translateX(-50%);
  box-shadow: 0 0 0 2px var(--surface), 0 0 6px rgba(0,0,0,0.4);
  transition: left 0.4s ease;
  display: none;
  z-index: 2;
}
.hardness-scale-marker.active { display: block; }
.data-source {
  text-align: center;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  line-height: 1.4;
}
.data-source a { color: var(--blue); text-decoration: none; }
.data-source a:hover { text-decoration: underline; }

/* Map + Hardness two-column layout */
.water-hardness-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

/* Tile Map */
.tile-map-wrapper { position: relative; }
.tile-map {
  display: grid;
  grid-template-columns: repeat(26, 1fr);
  grid-template-rows: repeat(18, 1fr);
  gap: 1.5px;
  max-width: 100%;
}
.silhouette-tile {
  aspect-ratio: 1;
  background: rgba(77,166,232,0.04);
  border-radius: 2px;
  border: 1px solid rgba(77,166,232,0.06);
}
.state-tile {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 2px;
  font-size: 0.4rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  letter-spacing: 0.1px;
  position: relative;
  line-height: 1;
}
.state-tile:hover {
  transform: scale(1.15);
  z-index: 2;
  box-shadow: 0 1px 4px rgba(0,0,0,0.3);
}
.state-tile.active {
  box-shadow: 0 0 0 1.5px var(--surface), 0 0 0 2.5px var(--blue);
  transform: scale(1.1);
  z-index: 3;
  animation: tilePulse 2s ease-in-out infinite;
}
@keyframes tilePulse {
  0%, 100% { box-shadow: 0 0 0 1.5px var(--surface), 0 0 0 2.5px var(--blue); }
  50% { box-shadow: 0 0 0 1.5px var(--surface), 0 0 0 2.5px var(--blue), 0 0 8px rgba(77,166,232,0.4); }
}
.map-legend {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 10px;
  flex-wrap: wrap;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 500;
}
.legend-color {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex-shrink: 0;
}
.map-city-label {
  text-align: center;
  margin-top: 10px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--blue);
  min-height: 1.3em;
}
.map-panel-title {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 12px;
}

/* Sliders */
.slider-row { display: flex; align-items: center; gap: 14px; }
input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  height: 5px;
  border-radius: 3px;
  background: var(--border);
  outline: none;
  transition: background 0.15s;
}
input[type="range"]:hover { background: #3a3e48; }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--blue);
  cursor: grab;
  box-shadow: 0 1px 6px rgba(0,0,0,.4), 0 0 12px rgba(77,166,232,0.15);
  transition: transform 0.12s, box-shadow 0.12s;
  border: 2px solid rgba(255,255,255,0.12);
}
input[type="range"]::-webkit-slider-thumb:hover {
  box-shadow: 0 1px 6px rgba(0,0,0,.4), 0 0 20px rgba(77,166,232,0.25);
}
input[type="range"]::-webkit-slider-thumb:active { cursor: grabbing; transform: scale(1.12); }
input[type="range"]::-moz-range-thumb {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--blue);
  cursor: grab;
  border: 2px solid rgba(255,255,255,0.12);
}
.slider-value {
  min-width: 64px;
  text-align: right;
  font-weight: 700;
  font-size: 1rem;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}
.hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 6px;
  line-height: 1.45;
}

/* Fireplace config rows */
.fireplace-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 12px;
  padding: 14px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.fireplace-row .form-group { margin-bottom: 0; min-width: 0; }
.fireplace-row .fp-softener-group { grid-column: 1 / -1; }
.fireplace-row .fp-per-label {
  grid-column: 1 / -1;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  text-align: center;
  margin: 2px 0 -2px;
}
.fireplace-row .remove-btn {
  padding: 10px 12px;
  background: rgba(231,76,60,0.08);
  color: #e74c3c;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  transition: background 0.2s;
  flex-shrink: 0;
}
.fireplace-row .remove-btn:hover { background: rgba(231,76,60,0.18); }
.add-fireplace-btn {
  background: none;
  border: 1.5px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 10px;
  color: var(--blue);
  font-size: 0.85rem;
  cursor: pointer;
  width: 100%;
  transition: all 0.2s;
  font-weight: 500;
  margin-top: 4px;
}
.add-fireplace-btn:hover {
  border-color: var(--blue);
  background: rgba(77,166,232,0.04);
}
.total-segments {
  margin-top: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.total-segments strong { color: var(--blue); }

/* Result card */
.result-card {
  margin-top: 24px;
  padding: 22px 24px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--blue);
  background: linear-gradient(135deg, rgba(77,166,232,0.06) 0%, rgba(41,128,185,0.04) 100%);
  position: relative;
  overflow: hidden;
  text-align: center;
}
.result-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), #2980b9);
}
.result-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}
.result-value {
  display: block;
  font-family: 'Poppins', sans-serif;
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--blue);
  margin: 6px 0 2px;
  line-height: 1.1;
}
.result-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}
.result-unit {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* Result breakdown */
.result-breakdown {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  text-align: left;
  font-size: 0.82rem;
  line-height: 1.7;
  margin-top: 12px;
}
.result-breakdown .row {
  display: flex;
  justify-content: space-between;
}
.result-breakdown .row .label { color: var(--text-muted); }
.result-breakdown .divider {
  border-top: 1px solid var(--border);
  margin: 6px 0;
}

/* Multi-fireplace results grid */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 16px;
}
.results-grid .result-card { margin-top: 0; }
.result-config-label {
  display: inline-block;
  background: rgba(77,166,232,0.12);
  color: var(--blue);
  padding: 3px 12px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.results-summary {
  margin-top: 16px;
  padding: 14px 20px;
  background: var(--bg);
  border: 1px solid var(--blue);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--blue);
  text-align: center;
}

/* Warning */
.replace-warning {
  margin-top: 16px;
  padding: 12px 16px;
  background: rgba(241,196,15,0.06);
  border: 1px solid rgba(241,196,15,0.25);
  border-radius: var(--radius-sm);
  color: #f1c40f;
  font-size: 0.82rem;
  font-weight: 500;
  line-height: 1.5;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.replace-warning .warn-icon {
  flex-shrink: 0;
  font-size: 1.1rem;
  line-height: 1.3;
}

/* No result placeholder */
.no-result {
  text-align: center;
  padding: 24px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Formula note */
.formula-note {
  margin-top: 20px;
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
  font-style: italic;
}

/* Table */
.table-wrapper { overflow-x: auto; margin-top: 4px; }
table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
th, td {
  padding: 11px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}
td { color: var(--text); }
tr:hover td { background: rgba(255,255,255,0.02); }

/* Footer */
footer {
  text-align: center;
  padding: 36px 0;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  margin-top: 48px;
}

/* CTA Section */
.cta-section {
  text-align: center;
  padding: 48px 40px;
}
.cta-section h2 {
  font-size: 1.6rem;
  margin-bottom: 24px;
}
.cta-button {
  display: inline-block;
  padding: 14px 40px;
  background: #2980b9;
  color: #fff;
  font-family: 'Poppins', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 12px rgba(41,128,185,0.25);
}
.cta-button:hover {
  background: #2471a3;
  box-shadow: 0 4px 20px rgba(41,128,185,0.35);
}
.cta-link {
  display: block;
  margin-top: 14px;
  color: var(--text-muted);
  font-size: 0.88rem;
  text-decoration: none;
  transition: color 0.2s;
}
.cta-link:hover {
  color: var(--text);
  text-decoration: underline;
}

/* Two-column row for Steps 2 & 3 */
.two-col-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: stretch;
}
.two-col-row .card { margin: 28px 0; padding: 28px 24px; }

/* Responsive */
@media (max-width: 800px) {
  .two-col-row { grid-template-columns: 1fr; }
  .water-hardness-layout { grid-template-columns: 1fr; }
  .card { padding: 24px 20px; margin: 20px 0; }
  .step-row { gap: 14px; }
  .step-num { width: 32px; height: 32px; font-size: 0.85rem; }
  .result-value { font-size: 1.8rem; }
  .fireplace-row { padding: 12px; }
  .fireplace-row .remove-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 6px 10px;
    font-size: 0.9rem;
  }
  .fireplace-row { position: relative; }
  .tile-map { gap: 1px; }
  .state-tile { font-size: 0.32rem; border-radius: 1.5px; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .card { padding: 20px 16px; }
  .form-row { flex-direction: column; gap: 12px; }
  .fireplace-row { grid-template-columns: 1fr; }
  .results-grid { grid-template-columns: 1fr; }
  .state-tile { font-size: 0.24rem; }
}