/* Multi Calcverter – scoped under #mc-wrap so it doesn't affect the rest of the page */
#mc-wrap {
  --bg: #1a1a2e;
  --surface: #16213e;
  --card: #0f3460;
  --accent: #e94560;
  --text: #eaeaea;
  --text2: #a0a0b0;
  --btn: #1a1a2e;
  --border: #2a2a4a;
  --input: #0f3460;
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', sans-serif;
  transition: all 0.3s;
  border-radius: 12px;
  overflow: hidden;
}
#mc-wrap.light {
  --bg: #f0f4ff;
  --surface: #fff;
  --card: #e8eeff;
  --accent: #4f46e5;
  --text: #1e1e2e;
  --text2: #6b7280;
  --btn: #e8eeff;
  --border: #d1d5db;
  --input: #f9fafb;
}
#mc-wrap.ocean {
  --bg: #0d1b2a;
  --surface: #1b263b;
  --card: #415a77;
  --accent: #00b4d8;
  --text: #e0fbfc;
  --text2: #98c1d9;
  --btn: #1b263b;
  --border: #415a77;
  --input: #1b263b;
}
#mc-wrap.forest {
  --bg: #1a2e1a;
  --surface: #223322;
  --card: #2d4a2d;
  --accent: #52b788;
  --text: #d8f3dc;
  --text2: #95d5b2;
  --btn: #223322;
  --border: #2d4a2d;
  --input: #223322;
}

#mc-wrap * {
  box-sizing: border-box;
}
#mc-wrap header {
  background: var(--surface);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}
#mc-wrap .theme-btns {
  display: flex;
  gap: 6px;
}
#mc-wrap .theme-btn {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid var(--border);
  cursor: pointer;
  transition: transform 0.2s;
}
#mc-wrap .theme-btn:hover {
  transform: scale(1.2);
}
#mc-wrap .theme-btn.dark { background: #1a1a2e; }
#mc-wrap .theme-btn.light { background: #f0f4ff; border-color: #888; }
#mc-wrap .theme-btn.ocean { background: #0d1b2a; }
#mc-wrap .theme-btn.forest { background: #1a2e1a; }

#mc-wrap nav {
  display: flex;
  overflow-x: auto;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
#mc-wrap nav button {
  flex: 1;
  min-width: 100px;
  padding: 11px 6px;
  background: none;
  border: none;
  color: var(--text2);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 600;
  border-bottom: 3px solid transparent;
  transition: all 0.2s;
  white-space: nowrap;
}
#mc-wrap nav button.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
#mc-wrap nav button:hover {
  color: var(--text);
  background: var(--card);
}

#mc-wrap .tab {
  display: none;
  padding: 20px;
  max-width: 640px;
  margin: 0 auto;
}
#mc-wrap .tab.active {
  display: block;
}

#mc-wrap .display {
  background: var(--input);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 14px;
  text-align: right;
}
#mc-wrap .display .expr {
  font-size: 0.85rem;
  color: var(--text2);
  min-height: 20px;
  word-break: break-all;
}
#mc-wrap .display .result {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  word-break: break-all;
}

#mc-wrap .grid {
  display: grid;
  gap: 8px;
}
#mc-wrap .grid-4 { grid-template-columns: repeat(4, 1fr); }
#mc-wrap .grid-5 { grid-template-columns: repeat(5, 1fr); }

#mc-wrap .calc-btn {
  padding: 14px 8px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--btn);
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.15s;
  font-weight: 500;
}
#mc-wrap .calc-btn:hover {
  background: var(--accent);
  color: #fff;
  transform: scale(1.04);
}
#mc-wrap .calc-btn.op { color: var(--accent); }
#mc-wrap .calc-btn.eq {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
#mc-wrap .calc-btn.eq:hover { opacity: 0.85; }
#mc-wrap .calc-btn.fn { font-size: 0.8rem; }

#mc-wrap label {
  display: block;
  font-size: 0.82rem;
  color: var(--text2);
  margin-bottom: 4px;
}
#mc-wrap select,
#mc-wrap input[type=number] {
  width: 100%;
  padding: 9px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--input);
  color: var(--text);
  font-size: 0.95rem;
  outline: none;
  transition: border 0.2s;
}
#mc-wrap select:focus,
#mc-wrap input:focus {
  border-color: var(--accent);
}

#mc-wrap .conv-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 10px;
  align-items: end;
  margin-top: 10px;
}
#mc-wrap .swap-btn {
  padding: 10px 14px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.1rem;
}
#mc-wrap .swap-btn:hover { opacity: 0.8; }

#mc-wrap .conv-result {
  margin-top: 12px;
  background: var(--card);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
}
#mc-wrap .conv-result span {
  font-size: 0.85rem;
  color: var(--text2);
  font-weight: 400;
  display: block;
}

#mc-wrap .cat-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}
#mc-wrap .cat-tab {
  padding: 6px 12px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--btn);
  color: var(--text2);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}
#mc-wrap .cat-tab.active,
#mc-wrap .cat-tab:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

#mc-wrap .section-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}

#mc-wrap .energy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
#mc-wrap .energy-card {
  background: var(--card);
  border-radius: 10px;
  padding: 12px;
  text-align: center;
}
#mc-wrap .energy-card .val {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
}
#mc-wrap .energy-card .lbl {
  font-size: 0.75rem;
  color: var(--text2);
  margin-top: 4px;
}

#mc-wrap .energy-desc {
  font-size: 0.8rem;
  color: var(--text2);
  margin: -4px 0 10px 0;
}

#mc-wrap .ohm-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
  margin-bottom: 10px;
}

#mc-wrap .cable-table-wrap {
  overflow-x: auto;
  margin: 10px 0;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
}

#mc-wrap .cable-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

#mc-wrap .cable-table th,
#mc-wrap .cable-table td {
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

#mc-wrap .cable-table th {
  background: var(--surface);
  color: var(--accent);
  font-weight: 600;
}

#mc-wrap .cable-table tbody tr:hover {
  background: var(--surface);
}

#mc-wrap .cable-table td:first-child {
  font-weight: 500;
}

#mc-wrap .resistor-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

#mc-wrap .resistor-row label {
  margin-bottom: 0;
}

#mc-wrap .resistor-bands-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}

#mc-wrap .resistor-band {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 100px;
}

#mc-wrap .resistor-band .resistor-select {
  padding: 6px 8px;
  font-size: 0.85rem;
}

#mc-wrap .resistor-swatch {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

#mc-wrap .resistor-legend {
  font-size: 0.75rem;
  color: var(--text2);
  margin-bottom: 8px;
  line-height: 1.4;
}

#mc-wrap .calc-btn-full {
  width: 100%;
  padding: 11px;
  margin-top: 10px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}
#mc-wrap .calc-btn-full:hover { opacity: 0.85; }

#mc-wrap .info {
  font-size: 0.78rem;
  color: var(--text2);
  text-align: center;
  margin-top: 8px;
}

/* HEATING TAB */
#mc-wrap .heat-section {
  background: var(--card);
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 14px;
}
#mc-wrap .heat-section h3 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}
#mc-wrap .two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
#mc-wrap .three-col {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
}
#mc-wrap .field { margin-bottom: 0; }

#mc-wrap .heat-results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 4px;
}
#mc-wrap .heat-card {
  background: var(--surface);
  border-radius: 10px;
  padding: 12px;
  border: 1px solid var(--border);
  transition: border 0.2s;
}
#mc-wrap .heat-card.best { border-color: var(--accent); }
#mc-wrap .heat-card .fuel-name {
  font-size: 0.8rem;
  color: var(--text2);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 5px;
}
#mc-wrap .heat-card .fuel-cost {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}
#mc-wrap .heat-card .fuel-cost.best-val { color: var(--accent); }
#mc-wrap .heat-card .fuel-detail {
  font-size: 0.72rem;
  color: var(--text2);
  margin-top: 3px;
}
#mc-wrap .badge {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-size: 0.65rem;
  padding: 2px 6px;
  border-radius: 10px;
  margin-left: 4px;
  vertical-align: middle;
}
#mc-wrap .divider {
  height: 1px;
  background: var(--border);
  margin: 14px 0;
}
#mc-wrap .input-unit {
  font-size: 0.75rem;
  color: var(--text2);
  margin-top: 3px;
}