/* Calculator page — extends theme.css tokens */

.hidden { display: none !important; }

/* ===== NAV ===== */
.calc-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  background: rgba(10, 15, 13, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.calc-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--fg-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-brand:hover { color: var(--accent); }

.nav-tagline {
  font-size: 0.78rem;
  color: var(--fg-muted);
  letter-spacing: 0.04em;
}

/* ===== MAIN ===== */
.calc-body {
  background: var(--bg-primary);
}

.calc-main {
  padding: 110px 0 60px;
  min-height: 100vh;
}

/* ===== HEADER ===== */
.calc-header {
  max-width: 680px;
  margin: 0 auto 60px;
  text-align: center;
}

.calc-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  line-height: 1.1;
}

.calc-sub {
  font-size: 1rem;
  color: var(--fg-secondary);
  line-height: 1.7;
}

/* ===== LAYOUT ===== */
.calc-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

/* ===== FORM PANEL ===== */
.calc-form-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 40px;
  position: sticky;
  top: 90px;
}

.form-section-label {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 28px;
}

.input-group {
  margin-bottom: 28px;
}

.input-label {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
  margin-bottom: 14px;
}

.input-icon {
  font-size: 1.3rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.input-label strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--fg-primary);
  margin-bottom: 2px;
}

.input-label small {
  font-size: 0.8rem;
  color: var(--fg-muted);
  font-style: normal;
}

.input-row {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Slider */
.slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--bg-secondary);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
  position: relative;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 0 3px var(--accent-glow);
  transition: box-shadow 0.2s;
}

.slider:hover::-webkit-slider-thumb {
  box-shadow: 0 0 0 6px var(--accent-glow);
}

.slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border: none;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

/* Number input */
.num-input {
  width: 80px;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--fg-primary);
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  text-align: center;
  outline: none;
  transition: border-color 0.2s;
  -moz-appearance: textfield;
}

.num-input::-webkit-outer-spin-button,
.num-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
}

.num-input:focus {
  border-color: var(--accent);
}

/* Submit */
.calc-submit {
  width: 100%;
  padding: 16px 28px;
  background: var(--accent);
  color: #0a0f0d;
  border: none;
  border-radius: 14px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.01em;
  margin-top: 8px;
  transition: opacity 0.2s, transform 0.15s;
}

.calc-submit:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.calc-submit:active {
  transform: translateY(0);
}

/* ===== RESULTS PANEL ===== */
.calc-results-panel {
  min-height: 400px;
}

/* Idle */
.results-idle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 60px 40px;
  text-align: center;
}

.idle-icon {
  font-size: 3rem;
  margin-bottom: 16px;
}

.idle-text {
  color: var(--fg-muted);
  font-size: 0.95rem;
  margin-bottom: 36px;
}

.idle-preview {
  display: flex;
  justify-content: center;
  gap: 40px;
}

.idle-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.idle-val {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--fg-muted);
}

.idle-lbl {
  font-size: 0.78rem;
  color: var(--fg-muted);
}

/* Active results */
.results-active {
  display: flex;
  flex-direction: column;
  gap: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 24px;
  overflow: hidden;
}

/* Headline */
.result-headline {
  padding: 36px 36px 28px;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-card) 100%);
  border-bottom: 1px solid var(--border);
  text-align: center;
}

.results-label {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 12px;
}

.co2-display {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 10px;
  margin-bottom: 10px;
}

.co2-value {
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.04em;
  line-height: 1;
}

.co2-unit {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--fg-secondary);
}

.co2-context {
  font-size: 0.85rem;
  color: var(--fg-muted);
  font-style: italic;
}

/* Three metrics */
.result-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  padding: 24px 36px;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}

.metric {
  text-align: center;
  padding: 16px 8px;
}

.metric-icon {
  font-size: 1.4rem;
  margin-bottom: 8px;
}

.metric-value {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--fg-primary);
  letter-spacing: -0.02em;
}

.metric-label {
  font-size: 0.78rem;
  color: var(--fg-secondary);
  font-weight: 600;
  margin-top: 2px;
}

.metric-sub {
  font-size: 0.73rem;
  color: var(--fg-muted);
  margin-top: 2px;
}

/* Breakdown */
.breakdown {
  padding: 24px 36px;
  border-bottom: 1px solid var(--border);
}

.breakdown-label {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 16px;
}

.bar-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.bar-label {
  font-size: 0.82rem;
  color: var(--fg-secondary);
  width: 70px;
  flex-shrink: 0;
}

.bar-track {
  flex: 1;
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.bar-amount {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--fg-secondary);
  width: 80px;
  text-align: right;
  flex-shrink: 0;
}

/* Grow it back divider */
.grow-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 36px 0;
}

.grow-divider-line {
  flex: 1;
  height: 1px;
  background: var(--border);
}

.grow-divider-text {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  flex-shrink: 0;
}

/* Kit recommendation */
.kit-recommendation {
  padding: 24px 36px 36px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.kit-header {
  display: flex;
  align-items: center;
  gap: 16px;
}

.kit-emoji {
  font-size: 2.2rem;
  flex-shrink: 0;
}

.kit-name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--fg-primary);
}

.kit-offset {
  font-size: 0.8rem;
  color: var(--accent);
  margin-top: 2px;
}

.kit-price {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--fg-primary);
  margin-left: auto;
}

.kit-desc {
  font-size: 0.9rem;
  color: var(--fg-secondary);
  line-height: 1.6;
}

.kit-details {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.kit-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 100px;
}

.kit-cta {
  display: block;
  padding: 16px 24px;
  background: var(--accent);
  color: #0a0f0d;
  border-radius: 14px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  text-align: center;
  transition: opacity 0.2s, transform 0.15s;
}

.kit-cta:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.kit-note {
  font-size: 0.78rem;
  color: var(--fg-muted);
  line-height: 1.5;
  text-align: center;
}

/* Recalculate */
.recalculate-btn {
  margin: 0 36px 28px;
  background: none;
  border: 1px solid var(--border);
  color: var(--fg-secondary);
  padding: 10px 20px;
  border-radius: 10px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
  align-self: flex-start;
}

.recalculate-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===== METHODOLOGY ===== */
.methodology {
  margin-top: 48px;
  padding: 24px 32px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  font-size: 0.82rem;
  color: var(--fg-muted);
  line-height: 1.6;
}

.methodology a {
  color: var(--accent);
  text-decoration: none;
}

.methodology a:hover {
  text-decoration: underline;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .calc-layout {
    grid-template-columns: 1fr;
  }

  .calc-form-panel {
    position: static;
    padding: 28px 24px;
  }

  .result-headline,
  .result-metrics,
  .breakdown,
  .kit-recommendation {
    padding-left: 24px;
    padding-right: 24px;
  }

  .grow-divider {
    padding-left: 24px;
    padding-right: 24px;
  }

  .recalculate-btn {
    margin-left: 24px;
    margin-right: 24px;
  }

  .idle-preview {
    gap: 24px;
  }
}

@media (max-width: 480px) {
  .calc-header {
    margin-bottom: 36px;
  }

  .result-metrics {
    grid-template-columns: 1fr 1fr 1fr;
    padding: 16px;
    gap: 4px;
  }

  .metric {
    padding: 12px 4px;
  }

  .metric-value {
    font-size: 1.2rem;
  }

  .co2-value {
    font-size: 3rem;
  }

  .kit-header {
    flex-wrap: wrap;
  }

  .kit-price {
    margin-left: 0;
  }
}