/* ===================================
   Radiomasters Calculators — Design System
   =================================== */

/* ---------- Variables ---------- */
:root {
  --rmcalc-bg: #1e1e2e;
  --rmcalc-bg-input: #14141a;
  --rmcalc-border: rgba(255, 255, 255, 0.12);
  --rmcalc-border-focus: #e94560;
  --rmcalc-text: #ffffff;
  --rmcalc-text-muted: #888;
  --rmcalc-accent: #e94560;
  --rmcalc-accent-hover: #c73e54;
  --rmcalc-success: #4ade80;
  --rmcalc-error: #ef4444;
  --rmcalc-radius: 16px;
  --rmcalc-radius-sm: 12px;
  --rmcalc-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}

/* ---------- Container ---------- */
.rmcalc {
  background: var(--rmcalc-bg);
  border-radius: var(--rmcalc-radius);
  padding: 32px;
  margin: 32px 0;
  border: 1px solid var(--rmcalc-border);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* ---------- Header ---------- */
.rmcalc-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--rmcalc-border);
}

.rmcalc-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--rmcalc-accent), var(--rmcalc-accent-hover));
  border-radius: var(--rmcalc-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.rmcalc-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--rmcalc-text);
  margin: 0;
  line-height: 1.3;
}

.rmcalc-subtitle {
  font-size: 0.85rem;
  color: var(--rmcalc-text-muted);
  margin: 4px 0 0 0;
}

/* ---------- Form ---------- */
.rmcalc-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.rmcalc-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

/* ---------- Fields ---------- */
.rmcalc-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.rmcalc-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--rmcalc-text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.rmcalc-label-hint {
  font-weight: 400;
  color: var(--rmcalc-text-muted);
  font-size: 0.75rem;
}

.rmcalc-input {
  width: 100%;
  padding: 14px 16px;
  background: var(--rmcalc-bg-input);
  border: 2px solid var(--rmcalc-border);
  border-radius: var(--rmcalc-radius-sm);
  color: var(--rmcalc-text);
  font-size: 1rem;
  font-family: inherit;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  outline: none;
  box-sizing: border-box;
}

.rmcalc-input::placeholder {
  color: var(--rmcalc-text-muted);
}

.rmcalc-input:focus {
  border-color: var(--rmcalc-border-focus);
  box-shadow: 0 0 0 4px rgba(233, 69, 96, 0.15);
}

.rmcalc-input:hover:not(:focus) {
  border-color: var(--rmcalc-accent);
}

/* Select */
.rmcalc-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}

/* ---------- Buttons ---------- */
.rmcalc-buttons {
  display: flex;
  gap: 12px;
  margin-top: 8px;
}

.rmcalc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  background: linear-gradient(135deg, var(--rmcalc-accent), var(--rmcalc-accent-hover));
  color: #fff;
  border: none;
  border-radius: var(--rmcalc-radius-sm);
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.rmcalc-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(233, 69, 96, 0.3);
}

.rmcalc-btn:active {
  transform: translateY(0);
}

.rmcalc-btn-secondary {
  background: var(--rmcalc-bg-input);
  border: 2px solid var(--rmcalc-border);
}

.rmcalc-btn-secondary:hover {
  background: var(--rmcalc-bg);
  border-color: var(--rmcalc-accent);
  box-shadow: none;
}

/* ---------- Result ---------- */
.rmcalc-result {
  background: var(--rmcalc-bg-input);
  border: 2px solid var(--rmcalc-border);
  border-radius: var(--rmcalc-radius-sm);
  padding: 20px 24px;
  margin-top: 8px;
  display: none;
}

.rmcalc-result.active {
  display: block;
  animation: rmcalcFadeIn 0.3s ease-out;
}

.rmcalc-result-title {
  font-size: 0.85rem;
  color: var(--rmcalc-text-muted);
  margin: 0 0 12px 0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.rmcalc-result-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--rmcalc-accent);
  margin: 0;
  line-height: 1.2;
}

.rmcalc-result-unit {
  font-size: 1rem;
  font-weight: 400;
  color: var(--rmcalc-text-muted);
  margin-left: 8px;
}

.rmcalc-result-formula {
  font-size: 0.9rem;
  color: var(--rmcalc-text-muted);
  margin: 12px 0 0 0;
  font-family: 'Courier New', monospace;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 8px;
}

/* ---------- Multiple Results ---------- */
.rmcalc-results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.rmcalc-result-item {
  background: rgba(255, 255, 255, 0.03);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
}

.rmcalc-result-item-label {
  font-size: 0.8rem;
  color: var(--rmcalc-text-muted);
  margin: 0 0 6px 0;
}

.rmcalc-result-item-value {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--rmcalc-accent);
  margin: 0;
}

/* ---------- Info Block ---------- */
.rmcalc-info {
  background: rgba(233, 69, 96, 0.08);
  border-left: 3px solid var(--rmcalc-accent);
  border-radius: 0 8px 8px 0;
  padding: 14px 18px;
  margin-top: 16px;
  font-size: 0.9rem;
  color: var(--rmcalc-text-muted);
  line-height: 1.6;
}

.rmcalc-info strong {
  color: var(--rmcalc-text);
}

/* ---------- Checkbox / Toggle ---------- */
.rmcalc-toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

.rmcalc-toggle input {
  width: 20px;
  height: 20px;
  accent-color: var(--rmcalc-accent);
}

/* ---------- Error ---------- */
.rmcalc-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--rmcalc-error);
  border-radius: 8px;
  padding: 12px 16px;
  color: var(--rmcalc-error);
  font-size: 0.9rem;
}

/* ---------- Animations ---------- */
@keyframes rmcalcFadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .rmcalc {
    padding: 20px;
    margin: 20px 0;
    border-radius: 12px;
  }
  
  .rmcalc-header {
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 16px;
  }
  
  .rmcalc-icon {
    width: 40px;
    height: 40px;
    font-size: 20px;
  }
  
  .rmcalc-title {
    font-size: 1.1rem;
  }
  
  .rmcalc-row {
    grid-template-columns: 1fr;
  }
  
  .rmcalc-result-value {
    font-size: 1.5rem;
  }
  
  .rmcalc-buttons {
    flex-direction: column;
  }
  
  .rmcalc-btn {
    width: 100%;
    justify-content: center;
  }
}