/* =======================================
   CIRKEL CALCULATOR - MODERNE STIJL
   ======================================= */

.cirkel-card {
  max-width: 1400px;
  margin: 0 auto;
  padding: 35px;
  background: linear-gradient(
    145deg,
    var(--card-bg) 0%,
    var(--secondary-bg) 100%
  );
  border: 1px solid var(--border-color);
  border-radius: 20px;
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.05) inset;
  color: var(--text-color);
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
  font-family: 'Inter', sans-serif;
}

.cirkel-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--accent-purple),
    var(--accent-blue),
    var(--accent-purple)
  );
  background-size: 200% 100%;
  animation: cirkelGradientShift 3s ease infinite;
}

@keyframes cirkelGradientShift {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

.cirkel-card h1 {
  color: var(--text-primary);
  font-size: 2rem;
  margin-bottom: 8px;
  text-align: center;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.cirkel-card-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 25px;
  font-weight: 400;
}

/* =======================================
   TWEE KOLOMMEN LAYOUT
   ======================================= */

.cirkel-card-main-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

@media (min-width: 900px) {
  .cirkel-card-main-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.cirkel-card-left-column {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.cirkel-card-right-column {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

/* =======================================
   VISUAL SECTION
   ======================================= */

.cirkel-card-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
  background: var(--overlay-medium);
  border-radius: 12px;
  border: 1px solid rgba(45, 55, 72, 0.5);
}

.cirkel-svg {
  width: 100%;
  max-width: 300px;
  height: auto;
  margin-bottom: 20px;
}

.cirkel-card-visual-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
}

.cirkel-card-legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.cirkel-card-legend-color {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.cirkel-card-legend-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* =======================================
   INPUT SECTION
   ======================================= */

.cirkel-card-inputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  padding: 20px;
  background: var(--overlay-medium);
  border-radius: 12px;
  border: 1px solid rgba(45, 55, 72, 0.5);
}

.cirkel-card-input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cirkel-card-input-group label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.cirkel-card-input-icon {
  font-size: 1.1rem;
}

/* NIEUWE INPUT WRAPPER STIJL - gebaseerd op volume converter */
.cirkel-card-input-with-unit {
  display: flex;
  align-items: center;
  background: var(--overlay-dark);
  border: 2px solid var(--border-dark);
  border-radius: 12px;
  overflow: hidden;
  height: 56px;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  position: relative;
}

.cirkel-card-input-with-unit:focus-within {
  border-color: var(--accent-purple);
  box-shadow: 0 0 20px rgba(147, 51, 234, 0.2);
}

.cirkel-card-inputs input[type="number"] {
  flex-grow: 1;
  border: none;
  background: transparent;
  text-align: center;
  font-size: 1.1rem;
  padding: 0 15px;
  height: 100%;
  color: var(--text-primary);
  font-weight: 600;
  font-family: "Roboto Mono", monospace;
  outline: none;
  box-sizing: border-box;
}

.cirkel-card-inputs input[type="number"]::-webkit-inner-spin-button,
.cirkel-card-inputs input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.cirkel-card-inputs input[type="number"] {
  -moz-appearance: textfield;
}

.cirkel-card-inputs input[type="number"]::placeholder {
  color: var(--text-secondary);
  opacity: 0.5;
  font-weight: 400;
}

/* PIJLTJES KNOPPEN - exact zoals volume converter */
.cirkel-card-arrow-controls {
  display: flex;
  flex-direction: column;
  height: 100%;
  border-left: 1px solid var(--border-dark);
}

.cirkel-card-arrow-btn {
  flex: 1;
  width: 50px;
  background: var(--overlay-medium);
  color: var(--text-primary);
  border: none;
  cursor: pointer;
  font-size: 1.4rem;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  position: relative;
}

.cirkel-card-arrow-btn.up {
  border-bottom: 1px solid var(--border-dark);
}

.cirkel-card-arrow-btn:hover {
  background: var(--accent-purple);
  color: white;
}

.cirkel-card-arrow-btn:active {
  transform: scale(0.95);
}

/* Unit label binnen de input */
.cirkel-card-unit {
  padding-right: 15px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
}

/* =======================================
   BUTTONS
   ======================================= */

.cirkel-card-buttons {
  text-align: center;
}

.cirkel-card-btn {
  padding: 14px 25px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  position: relative;
  overflow: hidden;
  color: white;
}

.cirkel-card-btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.cirkel-card-btn:hover::before {
  width: 300px;
  height: 300px;
}

.cirkel-card-btn-secondary {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  box-shadow: 0 4px 15px rgba(239, 68, 68, 0.4);
}

.cirkel-card-btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.6);
}

/* =======================================
   RESULTS SECTION
   ======================================= */

.cirkel-card-results {
  background: var(--overlay-medium);
  padding: 20px;
  border-radius: 12px;
  border: 1px solid rgba(45, 55, 72, 0.5);
  display: block;
}

.cirkel-card-results h3 {
  color: var(--accent-purple);
  font-size: 1.2rem;
  margin: 0 0 15px 0;
  text-align: center;
  font-weight: 700;
}

.cirkel-card-results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
}

.cirkel-card-result-item {
  background: var(--overlay-dark);
  padding: 16px;
  border-radius: 10px;
  border: 2px solid var(--border-dark);
  text-align: center;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.cirkel-card-result-item:hover {
  border-color: var(--accent-purple);
  box-shadow: 0 0 20px rgba(147, 51, 234, 0.2);
}

.cirkel-card-result-item .cirkel-card-result-icon,
.cirkel-card-result-item .cirkel-card-input-icon {
  font-size: 1.5rem;
  color: var(--accent-blue);
}

.cirkel-card-result-content {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.cirkel-card-result-label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.cirkel-card-result-value {
  font-family: "Roboto Mono", monospace;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* =======================================
   FORMULAS SECTION
   ======================================= */

.cirkel-card-formulas {
  background: var(--overlay-medium);
  padding: 20px;
  border-radius: 12px;
  border: 1px solid rgba(45, 55, 72, 0.5);
}

.cirkel-card-formulas h3 {
  color: var(--text-primary);
  font-size: 1.1rem;
  margin: 0 0 15px 0;
  font-weight: 700;
  text-align: center;
}

.cirkel-card-formula-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cirkel-card-formula-item {
  background: var(--overlay-dark);
  padding: 10px 15px;
  border-radius: 8px;
  border: 1px solid var(--border-dark);
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
}

.cirkel-card-formula-item strong {
  color: var(--accent-blue);
  margin-right: 5px;
}

/* =======================================
   NOTE SECTION
   ======================================= */

.cirkel-card-note {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 20px;
  grid-column: 1 / -1;
}

/* =======================================
   RESPONSIVE
   ======================================= */

@media (max-width: 899px) {
  .cirkel-card {
    padding: 20px 12px;
    border-radius: 16px;
  }

  .cirkel-card h1 {
    font-size: 1.5rem;
  }

  .cirkel-card-subtitle {
    font-size: 0.85rem;
  }

  .cirkel-card-visual {
    padding: 15px;
  }

  .cirkel-card-visual-legend {
    gap: 10px;
  }

  .cirkel-card-inputs {
    grid-template-columns: 1fr;
    padding: 15px;
  }

  .cirkel-card-input-with-unit {
    height: 50px;
  }

  .cirkel-card-arrow-btn {
    width: 45px;
    font-size: 1.2rem;
  }

  .cirkel-card-inputs input[type="number"] {
    font-size: 0.95rem;
  }

  .cirkel-card-unit {
    padding-right: 12px;
  }

  .cirkel-card-btn {
    padding: 12px 20px;
    font-size: 0.95rem;
  }

  .cirkel-card-results h3 {
    font-size: 1.1rem;
  }

  .cirkel-card-results-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .cirkel-card-result-item {
    padding: 14px;
  }

  .cirkel-card-result-value {
    font-size: 1.3rem;
  }

  .cirkel-card-formulas h3 {
    font-size: 1.1rem;
  }

  .cirkel-card-formula-item {
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  .cirkel-card {
    padding: 15px 10px;
  }

  .cirkel-card h1 {
    font-size: 1.3rem;
  }

  .cirkel-card-subtitle {
    font-size: 0.8rem;
  }

  .cirkel-card-input-with-unit {
    height: 48px;
  }

  .cirkel-card-arrow-btn {
    width: 42px;
    font-size: 1.1rem;
  }

  .cirkel-card-btn {
    font-size: 0.9rem;
    padding: 10px 15px;
  }

  .cirkel-card-result-value {
    font-size: 1.2rem;
  }
}