/* ======================================================
   ENHANCED EENHEDEN-OMVORMER TOOL
   ====================================================== */

.unit-converter-card {
  max-width: 1000px;
  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;
}

.unit-converter-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: unit-converter-card-gradient-shift 3s ease infinite;
}

@keyframes unit-converter-card-gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

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

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

.unit-converter-card-category-section {
  margin-bottom: 30px;
}

.unit-converter-card-category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}

.unit-converter-card-category-btn {
  padding: 16px 14px;
  border: 1px solid rgba(45, 55, 72, 0.5);
  border-radius: 12px;
  background: var(--overlay-medium);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  position: relative;
  overflow: hidden;
}

.unit-converter-card-category-btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(147, 51, 234, 0.1);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.unit-converter-card-category-btn:hover {
  background: var(--overlay-light);
  border-color: var(--accent-purple);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(147, 51, 234, 0.3);
}

.unit-converter-card-category-btn:hover::before {
  width: 300px;
  height: 300px;
}

.unit-converter-card-category-btn.active {
  background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-purple-dark) 100%);
  border-color: var(--accent-purple);
  color: white;
  box-shadow: 0 4px 15px rgba(147, 51, 234, 0.4);
}

.unit-converter-card-category-icon {
  font-size: 1.8rem;
  filter: grayscale(0.2);
}

.unit-converter-card-category-name {
  font-size: 0.85rem;
}

.unit-converter-card-input-section {
  margin-bottom: 25px;
}

.unit-converter-card-input-label {
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 12px;
  display: block;
}

.unit-converter-card-input-with-icon {
  position: relative;
}

.unit-converter-card-input-section input {
  width: 100%;
  padding: 16px;
  border: 2px solid var(--border-dark);
  border-radius: 12px;
  background: var(--overlay-dark);
  color: var(--text-primary);
  font-size: 1.2rem;
  font-weight: 600;
  font-family: "Roboto Mono", monospace;
  transition: all 0.3s ease;
  box-sizing: border-box;
  backdrop-filter: blur(10px);
}

.unit-converter-card-input-section input:focus {
  outline: none;
  border-color: var(--accent-purple);
  box-shadow: 0 0 20px rgba(147, 51, 234, 0.2);
}

.unit-converter-card-input-section input::placeholder {
  color: var(--text-secondary);
  opacity: 0.6;
}

.unit-converter-card-units-section {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 20px;
  align-items: end;
  margin-bottom: 25px;
}

.unit-converter-card-unit-select-wrapper {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.unit-converter-card-unit-select-wrapper label {
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.unit-converter-card-unit-select-wrapper select {
  width: 100%;
  padding: 14px 40px 14px 14px;
  border: 2px solid var(--border-dark);
  border-radius: 12px;
  background: var(--overlay-dark);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: url('data:image/svg+xml;utf8,<svg fill="%239333ea" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M7 10l5 5 5-5z"/><path d="M0 0h24v24H0z" fill="none"/></svg>');
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 20px;
  backdrop-filter: blur(10px);
}

.unit-converter-card-unit-select-wrapper select:focus {
  outline: none;
  border-color: var(--accent-purple);
  box-shadow: 0 0 20px rgba(147, 51, 234, 0.2);
}

.unit-converter-card-conversion-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-purple);
  padding-bottom: 5px;
  filter: drop-shadow(0 2px 8px rgba(147, 51, 234, 0.3));
}

.unit-converter-card-result {
  background: var(--overlay-dark);
  border: 2px solid var(--accent-purple);
  border-radius: 12px;
  padding: 25px;
  margin-bottom: 20px;
  animation: unit-converter-card-fade-in 0.3s ease;
  text-align: center;
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 15px rgba(147, 51, 234, 0.2);
}

@keyframes unit-converter-card-fade-in {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.unit-converter-card-result-line {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
}

.unit-converter-card-result-value {
  font-family: "Roboto Mono", monospace;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-primary);
}

.unit-converter-card-result-value.highlight {
  color: var(--accent-purple);
  font-size: 2rem;
}

.unit-converter-card-result-unit {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
}

.unit-converter-card-result-equals {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin: 0 10px;
}

.unit-converter-card-note {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.5;
  padding: 14px;
  background: var(--overlay-medium);
  border-radius: 10px;
  border: 1px solid rgba(45, 55, 72, 0.5);
}

.unit-converter-card-note small {
  display: block;
  font-weight: 500;
}

@media (max-width: 768px) {
  .unit-converter-card {
    padding: 20px 12px;
    border-radius: 16px;
    margin: 0 auto;
    width: 100%;
    max-width: 100%;
    overflow: hidden;
  }

  .unit-converter-card * {
    max-width: 100%;
    box-sizing: border-box;
  }

  .unit-converter-card h1 {
    font-size: 1.5rem;
    margin-bottom: 6px;
  }

  .unit-converter-card .intro {
    font-size: 0.85rem;
    margin-bottom: 20px;
  }

  .unit-converter-card-category-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .unit-converter-card-category-btn {
    padding: 14px 12px;
  }

  .unit-converter-card-category-icon {
    font-size: 1.5rem;
  }

  .unit-converter-card-input-section input {
    padding: 14px;
    font-size: 1.1rem;
  }

  .unit-converter-card-units-section {
    grid-template-columns: 1fr;
    gap: 15px;
  }

  .unit-converter-card-conversion-arrow {
    transform: rotate(90deg);
    padding: 10px 0;
  }

  .unit-converter-card-unit-select-wrapper select {
    padding: 12px 40px 12px 12px;
  }

  .unit-converter-card-result {
    padding: 20px 15px;
  }

  .unit-converter-card-result-value {
    font-size: 1.4rem;
  }

  .unit-converter-card-result-value.highlight {
    font-size: 1.6rem;
  }

  .unit-converter-card-result-unit {
    font-size: 0.85rem;
  }

  .unit-converter-card-result-equals {
    font-size: 1.2rem;
  }
}

@media (max-width: 375px) {
  .unit-converter-card {
    padding: 16px 10px;
  }

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

  .unit-converter-card .intro {
    font-size: 0.8rem;
  }

  .unit-converter-card-category-btn {
    padding: 12px 10px;
  }

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

  .unit-converter-card-result-value.highlight {
    font-size: 1.4rem;
  }
}