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

/* ===== COLOR DEFINITIONS ===== */
/* Dark mode is default, light mode overrides via :root.light-mode */

.eenheden-card {
  /* Dark mode colors */
  --eenheden-bg-card: var(--secondary-bg);
  --eenheden-bg-input: var(--primary-bg);
  --eenheden-bg-form: var(--secondary-bg);
  --eenheden-bg-preview: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
  --eenheden-border: var(--border-color);
  --eenheden-text: var(--text-primary);
  --eenheden-text-secondary: var(--text-secondary);
  --eenheden-button-bg: var(--link-color);
  --eenheden-button-text: var(--text-primary);
  --eenheden-button-border: var(--border-color);
  --eenheden-button-hover-border: var(--link-color);
  --eenheden-button-hover-shadow: rgba(88, 166, 255, 0.2);
  --eenheden-type-btn-active-bg: var(--link-color);
  --eenheden-type-btn-active-border: var(--link-color);
  --eenheden-type-btn-active-shadow: rgba(88, 166, 255, 0.3);
  --eenheden-focus-border: var(--link-color);
  --eenheden-focus-shadow: rgba(88, 166, 255, 0.1);
}

/* Light mode color overrides */
:root.light-mode .eenheden-card {
  --eenheden-bg-card: #ffffff;
  --eenheden-bg-input: #ffffff;
  --eenheden-bg-form: #f9fafb;
  --eenheden-bg-preview: #ffffff;
  --eenheden-border: #d0d7de;
  --eenheden-text: #24292f;
  --eenheden-text-secondary: #57606a;
  --eenheden-button-bg: #ffffff;
  --eenheden-button-text: #24292f;
  --eenheden-button-border: #d0d7de;
  --eenheden-button-hover-border: #0969da;
  --eenheden-button-hover-shadow: rgba(9, 105, 218, 0.15);
  --eenheden-type-btn-active-bg: #0969da;
  --eenheden-type-btn-active-border: #0969da;
  --eenheden-type-btn-active-shadow: rgba(9, 105, 218, 0.2);
  --eenheden-focus-border: #0969da;
  --eenheden-focus-shadow: rgba(9, 105, 218, 0.1);
}

/* ===== MAIN CARD ===== */
.eenheden-card {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.25rem;
  background: var(--eenheden-bg-card);
  border: 1px solid var(--eenheden-border);
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  color: var(--eenheden-text);
  position: relative;
  overflow: hidden;
}

/* Gradient top border */
.eenheden-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #9333ea, #3b82f6, #9333ea);
  background-size: 200% 100%;
  animation: eenhedenGradientShift 3s ease infinite;
}

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

/* ===== HEADER ===== */
.eenheden-card h1 {
  color: var(--eenheden-text);
  font-size: 1.6rem;
  margin-bottom: 1rem;
  text-align: center;
  font-weight: 600;
  letter-spacing: -0.5px;
}

.eenheden-card .intro {
  text-align: center;
  color: var(--eenheden-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  line-height: 1.6;
  font-weight: 400;
}

/* ===== CATEGORY SECTION ===== */
.eenheden-category-section {
  margin-bottom: 1rem;
}

.eenheden-category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.75rem;
}

.eenheden-category-btn {
  padding: 0.625rem 1rem;
  background: var(--eenheden-bg-form);
  border: 2px solid var(--eenheden-border);
  border-radius: 8px;
  color: var(--eenheden-text);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.eenheden-category-btn:hover:not(.active) {
  border-color: var(--eenheden-button-hover-border);
  transform: translateY(-1px);
}

.eenheden-category-btn.active {
  background: var(--eenheden-type-btn-active-bg) !important;
  border-color: var(--eenheden-type-btn-active-border) !important;
  color: white !important;
  box-shadow: 0 4px 12px var(--eenheden-type-btn-active-shadow);
}

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

.eenheden-category-name {
  font-size: 0.85rem;
}

/* ===== INPUT SECTION ===== */
.eenheden-input-section {
  margin-bottom: 0.75rem;
  background: var(--eenheden-bg-form);
  border: 1px solid var(--eenheden-border);
  border-radius: 12px;
  padding: 1rem;
  transition: all 0.3s ease;
}

.eenheden-input-section:hover {
  border-color: var(--eenheden-button-hover-border);
}

.eenheden-input-label {
  display: block;
  color: var(--eenheden-text);
  font-weight: 500;
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

.eenheden-input-wrapper {
  position: relative;
}

.eenheden-input-section input {
  width: 100%;
  padding: 0.6rem 50px 0.6rem 0.8rem;
  background: var(--eenheden-bg-input);
  color: var(--eenheden-text);
  border: 2px solid var(--eenheden-border);
  border-radius: 8px;
  font-size: 0.9rem;
  font-family: inherit;
  transition: all 0.2s ease;
  box-sizing: border-box;
}

.eenheden-input-section input:focus {
  outline: none;
  border-color: var(--eenheden-focus-border);
  box-shadow: 0 0 0 3px var(--eenheden-focus-shadow);
}

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

/* Arrow controls */
.eenheden-arrow-controls {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.eenheden-arrow-btn {
  width: 24px;
  height: 20px;
  background: var(--eenheden-button-bg);
  border: 2px solid var(--eenheden-button-border);
  border-radius: 4px;
  color: var(--eenheden-button-text);
  cursor: pointer;
  font-size: 0.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  user-select: none;
}

.eenheden-arrow-btn:hover {
  background: var(--eenheden-type-btn-active-bg);
  color: white;
  border-color: var(--eenheden-type-btn-active-border);
}

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

/* ===== UNITS SECTION ===== */
.eenheden-units-section {
  background: var(--eenheden-bg-form);
  border: 1px solid var(--eenheden-border);
  border-radius: 12px;
  padding: 1rem;
  transition: all 0.3s ease;
  margin-bottom: 0.75rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: end;
}

.eenheden-units-section:hover {
  border-color: var(--eenheden-button-hover-border);
}

.eenheden-unit-select-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.eenheden-unit-select-wrapper label {
  color: var(--eenheden-text);
  font-size: 0.875rem;
  font-weight: 500;
}

.eenheden-unit-select-wrapper select {
  width: 100%;
  padding: 0.6rem 40px 0.6rem 0.8rem;
  background: var(--eenheden-bg-input);
  color: var(--eenheden-text);
  border: 2px solid var(--eenheden-border);
  border-radius: 8px;
  font-size: 0.9rem;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s 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;
  box-sizing: border-box;
}

.eenheden-unit-select-wrapper select:focus {
  outline: none;
  border-color: var(--eenheden-focus-border);
  box-shadow: 0 0 0 3px var(--eenheden-focus-shadow);
}

.eenheden-conversion-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--eenheden-focus-border);
  padding-bottom: 5px;
  filter: drop-shadow(0 2px 8px var(--eenheden-button-hover-shadow));
}

/* ===== RESULT SECTION ===== */
.eenheden-result {
  background: var(--eenheden-bg-form);
  border: 2px solid var(--eenheden-type-btn-active-border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 0.75rem;
  animation: eenhedenFadeIn 0.3s ease;
  text-align: center;
  box-shadow: 0 2px 8px var(--eenheden-type-btn-active-shadow);
}

@keyframes eenhedenFadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.eenheden-result-line {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

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

.eenheden-result-value.highlight {
  color: var(--eenheden-type-btn-active-bg);
  font-size: 1.8rem;
}

.eenheden-result-unit {
  color: var(--eenheden-text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
}

.eenheden-result-equals {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--eenheden-text-secondary);
  margin: 0 0.5rem;
}

/* ===== NOTE SECTION ===== */
.eenheden-note {
  text-align: center;
  color: var(--eenheden-text-secondary);
  font-size: 0.85rem;
  line-height: 1.5;
  padding: 0.875rem;
  background: var(--eenheden-bg-form);
  border-radius: 8px;
  border: 1px solid var(--eenheden-border);
}

.eenheden-note small {
  display: block;
  font-weight: 400;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .eenheden-card {
    padding: 1rem;
    border-radius: 12px;
  }

  .eenheden-card h1 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
  }

  .eenheden-card .intro {
    font-size: 0.85rem;
    margin-bottom: 1.25rem;
  }

  .eenheden-category-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.625rem;
  }

  .eenheden-category-btn {
    padding: 0.5rem 0.875rem;
  }

  .eenheden-category-icon {
    font-size: 1.5rem;
  }

  .eenheden-input-section,
  .eenheden-units-section {
    padding: 0.875rem;
  }

  .eenheden-input-section input {
    padding: 0.55rem 50px 0.55rem 0.75rem;
    font-size: 0.875rem;
  }

  .eenheden-units-section {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .eenheden-conversion-arrow {
    transform: rotate(90deg);
    padding: 0.5rem 0;
  }

  .eenheden-unit-select-wrapper select {
    padding: 0.55rem 40px 0.55rem 0.75rem;
  }

  .eenheden-result {
    padding: 1.25rem;
  }

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

  .eenheden-result-value.highlight {
    font-size: 1.5rem;
  }

  .eenheden-result-unit {
    font-size: 0.8rem;
  }

  .eenheden-result-equals {
    font-size: 1.1rem;
  }
}

@media (max-width: 375px) {
  .eenheden-card {
    padding: 0.875rem;
  }

  .eenheden-card h1 {
    font-size: 1.35rem;
  }

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

  .eenheden-category-btn {
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
  }

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

  .eenheden-result-value.highlight {
    font-size: 1.4rem;
  }
}