/* =======================================
   CIRKEL CALCULATOR - MODERN UNIFIED
   ======================================= */

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

.cirkel-card {
  /* Dark mode colors */
  --cirkel-card-bg-card: var(--secondary-bg);
  --cirkel-card-bg-input: var(--primary-bg);
  --cirkel-card-bg-form: var(--secondary-bg);
  --cirkel-card-border: var(--border-color);
  --cirkel-card-text: var(--text-primary);
  --cirkel-card-text-secondary: var(--text-secondary);
  --cirkel-card-button-bg: var(--link-color);
  --cirkel-card-button-text: var(--text-primary);
  --cirkel-card-button-border: var(--border-color);
  --cirkel-card-button-hover-border: var(--link-color);
  --cirkel-card-button-hover-shadow: rgba(88, 166, 255, 0.2);
  --cirkel-card-accent-blue: #3b82f6;
  --cirkel-card-overlay-dark: rgba(255, 255, 255, 0.05);
  --cirkel-card-overlay-medium: rgba(255, 255, 255, 0.08);
  --cirkel-card-overlay-light: rgba(255, 255, 255, 0.03);
  --cirkel-card-border-dark: rgba(45, 55, 72, 0.5);
  --cirkel-card-focus-border: var(--link-color);
  --cirkel-card-focus-shadow: rgba(88, 166, 255, 0.1);
}

/* Light mode color overrides */
:root.light-mode .cirkel-card {
  --cirkel-card-bg-card: #ffffff;
  --cirkel-card-bg-input: #ffffff;
  --cirkel-card-bg-form: #f9fafb;
  --cirkel-card-border: #d0d7de;
  --cirkel-card-text: #24292f;
  --cirkel-card-text-secondary: #57606a;
  --cirkel-card-button-bg: #ffffff;
  --cirkel-card-button-text: #24292f;
  --cirkel-card-button-border: #d0d7de;
  --cirkel-card-button-hover-border: #0969da;
  --cirkel-card-button-hover-shadow: rgba(9, 105, 218, 0.15);
  --cirkel-card-accent-blue: #3b82f6;
  --cirkel-card-overlay-dark: #f9fafb;
  --cirkel-card-overlay-medium: #f3f4f6;
  --cirkel-card-overlay-light: #ffffff;
  --cirkel-card-border-dark: #d0d7de;
  --cirkel-card-focus-border: #0969da;
  --cirkel-card-focus-shadow: rgba(9, 105, 218, 0.1);
}

/* ===== MAIN CARD ===== */
.cirkel-card {
  max-width: 100%;
  margin: 0 auto;
  padding: 1.25rem;
  background: var(--cirkel-card-bg-card);
  border: 1px solid var(--cirkel-card-border);
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  color: var(--cirkel-card-text);
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* Gradient top border */
.cirkel-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--cirkel-card-accent-blue), #2563eb, var(--cirkel-card-accent-blue));
  background-size: 200% 100%;
  animation: cirkelGradientShift 3s ease infinite;
}

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

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

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

/* ===== TWO COLUMN LAYOUT ===== */
.cirkel-card-main-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

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

.cirkel-card-left-column {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.cirkel-card-right-column {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ===== VISUAL SECTION ===== */
.cirkel-card-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.25rem;
  background: var(--cirkel-card-bg-form);
  border-radius: 12px;
  border: 1px solid var(--cirkel-card-border);
  transition: all 0.3s ease;
}

.cirkel-card-visual:hover {
  border-color: var(--cirkel-card-button-hover-border);
}

.cirkel-svg {
  width: 100%;
  max-width: 300px;
  height: auto;
  margin-bottom: 1.25rem;
}

.cirkel-card-visual-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.25rem;
}

.cirkel-card-legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

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

/* ===== INPUT SECTION ===== */
.cirkel-card-inputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  padding: 1.25rem;
  background: var(--cirkel-card-bg-form);
  border-radius: 12px;
  border: 1px solid var(--cirkel-card-border);
  transition: all 0.3s ease;
}

.cirkel-card-inputs:hover {
  border-color: var(--cirkel-card-button-hover-border);
}

.cirkel-card-input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.cirkel-card-input-group label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--cirkel-card-text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

/* Input wrapper with arrows */
.cirkel-card-input-with-unit {
  display: flex;
  align-items: center;
  background: var(--cirkel-card-bg-input);
  border: 2px solid var(--cirkel-card-border);
  border-radius: 8px;
  overflow: hidden;
  height: 56px;
  transition: all 0.2s ease;
  position: relative;
}

.cirkel-card-input-with-unit:focus-within {
  border-color: var(--cirkel-card-focus-border);
  box-shadow: 0 0 0 3px var(--cirkel-card-focus-shadow);
}

.cirkel-card-inputs input[type="number"] {
  flex-grow: 1;
  border: none;
  background: transparent;
  text-align: center;
  font-size: 1.1rem;
  padding: 0 0.9375rem;
  height: 100%;
  color: var(--cirkel-card-text);
  font-weight: 600;
  font-family: 'Courier New', 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(--cirkel-card-text-secondary);
  opacity: 0.5;
  font-weight: 400;
}

/* Arrow controls */
.cirkel-card-arrow-controls {
  display: flex;
  flex-direction: column;
  height: 100%;
  border-left: 1px solid var(--cirkel-card-border);
  flex-shrink: 0;
}

.cirkel-card-arrow-btn {
  flex: 1;
  width: 32px;
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 0;
  line-height: 0;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}

.cirkel-card-arrow-btn::after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
}

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

.cirkel-card-arrow-btn.up::after {
  border-bottom: 5px solid var(--cirkel-card-text-secondary);
}

.cirkel-card-arrow-btn.down::after {
  border-top: 5px solid var(--cirkel-card-text-secondary);
}

.cirkel-card-arrow-btn:hover {
  background: var(--cirkel-card-overlay-medium);
}

.cirkel-card-arrow-btn:hover.up::after {
  border-bottom-color: var(--cirkel-card-accent-blue);
}

.cirkel-card-arrow-btn:hover.down::after {
  border-top-color: var(--cirkel-card-accent-blue);
}

.cirkel-card-arrow-btn:active {
  background: var(--cirkel-card-overlay-dark);
}

/* Unit label */
.cirkel-card-unit {
  padding-right: 0.9375rem;
  color: var(--cirkel-card-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
}

/* ===== BUTTONS ===== */
.cirkel-card-buttons {
  text-align: center;
}

.cirkel-card-btn {
  padding: 0.875rem 1.5625rem;
  border: 2px solid #ef4444;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  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 ease, height 0.6s ease;
  pointer-events: none;
}

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

.cirkel-card-btn-secondary {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
}

.cirkel-card-btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

.cirkel-card-btn-secondary:active {
  transform: translateY(0);
}

/* ===== RESULTS SECTION ===== */
.cirkel-card-results {
  background: var(--cirkel-card-bg-form);
  padding: 1.25rem;
  border-radius: 12px;
  border: 1px solid var(--cirkel-card-border);
  display: block;
  transition: all 0.3s ease;
}

.cirkel-card-results:hover {
  border-color: var(--cirkel-card-button-hover-border);
}

.cirkel-card-results h3 {
  color: var(--cirkel-card-accent-blue);
  font-size: 1.2rem;
  margin: 0 0 0.9375rem 0;
  text-align: center;
  font-weight: 700;
}

.cirkel-card-results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9375rem;
}

.cirkel-card-result-item {
  background: var(--cirkel-card-bg-input);
  padding: 1rem;
  border-radius: 8px;
  border: 2px solid var(--cirkel-card-border);
  text-align: center;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.cirkel-card-result-item:hover {
  border-color: var(--cirkel-card-button-hover-border);
  box-shadow: 0 4px 12px var(--cirkel-card-button-hover-shadow);
  transform: translateY(-2px);
}

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

.cirkel-card-result-content {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

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

.cirkel-card-result-value {
  font-family: 'Courier New', monospace;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--cirkel-card-text);
}

/* ===== FORMULAS SECTION ===== */
.cirkel-card-formulas {
  background: var(--cirkel-card-bg-form);
  padding: 1.25rem;
  border-radius: 12px;
  border: 1px solid var(--cirkel-card-border);
  transition: all 0.3s ease;
}

.cirkel-card-formulas:hover {
  border-color: var(--cirkel-card-button-hover-border);
}

.cirkel-card-formulas h3 {
  color: var(--cirkel-card-text);
  font-size: 1.1rem;
  margin: 0 0 0.9375rem 0;
  font-weight: 700;
  text-align: center;
}

.cirkel-card-formula-list {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.cirkel-card-formula-item {
  background: var(--cirkel-card-bg-input);
  padding: 0.625rem 0.9375rem;
  border-radius: 8px;
  border: 1px solid var(--cirkel-card-border);
  font-size: 0.9rem;
  color: var(--cirkel-card-text-secondary);
  display: flex;
  align-items: center;
  transition: all 0.2s ease;
}

.cirkel-card-formula-item:hover {
  border-color: var(--cirkel-card-button-hover-border);
  background: var(--cirkel-card-overlay-light);
}

.cirkel-card-formula-item strong {
  color: var(--cirkel-card-accent-blue);
  margin-right: 0.3125rem;
}

/* ===== NOTE SECTION ===== */
.cirkel-card-note {
  text-align: center;
  font-size: 0.8rem;
  color: var(--cirkel-card-text-secondary);
  margin-top: 1.25rem;
  grid-column: 1 / -1;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 899px) {
  .cirkel-card {
    padding: 1rem;
    border-radius: 12px;
  }

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

  .cirkel-card-subtitle {
    font-size: 0.88rem;
  }

  .cirkel-card-visual {
    padding: 0.9375rem;
  }

  .cirkel-card-visual-legend {
    gap: 0.625rem;
  }

  .cirkel-card-inputs {
    grid-template-columns: 1fr;
    padding: 0.9375rem;
  }

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

  .cirkel-card-arrow-btn {
    width: 32px;
    font-size: 0;
  }

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

  .cirkel-card-unit {
    padding-right: 0.75rem;
  }

  .cirkel-card-btn {
    padding: 0.75rem 1.25rem;
    font-size: 0.875rem;
  }

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

  .cirkel-card-results-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .cirkel-card-result-item {
    padding: 0.875rem;
  }

  .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: 576px) {
  .cirkel-card {
    padding: 1rem;
  }

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

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

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

  .cirkel-card-arrow-btn {
    width: 32px;
    font-size: 0;
  }

  .cirkel-card-btn {
    font-size: 0.875rem;
    padding: 0.625rem 0.9375rem;
  }

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