/* ======================================= */
/* BTW CALCULATOR - MODERN UNIFIED        */
/* ======================================= */

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

.btw-card {
  /* Dark mode colors */
  --btw-bg-card: var(--secondary-bg);
  --btw-bg-input: var(--primary-bg);
  --btw-bg-form: var(--secondary-bg);
  --btw-bg-preset: var(--primary-bg);
  --btw-border: var(--border-color);
  --btw-text: var(--text-primary);
  --btw-text-secondary: var(--text-secondary);
  --btw-button-bg: var(--link-color);
  --btw-button-text: var(--text-primary);
  --btw-button-border: var(--border-color);
  --btw-button-hover-border: var(--link-color);
  --btw-button-hover-shadow: rgba(88, 166, 255, 0.2);
  --btw-type-btn-active-bg: var(--link-color);
  --btw-type-btn-active-border: var(--link-color);
  --btw-type-btn-active-shadow: rgba(88, 166, 255, 0.3);
  --btw-focus-border: var(--link-color);
  --btw-focus-shadow: rgba(88, 166, 255, 0.1);
  --btw-success: #10b981;
  --btw-success-dark: #059669;
  --btw-error: #ef4444;
  --btw-error-dark: #dc2626;
  --btw-error-darker: #b91c1c;
  --btw-error-shadow: rgba(239, 68, 68, 0.3);
  --btw-purple: #9333ea;
  --btw-purple-dark: #7e22ce;
  --btw-blue: #3b82f6;
  --btw-blue-dark: #2563eb;
}

/* Light mode color overrides */
:root.light-mode .btw-card {
  --btw-bg-card: #ffffff;
  --btw-bg-input: #f9fafb;
  --btw-bg-form: #ffffff;
  --btw-bg-preset: #f3f4f6;
  --btw-border: #d0d7de;
  --btw-text: #24292f;
  --btw-text-secondary: #57606a;
  --btw-button-bg: #ffffff;
  --btw-button-text: #24292f;
  --btw-button-border: #d0d7de;
  --btw-button-hover-border: #0969da;
  --btw-button-hover-shadow: rgba(9, 105, 218, 0.15);
  --btw-type-btn-active-bg: #0969da;
  --btw-type-btn-active-border: #0969da;
  --btw-type-btn-active-shadow: rgba(9, 105, 218, 0.2);
  --btw-focus-border: #0969da;
  --btw-focus-shadow: rgba(9, 105, 218, 0.1);
  --btw-success: #10b981;
  --btw-success-dark: #059669;
  --btw-error: #ef4444;
  --btw-error-dark: #dc2626;
  --btw-error-darker: #b91c1c;
  --btw-error-shadow: rgba(239, 68, 68, 0.3);
  --btw-purple: #7c3aed;
  --btw-purple-dark: #6d28d9;
  --btw-blue: #3b82f6;
  --btw-blue-dark: #2563eb;
}

/* ===== MAIN CARD ===== */
.btw-card {
  max-width: 100%;
  margin: 0 auto;
  padding: 1.25rem;
  background: var(--btw-bg-card);
  border: 1px solid var(--btw-border);
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  color: var(--btw-text);
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
}

/* Gradient top border */
.btw-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--btw-purple), var(--btw-type-btn-active-bg), var(--btw-purple));
  background-size: 200% 100%;
  animation: btwGradientShift 3s ease infinite;
}

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

/* ===== HEADER ===== */
.btw-card-title {
  color: var(--btw-text);
  font-size: 1.6rem;
  margin-bottom: 0.375rem;
  text-align: center;
  font-weight: 600;
  letter-spacing: -0.5px;
}

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

/* ===== FEEDBACK ===== */
.btw-card-feedback {
  background: linear-gradient(135deg, var(--btw-success) 0%, var(--btw-success-dark) 100%);
  color: white;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  text-align: center;
  margin-bottom: 1.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  opacity: 0;
  transition: all 0.3s ease;
  visibility: hidden;
  transform: translateY(-10px);
}

.btw-card-feedback.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.btw-card-feedback.error {
  background: linear-gradient(135deg, var(--btw-error) 0%, var(--btw-error-dark) 100%);
}

/* ===== LAYOUT ===== */
.btw-card-main-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 992px) {
  .btw-card-main-layout {
    grid-template-columns: 450px 1fr;
  }
}

.btw-card-left {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.btw-card-right {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: sticky;
  top: 20px;
  align-self: start;
}

/* ===== SECTIONS ===== */
.btw-card-preset-section,
.btw-card-type-section,
.btw-card-rate-section,
.btw-card-input-section,
.btw-card-results-section,
.btw-card-history-section {
  background: var(--btw-bg-form);
  padding: 1rem;
  border-radius: 12px;
  border: 1px solid var(--btw-border);
  transition: all 0.3s ease;
}

.btw-card-preset-section:hover,
.btw-card-type-section:hover,
.btw-card-rate-section:hover,
.btw-card-input-section:hover,
.btw-card-results-section:hover,
.btw-card-history-section:hover {
  border-color: var(--btw-button-hover-border);
}

/* ===== PRESET SECTION ===== */
.preset-title,
.type-title,
.rate-title {
  color: var(--btw-text);
  font-size: 1rem;
  margin: 0 0 0.75rem 0;
  font-weight: 600;
  text-align: center;
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.btw-card .preset-btn {
  background: var(--btw-bg-preset) !important;
  border: 2px solid var(--btw-border);
  border-radius: 8px;
  padding: 0.625rem;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.btw-card .preset-btn:hover {
  border-color: var(--btw-button-hover-border);
  background: var(--btw-bg-form) !important;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px var(--btw-button-hover-shadow);
}

.preset-icon {
  font-size: 1.5rem;
}

.preset-name {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--btw-text);
}

.preset-price {
  font-size: 0.75rem;
  color: var(--btw-purple);
  font-family: monospace;
  font-weight: 600;
}

/* ===== TYPE SECTION ===== */
.type-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.type-btn {
  background: var(--btw-bg-preset);
  border: 2px solid var(--btw-border);
  border-radius: 8px;
  padding: 0.75rem;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.type-btn:hover {
  border-color: var(--btw-button-hover-border);
  background: var(--btw-bg-form);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px var(--btw-button-hover-shadow);
}

.type-btn.active {
  border-color: var(--btw-type-btn-active-border);
  background: var(--btw-type-btn-active-bg);
  box-shadow: 0 2px 8px var(--btw-type-btn-active-shadow);
}

.type-btn.active .type-name,
.type-btn.active .type-desc {
  color: white;
}

.type-icon {
  font-size: 1.5rem;
}

.type-name {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--btw-text);
}

.type-desc {
  font-size: 0.7rem;
  color: var(--btw-text-secondary);
}

/* ===== RATE SECTION ===== */
.rate-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.5rem;
}

.rate-btn {
  background: var(--btw-bg-preset);
  border: 2px solid var(--btw-border);
  border-radius: 8px;
  padding: 0.625rem 0.5rem;
  cursor: pointer;
  transition: all 0.2s ease;
  font-weight: 600;
  color: var(--btw-text);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.85rem;
}

.rate-btn:hover {
  border-color: var(--btw-success);
  background: var(--btw-bg-form);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.2);
}

.rate-btn.active {
  border-color: var(--btw-success);
  background: var(--btw-success);
  color: white;
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

.rate-btn.active .rate-label {
  color: white;
}

.rate-label {
  font-size: 0.65rem;
  font-weight: 400;
  color: var(--btw-text-secondary);
}

.rate-icon {
  font-size: 1.2rem;
}

/* ===== INPUT SECTION ===== */
.btw-card-input-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.btw-card-input-group:last-child {
  margin-bottom: 0;
}

.btw-card-input-group label {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--btw-text);
}

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

.btw-card-input-group input::placeholder {
  color: var(--btw-text-secondary);
  opacity: 0.6;
}

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

/* ===== QUICK TOOLS ===== */
.btw-card-quick-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 0.75rem;
}

.quick-amount-btn {
  padding: 0.5rem 0.8rem;
  background: var(--btw-button-bg);
  border: 2px solid var(--btw-border);
  border-radius: 8px;
  color: var(--btw-text);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.quick-amount-btn:hover {
  background: var(--btw-type-btn-active-bg);
  border-color: var(--btw-type-btn-active-border);
  color: white;
  transform: translateY(-1px);
}

/* ===== ACTION BUTTONS ===== */
.btw-card-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.btw-card-btn {
  padding: 0.875rem 1.5rem;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  border: 2px solid transparent;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btw-card-btn-primary {
  background: var(--btw-type-btn-active-bg);
  border-color: var(--btw-type-btn-active-border);
  color: white;
  box-shadow: 0 2px 8px var(--btw-type-btn-active-shadow);
}

.btw-card-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--btw-type-btn-active-shadow);
  opacity: 0.9;
}

.btw-card-btn-secondary {
  background: var(--btw-error) !important;
  border-color: var(--btw-error-dark) !important;
  color: white !important;
}

.btw-card-btn-secondary:hover {
  background: var(--btw-error-dark) !important;
  border-color: var(--btw-error-darker) !important;
  color: white !important;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--btw-error-shadow) !important;
}

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

/* ===== RESULTS SECTION ===== */
.btw-card-results-section.hidden {
  display: none;
}

.btw-card-results-title {
  color: var(--btw-text);
  text-align: center;
  margin: 0 0 1rem 0;
  font-size: 1.1rem;
  font-weight: 600;
}

.product-name-display {
  text-align: center;
  font-weight: 600;
  padding: 0.625rem;
  background: var(--btw-bg-input);
  border: 1px solid var(--btw-border);
  border-radius: 8px;
  margin-bottom: 1rem;
  display: none;
  color: var(--btw-text);
  font-size: 0.9rem;
}

.product-name-display.visible {
  display: block;
}

.btw-card-result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.btw-card-result-item {
  background: var(--btw-bg-input);
  padding: 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--btw-border);
  text-align: center;
  transition: all 0.2s ease;
}

.btw-card-result-item.highlight {
  border: 2px solid var(--btw-success);
  background: var(--btw-bg-input);
}

.btw-card-result-label {
  display: block;
  font-size: 0.75rem;
  color: var(--btw-text-secondary);
  margin-bottom: 0.25rem;
  font-weight: 500;
}

.btw-card-result-value {
  font-family: monospace;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--btw-text);
}

.btw-card-result-value.btw-amount {
  color: var(--btw-success);
  font-size: 1.3rem;
}

.btw-card-result-value.percentage {
  color: var(--btw-type-btn-active-bg);
}

/* ===== BREAKDOWN BAR ===== */
.btw-card-breakdown {
  background: var(--btw-bg-input);
  padding: 0.875rem;
  border-radius: 8px;
  border: 1px solid var(--btw-border);
}

.breakdown-bar-container {
  height: 28px;
  background: var(--btw-bg-preset);
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 0.625rem;
  border: 1px solid var(--btw-border);
  display: flex;
}

.breakdown-bar {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 0.8rem;
  transition: all 0.6s ease;
}

.breakdown-bar.excl {
  background: linear-gradient(90deg, var(--btw-blue) 0%, var(--btw-blue-dark) 100%);
}

.breakdown-bar.btw {
  background: linear-gradient(90deg, var(--btw-success) 0%, var(--btw-success-dark) 100%);
}

.breakdown-legend {
  display: flex;
  justify-content: space-around;
  gap: 0.75rem;
  font-size: 0.8rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--btw-text-secondary);
}

.legend-color {
  width: 14px;
  height: 14px;
  border-radius: 4px;
}

.legend-color.excl {
  background: var(--btw-blue);
}

.legend-color.btw {
  background: var(--btw-success);
}

.legend-item strong {
  color: var(--btw-text);
  font-family: monospace;
}

/* ===== HISTORY SECTION ===== */
.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.history-title {
  color: var(--btw-text);
  font-size: 1rem;
  margin: 0;
  font-weight: 600;
}

.clear-history-btn {
  background: transparent;
  border: 1px solid var(--btw-border);
  color: var(--btw-text-secondary);
  cursor: pointer;
  padding: 0.375rem 0.625rem;
  border-radius: 6px;
  font-size: 0.75rem;
  transition: all 0.2s ease;
  font-weight: 500;
}

.clear-history-btn:hover {
  border-color: var(--btw-button-hover-border);
  color: var(--btw-text);
  background: var(--btw-bg-card);
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 400px;
  overflow-y: auto;
}

.history-empty {
  text-align: center;
  color: var(--btw-text-secondary);
  font-size: 0.85rem;
  padding: 1rem;
  font-style: italic;
}

.history-item {
  background: var(--btw-bg-input);
  padding: 0.625rem;
  border-radius: 8px;
  border: 1px solid var(--btw-border);
  cursor: pointer;
  transition: all 0.2s ease;
}

.history-item:hover {
  border-color: var(--btw-button-hover-border);
  background: var(--btw-bg-card);
  transform: translateX(2px);
}

.history-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.375rem;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.history-item-product {
  font-size: 0.8rem;
  color: var(--btw-text);
  font-weight: 600;
  flex-basis: 100%;
}

.history-item-type {
  font-size: 0.7rem;
  color: var(--btw-blue);
  font-weight: 600;
}

.history-item-rate {
  font-size: 0.7rem;
  color: var(--btw-success);
  font-weight: 600;
}

.history-item-amounts {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--btw-text-secondary);
  font-family: monospace;
}

.history-item-btw {
  color: var(--btw-success);
  font-weight: 700;
}

/* ===== LIGHT MODE FIXES ===== */
:root.light-mode .btw-card-results-section {
  background: #ffffff;
}

:root.light-mode .product-name-display {
  background: #f9fafb;
  border-color: #d0d7de;
}

:root.light-mode .btw-card-result-item {
  background: #f9fafb;
  border-color: #d0d7de;
}

:root.light-mode .btw-card-breakdown {
  background: #f9fafb;
  border-color: #d0d7de;
}

:root.light-mode .history-item {
  background: #f9fafb;
}

:root.light-mode .history-item:hover {
  background: #ffffff;
}

:root.light-mode .breakdown-bar-container {
  background: #e5e7eb;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 991px) {
  .btw-card {
    padding: 1rem;
  }

  .btw-card-title {
    font-size: 1.5rem;
  }

  .btw-card-main-layout {
    grid-template-columns: 1fr;
  }

  .btw-card-right {
    position: static;
  }

  .preset-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .rate-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .btw-card-result-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 576px) {
  .btw-card {
    padding: 1rem;
    border-radius: 12px;
  }

  .btw-card-title {
    font-size: 1.35rem;
    margin-bottom: 0.5rem;
  }

  .btw-card-subtitle {
    font-size: 0.85rem;
    margin-bottom: 1rem;
  }

  .preset-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
  }

  .preset-btn {
    padding: 0.5rem;
  }

  .preset-icon {
    font-size: 1.25rem;
  }

  .type-grid {
    grid-template-columns: 1fr;
  }

  .rate-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .btw-card-quick-tools {
    gap: 0.375rem;
  }

  .quick-amount-btn {
    padding: 0.4rem 0.7rem;
    font-size: 0.75rem;
  }

  .btw-card-actions {
    grid-template-columns: 1fr;
  }

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