/* ========== Multi-Mode Calculator Tool Page ========== */
.tool-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px;
}

.tool-header {
  text-align: center;
  margin-bottom: 24px;
}

.tool-header h1 {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-heading);
  margin-bottom: 8px;
}

.tool-header .tool-desc {
  font-size: 16px;
  color: var(--color-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Mode Tabs */
.calc-tabs {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: stretch;
  margin-bottom: 0;
  padding: 12px;
  background: var(--color-bg-card);
  border-radius: 12px;
  border: 1px solid var(--color-border);
  width: 160px;
  flex-shrink: 0;
}

.calc-tab {
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 600;
  background: #fff;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.calc-tab:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-primary);
}

.calc-tab.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* Calculator Container */
.calc-container {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 14px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  flex-shrink: 0;
  width: 340px;
}

/* Mode-specific containers */
.calc-mode {
  display: none;
}

.calc-mode.active {
  display: block;
}

/* Display */
.calc-display {
  background: #1e1e2e;
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 10px;
  min-height: 64px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: flex-end;
}

.calc-display-expression {
  font-size: 12px;
  color: #a6adc8;
  margin-bottom: 4px;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.calc-display-result {
  font-size: 26px;
  font-weight: 700;
  color: #cdd6f4;
  font-family: 'Consolas', 'Monaco', monospace;
  word-break: break-all;
}

.calc-display-result.small {
  font-size: 24px;
}

/* Angle Mode Toggle */
.angle-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
  justify-content: center;
}

.angle-toggle label {
  font-size: 13px;
  color: var(--color-muted);
}

.angle-toggle button {
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 600;
  background: #f3f4f6;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}

.angle-toggle button.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* Buttons Grid */
.calc-buttons {
  display: grid;
  gap: 8px;
}

/* Standard Calculator: 5 columns */
.calc-buttons.standard {
  grid-template-columns: repeat(5, 1fr);
}

/* Scientific Calculator: 8 columns */
.calc-buttons.scientific {
  grid-template-columns: repeat(7, 1fr);
}

/* Base Converter: 4 columns */
.calc-buttons.converter {
  grid-template-columns: repeat(4, 1fr);
}

.calc-btn {
  padding: 10px 6px;
  font-size: 15px;
  font-weight: 600;
  background: #f8fafc;
  color: var(--color-heading);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
}

.calc-btn:hover {
  background: var(--color-bg-hover);
  transform: translateY(-1px);
}

.calc-btn:active {
  transform: translateY(0);
  background: #e5e7eb;
}

.calc-btn.number {
  background: #fff;
  font-size: 16px;
}

.calc-btn.number:hover {
  background: #f3f4f6;
}

.calc-btn.operator {
  background: #eff6ff;
  color: var(--color-primary);
}

.calc-btn.operator:hover {
  background: #dbeafe;
}

.calc-btn.function {
  background: #f5f3ff;
  color: #7c3aed;
  font-size: 12px;
}

.calc-btn.function:hover {
  background: #ede9fe;
}

.calc-btn.equals {
  background: var(--color-primary);
  color: #fff;
}

.calc-btn.equals:hover {
  background: #1d4ed8;
}

.calc-btn.clear {
  background: #fef2f2;
  color: #dc2626;
}

.calc-btn.clear:hover {
  background: #fee2e2;
}

.calc-btn.secondary {
  background: #f0fdf4;
  color: #16a34a;
  font-size: 11px;
}

.calc-btn.secondary:hover {
  background: #dcfce7;
}

.calc-btn.wide {
  grid-column: span 2;
}

.calc-btn.tall {
  grid-row: span 2;
}

/* Expression Mode Input */
.calc-expression-input {
  width: 100%;
  padding: 12px;
  font-size: 15px;
  font-family: 'Consolas', 'Monaco', monospace;
  background: #1e1e2e;
  color: #cdd6f4;
  border: none;
  border-radius: 8px;
  margin-bottom: 10px;
  box-sizing: border-box;
}

.calc-expression-input:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(37,99,235,0.3);
}

.calc-expression-result {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 12px;
  font-size: 20px;
  font-weight: 600;
  color: #16a34a;
  font-family: 'Consolas', monospace;
  word-break: break-all;
}

.calc-expression-result.error {
  background: #fef2f2;
  border-color: #fecaca;
  color: #dc2626;
}

/* Base Converter Section */
.base-converter-section {
  margin-bottom: 10px;
}

.base-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.base-row label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-heading);
  min-width: 70px;
}

.base-row input {
  flex: 1;
  padding: 10px;
  font-size: 14px;
  font-family: 'Consolas', monospace;
  background: #1e1e2e;
  color: #cdd6f4;
  border: none;
  border-radius: 6px;
}

.base-row input:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(37,99,235,0.3);
}



/* Conversion Steps */
.base-steps {
  background: #f8fafc;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 16px;
  margin-top: 16px;
}

.base-steps h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 12px;
}

.base-steps-content {
  font-size: 13px;
  color: var(--color-text);
  line-height: 1.6;
  font-family: 'Consolas', monospace;
}

/* Keyboard Hint */
.keyboard-hint {
  text-align: center;
  margin-top: 8px;
  font-size: 11px;
  color: var(--color-muted);
}

/* Info Section */
.tool-info {
  margin-top: 32px;
  padding: 24px;
  background: var(--color-bg-card);
  border-radius: 12px;
  border: 1px solid var(--color-border);
}

.tool-info h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 16px;
}

.tool-info p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 12px;
}

.tool-info ul {
  margin: 0 0 16px 24px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
}

.tool-info li {
  margin-bottom: 6px;
}

.tool-info table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
}

.tool-info th,
.tool-info td {
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  text-align: left;
  font-size: 14px;
}

.tool-info th {
  background: var(--color-bg-card);
  font-weight: 600;
}

/* Status Messages */
.error-box {
  padding: 16px 20px;
  margin: 16px 0;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 8px;
  color: #dc2626;
}

.success-box {
  padding: 12px 16px;
  margin: 16px 0;
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 8px;
  color: #16a34a;
  font-weight: 600;
}

/* Two column responsive layout for wide screens */
.two-col-layout {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  margin-bottom: 0;
}

.calc-left-col {
  min-width: 0;
}

.calc-right-col {
  min-width: 0;
}

/* Responsive */
@media (max-width: 960px) {
  .two-col-layout {
    grid-template-columns: 1fr;
  }
  .calc-tabs {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 16px;
  }
  .calc-main-row {
    flex-direction: column;
  }
  .calc-container {
    width: 100%;
    max-width: 360px;
    margin: 0 auto;
  }
  .calc-history-panel {
    width: 100%;
    max-width: 360px;
    margin: 0 auto;
    max-height: 300px;
  }
}

@media (max-width: 600px) {
  .tool-container {
    padding: 16px;
  }
  
  .tool-header h1 {
    font-size: 24px;
  }
  
  .calc-tabs {
    flex-wrap: wrap;
    gap: 6px;
    padding: 8px;
  }
  
  .calc-tab {
    padding: 10px 16px;
    font-size: 13px;
  }
  
  .calc-buttons {
    gap: 6px;
  }
  
  .calc-btn {
  padding: 10px 6px;
  font-size: 15px;
  font-weight: 600;
  background: #f8fafc;
  color: var(--color-heading);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
}
  
  .calc-btn.function {
  background: #f5f3ff;
  color: #7c3aed;
  font-size: 12px;
}
  
  .calc-btn.secondary {
  background: #f0fdf4;
  color: #16a34a;
  font-size: 11px;
}
  
  .calc-display-result {
  font-size: 26px;
  font-weight: 700;
  color: #cdd6f4;
  font-family: 'Consolas', 'Monaco', monospace;
  word-break: break-all;
}
  
  .base-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
  
  .base-row label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-heading);
  min-width: 70px;
}
}

/* Disabled button (for base converter) */
.calc-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  background: #f3f4f6;
  color: #9ca3af;
  transform: none;
}
.calc-btn:disabled:hover {
  background: #f3f4f6;
  transform: none;
}

/* Base button group (replaces select dropdowns) */
.base-btn-group {
  display: flex;
  gap: 4px;
  flex: 1;
}
.base-btn-group .base-btn {
  flex: 1;
  padding: 8px 4px;
  font-size: 12px;
  font-weight: 600;
  background: #fff;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}
.base-btn-group .base-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.base-btn-group .base-btn.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.base-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 6px;
}
.base-section {
  margin-bottom: 10px;
}

/* History Panel */
.calc-history-panel {
  flex: 1;
  min-width: 280px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 14px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  display: flex;
  flex-direction: column;
  max-height: 500px;
}
.calc-history-panel h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
.calc-history-panel h4 button {
  padding: 4px 10px;
  font-size: 11px;
  background: #ef4444;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 500;
}
.calc-history-panel .history-list {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.calc-history-item {
  padding: 8px 10px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}
.calc-history-item:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-primary);
}
.calc-history-item .expr {
  font-size: 11px;
  color: var(--color-muted);
  font-family: 'Consolas', monospace;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.calc-history-item .result {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-heading);
  font-family: 'Consolas', monospace;
  text-align: right;
}
.calc-history-empty {
  text-align: center;
  color: var(--color-muted);
  font-size: 12px;
  padding: 20px 0;
}

/* Calc + history wrapper */
.calc-main-row {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}