/**
 * Scientific Calculator - GreenGetWare Theme
 */

:root {
  --primary: #39d353;
  --primary-dark: #176f3c;
  --primary-hover: #2fb344;
  --primary-light: rgba(57, 211, 83, 0.15);
  --primary-gradient: linear-gradient(135deg, #39d353 0%, #176f3c 100%);
  --accent: #00c9ff;
  --secondary: #64748b;
  --success: #39d353;
  --warning: #f59e0b;
  --danger: #ef4444;
  
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #252540;
  --bg-card: rgba(26, 26, 46, 0.95);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: rgba(255, 255, 255, 0.08);
  
  --key-bg: #252540;
  --key-hover: #2f2f4a;
  --key-active: #3a3a5a;
  --key-number: #2a2a44;
  --key-operator: #39d353;
  --key-function: #1e1e36;
  
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 60px rgba(57, 211, 83, 0.2);
  
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.95);
  --text-primary: #1a1a2e;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border-color: rgba(0, 0, 0, 0.08);
  --key-bg: #e2e8f0;
  --key-hover: #cbd5e1;
  --key-active: #94a3b8;
  --key-number: #f1f5f9;
  --key-function: #e2e8f0;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.text-gradient {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Header */
.app-header {
  background: var(--bg-card);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: var(--space-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand-section {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.logo i {
  color: var(--primary);
  font-size: 1.75rem;
}

.brand-badge {
  font-size: 0.6875rem;
  color: var(--text-muted);
  font-weight: 500;
}

.header-actions {
  display: flex;
  gap: var(--space-sm);
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--bg-tertiary);
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background: var(--primary);
  color: white;
}

.btn-icon.active {
  background: var(--primary);
  color: white;
}

.btn-home {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--primary-gradient);
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 4px 15px rgba(57, 211, 83, 0.3);
  transition: all var(--transition-fast);
}

.btn-home:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(57, 211, 83, 0.4);
  color: white;
}

.btn-home span {
  display: none;
}

@media (min-width: 768px) {
  .btn-home span {
    display: inline;
  }
}

/* Main Content */
.main-content {
  padding: var(--space-xl) 0;
}

/* Calculator Wrapper */
.calculator-wrapper {
  max-width: 500px;
  margin: 0 auto;
  position: relative;
}

/* Mode Tabs */
.mode-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.mode-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-xs);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mode-tab i {
  font-size: 1.25rem;
}

.mode-tab:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.mode-tab.active {
  background: var(--primary-gradient);
  border-color: transparent;
  color: white;
}

/* Calculator Body */
.calculator-body {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: var(--space-lg);
  box-shadow: var(--shadow-lg);
}

/* Display Section */
.display-section {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  min-height: 100px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  position: relative;
  border: 1px solid var(--border-color);
}

.expression {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  color: var(--text-muted);
  text-align: right;
  min-height: 24px;
  word-break: break-all;
  margin-bottom: var(--space-xs);
}

.result {
  font-family: 'JetBrains Mono', monospace;
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: right;
  word-break: break-all;
  line-height: 1.2;
}

.memory-indicator {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  font-size: 0.75rem;
  color: var(--primary);
  font-weight: 600;
}

/* Programmer Display */
.programmer-display {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  border: 1px solid var(--border-color);
}

.base-row {
  display: flex;
  align-items: center;
  padding: var(--space-xs) 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8125rem;
}

.base-label {
  min-width: 40px;
  color: var(--primary);
  font-weight: 600;
}

.base-value {
  flex: 1;
  text-align: right;
  color: var(--text-secondary);
  word-break: break-all;
}

/* Converter Panel */
.converter-panel {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  border: 1px solid var(--border-color);
}

.converter-type {
  margin-bottom: var(--space-md);
}

.converter-type select,
.converter-input-group select {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
}

.converter-inputs {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.converter-input-group {
  display: flex;
  gap: var(--space-sm);
}

.converter-input-group input {
  flex: 1;
  padding: var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
}

.converter-input-group input:focus {
  outline: none;
  border-color: var(--primary);
}

.converter-input-group select {
  width: 120px;
  flex-shrink: 0;
}

.converter-arrow {
  text-align: center;
  color: var(--primary);
  font-size: 1.25rem;
}

.swap-btn {
  width: 100%;
  margin-top: var(--space-md);
  padding: var(--space-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.875rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  transition: all var(--transition-fast);
}

.swap-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* Keypad */
.keypad {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.keypad-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-sm);
}

.keypad-row.memory-row {
  grid-template-columns: repeat(5, 1fr);
}

.keypad-row.trig-row {
  grid-template-columns: repeat(6, 1fr);
}

.keypad-row.base-select-row {
  margin-bottom: var(--space-sm);
}

/* Keys */
.key {
  padding: var(--space-md);
  background: var(--key-bg);
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  user-select: none;
}

.key:hover {
  background: var(--key-hover);
}

.key:active {
  background: var(--key-active);
  transform: scale(0.95);
}

.key.number {
  background: var(--key-number);
  font-family: 'JetBrains Mono', monospace;
}

.key.operator {
  background: var(--primary);
  color: white;
}

.key.operator:hover {
  background: var(--primary-hover);
}

.key.equals {
  background: var(--primary-gradient);
  color: white;
  font-size: 1.5rem;
}

.key.equals:hover {
  opacity: 0.9;
}

.key.function {
  background: var(--key-function);
  color: var(--text-secondary);
  font-size: 1rem;
}

.key.memory {
  background: var(--key-function);
  color: var(--text-muted);
  font-size: 0.8125rem;
  min-height: 40px;
  padding: var(--space-sm);
}

.key.memory:hover {
  color: var(--primary);
}

.key.sci {
  background: var(--key-function);
  color: var(--accent);
  font-size: 0.875rem;
  min-height: 48px;
}

.key.prog {
  background: var(--key-function);
  color: var(--warning);
  font-size: 0.75rem;
  min-height: 48px;
}

.key.hex-key {
  background: var(--key-function);
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
}

.key.hex-key:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.key.base-btn {
  font-size: 0.875rem;
  min-height: 40px;
}

.key.base-btn.active {
  background: var(--primary);
  color: white;
}

/* Scientific Keypad */
.scientific-keypad .keypad-row {
  grid-template-columns: repeat(5, 1fr);
}

/* Programmer Keypad */
.programmer-keypad .keypad-row {
  grid-template-columns: repeat(5, 1fr);
}

/* History Panel */
.history-panel {
  position: absolute;
  top: 0;
  right: -320px;
  width: 300px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  max-height: 500px;
  display: none;
}

.history-panel.open {
  display: block;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md);
  border-bottom: 1px solid var(--border-color);
}

.history-header h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.history-header h4 i {
  color: var(--primary);
}

.clear-history {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.75rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.clear-history:hover {
  color: var(--danger);
}

.history-list {
  padding: var(--space-md);
  max-height: 400px;
  overflow-y: auto;
}

.history-empty {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
  padding: var(--space-lg);
}

.history-item {
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  margin-bottom: var(--space-sm);
  transition: background var(--transition-fast);
}

.history-item:hover {
  background: var(--bg-tertiary);
}

.history-expression {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}

.history-result {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
}

/* Features Section */
.features-section {
  margin-top: var(--space-2xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--border-color);
}

.features-section h2 {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-xl);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
}

.feature-icon {
  width: 60px;
  height: 60px;
  background: var(--primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-md);
}

.feature-icon i {
  font-size: 1.75rem;
  color: var(--primary);
}

.feature-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Footer */
.app-footer {
  padding: var(--space-xl) 0;
  text-align: center;
  border-top: 1px solid var(--border-color);
  margin-top: var(--space-2xl);
}

.app-footer p {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 900px) {
  .history-panel {
    position: fixed;
    top: 50%;
    left: 50%;
    right: auto;
    transform: translate(-50%, -50%);
    z-index: 200;
  }
}

@media (max-width: 540px) {
  .calculator-body {
    padding: var(--space-md);
  }
  
  .key {
    min-height: 48px;
    padding: var(--space-sm);
    font-size: 1.125rem;
  }
  
  .key.sci,
  .key.prog {
    font-size: 0.6875rem;
    min-height: 40px;
  }
  
  .keypad-row.trig-row {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .result {
    font-size: 2rem;
  }
  
  .mode-tab span {
    display: none;
  }
  
  .mode-tab i {
    font-size: 1.5rem;
  }
}