/* ==========================================================================
   Grap-Calc-v1.1 Main Stylesheet
   Advanced Graphing Calculator Web Application
   ========================================================================== */

/* CSS Custom Properties (CSS Variables) */
:root {
  /* Color Palette */
  --color-primary: #007aff;
  --color-secondary: #34c759;
  --color-accent: #ff9500;
  --color-danger: #ff3b30;
  --color-warning: #ffcc00;
  
  /* Neutral Colors */
  --color-white: #ffffff;
  --color-black: #000000;
  --color-gray-50: #f9f9f9;
  --color-gray-100: #f3f3f4;
  --color-gray-200: #e5e5e7;
  --color-gray-300: #d1d1d6;
  --color-gray-400: #8e8e93;
  --color-gray-500: #636366;
  --color-gray-600: #48484a;
  --color-gray-700: #3a3a3c;
  --color-gray-800: #2c2c2e;
  --color-gray-900: #1c1c1e;
  
  /* Calculator Specific Colors - TI-84 Inspired */
  --calc-bg: #1a1a1a;
  --calc-display-bg: #000000;
  --calc-button-bg: #2a2a2a;
  --calc-button-hover: #3a3a3a;
  --calc-button-active: #4a4a4a;
  --calc-number-color: var(--color-white);
  --calc-operator-bg: #0052cc;
  --calc-function-bg: #1a4d80;
  --calc-function-secondary: #4a4a4a;
  --calc-math-bg: #1a4d80;
  --calc-equals-bg: #006600;
  --calc-variable-bg: #cc6600;
  --calc-clear-bg: #cc0000;
  
  /* Graph Colors */
  --graph-bg: var(--color-white);
  --graph-grid: #e0e0e0;
  --graph-axis: #333333;
  --graph-function-1: #ff0000;
  --graph-function-2: #0000ff;
  --graph-function-3: #00aa00;
  --graph-function-4: #ff8800;
  --graph-function-5: #8800ff;
  --graph-function-6: #00ffff;
  --graph-function-7: #ff00ff;
  --graph-function-8: #888800;
  --graph-function-9: #008888;
  --graph-function-10: #880088;
  
  /* Typography */
  --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', 'Dank Mono', 'Operator Mono', monospace;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 50%;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* ==========================================================================
   Reset and Base Styles
   ========================================================================== */

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

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

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--color-gray-900);
  background-color: var(--color-gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   Layout Components
   ========================================================================== */

.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  max-width: 1400px;
  margin: 0 auto;
  background-color: var(--color-white);
  box-shadow: var(--shadow-lg);
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-primary), #005cc8);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.app-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin: 0;
}

.header-controls {
  display: flex;
  gap: var(--spacing-sm);
}

.theme-toggle,
.help-button {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: var(--radius-full);
  background-color: rgba(255, 255, 255, 0.2);
  color: var(--color-white);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast);
}

.theme-toggle:hover,
.help-button:hover {
  background-color: rgba(255, 255, 255, 0.3);
}

/* Main Content */
.main-content {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  min-height: 0;
}

/* ==========================================================================
   Calculator Section
   ========================================================================== */

.calculator-section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  background-color: var(--calc-bg);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-lg);
  max-height: fit-content;
  border: 3px solid #333333;
  position: relative;
}

.calculator-section::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(145deg, #444444, #111111);
  border-radius: calc(var(--radius-xl) + 2px);
  z-index: -1;
}

/* Display Container */
.display-container {
  background-color: var(--calc-display-bg);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.display-screen {
  min-height: 120px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: #00ff00;
  background: radial-gradient(ellipse at center, #002200 0%, #000000 70%);
  border: 2px inset #333333;
  border-radius: 4px;
  padding: var(--spacing-md);
  font-family: 'Courier New', monospace;
  position: relative;
}

.display-screen::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 255, 0, 0.03) 2px,
    rgba(0, 255, 0, 0.03) 4px
  );
  pointer-events: none;
  border-radius: 2px;
}

.calculation-history {
  color: var(--color-gray-400);
  font-size: var(--font-size-sm);
  font-family: var(--font-family-mono);
  min-height: 20px;
  margin-bottom: var(--spacing-sm);
}

.current-input {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-light);
  font-family: var(--font-family-mono);
  text-align: right;
  line-height: 1.2;
  word-break: break-all;
}

.result-display {
  color: var(--color-gray-300);
  font-size: var(--font-size-lg);
  font-family: var(--font-family-mono);
  text-align: right;
  margin-top: var(--spacing-xs);
  min-height: 24px;
}

.equation-editor {
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-gray-600);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm);
  color: var(--color-white);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-base);
  min-height: 40px;
  margin-top: var(--spacing-md);
  outline: none;
  transition: border-color var(--transition-fast);
}

.equation-editor:focus {
  border-color: var(--color-primary);
}

.equation-editor[contenteditable]:empty::before {
  content: attr(placeholder);
  color: var(--color-gray-500);
  pointer-events: none;
}

/* Mode Selector */
.mode-selector {
  display: flex;
  background-color: var(--color-gray-700);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--spacing-md);
}

.mode-tab {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  background-color: transparent;
  color: var(--color-gray-300);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mode-tab:hover {
  background-color: var(--color-gray-600);
  color: var(--color-white);
}

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

/* Button Grid */
.button-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.button-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
  margin-bottom: 4px;
}

.calc-button {
  height: 48px;
  border: 2px outset #555555;
  border-radius: 6px;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  font-family: var(--font-family-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  outline: none;
  position: relative;
  overflow: hidden;
  text-shadow: 1px 1px 1px rgba(0, 0, 0, 0.5);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4px;
}

.calc-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-fast);
}

.calc-button:hover::before {
  left: 100%;
}

.calc-button:active {
  transform: translateY(1px);
  border-style: inset;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3), inset 0 1px 3px rgba(0, 0, 0, 0.3);
}

/* Button Types - TI-84 Style */
.number-btn {
  background: linear-gradient(145deg, #404040, #2a2a2a);
  color: var(--calc-number-color);
  border-color: #555555;
}

.number-btn:hover {
  background: linear-gradient(145deg, #505050, #3a3a3a);
}

.operator-btn {
  background: linear-gradient(145deg, #0066ff, #0052cc);
  color: var(--color-white);
  border-color: #0077ff;
}

.operator-btn:hover {
  background: linear-gradient(145deg, #0077ff, #0056d3);
}

.function-btn {
  background: linear-gradient(145deg, #2a5a99, #1a4d80);
  color: var(--color-white);
  font-size: 0.8rem;
  font-weight: var(--font-weight-bold);
  border-color: #4a7ab3;
}

.function-btn:hover {
  background: linear-gradient(145deg, #3a6aa9, #2a5d90);
}

.math-btn {
  background: linear-gradient(145deg, #2a5a99, #1a4d80);
  color: var(--color-white);
  border-color: #4a7ab3;
}

.math-btn:hover {
  background: linear-gradient(145deg, #3a6aa9, #2a5d90);
}

.secondary-btn {
  background: linear-gradient(145deg, #666666, #4a4a4a);
  color: var(--color-white);
  font-size: 0.8rem;
  font-weight: var(--font-weight-bold);
  border-color: #777777;
}

.secondary-btn:hover {
  background: linear-gradient(145deg, #777777, #5a5a5a);
}

.variable-btn {
  background: linear-gradient(145deg, #ff8800, #cc6600);
  color: var(--color-white);
  font-weight: var(--font-weight-bold);
  border-color: #ff9900;
  font-size: 1.1rem;
}

.variable-btn:hover {
  background: linear-gradient(145deg, #ff9900, #e6850e);
}

.equals-btn {
  background: linear-gradient(145deg, #009900, #006600);
  color: var(--color-white);
  grid-column: span 2;
  font-weight: var(--font-weight-bold);
  border-color: #00aa00;
  font-size: 1.1rem;
}

.equals-btn:hover {
  background: linear-gradient(145deg, #00aa00, #2da946);
}

.zero-btn {
  grid-column: span 2;
}

/* Special button for CLEAR */
.calc-button[data-action="clear"] {
  background: linear-gradient(145deg, #ff4444, #cc0000);
  color: var(--color-white);
  border-color: #ff5555;
  font-weight: var(--font-weight-bold);
}

.calc-button[data-action="clear"]:hover {
  background: linear-gradient(145deg, #ff5555, #dd1111);
}

/* TI-84 Style Function Labels */
.calc-button {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.primary-function {
  font-size: 0.9rem;
  font-weight: var(--font-weight-bold);
  line-height: 1;
}

.secondary-function {
  font-size: 0.6rem;
  font-weight: var(--font-weight-normal);
  color: rgba(255, 255, 255, 0.7);
  position: absolute;
  top: 2px;
  left: 2px;
  line-height: 1;
  text-shadow: none;
}

/* Different positioning for different button types */
.function-btn .secondary-function {
  color: rgba(255, 255, 255, 0.6);
}

.math-btn .secondary-function {
  color: rgba(255, 255, 255, 0.6);
}

.variable-btn .secondary-function {
  color: rgba(255, 255, 255, 0.7);
}

/* Button hover effects for secondary functions */
.calc-button:hover .secondary-function {
  color: rgba(255, 255, 255, 0.9);
}

/* 2nd function mode (when 2nd button is pressed) */
body.second-function-mode .calc-button .primary-function {
  opacity: 0.3;
}

body.second-function-mode .calc-button .secondary-function {
  font-size: 0.9rem;
  font-weight: var(--font-weight-bold);
  color: #ffff00;
  position: static;
  text-shadow: 1px 1px 1px rgba(0, 0, 0, 0.5);
}

/* Alpha mode styling */
body.alpha-mode .calc-button .primary-function {
  opacity: 0.3;
}

body.alpha-mode .calc-button[data-variable] .primary-function {
  color: #00ff00;
  opacity: 1;
}

/* Special styling for important buttons */
.calc-button[data-action="2nd"] {
  background: linear-gradient(145deg, #ffaa00, #cc8800);
  color: #000000;
  font-weight: var(--font-weight-bold);
}

.calc-button[data-action="2nd"]:hover {
  background: linear-gradient(145deg, #ffbb11, #dd9911);
}

.calc-button[data-action="alpha"] {
  background: linear-gradient(145deg, #00aa00, #008800);
  color: var(--color-white);
  font-weight: var(--font-weight-bold);
}

.calc-button[data-action="alpha"]:hover {
  background: linear-gradient(145deg, #00bb00, #009900);
}

/* Pressed state for 2nd and alpha buttons */
.calc-button[data-action="2nd"].active {
  background: linear-gradient(145deg, #cc8800, #aa6600);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

.calc-button[data-action="alpha"].active {
  background: linear-gradient(145deg, #008800, #006600);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* ==========================================================================
   Graphing Section
   ========================================================================== */

.graphing-section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  background-color: var(--color-white);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

/* Graph Controls */
.graph-controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  align-items: center;
  padding: var(--spacing-md);
  background-color: var(--color-gray-50);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-gray-200);
}

.control-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.control-group label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-700);
  white-space: nowrap;
}

.control-group input {
  width: 80px;
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-family: var(--font-family-mono);
}

.control-button {
  padding: var(--spacing-xs) var(--spacing-md);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-sm);
  background-color: var(--color-white);
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.control-button:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* Graph Container */
.graph-container {
  position: relative;
  flex: 1;
  background-color: var(--graph-bg);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 400px;
}

#graphCanvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
}

.graph-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: var(--z-dropdown);
}

.coordinate-display {
  position: absolute;
  top: var(--spacing-sm);
  left: var(--spacing-sm);
  background-color: rgba(0, 0, 0, 0.8);
  color: var(--color-white);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
}

.trace-info {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  background-color: rgba(0, 0, 0, 0.8);
  color: var(--color-white);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
}

/* Function List */
.function-list {
  background-color: var(--color-gray-50);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  border: 1px solid var(--color-gray-200);
}

.function-list h3 {
  margin: 0 0 var(--spacing-md) 0;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-800);
}

.function-entries {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.function-entry {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background-color: var(--color-white);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-gray-200);
}

.function-color {
  width: 20px;
  height: 20px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--color-gray-300);
  cursor: pointer;
}

.function-color[data-color="red"] { background-color: var(--graph-function-1); }
.function-color[data-color="blue"] { background-color: var(--graph-function-2); }
.function-color[data-color="green"] { background-color: var(--graph-function-3); }

.function-input {
  flex: 1;
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
}

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

.add-function-btn {
  width: 100%;
  padding: var(--spacing-sm);
  border: 2px dashed var(--color-gray-300);
  border-radius: var(--radius-sm);
  background-color: transparent;
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

/* ==========================================================================
   Data Section
   ========================================================================== */

.data-section {
  grid-column: 1 / -1;
  background-color: var(--color-white);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-lg);
}

.table-container {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-gray-200);
  margin-bottom: var(--spacing-md);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
}

.data-table th,
.data-table td {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: center;
  border-bottom: 1px solid var(--color-gray-200);
}

.data-table th {
  background-color: var(--color-gray-50);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-800);
}

.data-table tr:hover {
  background-color: var(--color-gray-50);
}

.table-controls {
  display: flex;
  gap: var(--spacing-sm);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.app-footer {
  text-align: center;
  padding: var(--spacing-md);
  background-color: var(--color-gray-100);
  color: var(--color-gray-600);
  font-size: var(--font-size-sm);
  border-top: 1px solid var(--color-gray-200);
}

/* ==========================================================================
   Modal and Loading Components
   ========================================================================== */

.loading-indicator {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top: 4px solid var(--color-white);
  border-radius: var(--radius-full);
  animation: spin 1s linear infinite;
  margin-bottom: var(--spacing-md);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-indicator p {
  color: var(--color-white);
  font-size: var(--font-size-lg);
}

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
}

.modal-content {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  max-width: 90vw;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
}

/* Mode settings modal styles */
.mode-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 15px 0;
}

.mode-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--color-gray-300);
  border-radius: 6px;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.mode-option:hover {
  background-color: var(--color-gray-50);
}

.mode-option input[type="radio"] {
  margin: 0;
}

.mode-option span {
  font-weight: var(--font-weight-medium);
}

/* Mathematical Analysis Modal Styles */
.math-menu {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin: 20px 0;
}

.math-section {
  border: 1px solid var(--color-gray-300);
  border-radius: 8px;
  padding: 15px;
}

.math-section h4 {
  margin: 0 0 10px 0;
  color: var(--color-primary);
  font-size: var(--font-size-lg);
}

.math-btn {
  display: block;
  width: 100%;
  padding: 10px 15px;
  margin: 5px 0;
  border: 1px solid var(--color-primary);
  border-radius: 6px;
  background-color: var(--color-white);
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

/* Settings dialog styles */
.window-settings,
.intersection-settings,
.zero-settings,
.derivative-settings,
.integral-settings {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin: 20px 0;
}

.setting-group {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.setting-group label {
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-700);
  min-width: 100px;
}

.setting-group input,
.setting-group select {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--color-gray-300);
  border-radius: 4px;
  font-size: var(--font-size-sm);
}

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

.preset-buttons {
  display: flex;
  gap: 10px;
  margin: 15px 0;
}

.preset-btn {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--color-gray-400);
  border-radius: 4px;
  background-color: var(--color-gray-100);
  color: var(--color-gray-700);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preset-btn:hover {
  background-color: var(--color-gray-200);
  border-color: var(--color-gray-500);
}

/* Results display styles */
.results-area {
  margin-top: 20px;
  padding: 15px;
  background-color: var(--color-gray-50);
  border-radius: 8px;
  border: 1px solid var(--color-gray-200);
}

.results-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.result-item {
  padding: 12px;
  background-color: var(--color-white);
  border-radius: 6px;
  border: 1px solid var(--color-gray-300);
  font-family: var(--font-family-mono);
}

.result-item strong {
  color: var(--color-primary);
  font-weight: var(--font-weight-bold);
}

.result-item small {
  color: var(--color-gray-600);
  font-size: var(--font-size-xs);
}

/* Function table styles */
.function-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 15px;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  max-height: 400px;
  overflow-y: auto;
  display: block;
}

.function-table thead {
  display: table-header-group;
  position: sticky;
  top: 0;
  background-color: var(--color-gray-100);
}

.function-table tbody {
  display: table-row-group;
  max-height: 350px;
  overflow-y: auto;
}

.function-table th,
.function-table td {
  padding: 8px 12px;
  text-align: center;
  border: 1px solid var(--color-gray-300);
}

.function-table th {
  background-color: var(--color-gray-100);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-800);
}

.function-table tr:nth-child(even) {
  background-color: var(--color-gray-50);
}

.function-table tr:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.table-controls {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
  justify-content: flex-end;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

@media (max-width: 1024px) {
  .main-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .calculator-section {
    order: 2;
  }
  
  .graphing-section {
    order: 1;
  }
}

@media (max-width: 768px) {
  .app-header {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .app-title {
    font-size: var(--font-size-xl);
  }
  
  .main-content {
    padding: var(--spacing-md);
  }
  
  .button-row {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .calc-button {
    height: 45px;
    font-size: var(--font-size-sm);
  }
  
  .graph-controls {
    flex-direction: column;
    align-items: stretch;
  }
  
  .control-group {
    justify-content: space-between;
  }
}

@media (max-width: 480px) {
  .current-input {
    font-size: var(--font-size-2xl);
  }
  
  .calc-button {
    height: 40px;
    font-size: var(--font-size-xs);
  }
  
  .function-btn {
    font-size: var(--font-size-xs);
  }
  
  .secondary-btn {
    font-size: var(--font-size-xs);
  }
}

/* ==========================================================================
   Accessibility
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus styles for keyboard navigation */
.calc-button:focus,
.control-button:focus,
.mode-tab:focus,
.function-input:focus,
.equation-editor:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-gray-300: #000000;
    --color-gray-400: #000000;
    --color-gray-500: #000000;
    --calc-button-bg: #ffffff;
    --calc-number-color: #000000;
  }
}