/* =========================================
   Mathematics Page - Enhanced Styles
   Interactive and engaging for 8th graders
   ========================================= */

/* =========================================
   Topic Navigation Enhancements
   ========================================= */
.topic-nav {
    position: relative;
    background: var(--bg-secondary);
    padding: var(--spacing-sm);
    border-radius: var(--radius-xl);
    display: inline-flex;
    margin-bottom: var(--spacing-2xl);
}

.topic-btn {
    position: relative;
    z-index: 1;
    padding: var(--spacing-md) var(--spacing-xl);
    background: transparent;
    border-radius: var(--radius-lg);
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.topic-btn:hover {
    color: var(--text-primary);
}

.topic-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-md);
}

/* =========================================
   Interactive Math Tools
   ========================================= */

/* Tool Container */
.math-tool {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
    border: 2px solid var(--border-color);
    transition: all var(--transition-base);
}

.math-tool:hover {
    border-color: var(--mathematics-color);
    box-shadow: var(--shadow-lg);
}

.math-tool h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

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

/* =========================================
   Equation Solver
   ========================================= */
.equation-solver {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.equation-input-group {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.equation-input {
    flex: 1;
    min-width: 200px;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-lg);
    font-family: 'Courier New', monospace;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    transition: all var(--transition-fast);
}

.equation-input:focus {
    outline: none;
    border-color: var(--mathematics-color);
    background: var(--bg-primary);
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1);
}

.equation-input.error {
    border-color: var(--mathematics-color);
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-5px); }
    40%, 80% { transform: translateX(5px); }
}

.solve-btn {
    background: var(--mathematics-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-2xl);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.solve-btn:hover {
    background: #dc2626;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

/* Solution Steps */
.solution-display {
    margin-top: var(--spacing-lg);
}

.solution-display.hidden {
    display: none;
}

.solution-steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.step {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    opacity: 0;
    transform: translateX(-20px);
    animation: slideIn 0.3s ease forwards;
}

.step:nth-child(1) { animation-delay: 0.1s; }
.step:nth-child(2) { animation-delay: 0.2s; }
.step:nth-child(3) { animation-delay: 0.3s; }
.step:nth-child(4) { animation-delay: 0.4s; }
.step:nth-child(5) { animation-delay: 0.5s; }

@keyframes slideIn {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.step-number {
    width: 28px;
    height: 28px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    font-weight: 600;
    flex-shrink: 0;
}

.step-equation {
    font-family: 'Courier New', monospace;
    font-weight: 600;
    font-size: var(--font-size-lg);
    min-width: 180px;
    color: var(--text-primary);
}

.step-explanation {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.step.final {
    background: linear-gradient(135deg, var(--mathematics-color) 0%, #dc2626 100%);
    color: white;
}

.step.final .step-number {
    background: white;
    color: var(--mathematics-color);
}

.step.final .step-equation,
.step.final .step-explanation {
    color: white;
}

/* Quick Examples */
.quick-examples {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.quick-examples p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.example-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.example-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.example-btn:hover {
    background: var(--mathematics-color);
    color: white;
}

/* =========================================
   Interactive PEMDAS
   ========================================= */
.pemdas-interactive {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.pemdas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.pemdas-item {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: 2px solid transparent;
}

.pemdas-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.pemdas-item.active {
    border-color: var(--mathematics-color);
    background: rgba(239, 68, 68, 0.1);
}

.pemdas-item.highlight {
    animation: pulse 0.5s ease;
    background: rgba(239, 68, 68, 0.2);
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.pemdas-letter {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--mathematics-color);
}

.pemdas-word {
    display: block;
    font-weight: 500;
    font-size: var(--font-size-sm);
    margin: var(--spacing-xs) 0;
}

.pemdas-example {
    display: block;
    font-family: monospace;
    color: var(--text-light);
    font-size: var(--font-size-sm);
}

/* PEMDAS Evaluator */
.pemdas-evaluator {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.expression-display {
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-2xl);
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.expression-display .highlight-op {
    background: var(--mathematics-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    animation: highlightPulse 0.5s ease infinite alternate;
}

@keyframes highlightPulse {
    from { opacity: 0.8; }
    to { opacity: 1; }
}

.step-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.step-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.step-btn.primary {
    background: var(--mathematics-color);
    color: white;
}

.step-btn.primary:hover {
    background: #dc2626;
}

.step-btn.secondary {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.step-btn.secondary:hover {
    background: var(--border-color);
}

/* =========================================
   Practice Problem Generator
   ========================================= */
.practice-generator {
    background: linear-gradient(135deg, var(--mathematics-color) 0%, #dc2626 100%);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    color: white;
}

.practice-generator h3 {
    color: white;
}

.difficulty-selector {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.difficulty-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border-radius: var(--radius-full);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.difficulty-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.difficulty-btn.active {
    background: white;
    color: var(--mathematics-color);
}

.problem-area {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.problem-display {
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-lg);
}

.answer-section {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

.answer-field {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-xl);
    font-family: 'Courier New', monospace;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.1);
    color: white;
    width: 120px;
    text-align: center;
}

.answer-field::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.answer-field:focus {
    outline: none;
    border-color: white;
    background: rgba(255, 255, 255, 0.2);
}

.submit-answer {
    padding: var(--spacing-md) var(--spacing-xl);
    background: white;
    color: var(--mathematics-color);
    border-radius: var(--radius-md);
    font-weight: 600;
}

.submit-answer:hover {
    background: var(--bg-secondary);
    transform: translateY(-2px);
}

.feedback-area {
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
}

.feedback-area.correct {
    color: #4ade80;
}

.feedback-area.incorrect {
    color: #fbbf24;
}

/* Stats Bar */
.stats-bar {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.stat-item {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
}

.stat-label {
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

/* =========================================
   Shape Calculator
   ========================================= */
.shape-calculator {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.shape-selector {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.shape-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    min-width: 100px;
    border: 2px solid transparent;
}

.shape-btn:hover {
    background: var(--bg-tertiary);
    transform: translateY(-3px);
}

.shape-btn.active {
    border-color: var(--mathematics-color);
    background: rgba(239, 68, 68, 0.1);
}

.shape-icon {
    font-size: 2.5rem;
}

.shape-btn span:last-child {
    font-weight: 500;
    font-size: var(--font-size-sm);
}

/* Calculator Body */
.calculator-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

@media (max-width: 768px) {
    .calculator-body {
        grid-template-columns: 1fr;
    }
}

.input-section {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
}

.input-group {
    margin-bottom: var(--spacing-md);
}

.input-group label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
}

.dimension-input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
}

.dimension-input:focus {
    outline: none;
    border-color: var(--mathematics-color);
}

/* Visual Section */
.visual-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
}

.shape-visual-container {
    position: relative;
    width: 200px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.animated-shape {
    transition: all var(--transition-base);
}

.animated-shape.rectangle {
    width: 150px;
    height: 100px;
    background: linear-gradient(135deg, var(--mathematics-color) 0%, #f87171 100%);
    border-radius: var(--radius-sm);
}

.animated-shape.triangle {
    width: 0;
    height: 0;
    border-left: 75px solid transparent;
    border-right: 75px solid transparent;
    border-bottom: 130px solid var(--mathematics-color);
}

.animated-shape.circle {
    width: 150px;
    height: 150px;
    background: linear-gradient(135deg, var(--mathematics-color) 0%, #f87171 100%);
    border-radius: 50%;
}

/* Results Display */
.results-display {
    width: 100%;
}

.result-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm);
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-xs);
}

.result-row .label {
    color: var(--text-secondary);
}

.result-row .value {
    font-weight: 600;
    color: var(--mathematics-color);
    font-family: 'Courier New', monospace;
}

/* =========================================
   Pythagorean Theorem Visualizer
   ========================================= */
.pythagorean-visualizer {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
}

.visualizer-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

@media (max-width: 768px) {
    .visualizer-container {
        grid-template-columns: 1fr;
    }
}

.triangle-visual {
    position: relative;
    width: 280px;
    height: 280px;
    margin: 0 auto;
}

.triangle-svg {
    width: 100%;
    height: 100%;
}

.triangle-svg .triangle-path {
    fill: rgba(239, 68, 68, 0.1);
    stroke: var(--mathematics-color);
    stroke-width: 3;
}

.triangle-svg .square-a,
.triangle-svg .square-b,
.triangle-svg .square-c {
    opacity: 0.3;
    transition: opacity var(--transition-base);
}

.triangle-svg .square-a { fill: #3b82f6; }
.triangle-svg .square-b { fill: #10b981; }
.triangle-svg .square-c { fill: var(--mathematics-color); }

.triangle-svg.show-squares .square-a,
.triangle-svg.show-squares .square-b,
.triangle-svg.show-squares .square-c {
    opacity: 0.6;
}

.triangle-svg .side-label {
    font-family: 'Courier New', monospace;
    font-weight: 600;
    font-size: 14px;
}

.pythagorean-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.side-inputs {
    display: grid;
    gap: var(--spacing-md);
}

.side-input-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.side-label-box {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: white;
    border-radius: var(--radius-md);
}

.side-label-box.a { background: #3b82f6; }
.side-label-box.b { background: #10b981; }
.side-label-box.c { background: var(--mathematics-color); }

.side-input {
    flex: 1;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
}

.side-input:focus {
    outline: none;
    border-color: var(--mathematics-color);
}

.calculate-hypotenuse {
    background: var(--mathematics-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    width: 100%;
}

.calculate-hypotenuse:hover {
    background: #dc2626;
}

.theorem-result {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
}

.theorem-equation {
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.theorem-explanation {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.toggle-squares {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
}

.toggle-squares:hover {
    background: var(--border-color);
}

/* =========================================
   Angle Explorer
   ========================================= */
.angle-explorer {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
}

.angle-visualizer {
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}

.angle-canvas-container {
    position: relative;
    width: 250px;
    height: 250px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

#angleCanvas {
    width: 100%;
    height: 100%;
}

.angle-controls {
    flex: 1;
    min-width: 250px;
}

.angle-slider-group {
    margin-bottom: var(--spacing-lg);
}

.angle-slider-group label {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.angle-value {
    color: var(--mathematics-color);
    font-weight: 700;
}

.angle-slider {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    outline: none;
}

.angle-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    background: var(--mathematics-color);
    border-radius: 50%;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.angle-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.angle-type-display {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
}

.angle-type-name {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--mathematics-color);
    margin-bottom: var(--spacing-xs);
}

.angle-type-desc {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* Quick angle buttons */
.quick-angles {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-top: var(--spacing-md);
}

.quick-angle-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

.quick-angle-btn:hover {
    background: var(--mathematics-color);
    color: white;
}

/* =========================================
   Statistics Calculator Enhanced
   ========================================= */
.stats-calculator {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.data-input-area {
    margin-bottom: var(--spacing-xl);
}

.data-input-area label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.data-input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: 'Courier New', monospace;
}

.data-input:focus {
    outline: none;
    border-color: var(--mathematics-color);
}

.data-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.random-data-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
}

.random-data-btn:hover {
    background: var(--border-color);
}

.stats-results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.stat-card .stat-icon {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.stat-card .stat-label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.stat-card .stat-value {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--mathematics-color);
    font-family: 'Courier New', monospace;
}

/* Data Visualization */
.data-visualization {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.chart-container {
    height: 200px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
}

.chart-bar {
    width: 30px;
    background: linear-gradient(to top, var(--mathematics-color), #f87171);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    transition: height var(--transition-base);
    position: relative;
}

.chart-bar:hover {
    background: linear-gradient(to top, #dc2626, var(--mathematics-color));
}

.chart-bar::after {
    content: attr(data-value);
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

/* =========================================
   Probability Simulator
   ========================================= */
.probability-simulator {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
}

.simulator-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.sim-tab {
    flex: 1;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    text-align: center;
    font-weight: 500;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

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

.sim-tab.active {
    background: var(--mathematics-color);
    color: white;
}

.sim-tab .tab-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: var(--spacing-xs);
}

/* Dice Simulator */
.dice-simulator,
.coin-simulator {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
}

.dice-container {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.dice {
    width: 80px;
    height: 80px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    transition: transform var(--transition-fast);
}

.dice.rolling {
    animation: rollDice 0.5s ease;
}

@keyframes rollDice {
    0% { transform: rotateX(0) rotateY(0); }
    25% { transform: rotateX(90deg) rotateY(90deg); }
    50% { transform: rotateX(180deg) rotateY(180deg); }
    75% { transform: rotateX(270deg) rotateY(270deg); }
    100% { transform: rotateX(360deg) rotateY(360deg); }
}

.roll-btn {
    display: block;
    margin: 0 auto var(--spacing-xl);
    padding: var(--spacing-md) var(--spacing-2xl);
    background: var(--mathematics-color);
    color: white;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.roll-btn:hover {
    background: #dc2626;
    transform: translateY(-2px);
}

.probability-stats {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--spacing-sm);
}

.prob-stat {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
}

.prob-stat .dice-face {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.prob-stat .count {
    font-weight: 700;
    color: var(--mathematics-color);
}

.prob-stat .percent {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Coin Simulator */
.coin-container {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.coin {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(145deg, #ffd700, #ffb347);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    font-weight: 700;
    color: #8b6914;
    transition: transform var(--transition-fast);
}

.coin.flipping {
    animation: flipCoin 0.6s ease;
}

@keyframes flipCoin {
    0% { transform: rotateY(0); }
    100% { transform: rotateY(720deg); }
}

.coin-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    max-width: 400px;
    margin: 0 auto;
}

.coin-stat {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
}

.coin-stat .face {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.coin-stat .count {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--mathematics-color);
}

.coin-stat .percent {
    color: var(--text-secondary);
}

/* Simulator Reset */
.reset-sim {
    display: block;
    margin: var(--spacing-lg) auto 0;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
}

.reset-sim:hover {
    background: var(--border-color);
}

/* =========================================
   Achievement Badges
   ========================================= */
.achievements-section {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.achievements-section h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.badges-container {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-full);
    border: 2px solid var(--border-color);
    transition: all var(--transition-fast);
    opacity: 0.5;
}

.badge.earned {
    opacity: 1;
    border-color: var(--mathematics-color);
    background: rgba(239, 68, 68, 0.1);
}

.badge.earned .badge-icon {
    animation: bounce 0.5s ease;
}

@keyframes bounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

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

.badge-name {
    font-weight: 500;
    font-size: var(--font-size-sm);
}

/* =========================================
   Loading States
   ========================================= */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* =========================================
   Toast Notifications
   ========================================= */
.toast-container {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    animation: slideInRight 0.3s ease, fadeOut 0.3s ease 2.7s forwards;
    max-width: 300px;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

.toast.success {
    background: var(--science-color);
}

.toast.error {
    background: var(--mathematics-color);
}

.toast.info {
    background: var(--technology-color);
}

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

/* =========================================
   Responsive Adjustments
   ========================================= */
@media (max-width: 768px) {
    .equation-input-group {
        flex-direction: column;
    }
    
    .visualizer-container,
    .calculator-body {
        grid-template-columns: 1fr;
    }
    
    .triangle-visual {
        width: 100%;
        max-width: 280px;
    }
    
    .probability-stats {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .step {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    .step-equation {
        min-width: auto;
    }
    
    .answer-section {
        flex-direction: column;
    }
    
    .answer-field {
        width: 100%;
    }
    
    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
    }
    
    .toast {
        max-width: none;
    }
}

@media (max-width: 480px) {
    .stats-bar {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .badges-container {
        justify-content: center;
    }
    
    .difficulty-selector {
        flex-direction: column;
    }
    
    .difficulty-btn {
        width: 100%;
    }
}