/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Courier New', monospace;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a0a1a 50%, #0a1a1a 100%);
    color: #00ffff;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

/* Background effects */
.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(0, 255, 255, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 255, 255, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: 1;
    pointer-events: none;
}

.bg-scanlines {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 255, 255, 0.03) 2px,
        rgba(0, 255, 255, 0.03) 4px
    );
    z-index: 2;
    pointer-events: none;
    animation: scanlines 10s linear infinite;
}

@keyframes scanlines {
    0% { transform: translateY(0); }
    100% { transform: translateY(50px); }
}

.bg-particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: #00ffff;
    border-radius: 50%;
    opacity: 0.6;
    animation: float 15s linear infinite;
}

@keyframes float {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 0.6;
    }
    90% {
        opacity: 0.6;
    }
    100% {
        transform: translateY(-100px) rotate(360deg);
        opacity: 0;
    }
}

/* Main container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    position: relative;
    z-index: 10;
}

/* Header styles */
.game-header {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

.title {
    font-size: 4rem;
    font-weight: bold;
    text-shadow: 0 0 20px currentColor;
    margin-bottom: 0.5rem;
    letter-spacing: 0.2em;
}

.cyber-text {
    color: #ff00ff;
    text-shadow: 0 0 30px #ff00ff;
}

.math-text {
    color: #00ff00;
    text-shadow: 0 0 30px #00ff00;
}

.subtitle {
    font-size: 1.2rem;
    color: #888;
    letter-spacing: 0.3em;
    text-transform: uppercase;
}

/* Configuration sections */
.config-panel {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.config-section {
    background: rgba(0, 255, 255, 0.05);
    border: 1px solid rgba(0, 255, 255, 0.3);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: inset 0 0 30px rgba(0, 255, 255, 0.1);
}

.section-title {
    font-size: 1.5rem;
    color: #00ffff;
    text-align: center;
    margin-bottom: 1.5rem;
    letter-spacing: 0.1em;
    text-shadow: 0 0 10px currentColor;
}

/* Option grid */
.option-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

/* Option boxes */
.option-box {
    background: linear-gradient(145deg, rgba(0, 0, 0, 0.8), rgba(20, 20, 20, 0.8));
    border: 2px solid rgba(0, 255, 255, 0.4);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.option-box::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, #00ffff, #ff00ff, #00ff00, #ffff00);
    z-index: -1;
    border-radius: 8px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.option-box:hover {
    transform: translateY(-2px);
    border-color: #00ffff;
    box-shadow: 0 5px 20px rgba(0, 255, 255, 0.4);
}

.option-box:hover::before {
    opacity: 0.7;
}

.option-box.selected {
    border-color: #00ff00;
    background: linear-gradient(145deg, rgba(0, 255, 0, 0.1), rgba(0, 50, 0, 0.8));
    box-shadow: 0 0 30px rgba(0, 255, 0, 0.5);
}

.option-box.selected::before {
    background: #00ff00;
    opacity: 0.3;
}

.operation-symbol {
    display: block;
    font-size: 2.5rem;
    font-weight: bold;
    color: #ff00ff;
    margin-bottom: 0.5rem;
    text-shadow: 0 0 15px currentColor;
}

.operation-name {
    font-size: 1rem;
    color: #00ffff;
    letter-spacing: 0.1em;
}

.range-numbers {
    font-size: 2rem;
    font-weight: bold;
    color: #00ffff;
    text-shadow: 0 0 15px currentColor;
}

.type-name {
    display: block;
    font-size: 1.1rem;
    color: #00ffff;
    margin-bottom: 0.5rem;
    letter-spacing: 0.05em;
}

.type-example {
    font-size: 0.9rem;
    color: #888;
    font-style: italic;
}

/* Preview section */
.preview-section {
    margin-top: 2rem;
}

.preview-card {
    background: linear-gradient(145deg, rgba(0, 0, 0, 0.9), rgba(30, 0, 30, 0.9));
    border: 2px solid rgba(255, 0, 255, 0.6);
    border-radius: 12px;
    padding: 2rem;
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
    max-width: 400px;
    margin: 0 auto;
}

.preview-card:hover {
    transform: scale(1.02);
    box-shadow: 0 10px 40px rgba(255, 0, 255, 0.4);
}

.preview-header {
    text-align: center;
    font-size: 1.2rem;
    color: #ff00ff;
    margin-bottom: 1.5rem;
    letter-spacing: 0.2em;
    text-shadow: 0 0 10px currentColor;
}

.preview-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.preview-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.preview-label {
    color: #888;
    font-size: 0.9rem;
}

.preview-value {
    color: #00ffff;
    font-weight: bold;
}

.launch-button {
    background: linear-gradient(45deg, #ff00ff, #ff0080);
    border: none;
    border-radius: 8px;
    padding: 1rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.launch-button:not(.ready) {
    background: #333;
    cursor: not-allowed;
    opacity: 0.5;
}

.launch-button.ready:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 0, 255, 0.6);
}

.launch-text {
    color: white;
    font-weight: bold;
    font-size: 1.1rem;
    letter-spacing: 0.1em;
}

.launch-indicator {
    position: absolute;
    top: 50%;
    right: 1rem;
    width: 10px;
    height: 10px;
    background: #00ff00;
    border-radius: 50%;
    transform: translateY(-50%);
    box-shadow: 0 0 10px #00ff00;
}

.launch-button:not(.ready) .launch-indicator {
    background: #666;
    box-shadow: none;
}

/* GAME MODE STYLES */
.game-mode {
    background: radial-gradient(ellipse at center, #1a0a2e 0%, #16213e 50%, #0f3460 100%);
    min-height: 100vh;
}

.game-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    position: relative;
    z-index: 10;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Game Stats Header */
.game-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.8);
    border: 2px solid rgba(0, 255, 255, 0.6);
    border-radius: 12px;
    padding: 1rem 2rem;
    margin-bottom: 2rem;
    position: relative;
    transition: all 0.3s ease;
}

.game-stats.hidden {
    opacity: 0.3;
    transform: translateY(-20px);
    pointer-events: none;
}

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

.stat-label {
    display: block;
    font-size: 0.8rem;
    color: #888;
    letter-spacing: 0.1em;
    margin-bottom: 0.3rem;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: bold;
    color: #00ffff;
    text-shadow: 0 0 10px currentColor;
}

.toggle-stats {
    background: transparent;
    border: 2px solid rgba(255, 0, 255, 0.6);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    color: #ff00ff;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-stats:hover {
    background: rgba(255, 0, 255, 0.2);
    box-shadow: 0 0 20px rgba(255, 0, 255, 0.4);
}

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

/* Main Equation Display */
.equation-display {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    margin: 2rem 0;
}

.equation-container {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin-bottom: 3rem;
    padding: 2rem;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid rgba(0, 255, 255, 0.4);
    border-radius: 16px;
    box-shadow: 0 0 30px rgba(0, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.equation-container.success-pulse {
    animation: successPulse 0.6s ease-in-out;
    border-color: #00ff00;
    box-shadow: 0 0 50px rgba(0, 255, 0, 0.6);
}

.equation-container.error-shake {
    animation: errorShake 0.6s ease-in-out;
    border-color: #ff0040;
    box-shadow: 0 0 50px rgba(255, 0, 64, 0.6);
}

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

@keyframes errorShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.operand-box, .operator-box, .equals-box, .result-box {
    background: linear-gradient(145deg, rgba(0, 0, 0, 0.8), rgba(20, 20, 40, 0.8));
    border: 2px solid rgba(0, 255, 255, 0.6);
    border-radius: 12px;
    padding: 1.5rem 2rem;
    min-width: 80px;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: all 0.3s ease;
}

.operand-box.missing, .result-box.missing {
    border-color: #ff00ff;
    background: linear-gradient(145deg, rgba(255, 0, 255, 0.1), rgba(100, 0, 100, 0.8));
    box-shadow: 0 0 30px rgba(255, 0, 255, 0.4);
    animation: missingGlow 2s ease-in-out infinite alternate;
}

@keyframes missingGlow {
    0% { box-shadow: 0 0 30px rgba(255, 0, 255, 0.4); }
    100% { box-shadow: 0 0 50px rgba(255, 0, 255, 0.8); }
}

.operand-value, .result-value {
    font-size: 2.5rem;
    font-weight: bold;
    color: #00ffff;
    text-shadow: 0 0 15px currentColor;
}

.operator-symbol, .equals-symbol {
    font-size: 3rem;
    font-weight: bold;
    color: #ff00ff;
    text-shadow: 0 0 20px currentColor;
}

.operator-box, .equals-box {
    background: transparent;
    border: none;
    min-width: 60px;
}

/* Answer Section */
.answer-section {
    display: flex;
    gap: 1rem;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
}

.answer-input {
    background: rgba(0, 0, 0, 0.8);
    border: 2px solid rgba(0, 255, 255, 0.6);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    font-size: 1.5rem;
    color: #00ffff;
    font-family: 'Courier New', monospace;
    text-align: center;
    min-width: 150px;
    transition: all 0.3s ease;
}

/* Hide number input spinner arrows */
.answer-input::-webkit-outer-spin-button,
.answer-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* Firefox */
.answer-input[type=number] {
    -moz-appearance: textfield;
}

.answer-input:focus {
    outline: none;
    border-color: #00ff00;
    box-shadow: 0 0 20px rgba(0, 255, 0, 0.4);
    background: rgba(0, 50, 0, 0.8);
}

.answer-input::placeholder {
    color: #666;
}

.answer-button {
    background: linear-gradient(45deg, #00ffff, #0080ff);
    border: none;
    border-radius: 8px;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: bold;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    opacity: 0.5;
    pointer-events: none;
    font-family: 'Courier New', monospace;
    letter-spacing: 0.1em;
}

.answer-button.active {
    opacity: 1;
    pointer-events: auto;
}

.answer-button.active:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 255, 255, 0.4);
}

/* Enhanced Cyberpunk Footer */
.cyber-footer {
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.9) 0%, rgba(20, 0, 40, 0.9) 50%, rgba(0, 20, 40, 0.9) 100%);
    border-top: 2px solid rgba(0, 255, 255, 0.6);
    margin-top: 3rem;
    padding: 2rem 0;
    position: relative;
    overflow: hidden;
}

.cyber-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, #00ffff, #ff00ff, #00ff00, transparent);
    animation: footerScan 3s linear infinite;
}

@keyframes footerScan {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    position: relative;
    z-index: 5;
}

.footer-section {
    background: rgba(0, 255, 255, 0.03);
    border: 1px solid rgba(0, 255, 255, 0.2);
    border-radius: 8px;
    padding: 1.5rem;
    transition: all 0.3s ease;
}

.footer-section:hover {
    border-color: rgba(0, 255, 255, 0.4);
    box-shadow: inset 0 0 20px rgba(0, 255, 255, 0.1);
}

.footer-title {
    color: #00ffff;
    font-size: 1rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: 0.1em;
    text-shadow: 0 0 10px currentColor;
}

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

.disclaimer-text {
    color: #ccc;
    font-size: 0.9rem;
    line-height: 1.6;
    text-align: justify;
}

.warning-label {
    color: #ff0080;
    font-weight: bold;
    text-shadow: 0 0 5px currentColor;
}

.ai-highlight {
    color: #00ff00;
    font-weight: bold;
    text-shadow: 0 0 8px currentColor;
}

.verify-notice {
    color: #ffff00;
    font-weight: bold;
    text-shadow: 0 0 8px currentColor;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.cyber-link {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    color: #00ffff;
    text-decoration: none;
    padding: 0.8rem 1rem;
    border: 1px solid rgba(0, 255, 255, 0.3);
    border-radius: 6px;
    background: rgba(0, 255, 255, 0.05);
    transition: all 0.3s ease;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
}

.cyber-link:hover {
    border-color: #00ffff;
    background: rgba(0, 255, 255, 0.1);
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.3);
    transform: translateX(5px);
}

.link-icon {
    font-size: 1.1rem;
}

.link-text {
    font-weight: bold;
    font-family: 'Courier New', monospace;
}

.support-note {
    color: #888;
    font-size: 0.8rem;
    text-align: center;
    margin-top: 1rem;
    font-style: italic;
}

.copyright-text {
    color: #999;
    font-size: 0.9rem;
    text-align: center;
    line-height: 1.5;
}

.copyright-main {
    color: #00ffff;
    font-weight: bold;
    text-shadow: 0 0 8px currentColor;
}

.license-info {
    color: #ff00ff;
    font-weight: bold;
    text-shadow: 0 0 8px currentColor;
}

.usage-rights {
    color: #00ff00;
    font-size: 0.85rem;
}

/* Footer responsive design */
@media (min-width: 768px) {
    .footer-content {
        grid-template-columns: 2fr 1fr 1fr;
    }
    
    .footer-links {
        flex-direction: row;
        gap: 0.5rem;
    }
    
    .cyber-link {
        flex-direction: column;
        text-align: center;
        padding: 1rem 0.8rem;
    }
}

@media (max-width: 480px) {
    .cyber-footer {
        padding: 1.5rem 0;
        margin-top: 2rem;
    }
    
    .footer-content {
        padding: 0 1rem;
        gap: 1.5rem;
    }
    
    .footer-section {
        padding: 1rem;
    }
    
    .disclaimer-text {
        font-size: 0.85rem;
    }
    
    .cyber-link {
        font-size: 0.85rem;
        padding: 0.6rem 0.8rem;
    }
}

/* Feedback Container */
.feedback-container {
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
}

.feedback-container.visible {
    opacity: 1;
    transform: translateY(0);
}

.feedback-message {
    font-size: 1.3rem;
    font-weight: bold;
    text-align: center;
    padding: 1rem 2rem;
    border-radius: 8px;
    text-shadow: 0 0 10px currentColor;
    letter-spacing: 0.1em;
}

.feedback-container.success .feedback-message {
    color: #00ff00;
    background: rgba(0, 255, 0, 0.1);
    border: 2px solid rgba(0, 255, 0, 0.4);
}

.feedback-container.error .feedback-message {
    color: #ff0040;
    background: rgba(255, 0, 64, 0.1);
    border: 2px solid rgba(255, 0, 64, 0.4);
}

/* Control Panel */
.control-panel {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 2rem;
    padding: 1rem;
}

.control-button {
    background: linear-gradient(45deg, #666, #888);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    padding: 0.8rem 1.5rem;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Courier New', monospace;
    font-weight: bold;
    letter-spacing: 0.1em;
}

.return-button:hover {
    background: linear-gradient(45deg, #ff4444, #ff6666);
    border-color: #ff4444;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 68, 68, 0.4);
}

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

.mission-info {
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(0, 255, 255, 0.4);
    border-radius: 8px;
    padding: 0.8rem 1.5rem;
    max-width: 400px;
}

.mission-text {
    color: #00ffff;
    font-size: 0.9rem;
    text-align: center;
}

/* MOBILE OPTIMIZATIONS */
@media (max-width: 768px) {
    /* General mobile adjustments */
    .title {
        font-size: 2.5rem;
    }
    
    /* Game Mode Mobile Optimizations */
    .game-mode .game-container {
        padding: 0.5rem;
        gap: 0;
        min-height: 100vh;
        justify-content: space-between;
    }
    
    /* Compact game stats */
    .game-stats {
        padding: 0.8rem 1rem;
        margin-bottom: 1rem;
        border-radius: 8px;
    }
    
    .stat-item {
        margin: 0 0.5rem;
    }
    
    .stat-label {
        font-size: 0.7rem;
        margin-bottom: 0.2rem;
    }
    
    .stat-value {
        font-size: 1.2rem;
    }
    
    .toggle-stats {
        width: 35px;
        height: 35px;
    }
    
    /* Compact equation display */
    .equation-display {
        margin: 1rem 0;
        flex: 1;
        justify-content: center;
    }
    
    .equation-container {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 0.8rem;
        padding: 1rem;
        margin-bottom: 1.5rem;
        border-radius: 12px;
        max-width: 100%;
        justify-content: center;
    }
    
    /* Smaller equation elements */
    .operand-box, .result-box {
        min-width: 50px;
        min-height: 50px;
        padding: 0.8rem;
        border-radius: 8px;
    }
    
    .operator-box, .equals-box {
        min-width: 30px;
        min-height: 50px;
        padding: 0.5rem;
    }
    
    .operand-value, .result-value {
        font-size: 1.8rem;
    }
    
    .operator-symbol, .equals-symbol {
        font-size: 2rem;
    }
    
    /* Compact answer section */
    .answer-section {
        gap: 0.8rem;
        margin-bottom: 1rem;
        align-items: stretch;
    }
    
    .answer-input {
        padding: 0.8rem 1rem;
        font-size: 1.3rem;
        min-width: 120px;
        flex: 1;
        max-width: 150px;
    }
    
    .answer-button {
        padding: 0.8rem 1.2rem;
        font-size: 1rem;
        flex-shrink: 0;
    }
    
    /* Compact feedback */
    .feedback-container {
        min-height: 40px;
        margin-bottom: 0.5rem;
    }
    
    .feedback-message {
        font-size: 1.1rem;
        padding: 0.6rem 1rem;
        border-radius: 6px;
    }
    
    /* Compact control panel */
    .control-panel {
        flex-direction: row;
        justify-content: space-between;
        margin-top: 1rem;
        padding: 0.5rem;
        gap: 0.5rem;
    }
    
    .control-button {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
        flex-shrink: 0;
    }
    
    .mission-info {
        padding: 0.6rem 1rem;
        max-width: none;
        flex: 1;
        margin-left: 0.5rem;
    }
    
    .mission-text {
        font-size: 0.8rem;
        line-height: 1.2;
    }
    
    /* Optimize vertical spacing for single-screen view */
    .equation-display {
        min-height: 0;
        padding: 0;
    }
}

/* Extra small mobile devices */
@media (max-width: 480px) {
    .container, .game-container {
        padding: 0.5rem;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .option-grid {
        grid-template-columns: 1fr;
    }
    
    /* Ultra-compact game mode for small screens */
    .game-mode .game-container {
        padding: 0.3rem;
        min-height: 100vh;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
    }
    
    /* Very compact stats */
    .game-stats {
        padding: 0.6rem 0.8rem;
        margin-bottom: 0.8rem;
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    .stat-item {
        margin: 0 0.3rem;
        min-width: 60px;
    }
    
    .stat-label {
        font-size: 0.65rem;
    }
    
    .stat-value {
        font-size: 1rem;
    }
    
    .toggle-stats {
        width: 30px;
        height: 30px;
        order: 1;
        margin-left: auto;
    }
    
    .toggle-icon {
        font-size: 1rem;
    }
    
    /* Ultra-compact equation */
    .equation-container {
        gap: 0.5rem;
        padding: 0.8rem;
        margin-bottom: 1rem;
        flex-wrap: wrap;
        justify-content: center;
        align-items: center;
    }
    
    .operand-box, .result-box {
        min-width: 45px;
        min-height: 45px;
        padding: 0.6rem;
    }
    
    .operator-box, .equals-box {
        min-width: 25px;
        min-height: 45px;
        padding: 0.4rem;
    }
    
    .operand-value, .result-value {
        font-size: 1.5rem;
    }
    
    .operator-symbol, .equals-symbol {
        font-size: 1.8rem;
    }
    
    /* Ultra-compact answer section */
    .answer-section {
        flex-direction: row;
        gap: 0.6rem;
        margin-bottom: 0.8rem;
        padding: 0 0.5rem;
    }
    
    .answer-input {
        padding: 0.7rem 0.8rem;
        font-size: 1.2rem;
        min-width: 100px;
        flex: 1;
        max-width: 130px;
    }
    
    .answer-button {
        padding: 0.7rem 1rem;
        font-size: 0.9rem;
    }
    
    /* Ultra-compact feedback */
    .feedback-container {
        min-height: 35px;
        margin-bottom: 0.3rem;
    }
    
    .feedback-message {
        font-size: 1rem;
        padding: 0.5rem 0.8rem;
    }
    
    /* Ultra-compact control panel */
    .control-panel {
        margin-top: 0.8rem;
        padding: 0.3rem;
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .control-button {
        padding: 0.6rem 0.8rem;
        font-size: 0.85rem;
        width: 100%;
        justify-content: center;
    }
    
    .mission-info {
        padding: 0.5rem 0.8rem;
        margin: 0;
        width: 100%;
    }
    
    .mission-text {
        font-size: 0.75rem;
    }
    
    /* Ensure everything fits in viewport */
    .equation-display {
        flex: 1;
        display: flex;
        flex-direction: column;
        justify-content: center;
        min-height: 0;
    }
}

/* Landscape orientation on small devices */
@media (max-width: 768px) and (orientation: landscape) {
    .game-mode .game-container {
        padding: 0.3rem;
    }
    
    .game-stats {
        margin-bottom: 0.5rem;
        padding: 0.5rem 1rem;
    }
    
    .equation-container {
        margin-bottom: 0.8rem;
        padding: 0.8rem;
        gap: 0.6rem;
    }
    
    .operand-box, .result-box {
        min-height: 40px;
        padding: 0.5rem 0.8rem;
    }
    
    .operator-box, .equals-box {
        min-height: 40px;
    }
    
    .operand-value, .result-value {
        font-size: 1.4rem;
    }
    
    .operator-symbol, .equals-symbol {
        font-size: 1.6rem;
    }
    
    .answer-section {
        margin-bottom: 0.6rem;
    }
    
    .control-panel {
        margin-top: 0.5rem;
        padding: 0.3rem;
    }
    
    .feedback-container {
        min-height: 30px;
    }
    
    .feedback-message {
        font-size: 0.95rem;
        padding: 0.4rem 0.8rem;
    }
}

/* Portrait tablets */
@media (min-width: 481px) and (max-width: 768px) {
    .equation-container {
        flex-direction: row;
        gap: 1.2rem;
        padding: 1.2rem;
    }
    
    .operand-box, .result-box {
        min-width: 60px;
        min-height: 60px;
        padding: 1rem;
    }
    
    .operand-value, .result-value {
        font-size: 2rem;
    }
    
    .operator-symbol, .equals-symbol {
        font-size: 2.2rem;
    }
}

/* Ensure touch targets are adequate */
@media (pointer: coarse) {
    .answer-button, .control-button, .toggle-stats {
        min-height: 44px;
        min-width: 44px;
    }
    
    .answer-input {
        min-height: 44px;
    }
    
    .option-box {
        min-height: 60px;
    }
    
    .launch-button {
        min-height: 50px;
    }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .operand-value, .result-value, .operator-symbol, .equals-symbol {
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
}