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

body {
    overflow: hidden;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #000;
}

#game-container {
    position: relative;
    width: 100vw;
    height: 100vh;
}

#game-canvas {
    display: block;
    width: 100%;
    height: 100%;
    touch-action: none; /* Prevent default touch behaviors (scrolling, zooming) for swipe gestures */
}

/* UI Overlay */
#ui-overlay {
    position: absolute;
    top: 20px;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    padding: 0 30px;
    pointer-events: none;
}

#yarn-counter,
#distance-counter {
    background: rgba(0, 0, 0, 0.6);
    color: #fff;
    padding: 12px 24px;
    border-radius: 25px;
    font-size: 1.4rem;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

#yarn-counter {
    background: linear-gradient(135deg, rgba(255, 105, 180, 0.8), rgba(147, 112, 219, 0.8));
}

#yarn-count,
#distance-count {
    color: #FFD700;
}

/* Message Display */
#message-display {
    position: absolute;
    top: 20px;
    right: 30px;
    background: rgba(0, 0, 0, 0.7);
    color: #fff;
    padding: 12px 24px;
    border-radius: 15px;
    font-size: 1.2rem;
    font-weight: bold;
    text-align: center;
    animation: pulse 0.5s ease-in-out infinite alternate;
    pointer-events: none;
}

@keyframes pulse {
    from { transform: scale(1); }
    to { transform: scale(1.05); }
}

/* End Screen */
#end-screen {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: #fff;
}

#end-screen h1 {
    font-size: 3rem;
    margin-bottom: 30px;
    color: #FFD700;
    text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.5);
}

#score-breakdown {
    font-size: 1.4rem;
    margin-bottom: 30px;
    text-align: center;
    line-height: 2;
}

#score-breakdown .score-line {
    margin: 10px 0;
}

#score-breakdown .total {
    font-size: 2rem;
    color: #FFD700;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 2px solid rgba(255, 255, 255, 0.3);
}

#restart-btn {
    background: linear-gradient(135deg, #FF69B4, #9370DB);
    color: #fff;
    border: none;
    padding: 15px 50px;
    font-size: 1.5rem;
    font-weight: bold;
    border-radius: 30px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    touch-action: manipulation; /* Prevent double-tap zoom on iOS */
    -webkit-tap-highlight-color: transparent; /* Remove tap highlight on iOS */
}

#restart-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 5px 20px rgba(255, 105, 180, 0.5);
}

.hint {
    margin-top: 15px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 1rem;
}

/* Utility */
.hidden {
    display: none !important;
}

/* Title Screen */
#title-screen {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        rgba(45, 20, 60, 0.95) 0%,
        rgba(80, 40, 100, 0.92) 30%,
        rgba(60, 30, 80, 0.95) 70%,
        rgba(30, 15, 45, 0.97) 100%
    );
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 100;
    transition: opacity 0.5s ease-out, visibility 0.5s ease-out;
}

#title-screen.fade-out {
    opacity: 0;
    visibility: hidden;
}

.game-title {
    font-family: Arial, Helvetica, sans-serif;
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    color: #fff;
    text-align: center;
    margin-bottom: 40px;
    text-shadow: 
        0 0 20px rgba(255, 105, 180, 0.8),
        0 0 40px rgba(255, 105, 180, 0.5),
        0 4px 8px rgba(0, 0, 0, 0.5);
    background: linear-gradient(135deg, #FFB6C1, #FF69B4, #DA70D6, #9370DB);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: titleFloat 3s ease-in-out infinite;
}

@keyframes titleFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.controls-panel {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 20px;
    padding: 30px 40px;
    margin-bottom: 40px;
    text-align: center;
    max-width: 90vw;
}

.controls-panel h2 {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: #FFD700;
    margin-bottom: 20px;
    letter-spacing: 1px;
}

.control-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin: 15px 0;
    flex-wrap: wrap;
}

.key-group {
    display: flex;
    gap: 6px;
}

.key {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    height: 44px;
    padding: 0 12px;
    background: linear-gradient(180deg, #4a4a5a 0%, #2a2a35 100%);
    border: 2px solid #5a5a6a;
    border-radius: 8px;
    color: #fff;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    box-shadow: 
        0 4px 0 #1a1a22,
        0 6px 10px rgba(0, 0, 0, 0.3);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.key.wide {
    min-width: 80px;
}

.control-desc {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1rem;
}

.goal-text {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
    margin-top: 20px;
    font-style: italic;
}

#start-btn {
    font-family: Arial, Helvetica, sans-serif;
    background: linear-gradient(135deg, #FF69B4, #DA70D6, #9370DB);
    color: #fff;
    border: none;
    padding: 18px 60px;
    font-size: 1.6rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 
        0 6px 20px rgba(255, 105, 180, 0.4),
        0 0 40px rgba(147, 112, 219, 0.3);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: 1px;
    animation: btnPulse 2s ease-in-out infinite;
    touch-action: manipulation; /* Prevent double-tap zoom on iOS */
    -webkit-tap-highlight-color: transparent; /* Remove tap highlight on iOS */
}

@keyframes btnPulse {
    0%, 100% { 
        box-shadow: 
            0 6px 20px rgba(255, 105, 180, 0.4),
            0 0 40px rgba(147, 112, 219, 0.3);
    }
    50% { 
        box-shadow: 
            0 8px 30px rgba(255, 105, 180, 0.6),
            0 0 60px rgba(147, 112, 219, 0.5);
    }
}

#start-btn:hover {
    transform: scale(1.08) translateY(-2px);
    box-shadow: 
        0 10px 30px rgba(255, 105, 180, 0.6),
        0 0 60px rgba(147, 112, 219, 0.5);
}

#start-btn:active {
    transform: scale(1.02);
}

/* Level Screen */
#level-screen {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        rgba(45, 20, 60, 0.92) 0%,
        rgba(80, 40, 100, 0.88) 30%,
        rgba(60, 30, 80, 0.92) 70%,
        rgba(30, 15, 45, 0.95) 100%
    );
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 90;
    transition: opacity 0.5s ease-out, visibility 0.5s ease-out;
}

#level-screen.fade-out {
    opacity: 0;
    visibility: hidden;
}

.level-announce {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.level-label {
    font-family: Arial, Helvetica, sans-serif;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 600;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 8px;
}

.level-number {
    font-family: Arial, Helvetica, sans-serif;
    font-size: clamp(6rem, 20vw, 12rem);
    font-weight: 700;
    background: linear-gradient(135deg, #FFD700, #FFA500, #FF69B4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: none;
    filter: drop-shadow(0 0 30px rgba(255, 215, 0, 0.6));
    animation: levelPop 0.5s ease-out;
}

@keyframes levelPop {
    0% { transform: scale(0.5); opacity: 0; }
    70% { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}

.end-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 10px;
}

.quit-btn {
    font-family: Arial, Helvetica, sans-serif;
    background: transparent;
    color: rgba(255, 255, 255, 0.7);
    border: 2px solid rgba(255, 255, 255, 0.3);
    padding: 14px 30px;
    font-size: 1.1rem;
    font-weight: 500;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.2s;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.quit-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    color: rgba(255, 255, 255, 0.9);
}

/* Fail Screen */
#fail-screen {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        rgba(60, 20, 30, 0.95) 0%,
        rgba(100, 30, 50, 0.92) 30%,
        rgba(80, 25, 40, 0.95) 70%,
        rgba(45, 15, 25, 0.97) 100%
    );
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 95;
}

.fail-title {
    font-family: Arial, Helvetica, sans-serif;
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 700;
    background: linear-gradient(135deg, #FF6B6B, #EE5A5A, #DC143C);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    text-shadow: none;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.5));
}

.fail-level {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 20px;
}

.fail-stats {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.8);
    text-align: center;
    margin-bottom: 30px;
    line-height: 1.8;
}

#retry-btn {
    font-family: Arial, Helvetica, sans-serif;
    background: linear-gradient(135deg, #FF6B6B, #EE5A5A, #DC143C);
    color: #fff;
    border: none;
    padding: 18px 60px;
    font-size: 1.6rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 
        0 6px 20px rgba(255, 107, 107, 0.4),
        0 0 40px rgba(220, 20, 60, 0.3);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: 1px;
    touch-action: manipulation; /* Prevent double-tap zoom on iOS */
    -webkit-tap-highlight-color: transparent; /* Remove tap highlight on iOS */
}

#retry-btn:hover {
    transform: scale(1.08) translateY(-2px);
    box-shadow: 
        0 10px 30px rgba(255, 107, 107, 0.6),
        0 0 60px rgba(220, 20, 60, 0.5);
}

/* Success Screen */
#success-screen {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 95;
    pointer-events: auto;
}

.success-title {
    font-family: Arial, Helvetica, sans-serif;
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 700;
    background: linear-gradient(135deg, #90EE90, #32CD32, #228B22);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    text-shadow: none;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.5));
    animation: successPulse 1s ease-in-out infinite;
}

@keyframes successPulse {
    0%, 100% { filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.5)) drop-shadow(0 0 20px rgba(50, 205, 50, 0.4)); }
    50% { filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.5)) drop-shadow(0 0 40px rgba(50, 205, 50, 0.7)); }
}

.success-level {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 30px;
}

#next-level-btn {
    font-family: Arial, Helvetica, sans-serif;
    background: linear-gradient(135deg, #90EE90, #32CD32, #228B22);
    color: #fff;
    border: none;
    padding: 18px 60px;
    font-size: 1.6rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 
        0 6px 20px rgba(50, 205, 50, 0.4),
        0 0 40px rgba(34, 139, 34, 0.3);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: 1px;
    touch-action: manipulation; /* Prevent double-tap zoom on iOS */
    -webkit-tap-highlight-color: transparent; /* Remove tap highlight on iOS */
}

#next-level-btn:hover {
    transform: scale(1.08) translateY(-2px);
    box-shadow: 
        0 10px 30px rgba(50, 205, 50, 0.6),
        0 0 60px rgba(34, 139, 34, 0.5);
}

/* Title Screen Buttons */
.title-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

#settings-btn {
    font-family: Arial, Helvetica, sans-serif;
    background: linear-gradient(135deg, #4a4a6a, #3a3a5a, #2a2a4a);
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.2);
    padding: 18px 40px;
    font-size: 1.4rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
    box-shadow: 
        0 6px 20px rgba(0, 0, 0, 0.3),
        0 0 20px rgba(147, 112, 219, 0.2);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: 1px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

#settings-btn:hover {
    transform: scale(1.05) translateY(-2px);
    border-color: rgba(255, 255, 255, 0.4);
    box-shadow: 
        0 10px 30px rgba(0, 0, 0, 0.4),
        0 0 40px rgba(147, 112, 219, 0.4);
}

/* Settings Modal */
#settings-modal {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        rgba(30, 15, 45, 0.98) 0%,
        rgba(50, 25, 70, 0.96) 30%,
        rgba(40, 20, 55, 0.98) 70%,
        rgba(20, 10, 30, 0.99) 100%
    );
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 110;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.settings-content {
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 24px;
    padding: 40px 50px;
    max-width: 500px;
    width: 90vw;
    max-height: 90vh;
    overflow-y: auto;
    touch-action: pan-y; /* Allow vertical scroll but let sliders handle horizontal */
    -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
}

.settings-title {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 30px;
    background: linear-gradient(135deg, #FFD700, #FFA500, #FF69B4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.setting-row {
    margin-bottom: 28px;
}

.setting-row label {
    display: block;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 10px;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 12px;
    touch-action: pan-x; /* Allow horizontal touch for slider */
}

.slider-min,
.slider-max {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
    min-width: 35px;
    text-align: center;
}

.slider-value {
    display: block;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 1.2rem;
    font-weight: 700;
    color: #FFD700;
    text-align: center;
    margin-top: 8px;
}

/* Custom Slider Styling */
.setting-row input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 8px;
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0.25));
    border-radius: 4px;
    outline: none;
    cursor: pointer;
    touch-action: pan-x; /* Allow horizontal touch sliding */
    -webkit-tap-highlight-color: transparent;
}

.setting-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, #FF69B4, #DA70D6, #9370DB);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 
        0 2px 8px rgba(255, 105, 180, 0.5),
        0 0 15px rgba(147, 112, 219, 0.4);
    transition: transform 0.15s, box-shadow 0.15s;
}

.setting-row input[type="range"]::-webkit-slider-thumb:hover,
.setting-row input[type="range"]::-webkit-slider-thumb:active {
    transform: scale(1.15);
    box-shadow: 
        0 3px 12px rgba(255, 105, 180, 0.7),
        0 0 25px rgba(147, 112, 219, 0.6);
}

.setting-row input[type="range"]:active::-webkit-slider-thumb {
    transform: scale(1.2);
}

.setting-row input[type="range"]::-moz-range-thumb {
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, #FF69B4, #DA70D6, #9370DB);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 
        0 2px 8px rgba(255, 105, 180, 0.5),
        0 0 15px rgba(147, 112, 219, 0.4);
    transition: transform 0.15s, box-shadow 0.15s;
}

.setting-row input[type="range"]:active::-moz-range-thumb {
    transform: scale(1.2);
    box-shadow: 
        0 3px 12px rgba(255, 105, 180, 0.7),
        0 0 25px rgba(147, 112, 219, 0.6);
}

.setting-row input[type="range"]::-moz-range-track {
    height: 8px;
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0.25));
    border-radius: 4px;
}

#settings-close-btn {
    display: block;
    width: 100%;
    margin-top: 20px;
    font-family: Arial, Helvetica, sans-serif;
    background: linear-gradient(135deg, #FF69B4, #DA70D6, #9370DB);
    color: #fff;
    border: none;
    padding: 16px 40px;
    font-size: 1.4rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 
        0 6px 20px rgba(255, 105, 180, 0.4),
        0 0 30px rgba(147, 112, 219, 0.3);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: 1px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

#settings-close-btn:hover {
    transform: scale(1.05) translateY(-2px);
    box-shadow: 
        0 10px 30px rgba(255, 105, 180, 0.6),
        0 0 50px rgba(147, 112, 219, 0.5);
}