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

body {
    font-family: 'Orbitron', monospace;
    line-height: 1.6;
    color: #2c3e50;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
    color: white;
    position: relative;
}

header h1 {
    font-family: 'Press Start 2P', cursive;
    font-size: 3rem;
    margin-bottom: 15px;
    text-shadow: 
        3px 3px 0px rgba(0, 0, 0, 0.3),
        0 0 20px rgba(255, 255, 255, 0.5),
        0 0 40px rgba(255, 255, 255, 0.3),
        0 0 60px rgba(255, 255, 255, 0.2);
    animation: glow 2s ease-in-out infinite alternate;
    letter-spacing: 2px;
    position: relative;
}

header h1::before {
    content: '🏰';
    position: absolute;
    left: -60px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 2.5rem;
    animation: float 3s ease-in-out infinite;
}

header h1::after {
    content: '🏰';
    position: absolute;
    right: -60px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 2.5rem;
    animation: float 3s ease-in-out infinite reverse;
}

@keyframes glow {
    from {
        text-shadow: 
            3px 3px 0px rgba(0, 0, 0, 0.3),
            0 0 20px rgba(255, 255, 255, 0.5),
            0 0 40px rgba(255, 255, 255, 0.3),
            0 0 60px rgba(255, 255, 255, 0.2);
    }
    to {
        text-shadow: 
            3px 3px 0px rgba(0, 0, 0, 0.3),
            0 0 30px rgba(255, 255, 255, 0.8),
            0 0 50px rgba(255, 255, 255, 0.5),
            0 0 70px rgba(255, 255, 255, 0.3);
    }
}

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

header p {
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 600;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: 1px;
}

/* Hanoi text color animation */
.hanoi-text {
    background: linear-gradient(
        45deg,
        #ff6b6b,
        #4ecdc4,
        #45b7d1,
        #96ceb4,
        #ffeaa7,
        #a29bfe,
        #fd79a8,
        #ff6b6b
    );
    background-size: 300% 300%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: hanoiColorFlow 4s ease-in-out infinite;
    display: inline-block;
}

@keyframes hanoiColorFlow {
    0% {
        background-position: 0% 50%;
        filter: hue-rotate(0deg);
    }
    25% {
        background-position: 50% 0%;
        filter: hue-rotate(90deg);
    }
    50% {
        background-position: 100% 50%;
        filter: hue-rotate(180deg);
    }
    75% {
        background-position: 50% 100%;
        filter: hue-rotate(270deg);
    }
    100% {
        background-position: 0% 50%;
        filter: hue-rotate(360deg);
    }
}

/* Control Panel */
.control-panel {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 25px;
    margin-bottom: 30px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
}

.disk-control {
    display: flex;
    align-items: center;
    gap: 10px;
}

.disk-control label {
    font-weight: 700;
    color: #555;
    font-family: 'Orbitron', monospace;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.disk-control input {
    width: 60px;
    padding: 8px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    text-align: center;
    transition: border-color 0.3s ease;
}

.disk-control input:focus {
    outline: none;
    border-color: #667eea;
}

.btn {
    padding: 15px 30px;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
    font-family: 'Orbitron', monospace;
    box-shadow: 
        0 4px 15px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.btn.primary {
    background: linear-gradient(135deg, #00b894 0%, #00a085 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(0, 184, 148, 0.3);
}

.btn.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 184, 148, 0.4);
}

.btn.secondary {
    background: linear-gradient(135deg, #fd79a8 0%, #e84393 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(253, 121, 168, 0.3);
}

.btn.secondary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(253, 121, 168, 0.4);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.game-info {
    display: flex;
    justify-content: center;
    gap: 30px;
    font-size: 18px;
    font-weight: 700;
    font-family: 'Orbitron', monospace;
    letter-spacing: 1px;
}

.move-counter, .min-moves {
    display: flex;
    align-items: center;
    gap: 5px;
}

.move-counter span:first-child,
.min-moves span:first-child {
    color: #666;
}

.move-counter span:last-child,
.min-moves span:last-child {
    color: #0984e3;
    font-size: 24px;
    font-weight: 700;
}

/* Game Board */
.game-board {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.pegs-container {
    display: flex;
    justify-content: space-around;
    align-items: flex-end;
    min-height: 400px;
    gap: 20px;
}

.peg {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    min-height: 380px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 20px 10px;
    border-radius: 15px;
    background: rgba(116, 185, 255, 0.1);
    border: 2px solid transparent;
    justify-content: flex-end;
}

.peg:hover {
    transform: scale(1.02);
    background: rgba(116, 185, 255, 0.2);
    border-color: rgba(116, 185, 255, 0.3);
}

.peg.selected {
    transform: scale(1.05);
    background: rgba(253, 121, 168, 0.2);
    border-color: #fd79a8;
    box-shadow: 0 0 20px rgba(253, 121, 168, 0.3);
}

.peg.selected::before {
    content: '';
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 15px solid transparent;
    border-right: 15px solid transparent;
    border-top: 15px solid #fd79a8;
    animation: shake 1s infinite;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-8px); }
    20%, 40%, 60%, 80% { transform: translateX(8px); }
}

.peg-base {
    width: 100%;
    height: 15px;
    background: linear-gradient(135deg, #8b4513 0%, #654321 100%);
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
    position: absolute;
    bottom: 0;
    z-index: 1;
}

.peg-pole {
    width: 8px;
    height: 200px;
    background: linear-gradient(135deg, #8b4513 0%, #654321 100%);
    border-radius: 4px 4px 0 0;
    position: absolute;
    bottom: 15px;
    box-shadow: 0 0 10px rgba(0,0,0,0.2);
    z-index: 0;
}

.disks {
    position: absolute;
    bottom: 15px;
    display: flex;
    flex-direction: column-reverse;
    align-items: center;
    gap: 0;
    width: 100%;
    z-index: 2;
}

.disk {
    height: 35px;
    border-radius: 18px;
    position: relative;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: white;
    font-size: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.disk:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
}

.disk.dragging {
    cursor: grabbing;
    opacity: 0.9;
    transform: scale(1.1) translateY(-8px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
    z-index: 100;
}

/* Disk colors and sizes */
.disk[data-size="1"] { width: 45px; background: linear-gradient(135deg, #ff6b6b, #ee5a24); }
.disk[data-size="2"] { width: 65px; background: linear-gradient(135deg, #4ecdc4, #44a08d); }
.disk[data-size="3"] { width: 85px; background: linear-gradient(135deg, #45b7d1, #2196f3); }
.disk[data-size="4"] { width: 105px; background: linear-gradient(135deg, #96ceb4, #88d8b0); }
.disk[data-size="5"] { width: 125px; background: linear-gradient(135deg, #ffeaa7, #fdcb6e); }
.disk[data-size="6"] { width: 145px; background: linear-gradient(135deg, #dfe6e9, #b2bec3); }
.disk[data-size="7"] { width: 165px; background: linear-gradient(135deg, #a29bfe, #6c5ce7); }
.disk[data-size="8"] { width: 185px; background: linear-gradient(135deg, #fd79a8, #e84393); }

/* Instructions */
.instructions {
    background: white;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.instructions h2 {
    color: #667eea;
    margin-bottom: 15px;
    text-align: center;
    font-family: 'Press Start 2P', cursive;
    font-size: 1.2rem;
    letter-spacing: 1px;
}

.instructions ul {
    list-style: none;
    padding: 0;
}

.instructions li {
    padding: 8px 0;
    border-bottom: 1px solid #eee;
    text-align: center;
    font-family: 'Orbitron', monospace;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.instructions li:last-child {
    border-bottom: none;
}

.instructions li::before {
    content: "▶ ";
    color: #667eea;
    font-weight: bold;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: flex;
    justify-content: center;
    align-items: center;
}

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

.modal-content {
    background: white;
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { transform: translateY(-50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-content h2 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 2rem;
}

.modal-content p {
    margin-bottom: 15px;
    font-size: 1.1rem;
    color: #555;
}

.modal-content span {
    color: #667eea;
    font-weight: bold;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .instructions h2 {
        font-size: 1rem;
        letter-spacing: 0.8px;
    }

    /* Simplify animated Hanoi gradient on mobile to reduce GPU usage */
    .hanoi-text {
        animation: none;
        background: none;
        -webkit-text-fill-color: #ffeaa7;
        color: #ffeaa7;
    }
    
    header h1 {
        font-size: 2rem;
        letter-spacing: 1px;
        padding: 0 20px;
    }
    
    /* Completely remove animated elements on mobile */
    header h1::before,
    header h1::after {
        display: none;
    }
    
    /* Disable all animations on mobile for better performance */
    header h1 {
        animation: none;
        text-shadow: 3px 3px 0px rgba(0, 0, 0, 0.3);
    }
    
    .controls {
        flex-direction: column;
        gap: 15px;
    }
    
    .game-info {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .pegs-container {
        flex-direction: row;
        align-items: flex-end;
        gap: 15px;
        min-height: 350px;
        flex-wrap: nowrap;
        overflow-x: auto;
        padding: 10px;
    }
    
    .peg {
        flex: 1;
        min-width: 100px;
        max-width: 120px;
        min-height: 330px;
        padding: 15px 5px;
    }
    
    /* Disable shake animation on mobile for better performance */
    .peg.selected::before {
        animation: none;
    }
    
    .disk {
        height: 30px;
        font-size: 14px;
    }
    
    /* Adjust disk sizes for mobile side-by-side */
    .disk[data-size="1"] { width: 30px; }
    .disk[data-size="2"] { width: 40px; }
    .disk[data-size="3"] { width: 50px; }
    .disk[data-size="4"] { width: 60px; }
    .disk[data-size="5"] { width: 70px; }
    .disk[data-size="6"] { width: 80px; }
    .disk[data-size="7"] { width: 90px; }
    .disk[data-size="8"] { width: 100px; }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 1.8rem;
        padding: 0 20px;
    }
    
    /* Completely remove animated elements on mobile */
    header h1::before,
    header h1::after {
        display: none;
    }
    
    /* Disable all animations on mobile for better performance */
    header h1 {
        animation: none;
        text-shadow: 3px 3px 0px rgba(0, 0, 0, 0.3);
    }
    
    .control-panel {
        padding: 20px;
    }
    
    .game-board {
        padding: 25px;
    }
    
    .btn {
        padding: 12px 25px;
        font-size: 15px;
        letter-spacing: 0.8px;
    }
    
    .disk {
        height: 28px;
        font-size: 13px;
    }
    
    .pegs-container {
        flex-direction: row;
        align-items: flex-end;
        gap: 10px;
        min-height: 320px;
        flex-wrap: nowrap;
        overflow-x: auto;
        padding: 5px;
    }
    
    .peg {
        flex: 1;
        min-width: 80px;
        max-width: 100px;
        min-height: 300px;
        padding: 10px 3px;
    }
    
    /* Disable shake animation on mobile for better performance */
    .peg.selected::before {
        animation: none;
    }
    
    .disk {
        height: 28px;
        font-size: 13px;
    }
    
    /* Further adjust disk sizes for small screens side-by-side */
    .disk[data-size="1"] { width: 25px; }
    .disk[data-size="2"] { width: 32px; }
    .disk[data-size="3"] { width: 39px; }
    .disk[data-size="4"] { width: 46px; }
    .disk[data-size="5"] { width: 53px; }
    .disk[data-size="6"] { width: 60px; }
    .disk[data-size="7"] { width: 67px; }
    .disk[data-size="8"] { width: 74px; }
}