/* Global Reset & Base Variables */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-color: #0a0b10;
    --panel-bg: rgba(18, 20, 32, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    
    /* Neon glow colors */
    --neon-pink: #ff007f;
    --neon-cyan: #00f0ff;
    --neon-green: #39ff14;
    --neon-yellow: #fffb00;
    --neon-purple: #b026ff;
    --neon-orange: #ff6700;
    --neon-white: #ffffff;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: #e2e8f0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
}

/* Glassmorphism panel helper */
.glass-panel {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

/* Application Container */
#app-container {
    width: 95vw;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 20px;
}

/* Game Header */
#game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
}

#game-title {
    font-family: 'Orbitron', sans-serif;
    font-weight: 900;
    font-size: 2.5rem;
    color: #ffffff;
    text-shadow: 0 0 10px var(--neon-cyan), 0 0 20px var(--neon-cyan);
    letter-spacing: 4px;
}

#active-gravity {
    padding: 10px 20px;
    font-family: 'Orbitron', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 2px;
    border-color: rgba(0, 240, 255, 0.3);
    box-shadow: inset 0 0 10px rgba(0, 240, 255, 0.1);
}

#gravity-value {
    color: var(--neon-cyan);
    text-shadow: 0 0 8px var(--neon-cyan);
    transition: all 0.3s ease;
}

/* Main Layout Grid */
#main-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 20px;
    height: 75vh;
    min-height: 500px;
}

/* Canvas Container */
#canvas-container {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow: hidden;
    border-color: rgba(255, 255, 255, 0.05);
}

#game-canvas {
    display: block;
    max-width: 100%;
    max-height: 100%;
    transition: transform 0.1s ease;
}

/* Game Over Overlay */
#game-over-overlay, #pause-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 11, 16, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    opacity: 1;
    transition: opacity 0.3s ease;
}

#game-over-overlay.hidden, #pause-overlay.hidden {
    display: none;
    opacity: 0;
    pointer-events: none;
}

.pause-description {
    font-family: 'Inter', sans-serif;
    color: #a0a5c0;
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 25px;
    max-width: 320px;
    text-align: left;
}

.pause-description p {
    margin-bottom: 12px;
}

.pause-description strong {
    color: var(--neon-cyan);
    text-shadow: 0 0 5px rgba(0, 240, 255, 0.3);
}

.overlay-content {
    padding: 40px;
    text-align: center;
    border-color: rgba(255, 0, 127, 0.3);
    box-shadow: 0 0 20px rgba(255, 0, 127, 0.2);
}

.overlay-content h2 {
    font-family: 'Orbitron', sans-serif;
    font-size: 2.2rem;
    font-weight: 900;
    margin-bottom: 25px;
    color: var(--neon-pink);
    text-shadow: 0 0 10px var(--neon-pink);
    letter-spacing: 3px;
}

button {
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    letter-spacing: 1px;
    padding: 12px 30px;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
}

#restart-button {
    background: transparent;
    border: 2px solid var(--neon-pink);
    color: var(--neon-pink);
    box-shadow: 0 0 10px rgba(255, 0, 127, 0.1);
}

#restart-button:hover {
    background: var(--neon-pink);
    color: #ffffff;
    box-shadow: 0 0 15px var(--neon-pink);
}

/* Side controls Panel */
#controls-panel {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 25px;
    border-color: rgba(255, 255, 255, 0.05);
}

/* Next Piece Preview Styling */
#next-piece-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
    margin-bottom: 15px;
}

#next-piece-container h3 {
    border-bottom: none !important;
    padding-bottom: 0 !important;
    margin-bottom: 10px !important;
}

.next-canvas-wrapper {
    background: rgba(10, 11, 16, 0.5);
    border: 1.5px dashed rgba(0, 240, 255, 0.25);
    border-radius: 8px;
    padding: 6px;
    box-shadow: inset 0 0 12px rgba(0, 240, 255, 0.05);
}

#next-canvas {
    display: block;
    width: 100px;
    height: 100px;
}

#controls-panel h3 {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.3rem;
    letter-spacing: 2px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
    color: #ffffff;
}

.control-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.control-list li {
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 10px;
    color: #94a3b8;
}

.key {
    background: rgba(255, 255, 255, 0.15);
    color: #ffffff;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.85rem;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.25);
    min-width: 30px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.game-status-btn-container {
    margin-top: auto;
}

#start-button {
    width: 100%;
    background: transparent;
    border: 2px solid var(--neon-green);
    color: var(--neon-green);
    box-shadow: 0 0 10px rgba(57, 255, 20, 0.1);
}

#start-button:hover {
    background: var(--neon-green);
    color: #0a0b10;
    box-shadow: 0 0 15px var(--neon-green);
}

/* Virtual Keypad Styling */
#virtual-keypad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px 10px;
    margin: 20px 0;
}

.keypad-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.shortcut-label {
    font-family: 'Inter', sans-serif;
    font-size: 0.65rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.4);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-align: center;
    display: block;
    height: 14px;
    line-height: 14px;
}

.system-shortcuts {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px dashed rgba(255, 255, 255, 0.1);
}

.sys-shortcut {
    font-size: 0.85rem;
    color: #94a3b8;
    display: flex;
    align-items: center;
    gap: 10px;
}

.keypad-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: #ffffff;
    font-family: 'Orbitron', sans-serif;
    font-size: 1.2rem;
    font-weight: 700;
    padding: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}

.keypad-btn:hover {
    background: rgba(0, 240, 255, 0.15);
    border-color: var(--neon-cyan);
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.4);
}

.keypad-btn:active {
    transform: scale(0.95);
}

/* Specific styling for action buttons */
.keypad-btn[data-control="hardDrop"] {
    font-size: 0.8rem;
    letter-spacing: 1px;
}

.keypad-btn[data-control="hardDrop"]:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: #ffffff;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.4);
}

.keypad-btn[data-control="toggleGravity"]:hover {
    background: rgba(255, 0, 127, 0.15);
    border-color: var(--neon-pink);
    box-shadow: 0 0 10px rgba(255, 0, 127, 0.4);
}

/* Responsive Scaling for Mobile Screens */
@media (max-width: 768px) {
    #main-layout {
        grid-template-columns: 1fr;
        height: auto;
    }
    
    #app-container {
        padding: 10px;
        width: 100vw;
    }
    
    #canvas-container {
        height: 60vh;
        min-height: 350px;
    }
    
    #controls-panel {
        margin-top: 10px;
        gap: 20px;
    }
    
    .shortcut-label, .system-shortcuts {
        display: none !important;
    }
}