* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Outfit', sans-serif;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

:root {
    --theme-bg-1: #0f0c29;
    --theme-bg-2: #302b63;
    --theme-bg-3: #24243e;
    
    --theme-glow: #8a2be2;
    --theme-card-back: linear-gradient(135deg, rgba(255,255,255,0.1), rgba(255,255,255,0.05));
    --theme-border: rgba(255, 255, 255, 0.1);
    --theme-text: #ffffff;
    --theme-success: #00ff88;
    --theme-error: #ff3366;
    
    --glass-bg: rgba(15, 12, 41, 0.6);
    --glass-border: rgba(255, 255, 255, 0.15);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    
    --card-size-max: 120px;
    --card-size-min: 50px;
}

/* Base Body Styles */
body {
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background: linear-gradient(to bottom, var(--theme-bg-1), var(--theme-bg-2), var(--theme-bg-3));
    color: var(--theme-text);
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Background Canvas */
#bg-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

/* UI Layer */
#ui-layer {
    position: relative;
    z-index: 10;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* Glass Panels */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: var(--glass-shadow);
    padding: 30px;
    text-align: center;
    will-change: transform;
}

.screen-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    max-width: 500px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, -45%) scale(0.95);
}

.active {
    opacity: 1;
    pointer-events: all;
    transform: translate(-50%, -50%) scale(1);
}

/* Perspective Container */
#game-container {
    perspective: 1200px;
}


/* Typography & Effects */
.glow-text {
    font-size: 2.5rem;
    font-weight: 800;
    text-transform: uppercase;
    background: linear-gradient(to right, #fff, var(--theme-glow), #fff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 15px var(--theme-glow));
    margin-bottom: 10px;
    animation: titleGlow 3s ease-in-out infinite alternate;
}

@keyframes titleGlow {
    from { filter: drop-shadow(0 0 10px var(--theme-glow)); }
    to { filter: drop-shadow(0 0 25px var(--theme-glow)); }
}

.subtitle {
    font-size: 1.1rem;
    font-weight: 300;
    opacity: 0.8;
}

.instructions {
    background: rgba(0,0,0,0.3);
    padding: 15px;
    border-radius: 12px;
    text-align: left;
}

.instructions h3 {
    margin-bottom: 10px;
    color: var(--theme-glow);
}

.instructions ul {
    list-style-type: none;
}

.instructions li {
    margin-bottom: 8px;
    position: relative;
    padding-left: 20px;
    font-size: 0.95rem;
}

.instructions li::before {
    content: "✦";
    position: absolute;
    left: 0;
    color: var(--theme-text);
}

#game-thumbnail {
    width: 100%;
    max-height: 200px;
    object-fit: cover;
    border-radius: 12px;
    margin-bottom: 10px;
    border: 1px solid var(--theme-border);
    box-shadow: 0 0 20px rgba(138, 43, 226, 0.3);
}

/* Buttons */
.btn-primary {
    background: linear-gradient(135deg, var(--theme-glow), #4a148c);
    color: #fff;
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(138, 43, 226, 0.4);
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    outline: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(138, 43, 226, 0.6);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--theme-border);
    color: #fff;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
}

.btn-powerup {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--theme-border);
    color: #fff;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
}

.btn-powerup:hover {
    background: var(--theme-glow);
    box-shadow: 0 0 15px var(--theme-glow);
    transform: translateY(-2px);
}

.btn-powerup.active {
    background: var(--theme-success);
    box-shadow: 0 0 20px var(--theme-success);
}

.btn-powerup:disabled {
    opacity: 0.3;
    pointer-events: none;
}

.power-ups {
    flex-direction: row !important;
    gap: 10px;
}

/* HUD System */
#hud {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 95%;
    max-width: 800px;
    display: flex;
    justify-content: space-between;
    padding: 15px 25px;
    border-radius: 20px;
    transition: opacity 0.3s ease;
}

#hud.hidden {
    opacity: 0;
    transform: translateX(-50%) translateY(-20px);
}

.hud-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hud-item .label {
    font-size: 0.75rem;
    font-weight: 600;
    color: rgba(255,255,255,0.6);
    letter-spacing: 1px;
}

.hud-item .value {
    font-size: 1.4rem;
    font-weight: 800;
}

.combo-meter-container {
    width: 100px;
}

.combo-bar {
    width: 100%;
    height: 6px;
    background: rgba(0,0,0,0.5);
    border-radius: 3px;
    margin: 4px 0;
    overflow: hidden;
}

#combo-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #ff9a9e 0%, #fecfef 99%, #fecfef 100%);
    box-shadow: 0 0 10px #ff9a9e;
    transition: width 0.1s linear;
}

/* Game Board Layer */
#game-container {
    width: 100%;
    height: calc(100% - 100px);
    margin-top: 80px;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    transition: opacity 0.5s ease;
}

#game-container.hidden {
    opacity: 0;
    pointer-events: none;
}

#card-grid {
    display: grid;
    gap: 8px;
    max-width: 100%;
    max-height: 100%;
}

/* Cards */
.card {
    position: relative;
    width: var(--card-size-w);
    height: var(--card-size-h);
    border-radius: 16px;
    cursor: pointer;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1); /* Bounce/Overshoot effect */
    will-change: transform;
    transform: translateZ(0);
}

.card:active {
    transform: scale(0.95) translateZ(0);
}


.card:hover {
    filter: brightness(1.1);
}

.card.flipped {
    transform: rotateY(180deg);
}

.card.matched {
    transform: rotateY(180deg) scale(0.95);
    opacity: 0.8;
}

.card.wrong {
    animation: shake 0.5s;
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.card-back {
    background: var(--theme-card-back);
    border: 2px solid var(--theme-border);
    background-size: cover;
    background-position: center;
}

/* Pattern overlay for back */
.card-back::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 10px 10px;
}

.card-front {
    background: rgba(15, 15, 25, 0.95);
    border: 2px solid rgba(255, 255, 255, 0.4);
    transform: rotateY(180deg) translateZ(1px);
    box-shadow: inset 0 0 15px rgba(255, 255, 255, 0.05); /* Soft inner glow */
}
@keyframes shake {
    0%, 100% { transform: rotateY(180deg) translateX(0); }
    20% { transform: rotateY(180deg) translateX(-10px); text-shadow: 0 0 10px var(--theme-error); }
    40% { transform: rotateY(180deg) translateX(10px); }
    60% { transform: rotateY(180deg) translateX(-10px); }
    80% { transform: rotateY(180deg) translateX(10px); }
}

/* Results / Stars */
.stars {
    font-size: 2.5rem;
    margin: 15px 0;
    filter: drop-shadow(0 0 8px gold);
}

.stats p {
    font-size: 1.1rem;
    margin: 5px 0;
}

/* Responsive */
@media (max-width: 600px) {
    #hud {
        padding: 5px 10px;
        width: 98%;
        top: 10px;
    }
    
    .hud-item .value {
        font-size: 1rem;
    }

    .hud-item .label {
        font-size: 0.6rem;
    }
    
    .glass-panel {
        padding: 15px;
    }

    .glow-text {
        font-size: 2rem;
    }

    #game-container {
        margin-top: 60px;
        padding: 10px;
        height: calc(100% - 70px);
    }
}