:root {
    --bg-base: #0a0a16;
    --neon-blue: #00f0ff;
    --neon-purple: #bd00ff;
    --cyber-pink: #ff007f;
    --aqua-cyan: #00f0ff;
    --card-bg-back: rgba(20, 20, 40, 0.7);
    --card-bg-front: rgba(30, 30, 60, 0.9);
    --text-main: #f8fafc;
    --text-dim: #94a3b8;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-base);
    color: var(--text-main);
    overflow: hidden;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    display: flex;
    justify-content: center;
    align-items: center;
    perspective: 1000px;
}

/* Background Effects */
.bg-fx {
    position: fixed;
    inset: 0;
    z-index: -2;
    overflow: hidden;
    background: radial-gradient(circle at center, #13132b 0%, #0a0a16 100%);
}
.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.5;
    animation: float 15s infinite alternate ease-in-out;
}
.orb-1 {
    width: 40vw;
    height: 40vw;
    background: rgba(0, 240, 255, 0.3);
    top: -10vw;
    left: -10vw;
}
.orb-2 {
    width: 50vw;
    height: 50vw;
    background: rgba(189, 0, 255, 0.2);
    bottom: -20vw;
    right: -10vw;
    animation-delay: -5s;
}
.orb-3 {
    width: 30vw;
    height: 30vw;
    background: rgba(255, 0, 127, 0.2);
    top: 40%;
    left: 40%;
    animation-duration: 20s;
}
.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    transform: perspective(500px) rotateX(60deg) scale(2.5) translateY(-100px);
    transform-origin: center top;
    opacity: 0.3;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(10vw, 5vh) scale(1.1); }
}

/* Canvas Effects */
#fx-canvas {
    position: fixed;
    inset: 0;
    z-index: 100;
    pointer-events: none;
}

/* App Container */
#app {
    width: 100%;
    max-width: 600px;
    height: 100%;
    position: relative;
    display: flex;
    flex-direction: column;
}

/* Screens */
.screen {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s ease;
    z-index: 10;
}
.screen.active {
    opacity: 1;
    pointer-events: auto;
}

/* Home Screen */
#screen-home {
    justify-content: center;
    align-items: center;
    padding: 2rem;
    text-align: center;
}
.title-container {
    margin-bottom: 4rem;
}
.logo-text {
    font-size: 4.5rem;
    font-weight: 900;
    line-height: 1;
    letter-spacing: -2px;
    background: linear-gradient(135deg, #fff, #e2e8f0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 15px rgba(255,255,255,0.2));
}
.logo-text .accent {
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 20px rgba(0, 240, 255, 0.4));
}
.logo-subtitle {
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 5px;
    color: var(--neon-blue);
    margin-top: 1rem;
    text-transform: uppercase;
}
.home-stats {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}
.stat-box {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(12px);
    border-radius: 16px;
    padding: 1rem 1.5rem;
    display: flex;
    flex-direction: column;
    min-width: 120px;
}
.stat-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-dim);
    letter-spacing: 2px;
}
.stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: #fff;
}

/* Buttons */
.action-btn {
    position: relative;
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
    border: none;
    border-radius: 30px;
    padding: 1.25rem 3.5rem;
    font-size: 1.25rem;
    font-weight: 800;
    color: #fff;
    cursor: pointer;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(189, 0, 255, 0.4), inset 0 2px 4px rgba(255,255,255,0.3);
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s;
}
.action-btn:active {
    transform: scale(0.95);
    box-shadow: 0 5px 15px rgba(189, 0, 255, 0.4);
}
.btn-text {
    position: relative;
    z-index: 2;
    letter-spacing: 2px;
}
.btn-shine {
    position: absolute;
    top: 0;
    left: -100%;
    width: 50%;
    height: 100%;
    background: linear-gradient(to right, rgba(255,255,255,0) 0%, rgba(255,255,255,0.4) 50%, rgba(255,255,255,0) 100%);
    transform: skewX(-20deg);
    z-index: 1;
    animation: shine 3s infinite;
}
@keyframes shine {
    0% { left: -100%; }
    20% { left: 200%; }
    100% { left: 200%; }
}
.text-btn {
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 1rem;
    font-weight: 700;
    margin-top: 1rem;
    cursor: pointer;
    padding: 0.5rem 1rem;
    letter-spacing: 1px;
    transition: color 0.2s;
}
.text-btn:active {
    color: #fff;
}

/* Game Screen */
#screen-game {
    display: flex;
    flex-direction: column;
    padding: env(safe-area-inset-top, 1rem) 1rem env(safe-area-inset-bottom, 1rem);
}
.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    flex: 0 0 auto;
}
.header-left, .header-right {
    display: flex;
    gap: 0.5rem;
}
.score-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 0.5rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 70px;
}
.score-card .label {
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--text-dim);
    letter-spacing: 1px;
}
.score-card .value {
    font-size: 1.25rem;
    font-weight: 800;
    color: #fff;
}
.combo-text {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--cyber-pink);
    text-transform: uppercase;
    font-style: italic;
    text-shadow: 0 0 15px rgba(255, 0, 127, 0.6);
    opacity: 0;
    transform: scale(0.5);
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: absolute;
    left: 50%;
    top: 5rem;
    margin-left: -50px;
    width: 100px;
    text-align: center;
    pointer-events: none;
    z-index: 50;
}
.combo-text.show {
    opacity: 1;
    transform: scale(1);
    animation: comboPulse 0.5s alternate infinite;
}
@keyframes comboPulse {
    0% { transform: scale(1); }
    100% { transform: scale(1.1); }
}

/* Board */
.board-wrapper {
    flex: 1 1 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    perspective: 1000px;
}
.card-grid {
    display: grid;
    gap: 10px;
    /* Grid template set dynamically via JS */
    width: 100%;
    max-width: 500px;
    max-height: 100%;
    aspect-ratio: 1; /* Approximate, JS will adjust */
    padding: 10px;
}

/* Cards */
.memory-card {
    position: relative;
    width: 100%;
    height: 100%;
    aspect-ratio: 1;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.4, 0.0, 0.2, 1);
    cursor: pointer;
}

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

.memory-card.matched {
    transform: rotateY(180deg) scale(1.05);
    opacity: 0;
    transition: transform 0.4s, opacity 0.4s;
    transition-delay: 0.5s;
    pointer-events: none;
}

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

.card-back {
    background: var(--card-bg-back);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    background-image: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, transparent 100%);
}

.card-back::after {
    content: '';
    position: absolute;
    width: 40%;
    height: 40%;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%23ffffff33"><path d="M12 2L2 22h20L12 2zm0 3.8l6.5 13.2H5.5L12 5.8z"/></svg>') no-repeat center;
    background-size: contain;
}

.card-front {
    background: var(--card-bg-front);
    transform: rotateY(180deg);
    border: 1px solid rgba(0, 240, 255, 0.3);
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.1), inset 0 0 20px rgba(0, 240, 255, 0.1);
}

.card-front .material-icons {
    font-size: 3rem;
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 10px var(--neon-blue));
}

.memory-card.error .card-front {
    border-color: rgba(255, 0, 127, 0.5);
    box-shadow: 0 0 20px rgba(255, 0, 127, 0.2), inset 0 0 20px rgba(255, 0, 127, 0.2);
    animation: shake 0.4s ease-in-out;
}
.memory-card.error .card-front .material-icons {
    background: linear-gradient(135deg, #ff007f, #ff7a00);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 10px #ff007f);
}

@keyframes shake {
    0%, 100% { transform: rotateY(180deg) translateX(0); }
    20% { transform: rotateY(180deg) translateX(-5px); }
    40% { transform: rotateY(180deg) translateX(5px); }
    60% { transform: rotateY(180deg) translateX(-5px); }
    80% { transform: rotateY(180deg) translateX(5px); }
}

/* Footer */
.game-footer {
    flex: 0 0 auto;
    padding: 1rem 0;
    display: flex;
    justify-content: center;
}

/* Game Over Modal */
.glass-modal {
    background: rgba(10, 10, 22, 0.85);
    backdrop-filter: blur(15px);
    justify-content: center;
    align-items: center;
    z-index: 200;
}
.modal-content {
    background: rgba(20, 20, 40, 0.9);
    border: 1px solid rgba(0, 240, 255, 0.2);
    padding: 3rem 2rem;
    border-radius: 24px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5), 0 0 40px rgba(0, 240, 255, 0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 90%;
    max-width: 380px;
    transform: scale(0.9) translateY(20px);
    opacity: 0;
    transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.screen.active .modal-content {
    transform: scale(1) translateY(0);
    opacity: 1;
}
.gameover-title {
    font-size: 2rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 2rem;
    text-shadow: 0 0 15px rgba(255,255,255,0.3);
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 2.5rem;
    width: 100%;
}
.stat-item {
    background: rgba(0,0,0,0.3);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 12px;
    padding: 1rem;
}
.score-label {
    color: var(--text-dim);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
}
.score-value {
    font-size: 1.75rem;
    font-weight: 900;
    color: var(--neon-blue);
    line-height: 1;
    text-shadow: 0 0 10px rgba(0, 240, 255, 0.4);
}