/* --- General & Font Styles --- */
body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 1rem;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

/* --- Landing Page Styles --- */
.landing-page {
    position: relative;
    background-color: #0c0a09; /* Fallback color */
    overflow: hidden;
}

.background-video {
    position: fixed;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    z-index: 1;
    transform: translateX(-50%) translateY(-50%);
}

.video-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: 2;
}

.landing-container {
    text-align: center;
    perspective: 800px;
    position: relative;
    z-index: 3; /* Ensure content is above video and overlay */
}

.title-animation {
    display: flex;
    font-size: clamp(3rem, 15vw, 7rem);
    font-weight: 700;
    color: #fff;
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.6), 0 0 30px rgba(255, 255, 255, 0.4);
}

.title-animation span {
    display: inline-block;
    animation: flipIn 1.5s forwards;
    animation-delay: calc(0.1s * var(--i));
    opacity: 0;
    transform: rotateX(90deg);
}
.title-animation .space { width: 1ch; }

@keyframes flipIn {
    to { opacity: 1; transform: rotateX(0deg); }
}

.start-button {
    display: inline-block;
    margin-top: 3rem;
    padding: 1rem 2.5rem;
    background: linear-gradient(45deg, #f87171, #fb923c, #fbbf24, #a3e635, #4ade80, #34d399);
    background-size: 300% 300%;
    color: #111827;
    font-size: 1.25rem;
    font-weight: 700;
    text-decoration: none;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    opacity: 0;
    transform: translateY(20px) scale(1);
    animation: fadeIn 1s forwards 1.5s, rainbow-bg 4s ease-in-out infinite, pulse 2s infinite 2.5s;
    transition: transform 0.2s ease-out;
}
.start-button:hover { transform: scale(1.1); animation-play-state: paused; }

@keyframes fadeIn {
    to { opacity: 1; transform: translateY(0); }
}
@keyframes rainbow-bg {
    0% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } 100% { background-position: 0% 50%; }
}
@keyframes pulse {
    0% { transform: scale(1); } 50% { transform: scale(1.05); } 100% { transform: scale(1); }
}

/* --- Game Page Styles --- */
.game-page {
    background: linear-gradient(45deg, #818cf8, #c084fc, #f472b6, #fb7185);
    background-size: 400% 400%;
    animation: gradient-bg 15s ease infinite;
}
@keyframes gradient-bg {
    0% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } 100% { background-position: 0% 50%; }
}

#confetti-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 100;
    pointer-events: none; /* Allows clicking through the canvas */
}

.container { width: 100%; max-width: 800px; margin: 0 auto; text-align: center; position: relative; z-index: 2; }

.game-header h1 { font-size: 2.5rem; font-weight: 700; color: #fff; text-shadow: 0 2px 4px rgba(0,0,0,0.2); margin-bottom: 0.5rem; }
.game-header p { font-size: 1.125rem; color: #e0e7ff; margin-top: 0; }

.game-info {
    display: flex;
    justify-content: space-around;
    align-items: center;
    max-width: 400px;
    margin: 1.5rem auto;
    padding: 1rem;
    background-color: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.info-item { text-align: center; }
.info-label { font-size: 0.875rem; color: #e0e7ff; }
.info-value { font-family: 'Roboto Mono', monospace; font-size: 1.875rem; font-weight: 700; color: #fff; margin: 0; }

.game-board { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; perspective: 1000px; }
.card { aspect-ratio: 1 / 1; position: relative; transform-style: preserve-3d; transition: transform 0.6s; cursor: pointer; }
.card.flipped { transform: rotateY(180deg); }

.card .front, .card .back {
    position: absolute; width: 100%; height: 100%; display: flex; justify-content: center; align-items: center; border-radius: 0.75rem; backface-visibility: hidden; -webkit-backface-visibility: hidden; transition: all 0.2s ease-in-out;
}

.card .back { background: rgba(255, 255, 255, 0.2); border: 2px solid rgba(255, 255, 255, 0.4); }
.card .back:hover { background: rgba(255, 255, 255, 0.3); }
.card .back svg { width: 40%; height: 40%; color: #e0e7ff; }

.card .front {
    background-color: #fff; box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2); font-size: clamp(2rem, 10vw, 3.5rem); transform: rotateY(180deg);
}

.card.matched { transform: rotateY(180deg); pointer-events: none; }
.card.matched .front { outline: 4px solid #34d399; outline-offset: -4px; }

.back-link { display: inline-block; margin-top: 2rem; color: #fff; text-decoration: none; font-weight: 500; }

/* --- Win Modal Styles --- */
.modal-overlay { position: fixed; inset: 0; background-color: rgba(0, 0, 0, 0.6); display: flex; align-items: center; justify-content: center; opacity: 1; transition: opacity 0.3s ease-in-out; z-index: 200; }
.modal-overlay.hidden { opacity: 0; pointer-events: none; }

.modal-content {
    background-color: white; border-radius: 1rem; box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25); padding: 2rem; text-align: center; transform: scale(0.7); transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1); width: 90%; max-width: 400px;
}
.modal-overlay:not(.hidden) .modal-content { transform: scale(1); }

.modal-content h2 { font-size: 2.5rem; font-weight: 700; color: #f59e0b; margin: 0 0 1rem; }
.congrats-message { color: #4b5563; margin: 0 0 1.5rem; }
.final-stats { display: flex; justify-content: space-around; margin-bottom: 2rem; }
.stat-value { font-family: 'Roboto Mono', monospace; font-size: 1.5rem; font-weight: 700; color: #1f2937; margin: 0; }

.play-again-button {
    width: 100%; background-color: #f472b6; color: white; font-weight: 700; padding: 0.75rem 1rem; border: none; border-radius: 0.5rem; cursor: pointer; transition: all 0.2s ease-in-out; transform: scale(1);
}
.play-again-button:hover { background-color: #db2777; transform: scale(1.05); }

/* --- Responsive Design --- */
@media (max-width: 640px) { .game-header h1 { font-size: 2rem; } .game-board { gap: 0.75rem; } }