:root {
    /* Kawaii Color Palette - Soft pastels */
    --bg-gradient: linear-gradient(135deg, #ffecd2 0%, #fcb69f 50%, #ffeaa7 100%);
    --bg-alt: linear-gradient(to bottom right, #a8edea 0%, #fed6e3 100%);

    --primary: #ff6b9d;
    --primary-light: #ffb3d0;
    --primary-dark: #e91e8c;
    --secondary: #74b9ff;
    --accent: #fdcb6e;
    --success: #a8e6cf;

    --p1-color: #ff7675;
    --p2-color: #74b9ff;

    --text-color: #5d5d5d;
    --text-light: #888;
    --card-bg: #ffffff;
    --card-back-1: #ff9ff3;
    --card-back-2: #f8a5c2;

    --font-main: 'Varela Round', sans-serif;
    --font-headers: 'Fredoka', cursive;

    --shadow-soft: 0 8px 32px rgba(255, 107, 157, 0.15);
    --shadow-card: 0 4px 15px rgba(0, 0, 0, 0.1);
    --shadow-btn: 0 6px 0 var(--primary-dark);

    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 12px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-main);
    background: var(--bg-gradient);
    background-attachment: fixed;
    min-height: 100vh;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Floating decorations */
body::before {
    content: '✨';
    position: fixed;
    top: 10%;
    left: 5%;
    font-size: 2rem;
    opacity: 0.3;
    animation: float-sparkle 4s ease-in-out infinite;
    pointer-events: none;
}

body::after {
    content: '🌸';
    position: fixed;
    bottom: 15%;
    right: 8%;
    font-size: 2.5rem;
    opacity: 0.3;
    animation: float-sparkle 5s ease-in-out infinite 1s;
    pointer-events: none;
}

@keyframes float-sparkle {

    0%,
    100% {
        transform: translateY(0) rotate(0deg);
    }

    50% {
        transform: translateY(-20px) rotate(10deg);
    }
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.flags {
    display: flex;
    gap: 0.5rem;
}

.flag-btn {
    background: white;
    border: 3px solid var(--primary-light);
    cursor: pointer;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0.7;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: var(--shadow-card);
    position: relative;
    padding: 2px;
    overflow: hidden;
}

.flag-btn img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 50%;
}

.flag-btn.active,
.flag-btn:hover {
    opacity: 1;
    transform: scale(1.1);
    border-color: var(--primary);
    box-shadow: 0 0 15px rgba(255, 107, 157, 0.4);
}

.icon-btn {
    background: white;
    border: 3px solid var(--primary-light);
    font-size: 1.3rem;
    cursor: pointer;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-soft);
}

.icon-btn:hover {
    transform: scale(1.1);
    border-color: var(--primary);
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}

.hidden {
    display: none !important;
}

/* Menu Screen */
#menu-screen {
    background: rgba(255, 255, 255, 0.9);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    text-align: center;
    width: 90%;
    max-width: 480px;
    backdrop-filter: blur(10px);
    border: 3px solid rgba(255, 107, 157, 0.2);
}

.game-title {
    font-family: var(--font-headers);
    font-size: 2.8rem;
    background: linear-gradient(135deg, var(--primary) 0%, #ff9ff3 50%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    text-shadow: none;
}

.game-subtitle {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.menu-group {
    margin-bottom: 1.8rem;
}

.menu-group h2 {
    color: var(--primary-dark);
    margin-bottom: 1rem;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 600;
}

.mode-selector,
.level-selector {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.mode-btn,
.level-btn {
    background: white;
    border: 3px solid #f0f0f0;
    border-radius: var(--radius-md);
    padding: 1rem 1.2rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: var(--shadow-card);
    min-width: 110px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.mode-btn .icon,
.level-btn .lvl-title {
    font-size: 1.8rem;
}

.mode-btn span:last-child,
.level-btn .lvl-desc {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-color);
}

.mode-btn:hover,
.level-btn:hover {
    transform: translateY(-8px) scale(1.05);
    box-shadow: 0 15px 35px rgba(255, 107, 157, 0.25);
    border-color: var(--primary-light);
}

.mode-btn.active,
.level-btn.active {
    border-color: var(--primary);
    background: linear-gradient(135deg, #fff5f8 0%, #fff 100%);
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 10px 25px rgba(255, 107, 157, 0.2);
}

.mode-btn .icon {
    font-size: 2.5rem;
    transition: transform 0.3s ease;
}

.mode-btn:hover .icon {
    transform: rotate(5deg) scale(1.1);
}

.big-btn {
    background: linear-gradient(135deg, var(--primary) 0%, #ff9ff3 100%);
    color: white;
    border: none;
    padding: 1rem 3rem;
    font-size: 1.4rem;
    border-radius: 50px;
    font-family: var(--font-headers);
    cursor: pointer;
    box-shadow: var(--shadow-btn);
    transition: all 0.2s ease;
    margin-top: 1rem;
    position: relative;
    overflow: hidden;
}

.big-btn::before {
    content: '✨';
    position: absolute;
    left: 20px;
    animation: sparkle-btn 2s infinite;
}

.big-btn::after {
    content: '✨';
    position: absolute;
    right: 20px;
    animation: sparkle-btn 2s infinite 0.5s;
}

@keyframes sparkle-btn {

    0%,
    100% {
        opacity: 0.5;
        transform: scale(0.8);
    }

    50% {
        opacity: 1;
        transform: scale(1.2);
    }
}

.big-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 0 var(--primary-dark);
}

.big-btn:active {
    transform: translateY(4px);
    box-shadow: none;
}

/* Game Board */
#game-screen {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.score-board {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    width: 100%;
    margin-bottom: 1.5rem;
    background: rgba(255, 255, 255, 0.85);
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
}

.player-score {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 1rem;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    border: 3px solid transparent;
    background: #f8f9fa;
}

.player-score.active {
    background: white;
    box-shadow: var(--shadow-card);
    transform: scale(1.05);
}

.player-1.active {
    border-color: var(--p1-color);
}

.player-2.active {
    border-color: var(--p2-color);
}

.player-1 .p-icon,
.player-1 .p-name {
    color: var(--p1-color);
}

.player-2 .p-icon,
.player-2 .p-name {
    color: var(--p2-color);
}

.p-icon {
    font-size: 1.8rem;
}

.p-info {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.p-name {
    font-weight: bold;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.p-points {
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--text-color);
}

.win-count {
    font-size: 0.8rem;
    background: var(--accent);
    padding: 0.2rem 0.5rem;
    border-radius: 20px;
    margin-left: 0.3rem;
}

.vs-badge {
    font-weight: 900;
    color: var(--primary);
    font-size: 1rem;
    padding: 0.3rem 0.8rem;
    background: rgba(255, 107, 157, 0.1);
    border-radius: 20px;
}

/* Timer */
.timer-display {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    margin-bottom: 1rem;
    font-family: var(--font-headers);
    font-size: 1.5rem;
    color: var(--primary-dark);
    border: 3px solid var(--primary-light);
}

.timer-display .timer-icon {
    font-size: 1.2rem;
}

/* Grid */
.grid-container {
    display: grid;
    gap: 0.8rem;
    justify-content: center;
    width: 100%;
    perspective: 1000px;
    margin-bottom: 1.5rem;
}

.grid-3x4 {
    grid-template-columns: repeat(3, 80px);
}

.grid-4x4 {
    grid-template-columns: repeat(4, 75px);
}

.grid-6x6 {
    grid-template-columns: repeat(6, 60px);
    gap: 0.5rem;
}

.card {
    background: transparent;
    cursor: pointer;
    aspect-ratio: 1;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

.card.matched {
    transform: rotateY(180deg);
    pointer-events: none;
}

.card.matched .card-front {
    background: linear-gradient(135deg, #a8e6cf 0%, #88d8b0 100%);
    border-color: #55efc4;
    animation: match-celebrate 0.6s ease-out;
}

@keyframes match-celebrate {
    0% {
        transform: rotateY(180deg) scale(1);
    }

    30% {
        transform: rotateY(180deg) scale(1.15);
    }

    60% {
        transform: rotateY(180deg) scale(0.95);
    }

    100% {
        transform: rotateY(180deg) scale(1);
    }
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: var(--radius-md);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.2rem;
    box-shadow: var(--shadow-card);
    border: 3px solid transparent;
}

.card-back {
    background: linear-gradient(135deg, var(--card-back-1) 0%, var(--card-back-2) 100%);
    border-color: rgba(255, 255, 255, 0.5);
    position: relative;
    overflow: hidden;
}

/* Kawaii face on card back */
.card-back::before {
    content: '♡';
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.6);
}

.card-front {
    background: white;
    transform: rotateY(180deg);
    border-color: #f0f0f0;
}

/* Adjust sizes for different grids */
.grid-4x4 .card-face {
    font-size: 2rem;
}

.grid-6x6 .card-face {
    font-size: 1.4rem;
    border-radius: var(--radius-sm);
}

.game-controls {
    display: flex;
    gap: 1rem;
}

.secondary-btn {
    background: white;
    color: var(--text-color);
    border: 3px solid #f0f0f0;
    padding: 0.8rem 1.5rem;
    border-radius: 30px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-card);
}

.secondary-btn:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
    color: var(--primary);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 182, 208, 0.4);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(8px);
}

.modal-content {
    background: white;
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-soft);
    max-width: 90%;
    border: 3px solid var(--primary-light);
    animation: modal-pop 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes modal-pop {
    0% {
        transform: scale(0.5);
        opacity: 0;
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.winner-avatar {
    font-size: 4rem;
    margin: 1rem 0;
    animation: bounce 1s infinite;
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.modal-content h2 {
    font-family: var(--font-headers);
    color: var(--primary-dark);
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.modal-content p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.time-result {
    background: var(--accent);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    display: inline-block;
    margin-bottom: 1rem;
    font-weight: bold;
}

/* Mobile adjustments */
@media (max-width: 600px) {
    .game-title {
        font-size: 2rem;
    }

    .grid-3x4 {
        grid-template-columns: repeat(3, 70px);
    }

    .grid-4x4 {
        grid-template-columns: repeat(4, 65px);
    }

    .grid-6x6 {
        grid-template-columns: repeat(6, 50px);
    }

    .card-face {
        font-size: 1.8rem;
    }

    .grid-6x6 .card-face {
        font-size: 1.2rem;
    }

    .score-board {
        flex-direction: column;
        gap: 0.5rem;
    }

    .vs-badge {
        display: none;
    }
}