/* 1. Modern CSS Reset */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
}

/* 2. Color Tokens: Light & Dark Mode */
:root {
    --bg: #f0f4ff;
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --fg: #2d3748;
    --accent: #667eea;
    --card-bg: #ffffff;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.15);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #1a202c;
        --bg-gradient: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
        --fg: #f7fafc;
        --accent: #9f7aea;
        --card-bg: #2d3748;
        --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.4);
    }
}

body {
    background: var(--bg-gradient);
    color: var(--fg);
    font-family: 'Inter', system-ui, sans-serif;
    min-height: 100vh;
}

/* Header Styles */
header {
    text-align: center;
    padding: 3rem 2rem 2rem;
    position: relative;
}

.logo {
    max-width: 300px;
    height: auto;
    margin: 0 auto 1.5rem;
    display: block;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

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

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

header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(45deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

/* 3. Card Grid Layout */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    padding: 2rem;
    max-width: 1400px;
    margin: auto;
}

/* 4. Card Styles */
.card, .game-card {
    background: var(--card-bg);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    transform: translateY(0);
}

.game-card a {
    text-decoration: none;
    color: inherit;
    display: block;
}

.card:hover, .game-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-hover);
}

.card::before, .game-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.card:hover::before, .game-card:hover::before {
    transform: scaleX(1);
}

/* 5. Card Thumbnail */
.card__thumb {
    aspect-ratio: 3/2;
    width: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}

.card:hover .card__thumb {
    transform: scale(1.05);
}

/* 6. Card Title and Info */
.card__title {
    padding: 1rem 1.25rem;
    font: 700 1.125rem/1.4 'Inter', sans-serif;
    text-align: center;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
}

.game-card__info {
    padding: 0.5rem 1.25rem 1rem;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    text-align: center;
}

/* Highscore Actions */
.highscore-actions {
    text-align: center;
    padding: 1rem 2rem;
}

.highscore-button {
    display: inline-block;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.highscore-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
    background: linear-gradient(135deg, #764ba2, #667eea);
}

/* Footer */
footer {
    text-align: center;
    padding: 3rem 2rem;
    opacity: 0.8;
}

/* 7. Accessibility: Prefer Reduced Motion */
@media (prefers-reduced-motion: reduce) {

    .card,
    .card__thumb,
    .logo {
        transition: none;
        animation: none;
    }

    .card:hover {
        transform: translateY(-4px);
    }

    .card:hover .card__thumb {
        transform: none;
    }
}

/* Loading animation for cards */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card, .game-card {
    animation: fadeInUp 0.6s ease-out backwards;
}

.card:nth-child(1), .game-card:nth-child(1) {
    animation-delay: 0.1s;
}

.card:nth-child(2), .game-card:nth-child(2) {
    animation-delay: 0.2s;
}

.card:nth-child(3), .game-card:nth-child(3) {
    animation-delay: 0.3s;
}

.card:nth-child(4), .game-card:nth-child(4) {
    animation-delay: 0.4s;
}

.card:nth-child(5), .game-card:nth-child(5) {
    animation-delay: 0.5s;
}

.card:nth-child(6), .game-card:nth-child(6) {
    animation-delay: 0.6s;
}

.card:nth-child(7), .game-card:nth-child(7) {
    animation-delay: 0.7s;
}

.card:nth-child(8), .game-card:nth-child(8) {
    animation-delay: 0.8s;
}

.card:nth-child(9), .game-card:nth-child(9) {
    animation-delay: 0.9s;
}