:root {
    --multiplayer-page-bg-yellow: #FFDE00;
    --multiplayer-page-brand-pink: #FF2E93;
    --multiplayer-page-brand-purple: #7B2CBF;
    --multiplayer-page-brand-cyan: #00F5D4;
    --multiplayer-page-brand-orange: #FF6B00;
    --multiplayer-page-badge-green: #00E676;
    --multiplayer-page-dark: #181822;
    --multiplayer-page-card-bg: #FFFFFF;
    --multiplayer-page-border: 3.5px solid #181822;
    --multiplayer-page-shadow-sm: 3px 3px 0px #181822;
    --multiplayer-page-shadow-md: 5px 5px 0px #181822;
    --multiplayer-page-shadow-lg: 8px 8px 0px #181822;
    --multiplayer-page-font-cartoon: 'Arial Black', 'Impact', 'Trebuchet MS', system-ui, sans-serif;
}

body {
    background-color: var(--multiplayer-page-bg-yellow);
    background-image:
            radial-gradient(var(--multiplayer-page-brand-orange) 15%, transparent 16%),
            radial-gradient(var(--multiplayer-page-brand-orange) 15%, transparent 16%);
    background-size: 30px 30px;
    background-position: 0 0, 15px 15px;
    font-family: var(--multiplayer-page-font-cartoon);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* ==========================================================================
   2. KEYFRAME ANIMATIONS
   ========================================================================== */
@keyframes bobble {
    0%, 100% { transform: translateY(0) rotate(-1deg); }
    50% { transform: translateY(-8px) rotate(1deg); }
}

@keyframes pulse-btn {
    0% { transform: scale(1); }
    50% { transform: scale(1.04); }
    100% { transform: scale(1); }
}

@keyframes badge-glow {
    0%, 100% { filter: drop-shadow(0 0 2px var(--multiplayer-page-brand-cyan)); }
    50% { filter: drop-shadow(0 0 8px var(--multiplayer-page-brand-pink)); }
}

@keyframes float-tag {
    0%, 100% { transform: translateY(0deg); }
    50% { transform: translateY(-3px); }
}

.multiplayer-page{
    max-width: 1200px;
    margin: 24px auto 0;
    width: 100%;
    color: var(--multiplayer-page-dark);
}
.multiplayer-page .hero-section {
    margin: 24px auto 0;
    padding: 0 16px;
}

.multiplayer-page .hero-card {
    background: linear-gradient(135deg, var(--multiplayer-page-brand-purple) 0%, #480CA8 100%);
    border: var(--multiplayer-page-border);
    border-radius: 24px;
    padding: 32px 24px;
    color: white;
    box-shadow: var(--multiplayer-page-shadow-lg);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.multiplayer-page .hero-card::before {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: repeating-linear-gradient(
            45deg,
            transparent,
            transparent 15px,
            rgba(255, 255, 255, 0.05) 15px,
            rgba(255, 255, 255, 0.05) 30px
    );
    pointer-events: none;
}

.multiplayer-page .hero-pill {
    background: var(--multiplayer-page-bg-yellow);
    color: var(--multiplayer-page-dark);
    border: var(--multiplayer-page-border);
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 14px;
    text-transform: uppercase;
    box-shadow: var(--multiplayer-page-shadow-sm);
    margin-bottom: 12px;
    animation: bobble 3s infinite ease-in-out;
}

.multiplayer-page .hero-pill::before {
    content: "⚡ ";
}

.multiplayer-page .hero-title {
    font-size: clamp(32px, 6vw, 56px);
    line-height: 1.05;
    text-transform: uppercase;
    margin-bottom: 10px;
    text-shadow: 4px 4px 0px var(--multiplayer-page-dark);
    letter-spacing: 1px;
}

.multiplayer-page .hero-subtitle {
    font-size: clamp(14px, 2.5vw, 18px);
    max-width: 600px;
    opacity: 0.95;
    font-family: system-ui, sans-serif;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.4;
}

.multiplayer-page .hero-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
}

.multiplayer-page .hero-tag-item {
    background: var(--multiplayer-page-brand-pink);
    border: var(--multiplayer-page-border);
    color: white;
    padding: 6px 12px;
    border-radius: 10px;
    font-size: 12px;
    box-shadow: var(--multiplayer-page-shadow-sm);
}

.multiplayer-page .hero-tag-item:nth-child(1)::before { content: "🎮 "; }
.multiplayer-page .hero-tag-item:nth-child(2)::before { content: "⚔️ "; }
.multiplayer-page .hero-tag-item:nth-child(3)::before { content: "👥 "; }
.multiplayer-page .hero-tag-item:nth-child(4)::before { content: "🌐 "; }

/* ==========================================================================
   5. PURE CSS CATEGORY FILTER TABS
   ========================================================================== */
.multiplayer-page .filter-section {
    margin: 28px auto 0;
    padding: 0 16px;
}

/* Hide standard radio inputs */
.multiplayer-page .filter-radio {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

/* CSS Filtering Rules via :checked pseudo-class */
.multiplayer-page #tab-2p:checked ~ .game-grid .card:not([data-category*="2p"]),
.multiplayer-page #tab-io:checked ~ .game-grid .card:not([data-category*="io"]),
.multiplayer-page #tab-coop:checked ~ .game-grid .card:not([data-category*="coop"]) {
    display: none;
}

/* ==========================================================================
   6. GAME GRID & CARDS
   ========================================================================== */
.multiplayer-page .grid-container {
    max-width: 1200px;
    margin: 20px auto 40px;
    padding: 0 16px;
    width: 100%;
}

.multiplayer-page .game-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
}

.multiplayer-page .card {
    background: var(--multiplayer-page-card-bg);
    border: var(--multiplayer-page-border);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--multiplayer-page-shadow-md);
    display: flex;
    flex-direction: column;
    position: relative;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.multiplayer-page .card:hover {
    transform: translateY(-6px) rotate(-0.5deg);
    box-shadow: var(--multiplayer-page-shadow-lg);
}

.multiplayer-page .card-thumb-link {
    display: block;
    position: relative;
    width: 100%;
    padding-top: 62.5%; /* 16:10 aspect ratio */
    background: #222;
    overflow: hidden;
    border-bottom: var(--multiplayer-page-border);
}

.multiplayer-page .card-thumb-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.multiplayer-page .card:hover .card-thumb-img {
    transform: scale(1.08);
}

.multiplayer-page .card-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    border: 2.5px solid var(--multiplayer-page-dark);
    padding: 3px 8px;
    border-radius: 8px;
    font-size: 11px;
    text-transform: uppercase;
    box-shadow: 2px 2px 0px var(--multiplayer-page-dark);
    z-index: 2;
}

.multiplayer-page .card-badge.hot {
    background: var(--multiplayer-page-brand-pink);
    color: white;
}

.multiplayer-page .card-badge.new {
    background: var(--multiplayer-page-badge-green);
    color: var(--multiplayer-page-dark);
}

.multiplayer-page .card-badge.top {
    background: var(--multiplayer-page-bg-yellow);
    color: var(--multiplayer-page-dark);
}

.multiplayer-page .card-content {
    padding: 16px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.multiplayer-page .card-title {
    font-size: 18px;
    margin-bottom: 6px;
    line-height: 1.2;
}

.multiplayer-page .card-title a {
    color: var(--multiplayer-page-dark);
    text-decoration: none;
}

.multiplayer-page .card-title a:hover {
    color: var(--multiplayer-page-brand-purple);
}

.multiplayer-page .card-desc {
    font-family: system-ui, sans-serif;
    font-weight: 600;
    font-size: 13px;
    color: #555;
    margin-bottom: 14px;
    line-height: 1.35;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.multiplayer-page .card-meta {
    margin-top: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.multiplayer-page .player-count {
    font-size: 12px;
    color: var(--multiplayer-page-dark);
    display: flex;
    align-items: center;
    gap: 4px;
    background: #F0F0F5;
    padding: 4px 8px;
    border-radius: 6px;
    border: 1.5px solid var(--multiplayer-page-dark);
}

.multiplayer-page .player-count::before {
    content: "👥 ";
}

.multiplayer-page .btn-play {
    background: var(--multiplayer-page-bg-yellow);
    color: var(--multiplayer-page-dark);
    border: var(--multiplayer-page-border);
    padding: 8px 16px;
    border-radius: 10px;
    font-size: 14px;
    text-transform: uppercase;
    text-decoration: none;
    box-shadow: var(--multiplayer-page-shadow-sm);
    display: inline-block;
    text-align: center;
    transition: transform 0.1s ease, background 0.1s ease;
}

.multiplayer-page .btn-play:hover {
    background: var(--multiplayer-page-brand-cyan);
    transform: translate(-1px, -1px);
}

.multiplayer-page .btn-play:active {
    transform: translate(2px, 2px);
    box-shadow: 1px 1px 0px var(--multiplayer-page-dark);
}

/* 当未显示 player-count 时，PLAY 按钮占满整行 */
.multiplayer-page .card-meta:not(:has(.player-count)) .btn-play,
.multiplayer-page .btn-play:only-child {
    width: 100%;
}