html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden; 
}
body {
    font-family: 'Fredoka', system-ui, -apple-system, sans-serif;
    background-color: #18181b; 
    color: #f4f4f5; 
    display: flex;
    flex-direction: column;
}
.page-container {
    width: 100%;
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    min-height: 0;
}
.leaderboard-panel {
    display: none;
}
.game-wrapper {
    width: 100%;
    max-width: 64rem;
    margin: 0 auto;
    padding: 1rem;
    box-sizing: border-box;
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    min-height: 0;
}
footer {
    flex-shrink: 0;
    padding: 1rem;
    padding-top: 0;
    box-sizing: border-box;
}
.footer-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
}
.canvas-container {
    position: relative;
    width: 100%;
    flex-grow: 1; 
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 0;
    touch-action: none;
}
canvas {
    background-color: #27272a; border-radius: 0.75rem; cursor: crosshair;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5); transition: box-shadow 0.3s ease-in-out;
    max-width: 100%;
    max-height: 100%;
    aspect-ratio: 16 / 9;
    touch-action: none;
}
.shake { animation: screen-shake 0.15s ease-in-out; }
@keyframes screen-shake {
    0%, 100% { transform: translateX(0); } 25% { transform: translateX(-5px); }
    50% { transform: translateX(5px); } 75% { transform: translateX(-5px); }
}
.hud {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    gap: 0.75rem;
}
.hud-element {
    font-family: 'Fredoka', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    background: rgba(24, 24, 27, 0.85);
    backdrop-filter: blur(6px);
    padding: 0.5rem 1rem;
    border-radius: 0.75rem;
    border: 2px solid #52525b;
    letter-spacing: 0.5px;
    transition: color 0.3s, border-color 0.3s, transform 0.2s;
    white-space: nowrap;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}
.powered-up-timer { color: #facc15; border-color: #facc15; animation: pulse-effect 1s infinite; }
@keyframes pulse-effect { 50% { opacity: 0.6; } }
.integrity-container { flex-grow: 1; text-align: center; min-width: 100px; }
.hud-label {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    display: block;
    margin-bottom: 0.25rem;
    letter-spacing: 0.5px;
    color: #e4e4e7;
}
.integrity-bar {
    width: 100%; height: 1.35rem; background-color: rgba(0, 0, 0, 0.6);
    border: 2px solid #52525b; border-radius: 0.5rem; padding: 2px;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.5);
}
.integrity-fill {
    height: 100%; width: 100%; background-color: #22c55e;
    border-radius: 0.25rem; transition: width 0.3s ease-in-out, background-color 0.3s ease-in-out;
}
#waveWarning {
    position: absolute; top: 50%; left: 0; width: 100%;
    transform: translateY(-50%); text-align: center; font-size: 3.5rem; font-weight: 700; color: #ef4444;
    font-family: 'Fredoka', sans-serif;
    letter-spacing: 1px;
    text-shadow: 0 0 10px #f87171, 0 0 20px #ef4444; pointer-events: none;
    z-index: 100; animation: wave-pulse 1s infinite;
}
@keyframes wave-pulse {
    0%, 100% { transform: translateY(-50%) scale(1); opacity: 1; }
    50% { transform: translateY(-50%) scale(1.1); opacity: 0.8; }
}
#devourEffect {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    width: 10px; height: 10px; background-color: #2dd4bf; border-radius: 50%;
    pointer-events: none; z-index: 99;
}
.devour-animate { animation: devour-pulse 0.5s ease-out forwards; }
@keyframes devour-pulse {
    0% { transform: translate(-50%, -50%) scale(1); opacity: 0.8; }
    100% { transform: translate(-50%, -50%) scale(200); opacity: 0; }
}
#comboMeter {
    position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%);
    font-size: 2.2rem; font-weight: 700; color: #f59e0b;
    font-family: 'Fredoka', sans-serif;
    letter-spacing: 0.5px;
    text-shadow: 0 0 8px #fde047, 0 0 15px #f59e0b;
    pointer-events: none; z-index: 100; transition: opacity 0.3s, transform 0.2s;
}
.combo-pop { animation: combo-pop-animation 0.2s ease-out forwards; }
@keyframes combo-pop-animation {
    0% { transform: translateX(-50%) scale(1); }
    50% { transform: translateX(-50%) scale(1.2); }
    100% { transform: translateX(-50%) scale(1); }
}
.score-pop {
    position: absolute; font-size: 1.35rem; font-weight: 700; pointer-events: none;
    font-family: 'Fredoka', sans-serif;
    z-index: 101; animation: score-pop-animation 1s ease-out forwards;
}
.score-positive { color: #fde047; text-shadow: 0 0 5px #f59e0b; }
.score-negative { color: #f87171; text-shadow: 0 0 5px #ef4444; }
@keyframes score-pop-animation {
    0% { transform: translate(-50%, 0); opacity: 1; }
    100% { transform: translate(-50%, -50px); opacity: 0; }
}
.modal {
    position: absolute; inset: 0; background-color: rgba(10, 10, 12, 0.92);
    backdrop-filter: blur(10px);
    display: flex; flex-direction: column; align-items: center;
    padding: 1rem;
    border-radius: 0.75rem;
}
#startContent {
    display: flex; flex-direction: column;
    flex-grow: 1; min-height: 0; width: 100%;
}
.modal-header { flex-shrink: 0; padding-bottom: 0.5rem; text-align: center; }
.modal-body {
    flex-grow: 1; overflow-y: auto; width: 100%; min-height: 0;
}
#gameOverModal .modal-body, #mainLeaderboardModal .modal-body {
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
}
.modal-footer {
    flex-shrink: 0; padding-top: 0.75rem; display: flex;
    flex-direction: column; align-items: center; justify-content: center;
    gap: 0.75rem; width: 100%;
}
.modal-footer-buttons {
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    gap: 0.75rem; width: 100%; max-width: 28rem;
    margin: 0 auto;
}
#startGameBtn {
    margin: 0 auto;
}
@keyframes wiggle {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(-3deg) scale(1.03); }
    75% { transform: rotate(3deg) scale(1.03); }
}
@keyframes pulse-wiggle {
    0%, 100% { transform: scale(1) rotate(0deg); }
    20% { transform: scale(1.04) rotate(-2deg); }
    40% { transform: scale(1.04) rotate(2deg); }
    60% { transform: scale(1.02) rotate(-1deg); }
    80% { transform: scale(1.02) rotate(1deg); }
}
.modal-title {
    font-family: 'Fredoka', sans-serif;
    font-size: 2.75rem;
    letter-spacing: 1px;
    font-weight: 700;
    color: white;
    margin-bottom: 0.2rem;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}
.modal-subtitle {
    font-family: 'Fredoka', sans-serif;
    font-size: 1.25rem;
    letter-spacing: 0.5px;
    color: #facc15;
    font-weight: 600;
}
.game-over-title {
    font-family: 'Fredoka', sans-serif;
    font-size: 2.25rem;
    font-weight: 700;
}
.failure-title { color: #ef4444; }
.intro-box {
    width: 100%; max-width: 56rem; margin: 0 auto 0.75rem auto;
    padding: 0.75rem; background-color: rgba(24, 24, 27, 0.65);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0.85rem;
    display: flex; flex-direction: column; gap: 0.5rem;
}
.cards-hint {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.8rem;
    color: #a1a1aa;
    text-align: center;
    letter-spacing: 0.3px;
    font-weight: 500;
}
.cards-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.65rem;
    width: 100%;
}
@media (min-width: 640px) {
    .cards-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}
@media (min-width: 860px) {
    .cards-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}
.character-card {
    position: relative;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 0.85rem;
    padding: 0.65rem 0.5rem 0.6rem 0.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    cursor: pointer;
    user-select: none;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s ease, border-color 0.2s ease, background 0.2s ease;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}
.character-card:hover {
    animation: wiggle 0.4s ease-in-out;
    transform: translateY(-4px) scale(1.03);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.45);
}
.character-card:active {
    transform: scale(0.96);
}
#startGameBtn:hover {
    animation: pulse-wiggle 0.6s ease-in-out;
}
.card-hero { border-color: rgba(34, 211, 238, 0.4); }
.card-hero:hover { border-color: #22d3ee; box-shadow: 0 8px 24px rgba(34, 211, 238, 0.25); }
.card-ally { border-color: rgba(56, 189, 248, 0.35); }
.card-ally:hover { border-color: #38bdf8; box-shadow: 0 8px 24px rgba(56, 189, 248, 0.2); }
.card-bonus { border-color: rgba(251, 191, 36, 0.35); }
.card-bonus:hover { border-color: #fbbf24; box-shadow: 0 8px 24px rgba(251, 191, 36, 0.2); }
.card-threat { border-color: rgba(248, 113, 113, 0.35); }
.card-threat:hover { border-color: #f87171; box-shadow: 0 8px 24px rgba(248, 113, 113, 0.2); }
.card-caution { border-color: rgba(74, 222, 128, 0.35); }
.card-caution:hover { border-color: #4ade80; box-shadow: 0 8px 24px rgba(74, 222, 128, 0.2); }
.card-badge {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 0.15rem 0.55rem;
    border-radius: 9999px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 0.35rem;
    line-height: 1.2;
}
.badge-hero { background: rgba(34, 211, 238, 0.2); color: #67e8f9; border: 1px solid rgba(34, 211, 238, 0.4); }
.badge-ally { background: rgba(56, 189, 248, 0.2); color: #7dd3fc; border: 1px solid rgba(56, 189, 248, 0.4); }
.badge-bonus { background: rgba(251, 191, 36, 0.2); color: #fde047; border: 1px solid rgba(251, 191, 36, 0.4); }
.badge-threat { background: rgba(239, 68, 68, 0.2); color: #fca5a5; border: 1px solid rgba(239, 68, 68, 0.4); }
.badge-caution { background: rgba(34, 197, 94, 0.2); color: #86efac; border: 1px solid rgba(34, 197, 94, 0.4); }
.card-portrait, .icon-container {
    width: 3.5rem;
    height: 3.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.25);
    border-radius: 0.65rem;
    padding: 0.3rem;
    box-sizing: border-box;
    margin-bottom: 0.35rem;
    transition: transform 0.2s ease;
}
.character-card:hover .card-portrait, .character-card:hover .icon-container {
    transform: scale(1.08);
}
.card-img, .icon-container img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    display: block;
}
.card-name {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.95rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.2rem;
}
.card-ability {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.75rem;
    color: #d4d4d8;
    line-height: 1.25;
    font-weight: 500;
}
.guide-category-title {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: #facc15;
    padding: 0.25rem 0.25rem 0 0.25rem;
    text-transform: uppercase;
}
.guide-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
}
.cell-info-item {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 0.75rem;
    padding: 0.4rem 0.6rem;
    transition: transform 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}
.cell-info-item:hover {
    transform: translateY(-2px) scale(1.01);
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.22);
}
.cell-description {
    font-size: 0.95rem;
    line-height: 1.35;
    text-align: left;
    font-weight: 500;
}
.leaderboard-box {
    width: 100%; max-width: 24rem; margin: auto;
    background: #18181b; padding: 1rem; border-radius: 0.75rem;
    border: 1px solid #3f3f46;
}
.player-name-input {
    font-family: 'Fredoka', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    background-color: #27272a; color: white; width: 100%;
    max-width: 28rem; text-align: center; padding: 0.6rem 1rem;
    border-radius: 0.65rem; border: 2px solid #52525b;
    transition: border-color 0.2s;
}
.player-name-input:focus { outline: none; border-color: #22c55e; }
#rankDisplay {
    display: flex; flex-direction: column; align-items: center;
    line-height: 1.2; animation: rank-fade-in 0.5s ease-out;
}
@keyframes rank-fade-in {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}
#rankLabel {
    font-family: 'Fredoka', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: #a1a1aa;
}
#rankValue {
    font-family: 'Fredoka', sans-serif;
    font-size: 2.75rem;
    font-weight: 700;
    color: #67e8f9;
}
.shake-input { animation: input-shake 0.4s; }
@keyframes input-shake {
  10%, 90% { transform: translateX(-3px); } 20%, 80% { transform: translateX(3px); }
  30%, 50%, 70% { transform: translateX(-3px); } 40%, 60% { transform: translateX(3px); }
}
.btn-primary, .btn-secondary {
    font-family: 'Fredoka', sans-serif;
    color: white; font-weight: 700; padding: 0.75rem 1.75rem;
    border-radius: 0.75rem; font-size: 1.2rem;
    letter-spacing: 0.5px;
    border: none;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.2s;
}
.btn-primary { background-color: #22c55e; }
.btn-primary:hover {
    background-color: #16a34a;
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 18px rgba(34, 197, 94, 0.4);
}
.btn-primary:active { transform: translateY(1px) scale(0.98); }
.btn-secondary { background-color: #3b82f6; }
.btn-secondary:hover {
    background-color: #2563eb;
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 18px rgba(59, 130, 246, 0.4);
}
.btn-secondary:active { transform: translateY(1px) scale(0.98); }
#backToMenuBtn, #backToMenuGameOverBtn { background-color: #4b5563; }
#backToMenuBtn:hover, #backToMenuGameOverBtn:hover {
    background-color: #374151;
    transform: translateY(-2px) scale(1.02);
}
.modal-body::-webkit-scrollbar { width: 8px; }
.modal-body::-webkit-scrollbar-track { background: #27272a; border-radius: 4px; }
.modal-body::-webkit-scrollbar-thumb { background-color: #facc15; border-radius: 6px; border: 2px solid #27272a; }
.lab-text { display: flex; flex-direction: column; align-items: flex-start; }
.lab-text-top { font-size: 0.65rem; line-height: 1; letter-spacing: 0.5px; }
.lab-text-bottom { font-size: 0.8rem; line-height: 1.2; font-weight: bold; }
.leaderboard-player {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 0;
}
.leaderboard-podium-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.55rem 0.75rem;
    margin-bottom: 0.5rem;
    border-radius: 0.65rem;
    background: rgba(255, 255, 255, 0.04);
    transition: transform 0.15s ease-out;
}
.leaderboard-podium-card:hover {
    transform: translateX(2px);
}
.podium-rank-1 {
    background: linear-gradient(90deg, rgba(250, 204, 21, 0.2) 0%, rgba(35, 12, 50, 0.7) 100%);
    border: 1.5px solid rgba(250, 204, 21, 0.6);
    box-shadow: 0 4px 15px rgba(250, 204, 21, 0.2);
}
.podium-rank-2 {
    background: linear-gradient(90deg, rgba(203, 213, 225, 0.16) 0%, rgba(35, 12, 50, 0.7) 100%);
    border: 1.5px solid rgba(203, 213, 225, 0.5);
    box-shadow: 0 3px 12px rgba(203, 213, 225, 0.15);
}
.podium-rank-3 {
    background: linear-gradient(90deg, rgba(217, 119, 6, 0.16) 0%, rgba(35, 12, 50, 0.7) 100%);
    border: 1.5px solid rgba(217, 119, 6, 0.5);
    box-shadow: 0 3px 12px rgba(217, 119, 6, 0.15);
}
.podium-badge {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Fredoka', sans-serif;
    font-weight: 700;
    font-size: 0.95rem;
    flex-shrink: 0;
}
.podium-badge.rank-1 {
    background: linear-gradient(135deg, #facc15 0%, #ca8a04 100%);
    color: #1e092b;
    box-shadow: 0 0 10px rgba(250, 204, 21, 0.6);
}
.podium-badge.rank-2 {
    background: linear-gradient(135deg, #f1f5f9 0%, #94a3b8 100%);
    color: #0f172a;
    box-shadow: 0 0 10px rgba(203, 213, 225, 0.5);
}
.podium-badge.rank-3 {
    background: linear-gradient(135deg, #f59e0b 0%, #b45309 100%);
    color: #ffffff;
    box-shadow: 0 0 10px rgba(217, 119, 6, 0.5);
}
.podium-player-info {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
    min-width: 0;
}
.podium-player-info .player-name {
    font-weight: 700;
    font-size: 0.95rem;
    color: #ffffff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.podium-rank-tag {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: #a1a1aa;
    text-transform: uppercase;
}
.podium-open {
    border-style: dashed;
    opacity: 0.55;
}
.player-name-empty {
    color: #71717a;
    font-style: italic;
    font-size: 0.85rem;
}
.player-score-empty {
    color: #52525b;
}
.score-glow-1 {
    color: #facc15;
    font-weight: 700;
    text-shadow: 0 0 10px rgba(250, 204, 21, 0.4);
}
.score-glow-2 {
    color: #e2e8f0;
    font-weight: 700;
}
.score-glow-3 {
    color: #fbbf24;
    font-weight: 700;
}
.leaderboard-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.45rem 0.75rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: background-color 0.15s;
}
.leaderboard-row:hover {
    background-color: rgba(255, 255, 255, 0.03);
}
.leaderboard-row .rank-badge {
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Fredoka', sans-serif;
    font-weight: 700;
    font-size: 0.85rem;
    color: #9ca3af;
    flex-shrink: 0;
}
.leaderboard-row .player-name {
    font-size: 0.88rem;
    color: #e4e4e7;
    font-weight: 600;
}
.leaderboard-row .player-score {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.95rem;
    font-weight: 700;
    color: #cbd5e1;
}
.leaderboard-tip {
    margin-top: 0.75rem;
    padding: 0.65rem 0.75rem;
    background: rgba(250, 204, 21, 0.08);
    border: 1px dashed rgba(250, 204, 21, 0.35);
    border-radius: 0.65rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Fredoka', sans-serif;
    font-size: 0.75rem;
    color: #fef08a;
    line-height: 1.3;
}
.leaderboard-tip-icon {
    width: 1.5rem;
    height: 1.5rem;
    flex-shrink: 0;
}
.leaderboard-empty {
    padding: 1.5rem 0.5rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
}
.leaderboard-trophy-badge {
    margin-bottom: 0.25rem;
}
.leaderboard-empty-title {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.9rem;
    font-weight: 700;
    color: #facc15;
    letter-spacing: 0.5px;
}
.leaderboard-subtext {
    font-size: 0.8rem;
    color: #a1a1aa;
}
.modal.hidden,
#factModal.hidden,
#howToModal.hidden,
#startGameModal.hidden,
#gameOverModal.hidden,
#mainLeaderboardModal.hidden {
    display: none !important;
}
.tutorial-corner-btn {
    position: absolute;
    top: 1rem;
    left: 1rem;
    right: auto;
    z-index: 20;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-family: 'Fredoka', sans-serif;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: #f4f4f5;
    background: rgba(124, 58, 237, 0.35);
    border: 1.5px solid #a855f7;
    border-radius: 9999px;
    padding: 0.35rem 1rem;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    transition: all 0.2s;
}
.tutorial-corner-btn:hover {
    background: #7c3aed;
    color: #ffffff;
    box-shadow: 0 0 15px rgba(168, 85, 247, 0.6);
    transform: translateY(-1px);
}
#howToModal {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem 1rem;
    box-sizing: border-box;
}
#howToModal.hidden {
    display: none !important;
}
.how-to-card {
    position: relative;
    background: #18181b;
    border: 2px solid #a855f7;
    border-radius: 1.25rem;
    padding: 1.5rem 1.5rem 1.25rem 1.5rem;
    max-width: 48rem;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.65);
    animation: scale-up 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
    margin: auto;
    box-sizing: border-box;
}
.how-to-card .modal-header {
    padding-bottom: 0.75rem;
}
.how-to-card .modal-title {
    font-size: 2.25rem;
    margin-bottom: 0.15rem;
}
.how-to-card .modal-subtitle {
    font-size: 1.15rem;
    margin-bottom: 0.75rem;
}
.how-to-card .modal-footer {
    padding-top: 1rem;
}
.tutorial-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    max-width: 48rem;
    width: 100%;
    margin: 0 auto;
}
.tutorial-card {
    background: rgba(255, 255, 255, 0.04);
    border: 1.5px solid rgba(168, 85, 247, 0.3);
    border-radius: 0.75rem;
    padding: 0.75rem;
    display: flex;
    gap: 0.65rem;
    align-items: center;
    text-align: left;
}
.tutorial-step {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: #7c3aed;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Fredoka', sans-serif;
    font-size: 0.85rem;
    font-weight: 700;
    flex-shrink: 0;
}
.tutorial-step-img {
    width: 2.75rem;
    height: 2.75rem;
    flex-shrink: 0;
}
.tutorial-title {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 0.15rem;
}
.tutorial-desc {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.78rem;
    color: #d4d4d8;
    line-height: 1.35;
    margin: 0;
}
#factModal {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}
#factModal.hidden {
    display: none !important;
}
.fact-card {
    position: relative;
    background: #18181b;
    border: 2px solid #38bdf8;
    border-radius: 1.25rem;
    padding: 1.5rem;
    max-width: 24rem;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.6);
    animation: fact-pop 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes fact-pop {
    0% { transform: scale(0.85); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}
.fact-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}
.fact-close-btn {
    background: transparent;
    border: none;
    color: #a1a1aa;
    font-size: 1.75rem;
    line-height: 1;
    cursor: pointer;
    padding: 0 0.25rem;
    transition: color 0.15s;
}
.fact-close-btn:hover {
    color: #ffffff;
}
.fact-portrait {
    width: 5.5rem;
    height: 5.5rem;
    background: rgba(0, 0, 0, 0.35);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    margin-bottom: 0.85rem;
    animation: wiggle 2s infinite ease-in-out;
}
.fact-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}
.fact-title {
    font-family: 'Fredoka', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 0.5rem;
}
.fact-text {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.95rem;
    color: #e4e4e7;
    line-height: 1.45;
    margin-bottom: 1.25rem;
}
.fact-btn {
    min-width: 8rem;
    padding: 0.65rem 1.5rem;
}
@media (min-width: 768px) {
    .guide-grid {
        grid-template-columns: repeat(2, 1fr);
        column-gap: 0.75rem; row-gap: 0.5rem;
    }
    .modal-footer-buttons {
        flex-direction: row;
        justify-content: center;
        align-items: center;
    }
}
@media (max-width: 640px) {
    .hud {
        display: grid;
        grid-template-areas:
            "score time"
            "integrity integrity";
        grid-template-columns: 1fr 1fr;
        row-gap: 0.5rem;
        align-items: center;
    }
    #scoreContainer { grid-area: score; justify-self: start; }
    .integrity-container { grid-area: integrity; }
    #timeContainer { grid-area: time; justify-self: end; }
    .hud-mute-button { display: none; } 
    .modal-title { font-size: 2rem; }
    .modal-subtitle { font-size: 1.1rem; }
    .game-over-title { font-size: 1.75rem; }
    .icon-container { width: 2.75rem; height: 2.75rem; }
    .cell-description { font-size: 0.8rem; }
    .btn-primary, .btn-secondary { font-size: 1.05rem; padding: 0.6rem 1.2rem; }
    .hud-label { display: none; }
    #waveWarning { font-size: 2.2rem; }
    #comboMeter { font-size: 1.6rem; }
    .score-pop { font-size: 1.1rem; }
    #rankLabel { font-size: 1rem; }
    #rankValue { font-size: 2.2rem; }
}
@media (min-width: 1024px) {
    .page-container {
        display: grid;
        grid-template-columns: minmax(0, 3.2fr) minmax(0, 1fr);
        width: 100%;
        max-width: 86rem;
        margin: 0 auto;
        padding: 0.75rem 1rem;
        gap: 1.25rem;
        flex: 1 1 auto;
        min-height: 0;
        box-sizing: border-box;
        align-items: stretch;
    }
    .game-wrapper {
        max-width: 100%;
        padding: 0;
    }
    .leaderboard-panel {
        display: flex;
        flex-direction: column;
        background-color: rgba(24, 24, 27, 0.85);
        backdrop-filter: blur(8px);
        border-radius: 0.75rem;
        padding: 1rem;
        border: 2px solid #52525b;
        min-height: 0;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    }
    .leaderboard-panel-title {
        font-family: 'Fredoka', sans-serif;
        font-size: 1.35rem;
        font-weight: 700;
        color: #facc15;
        margin: 0 0 0.75rem 0;
        text-align: center;
        letter-spacing: 0.5px;
    }
    #desktopLeaderboardList {
        overflow-y: auto;
        flex-grow: 1;
        min-height: 0;
        background: transparent;
        border: none;
        padding: 0;
        max-width: 100%;
    }
    #leaderboardBtn,
    #leaderboardGameOverBtn {
        display: none !important;
    }
}

.hud-mute-button {
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    transition: transform 0.15s ease, background-color 0.2s, border-color 0.2s;
}

.hud-mute-button:hover {
    transform: scale(1.06);
    background: rgba(39, 39, 42, 0.95);
    border-color: #a1a1aa;
}

.hud-mute-button:active {
    transform: scale(0.95);
}

.hud-mute-button svg {
    width: 1.25rem;
    height: 1.25rem;
    display: block;
}

#rotate-warning {
    display: none;
    position: fixed;
    inset: 0;
    background-color: #18181b;
    color: #f4f4f5;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    z-index: 200;
    padding: 1.5rem;
    font-family: 'Fredoka', sans-serif;
}

.rotate-icon {
    width: 4.5rem;
    height: 4.5rem;
    margin-bottom: 1.25rem;
    color: #38bdf8;
    animation: rotate-pulse 2s infinite ease-in-out;
}

@keyframes rotate-pulse {
    0%, 100% { transform: rotate(0deg) scale(1); }
    50% { transform: rotate(90deg) scale(1.08); }
}

@media screen and (max-width: 1023px) and (orientation: portrait) {
    .page-container, footer {
        display: none !important;
    }
    #rotate-warning {
        display: flex !important;
    }
}

@media screen and (max-height: 540px) and (orientation: landscape) {
    footer {
        display: none !important;
    }
    .page-container {
        padding: 0.25rem 0.5rem;
    }
    .game-wrapper {
        max-width: 100%;
        height: 100%;
    }
    .leaderboard-panel {
        display: none !important;
    }
    .hud {
        display: flex !important;
        flex-direction: row !important;
        justify-content: space-between !important;
        align-items: center !important;
        margin-bottom: 0.25rem !important;
        gap: 0.35rem !important;
    }
    .hud-element {
        font-size: 0.78rem;
        padding: 0.2rem 0.5rem;
        border-radius: 0.5rem;
    }
    .hud-label {
        display: none !important;
    }
    .integrity-container {
        min-width: 70px;
        max-width: 180px;
        flex-grow: 1;
    }
    .integrity-bar {
        height: 0.95rem;
        border-radius: 0.35rem;
    }
    .hud-mute-button {
        display: flex !important;
        padding: 0.2rem 0.4rem;
    }
    .canvas-container,
    .game-area-wrapper,
    #game-container {
        min-height: 0;
        flex: 1 1 auto;
    }
    canvas {
        max-height: 100%;
        max-width: 100%;
    }
    .modal {
        padding: 0.35rem 0.6rem;
    }
    .modal-header {
        padding-bottom: 0.15rem;
    }
    .modal-title {
        font-size: 1.3rem;
        line-height: 1.1;
    }
    .modal-subtitle {
        font-size: 0.7rem;
        margin: 0;
    }
    .tutorial-corner-btn {
        top: 0.35rem;
        left: 0.35rem;
        right: auto !important;
        padding: 0.2rem 0.5rem;
        font-size: 0.7rem;
    }
    .intro-box {
        padding: 0.3rem 0.4rem;
        margin-bottom: 0.25rem;
    }
    .cards-hint {
        font-size: 0.65rem;
        margin-bottom: 0.15rem;
    }
    .cards-grid {
        grid-template-columns: repeat(5, 1fr) !important;
        gap: 0.25rem;
    }
    .character-card {
        padding: 0.25rem 0.2rem;
        border-radius: 0.5rem;
    }
    .card-badge {
        font-size: 0.5rem;
        padding: 0.05rem 0.25rem;
        margin-bottom: 0.15rem;
    }
    .card-portrait, .icon-container {
        width: 2rem;
        height: 2rem;
        padding: 0.15rem;
        margin-bottom: 0.15rem;
    }
    .card-name {
        font-size: 0.65rem;
        margin-bottom: 0.05rem;
    }
    .card-ability {
        font-size: 0.56rem;
        line-height: 1.1;
    }
    .modal-footer {
        padding-top: 0.25rem;
    }
    .player-name-input {
        padding: 0.3rem 0.6rem;
        font-size: 0.85rem;
        max-width: 16rem;
        border-radius: 0.5rem;
    }
    .modal-footer-buttons {
        margin-top: 0.25rem;
        gap: 0.5rem;
    }
    .btn-primary, .btn-secondary {
        padding: 0.35rem 1rem;
        font-size: 0.88rem;
        border-radius: 0.5rem;
    }
    .game-over-title {
        font-size: 1.3rem;
    }
    .game-over-fact-card {
        padding: 0.35rem 0.6rem;
        max-width: 22rem;
        margin: 0.2rem auto;
    }
    .game-over-fact-portrait {
        width: 2.75rem;
        height: 2.75rem;
        margin-bottom: 0.2rem;
    }
    .game-over-fact-title {
        font-size: 0.95rem;
        margin-bottom: 0.15rem;
    }
    .game-over-fact-text {
        font-size: 0.72rem;
        line-height: 1.25;
    }
    #mainLeaderboardModal .modal-body,
    .how-to-card,
    .fact-card {
        max-height: 85vh;
        overflow-y: auto;
    }
    .tutorial-cards {
        grid-template-columns: repeat(3, 1fr) !important;
        gap: 0.35rem;
    }
    .tutorial-card {
        padding: 0.4rem;
    }
    .tutorial-step-img {
        width: 2rem;
        height: 2rem;
    }
}

.science-corner-btn {
    position: absolute;
    top: 1rem;
    left: auto;
    right: 1rem;
    z-index: 20;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-family: 'Fredoka', sans-serif;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: #f4f4f5;
    background: rgba(5, 150, 105, 0.35);
    border: 1.5px solid #34d399;
    border-radius: 9999px;
    padding: 0.35rem 1rem;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    transition: all 0.2s;
}
.science-corner-btn:hover {
    background: #059669;
    color: #ffffff;
    box-shadow: 0 0 15px rgba(52, 211, 153, 0.6);
    transform: translateY(-1px);
}
#scienceInfoModal {
    position: fixed;
    inset: 0;
    z-index: 110;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem 1rem;
    box-sizing: border-box;
}
#scienceInfoModal.hidden {
    display: none !important;
}
.science-info-card {
    position: relative;
    background: #18181b;
    border: 2px solid #34d399;
    border-radius: 1.25rem;
    padding: 1.5rem;
    max-width: 48rem;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.65);
    margin: auto;
}
.science-info-body {
    text-align: left;
    color: #d4d4d8;
    font-family: 'Fredoka', sans-serif;
    font-size: 0.85rem;
    line-height: 1.55;
    width: 100%;
}
.science-info-body h3 {
    color: #6ee7b7;
    font-size: 0.95rem;
    font-weight: 700;
    margin: 1rem 0 0.4rem 0;
}
.science-info-body p { margin: 0.5rem 0; }
.science-info-body ul {
    margin: 0.3rem 0 0.6rem 1.1rem;
    list-style: disc;
}
.science-info-body li { margin: 0.2rem 0; }
.science-info-body a {
    color: #38bdf8;
    text-decoration: underline;
}
.science-info-body a:hover { color: #7dd3fc; }
.science-grade { font-size: 0.8rem; color: #a1a1aa; }
@media (max-width: 1024px) {
    .science-corner-btn {
        top: 0.35rem;
        right: 0.35rem;
        left: auto !important;
        padding: 0.2rem 0.5rem;
        font-size: 0.7rem;
    }
}

.footer-legal {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.9rem;
    margin-top: 0.4rem;
    font-family: 'Fredoka', sans-serif;
    font-size: 0.7rem;
}
.footer-legal a, .footer-legal-btn {
    color: #71717a;
    text-decoration: none;
    background: none;
    border: none;
    padding: 0;
    font: inherit;
    cursor: pointer;
}
.footer-legal a:hover, .footer-legal-btn:hover { color: #34d399; }