html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
    box-sizing: border-box;
    user-select: none;
    -webkit-user-select: none;
}

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: 0.75rem 1rem;
    box-sizing: border-box;
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

footer {
    flex-shrink: 0;
    padding: 0.5rem 1rem;
    box-sizing: border-box;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
}

.footer-logo {
    height: 2rem;
    transition: transform 0.2s ease-in-out;
}

.footer-logo.large {
    height: 2.25rem;
}

.footer-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: #a1a1aa;
    transition: color 0.2s;
}

.footer-link:hover {
    color: #f4f4f5;
}

.footer-link:hover .footer-logo {
    transform: scale(1.08);
}

/* 2-Column Desktop Grid Layout */
@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 !important;
        flex-direction: column;
        background-color: rgba(24, 24, 27, 0.85);
        backdrop-filter: blur(8px);
        border-radius: 0.85rem;
        padding: 1rem;
        border: 2px solid #52525b;
        min-height: 0;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    }
}

/* In-game HUD */
.hud {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.65rem;
    gap: 0.75rem;
    flex-shrink: 0;
}

.hud-element {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.95rem;
    font-weight: 700;
    background: rgba(24, 24, 27, 0.85);
    backdrop-filter: blur(6px);
    padding: 0.45rem 0.9rem;
    border-radius: 0.75rem;
    border: 2px solid #52525b;
    letter-spacing: 0.5px;
    white-space: nowrap;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.hud-center {
    flex-grow: 1;
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.demand-bar-container {
    flex: 1;
    min-width: 70px;
}

.hud-label {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.78rem;
    font-weight: 700;
    display: block;
    margin-bottom: 0.2rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.demand-bar {
    width: 100%;
    height: 1.15rem;
    background-color: rgba(0, 0, 0, 0.6);
    border: 2px solid #52525b;
    border-radius: 0.45rem;
    padding: 2px;
    box-sizing: border-box;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

.demand-fill {
    height: 100%;
    width: 100%;
    border-radius: 0.2rem;
    transition: width 0.3s ease-in-out, background-color 0.3s ease-in-out;
}

#oxygen-fill { background-color: #ef4444; }
#immunity-fill { background-color: #60a5fa; }
#clotting-fill { background-color: #facc15; }

.demand-fill.critical {
    animation: critical-pulse 0.8s infinite alternate;
}

@keyframes critical-pulse {
    0% { opacity: 1; filter: brightness(1); }
    100% { opacity: 0.6; filter: brightness(1.4); }
}

.hud-mute-button {
    padding: 0.45rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: #e4e4e7;
    transition: border-color 0.2s, color 0.2s, transform 0.15s;
}

.hud-mute-button:hover {
    border-color: #22c55e;
    color: #22c55e;
    transform: scale(1.05);
}

/* Game Area Wrapper */
.game-area-wrapper {
    position: relative;
    width: 100%;
    flex-grow: 1;
    aspect-ratio: 16 / 9;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.85rem;
    overflow: hidden;
    background-color: #27272a;
    border: 2px solid #52525b;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    min-height: 0;
    touch-action: none;
}

.game-area-wrapper.shake {
    animation: screen-shake 0.18s ease-in-out;
}

@keyframes screen-shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    50% { transform: translateX(6px); }
    75% { transform: translateX(-6px); }
}

#game-area {
    width: 100%;
    height: 100%;
    position: relative;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    background: radial-gradient(circle at center, #27272a 0%, #1c1c1f 100%);
}

/* Differentiation Drop Zones */
#diff-zones-container {
    display: flex;
    flex-grow: 1;
    gap: 0.75rem;
    padding: 0.85rem;
    box-sizing: border-box;
}

.diff-zone {
    flex: 1;
    border-radius: 0.85rem;
    border: 2px dashed #52525b;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 0.5rem;
    text-align: center;
    transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-sizing: border-box;
    position: relative;
    overflow: hidden;
}

.zone-oxygen {
    background: rgba(239, 68, 68, 0.06);
    border-color: rgba(239, 68, 68, 0.35);
}

.zone-oxygen.hover {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.22);
    box-shadow: 0 0 24px rgba(239, 68, 68, 0.35), inset 0 0 16px rgba(239, 68, 68, 0.15);
    transform: scale(1.02);
}

.zone-immunity {
    background: rgba(96, 165, 250, 0.06);
    border-color: rgba(96, 165, 250, 0.35);
}

.zone-immunity.hover {
    border-color: #60a5fa;
    background: rgba(96, 165, 250, 0.22);
    box-shadow: 0 0 24px rgba(96, 165, 250, 0.35), inset 0 0 16px rgba(96, 165, 250, 0.15);
    transform: scale(1.02);
}

.zone-clotting {
    background: rgba(250, 204, 21, 0.06);
    border-color: rgba(250, 204, 21, 0.35);
}

.zone-clotting.hover {
    border-color: #facc15;
    background: rgba(250, 204, 21, 0.22);
    box-shadow: 0 0 24px rgba(250, 204, 21, 0.35), inset 0 0 16px rgba(250, 204, 21, 0.15);
    transform: scale(1.02);
}

.zone-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;
    pointer-events: none;
}

.badge-oxygen { background: rgba(239, 68, 68, 0.2); color: #fca5a5; border: 1px solid rgba(239, 68, 68, 0.4); }
.badge-immunity { background: rgba(96, 165, 250, 0.2); color: #93c5fd; border: 1px solid rgba(96, 165, 250, 0.4); }
.badge-clotting { background: rgba(250, 204, 21, 0.2); color: #fde047; border: 1px solid rgba(250, 204, 21, 0.4); }

.zone-icon-container {
    width: 3.5rem;
    height: 3.5rem;
    margin-bottom: 0.35rem;
    pointer-events: none;
    transition: transform 0.2s ease;
}

.diff-zone.hover .zone-icon-container {
    transform: scale(1.15);
}

.zone-icon {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    display: block;
    opacity: 0.85;
    transition: opacity 0.2s ease;
}

.diff-zone.hover .zone-icon {
    opacity: 1;
}

.zone-label {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.95rem;
    font-weight: 700;
    color: #f4f4f5;
    pointer-events: none;
    line-height: 1.2;
}

.zone-sublabel {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.72rem;
    font-weight: 500;
    color: #a1a1aa;
    pointer-events: none;
}

/* Stem Cell Incubator Pool */
#stem-cell-pool {
    height: 110px;
    flex-shrink: 0;
    background: rgba(15, 15, 18, 0.75);
    border-top: 2px solid #52525b;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0.5rem;
    position: relative;
    box-sizing: border-box;
}

.pool-hint {
    position: absolute;
    bottom: 0.35rem;
    font-family: 'Fredoka', sans-serif;
    font-size: 0.7rem;
    font-weight: 600;
    color: #71717a;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    pointer-events: none;
}

.hsc {
    width: 62px;
    height: 62px;
    cursor: grab;
    background-image: url('img/hsc.png');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    animation: pulse-hsc 1.5s infinite ease-in-out;
    position: absolute;
    transition: transform 0.1s ease-out, top 0.3s ease-out, left 0.3s ease-out;
    z-index: 900;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.5));
}

.hsc.myeloid {
    background-image: url('img/myeloid_cell.png');
}

.hsc.boost {
    background-image: url('img/boost_cell.png');
    animation: pulse-boost 1s infinite ease-in-out;
    filter: drop-shadow(0 0 10px rgba(167, 139, 250, 0.6));
}

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

@keyframes pulse-boost {
    0%, 100% { transform: scale(1) rotate(0deg); }
    50% { transform: scale(1.14) rotate(4deg); }
}

.hsc.dragging {
    cursor: grabbing;
    z-index: 1000;
    animation: none;
    transform: scale(1.22);
    transition: none;
    filter: drop-shadow(0 8px 18px rgba(0, 0, 0, 0.7));
}

/* Score Pop & Notifications */
#score-pop-container {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 101;
}

.score-pop {
    position: absolute;
    font-family: 'Fredoka', sans-serif;
    font-size: 1.35rem;
    font-weight: 700;
    pointer-events: none;
    animation: score-pop-animation 0.9s ease-out forwards;
}

.score-cell {
    color: #4ade80;
    text-shadow: 0 0 10px rgba(34, 197, 94, 0.7);
}

@keyframes score-pop-animation {
    0% { transform: translate(-50%, 0) scale(0.8); opacity: 0; }
    20% { transform: translate(-50%, -10px) scale(1.2); opacity: 1; }
    100% { transform: translate(-50%, -55px) scale(1); opacity: 0; }
}

#notification-container {
    position: absolute;
    top: 25%;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    pointer-events: none;
    z-index: 100;
}

.notification-item {
    font-family: 'Fredoka', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.9);
    background: rgba(15, 15, 18, 0.9);
    backdrop-filter: blur(8px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 9999px;
    padding: 0.4rem 1.25rem;
    animation: ready-pulse 0.5s ease-out, fade-in 0.3s ease-out;
    opacity: 1;
    transition: opacity 0.5s ease-out;
}

.notification-item.fade-out {
    opacity: 0;
}

.text-red { color: #f87171; }
.text-blue { color: #60a5fa; }
.text-yellow { color: #facc15; }
.text-pink { color: #f472b6; }
.text-myeloid { color: #f9a8d4; }
.text-boost { color: #c084fc; }

@keyframes ready-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

@keyframes fade-in {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Modals Core */
.modal {
    position: absolute;
    inset: 0;
    background-color: rgba(10, 10, 14, 0.94);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem;
    border-radius: 0.85rem;
    z-index: 100;
    box-sizing: border-box;
}

#startContent {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    min-height: 0;
    width: 100%;
}

.modal-header {
    flex-shrink: 0;
    padding-bottom: 0.35rem;
    text-align: center;
}

.modal-body {
    flex-grow: 1;
    overflow-y: auto;
    width: 100%;
    min-height: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.modal-footer {
    flex-shrink: 0;
    padding-top: 0.65rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.65rem;
    width: 100%;
}

.modal-footer-buttons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: 100%;
    max-width: 28rem;
    margin: 0 auto;
}

.modal-title {
    font-family: 'Fredoka', sans-serif;
    font-size: 2.2rem;
    letter-spacing: 1px;
    font-weight: 700;
    color: white;
    margin: 0 0 0.2rem 0;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.modal-subtitle {
    font-family: 'Fredoka', sans-serif;
    font-size: 1.1rem;
    letter-spacing: 0.5px;
    color: #facc15;
    font-weight: 600;
    margin: 0;
}

.game-over-title {
    font-family: 'Fredoka', sans-serif;
    font-size: 2rem;
    font-weight: 700;
}

.failure-title {
    color: #ef4444;
}

.final-score-text {
    font-family: 'Fredoka', sans-serif;
    font-size: 1.15rem;
    color: #f4f4f5;
    margin: 0.35rem 0;
    font-weight: 600;
}

.leaderboard-rank-text {
    font-family: 'Fredoka', sans-serif;
    font-size: 1rem;
    color: #facc15;
    margin: 0.25rem 0 0.5rem 0;
    font-weight: 600;
}

/* Character Intro Box & 3x2 Grid */
.intro-box {
    width: 100%;
    max-width: 54rem;
    margin: 0 auto;
    padding: 0.65rem;
    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: 0.45rem;
    box-sizing: border-box;
}

.cards-hint {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.8rem;
    color: #94a3b8;
    text-align: center;
    letter-spacing: 0.3px;
    font-weight: 500;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.55rem;
    width: 100%;
}

@media (min-width: 640px) {
    .cards-grid {
        grid-template-columns: repeat(3, 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: 0.55rem 0.45rem 0.5rem 0.45rem;
    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);
}

@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); }
}

.card-hero { border-color: rgba(244, 114, 182, 0.4); }
.card-hero:hover { border-color: #f472b6; box-shadow: 0 8px 24px rgba(244, 114, 182, 0.25); }

.card-ally { border-color: rgba(249, 168, 212, 0.4); }
.card-ally:hover { border-color: #f9a8d4; box-shadow: 0 8px 24px rgba(249, 168, 212, 0.25); }

.card-powerup { border-color: rgba(192, 132, 252, 0.4); }
.card-powerup:hover { border-color: #c084fc; box-shadow: 0 8px 24px rgba(192, 132, 252, 0.25); }

.card-oxygen { border-color: rgba(248, 113, 113, 0.4); }
.card-oxygen:hover { border-color: #f87171; box-shadow: 0 8px 24px rgba(248, 113, 113, 0.25); }

.card-immunity { border-color: rgba(96, 165, 250, 0.4); }
.card-immunity:hover { border-color: #60a5fa; box-shadow: 0 8px 24px rgba(96, 165, 250, 0.25); }

.card-clotting { border-color: rgba(250, 204, 21, 0.4); }
.card-clotting:hover { border-color: #facc15; box-shadow: 0 8px 24px rgba(250, 204, 21, 0.25); }

.card-badge {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.62rem;
    font-weight: 700;
    padding: 0.12rem 0.5rem;
    border-radius: 9999px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 0.3rem;
    line-height: 1.2;
}

.badge-hero { background: rgba(244, 114, 182, 0.2); color: #fbcfe8; border: 1px solid rgba(244, 114, 182, 0.4); }
.badge-ally { background: rgba(249, 168, 212, 0.2); color: #fce7f3; border: 1px solid rgba(249, 168, 212, 0.4); }
.badge-powerup { background: rgba(192, 132, 252, 0.2); color: #e9d5ff; border: 1px solid rgba(192, 132, 252, 0.4); }

.icon-container {
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.25);
    border-radius: 0.65rem;
    padding: 0.25rem;
    box-sizing: border-box;
    transition: transform 0.2s ease;
}

.card-portrait {
    width: 3.25rem;
    height: 3.25rem;
    margin-bottom: 0.25rem;
}

.character-card:hover .card-portrait {
    transform: scale(1.08);
}

.card-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: 0.85rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.15rem;
}

.card-ability {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.72rem;
    color: #d4d4d8;
    line-height: 1.2;
    font-weight: 500;
}

/* Corner Tutorial Button */
.tutorial-corner-btn {
    position: absolute;
    top: 0.85rem;
    left: 0.85rem;
    right: auto;
    z-index: 20;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1.5px solid rgba(6, 182, 212, 0.4);
    border-radius: 9999px;
    padding: 0.35rem 0.8rem;
    font-family: 'Fredoka', sans-serif;
    font-weight: 600;
    font-size: 0.8rem;
    color: #a5f3fc;
    cursor: pointer;
    backdrop-filter: blur(6px);
    transition: all 0.2s ease;
}

.tutorial-corner-btn:hover {
    background: rgba(6, 182, 212, 0.2);
    border-color: rgba(6, 182, 212, 0.8);
    transform: translateY(-2px) scale(1.03);
}

/* How to Play Modal Card */
.how-to-card {
    position: relative;
    width: 100%;
    max-width: 44rem;
    max-height: 90vh;
    margin: auto;
    overflow-y: auto;
    background: linear-gradient(135deg, rgba(28, 15, 38, 0.97) 0%, rgba(15, 10, 24, 0.98) 100%);
    border: 2px solid rgba(6, 182, 212, 0.45);
    border-radius: 1.15rem;
    padding: 1.25rem 1.5rem;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 30px rgba(6, 182, 212, 0.25);
    text-align: center;
    box-sizing: border-box;
}

.how-to-header-badge {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 0.2rem 0.65rem;
    border-radius: 9999px;
    background: rgba(6, 182, 212, 0.2);
    color: #67e8f9;
    border: 1px solid rgba(6, 182, 212, 0.4);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.how-to-subtitle {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.88rem;
    color: #cbd5e1;
    margin: 0.25rem 0 0.85rem 0;
}

.tutorial-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

@media (min-width: 640px) {
    .tutorial-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.tutorial-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 0.85rem;
    padding: 0.75rem 0.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    box-sizing: border-box;
}

.tutorial-step {
    position: absolute;
    top: 0.4rem;
    left: 0.4rem;
    width: 1.25rem;
    height: 1.25rem;
    border-radius: 9999px;
    background: #06b6d4;
    color: #082f49;
    font-family: 'Fredoka', sans-serif;
    font-weight: 700;
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tutorial-icon-box {
    width: 3.5rem;
    height: 3.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.4rem;
}

.tutorial-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.tutorial-title {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 0.2rem;
}

.tutorial-desc {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.75rem;
    color: #d4d4d8;
    line-height: 1.25;
    margin: 0;
}

/* Science Fact Modal */
.fact-card {
    position: relative;
    width: 100%;
    max-width: 26rem;
    background: linear-gradient(135deg, rgba(28, 15, 38, 0.97) 0%, rgba(15, 10, 24, 0.98) 100%);
    border: 2px solid rgba(244, 114, 182, 0.45);
    border-radius: 1.15rem;
    padding: 1.25rem;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 30px rgba(244, 114, 182, 0.25);
    text-align: center;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.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: #94a3b8;
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
    padding: 0.2rem;
    transition: color 0.15s ease;
}

.fact-close-btn:hover {
    color: #f4f4f5;
}

.fact-portrait {
    width: 4.5rem;
    height: 4.5rem;
    margin-bottom: 0.6rem;
}

.fact-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.fact-title {
    font-family: 'Fredoka', sans-serif;
    font-size: 1.25rem;
    font-weight: 700;
    color: #f4f4f5;
    margin: 0 0 0.4rem 0;
}

.fact-text {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.88rem;
    color: #cbd5e1;
    line-height: 1.4;
    margin: 0 0 1rem 0;
}

.fact-btn {
    width: 100%;
}

/* Science Fact Box in Game Over */
.science-fact-box {
    max-width: 32rem;
    margin: 0 auto;
    padding: 0.85rem 1.2rem;
    background: rgba(0, 0, 0, 0.25);
    border: 1.5px solid #52525b;
    border-radius: 0.75rem;
    text-align: center;
    box-sizing: border-box;
}

.science-fact-title {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.95rem;
    color: #facc15;
    font-weight: 700;
    margin: 0 0 0.35rem 0;
}

.science-fact-text {
    font-family: 'Fredoka', sans-serif;
    font-size: 0.85rem;
    color: #d4d4d8;
    line-height: 1.35;
    margin: 0;
}

/* Inputs & Buttons */
.player-name-input {
    font-family: 'Fredoka', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    background-color: #27272a;
    color: white;
    width: 100%;
    max-width: 24rem;
    text-align: center;
    padding: 0.55rem 1rem;
    border-radius: 0.65rem;
    border: 2px solid #52525b;
    transition: border-color 0.2s;
    box-sizing: border-box;
}

.player-name-input:focus {
    outline: none;
    border-color: #22c55e;
}

.player-name-input.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: 0.65rem 1.5rem;
    border-radius: 0.75rem;
    font-size: 1.05rem;
    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);
}

#start-game-btn:hover {
    animation: pulse-wiggle 0.6s ease-in-out;
}

/* Leaderboard Styling */
.leaderboard-panel-title {
    font-family: 'Fredoka', sans-serif;
    font-size: 1.35rem;
    text-align: center;
    margin: 0 0 0.75rem 0;
    color: #facc15;
    font-weight: 700;
}

.leaderboard-box {
    background: #18181b;
    padding: 0.65rem;
    border-radius: 0.65rem;
    font-size: 0.85rem;
    overflow-y: auto;
    flex-grow: 1;
    min-height: 0;
    border: 1px solid #3f3f46;
}

.leaderboard-podium-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.45rem 0.65rem;
    margin-bottom: 0.4rem;
    border-radius: 0.55rem;
    background: rgba(255, 255, 255, 0.04);
    font-family: 'Fredoka', sans-serif;
    font-weight: 600;
    transition: transform 0.15s ease, background-color 0.15s ease;
}

.leaderboard-podium-card:hover {
    transform: translateX(2px);
    background: rgba(255, 255, 255, 0.08);
}

.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);
}

.podium-rank-2 {
    background: linear-gradient(90deg, rgba(203, 213, 225, 0.2) 0%, rgba(20, 24, 38, 0.7) 100%);
    border: 1.5px solid rgba(203, 213, 225, 0.6);
}

.podium-rank-3 {
    background: linear-gradient(90deg, rgba(249, 115, 22, 0.2) 0%, rgba(35, 18, 12, 0.7) 100%);
    border: 1.5px solid rgba(249, 115, 22, 0.6);
}

.podium-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.35rem;
    height: 1.35rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-right: 0.45rem;
    background: #3f3f46;
    color: #e4e4e7;
}

.podium-badge.rank-1 {
    background: linear-gradient(135deg, #facc15 0%, #ca8a04 100%);
    color: #1e092b;
}

.podium-badge.rank-2 {
    background: linear-gradient(135deg, #e2e8f0 0%, #94a3b8 100%);
    color: #0f172a;
}

.podium-badge.rank-3 {
    background: linear-gradient(135deg, #fdba74 0%, #ea580c 100%);
    color: #2c0b02;
}

.leaderboard-tip {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(6, 182, 212, 0.1);
    border: 1px dashed rgba(6, 182, 212, 0.35);
    border-radius: 0.65rem;
    padding: 0.45rem 0.65rem;
    margin-top: 0.65rem;
    font-family: 'Fredoka', sans-serif;
    font-size: 0.75rem;
    color: #67e8f9;
}

.leaderboard-tip-icon {
    width: 1.4rem;
    height: 1.4rem;
    flex-shrink: 0;
}

/* Scrollbars */
.modal-body::-webkit-scrollbar,
.leaderboard-box::-webkit-scrollbar {
    width: 6px;
}

.modal-body::-webkit-scrollbar-track,
.leaderboard-box::-webkit-scrollbar-track {
    background: #18181b;
}

.modal-body::-webkit-scrollbar-thumb,
.leaderboard-box::-webkit-scrollbar-thumb {
    background-color: #facc15;
    border-radius: 4px;
}

/* Loading Modal */
.modal-loading-body {
    flex-grow: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading-text {
    font-family: 'Fredoka', sans-serif;
    font-size: 1.25rem;
    color: #f4f4f5;
}

/* Rotate Device Warning */
/* Specificity & Visibility Rules */
.hidden,
.modal.hidden,
#factModal.hidden,
#howToModal.hidden,
#mainLeaderboardModal.hidden,
#gameOverModal.hidden,
#soundOffIcon.hidden {
    display: none !important;
}
@media (min-width: 1024px) {
    #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; }