* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    overflow: hidden;
    background: #0a0a1a;
    font-family: 'Outfit', sans-serif;
    color: #ffffff;
}

#scene-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

#ui-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    pointer-events: none;
}

#ui-overlay > * {
    pointer-events: auto;
}

.menu-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(180deg, rgba(10,10,26,0.7) 0%, rgba(10,10,26,0.95) 100%);
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideDown {
    from { transform: translateY(-20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

@keyframes spin {
    from { transform: rotateY(0deg); }
    to { transform: rotateY(360deg); }
}

.game-title {
    font-size: 4.5rem;
    font-weight: 900;
    background: linear-gradient(135deg, #f4d03f 0%, #ff6b35 50%, #f4d03f 100%);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: none;
    animation: float 3s ease-in-out infinite;
    letter-spacing: -2px;
    margin-bottom: 2rem;
}

.menu-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 320px;
}

.menu-btn {
    padding: 14px 28px;
    border: none;
    border-radius: 12px;
    font-family: 'Outfit', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
    overflow: hidden;
}

.menu-btn:hover {
    transform: translateX(8px) scale(1.02);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.menu-btn:active {
    transform: translateX(4px) scale(0.98);
}

.btn-adventure { background: linear-gradient(135deg, #2e7d32, #4caf50); color: #fff; }
.btn-infinite { background: linear-gradient(135deg, #4a148c, #7b1fa2); color: #fff; }
.btn-freeplay { background: linear-gradient(135deg, #1565c0, #42a5f5); color: #fff; }
.btn-editor { background: linear-gradient(135deg, #e65100, #ff9800); color: #fff; }
.btn-shop { background: linear-gradient(135deg, #880e4f, #e91e63); color: #fff; }
.btn-achievements { background: linear-gradient(135deg, #4e342e, #8d6e63); color: #fff; }
.btn-settings { background: linear-gradient(135deg, #37474f, #607d8b); color: #fff; }

.coin-display {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(10px);
    padding: 10px 20px;
    border-radius: 25px;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    color: #f4d03f;
    border: 1px solid rgba(244,208,63,0.3);
    font-size: 1.1rem;
}

.hud {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    pointer-events: none;
}

.hud-left, .hud-right {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.hud-item {
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(8px);
    padding: 6px 14px;
    border-radius: 8px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    font-weight: 700;
}

.world-select {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
    max-width: 900px;
}

.world-card {
    width: 260px;
    padding: 24px;
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    border: 2px solid transparent;
}

.world-card:hover {
    transform: translateY(-8px);
    border-color: rgba(255,255,255,0.3);
}

.world-card h3 {
    font-size: 1.4rem;
    margin-bottom: 8px;
}

.world-card p {
    font-size: 0.85rem;
    opacity: 0.7;
}

.world-plains { background: linear-gradient(180deg, rgba(76,175,80,0.3), rgba(139,195,74,0.1)); }
.world-ice { background: linear-gradient(180deg, rgba(33,150,243,0.3), rgba(129,212,250,0.1)); }
.world-volcano { background: linear-gradient(180deg, rgba(211,47,47,0.3), rgba(255,109,0,0.1)); }
.world-locked { opacity: 0.4; pointer-events: none; }

.level-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    max-width: 400px;
    margin: 20px auto;
}

.level-node {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid rgba(255,255,255,0.2);
}

.level-node:hover {
    transform: scale(1.15);
}

.level-node.completed {
    background: rgba(76,175,80,0.6);
    border-color: #4caf50;
}

.level-node.current {
    background: rgba(255,193,7,0.6);
    border-color: #ffc107;
    animation: pulse 1.5s infinite;
}

.level-node.locked {
    background: rgba(100,100,100,0.3);
    border-color: rgba(100,100,100,0.5);
    cursor: not-allowed;
    opacity: 0.5;
}

.pause-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.75);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s;
}

.pause-panel {
    background: linear-gradient(180deg, #1a1a2e, #16213e);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    min-width: 300px;
}

.pause-panel h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: #f4d03f;
}

.pause-btn {
    display: block;
    width: 100%;
    padding: 12px;
    margin: 8px 0;
    border: none;
    border-radius: 10px;
    font-family: 'Outfit', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    background: rgba(255,255,255,0.1);
    color: #fff;
    border: 1px solid rgba(255,255,255,0.15);
}

.pause-btn:hover {
    background: rgba(255,255,255,0.2);
    transform: scale(1.03);
}

.back-btn {
    position: absolute;
    top: 20px;
    left: 20px;
    padding: 10px 20px;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 10px;
    color: #fff;
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.back-btn:hover {
    background: rgba(255,255,255,0.15);
}

.skin-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    max-width: 600px;
    max-height: 60vh;
    overflow-y: auto;
    padding: 10px;
}

.skin-card {
    background: rgba(255,255,255,0.05);
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: 14px;
    padding: 16px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.skin-card:hover {
    border-color: rgba(244,208,63,0.5);
    transform: translateY(-4px);
}

.skin-card.equipped {
    border-color: #4caf50;
    background: rgba(76,175,80,0.1);
}

.skin-preview {
    width: 48px;
    height: 48px;
    margin: 0 auto 8px;
    border-radius: 6px;
}

.skin-name {
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.skin-price {
    font-size: 0.7rem;
    color: #f4d03f;
    font-family: 'JetBrains Mono', monospace;
}

.buy-btn {
    margin-top: 6px;
    padding: 4px 12px;
    border: none;
    border-radius: 6px;
    font-size: 0.7rem;
    font-weight: 700;
    cursor: pointer;
    background: #4caf50;
    color: #fff;
}

.buy-btn.owned {
    background: #607d8b;
    cursor: default;
}

.checkpoint-popup {
    position: absolute;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(76,175,80,0.9);
    padding: 10px 24px;
    border-radius: 8px;
    font-weight: 700;
    animation: slideDown 0.3s ease, fadeIn 0.3s ease;
}

.death-popup {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(211,47,47,0.9);
    padding: 20px 40px;
    border-radius: 12px;
    font-weight: 700;
    font-size: 1.3rem;
    text-align: center;
}

.footer-link {
    position: absolute;
    bottom: 15px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.8rem;
    opacity: 0.5;
}

.footer-link a {
    color: #f4d03f;
    text-decoration: none;
}

.footer-link a:hover {
    opacity: 1;
}

.infinite-gameover {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(180deg, #1a1a2e, #0a0a1a);
    border: 1px solid rgba(211,47,47,0.5);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    min-width: 320px;
}

.infinite-gameover h2 {
    color: #d32f2f;
    font-size: 2.2rem;
    margin-bottom: 1rem;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
}

.instructions {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    font-size: 0.8rem;
    opacity: 0.6;
    font-family: 'JetBrains Mono', monospace;
}