:root {
    --primary-color: #2997ff;
    --bg-color: #000000;
    --text-color: #f5f5f7;
    --secondary-text: #86868b;
    
    --glass-bg: rgba(30, 30, 35, 0.65);
    --glass-border: rgba(255, 255, 255, 0.12);
    --glass-highlight: rgba(255, 255, 255, 0.08);
    --glass-blur: blur(25px);
}

body {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    background: var(--bg-color);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
    color: var(--text-color);
}

#game-wrapper {
    width: 100vw;
    height: 100vh;
}

#game-container {
    position: relative;
    width: 100%;
    height: 100%;
    background-color: #111;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
}

#ui-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

#score {
    position: absolute;
    top: 10%;
    width: 100%;
    text-align: center;
    font-size: 6rem;
    font-family: 'Fredoka One', cursive;
    color: white;
    text-shadow: 0 4px 12px rgba(0,0,0,0.5);
    z-index: 20;
}

#fps-overlay {
    position: absolute;
    top: 20px;
    left: 20px;
    padding: 6px 10px;
    border-radius: 10px;
    font-size: 0.9rem;
    font-family: 'Fredoka One', cursive;
    color: #fff;
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.12);
    z-index: 35;
}

#mute-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    z-index: 30;
    pointer-events: auto;
    color: #fff;
    transition: transform 0.2s, background 0.2s;
    box-shadow: none;
}

#mute-btn svg {
    width: 28px;
    height: 28px;
}

#mute-btn:hover {
    background: rgba(45, 45, 50, 0.8);
    transform: scale(1.05);
}

#mute-btn:active {
    transform: scale(0.95);
}

.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: rgba(0, 0, 0, 0.3);
    pointer-events: auto;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    cursor: pointer;
}

.screen.active {
    display: flex;
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(1.05); }
    to { opacity: 1; transform: scale(1); }
}

@keyframes pulseText {
    0% { opacity: 0.8; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.05); }
    100% { opacity: 0.8; transform: scale(1); }
}

.logo {
    font-family: 'Fredoka One', cursive;
    font-size: 5.5rem !important;
    line-height: 0.85;
    color: #fff;
    text-shadow: 0 10px 30px rgba(0,0,0,0.5);
    margin-bottom: 50px;
    text-align: center;
    animation: float 3s ease-in-out infinite;
}

.logo span {
    color: var(--primary-color);
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}
.mode-selector {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    background: var(--glass-bg);
    padding: 5px;
    border-radius: 50px;
    border: 1px solid var(--glass-border);
}

.mode-btn {
    background: transparent;
    border: none;
    padding: 10px 25px;
    font-size: 1rem;
    font-weight: 800;
    color: var(--secondary-text);
    border-radius: 40px;
    transition: all 0.2s;
}

.mode-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 15px rgba(41, 151, 255, 0.3);
}

#endless-controls {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#levels-view {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

.world-selector {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.world-btn {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.2);
    color: rgba(255,255,255,0.6);
    padding: 8px 20px;
    font-size: 0.9rem;
    font-weight: 700;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.2s;
}

.world-btn.active {
    background: var(--primary-color);
    color: #fff;
    border-color: transparent;
}

.world-btn.locked {
    opacity: 0.5;
    cursor: not-allowed;
    border-style: dashed;
}

#level-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 15px;
    width: 350px;
    max-width: 90vw;
}

.level-btn {
    aspect-ratio: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-family: 'Fredoka One', cursive;
    padding: 0;
    border-radius: 15px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    cursor: pointer;
    transition: all 0.2s;
    color: #fff;
}

.level-btn:hover:not(.locked) {
    background: var(--primary-color);
    border-color: transparent;
    transform: translateY(-2px);
}

.level-btn.locked {
    opacity: 0.3;
    cursor: not-allowed;
    background: rgba(0,0,0,0.3);
    color: rgba(255,255,255,0.3);
}

.instruction-box {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    padding: 20px 0;
    width: 420px;
    max-width: 90vw;
    box-sizing: border-box;
    text-align: center;
    border-radius: 100px;
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.difficulty-selector {
    margin-top: 30px;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 25px;
    padding: 10px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    pointer-events: auto;
    width: 100%;
    max-width: 380px;
}

.powerups-row {
    width: 100%;
    max-width: 380px;
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    pointer-events: auto;
    margin: 14px 0;
}

.game-over-container .powerups-row {
    max-width: 100%;
    margin: 0 0 12px 0;
}

.diff-btn {
    background: transparent;
    border: none;
    color: rgba(255, 255, 255, 0.6);
    padding: 8px 16px;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    border-radius: 50px;
    transition: all 0.2s;
    box-shadow: none;
    flex: 1 1 auto;
}

.diff-btn:hover {
    color: #fff;
    transform: none;
    filter: none;
    background: rgba(255,255,255,0.1);
}

.diff-btn.active {
    background: var(--primary-color);
    color: #fff;
    box-shadow: none;
}

.instruction-box p {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--text-color);
    animation: pulseText 2s infinite ease-in-out;
}

.game-over-container {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    padding: 40px;
    width: 420px;
    max-width: 90vw;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.game-over-container .logo {
    margin-bottom: 30px;
    font-size: 4.5rem !important;
}

.game-over-container .score-card {
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border: none;
    box-shadow: none;
    margin-bottom: 20px;
    padding: 0;
    width: 100%;
}

.game-over-container .difficulty-selector {
    background: rgba(255, 255, 255, 0.05);
    border: none;
    margin-top: 0;
    margin-bottom: 30px !important;
}

.game-over-container .instruction-box {
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border: none;
    box-shadow: none;
    padding: 0;
    width: 100%;
}

.score-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 32px;
    padding: 30px 0;
    width: 420px;
    max-width: 90vw;
    box-sizing: border-box;
    display: flex;
    justify-content: space-around;
    align-items: center;
    margin-bottom: 30px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.score-info {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.score-card p {
    color: var(--secondary-text);
    margin: 0;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.score-card span {
    display: block;
    font-size: 3rem;
    font-family: 'Fredoka One', cursive;
    color: #fff;
    margin: 5px 0 0 0;
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 30px;
    letter-spacing: -1px;
}

button {
    background: var(--primary-color);
    border: 1px solid rgba(255,255,255,0.1);
    color: white;
    font-weight: 600;
    font-size: 1.1rem;
    padding: 16px 40px;
    border-radius: 100px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: none;
}

button:hover {
    transform: translateY(-2px);
    filter: brightness(1.1);
    box-shadow: none;
}

button:active {
    transform: translateY(0);
    filter: brightness(0.9);
}

#restart-btn {
    font-family: -apple-system, BlinkMacSystemFont, sans-serif;
}

#version-tag {
    position: absolute;
    bottom: 15px;
    right: 20px;
    color: var(--secondary-text);
    font-size: 0.75rem;
    font-weight: 600;
    opacity: 0.5;
    pointer-events: none;
    z-index: 25;
}

.game-over-buttons {
    display: flex;
    gap: 15px;
    width: 100%;
    justify-content: center;
    margin-top: 10px;
}

.action-btn {
    flex: 1;
    padding: 15px 0;
    font-size: 1.2rem;
    font-weight: 800;
    text-transform: uppercase;
}

.action-btn:hover {
    transform: none;
    filter: none;
}

#go-home-btn {
    background: var(--primary-color);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

#go-restart-btn {
    background: var(--primary-color);
}

@media (max-width: 600px) {
    .score-card { width: 90vw; padding: 30px 0; }
}