:root {
    --color-background: #f5f5f5;
    --color-text: #2f2f2f;
    --color-shadow: rgba(0, 0, 0, 0.1);
    --transition-speed: 0.3s;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

nav {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    padding: 1rem;
    z-index: 100;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    width: 100%;
    box-sizing: border-box;
    flex-wrap: wrap;
    gap: 1rem;
    position: relative;
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 1rem;
    opacity: 0; /* Changed from 1 to make it invisible */
    visibility: hidden; /* Added to hide it completely from view */
    position: absolute; /* Position it out of the flow */
    pointer-events: none; /* Prevent user interaction with it */
}

.volume-label {
    color: var(--color-text);
    font-size: 0.9rem;
    opacity: 0.7;
}

input[type="range"] {
    width: 100px;
    height: 4px;
    appearance: none;
    -webkit-appearance: none;
    background: var(--color-text);
    opacity: 0.7;
    border-radius: 2px;
    transition: opacity var(--transition-speed);
}

input[type="range"]:hover {
    opacity: 1;
}

.logo:active {
    transform: scale(0.98);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    background: var(--color-text);
    border-radius: 50%;
    cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
    width: 12px;
    height: 12px;
    background: var(--color-text);
    border: none;
    border-radius: 50%;
    cursor: pointer;
}

.nav-button {
    background: none;
    border: none;
    color: var(--color-text);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity var(--transition-speed);
    margin: 0 1rem;
}

.nav-button:hover {
    opacity: 1;
}

.sound-toggle {
    display: block;
    margin: 2rem auto 0;
    background: rgba(47, 47, 47, 0.9);
    border: none;
    color: white;
    font-size: 1.8rem;
    padding: 0.3rem 0.8rem;
    border-radius: 12px;
    cursor: pointer;
    opacity: 0.9;
    transition: all var(--transition-speed);
    visibility: visible;
}

.sound-toggle:hover {
    opacity: 1;
}

.sound-toggle {
    font-size: 1.2rem;
    padding: 0.2rem 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sound-on, .sound-off {
    transition: opacity var(--transition-speed);
}

.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* Exception for modal which needs display:none */
.modal.hidden {
    display: none;
}

main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.container {
    max-width: 800px;
    width: 100%;
    text-align: center;
}

.coin {
    position: absolute;
    width: 30px;
    height: 30px;
    background: url('coin.png') no-repeat center/contain;
    pointer-events: none;
    z-index: 1000;
    display: none;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.coin.active {
    display: block;
    animation: jumpAndFade 0.5s ease-out forwards;
}

@keyframes jumpAndFade {
    0% {
        transform: translate(-50%, -50%);
        opacity: 1;
    }
    50% {
        transform: translate(-50%, -800%);
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -700%);
        opacity: 0;
    }
}

.logo-container {
    width: 100%;
    max-width: 500px;
    margin: 0 auto 0.5rem; /* Reduced bottom margin from 1rem to 0.5rem */
    position: relative;
    padding-bottom: 1.5rem; /* Reduced padding-bottom from 3rem to 1.5rem */
    margin-top: 1rem;
}

.coin-counter {
    position: absolute;
    top: 0;
    left: 15%; /* Moved from left edge (0) to 15% toward center */
    transform: translate(0, 0);
    background: rgba(128, 128, 128, 0.9);
    color: white;
    padding: 0.3rem 0.8rem; /* Match level-display padding */
    border-radius: 10px; /* Match level-display border-radius */
    font-size: 1.1rem; /* Match level-display font-size */
    transition: opacity 0.3s ease;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.max-level-message {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(47, 47, 47, 0.9);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 12px;
    font-size: 1.2rem;
    transition: opacity 0.5s ease;
    z-index: 11;
    white-space: nowrap;
    width: 90%;
}

.max-level-message.hidden {
    opacity: 0;
    pointer-events: none;
}

.level-display {
    position: absolute;
    top: 0;
    right: 15%; /* Moved from right edge (0) to 15% toward center */
    transform: translate(0, 0);
    background: rgba(47, 47, 47, 0.9);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 10px;
    font-size: 1.1rem;
    transition: opacity 0.3s ease;
    z-index: 10;
}

.level-display.hidden {
    opacity: 0;
    pointer-events: none;
}

.counter-coin {
    width: 20px;
    height: 20px;
    background: url('coin.png') no-repeat center/contain;
}

.coin-counter.hidden {
    opacity: 0;
    pointer-events: none;
}

.logo {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
    cursor: pointer;
    box-shadow: 0 8px 24px var(--color-shadow);
    transition: all var(--transition-speed);
    transform-origin: center;
}

.logo:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 32px var(--color-shadow);
}

.logo:active {
    transform: translateY(-2px) scale(0.95);
    box-shadow: 0 4px 8px var(--color-shadow);
}

h1 {
    font-weight: 300;
    font-size: 2rem;
    margin-top: 0; /* Added to remove any top margin */
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

p {
    font-weight: 300;
    color: rgba(47, 47, 47, 0.8);
}

.copyright {
    margin-top: 1rem;
    font-size: 0.8rem;
    color: rgba(47, 47, 47, 0.6);
    text-align: center;
}

@media (max-width: 480px) {
    .copyright {
        margin-top: 0.75rem;
        font-size: 0.7rem;
    }
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(4px);
    z-index: 1000;
    opacity: 0;
    transition: opacity var(--transition-speed);
}

.modal.show {
    display: flex;
    opacity: 1;
}

.modal-content {
    background-color: white;
    margin: auto;
    padding: 3rem;
    width: 90%;
    max-width: 600px;
    border-radius: 12px;
    position: relative;
    transform: translateY(20px);
    transition: transform var(--transition-speed);
}

.modal.show .modal-content {
    transform: translateY(0);
}

.close-button {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity var(--transition-speed);
}

.close-button:hover {
    opacity: 1;
}

h2, h3 {
    margin-bottom: 1rem;
    font-weight: 400;
}

h3 {
    margin-top: 2rem;
}

@media (max-width: 768px) {
    h1 {
        font-size: 1.5rem;
    }

    .modal-content {
        padding: 2rem;
    }

    .logo-container {
        max-width: 400px;
    }

    nav {
        padding: 0.75rem;
    }

    .nav-button {
        font-size: 0.8rem;
    }

    .volume-label {
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 1rem;
    }
    
    .logo-container {
        margin-bottom: 1rem;
        max-width: 300px;
        padding-bottom: 2.5rem;
    }

    nav {
        padding: 0.5rem;
        justify-content: space-between;
        padding-top: 60px;
    }

    .volume-control {
        width: auto;
        justify-content: flex-start;
        margin: 0.75rem 0;
    }

    .nav-button {
        width: auto;
        text-align: right;
        padding: 0.5rem 0.75rem;
        font-size: 0.7rem;
    }

    .max-level-message {
        top: 40px;
        font-size: 0.85rem;
        padding: 0.4rem 0.8rem;
    }
    .coin-counter {
        top: 0;
        left: 10%; /* Adjusted for smaller screens */
        transform: translate(0, 0);
        font-size: 0.9rem; /* Match level-display font size in this media query */
        padding: 0.3rem 0.6rem; /* Match level-display padding */
        background: rgba(47, 47, 47, 0.9); /* Match level-display background */
    }

    .level-display {
        top: 0;
        right: 10%; /* Adjusted for smaller screens */
        transform: translate(0, 0);
        font-size: 0.9rem;
        padding: 0.3rem 0.6rem;
    }

    h1 {
        font-size: 1.25rem;
    }

    p {
        font-size: 0.9rem;
    }

    main {
        padding: 1rem;
        padding-top: 4rem;
    }

    .sound-toggle {
        margin: 0.75rem auto 0.75rem;
    }
}

@media (max-width: 360px) {
    .nav-button {
        font-size: 0.65rem;
        padding: 0.5rem 0.6rem;
    }

    .max-level-message {
        font-size: 0.75rem;
        padding: 0.3rem 0.6rem;
    }
    .coin-counter {
        top: 0;
        left: 5%; /* Adjusted for very small screens */
        transform: translate(0, 0);
        font-size: 0.8rem; /* Match level-display font size */
        padding: 0.2rem 0.5rem; /* Match level-display padding */
        background: rgba(47, 47, 47, 0.9); /* Match level-display background */
    }

    .level-display {
        top: 0;
        right: 5%; /* Adjusted for very small screens */
        transform: translate(0, 0);
        font-size: 0.8rem;
        padding: 0.2rem 0.5rem;
    }
}

/* Center the About & Contact button */
#aboutContactBtn {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    margin: 0;
}

/* Level up particles */
.particles-container {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    right: 0;
    overflow: hidden;
    pointer-events: none;
}

.particle {
    position: absolute;
    background-color: #ffcc00;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    animation: particle-animation 1s ease-out forwards;
    opacity: 0.8;
}

@keyframes particle-animation {
    0% {
        transform: translate(0, 0) scale(1);
        opacity: 0.8;
    }
    100% {
        transform: translate(var(--tx), var(--ty)) scale(0);
        opacity: 0;
    }
}

/* Star particle variant */
.particle.star {
    clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
    background-color: gold;
}

/* Circle particle variant */
.particle.circle {
    border-radius: 50%;
}

/* Square particle variant */
.particle.square {
    border-radius: 0;
}

/* Different colors for particles */
.particle.color1 { background-color: #ffcc00; }
.particle.color2 { background-color: #ff3366; }
.particle.color3 { background-color: #33ccff; }
.particle.color4 { background-color: #33ff66; }
.particle.color5 { background-color: #cc66ff; }

/* Pulsating effect for level display when leveling up */
@keyframes levelPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.level-pulsate {
    animation: levelPulse 0.5s ease-in-out;
}