:root {
    --bg-color: #f0f2f5;
    --container-bg: white;
    --counter-section-bg: #f8f9fa;
    --text-color: #202124;
    --text-secondary: #5f6368;
    --primary-color: #1a73e8;
    --primary-hover: #1557b0;
    --achievement-locked-bg: #f0f2f5;
    --achievement-unlocked-bg: #e6f4ea;
    --achievement-unlocked-border: #34a853;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --filter-active-bg: #1a73e8;
    --filter-inactive-bg: #e8f0fe;
    --locked-overlay-bg: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-color: #202124;
    --container-bg: #2d2d2d;
    --counter-section-bg: #3d3d3d;
    --text-color: #ffffff;
    --text-secondary: #bdc1c6;
    --primary-color: #8ab4f8;
    --primary-hover: #aecbfa;
    --achievement-locked-bg: #3d3d3d;
    --achievement-unlocked-bg: #0f422a;
    --achievement-unlocked-border: #34a853;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --filter-active-bg: #8ab4f8;
    --filter-inactive-bg: #3d3d3d;
    --locked-overlay-bg: rgba(0, 0, 0, 0.3);
}

body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: var(--bg-color);
    transition: background-color 0.3s;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

#themeButton {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    background-color: var(--container-bg);
    box-shadow: 0 2px 5px var(--shadow-color);
    transition: transform 0.3s;
}

#themeButton:hover {
    transform: scale(1.1);
}

[data-theme="dark"] .light-icon,
[data-theme="light"] .dark-icon {
    display: none;
}

.container {
    text-align: center;
    padding: 2rem;
    background-color: var(--container-bg);
    border-radius: 10px;
    box-shadow: 0 2px 10px var(--shadow-color);
    width: 90%;
    max-width: 800px;
    transition: background-color 0.3s, box-shadow 0.3s;
    margin: 2rem 0;
}

.counter-section {
    display: flex;
    justify-content: space-around;
    margin-bottom: 2rem;
    padding: 1rem;
    background-color: var(--counter-section-bg);
    border-radius: 8px;
    transition: background-color 0.3s;
}

.individual-counter, .global-counter {
    flex: 1;
    padding: 1rem;
}

.individual-counter h2, .global-counter h2 {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin: 0 0 0.5rem 0;
}

#counter, #globalCounter {
    font-size: 3rem;
    margin: 0;
    color: var(--primary-color);
}

#clickButton {
    font-size: 1.2rem;
    padding: 1rem 2rem;
    margin: 1rem 0;
    background-color: var(--primary-color);
    color: var(--container-bg);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#clickButton:hover {
    background-color: var(--primary-hover);
}

.achievements-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin: 2rem 0;
}

.filter-btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    background-color: var(--filter-inactive-bg);
    color: var(--text-color);
    transition: all 0.3s;
}

.filter-btn:hover {
    transform: translateY(-2px);
}

.filter-btn.active {
    background-color: var(--filter-active-bg);
    color: white;
}

.achievements {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.achievement {
    padding: 1rem;
    border-radius: 10px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
    min-height: 100px;
    background-color: var(--achievement-locked-bg);
    text-align: center;
}

.achievement-content {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
}

.achievement.unlocked .achievement-content {
    opacity: 1;
    visibility: visible;
}

.achievement.unlocked {
    background-color: var(--achievement-unlocked-bg);
    border: 2px solid var(--achievement-unlocked-border);
    transform: translateY(-2px);
}

.achievement-locked-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: var(--locked-overlay-bg);
    backdrop-filter: blur(4px);
    transition: opacity 0.3s, visibility 0.3s;
}

.achievement.unlocked .achievement-locked-overlay {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.lock-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.achievement-locked-overlay p {
    margin: 0;
    color: var(--text-color);
    font-weight: bold;
}

.achievement-hint {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    font-style: italic;
}

.achievement h3 {
    margin: 0;
    color: var(--text-color);
    font-size: 1.2rem;
    text-align: center;
}

.achievement p {
    margin: 0.5rem 0 0;
    color: var(--text-secondary);
    text-align: center;
}

.achievement-description {
    display: block;
    margin-top: 0.5rem;
    font-style: italic;
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: center;
}

.special-achievement {
    grid-column: 1 / -1;
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
}

.special-achievement h3 {
    color: white;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.special-achievement p {
    color: white;
    font-size: 1.2rem;
}

.achievement[data-category] {
    display: none;
}

.achievement[data-category].show {
    display: block;
}

.special-achievement[data-category].show {
    display: block;
}

.achievement-notification {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(-100%);
    background-color: var(--container-bg);
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px var(--shadow-color);
    text-align: center;
    z-index: 1000;
    transition: transform 0.3s ease-out;
}

.achievement-notification.show {
    transform: translateX(-50%) translateY(0);
}

.achievement-notification h4 {
    margin: 0;
    color: var(--primary-color);
}

.achievement-notification p {
    margin: 0.5rem 0 0;
    color: var(--text-color);
}

.special-achievement .achievement-locked-overlay {
    background: linear-gradient(45deg, rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.5));
    backdrop-filter: blur(8px);
}

.special-achievement .lock-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.special-achievement.unlocked {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow-color);
}