:root {
    /* Light Theme Colors */
    --light-bg: #ffffff;
    --light-surface: #f0f0f0;
    --light-text: #1a1a1a;
    --light-text-secondary: #666666;
    --light-accent: #2e7d32;
    --light-accent-hover: #1b5e20;

    /* Dark Theme Colors */
    --dark-bg: #1a1a1a;
    --dark-surface: #2d2d2d;
    --dark-text: #e0e0e0;
    --dark-text-secondary: #b0b0b0;
    --dark-accent: #9c27b0;
    --dark-accent-hover: #7b1fa2;

    /* Black Theme Colors */
    --black-bg: #000000;
    --black-surface: #121212;
    --black-text: #e0e0e0;
    --black-text-secondary: #b0b0b0;
    --black-accent: #9c27b0;
    --black-accent-hover: #7b1fa2;

    /* Layout Variables */
    --top-bar-height: 72px;
    --top-bar-height-mobile: 160px;

    /* Default Theme */
    --bg: var(--light-bg);
    --surface: var(--light-surface);
    --text: var(--light-text);
    --text-secondary: var(--light-text-secondary);
    --accent: var(--light-accent);
    --accent-hover: var(--light-accent-hover);
}

.theme-light {
    --bg: var(--light-bg) !important;
    --surface: var(--light-surface) !important;
    --text: var(--light-text) !important;
    --text-secondary: var(--light-text-secondary) !important;
    --accent: var(--light-accent) !important;
    --accent-hover: var(--light-accent-hover) !important;
}

.theme-dark {
    --bg: var(--dark-bg) !important;
    --surface: var(--dark-surface) !important;
    --text: var(--dark-text) !important;
    --text-secondary: var(--dark-text-secondary) !important;
    --accent: var(--dark-accent) !important;
    --accent-hover: var(--dark-accent-hover) !important;
}

.theme-black {
    --bg: var(--black-bg) !important;
    --surface: var(--black-surface) !important;
    --text: var(--black-text) !important;
    --text-secondary: var(--black-text-secondary) !important;
    --accent: var(--black-accent) !important;
    --accent-hover: var(--black-accent-hover) !important;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--top-bar-height);
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.top-bar {
    height: var(--top-bar-height);
    min-height: var(--top-bar-height);
    background-color: var(--surface);
    padding: 0.75rem 2rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
}

.top-bar-left {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.logo {
    width: 48px;
    height: 48px;
    aspect-ratio: 1;
    border-radius: 50%;
    transition: transform 0.3s ease;
    filter: drop-shadow(0 0 8px rgba(var(--accent), 0.3));
    object-fit: cover;
}

.logo:hover {
    transform: rotate(5deg) scale(1.1);
}

.main-nav .nav-link {
    color: var(--text);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    background: var(--surface);
    border: 1px solid transparent;
}

.main-nav .nav-link:hover {
    border-color: var(--accent);
    box-shadow: 0 0 20px rgba(var(--accent), 0.2);
}

.theme-selector select {
    padding: 0.5rem 2rem 0.5rem 1rem;
    border-radius: 8px;
    background-color: var(--surface);
    color: var(--text);
    border: 1px solid var(--accent);
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='currentColor' viewBox='0 0 16 16'%3E%3Cpath d='M8 11l-4-4h8l-4 4z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.7rem center;
    transition: all 0.3s ease;
}

.theme-selector select:hover {
    border-color: var(--accent-hover);
    box-shadow: 0 0 15px rgba(var(--accent), 0.2);
}

.page-header {
    min-height: calc(var(--top-bar-height) + 80px);
    margin: 72px 0 1rem;
    padding: 2rem 2rem;
    text-align: center;
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--accent);
}

.header-text {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.content-wrapper {
    max-width: 95%;
    min-width: 80%;
    margin: 1rem auto;
    padding: 0 2rem;
    flex: 1;
}

.content-section {
    background-color: var(--surface);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
    width: 100%;
}

.site-footer {
    background-color: var(--surface);
    padding: 1.5rem;
    text-align: center;
    color: var(--text-secondary);
    margin-top: auto;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.about-content {
    max-width: 800px;
    margin: 2rem auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.about-content p {
    color: var(--text);
    font-size: 1.1rem;
    line-height: 1.8;
    padding: 1.25rem;
    border-radius: 12px;
    border: 1px solid transparent;
    transition: all 0.3s ease;
}

.about-content p:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.social-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    padding: 1rem;
    flex-grow: 1;
}

.social-link {
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 1.5rem;
    background-color: var(--surface);
    padding: 1.5rem;
    border-radius: 12px;
    text-decoration: none;
    color: var(--text);
    border: 1px solid transparent;
    transition: all 0.3s ease;
    align-items: center;
}

.social-link:hover {
    border-color: var(--accent);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.social-icon {
    width: 48px;
    height: 48px;
    aspect-ratio: 1;
}

.social-text h2 {
    color: var(--accent);
    margin: 0 0 0.5rem;
}

.social-text p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

.game-body {
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
}

.game-container {
    margin: 2rem auto;
    text-align: center;
}

.game-table {
    margin: 0 auto;
    border-spacing: 8px;
}

.game-table td {
    padding: 4px;
    text-align: center;
}

.game-icon {
    height: 16px;
    width: 16px;
}

.game-instructions {
    margin-top: 2rem;
    text-align: left;
}

.game-instructions h2,
.game-instructions h3 {
    color: var(--accent);
    margin-bottom: 1rem;
}

.game-instructions h3 {
    margin: 1.5rem 0 0.5rem;
}

.game-instructions ul {
    margin: 0.5rem 0 1rem 1.5rem;
}

.game-instructions p {
    margin-bottom: 1rem;
}

.game-download-notice {
    background-color: var(--surface);
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
    display: inline-block;
}

.game-download-notice a {
    color: var(--accent);
    text-decoration: none;
}

.game-download-notice a:hover {
    text-decoration: underline;
}

.nav-link:focus-visible,
.social-link:focus-visible,
.theme-selector select:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: var(--dark-bg);
        --surface: var(--dark-surface);
        --text: var(--dark-text);
        --text-secondary: var(--dark-text-secondary);
        --accent: var(--dark-accent);
        --accent-hover: var(--dark-accent-hover);
    }
}

@media (prefers-color-scheme: dark) and (prefers-contrast: more) {
    :root {
        --bg: var(--black-bg);
        --surface: var(--black-surface);
        --text: var(--black-text);
        --text-secondary: var(--black-text-secondary);
        --accent: var(--black-accent);
        --accent-hover: var(--black-accent-hover);
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}

@media (forced-colors: active) {
    .logo,
    .nav-link,
    .theme-selector select {
        border: 1px solid currentColor;
    }
}

@media (max-width: 992px) {
    .social-container {
        flex-direction: column;
        align-items: center;
    }

    .social-image {
        width: 150px;
        margin-bottom: 1rem;
    }
}

@media (max-width: 768px) {
    .top-bar {
        height: var(--top-bar-height-mobile);
        min-height: var(--top-bar-height-mobile);
        flex-direction: column;
        padding: 0.75rem 1rem;
        gap: 1rem;
    }

    .top-bar-left {
        width: 100%;
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
    }

    .main-nav {
        display: flex;
        gap: 1rem;
        justify-content: center;
    }

    .theme-selector {
        width: 100%;
    }

    .theme-selector select {
        width: 100%;
    }

    .page-header {
        min-height: calc(var(--top-bar-height-mobile) + 120px);
        margin-top: 160px;
        padding: 2rem 1rem;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .content-wrapper {
        padding: 0 1rem;
    }

    .about-content {
        margin: 1.5rem auto;
        gap: 1rem;
    }

    .about-content p {
        font-size: 1rem;
        padding: 1rem;
    }

    .about-content p:hover {
        transform: none;
    }

    .social-grid {
        grid-template-columns: 1fr;
    }

    .social-link {
        padding: 1rem;
        gap: 1rem;
        grid-template-columns: 32px 1fr;
    }

    .social-icon {
        width: 32px;
        height: 32px;
    }
}