:root {
    --width: 720px;
    --font-main: Verdana, sans-serif;
    --font-secondary: Verdana, sans-serif;
    --font-scale: 1em;
}

/* Light mode colors */
[data-theme="light"] {
    --background-color: #ffffff;
    --heading-color: #222;
    --text-color: #444;
    --link-color: #3273dc;
    --visited-color: #8b6fcb;
    --code-background-color: #f2f2f2;
    --code-color: #222;
    --blockquote-color: #222;
    --nav-background: #f8f9fa;
    --border-color: #dee2e6;
    --toggle-bg: #6c757d;
}

/* Dark mode colors */
[data-theme="dark"] {
    --background-color: #01242e;
    --heading-color: #f2f2f2;
    --text-color: #e9ecef;
    --link-color: #66b3ff;
    --visited-color: #b19cd9;
    --code-background-color: #2d3748;
    --code-color: #f2f2f2;
    --blockquote-color: #f2f2f2;
    --nav-background: #1a202c;
    --border-color: #4a5568;
    --toggle-bg: #4299e1;
}

* {
    box-sizing: border-box;
}

body {
    max-width: var(--width);
    margin: 0 auto;
    padding: 15px;
    background-color: var(--background-color);
    font-family: var(--font-main);
    line-height: 1.6;
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Header styles */
header {
    margin-bottom: 2rem;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.title {
    color: var(--heading-color);
    margin: 0;
    font-size: 1.8rem;
    flex-grow: 1;
}

.title a {
    color: inherit;
    text-decoration: none;
}

/* Theme toggle button */
.theme-toggle {
    background: var(--toggle-bg);
    border: none;
    border-radius: 50px;
    width: 60px;
    height: 30px;
    position: relative;
    cursor: pointer;
    transition: background-color 0.3s ease;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle::before {
    content: '🌙';
    position: absolute;
    left: 5px;
    font-size: 16px;
    transition: transform 0.3s ease;
}

[data-theme="light"] .theme-toggle::before {
    content: '☀️';
    transform: translateX(25px);
}

.theme-toggle:hover {
    opacity: 0.8;
}

/* Burger menu styles */
.burger-menu {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 8px;
    border: none;
    background: transparent;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.burger-menu:hover {
    background-color: var(--code-background-color);
}

.burger-line {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 2px 0;
    transition: 0.3s;
    border-radius: 2px;
}

.burger-menu.active .burger-line:nth-child(1) {
    transform: rotate(-45deg) translate(-6px, 6px);
}

.burger-menu.active .burger-line:nth-child(2) {
    opacity: 0;
}

.burger-menu.active .burger-line:nth-child(3) {
    transform: rotate(45deg) translate(-6px, -6px);
}

/* Navigation styles */
nav {
    /*background: var(--nav-background);*/
    padding: 1rem;
    /*border-radius: 8px;*/
    /*border: 1px solid var(--border-color);*/
    overflow-x: auto;
    transition: max-height 0.3s ease, opacity 0.3s ease;
}

.nav-menu {
    transition: all 0.3s ease;
}

nav p {
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    min-width: max-content;
}

nav a {
    color: var(--link-color);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s ease;
    white-space: nowrap;
}

nav a:hover {
    background-color: var(--code-background-color);
}

nav a:visited {
    color: var(--visited-color);
}

/* Main content */
main {
    margin-bottom: 3rem;
}

main h1 {
    color: var(--heading-color);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

main p {
    margin-bottom: 1rem;
    color: var(--text-color);
}

a {
    color: var(--link-color);
    text-decoration: underline;
}

a:visited {
    color: var(--visited-color);
}

a:hover {
    text-decoration: none;
}

/* Footer */
footer {
    margin-top: 40px;
    color: var(--text-color);
    text-align: center;
    padding: 1rem;
    border-top: 1px solid var(--border-color);
}

footer p {
    margin: 0.5rem 0;
}

/* Mobile-specific styles */
@media (max-width: 768px) {
    body {
        padding: 10px;
        font-size: 0.9rem;
    }

    .title {
        font-size: 1.5rem;
    }

    .header-top {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }

    .header-controls {
        gap: 0.5rem;
    }

    .burger-menu {
        display: flex;
    }

    nav {
        max-height: 0;
        opacity: 0;
        overflow: hidden;
        /*padding: 0 0.8rem;*/
        margin-top: 1rem;
        border: none;
        background: transparent;
        transition: max-height 0.3s ease, opacity 0.3s ease, padding 0.3s ease;
    }

    nav.active {
        max-height: 300px;
        opacity: 1;
        padding: 0.8rem;
        /*background: var(--nav-background);*/
        /*border: 1px solid var(--border-color);*/
        /*border-radius: 8px;*/
    }

    nav p {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
        margin: 0;
    }

    nav a {
        /*padding: 0.8rem;*/
        font-size: 0.9rem;
        text-align: center;
        border-radius: 4px;
        border: 1px solid var(--border-color);
        background: var(--background-color);
        transition: all 0.3s ease;
    }

    nav a:hover {
        background-color: var(--code-background-color);
        transform: translateY(-1px);
    }

    main h1 {
        font-size: 1.3rem;
    }
}

@media (max-width: 480px) {
    body {
        padding: 8px;
    }

    .title {
        font-size: 1.3rem;
    }

    .header-controls {
        gap: 0.3rem;
    }

    .theme-toggle {
        width: 50px;
        height: 25px;
    }

    .theme-toggle::before {
        font-size: 14px;
    }

    [data-theme="light"] .theme-toggle::before {
        transform: translateX(20px);
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --link-color: #0066cc;
        --visited-color: #663399;
    }
}

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