/* Minimal reset for common elements */
html, body, h1, p, ul, li, button, header, nav, main, footer, a {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Screen-reader-only class for accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* CSS Variables for Light and Dark Modes */
:root {
    --bg-color: #f4f4f4;
    --text-color: #333;
    --header-footer-bg: #13692d;
    --button-bg: #13692d;
    --button-hover: #0f4d20;
    --hamburger-color: #FAFAFA;
    --hamburger-hover: #e3e3e3;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a2b1e;
        --text-color: #e0e0e0;
        --header-footer-bg: #0f4d20;
        --button-bg: #0f4d20;
        --button-hover: #13692d;
        --hamburger-color: #e3e3e3;
        --hamburger-hover: #FAFAFA;
    }
}

.dark-mode {
    --bg-color: #1a2b1e;
    --text-color: #e0e0e0;
    --header-footer-bg: #0f4d20;
    --button-bg: #0f4d20;
    --button-hover: #13692d;
    --hamburger-color: #e3e3e3;
    --hamburger-hover: #FAFAFA;
}

/* Body styles */
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation bar */
header {
    background-color: var(--header-footer-bg);
    padding: 1.5rem;
    position: relative;
    min-height: 3rem;
}

nav {
    position: relative;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.hamburger {
    display: none;
    background: none;
    border: none;
    color: var(--hamburger-color);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    margin-left: auto;
}

.hamburger:hover,
.hamburger:focus {
    color: var(--hamburger-hover);
}

.hamburger-icon {
    display: inline-block;
}

.nav-menu {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

.nav-menu li {
    margin: 0.5rem 1rem;
}

.nav-menu li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    font-size: 1rem;
    font-size: clamp(1rem, 2.5vw, 1.1rem);
    padding: 0.5rem;
    display: inline-block;
}

.nav-menu li a:hover,
.nav-menu li a:focus {
    color: #ddd;
}

.dark-mode-toggle {
    background: none;
    border: none;
    color: var(--hamburger-color);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    margin-left: 1rem;
}

.dark-mode-toggle:hover,
.dark-mode-toggle:focus {
    color: var(--hamburger-hover);
}

.toggle-icon {
    display: inline-block;
}

/* Main content */
main {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1rem;
    text-align: center;
    flex: 1;
    margin-top: 1rem;
}

h1 {
    margin-bottom: 1rem;
    color: var(--text-color);
    font-size: 1.5rem;
    font-size: clamp(1.5rem, 5vw, 2rem);
}

p {
    margin-bottom: 1rem;
    color: var(--text-color);
    font-size: 0.9rem;
    font-size: clamp(0.9rem, 2.5vw, 1rem);
}

button {
    padding: 0.75rem 1.5rem;
    background-color: var(--button-bg);
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-size: clamp(1rem, 2.5vw, 1.1rem);
    border-radius: 5px;
    min-width: 120px;
}

button:hover,
button:focus {
    background-color: var(--button-hover);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

/* Footer */
footer {
    background-color: var(--header-footer-bg);
    color: #fff;
    text-align: center;
    padding: 1rem;
    width: 100%;
}

/* Mobile-specific styles */
@media (max-width: 600px) {
    header {
        padding: 0.5rem 1rem;
        min-height: 2.5rem;
    }

    nav {
        justify-content: flex-start;
        flex-direction: column;
        align-items: flex-start;
    }

    .hamburger {
        display: block;
        position: absolute;
        top: 0.25rem;
        left: 0.5rem;
        padding: 0.25rem;
        z-index: 1000;
        margin: 0;
    }

    .dark-mode-toggle {
        display: block;
        position: absolute;
        top: 0.25rem;
        right: 0.5rem;
        padding: 0.25rem;
        margin: 0;
    }

    .nav-menu {
        display: none;
        flex-direction: column;
        align-items: center;
        width: 100%;
        background-color: var(--header-footer-bg);
        position: absolute;
        top: 0rem;
        left: 0;
        padding: 1rem;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
        z-index: 999;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        margin: 0.5rem 0;
        width: 100%;
    }

    .nav-menu li a {
        font-size: 1.1rem;
        font-size: clamp(1.1rem, 3vw, 1.2rem);
        padding: 0.75rem;
        display: block;
        text-align: center;
    }

    main {
        margin: 0 auto;
        padding: 0 0.5rem;
        margin-top: 0.5rem;
    }

    h1 {
        font-size: 1.2rem;
        font-size: clamp(1.2rem, 4vw, 1.5rem);
    }

    p {
        font-size: 0.8rem;
        font-size: clamp(0.8rem, 2.5vw, 0.9rem);
    }

    button {
        padding: 0.75rem 1.25rem;
        font-size: 0.9rem;
        font-size: clamp(0.9rem, 2.5vw, 1rem);
    }

    footer {
        position: static;
        padding: 0.75rem;
    }
}

/* Ensure touch targets are large enough */
a, button {
    touch-action: manipulation;
}