:root {
    --bg-color: #ffffff; /* Colors.white */
    --text-color: #000000; /* Colors.black */
    --font-family: 'Arial', sans-serif;
    --link-color: #2196F3; /* Colors.blue */
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #000000; /* Colors.black */
        --text-color: #ffffff; /* Colors.white */
    }
}

html {
    display: flex;
    justify-content: center; /* Horizontal centering */
    background-color: var(--bg-color); /* Match body color to avoid white edges */
}

/* --- Base Body Style --- */
body {
    width: 100%;
    max-width: 900px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    padding: 8px;
    margin: 0;
    font-size: 14px; /* Base font size */
    transition: background-color 0.3s, color 0.3s;
}

h1 {
    font-size: 24px;
    color: var(--text-color);
    margin-top: 0.67em;
    margin-bottom: 0.67em;
}

h2 {
    font-size: 20px;
    margin-top: 20px;
    color: var(--text-color);
}

h3 {
    font-size: 16px;
    margin-top: 12px;
    color: var(--text-color);
}

p {
    font-size: 14px;
    margin-top: 10px;
    color: var(--text-color);
}

li {
    font-size: 14px;
    color: var(--text-color);
}

img {
    display: block;
    height: auto;
    margin-top: 2px;
    margin-bottom: 2px;
}

.small-icon { width: 24px; display: block; }
.medium-icon { width: 48px; display: block; }
.large-icon { width: 96px; display: block; }

.new-p { margin-top: 24px; }
.no-margin-top { margin-top: 0px !important; }

.left-padding { margin-left: 30px; }
.left-padding-2 { margin-left: 60px; }
.left-padding-back { margin-left: -24px; }
.left-top-padding { margin-left: 15px; margin-top: 15px; }

.flutter-link { color: var(--link-color); font-weight: bold; text-decoration: none; }
.flutter-email { color: var(--link-color); text-decoration: underline; }

.container { max-width: 800px; margin: 0 auto; padding: 20px; }
.card {
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 15px;
}

/* --- 404 --- */
.error-card {
    text-align: center;
    padding: 50px 20px;
    max-width: 500px;
    margin: 10vh auto;
    border: 1px solid var(--border-color);
    border-radius: 12px;
}
.error-404-title { font-size: 80px; margin: 0; color: var(--border-color); }
.btn-home {
    display: inline-block;
    background-color: var(--link-color);
    color: var(--bg-color) !important;
    padding: 12px 24px;
    border-radius: 6px;
    text-decoration: none;
    margin-top: 20px;
}