/* Basic Reset & Font Setup */
:root {
    --bg-color: #f4f7f9;
    --card-bg-color: #ffffff;
    --text-color: #2c3e50;
    --heading-color: #1a2533;
    --accent-color: #e67e22; /* Default orange */
    --border-color: #e0e6ed;
    --shadow-color: rgba(0, 0, 0, 0.05);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a202c;
        --card-bg-color: #2d3748;
        --text-color: #e2e8f0;
        --heading-color: #ffffff;
        --accent-color: #f0984a; /* Lighter orange for dark mode */
        --border-color: #4a5568;
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Layout */
.container {
    max-width: 1500px; /* Default, can be overridden */
    margin: 0 auto;
    padding: 20px;
    flex-grow: 1;
}

header {
    text-align: center;
    padding: 30px 20px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.2rem; /* Base size, can be overridden */
    color: var(--heading-color);
    font-weight: 300;
}

header h1 span {
    font-weight: 700;
    color: var(--accent-color);
}

main {
    padding: 20px 0;
}

.grid-container {
    display: grid;
    gap: 25px; /* Default gap, can be overridden */
    /* grid-template-columns should be defined by specific page/component needs */
}

.card {
    background-color: var(--card-bg-color);
    border-radius: 8px;
    padding: 25px; /* Default padding, can be overridden */
    box-shadow: 0 4px 6px var(--shadow-color);
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
    text-decoration: none; /* For cards used as links */
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px var(--shadow-color);
}

.card h3 {
    font-size: 1.35rem; /* Default card heading size */
    color: var(--heading-color);
    margin-bottom: 10px;
    font-weight: 600;
}

.card p {
    margin-bottom: 15px;
    flex-grow: 1;
    color: var(--text-color);
    font-size: 0.95rem; /* Default card paragraph size */
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
}

/* Styles for the Back to Home button container */
.back-to-home-container {
    padding: 10px 0;      /* Adjust vertical padding as needed */
    margin-bottom: 15px;  /* Space below the button */
    text-align: left;     /* Align button to the left */
}

/* Styles for the button itself */
.back-to-home-button {
    display: inline-block;
    padding: 8px 15px;
    background-color: var(--accent-color);
    color: var(--card-bg-color); /* Ensuring contrast with accent color */
    text-decoration: none;
    border-radius: 5px;
    font-weight: 500;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.back-to-home-button:hover {
    background-color: var(--heading-color); /* Darker color on hover */
    color: var(--card-bg-color);
}

/* Scroll-to-Top Button */
.scroll-to-top-button {
    display: none; /* Hidden by default, JS will show it */
    position: fixed;
    bottom: 20px;
    right: 30px;
    z-index: 99; /* Ensure it's on top of other content */
    border: none;
    outline: none;
    background-color: var(--accent-color);
    color: white; /* Emoji color might not be affected, but text color if emoji fails */
    cursor: pointer;
    padding: 10px 12px; /* Adjust padding for a good size */
    border-radius: 50%; /* Make it circular */
    font-size: 18px; /* Adjust emoji size */
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    transition: background-color 0.3s, opacity 0.3s;
}

.scroll-to-top-button:hover {
    background-color: var(--heading-color); /* Darken on hover */
}

.card-img {
    width: 100%;
    max-width: 60%;
    margin: 15px auto;
    display: block;
    border-radius: 5px;
    box-shadow: 0 2px 4px var(--shadow-color);
}

a {
    color: var(--accent-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}