/* General Styles */
body {
    font-family: 'Roboto', sans-serif; /* Example modern font */
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Dark Mode Overrides (Bootstrap 5 handles most via data-bs-theme) */
[data-bs-theme="dark"] {
    --bs-body-bg: #1a1a1a; /* Darker background */
    --bs-body-color: #f0f0f0;
    --bs-emphasis-color: #f8f9fa;
    --bs-secondary-bg: #2a2a2a; /* Darker secondary background for cards etc. */
    --bs-tertiary-bg: #3a3a3a;
    --bs-border-color: #444;
}

[data-bs-theme="dark"] .navbar {
    background-color: #222 !important; /* Ensure navbar stays dark */
}

[data-bs-theme="dark"] .card {
    background-color: var(--bs-secondary-bg);
    border-color: var(--bs-border-color);
}
[data-bs-theme="dark"] .list-group-item {
    background-color: var(--bs-secondary-bg);
    border-color: var(--bs-border-color);
}


/* Hero Section */
#hero {
    background: url('../assets/images/hero-bg.jpg') no-repeat center center/cover; /* Replace with your image */
    color: white; /* Default for light image, might need adjustment for dark image */
    padding: 8rem 0;
    position: relative;
}
#hero::before { /* Overlay for better text readability */
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5); /* Adjust opacity as needed */
}
#hero .container {
    position: relative; /* To keep content above overlay */
    z-index: 1;
}
[data-bs-theme="dark"] #hero::before {
    background-color: rgba(0, 0, 0, 0.7); /* Darker overlay for dark mode */
}


/* Feature Cards */
.feature-card img {
    height: 200px;
    object-fit: cover;
}

/* Chat Interface */
#chat-interface {
    max-width: 800px;
    margin: auto;
}
#chat-messages {
    height: 400px;
    overflow-y: auto;
    border: 1px solid var(--bs-border-color);
    padding: 1rem;
    background-color: var(--bs-tertiary-bg-rgb); /* Slightly different from card bg */
}
[data-bs-theme="light"] #chat-messages {
    background-color: #f8f9fa; /* Light theme chat background */
}

.chat-message {
    max-width: 75%;
    word-wrap: break-word;
}
.user-message {
    background-color: var(--bs-primary);
    color: white;
    margin-left: auto;
    border-radius: 15px 15px 0 15px !important;
    text-align: right;
}
.ai-message {
    background-color: var(--bs-secondary); /* Bootstrap secondary or custom */
    color: var(--bs-body-color); /* Ensure text is readable */
    margin-right: auto;
    border-radius: 15px 15px 15px 0 !important;
}
.user-action { /* For "User requested revision" etc. */
    font-style: italic;
    color: var(--bs-gray-600);
    text-align: center;
    font-size: 0.9em;
    background-color: transparent !important; /* Override other message styles */
}

[data-bs-theme="dark"] .user-message {
    background-color: var(--bs-primary); /* Keep primary for user messages */
}
[data-bs-theme="dark"] .ai-message {
    background-color: #444; /* Darker AI message bubble */
    color: #f0f0f0;
}


/* Gallery */
.gallery-item img {
    width: 100%;
    height: 300px; /* Or use aspect-ratio */
    object-fit: cover;
    transition: transform 0.3s ease;
}
.gallery-item img:hover {
    transform: scale(1.05);
}

/* Footer */
footer {
    padding: 2rem 0;
    background-color: var(--bs-secondary-bg-subtle); /* Subtle background for footer */
}
[data-bs-theme="dark"] footer {
     background-color: #111; /* Even darker footer for dark mode */
}

/* Utility */
.section-padding {
    padding: 4rem 0;
}
.section-heading {
    margin-bottom: 3rem;
    font-weight: 700;
}