/* Global Styles & Variables */
:root {
    --primary-color: #6f42c1; /* Example: Bootstrap purple */
    --secondary-color: #fd7e14; /* Example: Bootstrap orange */
    --light-bg: #f8f9fa;
    --light-text: #212529;
    --dark-bg: #212529;
    --dark-text: #f8f9fa;
    --card-bg-light: #fff;
    --card-bg-dark: #343a40;
    --border-color-light: rgba(0,0,0,.125);
    --border-color-dark: rgba(255,255,255,.125);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Light Mode (Default) */
body {
    background-color: var(--light-bg);
    color: var(--light-text);
}

.navbar {
    background-color: var(--card-bg-light);
    border-bottom: 1px solid var(--border-color-light);
}

.card {
    background-color: var(--card-bg-light);
    border: 1px solid var(--border-color-light);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}
.btn-primary:hover {
    background-color: darken(var(--primary-color), 10%);
    border-color: darken(var(--primary-color), 10%);
}
.btn-secondary {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}
.btn-secondary:hover {
    background-color: darken(var(--secondary-color), 10%);
    border-color: darken(var(--secondary-color), 10%);
}

.form-control {
    background-color: var(--card-bg-light);
    color: var(--light-text);
    border: 1px solid var(--border-color-light);
}
.form-control:focus {
    background-color: var(--card-bg-light);
    color: var(--light-text);
}

/* Dark Mode */
[data-bs-theme="dark"] body {
    background-color: var(--dark-bg);
    color: var(--dark-text);
}

[data-bs-theme="dark"] .navbar {
    background-color: var(--card-bg-dark);
    border-bottom: 1px solid var(--border-color-dark);
}
[data-bs-theme="dark"] .navbar-brand,
[data-bs-theme="dark"] .nav-link {
    color: var(--dark-text) !important;
}
[data-bs-theme="dark"] .nav-link:hover {
    color: var(--secondary-color) !important;
}

[data-bs-theme="dark"] .card {
    background-color: var(--card-bg-dark);
    border: 1px solid var(--border-color-dark);
    color: var(--dark-text);
}
[data-bs-theme="dark"] .card h5, [data-bs-theme="dark"] .card p {
    color: var(--dark-text);
}

[data-bs-theme="dark"] .form-control {
    background-color: #495057; /* Slightly lighter than card bg for contrast */
    color: var(--dark-text);
    border: 1px solid var(--border-color-dark);
}
[data-bs-theme="dark"] .form-control::placeholder {
    color: #adb5bd;
}
[data-bs-theme="dark"] .form-control:focus {
    background-color: #495057;
    color: var(--dark-text);
}

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

/* Section Specific Styles */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 100px 0;
    text-align: center;
}
[data-bs-theme="dark"] .hero-section {
     background: linear-gradient(135deg, #4a2c82 0%, #a5520c 100%); /* Darker gradient */
}
.hero-section h1 {
    font-size: 3.5rem;
    font-weight: bold;
}
.hero-section p {
    font-size: 1.25rem;
}

.feature-card img {
    height: 200px;
    object-fit: cover;
}

.marketing-content p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

/* Chat Interface */
#chat-container {
    max-width: 800px;
    margin: auto;
}
#chat-messages {
    height: 400px;
    overflow-y: auto;
    border: 1px solid var(--border-color-light);
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 0.25rem;
}
[data-bs-theme="dark"] #chat-messages {
    border: 1px solid var(--border-color-dark);
}
.chat-message {
    padding: 8px 12px;
    margin-bottom: 10px;
    border-radius: 15px;
    max-width: 70%;
    word-wrap: break-word;
}
.user-message {
    background-color: var(--primary-color);
    color: white;
    margin-left: auto;
    border-bottom-right-radius: 0;
}
.ai-message {
    background-color: #e9ecef;
    color: var(--light-text);
    margin-right: auto;
    border-bottom-left-radius: 0;
}
[data-bs-theme="dark"] .ai-message {
    background-color: #495057;
    color: var(--dark-text);
}
.ai-message img {
    max-width: 100%;
    height: auto;
    margin-top: 10px;
    border-radius: 5px;
}
#chat-input-group .btn {
    margin-left: 5px;
}

/* Gallery */
.gallery-item img {
    width: 100%;
    height: 300px; /* Adjust as needed */
    object-fit: cover;
    border-radius: 0.25rem;
    transition: transform 0.3s ease;
}
.gallery-item img:hover {
    transform: scale(1.05);
}

footer {
    border-top: 1px solid var(--border-color-light);
}
[data-bs-theme="dark"] footer {
    border-top: 1px solid var(--border-color-dark);
}

/* Dark mode toggle button style */
#theme-toggle {
    cursor: pointer;
}