:root {
    --primary-color: #ff4081;
    --secondary-color: #ff80ab;
    --background-color: #fce4ec;
    --text-color: #333;
    --white: #fff;
    --header-bg: var(--white);
    --card-bg: var(--white);
    --shadow-color: rgba(0, 0, 0, 0.1);
    --testimonial-text: #666;
    --border-color: #ddd;
    --input-bg: #f9f9f9;
}

[data-theme="dark"] {
    --primary-color: #e91e63;
    --secondary-color: #f06292;
    --background-color: #1a1a2e;
    --text-color: #e0e0e0;
    --white: #2e2e4a; /* Darker white for contrast in dark mode */
    --header-bg: #2e2e4a;
    --card-bg: #3a3a5a;
    --shadow-color: rgba(0, 0, 0, 0.4);
    --testimonial-text: #bdbdbd;
    --border-color: #444;
    --input-bg: #2e2e4a;
}

body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

header {
    background-color: var(--header-bg);
    box-shadow: 0 2px 4px var(--shadow-color);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--primary-color);
}

.auth-buttons button {
    border: none;
    padding: 0.8rem 1.2rem;
    border-radius: 20px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.login-btn {
    background-color: transparent;
    color: var(--primary-color);
}

.signup-btn {
    background-color: var(--primary-color);
    color: var(--white);
}

.theme-switch button {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 0.8rem 1.2rem;
    border-radius: 20px;
    font-weight: bold;
    cursor: pointer;
    margin-left: 1rem;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.theme-switch button:hover {
    background-color: var(--secondary-color);
}

.hero {
    background-image: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('https://images.unsplash.com/photo-1524250502761-1ac6f2e30d43?q=80&w=1888&auto=format&fit=crop&ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D');
    background-size: cover;
    background-position: center;
    color: var(--white);
    text-align: center;
    padding: 6rem 2rem;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px var(--shadow-color);
}

.hero-content p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
}

.cta-btn {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 1rem 2.5rem;
    border: none;
    border-radius: 30px;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease;
    box-shadow: 0 4px 10px rgba(255, 64, 129, 0.4);
}

.cta-btn:hover {
    background-color: var(--secondary-color);
}

.featured-members, .how-it-works, .testimonials {
    padding: 4rem 2rem;
    text-align: center;
}

.featured-members h2, .how-it-works h2, .testimonials h2 {
    font-size: 2.8rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

.members-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
}

/* How It Works Section */
.how-it-works {
    background-color: var(--header-bg);
}

.steps-container {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.step {
    max-width: 300px;
}

.step i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.step h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

/* Testimonials Section */
.testimonials-container {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.testimonial-card {
    background-color: var(--card-bg);
    border-radius: 10px;
    box-shadow: 0 4px 8px var(--shadow-color);
    padding: 2rem;
    max-width: 320px;
    transition: transform 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
}

.testimonial-card:hover {
    transform: translateY(-10px);
}

.testimonial-card img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 1.5rem;
    border: 3px solid var(--primary-color);
}

.testimonial-card p {
    font-style: italic;
    color: var(--testimonial-text);
    margin-bottom: 1rem;
}

.testimonial-card h4 {
    font-size: 1.1rem;
    color: var(--primary-color);
}


footer {
    background-color: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: 2rem;
}

.footer-links {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1rem;
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .hero-content h1 {
        font-size: 2.5rem;
    }
}

/* --- New Styles for Bulletin Board and Chat --- */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

h1 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 2rem;
}

section {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 8px var(--shadow-color);
    margin-bottom: 2rem;
}

form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

form input[type="text"],
form input[type="password"],
form textarea {
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--input-bg);
    color: var(--text-color);
}

form textarea {
    min-height: 100px;
    resize: vertical;
}

form button {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 0.8rem 1.2rem;
    border: none;
    border-radius: 20px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

form button:hover {
    background-color: var(--secondary-color);
}

/* Bulletin Board Specific Styles */
.post-item {
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.post-item h3 {
    color: var(--primary-color);
    margin-top: 0;
}

.post-item small {
    color: var(--testimonial-text);
    display: block;
    margin-top: 0.5rem;
}

/* Chat Specific Styles */
#auth-section {
    text-align: center;
    margin-bottom: 2rem;
}

#auth-section form {
    max-width: 400px;
    margin: 1rem auto;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background-color: var(--card-bg);
}

#logout-button {
    background-color: #dc3545; /* Red for logout */
    color: var(--white);
    padding: 0.8rem 1.2rem;
    border: none;
    border-radius: 20px;
    font-weight: bold;
    cursor: pointer;
    margin-top: 1rem;
    transition: background-color 0.3s ease;
}

#logout-button:hover {
    background-color: #c82333;
}

#chat-section {
    display: flex;
    gap: 2rem;
    height: 60vh; /* Adjust height as needed */
    max-width: 1200px;
    margin: 2rem auto;
    background-color: var(--card-bg);
    border-radius: 10px;
    box-shadow: 0 4px 8px var(--shadow-color);
    overflow: hidden;
}

.chat-sidebar {
    width: 250px;
    border-right: 1px solid var(--border-color);
    padding: 1rem;
    background-color: var(--background-color);
    overflow-y: auto;
}

.chat-sidebar h3 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 1rem;
}

#user-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.user-item {
    padding: 0.5rem;
    cursor: pointer;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s ease;
}

.user-item:last-child {
    border-bottom: none;
}

.user-item:hover, .user-item.selected {
    background-color: var(--primary-color);
    color: var(--white);
}

.chat-main {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

#messages-container {
    flex-grow: 1;
    padding: 1rem;
    overflow-y: auto;
    background-color: var(--input-bg);
}

.chat-message {
    margin-bottom: 0.5rem;
    padding: 0.5rem;
    border-radius: 5px;
    background-color: var(--background-color);
}

#message-form {
    display: flex;
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    gap: 0.5rem;
}

#message-form input[type="text"] {
    flex-grow: 1;
}

#message-form button {
    padding: 0.5rem 1rem;
    border-radius: 5px;
}

/* Responsive adjustments for chat */
@media (max-width: 768px) {
    #chat-section {
        flex-direction: column;
        height: auto;
    }
    .chat-sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
}