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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
}

nav {
    background: #333;
    padding: 1rem;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 1rem;
}

nav a {
    color: white;
    text-decoration: none;
}

.container {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1rem;
}

input[type="url"] {
    width: 100%;
    padding: 0.5rem;
    margin-top: 0.5rem;
}

button {
    background: #333;
    color: white;
    padding: 0.5rem 1rem;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #444;
}

.result {
    margin-top: 2rem;
    padding: 1rem;
    border: 1px solid #ddd;
}

.article-content {
    margin-top: 1rem;
    white-space: pre-line;
}

.error {
    color: red;
    margin-top: 1rem;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    nav ul {
        flex-direction: column;
    }
}

.chat-container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 1rem;
    height: 80vh;
    display: flex;
    flex-direction: column;
}

.chat-messages {
    flex-grow: 1;
    overflow-y: auto;
    padding: 1rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.message {
    margin-bottom: 1rem;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    max-width: 80%;
}

.message.user {
    background-color: #e3f2fd;
    margin-left: auto;
}

.message.assistant {
    background-color: #f5f5f5;
    margin-right: auto;
}

.message.error {
    background-color: #ffebee;
    color: #c62828;
    margin: 0 auto;
}

.chat-input-form {
    display: flex;
    gap: 1rem;
}

.input-group {
    display: flex;
    gap: 0.5rem;
    width: 100%;
}

.input-group input {
    flex-grow: 1;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.input-group button {
    padding: 0.5rem 1rem;
    background-color: #2196f3;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.input-group button:hover {
    background-color: #1976d2;
}

@media (max-width: 768px) {
    .chat-container {
        height: 90vh;
        margin: 1rem;
    }
    
    .message {
        max-width: 90%;
    }
}

nav {
    background: #333;
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0;
}

nav li {
    padding: 0;
}

nav a {
    color: white;
    text-decoration: none;
    font-size: 1rem;
    transition: color 0.3s ease;
}

nav a:hover {
    color: #2196f3;
}

nav a.active {
    color: #2196f3;
}

@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        gap: 1rem;
    }
    
    nav {
        padding: 0.5rem;
    }
}

/* Navbar Styles */
.navbar {
    background: #333;
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    color: white;
    font-size: 1.25rem;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 2rem;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-size: 1rem;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #2196f3;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger {
    display: block;
    position: relative;
    width: 24px;
    height: 2px;
    background: white;
    transition: all 0.3s ease-in-out;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: white;
    transition: all 0.3s ease-in-out;
}

.hamburger::before {
    transform: translateY(-8px);
}

.hamburger::after {
    transform: translateY(8px);
}

.nav-toggle-active .hamburger {
    background: transparent;
}

.nav-toggle-active .hamburger::before {
    transform: rotate(45deg);
}

.nav-toggle-active .hamburger::after {
    transform: rotate(-45deg);
}

/* Mobile Styles */
@media screen and (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #333;
        flex-direction: column;
        gap: 0;
        padding: 0;
        box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    }

    .nav-menu.nav-active {
        display: flex;
    }

    .nav-menu li {
        width: 100%;
    }

    .nav-link {
        display: block;
        padding: 1rem;
        text-align: center;
        border-top: 1px solid rgba(255,255,255,0.1);
    }

    .nav-link:hover {
        background: rgba(255,255,255,0.1);
    }

    .nav-toggle {
        display: block;
    }
}

/* Animation for menu items */
@media screen and (max-width: 768px) {
    .nav-menu.nav-active {
        animation: slideDown 0.3s ease-out forwards;
    }

    @keyframes slideDown {
        from {
            opacity: 0;
            transform: translateY(-10px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
}

.auth-container {
    max-width: 400px;
    margin: 2rem auto;
    padding: 1rem;
}

.auth-box {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.error-message {
    color: #dc3545;
    margin-bottom: 1rem;
    padding: 0.5rem;
    background: #ffebee;
    border-radius: 4px;
}

.admin-container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 1rem;
}

.users-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.users-table th,
.users-table td {
    padding: 0.75rem;
    border: 1px solid #ddd;
}

.users-table th {
    background: #f5f5f5;
}

.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: #2196f3;
    color: white;
    text-decoration: none;
    border-radius: 4px;
}

.btn-delete {
    background: #dc3545;
    color: white;
    border: none;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
}

.actions {
    margin-bottom: 1rem;
}

@media (max-width: 768px) {
    .users-table {
        display: block;
        overflow-x: auto;
    }
}

/* Error page styles */
.error-container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    text-align: center;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.error-container h1 {
    color: #dc3545;
    margin-bottom: 1rem;
}

.error-container .btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: #2196f3;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    margin-top: 1rem;
}

/* Auth form styles */
.auth-container {
    max-width: 400px;
    margin: 4rem auto;
    padding: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.auth-container h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.error-message {
    background: #ffebee;
    color: #dc3545;
    padding: 0.75rem;
    border-radius: 4px;
    margin-bottom: 1.5rem;
    text-align: center;
}

button[type="submit"] {
    width: 100%;
    padding: 0.75rem;
    background: #2196f3;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s ease;
}

button[type="submit"]:hover {
    background: #1976d2;
}