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

:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --text-color: #333;
    --bg-color: #f5f5f5;
    --white: #ffffff;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand h1 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    gap: 1.5rem;
}

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

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

/* Flash Messages */
.flash-messages {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 1001;
}

.flash-message {
    padding: 1rem 1.5rem;
    margin-bottom: 0.5rem;
    border-radius: 5px;
    box-shadow: var(--shadow);
    animation: slideIn 0.3s ease;
}

.flash-success {
    background: var(--secondary-color);
    color: white;
}

.flash-error {
    background: #e74c3c;
    color: white;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Main Content */
main {
    flex: 1;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 5rem 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    animation: fadeInUp 1s ease;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    animation: fadeInUp 1.2s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Buttons */
.btn {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s;
}

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

.btn-primary:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.4);
}

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

.btn-secondary:hover {
    background: #27ae60;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(46, 204, 113, 0.4);
}

.btn-block {
    width: 100%;
    text-align: center;
}

/* Features Section */
.features-section {
    padding: 4rem 0;
    background: var(--white);
}

.features-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

/* Subscribe Section */
.subscribe-section {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
}

.subscribe-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.subscribe-section p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.subscribe-form {
    display: flex;
    max-width: 500px;
    margin: 0 auto;
    gap: 1rem;
}

.subscribe-form input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
}

.subscribe-form button {
    padding: 0.75rem 2rem;
}

.message {
    margin-top: 1rem;
    padding: 0.75rem;
    border-radius: 5px;
    display: none;
}

.message.success {
    background: rgba(46, 204, 113, 0.2);
    color: white;
    display: block;
}

.message.error {
    background: rgba(231, 76, 60, 0.2);
    color: white;
    display: block;
}

/* Chatbot Section */
.chatbot-section {
    padding: 4rem 0;
    background: var(--white);
}

.chatbot-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--text-color);
}

.chatbot-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-color);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.chatbot-messages {
    height: 400px;
    overflow-y: auto;
    padding: 1.5rem;
    background: var(--white);
}

.chat-message {
    margin-bottom: 1rem;
    padding: 1rem;
    border-radius: 10px;
    max-width: 70%;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.bot-message {
    background: var(--primary-color);
    color: white;
    margin-right: auto;
}

.user-message {
    background: var(--secondary-color);
    color: white;
    margin-left: auto;
}

.chatbot-input {
    display: flex;
    padding: 1rem;
    background: var(--bg-color);
    gap: 1rem;
}

.chatbot-input input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

.chatbot-input button {
    padding: 0.75rem 2rem;
}

/* Auth Pages */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
    padding: 2rem 0;
}

.auth-card {
    background: var(--white);
    padding: 3rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 400px;
}

.auth-card h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-color);
    font-size: 2rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.auth-link {
    text-align: center;
    margin-top: 1.5rem;
}

.auth-link a {
    color: var(--primary-color);
    text-decoration: none;
}

.auth-link a:hover {
    text-decoration: underline;
}

/* Admin Panel */
.admin-container {
    padding: 2rem 0;
}

.admin-container h1 {
    color: var(--primary-color);
    margin-bottom: 2rem;
}

.admin-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.stat-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    text-align: center;
}

.stat-card h3 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
}

.admin-section {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.admin-section h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.admin-form {
    max-width: 600px;
}

/* Footer */
footer {
    background: var(--text-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: auto;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .subscribe-form {
        flex-direction: column;
    }
    
    .nav-menu {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .chat-message {
        max-width: 85%;
    }
}