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

:root {
    --primary-green: #2e7d32;
    --secondary-green: #4caf50;
    --light-green: #e8f5e9;
    --dark-green: #1b5e20;
    --white: #ffffff;
    --gray: #f5f5f5;
    --dark-gray: #333333;
}

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    background-color: var(--gray);
}

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

/* Navigation */
.navbar {
    background: var(--primary-green);
    padding: 1rem 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    color: var(--white);
    font-size: 1.5rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.nav-link {
    color: var(--white);
    text-decoration: none;
    transition: color 0.3s;
}

.nav-link:hover {
    color: var(--light-green);
}

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

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
}

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

.btn-primary:hover {
    background: var(--light-green);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

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

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

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--light-green);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s;
}

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

.feature-card i {
    font-size: 3rem;
    color: var(--primary-green);
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: var(--dark-green);
}

/* Forms */
.form-container {
    max-width: 400px;
    margin: 2rem auto;
    padding: 2rem;
    background: var(--white);
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

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

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

.form-group input {
    width: 100%;
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

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

/* Chat Interface */
.chat-container {
    max-width: 800px;
    margin: 2rem auto;
    background: var(--white);
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    overflow: hidden;
}

.chat-header {
    background: var(--primary-green);
    color: var(--white);
    padding: 1rem;
    text-align: center;
}

.chat-messages {
    height: 400px;
    overflow-y: auto;
    padding: 1rem;
    background: var(--light-green);
}

.message {
    margin-bottom: 1rem;
    padding: 0.8rem;
    border-radius: 10px;
    max-width: 80%;
}

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

.ai-message {
    background: var(--white);
    color: var(--dark-gray);
    border: 1px solid #ddd;
}

.chat-input {
    display: flex;
    padding: 1rem;
    background: var(--white);
    border-top: 1px solid #ddd;
}

.chat-input input {
    flex: 1;
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: 5px;
    margin-right: 10px;
}

.chat-input button {
    background: var(--primary-green);
    color: var(--white);
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
}

/* Medicine and Disease Cards */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.card {
    background: var(--white);
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    border-left: 4px solid var(--primary-green);
}

.card h3 {
    color: var(--dark-green);
    margin-bottom: 1rem;
}

.card-price {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-green);
    margin: 1rem 0;
}

/* Filters */
.filters {
    background: var(--white);
    padding: 1rem;
    border-radius: 10px;
    margin-bottom: 2rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-select {
    padding: 8px 12px;
    border: 2px solid #ddd;
    border-radius: 5px;
    background: var(--white);
}

/* Footer */
.footer {
    background: var(--dark-green);
    color: var(--white);
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}