:root {
    --primary: #2a9d8f;
    --secondary: #264653;
    --accent: #e9c46a;
    --light: #f1faee;
    --highlight: #e76f51;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

header {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
    color: white;
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.5rem;
}

.logo i {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

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

/* Auth Icons */
.auth-icons {
    display: flex;
    gap: 15px;
}

.auth-icon {
    font-size: 1.2rem;
    cursor: pointer;
    color: white;
    transition: color 0.3s;
}

.auth-icon:hover {
    color: var(--accent);
}

.user-menu {
    display: flex;
    align-items: center;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--accent);
    color: var(--secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.3s;
}

.user-avatar:hover {
    transform: scale(1.1);
}

/* Auth Modal Styles */
.auth-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.auth-content {
    background-color: white;
    padding: 2rem;
    border-radius: 10px;
    width: 90%;
    max-width: 400px;
    position: relative;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.close-auth {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 1.5rem;
    cursor: pointer;
    color: #777;
}

.auth-tabs {
    display: flex;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid #eee;
}

.auth-tab {
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    border-bottom: 3px solid transparent;
}

.auth-tab.active {
    border-bottom: 3px solid var(--primary);
    color: var(--primary);
    font-weight: bold;
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

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

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

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

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

.auth-btn {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    margin-top: 1rem;
    transition: background-color 0.3s;
}

.auth-btn:hover {
    background-color: #23867a;
}

.auth-message {
    margin-top: 1rem;
    padding: 0.5rem;
    border-radius: 4px;
    text-align: center;
    display: none;
}

.auth-message.success {
    background-color: #d4edda;
    color: #155724;
    display: block;
}

.auth-message.error {
    background-color: #f8d7da;
    color: #721c24;
    display: block;
}

.hero {
    background: linear-gradient(rgba(38, 70, 83, 0.8), rgba(38, 70, 83, 0.9)), url('https://images.unsplash.com/photo-1615791280558-8b7e2f8a7c3b?ixlib=rb-4.0.3') no-repeat center center/cover;
    color: white;
    padding: 4rem 2rem;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

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

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

.btn {
    display: inline-block;
    background-color: var(--highlight);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #d45a3c;
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

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

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--secondary);
    font-size: 2.2rem;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.feature-card {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s;
    text-align: center;
}

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

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

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

.demo-section {
    background-color: var(--light);
    padding: 4rem 2rem;
    border-radius: 10px;
    margin: 3rem 0;
}

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

.chat-header {
    background: var(--primary);
    color: white;
    padding: 1rem;
    text-align: center;
    font-weight: 600;
}

.chat-messages {
    padding: 1.5rem;
    height: 300px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message {
    max-width: 80%;
    padding: 1rem;
    border-radius: 10px;
    line-height: 1.4;
}

.ai-message {
    background: #e8f5f4;
    align-self: flex-start;
    border-bottom-left-radius: 0;
}

.user-message {
    background: #d4e6f5;
    align-self: flex-end;
    border-bottom-right-radius: 0;
}

.chat-input {
    display: flex;
    padding: 1rem;
    border-top: 1px solid #eee;
}

.chat-input input {
    flex: 1;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 50px;
    outline: none;
}

.chat-input button {
    margin-left: 1rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    text-align: center;
}

.stat-card i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.stat-card h3 {
    font-size: 2rem;
    color: var(--highlight);
    margin: 0.5rem 0;
}

footer {
    background: var(--secondary);
    color: white;
    padding: 3rem 2rem;
    text-align: center;
}

.footer-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--accent);
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin: 2rem 0;
}

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
    
    .auth-icons {
        gap: 10px;
    }
}
/* Chat Actions */
.chat-actions {
  padding: 0.5rem 1rem;
  border-top: 1px solid #eee;
  display: flex;
  justify-content: flex-end;
}

.btn-small {
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
}

/* Loading indicator */
.chat-loading {
  display: none;
  text-align: center;
  padding: 0.5rem;
  color: #666;
}

.chat-loading .dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--primary);
  margin: 0 2px;
  animation: bounce 1.5s infinite;
}

.chat-loading .dot:nth-child(2) {
  animation-delay: 0.2s;
}

.chat-loading .dot:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

/* Login reminder */
.login-reminder {
  background-color: #fff8e1;
  border-left: 4px solid #ffc107;
  padding: 1rem;
  margin: 1rem 0;
  border-radius: 4px;
}

.login-reminder p {
  margin: 0;
  color: #856404;
}