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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

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

header {
    height: 60px;
    display: flex;
    align-items: center;
    background: #fff;
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    height: 30px;
    border-radius: 50%;
}

.logo span {
    font-weight: bold;
    font-size: 18px;
}

nav a {
    margin-left: 20px;
    text-decoration: none;
    color: #333;
    font-size: 14px;
}

.hero {
    padding: 100px 0;
    text-align: center;
    background: linear-gradient(180deg, #f0f4ff 0%, #fff 100%);
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 10px;
    color: #1a1a1a;
}

.subtitle {
    font-size: 20px;
    color: #666;
    margin-bottom: 60px;
}

.chat-demo {
    max-width: 800px;
    margin: 0 auto 60px;
}

.chat-input-box {
    background: #fff;
    padding: 20px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    border: 1px solid #eee;
}

.chat-input {
    text-align: left;
    color: #999;
}

.chat-btns {
    margin-top: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.chat-btns button {
    background: #f5f5f5;
    border: none;
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 13px;
    cursor: pointer;
    color: #666;
}

.hero-btns {
    margin-top: 40px;
}

.btn-primary {
    background-color: #3b82f6;
    color: #fff;
    padding: 15px 60px;
    border-radius: 30px;
    text-decoration: none;
    font-size: 20px;
    font-weight: bold;
    display: inline-block;
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.2);
}

.features {
    padding: 80px 0;
    background-color: #fff;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    text-align: center;
}

.feature-item h3 {
    margin-bottom: 15px;
    color: #3b82f6;
}

.feature-item p {
    font-size: 14px;
    color: #666;
}

footer {
    padding: 60px 0;
    text-align: center;
    border-top: 1px solid #eee;
}

.footer-links {
    margin-top: 20px;
}

.footer-links a {
    margin: 0 10px;
    color: #999;
    text-decoration: none;
    font-size: 13px;
}