* {
    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: 70px;
    display: flex;
    align-items: center;
    background: #fff;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid #f0f0f0;
}

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

.logo img {
    height: 27px;
}

nav a {
    margin: 0 15px;
    text-decoration: none;
    color: #333;
    font-size: 14px;
}

.btn-login {
    text-decoration: none;
    color: #333;
    font-size: 14px;
}

.hero {
    padding: 80px 0;
    background: linear-gradient(180deg, #fff 0%, #f9f9f9 100%);
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 10px;
}

.stars {
    color: #ff4d4f;
    font-size: 24px;
    margin-bottom: 20px;
}

.desc {
    font-size: 18px;
    color: #666;
    margin-bottom: 60px;
}

.hero-flex {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
}

.hero-demo img {
    max-width: 500px;
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.upload-box {
    background: #fff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    width: 400px;
}

.upload-area {
    border: 2px dashed #eee;
    padding: 40px;
    border-radius: 8px;
}

.upload-icon {
    font-size: 40px;
    margin-bottom: 20px;
}

.btn-download-main {
    display: inline-block;
    background-color: #333;
    color: #fff;
    padding: 12px 40px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: bold;
    margin: 20px 0;
}

.formats {
    font-size: 12px;
    color: #999;
}

.how-to {
    padding: 80px 0;
}

.how-to h3 {
    font-size: 32px;
    text-align: center;
    margin-bottom: 60px;
}

.step-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 60px;
}

.step-item {
    text-align: center;
}

.step-num {
    width: 40px;
    height: 40px;
    background-color: #333;
    color: #fff;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto 20px;
    font-weight: bold;
}

.step-item h4 {
    margin-bottom: 15px;
}

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

.center-btn {
    text-align: center;
}

.btn-primary.large {
    background-color: #333;
    color: #fff;
    padding: 15px 60px;
    border-radius: 4px;
    text-decoration: none;
    font-size: 18px;
}

footer {
    padding: 60px 0;
    text-align: center;
    background-color: #f9f9f9;
    border-top: 1px solid #eee;
}

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

.footer-links a {
    margin: 0 10px;
    color: #999;
    text-decoration: none;
    font-size: 14px;
}