/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

a {
    color: #0066cc;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Header */
header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
}

header .logo h1 {
    font-size: 24px;
    color: #333;
}

header nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

header nav a {
    color: #666;
    font-weight: bold;
    font-size: 16px;
}

header nav a:hover, header nav a.active {
    color: #0066cc;
}

/* Hero Section */
.hero {
    background-color: #f4f7f6;
    text-align: center;
    padding: 60px 0;
    border-bottom: 1px solid #e1e8ed;
}

.hero-pro {
    background-color: #e6f0ff;
}

.hero h2 {
    font-size: 36px;
    margin-bottom: 20px;
    color: #111;
}

.hero p {
    font-size: 18px;
    color: #555;
    max-width: 800px;
    margin: 0 auto 30px;
}

.download-btns {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 15px;
}

.btn {
    display: inline-block;
    padding: 12px 25px;
    font-size: 18px;
    border-radius: 5px;
    text-align: center;
    cursor: pointer;
    text-decoration: none;
}

.primary-btn {
    background-color: #28a745;
    color: #fff;
}
.primary-btn:hover {
    background-color: #218838;
    color: #fff;
    text-decoration: none;
}

.secondary-btn {
    background-color: #007bff;
    color: #fff;
}
.secondary-btn:hover {
    background-color: #0069d9;
    color: #fff;
    text-decoration: none;
}

.pro-btn {
    background-color: #ff5722;
}
.pro-btn:hover {
    background-color: #e64a19;
}

.support-os {
    font-size: 14px;
    color: #888;
}

/* Features */
.features {
    padding: 50px 0;
    text-align: center;
}

.features h2 {
    font-size: 28px;
    margin-bottom: 40px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: #fdfdfd;
    padding: 25px;
    border: 1px solid #eee;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #222;
}

.feature-card p {
    font-size: 15px;
    color: #666;
}

/* Content Block */
.content-block {
    padding: 40px 0;
}

.content-block h2 {
    font-size: 28px;
    margin-bottom: 20px;
}

.content-block h3 {
    font-size: 22px;
    margin: 20px 0 10px;
}

.content-block p {
    font-size: 16px;
    margin-bottom: 15px;
    line-height: 1.8;
}

/* FAQ */
.faq {
    padding: 40px 0;
    background: #fafafa;
    border-top: 1px solid #eaeaea;
}

.faq h2 {
    font-size: 28px;
    margin-bottom: 30px;
    text-align: center;
}

.faq-item {
    margin-bottom: 25px;
}

.faq-item h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #333;
}

.faq-item p {
    font-size: 15px;
    color: #666;
}

/* Footer */
footer {
    background-color: #333;
    color: #ccc;
    text-align: center;
    padding: 30px 0;
    margin-top: 50px;
}

footer p {
    margin-bottom: 10px;
}

footer a {
    color: #aaa;
    margin: 0 10px;
}

footer a:hover {
    color: #fff;
}