:root {
    --main: #1677ff;
    --bg: #f5f7fb;
    --text: #333;
    --sub: #666;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont,
        "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

a {
    color: var(--main);
    text-decoration: none;
}

header {
    background: linear-gradient(135deg, #1677ff, #4facfe);
    color: #fff;
}

.header-inner {
    max-width: 1200px;
    margin: auto;
    padding: 24px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.brand {
    font-size: 20px;
    font-weight: 600;
}

nav a {
    margin: 0 12px;
    color: #fff;
    font-size: 15px;
}

.lang button {
    margin-left: 6px;
    padding: 4px 10px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
}

.hero {
    text-align: center;
    padding: 60px 20px 70px;
}

.hero h1 {
    font-size: 34px;
    margin-bottom: 16px;
}

.container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}

.section {
    background: #fff;
    border-radius: 10px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,.06);
    opacity: 0;
    transform: translateY(40px);
    transition: all .8s ease;
}

.section.show {
    opacity: 1;
    transform: none;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.card {
    border: 1px solid #e6ecf5;
    border-radius: 8px;
    padding: 24px;
    background: #fafcff;
}

footer {
    background: #fff;
    text-align: center;
    padding: 20px;
    font-size: 14px;
    color: var(--sub);
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 26px;
    }
    .section {
        padding: 26px;
    }
}