/* ===== 公共样式 - 所有SEO页面共享 ===== */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", sans-serif;
    line-height: 1.8;
    color: #333;
    background: #f5f7fa;
}

/* ===== 导航栏 ===== */
.navbar {
    background: #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    padding: 0 20px;
    overflow-x: auto;
}

.navbar-logo {
    font-weight: 700;
    font-size: 1.1em;
    color: #667eea;
    text-decoration: none;
    padding: 14px 16px 14px 0;
    white-space: nowrap;
    border-bottom: 3px solid transparent;
}

.navbar a {
    text-decoration: none;
    color: #666;
    padding: 14px 14px;
    font-size: 0.95em;
    white-space: nowrap;
    border-bottom: 3px solid transparent;
    transition: color 0.2s, border-color 0.2s;
}

/* ===== 语言选择框靠右 ===== */
.lang-switch {
    margin-left: auto;
}

.lang-switch select {
    padding: 4px 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 0.9em;
    background: #fff;
    cursor: pointer;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* ===== 头部通用 ===== */
header {
    text-align: center;
    padding: 60px 20px 40px;
    color: #fff;
    border-radius: 16px;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.2em;
    margin-bottom: 10px;
}

header p {
    font-size: 1.1em;
    opacity: 0.9;
}

/* ===== 内容区块 ===== */
.section {
    background: #fff;
    border-radius: 12px;
    padding: 32px;
    margin-bottom: 24px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.section p {
    margin-bottom: 12px;
    color: #555;
}

.section ul {
    padding-left: 20px;
    margin-bottom: 12px;
}

.section li {
    margin-bottom: 8px;
    color: #555;
}

/* ===== CTA ===== */
.cta {
    text-align: center;
    margin: 40px 0;
}

.cta a {
    display: inline-block;
    color: #fff;
    padding: 16px 48px;
    border-radius: 50px;
    font-size: 1.2em;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
}

.cta a:hover {
    transform: translateY(-2px);
}

/* ===== Footer ===== */
footer {
    text-align: center;
    padding: 40px 20px;
    color: #999;
    font-size: 0.9em;
}

footer a {
    color: #667eea;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* ===== 响应式 ===== */
@media (max-width: 600px) {
    header h1 {
        font-size: 1.6em;
    }

    .section {
        padding: 20px;
    }

    .navbar a {
        padding: 14px 10px;
        font-size: 0.85em;
    }
}