/* 全局样式 - 必应SEO友好：简洁、快速加载、响应式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    --primary: #25D366;
    --primary-dark: #128C7E;
    --text: #333;
    --light: #f5f5f5;
    --white: #fff;
    --gray: #666;
}

body {
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 导航栏 */
.navbar {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 999;
    padding: 15px 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 600;
    color: var(--primary-dark);
}

.logo img {
    width: 35px;
    height: 35px;
}

.nav-menu {
    display: flex;
    gap: 30px;
}

.nav-menu a {
    font-size: 16px;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text);
    border-radius: 5px;
}

/* 英雄区 */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg, #f8fff9 0%, #e6f7ef 100%);
}

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

.hero-content {
    flex: 1;
}

.hero-content h1 {
    font-size: 42px;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--primary-dark);
}

.hero-content p {
    font-size: 18px;
    color: var(--gray);
    margin-bottom: 30px;
}

.btn-primary {
    display: inline-block;
    background: var(--primary);
    color: var(--white);
    padding: 14px 30px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    transition: background 0.3s;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.hero-img {
    flex: 1;
    text-align: center;
}

.hero-img img {
    max-width: 500px;
    margin: 0 auto;
}

/* 核心优势 */
.advantages {
    padding: 80px 0;
    text-align: center;
}

.advantages h2 {
    font-size: 32px;
    margin-bottom: 50px;
    color: var(--primary-dark);
}

.adv-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.adv-card {
    background: var(--white);
    padding: 30px 20px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s;
}

.adv-card:hover {
    transform: translateY(-10px);
}

.adv-card img {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
}

.adv-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--primary-dark);
}

.adv-card p {
    color: var(--gray);
}

/* 登录引导 */
.login-guide {
    padding: 80px 0;
    background: var(--light);
    text-align: center;
}

.login-guide h2 {
    font-size: 32px;
    margin-bottom: 40px;
    color: var(--primary-dark);
}

.login-steps {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.step {
    max-width: 300px;
}

.step span {
    display: inline-block;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    line-height: 50px;
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 20px;
}

.step p {
    font-size: 16px;
    color: var(--gray);
}

/* 页面头部 */
.page-header {
    padding: 60px 0;
    background: var(--light);
    text-align: center;
}

.page-header h1 {
    font-size: 36px;
    color: var(--primary-dark);
    margin-bottom: 15px;
}

.page-header p {
    font-size: 18px;
    color: var(--gray);
    max-width: 700px;
    margin: 0 auto;
}

/* 功能列表 */
.features-list {
    padding: 80px 0;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 40px;
    margin-bottom: 60px;
}

.feature-item.reverse {
    flex-direction: row-reverse;
}

.feature-img {
    flex: 1;
    text-align: center;
}

.feature-img img {
    width: 100px;
    height: 100px;
}

.feature-content {
    flex: 2;
}

.feature-content h2 {
    font-size: 28px;
    color: var(--primary-dark);
    margin-bottom: 15px;
}

.feature-content p {
    font-size: 16px;
    color: var(--gray);
}

/* 指南步骤 */
.guide-steps {
    padding: 80px 0;
}

.guide-steps h2 {
    font-size: 28px;
    color: var(--primary-dark);
    margin-bottom: 40px;
    text-align: center;
}

.step-card {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--white);
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    margin-bottom: 20px;
}

.step-num {
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    text-align: center;
    line-height: 50px;
    font-size: 20px;
    font-weight: 600;
    flex-shrink: 0;
}

.step-text h3 {
    font-size: 20px;
    color: var(--primary-dark);
    margin-bottom: 8px;
}

.step-text p {
    color: var(--gray);
}

/* 常见问题 */
.faq {
    padding: 80px 0;
    background: var(--light);
}

.faq h2 {
    font-size: 28px;
    color: var(--primary-dark);
    margin-bottom: 40px;
    text-align: center;
}

.faq-item {
    background: var(--white);
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    margin-bottom: 20px;
}

.faq-item h3 {
    font-size: 18px;
    color: var(--primary-dark);
    margin-bottom: 10px;
}

.faq-item p {
    color: var(--gray);
}

/* 页脚 */
.footer {
    background: var(--primary-dark);
    color: var(--white);
    padding: 40px 0;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.footer-links a {
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--primary);
}

/* 响应式 */
@media (max-width: 992px) {
    .hero-flex {
        flex-direction: column;
        text-align: center;
    }

    .feature-item,
    .feature-item.reverse {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .hero-content h1 {
        font-size: 32px;
    }
}