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

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4edf9 100%);
    color: #333;
    line-height: 1.7;
}

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

header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 0;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 22px;
    font-weight: 700;
    color: #4a6cf7;
    text-decoration: none;
}

.logo img {
    height: 36px;
    width: 36px;
    margin-right: 10px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
    list-style: none;
    flex-wrap: wrap;
}

.nav-links li {
    margin-left: 28px;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
    color: #4a6cf7;
}

section {
    padding: 90px 0;
}

.hero {
    padding-top: 140px;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 48px;
}

.hero-text {
    flex: 1;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}

.hero-visual {
    width: 320px;
    height: 320px;
    border-radius: 50%;
    background: linear-gradient(145deg, #4a6cf7, #7b93f9);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 20px 50px rgba(74, 108, 247, 0.35);
    color: #fff;
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: 4px;
}

h1 {
    font-size: 2.8rem;
    margin-bottom: 18px;
    color: #2c3e50;
    line-height: 1.25;
}

h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 12px;
    color: #2c3e50;
}

.section-desc {
    text-align: center;
    color: #666;
    margin-bottom: 40px;
    font-size: 1.1rem;
}

p {
    font-size: 1.1rem;
    margin-bottom: 24px;
    color: #555;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    background: #4a6cf7;
    color: #fff;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 700;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(74, 108, 247, 0.3);
    border: none;
    cursor: pointer;
}

.btn:hover {
    background: #3a5be0;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(74, 108, 247, 0.4);
}

.btn-outline {
    background: transparent;
    color: #4a6cf7;
    border: 2px solid #4a6cf7;
    box-shadow: none;
    margin-left: 12px;
}

.btn-outline:hover {
    background: #4a6cf7;
    color: #fff;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
    margin-top: 40px;
}

.feature-card {
    background: #fff;
    padding: 28px;
    border-radius: 14px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 36px rgba(74, 108, 247, 0.12);
}

.feature-card .icon {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    background: rgba(74, 108, 247, 0.12);
    color: #4a6cf7;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 10px;
    color: #2c3e50;
}

.feature-card p {
    font-size: 0.98rem;
    margin-bottom: 0;
    color: #666;
}

.alt-bg {
    background: rgba(255, 255, 255, 0.55);
}

.testimonials {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 36px;
}

.testimonial-card {
    background: #fff;
    padding: 26px;
    border-radius: 14px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
}

.testimonial-card p {
    font-size: 1rem;
    font-style: italic;
    margin-bottom: 16px;
}

.testimonial-card .author {
    font-style: normal;
    font-weight: 600;
    color: #4a6cf7;
    margin: 0;
    font-size: 0.95rem;
}

.faq-list {
    max-width: 860px;
    margin: 36px auto 0;
}

.faq-item {
    background: #fff;
    border-radius: 12px;
    margin-bottom: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
    overflow: hidden;
}

.faq-question {
    padding: 18px 22px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: #2c3e50;
    user-select: none;
}

.faq-question span {
    color: #4a6cf7;
    font-size: 1.3rem;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
    padding: 0 22px;
    color: #555;
}

.faq-answer.active {
    max-height: 500px;
    padding: 0 22px 18px;
}

.page-hero {
    padding: 140px 0 60px;
    text-align: center;
}

.page-hero h1 {
    font-size: 2.4rem;
}

.page-hero p {
    max-width: 720px;
    margin: 0 auto 28px;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin: 40px 0 60px;
}

.download-card {
    background: #fff;
    border-radius: 14px;
    padding: 32px 24px;
    text-align: center;
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.06);
}

.download-card h3 {
    margin: 14px 0 8px;
    color: #2c3e50;
}

.download-card p {
    font-size: 0.95rem;
    margin-bottom: 20px;
}

.platform-icon {
    font-size: 2.4rem;
    color: #4a6cf7;
}

.article-list {
    display: grid;
    gap: 24px;
    margin: 40px 0 80px;
}

.article-card {
    background: #fff;
    border-radius: 14px;
    padding: 28px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
}

.article-card h3 {
    margin-bottom: 10px;
}

.article-card h3 a {
    color: #2c3e50;
    text-decoration: none;
}

.article-card h3 a:hover {
    color: #4a6cf7;
}

.article-meta {
    font-size: 0.9rem;
    color: #888;
    margin-bottom: 12px;
}

.article-card p {
    font-size: 1rem;
    margin-bottom: 14px;
}

.read-more {
    color: #4a6cf7;
    text-decoration: none;
    font-weight: 600;
}

.article-body {
    background: #fff;
    border-radius: 14px;
    padding: 40px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
    margin-bottom: 80px;
    max-width: 860px;
    margin-left: auto;
    margin-right: auto;
}

.article-body h1 {
    font-size: 2rem;
    margin-bottom: 12px;
}

.article-body h2 {
    text-align: left;
    font-size: 1.35rem;
    margin: 28px 0 12px;
}

.article-body p {
    font-size: 1.05rem;
    margin-bottom: 16px;
}

.article-body ul {
    margin: 0 0 18px 22px;
    color: #555;
}

.article-body li {
    margin-bottom: 8px;
}

.update-banner {
    background: linear-gradient(90deg, rgba(74, 108, 247, 0.1), rgba(74, 108, 247, 0.04));
    border-left: 4px solid #4a6cf7;
    padding: 14px 18px;
    border-radius: 8px;
    margin-bottom: 24px;
    font-size: 0.95rem;
    color: #445;
}

.update-banner strong {
    color: #4a6cf7;
}

footer {
    background: #1e293b;
    color: #cbd5e1;
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.footer-section h3 {
    color: #fff;
    margin-bottom: 16px;
    font-size: 1.05rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 10px;
}

.footer-section a {
    color: #94a3b8;
    text-decoration: none;
    transition: color 0.2s;
}

.footer-section a:hover {
    color: #fff;
}

.copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 22px;
    text-align: center;
    font-size: 0.9rem;
    color: #64748b;
}

.copyright p {
    margin: 0;
    font-size: 0.9rem;
    color: #64748b;
}

.steps {
    counter-reset: step;
    list-style: none;
    margin: 20px 0;
}

.steps li {
    position: relative;
    padding: 16px 16px 16px 56px;
    background: #fff;
    border-radius: 10px;
    margin-bottom: 12px;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.04);
}

.steps li::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    background: #4a6cf7;
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
}

@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 12px;
    }

    .nav-links {
        justify-content: center;
    }

    .nav-links li {
        margin: 0 10px;
    }

    .hero-content {
        flex-direction: column;
        text-align: center;
    }

    h1 {
        font-size: 2rem;
    }

    .hero-visual {
        width: 220px;
        height: 220px;
        font-size: 2rem;
    }

    .btn-outline {
        margin-left: 0;
        margin-top: 12px;
    }

    .article-body {
        padding: 24px 18px;
    }
}