* {
    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: 1.6;
    min-height: 100vh;
}

header {
    background-color: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
}

.logo img {
    height: 40px;
    margin-right: 10px;
}

.logo h2 {
    font-size: 1.4rem;
    color: #2c3e50;
}

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

nav ul li {
    margin-left: 1.5rem;
}

nav ul li a {
    text-decoration: none;
    color: #4a6cf7;
    font-weight: 600;
    transition: color 0.3s;
}

nav ul li a:hover,
nav ul li a.active {
    color: #6c8eff;
}

.hero {
    display: flex;
    align-items: center;
    padding: 10rem 5% 5rem;
    min-height: 80vh;
    gap: 2rem;
}

.hero-content {
    flex: 1;
}

.hero h1 {
    font-size: 3.2rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #4a6cf7 0%, #6c8eff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.15rem;
    margin-bottom: 2rem;
    color: #555;
    max-width: 600px;
}

.hero-center {
    flex-direction: column;
    text-align: center;
    min-height: auto;
    padding: 8rem 5% 3rem;
}

.hero-center h1 {
    font-size: 2.8rem;
}

.hero-center p {
    margin: 0 auto 1.5rem;
}

.btn-download {
    display: inline-block;
    background: linear-gradient(135deg, #4a6cf7 0%, #6c8eff 100%);
    color: white;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 15px rgba(74, 108, 247, 0.3);
    border: none;
    cursor: pointer;
}

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

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

.btn-outline:hover {
    background: #f0f4ff;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    animation: float 6s ease-in-out infinite;
}

.hero-visual {
    width: 320px;
    height: 320px;
    border-radius: 24px;
    background: linear-gradient(145deg, #4a6cf7, #8fa4ff);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 20px 40px rgba(74, 108, 247, 0.25);
    color: white;
    font-size: 5rem;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-18px); }
}

section {
    padding: 4.5rem 5%;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title h2 {
    font-size: 2.3rem;
    color: #2c3e50;
    margin-bottom: 0.8rem;
}

.section-title p {
    color: #7f8c8d;
    max-width: 640px;
    margin: 0 auto;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(74, 108, 247, 0.15);
}

.feature-icon {
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, #4a6cf7 0%, #6c8eff 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.2rem;
    color: white;
    font-size: 1.8rem;
}

.feature-card h3 {
    margin-bottom: 0.8rem;
    color: #2c3e50;
}

.platforms {
    background: white;
    border-radius: 15px;
    padding: 3rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.platform-logos {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
    margin-top: 1.5rem;
}

.platform-logo {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 15px;
    background: #f8f9ff;
    font-size: 2.2rem;
    transition: transform 0.3s;
}

.platform-logo:hover {
    transform: scale(1.08);
}

.testimonials {
    background: linear-gradient(135deg, #4a6cf7 0%, #6c8eff 100%);
    color: white;
    text-align: center;
    border-radius: 15px;
    padding: 3.5rem 2rem;
}

.testimonial-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.testimonial-card {
    background: rgba(255, 255, 255, 0.12);
    border-radius: 15px;
    padding: 1.8rem;
    backdrop-filter: blur(10px);
    text-align: left;
}

.rating {
    color: #ffd700;
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
}

.faq-container {
    max-width: 820px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 1rem;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.faq-question {
    background: white;
    padding: 1.3rem 1.5rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 1.05rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.faq-answer {
    background: #f8f9ff;
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-answer.active {
    padding: 1.3rem 1.5rem;
    max-height: 1200px;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.download-card {
    background: white;
    border-radius: 15px;
    padding: 2rem 1.5rem;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s;
}

.download-card:hover {
    transform: translateY(-6px);
}

.download-card .icon {
    font-size: 2.8rem;
    margin-bottom: 1rem;
}

.download-card h3 {
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

.download-card p {
    color: #7f8c8d;
    font-size: 0.95rem;
    margin-bottom: 1.2rem;
}

.download-card .btn-download {
    padding: 0.75rem 1.6rem;
    font-size: 0.95rem;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.step-item {
    background: white;
    border-radius: 15px;
    padding: 1.8rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
    position: relative;
}

.step-num {
    width: 36px;
    height: 36px;
    background: #4a6cf7;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin-bottom: 1rem;
}

.article-list {
    display: grid;
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.article-item {
    background: white;
    border-radius: 15px;
    padding: 1.8rem 2rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s;
}

.article-item:hover {
    transform: translateY(-4px);
}

.article-item h3 {
    margin-bottom: 0.6rem;
}

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

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

.article-meta {
    color: #95a5a6;
    font-size: 0.9rem;
    margin-bottom: 0.8rem;
}

.article-item p {
    color: #555;
}

.article-page {
    max-width: 820px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    padding: 2.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.article-page h1 {
    font-size: 2rem;
    color: #2c3e50;
    margin-bottom: 1rem;
}

.article-page .article-meta {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #eee;
}

.article-body h2 {
    font-size: 1.35rem;
    color: #2c3e50;
    margin: 1.8rem 0 0.8rem;
}

.article-body p {
    margin-bottom: 1rem;
    color: #444;
}

.article-body ul {
    margin: 0.5rem 0 1.2rem 1.4rem;
    color: #444;
}

.article-body li {
    margin-bottom: 0.4rem;
}

.article-cta {
    margin-top: 2.5rem;
    padding: 1.5rem;
    background: #f8f9ff;
    border-radius: 12px;
    text-align: center;
}

.update-badge {
    display: inline-block;
    background: #eef2ff;
    color: #4a6cf7;
    font-size: 0.85rem;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    margin-left: 0.5rem;
}

footer {
    background: #2c3e50;
    color: white;
    padding: 3rem 5% 2rem;
    margin-top: 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1.2rem;
    font-size: 1.1rem;
}

.footer-section p {
    color: #bdc3c7;
    font-size: 0.95rem;
}

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

.footer-section ul li {
    margin-bottom: 0.7rem;
}

.footer-section ul li a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section ul li a:hover {
    color: white;
}

.copyright {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid #34495e;
    color: #bdc3c7;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 8rem 5% 3rem;
        min-height: auto;
    }

    .hero-content p {
        margin-left: auto;
        margin-right: auto;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero-visual {
        width: 220px;
        height: 220px;
        font-size: 3.5rem;
    }

    header {
        flex-direction: column;
        padding: 0.8rem 4%;
    }

    nav ul {
        margin-top: 0.8rem;
        justify-content: center;
    }

    nav ul li {
        margin: 0.4rem 0.6rem;
    }

    .article-page {
        padding: 1.5rem;
    }
}