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

body {
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4edf9 100%);
    color: #333;
    line-height: 1.6;
}

header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: #2c3e50;
    display: flex;
    align-items: center;
    text-decoration: none;
}

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

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

nav ul li {
    margin-left: 2rem;
}

nav ul li a {
    text-decoration: none;
    color: #2c3e50;
    font-weight: 500;
    transition: color 0.3s;
}

nav ul li a:hover,
nav ul li a.active {
    color: #3498db;
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 10% 80px;
}

.hero-content {
    flex: 1;
    animation: fadeInLeft 1s ease-out;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    animation: fadeInRight 1s ease-out;
}

.hero-image img {
    max-width: 100%;
    height: auto;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #3498db, #2ecc71);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: #7f8c8d;
    margin-bottom: 2rem;
    max-width: 600px;
}

.btn-download {
    display: inline-block;
    background: linear-gradient(45deg, #3498db, #2ecc71);
    color: white;
    padding: 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.4);
    border: none;
    cursor: pointer;
}

.btn-download:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(52, 152, 219, 0.6);
}

.btn-outline {
    display: inline-block;
    margin-left: 12px;
    padding: 14px 28px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    color: #3498db;
    border: 2px solid #3498db;
    transition: all 0.3s;
}

.btn-outline:hover {
    background: #3498db;
    color: #fff;
}

.section {
    padding: 80px 10%;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(45deg, #3498db, #2ecc71);
    border-radius: 2px;
}

.section-desc {
    text-align: center;
    color: #7f8c8d;
    max-width: 720px;
    margin: -1.5rem auto 2rem;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.feature-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    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(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    color: #3498db;
}

.feature-card h3 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin-bottom: 15px;
}

.feature-card p {
    color: #7f8c8d;
}

.testimonials {
    background: linear-gradient(135deg, #e4edf9 0%, #f5f7fa 100%);
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

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

.testimonial-text {
    font-style: italic;
    color: #7f8c8d;
    margin-bottom: 20px;
}

.testimonial-author {
    display: flex;
    align-items: center;
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: #3498db;
    margin-right: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

.pricing {
    background: white;
}

.pricing-plans {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.pricing-card {
    background: white;
    border-radius: 15px;
    padding: 40px 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    text-align: center;
    border: 2px solid #f0f4f8;
    transition: transform 0.3s, border-color 0.3s;
}

.pricing-card.popular {
    border-color: #3498db;
    transform: scale(1.03);
}

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

.pricing-name {
    font-size: 1.8rem;
    color: #2c3e50;
    margin-bottom: 10px;
}

.pricing-price {
    font-size: 2.5rem;
    color: #3498db;
    font-weight: bold;
    margin-bottom: 20px;
}

.pricing-features {
    list-style: none;
    margin-bottom: 30px;
}

.pricing-features li {
    padding: 8px 0;
    color: #7f8c8d;
    border-bottom: 1px solid #eee;
}

.faq {
    background: linear-gradient(135deg, #e4edf9 0%, #f5f7fa 100%);
}

.faq-container {
    max-width: 800px;
    margin: 50px auto 0;
}

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

.faq-question {
    padding: 20px;
    background: #f8f9fa;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: bold;
    color: #2c3e50;
}

.faq-question::after {
    content: "▼";
    font-size: 0.8rem;
    color: #3498db;
    transition: transform 0.3s;
}

.faq-item.active .faq-question::after {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
    color: #7f8c8d;
}

.faq-item.active .faq-answer {
    padding: 20px;
    max-height: 800px;
}

.page-banner {
    padding: 140px 10% 60px;
    text-align: center;
}

.page-banner h1 {
    font-size: 2.6rem;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #3498db, #2ecc71);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.page-banner p {
    color: #7f8c8d;
    max-width: 700px;
    margin: 0 auto;
}

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

.download-card {
    background: #fff;
    border-radius: 15px;
    padding: 32px 24px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.download-card h3 {
    color: #2c3e50;
    margin: 12px 0;
}

.download-card p {
    color: #7f8c8d;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.article-list {
    display: grid;
    gap: 24px;
    max-width: 900px;
    margin: 40px auto 0;
}

.article-item {
    background: #fff;
    border-radius: 15px;
    padding: 28px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.article-item h2 {
    font-size: 1.4rem;
    margin-bottom: 10px;
}

.article-item h2 a {
    color: #2c3e50;
    text-decoration: none;
}

.article-item h2 a:hover {
    color: #3498db;
}

.article-meta {
    color: #95a5a6;
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.article-item p {
    color: #7f8c8d;
}

.article-body {
    max-width: 820px;
    margin: 0 auto;
    background: #fff;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.article-body h2 {
    color: #2c3e50;
    margin: 28px 0 12px;
    font-size: 1.4rem;
}

.article-body p {
    color: #555;
    margin-bottom: 16px;
}

.article-body ul {
    margin: 0 0 16px 1.2rem;
    color: #555;
}

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

.daily-box {
    background: linear-gradient(135deg, #eaf6ff, #f0fff6);
    border-left: 4px solid #3498db;
    border-radius: 10px;
    padding: 18px 20px;
    margin: 24px 0;
    color: #2c3e50;
}

.daily-box strong {
    color: #3498db;
}

footer {
    background: #2c3e50;
    color: white;
    padding: 50px 10% 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-section h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: #3498db;
}

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

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

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

.footer-section ul li a:hover {
    color: #3498db;
}

.footer-section p {
    color: #bdc3c7;
}

.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #34495e;
    color: #bdc3c7;
}

@keyframes fadeInLeft {
    from { opacity: 0; transform: translateX(-50px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeInRight {
    from { opacity: 0; transform: translateX(50px); }
    to { opacity: 1; transform: translateX(0); }
}

@media (max-width: 768px) {
    header {
        padding: 0.8rem 1rem;
    }

    .logo {
        font-size: 1.3rem;
    }

    nav ul {
        display: none;
    }

    .hero {
        flex-direction: column;
        text-align: center;
        padding: 110px 5% 60px;
    }

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

    .hero-content,
    .hero-image {
        flex: none;
        width: 100%;
    }

    .hero-image {
        margin-top: 40px;
    }

    .section {
        padding: 50px 5%;
    }

    .section-title {
        font-size: 2rem;
    }

    .btn-outline {
        margin: 12px 0 0;
        display: inline-block;
    }

    .pricing-card.popular {
        transform: none;
    }

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