:root {
    --primary-green: #1a5f3f;
    --dark-green: #0d3d26;
    --medium-green: #2d7a52;
    --light-green: #4a9d6e;
    --accent-green: #5cb88a;
    --text-dark: #1a1a1a;
    --text-light: #666666;
    --bg-light: #f5f7f6;
    --white: #ffffff;
    --shadow: rgba(26, 95, 63, 0.15);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

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

.site-header {
    background: var(--white);
    box-shadow: 0 2px 10px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: transform 0.3s ease;
}

.site-header.hidden {
    transform: translateY(-100%);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 50px;
    width: auto;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-green);
    transition: width 0.3s;
}

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

.nav-menu a:hover::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-green);
    transition: all 0.3s;
}

.nav-menu.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: 0 4px 10px var(--shadow);
    padding: 20px;
    gap: 15px;
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-green);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 4px 12px var(--shadow);
    transition: all 0.3s;
    z-index: 999;
}

.back-to-top:hover {
    background: var(--medium-green);
    transform: translateY(-3px);
    box-shadow: 0 6px 18px var(--shadow);
}

.back-to-top.visible {
    display: flex;
}

.hero-banner {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--dark-green) 0%, var(--primary-green) 50%, var(--medium-green) 100%);
    color: var(--white);
    text-align: center;
    padding: 120px 20px 80px;
    overflow: hidden;
}

.hero-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.banner-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    margin: 0 auto;
}

.banner-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 30px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
    letter-spacing: -0.5px;
}

.banner-subtitle {
    font-size: 1.3rem;
    line-height: 1.8;
    margin-bottom: 50px;
    opacity: 0.95;
    font-weight: 300;
}

.banner-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-green);
    margin-bottom: 8px;
}

.stat-label {
    display: block;
    font-size: 1rem;
    opacity: 0.9;
}

.banner-cta {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.cta-btn {
    padding: 18px 45px;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
    position: relative;
    overflow: hidden;
}

.cta-primary {
    background: var(--white);
    color: var(--primary-green);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.cta-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

.cta-primary::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: var(--accent-green);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
    z-index: -1;
}

.cta-primary:hover::before {
    width: 300px;
    height: 300px;
}

.cta-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.cta-secondary:hover {
    background: var(--white);
    color: var(--primary-green);
    transform: translateY(-2px);
}

.banner-trust {
    font-size: 0.95rem;
    opacity: 0.85;
    margin-top: 20px;
}

.content-section {
    padding: 80px 0;
}

.content-section:nth-child(even) {
    background: var(--bg-light);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-green);
    text-align: center;
    margin-bottom: 20px;
}

.section-intro {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto 50px;
}

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

.feature-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-green);
    transform: scaleY(0);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow);
}

.feature-card:hover::before {
    transform: scaleY(1);
}

.feature-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-green);
    opacity: 0.2;
    line-height: 1;
    margin-bottom: 15px;
}

.feature-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--primary-green);
    margin-bottom: 15px;
}

.feature-image-wrapper {
    margin-bottom: 20px;
    border-radius: 8px;
    overflow: hidden;
    background: var(--bg-light);
}

.feature-image {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.3s;
}

.feature-card:hover .feature-image {
    transform: scale(1.05);
}

.feature-desc {
    color: var(--text-light);
    line-height: 1.7;
}

.process-list {
    list-style: none;
    max-width: 900px;
    margin: 50px auto 0;
    counter-reset: process-counter;
}

.process-item {
    display: flex;
    gap: 30px;
    margin-bottom: 40px;
    align-items: flex-start;
    counter-increment: process-counter;
}

.process-icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: var(--primary-green);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    box-shadow: 0 4px 10px var(--shadow);
}

.process-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-green);
    margin-bottom: 10px;
}

.process-desc {
    color: var(--text-light);
    line-height: 1.7;
}

.process-visual {
    text-align: center;
    margin-bottom: 50px;
}

.process-main-image {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 15px var(--shadow);
}

.pricing-table-wrapper {
    overflow-x: auto;
    margin-top: 50px;
}

.pricing-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
    box-shadow: 0 4px 15px var(--shadow);
    border-radius: 12px;
    overflow: hidden;
}

.pricing-table thead {
    background: var(--primary-green);
    color: var(--white);
}

.pricing-table th,
.pricing-table td {
    padding: 20px;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.pricing-table th {
    font-weight: 600;
    font-size: 1.1rem;
}

.pricing-table tbody tr:hover {
    background: var(--bg-light);
}

.pricing-table tbody tr:last-child td {
    border-bottom: none;
}

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

.faq-question {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-green);
    margin-bottom: 15px;
    padding: 20px;
    background: var(--white);
    border-left: 4px solid var(--primary-green);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s;
}

.faq-question:hover {
    background: var(--bg-light);
}

.faq-answer {
    margin-bottom: 25px;
    padding: 0 20px 20px 20px;
    color: var(--text-light);
    line-height: 1.8;
}

.site-footer {
    background: var(--dark-green);
    color: var(--white);
    padding: 40px 20px;
    text-align: center;
}

.footer-text {
    font-size: 1rem;
    margin-bottom: 15px;
    opacity: 0.9;
}

.footer-contact {
    font-size: 0.9rem;
    opacity: 0.8;
}

.footer-contact a {
    color: var(--accent-green);
    text-decoration: none;
}

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

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .banner-title {
        font-size: 2.2rem;
    }
    
    .banner-subtitle {
        font-size: 1.1rem;
    }
    
    .banner-stats {
        gap: 30px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .process-item {
        flex-direction: column;
        gap: 15px;
    }
}

.application-list {
    list-style: none;
    max-width: 900px;
    margin: 50px auto 0;
}

.application-item {
    display: flex;
    gap: 25px;
    margin-bottom: 35px;
    padding: 30px;
    background: var(--white);
    border-radius: 12px;
    box-shadow: 0 3px 12px var(--shadow);
    align-items: flex-start;
    transition: transform 0.3s, box-shadow 0.3s;
}

.application-item:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 20px var(--shadow);
}

.item-number {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: var(--primary-green);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 700;
}

.item-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-green);
    margin-bottom: 10px;
}

.item-desc {
    color: var(--text-light);
    line-height: 1.7;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-top: 50px;
}

.tech-card {
    background: var(--white);
    padding: 35px 25px;
    border-radius: 10px;
    border: 2px solid var(--light-green);
    transition: all 0.3s;
}

.tech-card:hover {
    border-color: var(--primary-green);
    box-shadow: 0 5px 15px var(--shadow);
    transform: translateY(-3px);
}

.tech-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-green);
    margin-bottom: 12px;
}

.tech-desc {
    color: var(--text-light);
    line-height: 1.7;
}

.comparison-table-wrapper {
    overflow-x: auto;
    margin-top: 50px;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
    box-shadow: 0 4px 15px var(--shadow);
    border-radius: 12px;
    overflow: hidden;
}

.comparison-table thead {
    background: var(--medium-green);
    color: var(--white);
}

.comparison-table th,
.comparison-table td {
    padding: 18px;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.comparison-table th {
    font-weight: 600;
}

.comparison-table tbody tr:nth-child(even) {
    background: var(--bg-light);
}

.comparison-table tbody tr:hover {
    background: #e8f5e9;
}

.journals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 25px;
    margin-top: 50px;
}

.journal-item {
    background: var(--white);
    padding: 30px 20px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 3px 12px var(--shadow);
    transition: transform 0.3s;
}

.journal-item:hover {
    transform: translateY(-5px);
}

.journal-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-green);
    margin-bottom: 10px;
}

.journal-desc {
    color: var(--text-light);
    font-size: 0.95rem;
}

.publishers-logo {
    text-align: center;
    margin: 40px 0;
}

.publishers-main-logo {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

.journal-logo {
    max-width: 100%;
    height: auto;
    margin-bottom: 15px;
    object-fit: contain;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 30px;
    margin-top: 50px;
    align-items: center;
    justify-items: center;
}

.partner-logo {
    max-width: 100%;
    height: auto;
    opacity: 0.7;
    transition: opacity 0.3s, transform 0.3s;
    filter: grayscale(30%);
}

.partner-logo:hover {
    opacity: 1;
    transform: scale(1.1);
    filter: grayscale(0%);
}

.tutorial-demo {
    text-align: center;
    margin-bottom: 50px;
}

.tutorial-demo-image {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 15px var(--shadow);
}

.security-list {
    list-style: none;
    max-width: 900px;
    margin: 50px auto 0;
    counter-reset: security-counter;
}

.security-item {
    display: flex;
    gap: 25px;
    margin-bottom: 30px;
    padding: 25px;
    background: var(--white);
    border-radius: 10px;
    border-left: 5px solid var(--primary-green);
    align-items: flex-start;
}

.security-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-green);
    margin-bottom: 8px;
}

.security-desc {
    color: var(--text-light);
    line-height: 1.7;
}

.tutorial-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.tutorial-step {
    background: var(--white);
    padding: 35px 25px;
    border-radius: 12px;
    box-shadow: 0 4px 15px var(--shadow);
    text-align: center;
    transition: transform 0.3s;
}

.tutorial-step:hover {
    transform: translateY(-5px);
}

.step-number {
    display: inline-block;
    width: 60px;
    height: 60px;
    background: var(--primary-green);
    color: var(--white);
    border-radius: 50%;
    line-height: 60px;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.step-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-green);
    margin-bottom: 12px;
}

.step-desc {
    color: var(--text-light);
    line-height: 1.7;
}

.advantages-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-top: 50px;
}

.advantage-card {
    background: var(--white);
    padding: 30px 25px;
    border-radius: 10px;
    box-shadow: 0 3px 12px var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: all 0.3s;
}

.advantage-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px var(--shadow);
}

.advantage-icon {
    width: 50px;
    height: 50px;
    background: var(--accent-green);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.advantage-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-green);
    margin-bottom: 12px;
}

.advantage-text {
    color: var(--text-light);
    line-height: 1.7;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 25px;
    margin-top: 50px;
}

.tip-card {
    background: var(--white);
    padding: 30px 25px;
    border-radius: 10px;
    border-top: 4px solid var(--primary-green);
    box-shadow: 0 3px 12px var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.tip-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 18px var(--shadow);
}

.tip-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-green);
    margin-bottom: 12px;
}

.tip-content {
    color: var(--text-light);
    line-height: 1.7;
}

.related-faq-list {
    max-width: 900px;
    margin: 50px auto 0;
}

.related-faq-q {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--primary-green);
    margin-bottom: 12px;
    padding: 18px 20px;
    background: var(--white);
    border-left: 4px solid var(--accent-green);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s;
}

.related-faq-q:hover {
    background: var(--bg-light);
}

.related-faq-a {
    margin-bottom: 20px;
    padding: 0 20px 20px 20px;
    color: var(--text-light);
    line-height: 1.8;
    display: none;
}