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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.8;
    color: #1e293b;
    background-color: #f8fafc;
    overflow-x: hidden;
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #e2e8f0;
}
::-webkit-scrollbar-thumb {
    background: #2563eb;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #1d4ed8;
}

header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: #2563eb;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo::before {
    content: "⚡";
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-links a {
    text-decoration: none;
    color: #64748b;
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.3s;
    position: relative;
    padding: 0.5rem 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #2563eb, #60a5fa);
    transition: width 0.3s;
}

.nav-links a:hover {
    color: #2563eb;
}

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

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Hero 区域 */
.hero {
    text-align: center;
    padding: 8rem 2rem 4rem;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 50%, #bfdbfe 100%);
    border-radius: 0 0 50px 50px;
    margin: 0 -2rem 3rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.hero::after {
    content: '⬇️';
    position: absolute;
    top: 15%;
    right: 10%;
    font-size: 5rem;
    opacity: 0.2;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    color: #1e3a8a;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.4rem;
    color: #64748b;
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.download-notice {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: rgba(37, 99, 235, 0.1);
    border-radius: 50px;
    font-size: 1rem;
    color: #2563eb;
    font-weight: 500;
    border: 1px solid rgba(37, 99, 235, 0.2);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: #fff;
    box-shadow: 0 10px 40px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 50px rgba(37, 99, 235, 0.4);
}

.btn-secondary {
    background: #fff;
    color: #2563eb;
    border: 2px solid #2563eb;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.btn-secondary:hover {
    background: #2563eb;
    color: #fff;
    transform: translateY(-3px);
}

.btn-download {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: #fff;
    padding: 1.2rem 2rem;
    width: 100%;
    text-align: center;
    border-radius: 12px;
    font-weight: 600;
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.25);
}

.btn-download:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(37, 99, 235, 0.35);
}

.btn-large {
    padding: 1.2rem 3rem;
    font-size: 1.2rem;
}

section {
    padding: 5rem 0;
}

h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1e3a8a;
    margin-bottom: 1rem;
    text-align: center;
}

.section-desc {
    text-align: center;
    max-width: 700px;
    margin: -1rem auto 3rem;
    color: #64748b;
    font-size: 1.1rem;
}

/* 下载卡片网格 */
.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 2rem;
}

.download-card {
    background: #fff;
    border-radius: 24px;
    padding: 2.5rem 2rem;
    text-align: center;
    border: 1px solid #e2e8f0;
    transition: all 0.4s;
    position: relative;
    overflow: hidden;
}

.download-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, #2563eb, #60a5fa);
    transform: scaleX(0);
    transition: transform 0.4s;
}

.download-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 30px 60px rgba(37, 99, 235, 0.15);
    border-color: #bfdbfe;
}

.download-card:hover::before {
    transform: scaleX(1);
}

.card-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    display: block;
}

.download-card h3 {
    color: #1e3a8a;
    margin-bottom: 0.75rem;
    font-size: 1.5rem;
}

.version {
    color: #2563eb;
    font-weight: 600;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.feature-list {
    list-style: none;
    text-align: left;
    margin: 1.5rem 0;
}

.feature-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid #f1f5f9;
    color: #64748b;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.feature-list li:last-child {
    border-bottom: none;
}

.feature-list li::before {
    content: "✓";
    color: #2563eb;
    font-weight: bold;
}

.download-icon {
    margin-right: 0.5rem;
}

.file-info {
    font-size: 0.875rem;
    color: #94a3b8;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid #f1f5f9;
}

/* 安装教程 */
.installation-guide {
    background: #fff;
    padding: 5rem 2rem;
    border-radius: 30px;
    margin: 3rem 0;
    border: 1px solid #e2e8f0;
}

.guide-content {
    max-width: 900px;
    margin: 0 auto;
}

.guide-item {
    margin-bottom: 2.5rem;
    padding: 2.5rem;
    background: linear-gradient(135deg, #f8fafc 0%, #fff 100%);
    border-radius: 20px;
    border: 1px solid #e2e8f0;
}

.guide-item h3 {
    color: #2563eb;
    margin-bottom: 1.5rem;
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.guide-item ol {
    margin-left: 1.5rem;
    counter-reset: guide-step;
}

.guide-item li {
    margin-bottom: 1rem;
    padding-left: 0.5rem;
    color: #475569;
}

.guide-item dl {
    margin-top: 1.5rem;
}

.guide-item dt {
    font-weight: 600;
    color: #1e3a8a;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.guide-item dt::before {
    content: "💡";
}

.guide-item dt:first-child {
    margin-top: 0;
}

.guide-item dd {
    color: #64748b;
    margin-top: 0.5rem;
    padding-left: 1.5rem;
}

/* 定价套餐 */
.pricing-section {
    padding: 5rem 0;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.pricing-card {
    background: #fff;
    border-radius: 24px;
    padding: 3rem 2.5rem;
    text-align: center;
    border: 2px solid #e2e8f0;
    transition: all 0.4s;
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.1);
}

.pricing-card.featured {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border-color: #2563eb;
    transform: scale(1.05);
    box-shadow: 0 25px 50px rgba(37, 99, 235, 0.2);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-8px);
}

.pricing-card.featured::before {
    content: "推荐";
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #fff;
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
}

.pricing-card h3 {
    color: #1e3a8a;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.price {
    font-size: 3rem;
    font-weight: 800;
    color: #2563eb;
    margin-bottom: 2rem;
}

.price span {
    font-size: 1rem;
    font-weight: 400;
    color: #64748b;
}

.pricing-card ul {
    list-style: none;
    margin-bottom: 2.5rem;
}

.pricing-card li {
    padding: 1rem 0;
    border-bottom: 1px solid #e2e8f0;
    color: #64748b;
}

.pricing-card li:last-child {
    border-bottom: none;
}

.pricing-card li::before {
    content: "✓";
    color: #2563eb;
    margin-right: 0.75rem;
    font-weight: bold;
}

/* 安全提示 */
.security-notice {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    padding: 3.5rem;
    border-radius: 24px;
    border: 1px solid #bfdbfe;
    margin: 3rem 0;
}

.notice-content p {
    margin-bottom: 1.25rem;
    color: #475569;
    font-size: 1.05rem;
}

.notice-content p:last-child {
    margin-bottom: 0;
}

.notice-content strong {
    color: #1e3a8a;
}

/* 技术支持 */
.contact-support {
    text-align: center;
    padding: 5rem 2rem;
}

.contact-support h2 {
    margin-bottom: 1rem;
}

.contact-support > p {
    color: #64748b;
    margin-bottom: 3.5rem;
    font-size: 1.1rem;
}

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

.support-item {
    padding: 2.5rem 2rem;
    background: #fff;
    border-radius: 20px;
    border: 1px solid #e2e8f0;
    transition: all 0.3s;
}

.support-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
    border-color: #bfdbfe;
}

.support-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 1.25rem;
}

.support-item h3 {
    color: #1e3a8a;
    margin-bottom: 0.75rem;
    font-size: 1.2rem;
}

.support-item p {
    color: #2563eb;
    font-weight: 600;
}

/* Footer */
footer {
    background: linear-gradient(135deg, #1e3a8a 0%, #1e40af 100%);
    color: #fff;
    padding: 5rem 2rem 2rem;
    margin-top: 5rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
}

.footer-section h4 {
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
    color: #60a5fa;
}

.footer-section p {
    color: #94a3b8;
    line-height: 1.8;
}

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

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section a {
    color: #cbd5e1;
    text-decoration: none;
    transition: all 0.3s;
}

.footer-section a:hover {
    color: #60a5fa;
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 3rem;
    margin-top: 3rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #94a3b8;
}

.footer-bottom a {
    color: #60a5fa;
}

/* 响应式 */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 1.5rem;
    }

    .hero {
        padding: 6rem 1.5rem 3rem;
        border-radius: 0 0 30px 30px;
    }

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

    h2 {
        font-size: 1.8rem;
    }

    .download-grid {
        grid-template-columns: 1fr;
    }

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

    .pricing-card.featured:hover {
        transform: translateY(-8px);
    }

    .security-notice {
        padding: 2.5rem 1.5rem;
    }
}