/* 蓝色渐变首屏，官方下载按钮居中 CSS */
:root {
    --primary-color: #0052D9; /* 核心蓝 */
    --primary-hover: #003CAB;
    --text-main: #1D2129;
    --text-sub: #4E5969;
    --bg-light: #F2F3F5;
    --border-color: #E5E6EB;
    --radius: 8px;
    --shadow-sm: 0 4px 10px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    color: var(--text-main);
    line-height: 1.6;
    background-color: #fff;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius);
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.3s ease;
}

.btn-lg { padding: 12px 32px; font-size: 16px; }
.btn-xl { padding: 14px 40px; font-size: 18px; font-weight: 600; border-radius: 30px; }
.btn-block { display: flex; width: 100%; }

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background-color: #F2F5FC;
}

.btn-white {
    background-color: #fff;
    color: var(--primary-color);
}

.btn-white:hover {
    background-color: #F2F3F5;
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
}

.btn-outline-white {
    background-color: transparent;
    border-color: rgba(255,255,255,0.6);
    color: #fff;
}

.btn-outline-white:hover {
    background-color: rgba(255,255,255,0.1);
    border-color: #fff;
    transform: translateY(-2px);
}

/* Navbar */
.navbar {
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 30px;
    height: 30px;
    background-color: var(--primary-color);
    border-radius: 6px;
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-main);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-menu a {
    font-size: 15px;
    color: var(--text-sub);
    font-weight: 500;
}

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

/* Hero Section (蓝色渐变首屏，官方下载按钮居中) */
.hero-gradient {
    background: linear-gradient(135deg, #0052D9 0%, #002B7A 100%);
    color: #fff;
    padding: 100px 0 0 0; /* No bottom padding, let image sit on bottom */
    text-align: center;
    overflow: hidden;
}

.page-hero {
    padding-bottom: 80px;
}

.hero-content {
    max-width: 860px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background-color: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 24px;
}

.hero-content h1 {
    font-size: 52px;
    line-height: 1.2;
    font-weight: 800;
    margin-bottom: 24px;
    letter-spacing: 1px;
}

.hero-content p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 60px;
}

.hero-image-wrapper {
    max-width: 1000px;
    margin: 0 auto;
    transform: translateY(20px); /* Slightly push down */
}

.hero-img {
    width: 100%;
    border-radius: 12px 12px 0 0;
    box-shadow: var(--shadow-lg);
    display: block;
    border: 1px solid rgba(255,255,255,0.1);
    border-bottom: none;
}

/* Data Section */
.data-section {
    background-color: #fff;
    padding: 60px 0;
    border-bottom: 1px solid var(--border-color);
}

.data-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.data-num {
    font-size: 40px;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.data-desc {
    font-size: 15px;
    color: var(--text-sub);
}

/* Features */
.features-section {
    padding: 100px 0;
    background-color: var(--bg-light);
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.section-title p {
    font-size: 18px;
    color: var(--text-sub);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    background-color: #fff;
    padding: 40px 32px;
    border-radius: var(--radius);
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.feature-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
    border-color: var(--border-color);
}

.f-icon {
    font-size: 40px;
    margin-bottom: 24px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 16px;
    font-weight: 600;
}

.feature-card p {
    color: var(--text-sub);
    font-size: 15px;
    line-height: 1.7;
}

/* Solutions */
.solutions-section {
    padding: 100px 0;
    background-color: #fff;
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.solution-card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    transition: box-shadow 0.3s ease;
}

.solution-card:hover {
    box-shadow: var(--shadow-sm);
}

.solution-card img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    border-bottom: 1px solid var(--border-color);
}

.s-content {
    padding: 32px;
}

.s-content h3 {
    font-size: 22px;
    margin-bottom: 16px;
    font-weight: 600;
}

.s-content p {
    font-size: 15px;
    color: var(--text-sub);
    line-height: 1.7;
}

/* Download Page */
.download-section {
    padding: 100px 0;
    background-color: var(--bg-light);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.download-card {
    background-color: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 48px 32px;
    text-align: center;
    transition: box-shadow 0.3s ease;
}

.download-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.d-icon {
    font-size: 64px;
    margin-bottom: 24px;
}

.download-card h3 {
    font-size: 24px;
    margin-bottom: 16px;
    font-weight: 600;
}

.download-card p {
    color: var(--text-sub);
    font-size: 15px;
    margin-bottom: 32px;
    min-height: 48px;
}

/* FAQ Section */
.faq-section {
    padding: 100px 0;
    background-color: var(--bg-light);
}

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

.faq-item {
    background-color: #fff;
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    transition: box-shadow 0.3s ease;
}

.faq-item:hover {
    box-shadow: var(--shadow-sm);
}

.faq-item h3 {
    font-size: 18px;
    margin-bottom: 16px;
    color: var(--text-main);
    font-weight: 600;
}

.faq-item p {
    font-size: 15px;
    color: var(--text-sub);
    line-height: 1.7;
}

/* CTA */
.cta-section {
    background-color: var(--bg-light);
    padding: 60px 0 100px;
}

.cta-container {
    background: linear-gradient(135deg, #0052D9 0%, #002B7A 100%);
    color: #fff;
    padding: 80px 40px;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.cta-container h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 20px;
}

.cta-container p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 40px;
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: 24px;
}

/* Footer */
.footer {
    background-color: #fff;
    padding: 80px 0 24px;
    border-top: 1px solid var(--border-color);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 60px;
}

.footer-brand p {
    margin-top: 16px;
    font-size: 14px;
    color: var(--text-sub);
    line-height: 1.8;
}

.footer-links h4 {
    font-size: 16px;
    margin-bottom: 24px;
    font-weight: 600;
    color: var(--text-main);
}

.footer-links a {
    display: block;
    color: var(--text-sub);
    font-size: 14px;
    margin-bottom: 16px;
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
    text-align: center;
    font-size: 13px;
    color: #86909C;
}

@media (max-width: 900px) {
    .data-grid, .features-grid, .solutions-grid, .download-grid, .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .nav-menu { display: none; }
    .hero-content h1 { font-size: 36px; }
    .hero-buttons, .cta-actions { flex-direction: column; }
    .hero-image-wrapper { transform: translateY(0); margin-top: 40px; }
    .hero-img { border-radius: 12px; border-bottom: 1px solid rgba(255,255,255,0.1); }
    .hero-gradient { padding-bottom: 60px; }
}