/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: #1E293B;
    background: #FFFFFF;
    line-height: 1.6;
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: color 0.3s; }
img { max-width: 100%; height: auto; }
ul { list-style: none; }

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

/* ===== Buttons ===== */
.btn-primary {
    display: inline-block;
    padding: 12px 32px;
    background: linear-gradient(135deg, #2563EB, #7C3AED);
    color: #fff;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
    border: none;
    cursor: pointer;
}
.btn-primary:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
    color: #fff;
}
.btn-secondary {
    display: inline-block;
    padding: 12px 32px;
    background: transparent;
    color: #2563EB;
    border: 2px solid #2563EB;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s;
    cursor: pointer;
}
.btn-secondary:hover {
    background: #2563EB;
    color: #fff;
}
.btn-accent {
    display: inline-block;
    padding: 14px 40px;
    background: #F59E0B;
    color: #fff;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 700;
    transition: transform 0.3s, box-shadow 0.3s;
    animation: pulse 2s infinite;
}
.btn-accent:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 24px rgba(245, 158, 11, 0.4);
    color: #fff;
}
@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.4); }
    50% { box-shadow: 0 0 0 12px rgba(245, 158, 11, 0); }
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    height: 72px;
}
.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: #2563EB;
}
.logo img { width: 36px; height: 36px; }
.nav-menu { display: flex; gap: 32px; }
.nav-menu a {
    font-size: 15px;
    font-weight: 500;
    color: #475569;
    transition: color 0.3s;
    padding: 8px 0;
    position: relative;
}
.nav-menu a:hover { color: #2563EB; }
.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #2563EB;
    transition: width 0.3s;
}
.nav-menu a:hover::after { width: 100%; }
.navbar .btn-primary { padding: 10px 24px; font-size: 14px; }

/* Mobile menu toggle */
.menu-toggle { display: none; font-size: 28px; color: #2563EB; cursor: pointer; }

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, #0F172A 0%, #1E293B 50%, #0F172A 100%);
    color: #fff;
    padding: 120px 24px 80px;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at 30% 50%, rgba(37, 99, 235, 0.15) 0%, transparent 50%),
                radial-gradient(ellipse at 70% 50%, rgba(124, 58, 237, 0.1) 0%, transparent 50%);
    animation: heroGlow 8s ease-in-out infinite alternate;
}
@keyframes heroGlow {
    0% { transform: translate(0, 0); }
    100% { transform: translate(-2%, 2%); }
}
.hero-content { position: relative; z-index: 1; max-width: 800px; }
.hero h1 {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #fff, #93C5FD);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}
.hero .subtitle {
    font-size: 20px;
    color: #94A3B8;
    margin-bottom: 16px;
    line-height: 1.6;
}
.hero .stats {
    font-size: 16px;
    color: #64748B;
    margin-bottom: 40px;
}
.hero .stats strong { color: #F59E0B; font-size: 20px; }
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-buttons .btn-secondary { color: #93C5FD; border-color: #93C5FD; }
.hero-buttons .btn-secondary:hover { background: #93C5FD; color: #0F172A; }

/* ===== Section Common ===== */
.section { padding: 100px 0; }
.section-dark { background: #0F172A; color: #fff; }
.section-light { background: #F8FAFC; }
.section-title {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
    color: #1E293B;
}
.section-dark .section-title { color: #fff; }
.section-desc {
    text-align: center;
    font-size: 18px;
    color: #64748B;
    max-width: 600px;
    margin: 0 auto 60px;
}
.section-dark .section-desc { color: #94A3B8; }

/* ===== Selling Points Cards ===== */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.card {
    background: #fff;
    border-radius: 12px;
    padding: 40px 24px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid #E2E8F0;
}
.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}
.card-icon {
    font-size: 48px;
    margin-bottom: 20px;
    display: block;
}
.card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: #1E293B;
}
.card p {
    font-size: 15px;
    color: #64748B;
    line-height: 1.6;
}

/* ===== Feature Blocks ===== */
.feature-block {
    display: flex;
    align-items: center;
    gap: 60px;
    margin-bottom: 80px;
}
.feature-block:nth-child(even) { flex-direction: row-reverse; }
.feature-block:last-child { margin-bottom: 0; }
.feature-img {
    flex: 1;
    min-width: 0;
}
.feature-img-placeholder {
    width: 100%;
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, #EFF6FF, #EDE9FE);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
}
.feature-text { flex: 1; min-width: 0; }
.feature-text h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 16px;
    color: #1E293B;
}
.feature-text p {
    font-size: 16px;
    color: #64748B;
    line-height: 1.8;
}

/* ===== Global Nodes ===== */
.nodes-map {
    text-align: center;
    padding: 40px 0;
}
.nodes-map-visual {
    width: 100%;
    max-width: 800px;
    margin: 0 auto 40px;
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, #0F172A, #1E293B);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}
.nodes-map-visual::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center, rgba(37, 99, 235, 0.2) 0%, transparent 70%);
}
.globe-icon { font-size: 120px; position: relative; z-index: 1; }
.nodes-list {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
}
.node-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: rgba(37, 99, 235, 0.1);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: 24px;
    font-size: 15px;
    color: #2563EB;
    transition: all 0.3s;
}
.node-tag:hover {
    background: rgba(37, 99, 235, 0.2);
    transform: translateY(-2px);
}
.node-dot {
    width: 8px;
    height: 8px;
    background: #2563EB;
    border-radius: 50%;
    animation: nodePulse 2s infinite;
}
@keyframes nodePulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}
.nodes-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 40px;
}
.stat-item { text-align: center; }
.stat-number {
    font-size: 48px;
    font-weight: 800;
    color: #2563EB;
    display: block;
}
.stat-label {
    font-size: 14px;
    color: #64748B;
    margin-top: 4px;
}

/* ===== Download Section ===== */
.download-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}
.download-card {
    background: #fff;
    border-radius: 12px;
    padding: 40px 24px;
    border: 1px solid #E2E8F0;
    transition: transform 0.3s, box-shadow 0.3s;
}
.download-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}
.download-card .platform-icon {
    font-size: 56px;
    margin-bottom: 16px;
    display: block;
}
.download-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
}
.download-card .version {
    font-size: 13px;
    color: #94A3B8;
    margin-bottom: 20px;
}

/* ===== Reviews ===== */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.review-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 32px;
}
.review-stars { color: #F59E0B; font-size: 18px; margin-bottom: 16px; }
.review-text {
    font-size: 15px;
    color: #CBD5E1;
    line-height: 1.8;
    margin-bottom: 20px;
    font-style: italic;
}
.review-author {
    font-size: 14px;
    color: #94A3B8;
    font-weight: 600;
}
.rating-badge {
    text-align: center;
    margin-bottom: 48px;
}
.rating-badge .score {
    font-size: 64px;
    font-weight: 800;
    color: #F59E0B;
}
.rating-badge .count {
    font-size: 16px;
    color: #94A3B8;
}

/* ===== Pricing ===== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    max-width: 900px;
    margin: 0 auto;
}
.pricing-card {
    background: #fff;
    border-radius: 16px;
    padding: 40px 32px;
    border: 2px solid #E2E8F0;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    position: relative;
}
.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}
.pricing-card.popular {
    border-color: #2563EB;
    box-shadow: 0 8px 32px rgba(37, 99, 235, 0.15);
}
.pricing-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #2563EB, #7C3AED);
    color: #fff;
    padding: 6px 24px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
}
.pricing-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 24px;
    color: #1E293B;
}
.pricing-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 24px;
}
.pricing-table th, .pricing-table td {
    padding: 12px 8px;
    text-align: center;
    border-bottom: 1px solid #F1F5F9;
    font-size: 14px;
}
.pricing-table th {
    font-weight: 600;
    color: #64748B;
    font-size: 13px;
}
.pricing-table td { color: #1E293B; }
.pricing-table .price {
    font-size: 18px;
    font-weight: 700;
    color: #2563EB;
}

/* ===== FAQ / Help ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-category {
    margin-bottom: 48px;
}
.faq-category h3 {
    font-size: 24px;
    font-weight: 700;
    color: #1E293B;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 2px solid #2563EB;
    display: inline-block;
}
.faq-item {
    background: #fff;
    border: 1px solid #E2E8F0;
    border-radius: 12px;
    padding: 24px 32px;
    margin-bottom: 16px;
}
.faq-item h4 {
    font-size: 18px;
    font-weight: 600;
    color: #1E293B;
    margin-bottom: 16px;
}
.faq-item h4::before {
    content: 'Q: ';
    color: #2563EB;
    font-weight: 700;
}
.faq-steps { padding-left: 0; }
.faq-steps li {
    position: relative;
    padding: 8px 0 8px 36px;
    font-size: 15px;
    color: #475569;
    line-height: 1.7;
    list-style: none;
}
.faq-steps li::before {
    content: attr(data-step);
    position: absolute;
    left: 0;
    top: 8px;
    width: 24px;
    height: 24px;
    background: #EFF6FF;
    color: #2563EB;
    border-radius: 50%;
    font-size: 12px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===== About ===== */
.about-content {
    max-width: 800px;
    margin: 0 auto;
}
.about-content p {
    font-size: 16px;
    color: #475569;
    line-height: 1.8;
    margin-bottom: 20px;
}
.about-values {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}
.value-card {
    text-align: center;
    padding: 32px 20px;
    background: #F8FAFC;
    border-radius: 12px;
}
.value-card .value-icon { font-size: 40px; margin-bottom: 16px; display: block; }
.value-card h4 { font-size: 18px; font-weight: 600; margin-bottom: 8px; color: #1E293B; }
.value-card p { font-size: 14px; color: #64748B; }

/* ===== Privacy ===== */
.privacy-content {
    max-width: 800px;
    margin: 0 auto;
}
.privacy-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: #1E293B;
    margin: 32px 0 12px;
}
.privacy-content p {
    font-size: 15px;
    color: #475569;
    line-height: 1.8;
    margin-bottom: 12px;
}
.privacy-content ul {
    padding-left: 24px;
    margin-bottom: 16px;
}
.privacy-content ul li {
    font-size: 15px;
    color: #475569;
    line-height: 1.8;
    list-style: disc;
    margin-bottom: 4px;
}

/* ===== CTA Section ===== */
.cta-section {
    background: linear-gradient(135deg, #2563EB, #7C3AED);
    padding: 80px 0;
    text-align: center;
    color: #fff;
}
.cta-section h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}
.cta-section p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 32px;
}

/* ===== Footer ===== */
.footer {
    background: #0F172A;
    color: #94A3B8;
    padding: 60px 0 30px;
}
.footer-content {
    display: flex;
    justify-content: space-between;
    gap: 40px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}
.footer-brand { max-width: 280px; }
.footer-brand .logo { color: #fff; margin-bottom: 12px; }
.footer-brand p { font-size: 14px; line-height: 1.6; }
.footer-links h4, .footer-contact h4 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 16px;
}
.footer-links ul { display: flex; flex-direction: column; gap: 10px; }
.footer-links a {
    font-size: 14px;
    color: #94A3B8;
    transition: color 0.3s;
}
.footer-links a:hover { color: #2563EB; }
.footer-contact p { font-size: 14px; margin-bottom: 8px; }
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    text-align: center;
    font-size: 13px;
}
.footer-bottom p { margin-bottom: 4px; }
.footer-warning {
    color: #F59E0B;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 8px;
}

/* ===== Page Header (for inner pages) ===== */
.page-header {
    background: linear-gradient(135deg, #0F172A, #1E293B);
    padding: 140px 0 80px;
    text-align: center;
    color: #fff;
}
.page-header h1 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 12px;
}
.page-header p {
    font-size: 18px;
    color: #94A3B8;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
    padding: 16px 0;
    font-size: 14px;
    color: #94A3B8;
}
.breadcrumb a { color: #2563EB; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span { margin: 0 8px; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .cards-grid { grid-template-columns: repeat(2, 1fr); }
    .download-grid { grid-template-columns: repeat(2, 1fr); }
    .reviews-grid { grid-template-columns: 1fr; }
    .pricing-grid { grid-template-columns: 1fr; }
    .feature-block { flex-direction: column !important; gap: 32px; }
    .about-values { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .nav-menu { display: none; }
    .menu-toggle { display: block; }
    .navbar .btn-primary { display: none; }
    .hero h1 { font-size: 36px; }
    .hero .subtitle { font-size: 16px; }
    .cards-grid { grid-template-columns: 1fr; }
    .download-grid { grid-template-columns: 1fr; }
    .section { padding: 60px 0; }
    .section-title { font-size: 28px; }
    .nodes-stats { flex-direction: column; gap: 24px; }
    .footer-content { flex-direction: column; }
    .page-header h1 { font-size: 32px; }
}