/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: "PingFang SC", "Microsoft YaHei", "Inter", system-ui, -apple-system, sans-serif;
    color: #1F2937; background: #fff; line-height: 1.6; overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: color .3s; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }

/* === Typography === */
h1 { font-size: 48px; font-weight: 700; line-height: 1.2; }
h2 { font-size: 36px; font-weight: 600; line-height: 1.3; }
h3 { font-size: 24px; font-weight: 600; line-height: 1.4; }
h4 { font-size: 20px; font-weight: 600; }
p { font-size: 16px; line-height: 1.8; }
.text-sm { font-size: 14px; }
.text-center { text-align: center; }
.text-muted { color: #6B7280; }

/* === Layout === */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-light { background: #F7FAFC; }
.section-title { text-align: center; margin-bottom: 60px; }
.section-title h2 { margin-bottom: 16px; color: #1F2937; }
.section-title p { color: #6B7280; max-width: 600px; margin: 0 auto; }

/* === Navigation === */
.navbar {
    position: sticky; top: 0; z-index: 1000;
    background: rgba(255,255,255,.97); backdrop-filter: blur(10px);
    box-shadow: 0 1px 3px rgba(0,0,0,.08); padding: 0 20px;
}
.navbar .container {
    display: flex; align-items: center; justify-content: space-between;
    height: 70px; max-width: 1200px; margin: 0 auto;
}
.nav-logo { display: flex; align-items: center; gap: 10px; font-size: 22px; font-weight: 700; color: #2E7D32; }
.nav-logo .logo-icon { width: 36px; height: 36px; background: linear-gradient(135deg, #7EC86D, #2E7D32); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 18px; }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a { font-size: 15px; color: #4B5563; font-weight: 500; transition: color .3s; }
.nav-links a:hover, .nav-links a.active { color: #2E7D32; }
.nav-actions { display: flex; align-items: center; gap: 16px; }
.nav-actions .btn-login { font-size: 14px; color: #4B5563; padding: 8px 16px; border: 1px solid #D1D5DB; border-radius: 8px; }
.nav-actions .btn-login:hover { border-color: #7EC86D; color: #2E7D32; }
.nav-actions .btn-cta {
    font-size: 14px; color: #fff; padding: 8px 20px;
    background: linear-gradient(135deg, #7EC86D, #2E7D32);
    border-radius: 8px; font-weight: 600; transition: transform .3s, box-shadow .3s;
}
.nav-actions .btn-cta:hover { transform: scale(1.03); box-shadow: 0 4px 15px rgba(126,200,109,.4); }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.hamburger span { width: 24px; height: 2px; background: #1F2937; transition: .3s; }

/* === Hero === */
.hero {
    background: linear-gradient(135deg, #7EC86D 0%, #2E7D32 60%, #1B5E20 100%);
    padding: 100px 0 80px; color: #fff; position: relative; overflow: hidden;
}
.hero::before {
    content: ''; position: absolute; top: -50%; right: -20%; width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(255,255,255,.08) 0%, transparent 70%); border-radius: 50%;
}
.hero::after {
    content: ''; position: absolute; bottom: -30%; left: -10%; width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(255,255,255,.05) 0%, transparent 70%); border-radius: 50%;
}
.hero .container { display: flex; align-items: center; gap: 60px; position: relative; z-index: 1; }
.hero-text { flex: 1; }
.hero-text h1 { font-size: 48px; margin-bottom: 20px; line-height: 1.2; }
.hero-text .subtitle { font-size: 18px; opacity: .9; margin-bottom: 12px; line-height: 1.6; }
.hero-text .trust-line { font-size: 14px; opacity: .75; margin-bottom: 36px; }
.hero-buttons { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.btn-hero {
    display: inline-block; padding: 16px 40px; font-size: 18px; font-weight: 700;
    background: #fff; color: #2E7D32; border-radius: 12px;
    transition: transform .3s, box-shadow .3s;
}
.btn-hero:hover { transform: scale(1.03); box-shadow: 0 8px 30px rgba(0,0,0,.2); }
.btn-hero-outline {
    display: inline-block; padding: 16px 32px; font-size: 16px;
    border: 2px solid rgba(255,255,255,.5); color: #fff; border-radius: 12px;
    transition: background .3s, border-color .3s;
}
.btn-hero-outline:hover { background: rgba(255,255,255,.1); border-color: #fff; }
.hero-note { font-size: 13px; opacity: .7; margin-top: 12px; }
.hero-visual { flex: 1; display: flex; justify-content: center; }
.device-mockup {
    width: 100%; max-width: 480px; background: rgba(255,255,255,.1);
    border-radius: 20px; padding: 30px; backdrop-filter: blur(5px);
    border: 1px solid rgba(255,255,255,.15); text-align: center;
}
.device-mockup .screen {
    background: rgba(255,255,255,.12); border-radius: 12px; padding: 40px 20px;
    margin-bottom: 16px;
}
.device-mockup .screen .app-icon { width: 60px; height: 60px; background: linear-gradient(135deg, #7EC86D, #2E7D32); border-radius: 16px; margin: 0 auto 16px; display: flex; align-items: center; justify-content: center; font-size: 28px; }
.device-mockup .screen p { opacity: .8; font-size: 14px; }
.device-labels { display: flex; justify-content: center; gap: 20px; font-size: 13px; opacity: .7; }

/* === Advantage Cards === */
.advantages { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.adv-card {
    background: #fff; border-radius: 16px; padding: 32px 24px; text-align: center;
    box-shadow: 0 2px 12px rgba(0,0,0,.06); transition: transform .3s, box-shadow .3s;
    border: 1px solid #F0F0F0;
}
.adv-card:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(0,0,0,.1); }
.adv-icon {
    width: 64px; height: 64px; margin: 0 auto 20px;
    background: linear-gradient(135deg, rgba(126,200,109,.15), rgba(46,125,50,.1));
    border-radius: 16px; display: flex; align-items: center; justify-content: center;
    font-size: 28px; color: #2E7D32;
}
.adv-card h4 { margin-bottom: 10px; color: #1F2937; }
.adv-card p { font-size: 14px; color: #6B7280; line-height: 1.7; }

/* === Global Nodes Map === */
.map-section { background: #0F1B2D; color: #fff; padding: 80px 0; }
.map-container {
    width: 100%; max-width: 900px; margin: 0 auto 50px; position: relative;
    background: rgba(255,255,255,.03); border-radius: 20px; padding: 40px;
    border: 1px solid rgba(255,255,255,.08); min-height: 360px;
}
.world-map-svg { width: 100%; height: auto; }
.map-dot {
    position: absolute; width: 12px; height: 12px;
    background: #7EC86D; border-radius: 50%;
    box-shadow: 0 0 12px rgba(126,200,109,.6);
}
.map-dot::after {
    content: ''; position: absolute; top: -4px; left: -4px; width: 20px; height: 20px;
    border: 2px solid rgba(126,200,109,.4); border-radius: 50%;
}
.map-dot .dot-label {
    position: absolute; bottom: 100%; left: 50%; transform: translateX(-50%);
    white-space: nowrap; font-size: 12px; color: rgba(255,255,255,.8);
    margin-bottom: 6px; background: rgba(0,0,0,.5); padding: 2px 8px; border-radius: 4px;
}
.stats-bar { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-item h3 { font-size: 42px; font-weight: 700; color: #7EC86D; margin-bottom: 8px; }
.stat-item p { font-size: 14px; color: rgba(255,255,255,.7); }
.trust-tags { display: flex; justify-content: center; gap: 16px; margin-top: 40px; flex-wrap: wrap; }
.trust-tag {
    padding: 8px 20px; background: rgba(126,200,109,.1); border: 1px solid rgba(126,200,109,.3);
    border-radius: 20px; font-size: 14px; color: #7EC86D;
}

/* === Features Detail === */
.feature-row {
    display: flex; align-items: center; gap: 60px; margin-bottom: 80px;
}
.feature-row:nth-child(even) { flex-direction: row-reverse; }
.feature-row:last-child { margin-bottom: 0; }
.feature-img {
    flex: 1; background: linear-gradient(135deg, rgba(126,200,109,.08), rgba(46,125,50,.05));
    border-radius: 20px; padding: 40px; min-height: 280px;
    display: flex; align-items: center; justify-content: center;
    border: 1px solid #E8F5E9;
}
.feature-img .icon-large { font-size: 80px; opacity: .6; }
.feature-content { flex: 1; }
.feature-content h3 { margin-bottom: 16px; color: #1F2937; }
.feature-content p { color: #6B7280; margin-bottom: 12px; line-height: 1.8; }
.feature-tag {
    display: inline-block; padding: 4px 12px; background: rgba(126,200,109,.1);
    color: #2E7D32; border-radius: 6px; font-size: 13px; margin-right: 8px; margin-bottom: 8px;
}

/* === Security Section === */
.security-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.security-card {
    background: #fff; border-radius: 16px; padding: 32px;
    box-shadow: 0 2px 12px rgba(0,0,0,.06); border: 1px solid #F0F0F0;
}
.security-card h4 { margin-bottom: 12px; color: #1F2937; display: flex; align-items: center; gap: 10px; }
.security-card h4 .s-icon { color: #2E7D32; font-size: 22px; }
.security-card p { font-size: 14px; color: #6B7280; line-height: 1.8; }
.protocol-logos { display: flex; gap: 16px; margin-top: 16px; flex-wrap: wrap; }
.protocol-logo {
    padding: 6px 14px; background: #F7FAFC; border: 1px solid #E5E7EB;
    border-radius: 8px; font-size: 13px; color: #4B5563; font-weight: 500;
}

/* === Pricing === */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; align-items: start; }
.pricing-card {
    background: #fff; border-radius: 20px; padding: 36px 28px; text-align: center;
    box-shadow: 0 2px 16px rgba(0,0,0,.06); border: 2px solid #F0F0F0;
    transition: transform .3s, box-shadow .3s; position: relative;
}
.pricing-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,.1); }
.pricing-card.popular { border-color: #7EC86D; transform: scale(1.05); }
.pricing-card.popular:hover { transform: scale(1.05) translateY(-4px); }
.popular-badge {
    position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
    background: linear-gradient(135deg, #F59E0B, #D97706); color: #fff;
    padding: 4px 20px; border-radius: 20px; font-size: 13px; font-weight: 600;
    white-space: nowrap;
}
.pricing-card h3 { margin-bottom: 8px; font-size: 22px; }
.pricing-card .price { font-size: 42px; font-weight: 700; color: #2E7D32; margin: 16px 0; }
.pricing-card .price span { font-size: 16px; font-weight: 400; color: #6B7280; }
.pricing-card .price-note { font-size: 13px; color: #9CA3AF; margin-bottom: 24px; }
.pricing-features { text-align: left; margin-bottom: 28px; }
.pricing-features li { padding: 8px 0; font-size: 14px; color: #4B5563; display: flex; align-items: center; gap: 10px; }
.pricing-features li::before { content: '\2713'; color: #7EC86D; font-weight: 700; }
.btn-pricing {
    display: inline-block; width: 100%; padding: 14px 0; font-size: 16px; font-weight: 600;
    border-radius: 12px; transition: transform .3s, box-shadow .3s;
}
.btn-pricing-primary {
    background: linear-gradient(135deg, #7EC86D, #2E7D32); color: #fff;
}
.btn-pricing-primary:hover { transform: scale(1.03); box-shadow: 0 4px 15px rgba(126,200,109,.4); }
.btn-pricing-outline {
    border: 2px solid #7EC86D; color: #2E7D32;
}
.btn-pricing-outline:hover { background: rgba(126,200,109,.08); }
.pricing-guarantee { text-align: center; margin-top: 40px; padding: 20px; background: #F0FFF4; border-radius: 12px; }
.pricing-guarantee p { font-size: 14px; color: #2E7D32; }

/* === Testimonials === */
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.testimonial-card {
    background: #fff; border-radius: 16px; padding: 28px;
    box-shadow: 0 2px 12px rgba(0,0,0,.06); border: 1px solid #F0F0F0;
}
.testimonial-header { display: flex; align-items: center; gap: 14px; margin-bottom: 16px; }
.testimonial-avatar {
    width: 48px; height: 48px; border-radius: 50%;
    background: linear-gradient(135deg, #7EC86D, #2E7D32);
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-weight: 700; font-size: 18px;
}
.testimonial-info h4 { font-size: 15px; margin-bottom: 2px; }
.testimonial-info p { font-size: 13px; color: #9CA3AF; }
.testimonial-stars { color: #F59E0B; font-size: 14px; margin-bottom: 12px; }
.testimonial-card > p { font-size: 14px; color: #4B5563; line-height: 1.7; }
.awards-bar { display: flex; justify-content: center; gap: 32px; margin-top: 48px; flex-wrap: wrap; }
.award-badge {
    padding: 10px 24px; background: #F7FAFC; border: 1px solid #E5E7EB;
    border-radius: 10px; font-size: 14px; color: #4B5563; font-weight: 500;
}

/* === FAQ === */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-category { margin-bottom: 40px; }
.faq-category h3 { font-size: 20px; color: #2E7D32; margin-bottom: 20px; padding-bottom: 10px; border-bottom: 2px solid #E8F5E9; }
.faq-item { border: 1px solid #E5E7EB; border-radius: 12px; margin-bottom: 12px; overflow: hidden; }
.faq-question {
    display: block; padding: 18px 24px; font-size: 15px; font-weight: 600;
    color: #1F2937; background: #FAFAFA; transition: background .3s;
    cursor: pointer;
}
.faq-question:hover { background: #F0FFF4; }
.faq-answer { padding: 0 24px 20px; font-size: 14px; color: #4B5563; line-height: 1.8; }
.faq-answer .step { display: flex; gap: 12px; margin-bottom: 10px; }
.faq-answer .step-num {
    flex-shrink: 0; width: 24px; height: 24px; background: #7EC86D; color: #fff;
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    font-size: 12px; font-weight: 700; margin-top: 2px;
}
.faq-answer .step-text { flex: 1; }

/* === CTA Section === */
.cta-section {
    background: linear-gradient(135deg, #7EC86D 0%, #2E7D32 60%, #1B5E20 100%);
    padding: 80px 0; text-align: center; color: #fff; position: relative; overflow: hidden;
}
.cta-section::before {
    content: ''; position: absolute; top: -100px; right: -100px; width: 300px; height: 300px;
    background: radial-gradient(circle, rgba(255,255,255,.08), transparent 70%); border-radius: 50%;
}
.cta-section h2 { margin-bottom: 16px; font-size: 36px; }
.cta-section p { opacity: .85; margin-bottom: 36px; font-size: 18px; }
.btn-cta-large {
    display: inline-block; padding: 18px 48px; font-size: 20px; font-weight: 700;
    background: #fff; color: #2E7D32; border-radius: 14px;
    transition: transform .3s, box-shadow .3s;
}
.btn-cta-large:hover { transform: scale(1.03); box-shadow: 0 8px 30px rgba(0,0,0,.2); }
.download-badges { display: flex; justify-content: center; gap: 20px; margin-top: 32px; flex-wrap: wrap; }
.download-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 20px; background: rgba(255,255,255,.15); border: 1px solid rgba(255,255,255,.3);
    border-radius: 10px; color: #fff; font-size: 14px; transition: background .3s;
}
.download-badge:hover { background: rgba(255,255,255,.25); }
.download-badge .badge-icon { font-size: 20px; }

/* === Footer === */
.footer { background: #111827; color: #9CA3AF; padding: 60px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand h3 { color: #fff; margin-bottom: 12px; font-size: 20px; }
.footer-brand p { font-size: 14px; line-height: 1.7; }
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14px; color: #9CA3AF; padding: 4px 0; transition: color .3s; }
.footer-col a:hover { color: #7EC86D; }
.footer-bottom {
    border-top: 1px solid #1F2937; padding-top: 24px;
    display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px;
}
.footer-bottom p { font-size: 13px; }
.footer-social { display: flex; gap: 16px; }
.footer-social a {
    width: 36px; height: 36px; background: #1F2937; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 16px; color: #9CA3AF; transition: background .3s, color .3s;
}
.footer-social a:hover { background: #2E7D32; color: #fff; }

/* === Page Hero (sub pages) === */
.page-hero {
    background: linear-gradient(135deg, #7EC86D 0%, #2E7D32 100%);
    padding: 80px 0 60px; color: #fff; text-align: center;
}
.page-hero h1 { font-size: 40px; margin-bottom: 16px; }
.page-hero p { font-size: 18px; opacity: .85; max-width: 600px; margin: 0 auto; }
.breadcrumb { margin-top: 20px; font-size: 14px; opacity: .7; }
.breadcrumb a { color: #fff; opacity: .8; }
.breadcrumb a:hover { opacity: 1; }

/* === Help Page === */
.help-categories { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 60px; }
.help-cat-card {
    background: #fff; border-radius: 16px; padding: 28px; text-align: center;
    box-shadow: 0 2px 12px rgba(0,0,0,.06); border: 1px solid #F0F0F0;
    transition: transform .3s;
}
.help-cat-card:hover { transform: translateY(-4px); }
.help-cat-icon { font-size: 36px; margin-bottom: 12px; }
.help-cat-card h4 { margin-bottom: 8px; }
.help-cat-card p { font-size: 14px; color: #6B7280; }

/* === About Page === */
.about-content { max-width: 800px; margin: 0 auto; }
.about-content p { margin-bottom: 20px; font-size: 16px; line-height: 1.9; color: #4B5563; }
.team-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 40px; }
.team-card { text-align: center; padding: 24px; }
.team-avatar {
    width: 80px; height: 80px; border-radius: 50%; margin: 0 auto 16px;
    background: linear-gradient(135deg, #7EC86D, #2E7D32);
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-size: 32px; font-weight: 700;
}
.team-card h4 { margin-bottom: 4px; }
.team-card p { font-size: 14px; color: #6B7280; }
.values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 40px; }
.value-card {
    text-align: center; padding: 32px 24px;
    background: #fff; border-radius: 16px; box-shadow: 0 2px 12px rgba(0,0,0,.06);
}
.value-icon { font-size: 40px; margin-bottom: 16px; }
.value-card h4 { margin-bottom: 8px; }
.value-card p { font-size: 14px; color: #6B7280; }

/* === Nodes Page === */
.nodes-detail { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 40px; }
.node-region {
    background: #fff; border-radius: 16px; padding: 28px;
    box-shadow: 0 2px 12px rgba(0,0,0,.06); border: 1px solid #F0F0F0;
}
.node-region h4 { margin-bottom: 16px; color: #2E7D32; }
.node-city { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid #F3F4F6; font-size: 14px; }
.node-city:last-child { border-bottom: none; }
.node-city .latency { color: #7EC86D; font-weight: 600; }
.node-city .latency.medium { color: #F59E0B; }

/* === Responsive === */
@media (max-width: 992px) {
    h1 { font-size: 36px; }
    h2 { font-size: 28px; }
    .hero .container { flex-direction: column; text-align: center; }
    .hero-buttons { justify-content: center; }
    .advantages { grid-template-columns: repeat(2, 1fr); }
    .stats-bar { grid-template-columns: repeat(2, 1fr); }
    .feature-row, .feature-row:nth-child(even) { flex-direction: column; }
    .pricing-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
    .pricing-card.popular { transform: none; }
    .pricing-card.popular:hover { transform: translateY(-4px); }
    .testimonials-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .security-grid { grid-template-columns: 1fr; }
    .help-categories { grid-template-columns: 1fr; }
    .nodes-detail { grid-template-columns: 1fr; }
    .team-grid, .values-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .nav-links { display: none; }
    .hamburger { display: flex; }
    .section { padding: 60px 0; }
    .hero { padding: 60px 0 50px; }
    .hero-text h1 { font-size: 32px; }
    .advantages { grid-template-columns: 1fr; }
    .stats-bar { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .stat-item h3 { font-size: 32px; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 576px) {
    h1 { font-size: 28px; }
    .container { padding: 0 16px; }
    .hero-text h1 { font-size: 28px; }
    .btn-hero { padding: 14px 28px; font-size: 16px; }
    .download-badges { flex-direction: column; align-items: center; }
}