/* 快连vpn Enterprise Flagship Style - Optimized */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

:root {
    --lv-primary: #0044FF;
    --lv-primary-deep: #0022AA;
    --lv-navy: #0A192F;
    --lv-slate: #475569;
    --lv-light-gray: #F8FAFC;
    --lv-white: #FFFFFF;
    --lv-border: #E2E8F0;
    --lv-success: #059669;
    --lv-accent: #00CCFF;
    --lv-gradient: linear-gradient(135deg, #0044FF 0%, #00CCFF 100%);
    --lv-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
    --lv-mesh-bg: radial-gradient(at 0% 0%, hsla(210,100%,98%,1) 0, transparent 50%), 
                  radial-gradient(at 50% 0%, hsla(215,100%,95%,1) 0, transparent 50%), 
                  radial-gradient(at 100% 0%, hsla(220,100%,92%,1) 0, transparent 50%);
}

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

html { scroll-behavior: smooth; }

/* Scroll Progress Bar */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 4px;
    background: var(--lv-gradient);
    z-index: 2000;
    transition: width 0.1s ease-out;
}

body {
    font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--lv-navy);
    background-color: var(--lv-white);
    background-image: var(--lv-mesh-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

a { text-decoration: none; color: inherit; transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); }

/* Navbar - Enterprise Clean Optimized */
.lv-nav {
    height: 80px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.nav-flex {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.lv-logo {
    font-size: 26px;
    font-weight: 900;
    color: var(--lv-primary);
    display: flex;
    align-items: center;
    gap: 12px;
}
.status-indicator {
    font-size: 12px;
    font-weight: 500;
    color: var(--lv-success);
    background: rgba(5, 150, 105, 0.1);
    padding: 4px 12px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: 10px;
}
.status-indicator .dot {
    width: 6px;
    height: 6px;
    background: var(--lv-success);
    border-radius: 50%;
    animation: blink 2s infinite;
}
@keyframes blink { 0% { opacity: 0.4; } 50% { opacity: 1; } 100% { opacity: 0.4; } }

.logo-icon {
    width: 40px; height: 40px;
    display: flex; align-items: center; justify-content: center;
    filter: drop-shadow(0 4px 8px rgba(0, 68, 255, 0.2));
}
.logo-icon svg { width: 100%; height: 100%; }

.nav-links { display: flex; gap: 40px; }
.nav-link { font-weight: 600; color: var(--lv-navy); font-size: 15px; opacity: 0.7; }
.nav-link:hover { color: var(--lv-primary); opacity: 1; transform: translateY(-1px); }

.nav-actions { display: flex; gap: 20px; align-items: center; }
.btn-lang { font-weight: 600; color: var(--lv-slate); font-size: 14px; cursor: pointer; }
.btn-dl-nav {
    background: var(--lv-primary);
    color: white;
    padding: 10px 24px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 14px;
    box-shadow: 0 4px 12px rgba(0, 68, 255, 0.2);
}
.btn-dl-nav:hover { background: var(--lv-primary-deep); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0, 68, 255, 0.25); }

/* Hero - Flagship Focus Optimized */
.lv-hero {
    padding: 140px 0 120px;
    background: radial-gradient(circle at top right, #F0F7FF 0%, #FFFFFF 60%);
    position: relative;
}
.hero-glow-bg {
    position: absolute;
    width: 800px; height: 800px;
    background: radial-gradient(circle, rgba(0, 68, 255, 0.05) 0%, transparent 70%);
    top: -200px; right: -200px;
    z-index: 0;
    pointer-events: none;
}

.hero-flex { display: flex; align-items: center; justify-content: space-between; position: relative; z-index: 1; }
.hero-txt { width: 600px; }
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 18px;
    background: rgba(0, 68, 255, 0.05);
    border: 1px solid rgba(0, 68, 255, 0.1);
    color: var(--lv-primary);
    border-radius: 50px;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 32px;
}
.hero-h1 {
    font-size: 72px;
    line-height: 1.05;
    margin-bottom: 28px;
    letter-spacing: -3px;
    font-weight: 900;
    color: var(--lv-navy);
}
.hero-p {
    font-size: 22px;
    color: var(--lv-slate);
    margin-bottom: 48px;
    line-height: 1.6;
}
.hero-btns { display: flex; gap: 20px; }
.btn-hero-pri {
    background: var(--lv-gradient);
    color: white;
    padding: 20px 52px;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 800;
    box-shadow: 0 20px 40px rgba(0, 68, 255, 0.2);
}
.btn-hero-pri:hover { transform: translateY(-3px); box-shadow: 0 25px 50px rgba(0, 68, 255, 0.3); }
.btn-hero-sec {
    background: white;
    border: 1px solid var(--lv-border);
    padding: 20px 52px;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 700;
    color: var(--lv-navy);
}
.btn-hero-sec:hover { border-color: var(--lv-primary); color: var(--lv-primary); background: var(--lv-light-gray); }

/* Hero Visual - High End Mockup Optimized */
.hero-vis {
    width: 550px; height: 500px;
    position: relative;
    perspective: 2000px;
}
.mockup-wrap {
    width: 100%; height: 100%;
    transform: rotateY(-15deg) rotateX(10deg);
    transform-style: preserve-3d;
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    animation: float 6s ease-in-out infinite;
}
@keyframes float {
    0% { transform: rotateY(-15deg) rotateX(10deg) translateY(0px); }
    50% { transform: rotateY(-15deg) rotateX(10deg) translateY(-20px); }
    100% { transform: rotateY(-15deg) rotateX(10deg) translateY(0px); }
}
.hero-vis:hover .mockup-wrap { animation-play-state: paused; transform: rotateY(-5deg) rotateX(5deg) translateY(-10px); }

.app-mockup {
    width: 320px; height: 500px;
    background: white;
    border-radius: 40px;
    border: 14px solid var(--lv-navy);
    box-shadow: 0 60px 120px rgba(0,0,0,0.2);
    overflow: hidden;
    position: relative;
    margin: 0 auto;
}
.app-screen { height: 100%; background: #F8FAFC; display: flex; flex-direction: column; align-items: center; padding-top: 80px; }
.connect-btn-sim {
    width: 160px; height: 160px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 15px 40px rgba(0,0,0,0.08);
    display: flex; align-items: center; justify-content: center;
    position: relative; margin-bottom: 50px;
    cursor: pointer;
    transition: 0.3s;
}
.connect-btn-sim:hover { transform: scale(1.05); }
.connect-btn-sim::after {
    content: ''; width: 120px; height: 120px;
    background: var(--lv-primary);
    border-radius: 50%;
    box-shadow: 0 0 30px rgba(0, 68, 255, 0.4);
    animation: pulse-ring 2s infinite;
}
@keyframes pulse-ring { 0% { transform: scale(0.95); opacity: 0.8; } 50% { transform: scale(1.05); opacity: 1; } 100% { transform: scale(0.95); opacity: 0.8; } }

.status-sim { font-weight: 900; font-size: 20px; color: var(--lv-navy); margin-bottom: 10px; }
.location-sim { font-size: 14px; color: var(--lv-slate); background: #EDF2F7; padding: 8px 20px; border-radius: 30px; font-weight: 600; }

/* Stats Strip Optimized */
.lv-stats { padding: 80px 0; border-bottom: 1px solid var(--lv-border); background: white; }
.stats-grid { display: flex; justify-content: space-around; }
.stat-item { text-align: left; border-left: 4px solid var(--lv-primary); padding-left: 24px; transition: 0.3s; }
.stat-item:hover { transform: translateX(5px); }
.stat-val { font-size: 44px; font-weight: 900; color: var(--lv-navy); line-height: 1; margin-bottom: 10px; letter-spacing: -1px; }
.stat-lbl { font-size: 16px; color: var(--lv-slate); font-weight: 600; }

/* Global Network Map Simulation Optimized */
.network-sec { padding: 120px 0; background: var(--lv-navy); color: white; text-align: center; position: relative; overflow: hidden; }
.network-sec::before {
    content: ''; position: absolute; inset: 0;
    background: url('https://www.transparenttextures.com/patterns/carbon-fibre.png');
    opacity: 0.05;
}
.map-vis {
    width: 100%; height: 450px;
    margin-top: 80px;
    background: radial-gradient(circle at center, rgba(0, 102, 255, 0.15) 0%, transparent 70%);
    position: relative;
}
.node {
    position: absolute; width: 10px; height: 10px; background: var(--lv-accent); border-radius: 50%;
    box-shadow: 0 0 20px var(--lv-accent);
    animation: ping 2.5s infinite;
}
@keyframes ping { 0% { transform: scale(1); opacity: 1; } 100% { transform: scale(4); opacity: 0; } }

/* Security Features Optimized */
.security-sec { padding: 140px 0; background: #050B1A; color: white; }
.sec-grid-wide { display: grid; grid-template-columns: repeat(2, 1fr); gap: 100px; align-items: center; }
.sec-list { list-style: none; padding: 0; margin-top: 50px; }
.sec-item { margin-bottom: 40px; display: flex; gap: 24px; transition: 0.3s; }
.sec-item:hover { transform: translateX(10px); }
.sec-icon-small {
    width: 56px; height: 56px; background: rgba(0, 102, 255, 0.15);
    border-radius: 16px; display: flex; align-items: center; justify-content: center;
    font-size: 24px; color: var(--lv-accent); flex-shrink: 0;
    border: 1px solid rgba(0, 102, 255, 0.2);
}
.sec-item-h3 { font-size: 22px; font-weight: 800; margin-bottom: 10px; }
.sec-item-p { font-size: 16px; color: #94A3B8; line-height: 1.7; }

.cert-badge-box {
    background: rgba(255,255,255,0.03); padding: 80px 60px; border-radius: 48px;
    border: 1px solid rgba(255,255,255,0.08); text-align: center;
    box-shadow: 0 40px 80px rgba(0,0,0,0.3);
}

/* Comparison Table Optimized */
.compare-sec { padding: 120px 0; background: var(--lv-light-gray); }
.compare-table { width: 100%; background: white; border-radius: 24px; overflow: hidden; box-shadow: var(--lv-shadow); }
.comp-row { display: grid; grid-template-columns: 2fr 1fr 1fr; padding: 30px 50px; border-bottom: 1px solid var(--lv-border); align-items: center; font-size: 17px; }
.comp-row:last-child { border-bottom: none; }
.comp-head { background: var(--lv-navy); color: white; font-weight: 800; border: none; padding: 35px 50px; font-size: 18px; }
.check-v { color: var(--lv-success); font-weight: 800; display: flex; align-items: center; gap: 8px; }
.cross-x { color: #EF4444; opacity: 0.6; font-weight: 600; }

/* Scenarios Section Optimized */
.scenario-sec { padding: 140px 0; background: white; }
.scenario-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
.scenario-card {
    position: relative; height: 350px; border-radius: 24px; overflow: hidden;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1); cursor: pointer;
}
.scenario-card::after {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(to top, rgba(10, 25, 47, 0.95) 0%, transparent 100%);
    opacity: 0.8; transition: 0.3s;
}
.scenario-card:hover { transform: translateY(-15px); }
.scenario-card:hover::after { opacity: 1; }
.scenario-content {
    position: absolute; bottom: 40px; left: 30px; right: 30px; z-index: 2;
    color: white; transform: translateY(10px); transition: 0.3s;
}
.scenario-card:hover .scenario-content { transform: translateY(0); }
.scenario-h3 { font-size: 24px; font-weight: 900; margin-bottom: 12px; }
.scenario-p { font-size: 15px; opacity: 0.8; line-height: 1.5; }

/* Regions Section Optimized */
.region-sec { padding: 120px 0; background: var(--lv-light-gray); text-align: center; }
.region-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 80px; }
.region-card {
    padding: 40px 30px; background: white; border-radius: 20px;
    text-align: left; transition: 0.4s; border: 1px solid var(--lv-border);
}
.region-card:hover { transform: translateY(-8px); box-shadow: 0 20px 40px rgba(0,0,0,0.06); border-color: var(--lv-primary); }
.region-flag { font-size: 32px; margin-bottom: 20px; display: block; }
.region-name { font-weight: 900; font-size: 20px; margin-bottom: 12px; display: block; color: var(--lv-navy); }
.region-latency { font-size: 14px; color: var(--lv-success); font-weight: 800; display: flex; align-items: center; gap: 8px; }
.region-latency::before { content: ''; width: 8px; height: 8px; background: var(--lv-success); border-radius: 50%; box-shadow: 0 0 10px var(--lv-success); }

/* Pricing Section Optimized */
.pricing-sec { padding: 140px 0; background: white; }
.pricing-grid { display: flex; justify-content: center; gap: 40px; align-items: stretch; }
.price-card {
    flex: 1; max-width: 380px; background: var(--lv-light-gray); padding: 60px 40px; border-radius: 32px;
    border: 1px solid var(--lv-border); text-align: center; transition: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex; flex-direction: column;
}
.price-card:hover { transform: translateY(-10px); box-shadow: var(--lv-shadow); }
.price-card.featured {
    background: var(--lv-navy); color: white; border: none; transform: scale(1.08);
    box-shadow: 0 40px 80px rgba(10, 25, 47, 0.25); z-index: 2;
}
.price-tag { font-size: 14px; font-weight: 900; text-transform: uppercase; margin-bottom: 25px; display: block; letter-spacing: 2px; color: var(--lv-primary); }
.price-card.featured .price-tag { color: var(--lv-accent); }
.price-val { font-size: 56px; font-weight: 950; margin-bottom: 40px; letter-spacing: -2px; }
.price-val span { font-size: 20px; opacity: 0.6; font-weight: 600; }
.price-features { list-style: none; padding: 0; margin-bottom: 50px; text-align: left; flex-grow: 1; }
.price-features li { margin-bottom: 20px; font-size: 16px; display: flex; align-items: center; gap: 12px; font-weight: 500; }
.check-icon { color: var(--lv-success); font-weight: 900; }
.btn-price {
    display: block; width: 100%; padding: 20px; border-radius: 16px; font-weight: 800;
    background: var(--lv-primary); color: white; font-size: 17px;
}
.price-card.featured .btn-price { background: var(--lv-accent); color: var(--lv-navy); }

/* Platform Section Optimized */
.platform-sec { padding: 140px 0; background: #0A192F; color: white; position: relative; overflow: hidden; }
.plat-detail-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 120px; align-items: center; }
.plat-item-rich {
    padding: 40px; background: rgba(255,255,255,0.04); border-radius: 24px;
    border: 1px solid rgba(255,255,255,0.08); margin-bottom: 24px;
    display: flex; gap: 24px; align-items: center; transition: 0.3s;
}
.plat-item-rich:hover { background: rgba(255,255,255,0.08); transform: scale(1.02); }
.plat-icon-circle {
    width: 64px; height: 64px; background: var(--lv-primary);
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    color: white; flex-shrink: 0; box-shadow: 0 10px 20px rgba(0, 68, 255, 0.3);
}
.plat-icon-circle svg {
    width: 32px;
    height: 32px;
}

/* Platform Visual Container */
.plat-vis-container {
    position: relative;
    width: 300px;
    height: 300px;
    margin: 0 auto;
}
.plat-main-icon {
    width: 240px;
    height: 240px;
    color: var(--lv-primary);
    filter: drop-shadow(0 20px 40px rgba(0, 68, 255, 0.2));
}
.plat-sub-icon {
    width: 100px;
    height: 100px;
    color: var(--lv-accent);
    position: absolute;
    bottom: 20px;
    right: 20px;
    background: white;
    padding: 10px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

/* Download Icons */
.plat-icon svg {
    width: 40px;
    height: 40px;
}

/* FAQ Section Optimized */
.faq-sec { padding: 140px 0; background: white; }
.faq-list { max-width: 900px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--lv-border); padding: 35px 0; cursor: pointer; transition: 0.3s; }
.faq-item:hover { border-color: var(--lv-primary); }
.faq-q { font-size: 22px; font-weight: 800; display: flex; justify-content: space-between; align-items: center; color: var(--lv-navy); }
.faq-q::after { content: '+'; font-size: 28px; color: var(--lv-primary); transition: 0.3s; }
.faq-a { margin-top: 25px; color: var(--lv-slate); line-height: 1.8; font-size: 17px; display: none; padding-right: 50px; }
.faq-item.active .faq-a { display: block; }
.faq-item.active .faq-q { color: var(--lv-primary); }
.faq-item.active .faq-q::after { transform: rotate(45deg); }

/* Footer Optimized */
.lv-footer { padding: 120px 0 60px; background: #020617; color: white; }
.ft-grid { display: grid; grid-template-columns: 2fr repeat(4, 1fr); gap: 60px; margin-bottom: 100px; }
.ft-brand h3 { color: white; font-size: 32px; margin-bottom: 28px; font-weight: 950; letter-spacing: -1px; }
.ft-brand p { color: #64748B; font-size: 16px; line-height: 1.8; max-width: 320px; }
.ft-col h4 { color: white; font-size: 17px; margin-bottom: 32px; font-weight: 800; }
.ft-col a { display: block; color: #94A3B8; margin-bottom: 18px; font-size: 15px; }
.ft-col a:hover { color: white; transform: translateX(5px); }
.ft-btm { border-top: 1px solid rgba(255,255,255,0.05); padding-top: 50px; display: flex; justify-content: space-between; align-items: center; color: #475569; font-size: 14px; }
.ft-socials { display: flex; gap: 30px; }
.ft-socials a:hover { color: white; }

/* Trust Bar Style */
.trust-bar {
    padding: 60px 0;
    background: #F1F5F9;
    border-top: 1px solid var(--lv-border);
    border-bottom: 1px solid var(--lv-border);
}
.trust-flex {
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-wrap: wrap;
    gap: 30px;
}
.trust-item {
    font-size: 18px;
    font-weight: 700;
    color: var(--lv-slate);
    display: flex;
    align-items: center;
    gap: 15px;
}
.trust-icon-svg {
    width: 32px;
    height: 32px;
    color: var(--lv-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}
.trust-icon-svg svg {
    width: 100%;
    height: 100%;
}

/* Back to Top Style */
.back-to-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 50px;
    height: 50px;
    background: var(--lv-primary);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(0, 68, 255, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 1000;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}
.back-to-top:hover {
    transform: translateY(-5px);
    background: var(--lv-primary-deep);
}

/* Responsive Adjustments */
@media (max-width: 1200px) {
    .container { width: 100%; }
    .hero-flex, .sec-grid-wide, .plat-detail-grid { flex-direction: column; text-align: center; gap: 60px; }
    .hero-txt { width: 100%; }
    .nav-links { display: none; }
    .pricing-grid { flex-direction: column; align-items: center; }
    .price-card { width: 100%; max-width: 450px; }
    .region-grid, .feat-grid, .scenario-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .region-grid, .feat-grid, .scenario-grid { grid-template-columns: 1fr; }
    .hero-h1 { font-size: 48px; }
    .ft-grid { grid-template-columns: 1fr 1fr; }
}