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

:root {
    --brand-primary: #1F74F2;
    --brand-highlight: #4FA3FF;
    --brand-text: #123A72;
    --brand-bg: #EEF5FF;
    --brand-bg-soft: #EAF4FF;
    --brand-page-top: #F7FBFF;
    --brand-gradient: linear-gradient(135deg, #4FA3FF 0%, #1F74F2 100%);
    --brand-page-gradient: linear-gradient(180deg, #F7FBFF 0%, #EEF5FF 100%);
    --brand-glow: rgba(79, 163, 255, 0.18);
    --text: #123A72;
    --text-light: #4a6fa5;
    --text-lighter: #7a9cc6;
    --bg: #ffffff;
    --border: #d4e4f7;
    --shadow-sm: 0 1px 3px rgba(18, 58, 114, 0.04);
    --shadow: 0 4px 24px rgba(31, 116, 242, 0.08);
    --shadow-lg: 0 20px 60px rgba(31, 116, 242, 0.12);
    --radius: 16px;
    --radius-sm: 10px;
}

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    background: var(--brand-page-gradient);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }

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

/* Navbar */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: rgba(247, 251, 255, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(212, 228, 247, 0.6);
    transition: box-shadow 0.2s ease;
}

.navbar.scrolled { box-shadow: var(--shadow-sm); }

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 18px;
}

.logo-icon { width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; }
.logo-icon svg { width: 100%; height: 100%; }

.logo-text {
    background: var(--brand-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: 0.5px;
}

.nav-links { display: flex; gap: 36px; }
.nav-links a { font-size: 15px; color: var(--text-light); font-weight: 500; transition: color 0.2s; }
.nav-links a:hover { color: var(--brand-primary); }
.nav-cta { display: flex; align-items: center; gap: 16px; }

/* Buttons */
.btn-primary, .btn-secondary, .btn-outline, .btn-text, .btn-text-light, .btn-download, .btn-download-light {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.btn-primary {
    background: var(--brand-gradient);
    color: white;
    box-shadow: 0 4px 14px rgba(31, 116, 242, 0.3);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 22px rgba(31, 116, 242, 0.4);
}

.btn-secondary {
    background: white;
    color: var(--text);
    border: 1.5px solid var(--border);
}
.btn-secondary:hover { border-color: var(--brand-primary); color: var(--brand-primary); }

.btn-outline {
    background: transparent;
    color: var(--text);
    border: 1.5px solid var(--border);
}
.btn-outline:hover { border-color: var(--brand-primary); color: var(--brand-primary); }

.btn-text { color: var(--text-light); padding: 10px 12px; }
.btn-text:hover { color: var(--brand-primary); }
.btn-text-light { color: white; padding: 10px 12px; opacity: 0.9; }
.btn-text-light:hover { opacity: 1; }

.btn-large { padding: 14px 28px; font-size: 15px; border-radius: 12px; }
.btn-block { width: 100%; }

/* Download Button - Hero Star */
.btn-download {
    background: var(--brand-gradient);
    color: white;
    padding: 18px 36px;
    border-radius: 14px;
    font-size: 16px;
    gap: 14px;
    box-shadow: 0 8px 32px rgba(31, 116, 242, 0.35), 0 0 0 1px rgba(79, 163, 255, 0.2);
    position: relative;
    overflow: hidden;
}
.btn-download::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 50%);
    pointer-events: none;
}
.btn-download:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(31, 116, 242, 0.45), 0 0 0 1px rgba(79, 163, 255, 0.3);
}
.btn-download .win-icon { flex-shrink: 0; }
.btn-download-text { display: flex; flex-direction: column; align-items: flex-start; gap: 2px; }
.btn-download-text strong { font-size: 16px; font-weight: 700; }
.btn-download-text small { font-size: 12px; opacity: 0.85; font-weight: 400; }

.btn-download-light {
    background: white;
    color: var(--brand-primary);
    padding: 16px 32px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 700;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}
.btn-download-light:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
}

/* Hero */
.hero {
    position: relative;
    padding: 160px 0 100px;
    overflow: hidden;
    text-align: center;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: -1;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.35;
    animation: float 14s ease-in-out infinite;
}

.orb-1 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, #4FA3FF, transparent 70%);
    top: -100px; left: -100px;
}
.orb-2 {
    width: 450px; height: 450px;
    background: radial-gradient(circle, #1F74F2, transparent 70%);
    top: 50px; right: -80px;
    animation-delay: -4s;
}
.orb-3 {
    width: 400px; height: 400px;
    background: radial-gradient(circle, #4FA3FF, transparent 70%);
    bottom: -150px; left: 40%;
    animation-delay: -8s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -40px) scale(1.05); }
    66% { transform: translate(-20px, 30px) scale(0.95); }
}

.hero-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 32px;
    box-shadow: var(--shadow-sm);
}

.hero-title {
    font-size: 60px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -1px;
    color: var(--brand-text);
}

.gradient-text {
    background: var(--brand-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-light);
    margin-bottom: 48px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.hero-trust {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-light);
    font-weight: 500;
}

.trust-item svg { color: var(--brand-primary); flex-shrink: 0; }

/* Section Common */
section { padding: 100px 0; }

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 64px;
}

.section-tag {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(31, 116, 242, 0.08);
    color: var(--brand-primary);
    font-size: 13px;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 20px;
}

.section-title {
    font-size: 38px;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
    color: var(--brand-text);
}

.section-desc {
    font-size: 17px;
    color: var(--text-light);
    line-height: 1.7;
}

/* Features */
.features { background: var(--brand-bg-soft); }

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px 28px;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: white;
}

.icon-blue { background: linear-gradient(135deg, #4FA3FF, #1F74F2); }
.icon-indigo { background: linear-gradient(135deg, #1F74F2, #123A72); }
.icon-cyan { background: linear-gradient(135deg, #4FA3FF, #06b6d4); }
.icon-navy { background: linear-gradient(135deg, #123A72, #1F74F2); }
.icon-sky { background: linear-gradient(135deg, #7ac4ff, #4FA3FF); }
.icon-light { background: linear-gradient(135deg, #4FA3FF, #a5d4ff); }

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--brand-text);
}

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

/* Security */
.security-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: auto auto;
    gap: 20px;
}

.security-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    transition: all 0.3s ease;
}

.security-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.security-card.security-main {
    grid-column: 1 / -1;
    background: var(--brand-gradient);
    color: white;
    border: none;
    display: flex;
    align-items: center;
    gap: 40px;
    padding: 48px;
}

.security-main .shield-icon {
    flex-shrink: 0;
    width: 100px;
    height: 100px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.security-main h3 { font-size: 24px; margin-bottom: 12px; }
.security-main p { opacity: 0.9; line-height: 1.7; margin-bottom: 16px; }

.security-list {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}
.security-list li {
    padding: 6px 14px;
    background: rgba(255,255,255,0.15);
    border-radius: 100px;
    font-size: 13px;
}

.security-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--brand-text);
}
.security-card p {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.7;
}
.security-main h3, .security-main p { color: white; }

/* Pricing */
.pricing { background: var(--brand-bg-soft); }

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 1080px;
    margin: 0 auto;
}

.price-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 40px 32px;
    position: relative;
    transition: all 0.3s ease;
}
.price-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }

.price-popular {
    border: 2px solid var(--brand-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-8px);
}

.price-badge {
    position: absolute;
    top: -12px; left: 50%;
    transform: translateX(-50%);
    padding: 4px 14px;
    background: var(--brand-gradient);
    color: white;
    font-size: 12px;
    font-weight: 600;
    border-radius: 100px;
}

.price-name { font-size: 16px; font-weight: 600; color: var(--text-light); margin-bottom: 16px; }
.price-amount { margin-bottom: 12px; display: flex; align-items: baseline; gap: 8px; }
.price-num { font-size: 40px; font-weight: 800; color: var(--brand-text); }
.price-unit { color: var(--text-light); font-size: 14px; }
.price-desc { color: var(--text-light); font-size: 14px; margin-bottom: 28px; }

.price-features { margin-bottom: 32px; }
.price-features li {
    padding: 10px 0;
    color: var(--text);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.price-features li::before {
    content: '';
    width: 18px; height: 18px;
    background: rgba(31, 116, 242, 0.1);
    border-radius: 50%;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%231F74F2' stroke-width='3' stroke-linecap='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    flex-shrink: 0;
}

/* CTA */
.cta { padding: 60px 0 100px; }

.cta-card {
    background: var(--brand-gradient);
    border-radius: 28px;
    padding: 80px 40px;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}
.cta-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.12), transparent 50%),
                radial-gradient(circle at 80% 70%, rgba(255,255,255,0.08), transparent 50%);
}
.cta-card > * { position: relative; }
.cta-card h2 { font-size: 36px; font-weight: 800; margin-bottom: 16px; }
.cta-card p { font-size: 17px; opacity: 0.92; margin-bottom: 36px; }

.cta-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

/* Footer */
.footer {
    background: #0a1e3d;
    color: #cbd5e1;
    padding: 80px 0 32px;
}

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

.footer-brand .logo { margin-bottom: 16px; color: white; }
.footer-desc { color: #64748b; font-size: 14px; line-height: 1.7; }

.footer-col h4 { color: white; font-size: 15px; font-weight: 600; margin-bottom: 20px; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col a { color: #94a3b8; font-size: 14px; transition: color 0.2s; }
.footer-col a:hover { color: white; }

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    display: flex;
    justify-content: space-between;
    color: #64748b;
    font-size: 13px;
    flex-wrap: wrap;
    gap: 12px;
}

/* Responsive */
@media (max-width: 960px) {
    .nav-links { display: none; }
    .hero-title { font-size: 44px; }
    .section-title { font-size: 30px; }
    .cta-card h2 { font-size: 28px; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .security-grid { grid-template-columns: 1fr 1fr; }
    .security-card.security-main { grid-column: 1 / -1; flex-direction: column; text-align: center; }
    .security-list { justify-content: center; }
    .pricing-grid { grid-template-columns: 1fr; max-width: 440px; }
    .price-popular { transform: none; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
    .hero { padding: 130px 0 60px; }
    .hero-title { font-size: 34px; }
    .hero-subtitle { font-size: 15px; }
    .hero-subtitle br { display: none; }
    .hero-trust { gap: 16px; }
    section { padding: 60px 0; }
    .section-title { font-size: 26px; }
    .features-grid { grid-template-columns: 1fr; }
    .security-grid { grid-template-columns: 1fr; }
    .security-card.security-main { padding: 32px; }
    .cta-card { padding: 50px 24px; }
    .cta-card h2 { font-size: 22px; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .btn-download { padding: 14px 24px; font-size: 14px; }
    .btn-download-text strong { font-size: 14px; }
}