/* === 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: #e2e8f0;
    background: #0b1120;
    line-height: 1.7;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

/* === Utility === */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-title {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    color: #fff;
}
.section-subtitle {
    text-align: center;
    color: #94a3b8;
    font-size: 18px;
    margin-bottom: 56px;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}
.text-gradient {
    background: linear-gradient(135deg, #3b82f6, #06b6d4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* === Buttons === */
.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}
.btn-primary {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #fff;
    box-shadow: 0 4px 20px rgba(37, 99, 235, 0.4);
}
.btn-primary:hover {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    box-shadow: 0 6px 30px rgba(37, 99, 235, 0.6);
    transform: translateY(-2px);
}
.btn-outline {
    background: transparent;
    color: #93c5fd;
    border: 2px solid #3b82f6;
}
.btn-outline:hover {
    background: rgba(59, 130, 246, 0.1);
    transform: translateY(-2px);
}
.btn-sm { padding: 10px 24px; font-size: 14px; }
.btn-lg { padding: 18px 48px; font-size: 18px; }

/* === Header / Navigation === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(11, 17, 32, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(59, 130, 246, 0.1);
    transition: all 0.3s ease;
}
.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: #fff;
}
.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #2563eb, #06b6d4);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: #fff;
    font-weight: 800;
}
.nav { display: flex; align-items: center; gap: 8px; }
.nav a {
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 15px;
    color: #cbd5e1;
    transition: all 0.3s ease;
    font-weight: 500;
}
.nav a:hover, .nav a.active {
    color: #fff;
    background: rgba(59, 130, 246, 0.15);
}
.header-cta { margin-left: 16px; }
.mobile-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; }
.mobile-toggle span { width: 24px; height: 2px; background: #e2e8f0; border-radius: 2px; }

/* === Hero === */
.hero {
    padding: 160px 0 100px;
    text-align: center;
    position: relative;
    overflow: hidden;
    background: radial-gradient(ellipse at 50% 0%, rgba(37, 99, 235, 0.15) 0%, transparent 60%);
}
.hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%233b82f6' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}
.hero-content { position: relative; z-index: 1; }
.hero h1 {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    color: #fff;
}
.hero .subtitle {
    font-size: 20px;
    color: #94a3b8;
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 32px; }
.hero-trust {
    font-size: 14px;
    color: #64748b;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}
.hero-trust span { display: flex; align-items: center; gap: 6px; }

/* === Features Grid === */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.feature-card {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.8));
    border: 1px solid rgba(59, 130, 246, 0.1);
    border-radius: 16px;
    padding: 36px 28px;
    text-align: center;
    transition: all 0.3s ease;
}
.feature-card:hover {
    border-color: rgba(59, 130, 246, 0.3);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(37, 99, 235, 0.15);
}
.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.2), rgba(6, 182, 212, 0.2));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
}
.feature-card h3 { font-size: 20px; font-weight: 600; color: #fff; margin-bottom: 12px; }
.feature-card p { font-size: 15px; color: #94a3b8; line-height: 1.6; }

/* === Scenarios === */
.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}
.scenario-card {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.6), rgba(15, 23, 42, 0.6));
    border: 1px solid rgba(59, 130, 246, 0.08);
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.3s ease;
}
.scenario-card:hover {
    border-color: rgba(59, 130, 246, 0.25);
    transform: translateY(-4px);
}
.scenario-img {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(6, 182, 212, 0.05));
}
.scenario-body { padding: 28px; }
.scenario-body h3 { font-size: 22px; font-weight: 600; color: #fff; margin-bottom: 12px; }
.scenario-body p { font-size: 15px; color: #94a3b8; line-height: 1.7; }

/* === Stats === */
.stats-section {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(6, 182, 212, 0.05));
    border-top: 1px solid rgba(59, 130, 246, 0.1);
    border-bottom: 1px solid rgba(59, 130, 246, 0.1);
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    text-align: center;
}
.stat-item h3 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 8px;
}
.stat-item p { font-size: 16px; color: #94a3b8; }

/* === Download Section === */
.download-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.download-card {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.8));
    border: 1px solid rgba(59, 130, 246, 0.1);
    border-radius: 16px;
    padding: 40px 24px;
    text-align: center;
    transition: all 0.3s ease;
}
.download-card:hover {
    border-color: rgba(59, 130, 246, 0.3);
    transform: translateY(-4px);
}
.download-card .platform-icon { font-size: 48px; margin-bottom: 16px; }
.download-card h3 { font-size: 18px; font-weight: 600; color: #fff; margin-bottom: 8px; }
.download-card p { font-size: 14px; color: #64748b; margin-bottom: 20px; }

/* === Testimonials === */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.testimonial-card {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.6), rgba(15, 23, 42, 0.6));
    border: 1px solid rgba(59, 130, 246, 0.08);
    border-radius: 16px;
    padding: 32px;
}
.testimonial-stars { color: #fbbf24; font-size: 18px; margin-bottom: 16px; }
.testimonial-text { font-size: 15px; color: #cbd5e1; line-height: 1.7; margin-bottom: 20px; font-style: italic; }
.testimonial-author { font-size: 14px; color: #64748b; }
.testimonial-author strong { color: #94a3b8; }

/* === Pricing === */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    align-items: start;
}
.pricing-card {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.8));
    border: 1px solid rgba(59, 130, 246, 0.1);
    border-radius: 20px;
    padding: 40px 32px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
}
.pricing-card:hover {
    border-color: rgba(59, 130, 246, 0.3);
    transform: translateY(-4px);
}
.pricing-card.featured {
    border-color: #3b82f6;
    box-shadow: 0 0 40px rgba(37, 99, 235, 0.2);
}
.pricing-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #2563eb, #06b6d4);
    color: #fff;
    padding: 6px 20px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
}
.pricing-card h3 { font-size: 22px; font-weight: 600; color: #fff; margin-bottom: 8px; }
.pricing-card .price {
    font-size: 48px;
    font-weight: 800;
    color: #fff;
    margin: 20px 0 8px;
}
.pricing-card .price span { font-size: 16px; font-weight: 400; color: #94a3b8; }
.pricing-card .price-note { font-size: 14px; color: #64748b; margin-bottom: 28px; }
.pricing-features { text-align: left; margin-bottom: 32px; }
.pricing-features li {
    padding: 10px 0;
    font-size: 15px;
    color: #cbd5e1;
    border-bottom: 1px solid rgba(59, 130, 246, 0.06);
    display: flex;
    align-items: center;
    gap: 10px;
}
.pricing-features li::before { content: "\2713"; color: #3b82f6; font-weight: 700; }

/* === FAQ === */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.6), rgba(15, 23, 42, 0.6));
    border: 1px solid rgba(59, 130, 246, 0.08);
    border-radius: 12px;
    margin-bottom: 16px;
    overflow: hidden;
}
.faq-question {
    padding: 24px 28px;
    font-size: 17px;
    font-weight: 600;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 12px;
}
.faq-question .q-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, #2563eb, #06b6d4);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}
.faq-answer {
    padding: 0 28px 24px 72px;
    color: #94a3b8;
    font-size: 15px;
    line-height: 1.8;
}
.faq-answer ol { padding-left: 0; counter-reset: step; }
.faq-answer ol li {
    counter-increment: step;
    padding: 6px 0;
    position: relative;
    padding-left: 32px;
}
.faq-answer ol li::before {
    content: "Step " counter(step);
    position: absolute;
    left: 0;
    color: #3b82f6;
    font-weight: 600;
    font-size: 13px;
}

/* === About === */
.about-content { max-width: 800px; margin: 0 auto; }
.about-content p {
    font-size: 16px;
    color: #cbd5e1;
    line-height: 1.8;
    margin-bottom: 20px;
}
.timeline { max-width: 700px; margin: 40px auto 0; position: relative; padding-left: 40px; }
.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, #2563eb, #06b6d4);
}
.timeline-item { position: relative; margin-bottom: 36px; }
.timeline-item::before {
    content: '';
    position: absolute;
    left: -33px;
    top: 6px;
    width: 12px;
    height: 12px;
    background: #3b82f6;
    border-radius: 50%;
    border: 3px solid #0b1120;
}
.timeline-item h4 { font-size: 18px; color: #fff; margin-bottom: 6px; }
.timeline-item p { font-size: 15px; color: #94a3b8; }

/* === News === */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.news-card {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.6), rgba(15, 23, 42, 0.6));
    border: 1px solid rgba(59, 130, 246, 0.08);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
}
.news-card:hover {
    border-color: rgba(59, 130, 246, 0.25);
    transform: translateY(-4px);
}
.news-card-body { padding: 28px; }
.news-date { font-size: 13px; color: #64748b; margin-bottom: 10px; }
.news-card h3 { font-size: 18px; font-weight: 600; color: #fff; margin-bottom: 12px; }
.news-card p { font-size: 14px; color: #94a3b8; line-height: 1.6; }

/* === Privacy === */
.privacy-content { max-width: 800px; margin: 0 auto; }
.privacy-content h2 { font-size: 24px; color: #fff; margin: 36px 0 16px; font-weight: 600; }
.privacy-content p { font-size: 15px; color: #cbd5e1; line-height: 1.8; margin-bottom: 16px; }
.privacy-content ul { padding-left: 24px; margin-bottom: 16px; }
.privacy-content ul li { font-size: 15px; color: #cbd5e1; line-height: 1.8; padding: 4px 0; list-style: disc; }

/* === Footer === */
.footer {
    background: rgba(7, 11, 22, 0.95);
    border-top: 1px solid rgba(59, 130, 246, 0.08);
    padding: 60px 0 32px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-brand p { font-size: 14px; color: #64748b; margin-top: 16px; line-height: 1.7; }
.footer-col h4 { font-size: 15px; font-weight: 600; color: #fff; margin-bottom: 16px; }
.footer-col a {
    display: block;
    font-size: 14px;
    color: #64748b;
    padding: 5px 0;
    transition: color 0.3s ease;
}
.footer-col a:hover { color: #93c5fd; }
.footer-bottom {
    border-top: 1px solid rgba(59, 130, 246, 0.06);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}
.footer-bottom p { font-size: 13px; color: #475569; }
.footer-bottom a { color: #64748b; font-size: 13px; }
.footer-bottom a:hover { color: #93c5fd; }

/* === Page Header (for inner pages) === */
.page-header {
    padding: 140px 0 60px;
    text-align: center;
    background: radial-gradient(ellipse at 50% 0%, rgba(37, 99, 235, 0.12) 0%, transparent 60%);
}
.page-header h1 { font-size: 42px; font-weight: 800; color: #fff; margin-bottom: 16px; }
.page-header p { font-size: 18px; color: #94a3b8; max-width: 600px; margin: 0 auto; }

/* === Breadcrumb === */
.breadcrumb {
    padding: 12px 0;
    font-size: 14px;
    color: #64748b;
}
.breadcrumb a { color: #94a3b8; transition: color 0.3s; }
.breadcrumb a:hover { color: #93c5fd; }
.breadcrumb span { margin: 0 8px; }

/* === Product Detail === */
.product-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}
.product-detail-grid.reverse { direction: rtl; }
.product-detail-grid.reverse > * { direction: ltr; }
.product-detail-text h2 { font-size: 32px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.product-detail-text p { font-size: 16px; color: #94a3b8; line-height: 1.8; margin-bottom: 20px; }
.product-detail-visual {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(6, 182, 212, 0.05));
    border: 1px solid rgba(59, 130, 246, 0.1);
    border-radius: 20px;
    height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 80px;
}
.product-feature-list { margin-top: 20px; }
.product-feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 10px 0;
    font-size: 15px;
    color: #cbd5e1;
}
.product-feature-list li .check { color: #3b82f6; font-weight: 700; font-size: 18px; flex-shrink: 0; }

/* === Download Page === */
.download-platform-section { margin-bottom: 60px; }
.download-steps {
    max-width: 700px;
    margin: 0 auto;
    counter-reset: step;
}
.download-step {
    display: flex;
    gap: 20px;
    margin-bottom: 24px;
    align-items: flex-start;
}
.download-step-num {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #2563eb, #06b6d4);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}
.download-step-content h4 { font-size: 17px; color: #fff; margin-bottom: 6px; }
.download-step-content p { font-size: 14px; color: #94a3b8; }

/* === Help Categories === */
.help-categories {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}
.help-cat-card {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.6), rgba(15, 23, 42, 0.6));
    border: 1px solid rgba(59, 130, 246, 0.08);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: all 0.3s ease;
}
.help-cat-card:hover {
    border-color: rgba(59, 130, 246, 0.25);
    transform: translateY(-4px);
}
.help-cat-icon { font-size: 40px; margin-bottom: 16px; }
.help-cat-card h3 { font-size: 18px; font-weight: 600; color: #fff; margin-bottom: 8px; }
.help-cat-card p { font-size: 14px; color: #94a3b8; }

/* === CTA Section === */
.cta-section {
    text-align: center;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(6, 182, 212, 0.05));
    border-top: 1px solid rgba(59, 130, 246, 0.1);
    border-bottom: 1px solid rgba(59, 130, 246, 0.1);
}
.cta-section h2 { font-size: 36px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.cta-section p { font-size: 18px; color: #94a3b8; margin-bottom: 32px; max-width: 500px; margin-left: auto; margin-right: auto; }

/* === Responsive === */
@media (max-width: 1024px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
    .download-grid { grid-template-columns: repeat(2, 1fr); }
    .pricing-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .product-detail-grid { grid-template-columns: 1fr; gap: 32px; }
    .product-detail-grid.reverse { direction: ltr; }
    .news-grid { grid-template-columns: repeat(2, 1fr); }
    .help-categories { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .hero h1 { font-size: 36px; }
    .hero .subtitle { font-size: 17px; }
    .section-title { font-size: 28px; }
    .section { padding: 60px 0; }
    .nav { display: none; }
    .mobile-toggle { display: flex; }
    .header-cta { display: none; }
    .features-grid { grid-template-columns: 1fr; }
    .scenarios-grid { grid-template-columns: 1fr; }
    .download-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr; gap: 32px; }
    .stat-item h3 { font-size: 36px; }
    .pricing-grid { grid-template-columns: 1fr; max-width: 400px; margin-left: auto; margin-right: auto; }
    .testimonials-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .page-header h1 { font-size: 32px; }
    .news-grid { grid-template-columns: 1fr; }
    .help-categories { grid-template-columns: 1fr; }
    .hero-buttons { flex-direction: column; align-items: center; }
    .faq-answer { padding-left: 28px; }
}