/* === 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: #F8FAFC;
    line-height: 1.6;
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: color 0.2s; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* === Utility === */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section-title { font-size: 36px; font-weight: 700; text-align: center; margin-bottom: 16px; color: #0F172A; }
.section-subtitle { font-size: 18px; text-align: center; color: #64748B; margin-bottom: 48px; max-width: 600px; margin-left: auto; margin-right: auto; }
.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s;
    cursor: pointer;
    text-align: center;
}
.btn-primary { background: #2563EB; color: #fff; }
.btn-primary:hover { background: #1D4ED8; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.3); }
.btn-accent { background: #F59E0B; color: #fff; }
.btn-accent:hover { background: #D97706; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245,158,11,0.3); }
.btn-outline { border: 2px solid #2563EB; color: #2563EB; background: transparent; }
.btn-outline:hover { background: #2563EB; color: #fff; }
.btn-white { background: #fff; color: #2563EB; }
.btn-white:hover { background: #F0F7FF; transform: translateY(-2px); }

/* === Navigation === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    height: 72px;
    display: flex;
    align-items: center;
}
.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 700;
    color: #fff;
}
.nav-logo .logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, #3B82F6, #06B6D4);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #fff;
    font-weight: 800;
}
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a {
    color: #CBD5E1;
    font-size: 15px;
    font-weight: 500;
    transition: color 0.2s;
    position: relative;
    padding: 4px 0;
}
.nav-links a:hover, .nav-links a.active { color: #fff; }
.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: #3B82F6;
    border-radius: 1px;
}
.nav-cta .btn { padding: 10px 24px; font-size: 14px; }
.nav-mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}
.nav-mobile-toggle span {
    width: 24px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
}

/* === Hero === */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #0F172A 0%, #1E293B 50%, #0F172A 100%);
    overflow: hidden;
    padding-top: 72px;
}
.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(6,182,212,0.1) 0%, transparent 50%);
}
.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(59,130,246,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59,130,246,0.05) 1px, transparent 1px);
    background-size: 60px 60px;
}
.hero .container { position: relative; z-index: 2; text-align: center; }
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(59,130,246,0.15);
    border: 1px solid rgba(59,130,246,0.3);
    border-radius: 50px;
    padding: 8px 20px;
    font-size: 14px;
    color: #93C5FD;
    margin-bottom: 32px;
}
.hero h1 {
    font-size: 56px;
    font-weight: 800;
    color: #fff;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -1px;
}
.hero h1 .gradient-text {
    background: linear-gradient(135deg, #3B82F6, #06B6D4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle {
    font-size: 20px;
    color: #94A3B8;
    max-width: 640px;
    margin: 0 auto 40px;
    line-height: 1.7;
}
.hero-tags {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}
.hero-tag {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 50px;
    padding: 8px 18px;
    font-size: 14px;
    color: #CBD5E1;
}
.hero-buttons { display: flex; justify-content: center; gap: 16px; margin-bottom: 48px; flex-wrap: wrap; }
.hero-trust {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}
.trust-item { text-align: center; }
.trust-item .trust-number { font-size: 28px; font-weight: 700; color: #fff; }
.trust-item .trust-label { font-size: 13px; color: #64748B; margin-top: 4px; }

/* === Features Grid === */
.features-section { padding: 100px 0; }
.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.feature-card {
    background: #fff;
    border-radius: 16px;
    padding: 40px;
    border: 1px solid #E2E8F0;
    transition: all 0.3s;
}
.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    border-color: #3B82F6;
}
.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 20px;
}
.feature-icon.blue { background: rgba(37,99,235,0.1); }
.feature-icon.cyan { background: rgba(6,182,212,0.1); }
.feature-icon.amber { background: rgba(245,158,11,0.1); }
.feature-icon.green { background: rgba(16,185,129,0.1); }
.feature-card h3 { font-size: 22px; font-weight: 600; margin-bottom: 12px; color: #0F172A; }
.feature-card p { font-size: 15px; color: #64748B; line-height: 1.7; }

/* === Tech Section === */
.tech-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #0F172A, #1E293B);
    color: #fff;
}
.tech-section .section-title { color: #fff; }
.tech-section .section-subtitle { color: #94A3B8; }
.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.tech-card {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 16px;
    padding: 36px;
    transition: all 0.3s;
}
.tech-card:hover {
    background: rgba(255,255,255,0.08);
    border-color: rgba(59,130,246,0.4);
    transform: translateY(-4px);
}
.tech-card .tech-icon { font-size: 36px; margin-bottom: 16px; }
.tech-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 12px; }
.tech-card p { font-size: 14px; color: #94A3B8; line-height: 1.7; }

/* === Scenarios === */
.scenarios-section { padding: 100px 0; }
.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.scenario-card {
    background: #fff;
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
    border: 1px solid #E2E8F0;
    transition: all 0.3s;
}
.scenario-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 32px rgba(0,0,0,0.08);
}
.scenario-icon { font-size: 48px; margin-bottom: 16px; }
.scenario-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.scenario-card p { font-size: 14px; color: #64748B; line-height: 1.6; }

/* === Pricing === */
.pricing-section { padding: 100px 0; background: #F1F5F9; }
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    align-items: start;
}
.pricing-card {
    background: #fff;
    border-radius: 16px;
    padding: 36px 28px;
    border: 2px solid #E2E8F0;
    text-align: center;
    transition: all 0.3s;
    position: relative;
}
.pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 32px rgba(0,0,0,0.08);
}
.pricing-card.popular {
    border-color: #2563EB;
    box-shadow: 0 16px 40px rgba(37,99,235,0.15);
    transform: scale(1.03);
}
.pricing-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #2563EB, #06B6D4);
    color: #fff;
    padding: 4px 20px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
    white-space: nowrap;
}
.pricing-card h3 { font-size: 22px; font-weight: 600; margin-bottom: 8px; }
.pricing-period { font-size: 14px; color: #64748B; margin-bottom: 20px; }
.pricing-price { font-size: 42px; font-weight: 800; color: #0F172A; margin-bottom: 4px; }
.pricing-price span { font-size: 16px; font-weight: 400; color: #64748B; }
.pricing-desc { font-size: 14px; color: #64748B; margin-bottom: 24px; }
.pricing-features { text-align: left; margin-bottom: 28px; }
.pricing-features li {
    font-size: 14px;
    color: #475569;
    padding: 8px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}
.pricing-features li::before { content: '\2713'; color: #10B981; font-weight: 700; }
.pricing-card .btn { width: 100%; }

/* === Reviews === */
.reviews-section { padding: 100px 0; }
.reviews-stats {
    text-align: center;
    margin-bottom: 48px;
}
.reviews-score { font-size: 56px; font-weight: 800; color: #0F172A; }
.reviews-stars { font-size: 24px; color: #F59E0B; margin: 8px 0; }
.reviews-count { font-size: 16px; color: #64748B; }
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.review-card {
    background: #fff;
    border-radius: 16px;
    padding: 32px;
    border: 1px solid #E2E8F0;
}
.review-card .review-stars { color: #F59E0B; font-size: 16px; margin-bottom: 16px; }
.review-card .review-text { font-size: 15px; color: #475569; line-height: 1.7; margin-bottom: 20px; }
.review-card .review-author { font-size: 14px; font-weight: 600; color: #0F172A; }
.review-card .review-role { font-size: 13px; color: #94A3B8; }

/* === CTA Banner === */
.cta-banner {
    padding: 80px 0;
    background: linear-gradient(135deg, #2563EB, #06B6D4);
    text-align: center;
    color: #fff;
}
.cta-banner h2 { font-size: 36px; font-weight: 700; margin-bottom: 16px; }
.cta-banner p { font-size: 18px; opacity: 0.9; margin-bottom: 32px; }

/* === Footer === */
.footer {
    background: #0F172A;
    color: #94A3B8;
    padding: 60px 0 30px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-brand .footer-logo {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.footer-brand p { font-size: 14px; line-height: 1.7; max-width: 300px; }
.footer-col h4 { color: #fff; font-size: 16px; font-weight: 600; margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14px; color: #94A3B8; padding: 6px 0; transition: color 0.2s; }
.footer-col a:hover { color: #3B82F6; }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 13px;
}
.footer-warning {
    background: rgba(245,158,11,0.1);
    border: 1px solid rgba(245,158,11,0.3);
    border-radius: 8px;
    padding: 12px 20px;
    font-size: 13px;
    color: #FCD34D;
    text-align: center;
    margin-bottom: 24px;
}

/* === Page Header (for inner pages) === */
.page-header {
    padding: 140px 0 60px;
    background: linear-gradient(135deg, #0F172A, #1E293B);
    text-align: center;
    color: #fff;
}
.page-header h1 { font-size: 44px; font-weight: 800; margin-bottom: 16px; }
.page-header p { font-size: 18px; color: #94A3B8; max-width: 600px; margin: 0 auto; }

/* === Guide / FAQ === */
.guide-section { padding: 80px 0; }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
    background: #fff;
    border-radius: 12px;
    border: 1px solid #E2E8F0;
    margin-bottom: 20px;
    overflow: hidden;
}
.faq-question {
    padding: 24px 28px;
    font-size: 18px;
    font-weight: 600;
    color: #0F172A;
    background: #F8FAFC;
    border-bottom: 1px solid #E2E8F0;
    display: flex;
    align-items: center;
    gap: 12px;
}
.faq-question .faq-num {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, #2563EB, #06B6D4);
    color: #fff;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    flex-shrink: 0;
}
.faq-answer { padding: 24px 28px; }
.faq-step {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
    align-items: flex-start;
}
.faq-step:last-child { margin-bottom: 0; }
.step-num {
    width: 28px;
    height: 28px;
    background: #EFF6FF;
    color: #2563EB;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 2px;
}
.step-text { font-size: 15px; color: #475569; line-height: 1.7; }

/* === About === */
.about-content { padding: 80px 0; }
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}
.about-text h2 { font-size: 32px; font-weight: 700; margin-bottom: 20px; color: #0F172A; }
.about-text p { font-size: 16px; color: #475569; line-height: 1.8; margin-bottom: 16px; }
.about-visual {
    background: linear-gradient(135deg, #EFF6FF, #ECFEFF);
    border-radius: 20px;
    padding: 48px;
    text-align: center;
}
.about-visual .big-number { font-size: 72px; font-weight: 800; color: #2563EB; }
.about-visual .big-label { font-size: 18px; color: #64748B; margin-top: 8px; }
.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}
.value-card {
    background: #fff;
    border-radius: 16px;
    padding: 32px;
    border: 1px solid #E2E8F0;
    text-align: center;
}
.value-card .value-icon { font-size: 40px; margin-bottom: 16px; }
.value-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 8px; }
.value-card p { font-size: 14px; color: #64748B; line-height: 1.7; }

/* === Floating Widget === */
.floating-widget {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.floating-btn {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
    transition: all 0.3s;
}
.floating-btn:hover { transform: scale(1.1); }
.floating-btn.contact { background: #2563EB; color: #fff; }
.floating-btn.top { background: #fff; color: #2563EB; border: 1px solid #E2E8F0; }

/* === Responsive === */
@media (max-width: 1024px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .tech-grid { grid-template-columns: repeat(2, 1fr); }
    .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
    .pricing-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-mobile-toggle { display: flex; }
    .nav-cta { display: none; }
    .hero h1 { font-size: 36px; }
    .hero-subtitle { font-size: 16px; }
    .hero-trust { gap: 24px; }
    .section-title { font-size: 28px; }
    .features-grid { grid-template-columns: 1fr; }
    .tech-grid { grid-template-columns: 1fr; }
    .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
    .pricing-grid { grid-template-columns: 1fr; }
    .pricing-card.popular { transform: none; }
    .reviews-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .about-grid { grid-template-columns: 1fr; }
    .values-grid { grid-template-columns: 1fr; }
    .page-header h1 { font-size: 32px; }
    .hero-buttons { flex-direction: column; align-items: center; }
}
@media (max-width: 480px) {
    .hero h1 { font-size: 28px; }
    .scenarios-grid { grid-template-columns: 1fr; }
    .hero-tags { flex-direction: column; align-items: center; }
}