/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    color: #c8d6e5; background: #0a0e1a; line-height: 1.7; overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

/* ===== Navbar ===== */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    padding: 18px 0; transition: all 0.3s; background: transparent;
}
.navbar.scrolled {
    background: rgba(10,14,26,0.96); backdrop-filter: blur(12px);
    padding: 10px 0; box-shadow: 0 2px 24px rgba(0,0,0,0.3);
}
.nav-container { display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: 8px; font-size: 20px; font-weight: 700; color: #fff; }
.logo-img { width: 22px; height: 22px; }
.logo-sub { font-size: 13px; color: #4fc3f7; margin-left: 2px; font-weight: 400; }
.nav-links { display: flex; list-style: none; gap: 28px; }
.nav-links a { color: #8e99a4; font-size: 14px; transition: color 0.3s; }
.nav-links a:hover { color: #fff; }
.mobile-toggle { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 5px; }
.mobile-toggle span { display: block; width: 22px; height: 2px; background: #fff; transition: 0.3s; }

/* ===== Hero ===== */
.hero {
    position: relative; min-height: 80vh; display: flex; align-items: center;
    justify-content: center; padding: 80px 0 40px; overflow: hidden;
}
.hero-bg {
    position: absolute; inset: 0;
    background: radial-gradient(ellipse at 30% 20%, rgba(79,195,247,0.1) 0%, transparent 50%),
                radial-gradient(ellipse at 70% 80%, rgba(124,77,255,0.08) 0%, transparent 50%),
                linear-gradient(180deg, #0a0e1a 0%, #0d1525 100%);
}
.hero-bg::before {
    content: ''; position: absolute; inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%234fc3f7' fill-opacity='0.03'%3E%3Ccircle cx='1' cy='1' r='1'/%3E%3C/g%3E%3C/svg%3E");
}
.hero-content { position: relative; z-index: 1; text-align: center; max-width: 720px; margin: 0 auto; }
.hero-title {
    font-size: 52px; font-weight: 800; line-height: 1.2; margin-bottom: 20px;
    background: linear-gradient(135deg, #fff 0%, #4fc3f7 60%, #7c4dff 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-avatars { display: flex; justify-content: center; gap: 0; margin-bottom: 14px; }
.hero-avatars img {
    width: 40px; height: 40px; border-radius: 50%; border: 3px solid #0d1525;
    margin-left: -10px; object-fit: cover;
}
.hero-avatars img:first-child { margin-left: 0; }
.hero-desc { font-size: 16px; color: #8e99a4; margin-bottom: 32px; line-height: 1.8; }
.hero-buttons { display: flex; gap: 14px; justify-content: center; margin-bottom: 48px; flex-wrap: wrap; }
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 13px 28px; border-radius: 50px; font-size: 15px;
    font-weight: 600; transition: all 0.3s; cursor: pointer; border: none;
}
.btn-primary {
    background: linear-gradient(135deg, #4fc3f7, #7c4dff); color: #fff;
    box-shadow: 0 4px 20px rgba(79,195,247,0.25);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 28px rgba(79,195,247,0.4); }
.btn-secondary { background: rgba(255,255,255,0.06); color: #fff; border: 1px solid rgba(255,255,255,0.12); }
.btn-secondary:hover { background: rgba(255,255,255,0.12); transform: translateY(-2px); }
.btn-lg { padding: 15px 36px; font-size: 16px; }
.btn-sm { padding: 9px 20px; font-size: 13px; margin-top: 10px; }
.btn-icon { width: 16px; height: 16px; vertical-align: middle; }
.hero-stats { display: flex; gap: 48px; justify-content: center; flex-wrap: wrap; }
.stat-item { text-align: center; }
.stat-number {
    display: block; font-size: 28px; font-weight: 800;
    background: linear-gradient(135deg, #4fc3f7, #7c4dff);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.stat-label { font-size: 13px; color: #5a6a7a; }

/* ===== Section Common ===== */
.section-title { text-align: center; font-size: 32px; font-weight: 700; color: #fff; margin-bottom: 10px; }
.section-subtitle { text-align: center; font-size: 16px; color: #5a6a7a; margin-bottom: 48px; }

/* ===== About ===== */
.about { padding: 90px 0; background: #0d1525; }
.about-content { max-width: 800px; margin: 0 auto; }
.about-text p { font-size: 15px; color: #9aa8b8; margin-bottom: 18px; line-height: 1.9; }
.about-highlights { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 28px; }
.highlight-item { display: flex; align-items: center; gap: 10px; font-size: 14px; color: #b0bec5; }
.highlight-item i { color: #4fc3f7; font-size: 16px; flex-shrink: 0; }

/* ===== Features ===== */
.features { padding: 90px 0; }
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.feature-card {
    background: rgba(255,255,255,0.02); border: 1px solid rgba(255,255,255,0.05);
    border-radius: 14px; padding: 28px 20px; transition: all 0.3s;
}
.feature-card:hover {
    background: rgba(79,195,247,0.04); border-color: rgba(79,195,247,0.15);
    transform: translateY(-3px); box-shadow: 0 6px 24px rgba(79,195,247,0.08);
}
.feature-icon {
    width: 48px; height: 48px; border-radius: 12px;
    background: linear-gradient(135deg, rgba(79,195,247,0.12), rgba(124,77,255,0.12));
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 16px; font-size: 20px; color: #4fc3f7;
}
.feature-card h3 { font-size: 15px; color: #fff; margin-bottom: 8px; }
.feature-card p { font-size: 13px; color: #6b7d8e; line-height: 1.7; }

/* ===== Showcase ===== */
.showcase { padding: 90px 0; background: #0d1525; }
.showcase-desc { text-align: center; font-size: 15px; color: #6b7d8e; max-width: 680px; margin: 0 auto 36px; line-height: 1.8; }
.showcase-screenshot { display: flex; justify-content: center; }
.screenshot-img {
    max-width: 1000px; width: 100%; border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.4), 0 0 40px rgba(79,195,247,0.06);
    border: 1px solid rgba(255,255,255,0.04);
    margin-bottom: 24px;
}

/* ===== Why Us ===== */
.why-us { padding: 90px 0; }
.why-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.why-card {
    text-align: center; padding: 36px 20px;
    background: rgba(255,255,255,0.02); border: 1px solid rgba(255,255,255,0.05);
    border-radius: 14px; transition: all 0.3s;
}
.why-card:hover { background: rgba(79,195,247,0.04); border-color: rgba(79,195,247,0.15); transform: translateY(-3px); }
.why-icon { width: 48px; height: 48px; margin: 0 auto 16px; }
.why-card h3 { font-size: 16px; color: #fff; margin-bottom: 10px; }
.why-card p { font-size: 13px; color: #6b7d8e; line-height: 1.7; }

/* ===== Core Data ===== */
.core-data { padding: 80px 0; background: linear-gradient(135deg, rgba(79,195,247,0.05), rgba(124,77,255,0.05)); }
.data-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.data-item { padding: 20px; }
.data-number {
    display: block; font-size: 36px; font-weight: 800;
    background: linear-gradient(135deg, #4fc3f7, #7c4dff);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text; margin-bottom: 6px;
}
.data-label { font-size: 14px; color: #8e99a4; display: block; }
.data-desc { font-size: 12px; color: #4a5a6a; margin-top: 4px; }

/* ===== Reviews ===== */
.reviews { padding: 90px 0; background: #0d1525; }
.reviews-slider { display: flex; gap: 20px; overflow: hidden; }
.review-card {
    min-width: calc(33.333% - 14px);
    background: rgba(255,255,255,0.02); border: 1px solid rgba(255,255,255,0.05);
    border-radius: 14px; padding: 24px; transition: all 0.3s; flex-shrink: 0;
}
.review-card:hover { background: rgba(79,195,247,0.03); border-color: rgba(79,195,247,0.12); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.review-avatar { width: 42px; height: 42px; border-radius: 50%; object-fit: cover; border: 2px solid rgba(79,195,247,0.2); }
.review-author { font-size: 14px; font-weight: 600; color: #4fc3f7; }
.review-stars { color: #ffc107; font-size: 12px; }
.review-text { font-size: 13px; color: #8e99a4; line-height: 1.8; }
.slider-dots { display: flex; gap: 6px; justify-content: center; margin-top: 32px; }
.slider-dots .dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: rgba(255,255,255,0.12); cursor: pointer; transition: 0.3s;
}
.slider-dots .dot.active { background: #4fc3f7; box-shadow: 0 0 8px rgba(79,195,247,0.4); }

/* ===== Contact ===== */
.contact { padding: 90px 0; }
.contact-desc { text-align: center; font-size: 14px; color: #6b7d8e; margin-bottom: 40px; max-width: 560px; margin-left: auto; margin-right: auto; line-height: 1.7; }
.contact-grid-3 { display: flex; justify-content: center; gap: 24px; flex-wrap: nowrap; }
.contact-qr-card {
    background: rgba(255,255,255,0.02); border: 1px solid rgba(255,255,255,0.05);
    border-radius: 16px; padding: 20px; text-align: center; transition: all 0.3s;
    width: 300px; flex-shrink: 0;
}
.contact-qr-card:hover {
    background: rgba(79,195,247,0.04); border-color: rgba(79,195,247,0.15);
    transform: translateY(-3px); box-shadow: 0 6px 24px rgba(79,195,247,0.08);
}
.contact-qr-header { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; text-align: left; }
.contact-qr-icon-wrap {
    width: 40px; height: 40px; border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 18px; color: #fff; flex-shrink: 0;
}
.wechat-bg { background: #07c160; }
.qq-bg { background: #12b7f5; }
.tg-bg { background: #0088cc; }
.contact-qr-header h3 { font-size: 16px; color: #fff; margin: 0; }
.contact-id { font-size: 13px; color: #4fc3f7; margin: 2px 0 0; font-weight: 600; }
.qr-code-img {
    width: 264px; height: 264px; object-fit: contain; border-radius: 10px;
    margin: 0 auto 10px; border: 1px solid rgba(255,255,255,0.04);
    background: #fff;
}
.contact-hint { font-size: 12px; color: #4a5a6a; margin-bottom: 6px; }

/* ===== CTA ===== */
.cta-section { padding: 72px 0; text-align: center; background: linear-gradient(135deg, rgba(79,195,247,0.06), rgba(124,77,255,0.06)); }
.cta-section h2 { font-size: 28px; color: #fff; margin-bottom: 10px; }
.cta-section p { color: #6b7d8e; margin-bottom: 28px; font-size: 15px; }

/* ===== Footer ===== */
.footer { padding: 56px 0 20px; border-top: 1px solid rgba(255,255,255,0.04); background: #080b14; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 36px; margin-bottom: 36px; }
.footer-brand .logo { margin-bottom: 10px; }
.footer-tagline { color: #4fc3f7; font-size: 13px; margin-bottom: 8px; }
.footer-intro { color: #4a5a6a; font-size: 13px; line-height: 1.7; }
.footer-col h4 { font-size: 13px; color: #fff; margin-bottom: 14px; text-transform: uppercase; letter-spacing: 1px; }
.footer-col a, .footer-col p { display: block; color: #4a5a6a; font-size: 13px; margin-bottom: 8px; transition: color 0.3s; line-height: 1.6; }
.footer-col a:hover { color: #4fc3f7; }
.footer-col i { margin-right: 6px; width: 16px; text-align: center; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.04); padding-top: 18px; text-align: center; }
.footer-bottom p { color: #2d3a4a; font-size: 12px; }

/* ===== Animations ===== */
.fade-in { opacity: 0; transform: translateY(24px); transition: opacity 0.5s ease, transform 0.5s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .features-grid { grid-template-columns: repeat(3, 1fr); }
    .review-card { min-width: calc(50% - 10px); }
    .why-grid { grid-template-columns: repeat(2, 1fr); }
    .data-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
    .mobile-toggle { display: flex; }
    .nav-links {
        display: none; position: absolute; top: 100%; left: 0; right: 0;
        background: rgba(10,14,26,0.98); flex-direction: column;
        padding: 18px; gap: 14px; text-align: center;
    }
    .nav-links.active { display: flex; }
    .hero-title { font-size: 34px; }
    .hero-desc { font-size: 14px; }
    .hero-stats { gap: 28px; }
    .stat-number { font-size: 22px; }
    .section-title { font-size: 26px; }
    .features-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .feature-card { padding: 20px 16px; }
    .contact-grid-3 { gap: 12px; }
    .contact-qr-card { width: auto; padding: 14px 10px; }
    .qr-code-img { width: 168px; height: 168px; }
    .contact-qr-header { justify-content: center; }
    .review-card { min-width: 100%; }
    .why-grid { grid-template-columns: 1fr 1fr; }
    .about-highlights { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; text-align: center; }
    .contact-qr-header { justify-content: center; }
}
@media (max-width: 480px) {
    .hero-title { font-size: 28px; }
    .hero-buttons { flex-direction: column; align-items: center; }
    .features-grid { grid-template-columns: 1fr; }
    .why-grid { grid-template-columns: 1fr; }
    .data-grid { grid-template-columns: repeat(2, 1fr); }
    .qr-code-img { width: 120px; height: 120px; }
    .btn { padding: 11px 22px; font-size: 14px; }
}