* { margin: 0; padding: 0; box-sizing: border-box; }
:root { --primary: #2f7cf6; --primary-dark: #1e5fd8; --text: #1f2937; --muted: #6b7280; --bg: #f8fafc; --border: #e5e7eb; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; color: var(--text); background: #fff; line-height: 1.7; }
a { color: var(--primary); text-decoration: none; }
img { max-width: 100%; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

.header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,.95); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.header .container { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; }
.logo-mark { width: 38px; height: 38px; border-radius: 10px; object-fit: cover; display: block; }
.logo-text h1 { font-size: 20px; line-height: 1.2; }
.tagline { font-size: 12px; color: var(--muted); }
.nav ul { display: flex; list-style: none; gap: 6px; }
.nav a { display: block; padding: 8px 14px; border-radius: 8px; color: var(--text); font-size: 15px; }
.nav a.active, .nav a:hover { color: var(--primary); background: #eff6ff; }
.nav-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--text); }

.hero { padding: 70px 0 60px; background: linear-gradient(180deg, #eff6ff 0%, #fff 100%); }
.hero .container { display: grid; grid-template-columns: 1.15fr 1fr; gap: 40px; align-items: center; }
.hero-badge { display: inline-block; background: #dbeafe; color: var(--primary-dark); font-size: 13px; font-weight: 600; padding: 5px 14px; border-radius: 999px; margin-bottom: 14px; }
.hero-title { font-size: 40px; font-weight: 800; line-height: 1.25; margin-bottom: 14px; }
.hero-subtitle { color: var(--muted); font-size: 17px; margin-bottom: 24px; }
.hero-buttons { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 30px; }
.btn { display: inline-block; padding: 13px 30px; border-radius: 10px; font-size: 16px; font-weight: 600; transition: all .3s; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(47,124,246,.35); }
.btn-secondary { background: #fff; color: var(--primary); border: 1px solid var(--primary); }
.btn-secondary:hover { background: #eff6ff; }
.btn-sm { padding: 9px 18px; font-size: 14px; }
.hero-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.stat-item { text-align: center; background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 12px 4px; }
.stat-number { display: block; font-size: 22px; font-weight: 800; color: var(--primary); }
.stat-label { font-size: 12px; color: var(--muted); }

.send-demo { background: #1e293b; border-radius: 16px; overflow: hidden; box-shadow: 0 20px 50px rgba(30,41,59,.35); }
.send-titlebar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; background: #0f172a; }
.app-dot { width: 11px; height: 11px; border-radius: 50%; }
.app-dot.red { background: #f87171; } .app-dot.yellow { background: #fbbf24; } .app-dot.green { background: #34d399; }
.send-name { color: #cbd5e1; font-size: 13px; margin-left: 8px; }
.send-body { padding: 20px; }
.send-row { display: flex; align-items: center; gap: 12px; background: #334155; border-radius: 10px; padding: 10px 14px; margin-bottom: 10px; color: #e2e8f0; }
.device-icon { font-size: 22px; }
.send-row small { display: block; color: #94a3b8; font-size: 11px; }
.send-row div { flex: 1; }
.status { font-size: 11px; padding: 2px 9px; border-radius: 999px; }
.status.ok { background: #064e3b; color: #34d399; }
.send-file { color: #93c5fd; font-size: 14px; margin: 14px 0 8px; }
.send-progress { height: 8px; border-radius: 999px; background: #334155; overflow: hidden; }
.send-bar { width: 62%; height: 100%; background: linear-gradient(90deg, #2f7cf6, #22c1dc); border-radius: 999px; animation: grow 2.4s ease-in-out infinite alternate; }
@keyframes grow { from { width: 42%; } to { width: 86%; } }
.send-tip { color: #94a3b8; font-size: 12px; margin-top: 10px; }

section { padding: 64px 0; }
.section-title { text-align: center; font-size: 30px; font-weight: 800; margin-bottom: 10px; }
.section-subtitle { text-align: center; color: var(--muted); margin-bottom: 40px; }
.version-section { background: var(--bg); }
.changelog { list-style: none; max-width: 800px; margin: 0 auto; background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 24px 28px; }
.changelog li { padding: 7px 0; border-bottom: 1px dashed var(--border); font-size: 15px; }
.changelog li:last-child { border-bottom: none; }
.changelog code { background: #eff6ff; color: var(--primary-dark); padding: 1px 7px; border-radius: 5px; font-size: 13px; }

.download-section { background: #fff; }
.platform-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 18px; }
.platform-card { text-align: center; border: 1px solid var(--border); border-radius: 14px; padding: 26px 16px; transition: all .3s; }
.platform-card:hover { transform: translateY(-4px); box-shadow: 0 12px 28px rgba(0,0,0,.08); border-color: var(--primary); }
.platform-icon { font-size: 40px; margin-bottom: 8px; }
.platform-card h3 { font-size: 19px; margin-bottom: 6px; }
.platform-card p { color: var(--muted); font-size: 13px; min-height: 60px; margin-bottom: 12px; }
.download-note { text-align: center; color: var(--muted); font-size: 14px; margin-top: 28px; }

.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card { background: var(--bg); border: 1px solid var(--border); border-radius: 14px; padding: 26px; }
.feature-icon { font-size: 34px; margin-bottom: 10px; }
.feature-card h3 { font-size: 18px; margin-bottom: 8px; }
.feature-card p { color: var(--muted); font-size: 14px; }

.how-section { background: var(--bg); }
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.step-card { background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 28px; text-align: center; }
.step-num { display: inline-flex; width: 42px; height: 42px; border-radius: 50%; background: var(--primary); color: #fff; font-size: 20px; font-weight: 700; align-items: center; justify-content: center; margin-bottom: 12px; }
.step-card h3 { margin-bottom: 8px; }
.step-card p { color: var(--muted); font-size: 14px; }

.scenes-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.scene-item { background: #eff6ff; color: var(--primary-dark); border-radius: 10px; padding: 14px 18px; font-size: 15px; font-weight: 500; }

.faq-list { max-width: 800px; margin: 0 auto; }
details { background: var(--bg); border: 1px solid var(--border); border-radius: 10px; margin-bottom: 10px; }
summary { padding: 15px 20px; font-weight: 600; cursor: pointer; }
details p { padding: 0 20px 15px; color: var(--muted); font-size: 15px; }

.seo-section { background: var(--bg); }
.seo-text { color: var(--muted); font-size: 14px; line-height: 2; text-align: center; }

.disclaimer-section { padding-top: 24px; }
.disclaimer-box { max-width: 800px; margin: 0 auto; background: #fffbeb; border: 1px solid #fde68a; border-radius: 12px; padding: 22px 26px; color: #92400e; font-size: 14px; }
.disclaimer-box p { margin-bottom: 8px; }
.disclaimer-box p:last-child { margin-bottom: 0; }

.footer { background: #1e293b; color: #94a3b8; text-align: center; padding: 30px 20px; font-size: 13px; }
.footer a { color: #93c5fd; }
.footer p { margin-bottom: 6px; }

.version-header { text-align: center; margin-bottom: 30px; }
.version-number { font-size: 44px; font-weight: 800; color: var(--primary); margin-bottom: 6px; }
.version-date { color: var(--muted); margin-bottom: 18px; }
.download-table { width: 100%; border-collapse: collapse; margin: 24px 0; background: #fff; border-radius: 10px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,.08); }
.download-table th, .download-table td { padding: 13px 14px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; white-space: nowrap; }
.download-table th { background: var(--bg); font-weight: 600; }
.download-table tr:hover { background: #f0f7ff; }
.table-wrapper { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.download-link { display: inline-block; padding: 8px 20px; background: var(--primary); color: #fff; border-radius: 6px; font-size: 13px; font-weight: 600; }
.pwd-code { background: #eff6ff; color: var(--primary-dark); padding: 3px 10px; border-radius: 5px; font-size: 13px; font-weight: 600; }
.platform-badge { display: inline-block; padding: 3px 9px; border-radius: 4px; font-size: 12px; font-weight: 600; }
.platform-badge.install { background: #dcfce7; color: #166534; }
.platform-badge.portable { background: #fce7f3; color: #9f1239; }

@media (max-width: 860px) {
    .hero .container { grid-template-columns: 1fr; gap: 30px; }
    .hero-title { font-size: 30px; }
    .features-grid, .steps-grid, .scenes-grid { grid-template-columns: 1fr 1fr; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
    .nav { position: absolute; top: 64px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); display: none; }
    .nav.open { display: block; }
    .nav ul { flex-direction: column; padding: 10px 16px; }
    .nav-toggle { display: block; }
    .hero { padding: 44px 0 40px; }
    .hero-title { font-size: 26px; }
    .hero-subtitle { font-size: 15px; }
    section { padding: 46px 0; }
    .section-title { font-size: 24px; }
    .features-grid, .steps-grid, .scenes-grid { grid-template-columns: 1fr; }
    .btn { width: 100%; text-align: center; }
    .hero-buttons { flex-direction: column; }
    .version-number { font-size: 34px; }
}