:root {
    --bg-color: #080A12;
    --card-bg: rgba(255, 255, 255, 0.03);
    --card-border: rgba(255, 255, 255, 0.06);
    --accent-primary: #8A2BE2;
    --accent-secondary: #00F2FE;
    --accent-gradient: linear-gradient(135deg, #8A2BE2 0%, #4A00E0 50%, #00F2FE 100%);
    --text-primary: #FFFFFF;
    --text-secondary: rgba(255, 255, 255, 0.6);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color); color: var(--text-primary);
    overflow-x: hidden; line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
.ambient-bg {
    position: fixed; inset: 0; width: 100%; height: 100%; z-index: -1; overflow: hidden;
    background: radial-gradient(circle at 10% 15%, rgba(138, 43, 226, 0.18) 0%, transparent 42%),
                radial-gradient(circle at 90% 85%, rgba(0, 242, 254, 0.14) 0%, transparent 42%),
                #080A12;
}
.ambient-grid {
    position: absolute; width: 100%; height: 100%;
    background-image: linear-gradient(rgba(255,255,255,0.012) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(255,255,255,0.012) 1px, transparent 1px);
    background-size: 50px 50px; background-position: center;
    mask-image: radial-gradient(circle at center, black, transparent 80%);
    -webkit-mask-image: radial-gradient(circle at center, black, transparent 80%);
}
.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }

header.site-header { padding: 22px 0; display: flex; justify-content: space-between; align-items: center; position: relative; z-index: 10; gap: 16px; }
.logo { font-size: 24px; font-weight: 800;
    background: linear-gradient(to right, #FFFFFF, var(--accent-secondary));
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
    display: flex; align-items: center; gap: 8px; }
.logo-icon { width: 32px; height: 32px; background: var(--accent-gradient); border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 18px; color: #FFF; -webkit-text-fill-color: #fff; }
.logo-mark { display: flex; flex-direction: column; line-height: 1.15; }
.logo-sub { font-size: 11px; font-weight: 600; letter-spacing: 0.04em; opacity: 0.7; -webkit-text-fill-color: rgba(255,255,255,0.65); background: none; }
.nav-links { display: flex; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
.nav-links a { color: var(--text-secondary); margin-left: 22px; font-size: 14px; font-weight: 500; transition: color 0.3s cubic-bezier(0.25, 0.8, 0.25, 1); }
.nav-links a:hover { color: var(--text-primary); }
.nav-btn { background: rgba(255,255,255,0.05); border: 1px solid var(--card-border); padding: 9px 20px; border-radius: 999px; color: #FFF !important; backdrop-filter: blur(8px); transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1); }
.nav-btn:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.3); transform: translateY(-1px); }
.nav-btn.cta { background: var(--accent-gradient); border: none; box-shadow: 0 6px 20px rgba(138,43,226,.35); }

.hero { padding: 90px 0 40px 0; text-align: center; position: relative; z-index: 2; }
.tagline { display: inline-flex; align-items: center; gap: 8px; background: rgba(138,43,226,0.12); border: 1px solid rgba(138,43,226,0.25); padding: 6px 16px; border-radius: 999px; font-size: 13px; font-weight: 600; color: var(--accent-secondary); margin-bottom: 26px; backdrop-filter: blur(4px); }
.hero h1 { font-size: 62px; font-weight: 900; line-height: 1.12; letter-spacing: -1.5px; margin-bottom: 22px; }
.gradient-text { background: var(--accent-gradient); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero p.subtitle { font-size: 19px; color: var(--text-secondary); max-width: 680px; margin: 0 auto 36px auto; }

.cta-group { display: flex; justify-content: center; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }
.btn-primary { background: var(--accent-gradient); color: #FFF; padding: 16px 38px; border-radius: 999px; font-weight: 700; font-size: 16px; box-shadow: 0 8px 30px rgba(138,43,226,0.35); transition: all 0.3s cubic-bezier(0.25,0.8,0.25,1); border: none; cursor: pointer; display: inline-flex; align-items: center; gap: 10px; }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 15px 38px rgba(138,43,226,0.5), 0 0 15px rgba(0,242,254,0.3); }
.btn-secondary { background: rgba(255,255,255,0.05); border: 1px solid var(--card-border); color: #FFF; padding: 16px 38px; border-radius: 999px; font-weight: 600; font-size: 16px; backdrop-filter: blur(8px); transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1); cursor: pointer; display: inline-flex; align-items: center; gap: 10px; }
.btn-secondary:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.2); transform: translateY(-2px); }
.cta-note { font-size: 13px; color: var(--text-secondary); margin-bottom: 54px; }

.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; max-width: 900px; margin: 0 auto 90px auto; }
.stat { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 16px; padding: 22px 14px; backdrop-filter: blur(10px); }
.stat .num { font-size: 30px; font-weight: 800; background: var(--accent-gradient); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.stat .lbl { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }

.section { padding: 40px 0 60px 0; position: relative; z-index: 2; }
.section-head { text-align: center; margin-bottom: 48px; }
.section-head .eyebrow { color: var(--accent-secondary); font-weight: 700; font-size: 13px; letter-spacing: 1px; text-transform: uppercase; }
.section-head h2 { font-size: 40px; font-weight: 800; letter-spacing: -1px; margin: 10px 0 8px; }
.section-head p { color: var(--text-secondary); max-width: 620px; margin: 0 auto; font-size: 16px; }

.pain-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px,1fr)); gap: 20px; }
.pain { background: rgba(248,113,113,0.04); border: 1px solid rgba(248,113,113,0.14); border-radius: 16px; padding: 24px; }
.pain .x { color: #f87171; font-weight: 700; font-size: 14px; }
.pain h3 { font-size: 16px; margin: 8px 0 6px; font-weight: 700; }
.pain p { color: var(--text-secondary); font-size: 14px; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(330px, 1fr)); gap: 22px; }
.feature-card { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 20px; padding: 30px; backdrop-filter: blur(12px); transition: all 0.3s cubic-bezier(0.25,0.8,0.25,1); text-align: left; }
.feature-card:hover { transform: translateY(-5px); border-color: rgba(0,242,254,0.22); background: rgba(255,255,255,0.05); box-shadow: 0 10px 40px -10px rgba(0,0,0,0.5); }
.card-icon { width: 50px; height: 50px; background: rgba(138,43,226,0.12); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 26px; margin-bottom: 20px; }
.feature-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.feature-card p { color: var(--text-secondary); font-size: 14.5px; }
.feature-card .tag { display:inline-block; margin-top:14px; font-size:11.5px; font-weight:700; color:var(--accent-secondary); background:rgba(0,242,254,0.08); border:1px solid rgba(0,242,254,0.16); padding:3px 10px; border-radius:99px; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.step { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 18px; padding: 30px; position: relative; }
.step .n { font-size: 44px; font-weight: 900; background: var(--accent-gradient); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; line-height: 1; }
.step h3 { font-size: 18px; margin: 12px 0 8px; font-weight: 700; }
.step p { color: var(--text-secondary); font-size: 14px; }

.pricing { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 22px; align-items: stretch; }
.price-card { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 20px; padding: 30px; display: flex; flex-direction: column; }
.price-card.hot { border-color: rgba(138,43,226,0.5); box-shadow: 0 0 40px -12px rgba(138,43,226,0.5); position: relative; }
.price-card.hot::before { content: '最受欢迎'; position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--accent-gradient); color: #fff; font-size: 12px; font-weight: 700; padding: 4px 14px; border-radius: 99px; }
.price-card h3 { font-size: 20px; margin-bottom: 6px; }
.price-card .price { font-size: 15px; color: var(--text-secondary); margin-bottom: 18px; }
.price-card ul { list-style: none; margin: 0 0 22px; padding: 0; flex: 1; }
.price-card li { font-size: 14px; color: var(--text-secondary); padding: 7px 0; display: flex; gap: 8px; align-items: flex-start; }
.price-card li::before { content: '✓'; color: var(--accent-secondary); font-weight: 800; }
.price-btn { display: block; text-align: center; padding: 13px; border-radius: 12px; font-weight: 700; font-size: 15px; cursor: pointer; border: 1px solid var(--card-border); background: rgba(255,255,255,0.05); color: #fff; transition: all .3s cubic-bezier(0.25, 0.8, 0.25, 1); }
.price-btn:hover { background: rgba(255,255,255,0.1); transform: translateY(-2px); }
.price-btn.hot { background: var(--accent-gradient); border: none; box-shadow: 0 8px 24px rgba(138,43,226,0.35); }

.aud-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px,1fr)); gap: 20px; }
.aud { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 16px; padding: 24px; text-align: center; }
.aud .e { font-size: 30px; }
.aud h3 { margin: 10px 0 6px; font-size: 16px; font-weight: 700; }
.aud p { color: var(--text-secondary); font-size: 13.5px; }

.faq { max-width: 780px; margin: 0 auto; }
.faq details { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 14px; padding: 4px 22px; margin-bottom: 14px; }
.faq summary { cursor: pointer; padding: 18px 0; font-weight: 600; font-size: 16px; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; color: var(--accent-secondary); font-size: 22px; }
.faq details[open] summary::after { content: '−'; }
.faq p { color: var(--text-secondary); font-size: 14.5px; padding: 0 0 18px; }

.final-cta { text-align: center; background: linear-gradient(135deg, rgba(138,43,226,0.14), rgba(0,242,254,0.10)); border: 1px solid rgba(138,43,226,0.25); border-radius: 28px; padding: 66px 24px; margin: 40px 0 20px; }
.final-cta h2 { font-size: 42px; font-weight: 900; letter-spacing: -1px; margin-bottom: 14px; }
.final-cta p { color: var(--text-secondary); font-size: 17px; margin-bottom: 30px; }

.article { max-width: 760px; margin: 0 auto; padding: 48px 0 80px; }
.article h1 { font-size: 36px; font-weight: 800; letter-spacing: -0.8px; margin-bottom: 12px; }
.article .lead { color: var(--text-secondary); font-size: 17px; margin-bottom: 28px; }
.article h2 { font-size: 22px; font-weight: 700; margin: 32px 0 12px; }
.article h3 { font-size: 17px; font-weight: 700; margin: 22px 0 8px; }
.article p, .article li { color: var(--text-secondary); font-size: 15px; margin-bottom: 12px; }
.article ul, .article ol { padding-left: 1.2em; margin-bottom: 16px; }
.article a { color: var(--accent-secondary); text-decoration: underline; text-underline-offset: 3px; }
.article strong { color: #fff; font-weight: 600; }

.page-hero { padding: 56px 0 12px; text-align: left; }
.page-hero h1 { font-size: 42px; font-weight: 900; letter-spacing: -1px; margin-bottom: 12px; }
.page-hero p { color: var(--text-secondary); font-size: 18px; max-width: 640px; }

.error-page { text-align: center; padding: 120px 0; }
.error-page .code { font-size: 72px; font-weight: 900; background: var(--accent-gradient); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; line-height: 1; }
.error-page h1 { font-size: 28px; margin: 16px 0 10px; }
.error-page p { color: var(--text-secondary); margin-bottom: 28px; }

.dl-box { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 20px; padding: 32px; margin: 28px 0; }
.dl-box h2 { font-size: 22px; margin-bottom: 10px; }
.dl-meta { color: var(--text-secondary); font-size: 14px; margin: 10px 0 22px; }

.site-footer { padding: 50px 0 40px 0; border-top: 1px solid var(--card-border); text-align: center; font-size: 14px; color: var(--text-secondary); position: relative; z-index: 10; }
.site-footer p { margin-bottom: 8px; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 18px; margin-bottom: 14px; }
.footer-links a { color: var(--text-secondary); font-size: 13px; }
.footer-links a:hover { color: var(--text-primary); }

.atab { flex:1; padding:8px 0; border:1px solid var(--card-border); background:rgba(255,255,255,.03); color:var(--text-secondary); border-radius:8px; cursor:pointer; font-size:13px; transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1); }
.atab.active { background:var(--accent-gradient); color:#fff; border-color:transparent; }
.ainp { width:100%; box-sizing:border-box; padding:11px 13px; margin-bottom:10px; border-radius:10px; border:1px solid var(--card-border); background:rgba(255,255,255,.03); color:#fff; font-size:14px; }
.ainp:focus { outline: none; box-shadow: 0 0 0 3px rgba(138,43,226,0.25); border-color: rgba(138,43,226,0.5); }
.abtn { width:100%; padding:12px; border:none; border-radius:10px; background:var(--accent-gradient); color:#fff; font-weight:600; font-size:15px; cursor:pointer; margin-top:4px; transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1); }
.abtn:hover { transform: translateY(-1px); }
.abtn2 { width:100%; padding:10px; border:1px solid var(--card-border); border-radius:10px; background:rgba(255,255,255,.04); color:#fff; font-size:13px; cursor:pointer; }

.crumbs { font-size: 13px; color: var(--text-secondary); margin: 4px 0 22px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.crumbs a { color: var(--accent-secondary); }
.crumbs span.sep { opacity: 0.4; }
.compare { width: 100%; border-collapse: collapse; margin: 8px 0 28px; }
.compare th, .compare td { border: 1px solid var(--card-border); padding: 12px 14px; text-align: left; font-size: 14px; vertical-align: top; }
.compare th { background: rgba(255,255,255,.04); font-weight: 600; }
.compare td { color: var(--text-secondary); }
.compare td:first-child { color: #fff; font-weight: 600; width: 28%; }
.guide-stack { display: grid; gap: 18px; margin: 8px 0 28px; }
.guide-item { display: block; background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 16px; padding: 22px 24px; transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1); }
.guide-item:hover { transform: translateY(-2px); border-color: rgba(0,242,254,0.22); }
.guide-item h2 { font-size: 20px; margin-bottom: 8px; }
.guide-item p { color: var(--text-secondary); font-size: 14.5px; margin: 0; }

@media (max-width: 820px) {
    .hero h1 { font-size: 38px; }
    .hero { padding: 56px 0 30px 0; }
    .page-hero h1, .article h1 { font-size: 30px; }
    .stats-row { grid-template-columns: repeat(2,1fr); }
    .steps { grid-template-columns: 1fr; }
    .section-head h2, .final-cta h2 { font-size: 30px; }
    .cta-group { flex-direction: column; align-items: center; }
    .btn-primary, .btn-secondary { width: 100%; max-width: 340px; justify-content: center; }
    .nav-links a:not(.nav-btn) { display: none; }
}