/* 02_黑料社区SaaS级舆情监控与数据分析平台 - 全局样式 */
:root{
  --primary:#00D4FF;--secondary:#0A1628;--bg:#0A1628;--card-bg:#112240;
  --accent:#00E5FF;--text:#E0E0E0;--text-muted:#8892B0;
  --success:#00C853;--warning:#FFD600;--danger:#FF1744;
  --border:rgba(255,255,255,0.1);
  --font:'Inter',-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:'Roboto Mono','Courier New',monospace;
  --code:'Fira Code','Consolas',monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--accent)}
h1,h2,h3,h4{font-weight:700;line-height:1.3;color:#fff;margin:0 0 .6em}
h1{font-size:clamp(2rem,5vw,3.4rem)}
h2{font-size:clamp(1.5rem,3.5vw,2.2rem)}
h3{font-size:1.25rem}
img{max-width:100%;height:auto;display:block}
.container{max-width:1240px;margin:0 auto;padding:0 24px}
.mono{font-family:var(--mono)}
.muted{color:var(--text-muted)}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(10,22,40,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:1.15rem}
.brand-dot{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--primary),var(--accent));box-shadow:0 0 16px var(--primary)}
.nav-links{display:flex;gap:28px;align-items:center}
.nav-links a{color:var(--text);font-size:.95rem;font-weight:500}
.nav-links a:hover{color:var(--primary)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;border-radius:10px;font-weight:600;font-size:.95rem;border:1px solid transparent;cursor:pointer;transition:all .2s;font-family:inherit}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--accent));color:#0A1628;box-shadow:0 0 0 0 rgba(0,212,255,.6)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,212,255,.35);color:#0A1628}
.btn-ghost{background:transparent;border-color:var(--border);color:var(--text)}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary)}
.menu-toggle{display:none;background:none;border:none;color:var(--text);font-size:1.4rem;cursor:pointer}

/* Hero */
.hero{padding:80px 0 60px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 80% 20%,rgba(0,212,255,.15),transparent 50%),radial-gradient(circle at 10% 70%,rgba(0,229,255,.1),transparent 50%);pointer-events:none}
.hero-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:60px;align-items:center;position:relative}
.eyebrow{display:inline-block;font-family:var(--mono);font-size:.78rem;color:var(--primary);background:rgba(0,212,255,.1);border:1px solid rgba(0,212,255,.3);padding:6px 12px;border-radius:99px;margin-bottom:18px;letter-spacing:.05em}
.hero h1 span{background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lede{font-size:1.1rem;color:var(--text-muted);margin:0 0 30px;max-width:560px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-visual{position:relative;aspect-ratio:1/1;max-width:520px;justify-self:end}
.hero-visual img{width:100%;border-radius:50%;animation:spin 60s linear infinite;filter:drop-shadow(0 0 40px rgba(0,212,255,.4))}
@keyframes spin{to{transform:rotate(360deg)}}

/* Sections */
section{padding:70px 0}
.section-head{text-align:center;max-width:760px;margin:0 auto 50px}
.section-head .eyebrow{margin-bottom:14px}
.section-head p{color:var(--text-muted);font-size:1.05rem}

/* Cards / Grids */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--card-bg);border:1px solid var(--border);border-radius:16px;padding:28px;transition:transform .25s,box-shadow .25s,border-color .25s}
.card:hover{transform:translateY(-2px);border-color:rgba(0,212,255,.4);box-shadow:0 12px 40px rgba(0,212,255,.12)}
.card .icon{width:44px;height:44px;border-radius:12px;background:rgba(0,212,255,.12);display:flex;align-items:center;justify-content:center;color:var(--primary);font-size:1.4rem;margin-bottom:16px}
.card h3{margin-bottom:8px}
.card p{color:var(--text-muted);margin:0;font-size:.95rem}

/* Logo wall */
.logo-wall{overflow:hidden;border-top:1px solid var(--border);border-bottom:1px solid var(--border);padding:32px 0;background:rgba(17,34,64,.4)}
.logo-track{display:flex;gap:64px;animation:marquee 30s linear infinite;width:max-content}
.logo-track span{color:var(--text-muted);font-weight:600;font-size:1.1rem;white-space:nowrap;opacity:.6}
@keyframes marquee{to{transform:translateX(-50%)}}

/* KPI / Stats */
.kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.kpi{background:var(--card-bg);border:1px solid var(--border);border-radius:14px;padding:22px;text-align:center}
.kpi .num{font-family:var(--mono);font-size:2rem;color:var(--primary);font-weight:700}
.kpi .lbl{color:var(--text-muted);font-size:.85rem;margin-top:6px}

/* Dashboard preview */
.dash-preview{background:var(--card-bg);border:1px solid var(--border);border-radius:20px;padding:18px;overflow:hidden;box-shadow:0 30px 80px rgba(0,0,0,.4)}
.dash-preview img{border-radius:12px;width:100%}

/* Pricing */
.pricing{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch}
.plan{background:var(--card-bg);border:1px solid var(--border);border-radius:18px;padding:34px 28px;display:flex;flex-direction:column;gap:16px;position:relative}
.plan.popular{border-color:var(--primary);box-shadow:0 0 0 1px var(--primary),0 20px 50px rgba(0,212,255,.15)}
.plan .badge{position:absolute;top:-12px;right:24px;background:linear-gradient(135deg,var(--primary),var(--accent));color:#0A1628;font-size:.75rem;font-weight:700;padding:5px 12px;border-radius:99px}
.plan h3{font-size:1.3rem;margin:0}
.plan .price{font-family:var(--mono);font-size:2.2rem;color:#fff;font-weight:700}
.plan .price small{font-size:.9rem;color:var(--text-muted);font-weight:400}
.plan ul{list-style:none;padding:0;margin:8px 0;flex:1}
.plan li{padding:8px 0;color:var(--text);font-size:.93rem;border-bottom:1px dashed var(--border);display:flex;gap:10px;align-items:flex-start}
.plan li::before{content:"✓";color:var(--success);font-weight:700;flex-shrink:0}

/* Tabs */
.tabs{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-bottom:24px}
.tab{padding:10px 18px;border-radius:99px;border:1px solid var(--border);background:transparent;color:var(--text-muted);cursor:pointer;font-family:inherit;font-size:.9rem;transition:all .2s}
.tab.active,.tab:hover{background:rgba(0,212,255,.1);color:var(--primary);border-color:var(--primary)}
.tab-panel{display:none}
.tab-panel.active{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}

/* Testimonials */
.testi{background:var(--card-bg);border:1px solid var(--border);border-radius:16px;padding:28px}
.testi p{font-style:italic;color:var(--text)}
.testi .who{display:flex;align-items:center;gap:12px;margin-top:18px}
.avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;color:#0A1628;font-weight:700}

/* Code blocks */
pre{background:#0A1628;border:1px solid var(--border);border-radius:12px;padding:18px;overflow-x:auto;font-family:var(--code);font-size:.85rem;color:#a8e3ff}
code{font-family:var(--code);background:rgba(0,212,255,.08);padding:2px 6px;border-radius:4px;font-size:.88em;color:var(--accent)}
pre code{background:none;padding:0}

/* FAQ */
.faq details{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;padding:18px 22px;margin-bottom:12px}
.faq summary{cursor:pointer;font-weight:600;color:#fff;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::after{content:"+";color:var(--primary);font-size:1.4rem;font-weight:300;transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq p{color:var(--text-muted);margin:14px 0 0}

/* CTA */
.cta-band{background:linear-gradient(135deg,rgba(0,212,255,.1),rgba(0,229,255,.05));border:1px solid rgba(0,212,255,.3);border-radius:24px;padding:60px 40px;text-align:center;margin:40px 0}
.cta-band h2{margin-bottom:14px}
.cta-form{display:flex;gap:10px;max-width:480px;margin:24px auto 0;flex-wrap:wrap;justify-content:center}
.cta-form input{flex:1;min-width:220px;padding:12px 16px;border-radius:10px;border:1px solid var(--border);background:var(--card-bg);color:var(--text);font-family:inherit}
.cta-form input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(0,212,255,.2)}

/* Footer */
.site-footer{background:#070f1f;border-top:1px solid var(--border);padding:60px 0 30px;margin-top:60px}
.foot-grid{display:grid;grid-template-columns:1.5fr repeat(4,1fr);gap:40px;margin-bottom:40px}
.foot-grid h4{font-size:.9rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);margin-bottom:14px}
.foot-grid ul{list-style:none;padding:0;margin:0}
.foot-grid li{padding:5px 0}
.foot-grid a{color:var(--text);font-size:.9rem}
.foot-grid a:hover{color:var(--primary)}
.foot-bottom{border-top:1px solid var(--border);padding-top:24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;color:var(--text-muted);font-size:.85rem}
.socials{display:flex;gap:14px}
.socials a{width:34px;height:34px;border-radius:8px;background:var(--card-bg);display:flex;align-items:center;justify-content:center;color:var(--text-muted)}
.socials a:hover{color:var(--primary)}

/* Chart canvas */
.chart-wrap{background:var(--card-bg);border:1px solid var(--border);border-radius:14px;padding:18px}
.chart-wrap h3{font-size:1rem;color:var(--text-muted);font-weight:500;margin-bottom:12px;display:flex;justify-content:space-between;align-items:center}
.chart-wrap h3 .live{font-family:var(--mono);font-size:.75rem;color:var(--success);display:flex;align-items:center;gap:6px}
.chart-wrap h3 .live::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--success);box-shadow:0 0 0 0 var(--success);animation:pulse 2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(0,200,83,.6)}70%{box-shadow:0 0 0 10px rgba(0,200,83,0)}100%{box-shadow:0 0 0 0 rgba(0,200,83,0)}}
canvas{display:block;width:100%;max-height:320px}

/* Article / Blog */
article.post{max-width:820px;margin:0 auto}
article.post h1{margin-top:0}
article.post p{color:var(--text);margin:0 0 18px}
.breadcrumb{font-size:.85rem;color:var(--text-muted);margin:24px 0}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--primary)}

/* Alert */
.alert{padding:14px 18px;border-radius:10px;border:1px solid var(--border);background:rgba(255,23,68,.08);border-color:rgba(255,23,68,.3);color:#ffb3c0;font-size:.9rem;display:flex;gap:10px;align-items:center}

/* Responsive */
@media(max-width:960px){
  .nav-links{display:none;position:absolute;top:68px;left:0;right:0;background:var(--secondary);flex-direction:column;padding:20px;border-bottom:1px solid var(--border);gap:14px}
  .nav-links.open{display:flex}
  .menu-toggle{display:block}
  .hero-grid,.tab-panel.active{grid-template-columns:1fr}
  .hero-visual{justify-self:center;max-width:340px}
  .grid-3,.grid-4,.pricing,.kpis,.foot-grid{grid-template-columns:1fr 1fr}
  .grid-2{grid-template-columns:1fr}
}
@media(max-width:560px){
  .grid-3,.grid-4,.pricing,.kpis,.foot-grid{grid-template-columns:1fr}
  section{padding:50px 0}
  .hero{padding:50px 0 30px}
}

/* Focus a11y */
:focus-visible{outline:2px solid var(--primary);outline-offset:3px;border-radius:6px}