/* TrendLab — Teal/Teal Science Theme */
:root{--pri:#0d9488;--pri-d:#0f766e;--pri-l:#14b8a6;--bg:#f0fdfa;--card:#fff;--text:#134e4a;--muted:#5eead4}
*,::before,::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Inter","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.6;overflow-x:hidden}
.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}

/* Nav */
.nav{position:fixed;top:0;width:100%;z-index:50;padding:1rem 0;transition:all .3s}
.nav.scrolled{background:rgba(255,255,255,.85);backdrop-filter:blur(20px);box-shadow:0 1px 0 rgba(0,0,0,.05)}
.nav-inner{display:flex;align-items:center;justify-content:space-between}
.nav-brand{display:flex;align-items:center;gap:.6rem;text-decoration:none}
.nav-logo{width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,var(--pri),#0891b2);display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.1rem;box-shadow:0 4px 12px rgba(13,148,136,.3)}
.nav-name{font-size:1.25rem;font-weight:800;color:#0f172a}
.nav-links{display:flex;gap:2rem;align-items:center}
.nav-links a{text-decoration:none;font-weight:600;font-size:.875rem;color:#475569;transition:color .2s}
.nav-links a:hover{color:var(--pri)}
.nav-cta{padding:.6rem 1.4rem;background:var(--pri);color:#fff!important;border-radius:50px;font-weight:700!important;transition:all .25s!important}
.nav-cta:hover{background:var(--pri-d);box-shadow:0 6px 20px rgba(13,148,136,.35)}
.nav-toggle{display:none;background:none;border:none;color:#334155;font-size:1.4rem;cursor:pointer}

/* Hero — split layout */
.hero{padding-top:7rem;padding-bottom:4rem;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:-120px;right:-120px;width:500px;height:500px;background:radial-gradient(circle,rgba(13,148,136,.08) 0%,transparent 70%);border-radius:50%}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center}
.hero-badge{display:inline-flex;align-items:center;gap:.4rem;padding:.35rem 1rem;background:rgba(13,148,136,.08);border:1px solid rgba(13,148,136,.2);border-radius:50px;font-size:.8rem;font-weight:700;color:var(--pri);margin-bottom:1.2rem}
.hero-badge i{font-size:.7rem}
.hero h1{font-size:3.2rem;font-weight:900;line-height:1.15;color:#0f172a;margin-bottom:1.2rem}
.hero h1 .hl{background:linear-gradient(135deg,var(--pri),#0891b2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{font-size:1.05rem;color:#64748b;line-height:1.7;margin-bottom:2rem;max-width:440px}
.hero-btns{display:flex;gap:1rem;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.85rem 1.8rem;border-radius:14px;font-weight:700;font-size:.95rem;text-decoration:none;transition:all .25s;cursor:pointer;border:none}
.btn-pri{background:var(--pri);color:#fff;box-shadow:0 8px 24px rgba(13,148,136,.3)}
.btn-pri:hover{background:var(--pri-d);transform:translateY(-2px);box-shadow:0 12px 32px rgba(13,148,136,.4)}
.btn-out{background:#fff;color:var(--text);border:2px solid #cbd5e1}
.btn-out:hover{border-color:var(--pri);color:var(--pri)}
.hero-visual{display:flex;justify-content:center;align-items:center}
.floating-card{background:var(--card);border-radius:24px;padding:2rem;box-shadow:0 24px 64px rgba(0,0,0,.08);border:1px solid rgba(13,148,136,.1);width:100%;max-width:380px;animation:floatCard 4s ease-in-out infinite}
@keyframes floatCard{0%,100%{transform:translateY(0)}50%{transform:translateY(-16px)}}
.fc-header{display:flex;align-items:center;gap:.6rem;margin-bottom:1.2rem}
.fc-dot{width:12px;height:12px;border-radius:50%;background:var(--pri-l)}
.fc-label{font-size:.75rem;font-weight:700;color:var(--pri);text-transform:uppercase;letter-spacing:.1em}
.fc-value{font-size:2.4rem;font-weight:900;color:#0f172a;margin-bottom:.3rem}
.fc-sub{font-size:.8rem;color:#94a3b8}
.fc-bars{display:flex;gap:4px;align-items:flex-end;height:80px;margin-top:1.2rem}
.fc-bar{flex:1;background:var(--pri-l);border-radius:4px 4px 0 0;opacity:.6}

/* Section titles */
.section-title{text-align:center;margin-bottom:3.5rem}
.section-title h2{font-size:2.5rem;font-weight:900;color:#0f172a;margin-bottom:.6rem}
.section-title h2 .hl{color:var(--pri)}
.section-title p{color:#64748b;font-size:1rem}

/* Features — 3-column cards */
.features{padding:5rem 1.5rem;background:#fff}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
.feat-card{background:#fff;border:1px solid #e2e8f0;border-radius:20px;padding:2rem;transition:all .35s;position:relative;overflow:hidden}
.feat-card::before{content:'';position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--pri),#0891b2);opacity:0;transition:opacity .35s}
.feat-card:hover::before{opacity:1}
.feat-card:hover{transform:translateY(-8px);box-shadow:0 20px 48px rgba(0,0,0,.08);border-color:transparent}
.feat-icon{width:52px;height:52px;border-radius:16px;background:rgba(13,148,136,.1);display:flex;align-items:center;justify-content:center;color:var(--pri);font-size:1.4rem;margin-bottom:1.2rem;transition:all .35s}
.feat-card:hover .feat-icon{background:var(--pri);color:#fff;transform:scale(1.1)}
.feat-card h3{font-size:1.15rem;font-weight:700;margin-bottom:.6rem;color:#0f172a}
.feat-card p{font-size:.9rem;color:#64748b;line-height:1.65}

/* Stats bar */
.stats-bar{background:linear-gradient(135deg,#0f172a,#134e4a);padding:4rem 1.5rem;position:relative;overflow:hidden}
.stats-bar::before{content:'';position:absolute;inset:0;background:linear-gradient(45deg,transparent 40%,rgba(13,148,136,.05) 50%,transparent 60%);background-size:200% 200%;animation:shimmer 6s linear infinite}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:2rem;text-align:center}
.stat-item .stat-num{font-size:3rem;font-weight:900;color:#fff;margin-bottom:.2rem}
.stat-item .stat-num .stat-unit{font-size:1.2rem;color:var(--pri-l)}
.stat-item .stat-label{color:rgba(255,255,255,.55);font-weight:600;font-size:.85rem}

/* Testimonials */
.testimonials{padding:5rem 1.5rem;background:var(--bg)}
.testi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
.testi-card{background:#fff;border-radius:20px;padding:2rem;border:1px solid #e2e8f0;transition:all .3s}
.testi-card:hover{box-shadow:0 12px 36px rgba(0,0,0,.06)}
.testi-stars{color:#f59e0b;font-size:.8rem;margin-bottom:1rem}
.testi-text{color:#475569;font-size:.9rem;line-height:1.7;margin-bottom:1.2rem;font-style:italic}
.testi-author{display:flex;align-items:center;gap:.7rem}
.testi-avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--pri),#0891b2);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.8rem}
.testi-name{font-weight:700;font-size:.85rem;color:#0f172a}
.testi-role{font-size:.75rem;color:#94a3b8}

/* FAQ — accordion */
.faq{padding:5rem 1.5rem;background:#fff}
.faq-list{max-width:720px;margin:0 auto;display:flex;flex-direction:column;gap:.75rem}
.faq-item{background:#f8fafc;border:1px solid #e2e8f0;border-radius:16px;overflow:hidden;transition:all .3s}
.faq-item:hover{border-color:var(--pri-l)}
.faq-q{width:100%;background:none;border:none;padding:1.2rem 1.5rem;display:flex;justify-content:space-between;align-items:center;font-weight:700;font-size:.95rem;color:#0f172a;cursor:pointer;text-align:left}
.faq-q i{color:var(--pri);transition:transform .3s;font-size:.85rem}
.faq-item.open .faq-q i{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease,padding .35s ease}
.faq-item.open .faq-a{max-height:300px;padding:0 1.5rem 1.2rem}
.faq-a p{color:#64748b;font-size:.9rem;line-height:1.7}

/* CTA */
.cta{padding:5rem 1.5rem;background:linear-gradient(135deg,#0f172a,#115e59);position:relative;overflow:hidden;text-align:center}
.cta::after{content:'';position:absolute;inset:0;background:url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='30' cy='30' r='1.5' fill='white' opacity='.03'/%3E%3C/svg%3E")}
.cta h2{font-size:2.8rem;font-weight:900;color:#fff;position:relative;z-index:1;margin-bottom:1rem}
.cta h2 .hl{color:var(--pri-l)}
.cta p{color:rgba(255,255,255,.6);font-size:1.05rem;position:relative;z-index:1;margin-bottom:2rem}
.cta-btns{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;position:relative;z-index:1}

/* Footer */
.footer{background:#0f172a;color:#94a3b8;padding:3rem 1.5rem 1.5rem}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:2.5rem;margin-bottom:2rem}
.footer h4{color:#fff;font-size:.85rem;font-weight:700;margin-bottom:.8rem}
.footer a{color:#94a3b8;text-decoration:none;font-size:.83rem;transition:color .2s;display:block;margin-bottom:.4rem}
.footer a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:1.5rem;text-align:center;font-size:.8rem}

/* Responsive */
@media(max-width:768px){
  .nav-links{display:none}.nav-toggle{display:block}
  .hero-grid{grid-template-columns:1fr}.hero h1{font-size:2.2rem}
  .features-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .testi-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}