:root{
  --bg:#0b0b10;
  --card:#14141c;
  --primary:#ff2d55;
  --primary-glow:rgba(255,45,85,.35);
  --text:#f1f1f6;
  --muted:#8e8e98;
  --border:rgba(255,255,255,.08);
}
*{box-sizing:border-box;margin:0;padding:0}
html{background:var(--bg);color:var(--text);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;-webkit-font-smoothing:antialiased}
body{min-height:100vh;line-height:1.5}
button{font:inherit;color:inherit;cursor:pointer;border:0;background:none}
h1,h2{font-weight:900;letter-spacing:-.02em}
img{display:block;max-width:100%}

/* ── Hero ── */
.hero{
  position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;
  text-align:center;padding:60px 24px 48px;overflow:hidden;
}
/* Background layer — pure image, no overlay on top portion */
.hero-bg{
  position:absolute;inset:0;z-index:0;
  background:url("/assets/images/changtu.jpg") center 30%/cover no-repeat;
}
/* Gradient mask — subtle darkening at bottom only */
.hero-mask{
  position:absolute;inset:0;z-index:1;
  background:linear-gradient(180deg,
    rgba(11,11,16,0)    0%,
    rgba(11,11,16,0)    55%,
    rgba(11,11,16,.2)   70%,
    rgba(11,11,16,.5)   85%,
    var(--bg)            100%
  );
}
.hero-content{width:min(480px,100%);position:relative;z-index:2}

.badge{
  display:inline-block;padding:6px 16px;border-radius:99px;
  border:1px solid rgba(255,255,255,.3);background:rgba(0,0,0,.45);
  backdrop-filter:blur(8px);color:#fff;font-size:13px;font-weight:800;margin-bottom:24px
}
h1{
  font-size:clamp(56px,10vw,80px);line-height:.9;
  background:linear-gradient(135deg,#ff2d55,#ff6b6b);-webkit-background-clip:text;
  -webkit-text-fill-color:transparent;background-clip:text;margin-bottom:12px;
  text-shadow:none
}
.hero-sub{font-size:18px;line-height:1.5;color:#fff;margin-bottom:28px;max-width:360px;margin-left:auto;margin-right:auto;text-shadow:0 1px 8px rgba(0,0,0,.7)}

.users-line{display:flex;align-items:center;justify-content:center;gap:8px;font-size:14px;color:var(--muted);margin-bottom:32px}
.users-dot{width:8px;height:8px;border-radius:50%;background:#22c55e;box-shadow:0 0 8px #22c55e}
.users-line strong{color:var(--text);font-weight:900}

.btn-main{
  display:flex;align-items:center;justify-content:center;width:100%;min-height:60px;
  border-radius:14px;font-size:20px;font-weight:800;color:#fff;
  background:linear-gradient(135deg,#ff2d55,#e02340);
  box-shadow:0 8px 30px var(--primary-glow),0 2px 8px rgba(0,0,0,.3);
  transition:transform .15s,box-shadow .15s
}
.btn-main:active{transform:scale(.97)}
.btn-main:hover{box-shadow:0 12px 36px rgba(255,45,85,.5),0 4px 12px rgba(0,0,0,.3)}

.btn-secondary{display:flex;gap:8px;margin-top:12px}
.btn-secondary button{
  flex:1;min-height:44px;border-radius:10px;font-size:14px;font-weight:700;
  color:var(--text);background:rgba(0,0,0,.5);border:1px solid rgba(255,255,255,.12);
  backdrop-filter:blur(8px);transition:background .15s
}
.btn-secondary button:hover{background:rgba(255,255,255,.1)}

/* ── Sections ── */
.section{padding:50px 24px;max-width:680px;margin:0 auto}
.section-title{font-size:28px;text-align:center;margin-bottom:32px}

/* Features */
.features-grid{display:grid;gap:16px}
.feature-card{display:flex;gap:16px;align-items:flex-start;padding:20px;border-radius:14px;background:var(--card);border:1px solid var(--border)}
.feature-icon{font-size:32px;flex-shrink:0;width:48px;text-align:center}
.feature-card h3{font-size:17px;font-weight:800;margin-bottom:4px}
.feature-card p{font-size:14px;color:var(--muted);line-height:1.5}

/* FAQ */
.faq-section{background:var(--card);max-width:100%;padding:50px 24px}
.faq-section .section-title{margin-bottom:28px}
.faq-list{max-width:680px;margin:0 auto;display:grid;gap:10px}
.faq-item{padding:18px 20px;border-radius:12px;background:var(--bg);border:1px solid var(--border)}
.faq-item strong{display:block;font-size:15px;font-weight:800;margin-bottom:6px}
.faq-item p{font-size:14px;color:var(--muted);line-height:1.5}

/* CTA */
.cta-section{text-align:center;padding:60px 24px}
.cta-section h2{font-size:32px;margin-bottom:8px}
.cta-section>p{font-size:18px;color:var(--muted);margin-bottom:32px}
.cta-section .btn-main{max-width:420px;margin:0 auto}
.footnote{margin-top:20px;font-size:13px;color:var(--muted)}

/* Footer */
footer{text-align:center;padding:24px;font-size:13px;color:var(--muted);border-top:1px solid var(--border)}

/* ── Desktop ── */
@media (min-width:768px){
  .hero-bg{background-attachment:fixed}
  .features-grid{grid-template-columns:repeat(3,1fr)}
  .feature-card{flex-direction:column;text-align:center;align-items:center}
  .faq-list{grid-template-columns:repeat(2,1fr)}
}