:root{
  --ink:#13131f; --ink2:#1b1c2b; --card:#ffffff; --line:#ece7dd;
  --gold:#c9a14a; --gold2:#e7c97e; --txt:#2b2b33; --sub:#6f6b63;
  --soft:#faf7f1;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--txt);line-height:1.75;background:#fff;overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{text-decoration:none}
img{max-width:100%;height:auto;display:block}

/* ===== 按钮 ===== */
.btn-gold{background:linear-gradient(135deg,var(--gold),var(--gold2));color:#231a06;
  border:0;padding:.95rem 2.2rem;font-weight:700;border-radius:50px;
  box-shadow:0 8px 22px rgba(201,161,74,.35);transition:.25s;font-size:1.05rem;
  display:inline-flex;align-items:center;justify-content:center;gap:.4rem;
  min-height:48px;min-width:180px}
.btn-gold:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(201,161,74,.45);color:#231a06}
.btn-gold:active{transform:translateY(0)}

/* ===== 导航 ===== */
.nav-bar{background:rgba(19,19,31,.92);backdrop-filter:blur(10px);position:fixed;
  width:100%;top:0;z-index:1000;padding:.7rem 0;transition:.3s}
.nav-bar.s{box-shadow:0 2px 20px rgba(0,0,0,.25)}
.brand{font-size:1.4rem;font-weight:800;color:var(--gold2)!important;display:flex;align-items:center;gap:.5rem}
.nav-link{color:rgba(255,255,255,.82)!important;font-weight:500;margin:0 .4rem;padding:.6rem .8rem!important}
.nav-link:hover{color:var(--gold2)!important}
.navbar-toggler{border:1px solid rgba(255,255,255,.2);border-radius:8px;padding:.4rem .6rem}

/* ===== Hero ===== */
.hero{background:radial-gradient(1200px 500px at 70% -10%,#2a2c44 0,#13131f 55%);
  min-height:100vh;display:flex;align-items:center;padding-top:90px;position:relative}
.hero h1{font-size:3.1rem;font-weight:800;color:#fff;line-height:1.25;margin-bottom:1.2rem}
.hero h1 b{color:var(--gold2)}
.hero .lead2{font-size:1.18rem;color:rgba(255,255,255,.78);max-width:540px;margin-bottom:1.8rem}
.tagline{display:inline-flex;align-items:center;gap:.5rem;background:rgba(201,161,74,.14);
  border:1px solid rgba(201,161,74,.35);color:var(--gold2);font-size:.9rem;
  padding:.4rem 1rem;border-radius:50px;margin-bottom:1.6rem}
.hero .mini{color:rgba(255,255,255,.6);font-size:.88rem;margin-top:1rem}
.hero .mini i{color:var(--gold2)}

/* hero 卡片 */
.demo{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);
  border-radius:20px;padding:1.6rem;backdrop-filter:blur(8px)}
.demo .top{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}
.demo .top span{color:var(--gold2);font-weight:600}
.pillars{display:grid;grid-template-columns:repeat(4,1fr);gap:.5rem}
.pill{background:rgba(201,161,74,.12);border:1px solid rgba(201,161,74,.3);
  border-radius:10px;padding:.7rem 0;text-align:center;color:var(--gold2)}
.pill .g{font-size:1.3rem;font-weight:800}
.pill .z{font-size:1rem;opacity:.85}
.ai-bubble{background:#fff;color:#333;border-radius:14px;padding:1rem 1.1rem;margin-top:1rem;
  font-size:.92rem;line-height:1.75;box-shadow:0 12px 35px rgba(0,0,0,.25)}
.ai-bubble .who{display:flex;align-items:center;gap:.5rem;color:var(--gold);
  font-weight:700;font-size:.85rem;margin-bottom:.4rem}
.typing{color:var(--sub)}

/* ===== 区块 ===== */
.sec{padding:5rem 0}
.sec.soft{background:var(--soft)}
.head{text-align:center;max-width:640px;margin:0 auto 3rem;padding:0 1rem}
.head h2{font-size:2.2rem;font-weight:800;color:var(--ink);margin-bottom:.8rem}
.head p{color:var(--sub);font-size:1.05rem}

/* ===== AI能读懂什么 - 卡片 ===== */
.read-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:1.8rem;height:100%;
  transition:.25s;box-shadow:0 2px 8px rgba(0,0,0,.04)}
.read-card:hover{transform:translateY(-4px);box-shadow:0 16px 40px rgba(0,0,0,.08)}
.read-ic{width:54px;height:54px;border-radius:14px;display:flex;align-items:center;
  justify-content:center;font-size:1.5rem;color:#fff;margin-bottom:1rem;
  background:linear-gradient(135deg,var(--ink2),#33354f)}
.read-card h4{font-size:1.15rem;font-weight:700;margin-bottom:.5rem;color:var(--ink)}
.read-card p{color:var(--sub);font-size:.95rem;margin:0}

/* ===== 三步 ===== */
.step{text-align:center;padding:1rem}
.step .n{width:62px;height:62px;border-radius:50%;margin:0 auto 1rem;
  background:linear-gradient(135deg,var(--gold),var(--gold2));color:#231a06;
  font-size:1.6rem;font-weight:800;display:flex;align-items:center;justify-content:center}
.step h5{font-weight:700;color:var(--ink);margin-bottom:.4rem}
.step p{color:var(--sub);font-size:.92rem;margin:0}

/* ===== 数据条 ===== */
.bar{background:linear-gradient(135deg,var(--ink2),var(--ink));padding:3rem 0;color:#fff}
.bar .n{font-size:2.4rem;font-weight:800;color:var(--gold2);display:block}
.bar .l{opacity:.8;font-size:.92rem}

/* ===== 评价 ===== */
.tcard{background:#fff;border:1px solid var(--line);border-radius:16px;padding:1.6rem;height:100%;
  box-shadow:0 2px 8px rgba(0,0,0,.04)}
.tcard .stars{color:var(--gold);margin-bottom:.6rem}
.tcard p{color:#444;margin-bottom:1rem}
.tcard .who{display:flex;align-items:center;gap:.7rem}
.av{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--ink2),#3a3c58);
  color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;flex-shrink:0}
.who h6{margin:0;font-size:.95rem;font-weight:700}
.who span{font-size:.8rem;color:#999}

/* ===== FAQ ===== */
.accordion-item{border:1px solid var(--line);margin-bottom:.8rem;border-radius:12px!important;overflow:hidden}
.accordion-button{font-weight:600;color:var(--ink);padding:1rem 1.2rem}
.accordion-button:not(.collapsed){color:var(--gold);background:var(--soft);box-shadow:none}
.accordion-button:focus{box-shadow:none}
.accordion-body{color:var(--sub);padding:1rem 1.2rem}

/* ===== CTA ===== */
.cta{background:radial-gradient(900px 400px at 50% 120%,#2a2c44 0,#13131f 60%);padding:5rem 0;text-align:center}
.cta h2{color:#fff;font-size:2.3rem;font-weight:800;margin-bottom:.8rem}
.cta p{color:rgba(255,255,255,.78);margin-bottom:2rem}
.badges{display:flex;justify-content:center;gap:1.6rem;flex-wrap:wrap;margin-bottom:2rem}
.badges span{color:var(--gold2);font-size:.92rem}

/* ===== Footer ===== */
.foot{background:#0e0e18;color:rgba(255,255,255,.6);padding:3rem 0 1.5rem;font-size:.92rem}
.foot a{color:rgba(255,255,255,.6)}
.foot a:hover{color:var(--gold2)}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:2rem;padding-top:1.4rem;text-align:center;font-size:.82rem}

/* ===== 浮动底部条 ===== */
.mobile-cta{position:fixed;left:0;right:0;bottom:0;z-index:998;padding:.7rem 1rem;
  background:rgba(19,19,31,.95);backdrop-filter:blur(8px);border-top:1px solid rgba(255,255,255,.1);display:none}
.mobile-cta a{display:block;text-align:center;background:linear-gradient(135deg,var(--gold),var(--gold2));
  color:#231a06;font-weight:700;padding:.85rem;border-radius:10px;min-height:48px}

/* ===== 弹窗 ===== */
.modal-header{background:linear-gradient(135deg,var(--ink2),var(--ink));color:#fff;border:0}
.modal-content{border:0;border-radius:16px}
.modal-body h6{color:var(--ink);font-weight:700;margin-top:1.2rem}
.modal-body p{color:#555;margin-bottom:.4rem}

/* ============================================
   移动端适配 - 重点优化
   ============================================ */
@media(max-width:768px){
  /* 基础 */
  body{font-size:15px}
  .sec{padding:3rem 0}
  .head{margin-bottom:2rem}

  /* 导航 */
  .brand{font-size:1.15rem}
  .nav-bar{padding:.5rem 0}
  .navbar-collapse{background:rgba(19,19,31,.98);border-radius:12px;margin-top:.5rem;padding:.5rem 0}
  .nav-link{padding:.7rem 1rem!important;margin:0;border-bottom:1px solid rgba(255,255,255,.06)}
  .nav-link:last-child{border-bottom:0}

  /* Hero */
  .hero{padding-top:80px;min-height:auto;padding-bottom:3rem;text-align:center}
  .hero h1{font-size:1.9rem;line-height:1.3;margin-bottom:1rem}
  .hero .lead2{font-size:1rem;margin-bottom:1.4rem}
  .tagline{font-size:.82rem;padding:.35rem .8rem;margin-bottom:1.2rem}
  .btn-gold{padding:.85rem 1.6rem;font-size:1rem;min-width:auto;width:90%;max-width:320px}
  .hero .mini{font-size:.8rem;margin-top:.8rem}
  .hero .mini i{font-size:.75rem}

  /* 卡片 */
  .read-card{padding:1.4rem;margin-bottom:0}
  .read-ic{width:48px;height:48px;font-size:1.3rem;border-radius:12px}
  .read-card h4{font-size:1.05rem}
  .read-card p{font-size:.9rem}

  /* 三步 */
  .step{padding:.8rem 0}
  .step .n{width:52px;height:52px;font-size:1.4rem}
  .step h5{font-size:1rem}
  .step p{font-size:.88rem}

  /* 数据条 */
  .bar{padding:2rem 0}
  .bar .n{font-size:1.8rem}
  .bar .l{font-size:.82rem}
  .bar .col-6{margin-bottom:1.2rem}
  .bar .col-6:nth-child(3),.bar .col-6:nth-child(4){margin-bottom:0}

  /* 评价 */
  .tcard{padding:1.3rem;margin-bottom:0}
  .tcard p{font-size:.9rem}
  .av{width:40px;height:40px;font-size:.85rem}
  .who h6{font-size:.9rem}
  .who span{font-size:.78rem}

  /* FAQ */
  .accordion-button{padding:.85rem 1rem;font-size:.95rem}
  .accordion-body{padding:.85rem 1rem;font-size:.9rem}

  /* CTA */
  .cta{padding:3rem 1rem}
  .cta h2{font-size:1.6rem}
  .cta p{font-size:.95rem}
  .badges{gap:.8rem}
  .badges span{font-size:.82rem}
  .btn-lg{padding:.9rem 1.8rem;font-size:1rem}

  /* Footer */
  .foot{padding:2rem 1rem 1rem}
  .foot-bottom{font-size:.78rem;padding-top:1rem}

  /* 浮动条 */
  .mobile-cta{display:block}
  body{padding-bottom:70px}
}

/* 超小屏 */
@media(max-width:375px){
  .hero h1{font-size:1.7rem}
  .head h2{font-size:1.5rem}
  .btn-gold{padding:.8rem 1.4rem;font-size:.95rem}
  .bar .n{font-size:1.6rem}
  .cta h2{font-size:1.4rem}
}

/* 平板 */
@media(min-width:769px) and (max-width:1024px){
  .hero h1{font-size:2.4rem}
  .read-card{padding:1.5rem}
  .sec{padding:4rem 0}
}