/* 快答客服官网 —— 高级企业风：深蓝夜幕 hero + 光效 + 精致细节 */
:root{
  --blue:#3b82f6; --blue-d:#2563eb; --cyan:#22d3ee; --violet:#8b5cf6;
  --ink:#0b1220; --ink2:#1e293b; --dim:#64748b; --dim2:#94a3b8;
  --line:#e2e8f0; --gray:#f6f8fb;
  --serif:"Georgia","Times New Roman",serif;
  --sans:-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
  --mono:"SF Mono",Consolas,Menlo,monospace;
  --radius:18px;
  --shadow-lg:0 24px 80px -16px rgba(15,23,42,.18);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink2);font-size:15px;line-height:1.75;background:#fff;-webkit-font-smoothing:antialiased}
a{text-decoration:none}
::selection{background:rgba(59,130,246,.22)}

/* ============ 导航 ============ */
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.82);backdrop-filter:blur(14px);border-bottom:1px solid rgba(226,232,240,.9)}
.nav-in{max-width:1140px;margin:0 auto;padding:0 16px;height:66px;display:flex;align-items:center;justify-content:space-between;gap:10px;min-width:0}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;color:var(--ink);letter-spacing:.3px;min-width:0}
.logo span.logo-text{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.logo-mark{width:36px;height:36px;border-radius:11px;background:linear-gradient(135deg,var(--blue),var(--violet));color:#fff;display:flex;align-items:center;justify-content:center;font-size:15px;box-shadow:0 6px 16px rgba(37,99,235,.35)}
.nav-links{display:flex;gap:30px;font-size:14px}
.nav-links a{color:var(--dim);position:relative;transition:color .18s}
.nav-links a:hover{color:var(--ink)}
.nav-links a:not(.btn)::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:linear-gradient(90deg,var(--blue),var(--cyan));transition:width .22s;border-radius:1px}
.nav-links a:hover::after{width:100%}
.nav-cta{display:flex;gap:10px;align-items:center}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:11px;font-size:14px;font-weight:500;padding:10px 22px;cursor:pointer;border:1px solid transparent;transition:transform .18s,box-shadow .18s,background .18s;letter-spacing:.2px}
.btn.primary{background:linear-gradient(135deg,var(--blue-d),var(--blue));color:#fff;box-shadow:0 8px 22px rgba(37,99,235,.35)}
.btn.primary:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(37,99,235,.45)}
.btn.ghost{border-color:var(--line);color:var(--ink2);background:rgba(255,255,255,.7)}
.btn.ghost:hover{border-color:var(--blue);color:var(--blue-d);transform:translateY(-2px)}
.btn.big{padding:14px 32px;font-size:15px;border-radius:13px}
.btn.light{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.25);color:#fff;backdrop-filter:blur(6px)}
.btn.light:hover{background:rgba(255,255,255,.18);transform:translateY(-2px)}

/* ============ Hero：深色夜幕 ============ */
.hero{position:relative;background:var(--ink);color:#fff;overflow:hidden;padding:110px 24px 130px}
/* 网格底纹 */
.hero:before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(148,163,184,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(148,163,184,.06) 1px,transparent 1px);background-size:56px 56px;mask-image:radial-gradient(ellipse 90% 70% at 50% 0%,#000 40%,transparent 100%);-webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 0%,#000 40%,transparent 100%)}
/* 光效 */
.hero .glow{position:absolute;border-radius:50%;filter:blur(90px);opacity:.5;pointer-events:none}
.hero .glow.g1{width:560px;height:560px;background:rgba(37,99,235,.55);top:-220px;left:8%}
.hero .glow.g2{width:460px;height:460px;background:rgba(139,92,246,.4);bottom:-180px;right:5%}
.hero .glow.g3{width:380px;height:380px;background:rgba(34,211,238,.25);top:20%;right:28%}
.hero-in{position:relative;max-width:920px;margin:0 auto;text-align:center;z-index:1}
.hero-badge{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;color:#a5f3fc;background:rgba(34,211,238,.08);border:1px solid rgba(34,211,238,.25);border-radius:999px;padding:6px 16px;margin-bottom:30px;letter-spacing:1.5px}
.hero-badge .dot{width:6px;height:6px;border-radius:50%;background:#34d399;box-shadow:0 0 8px #34d399;animation:pulse 2.2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.hero h1{font-size:52px;line-height:1.22;font-weight:700;letter-spacing:1px}
.hero h1 em{font-style:normal;background:linear-gradient(120deg,#7db4ff 0%,#67e8f9 55%,#b7a5fc 100%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;filter:drop-shadow(0 0 22px rgba(103,232,249,.35))}
.lead{margin:24px auto 40px;color:#b6c5da;font-size:17px;max-width:560px}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-feats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;max-width:860px;margin:56px auto 0}
.feat{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:14px;padding:20px 18px;text-align:left;backdrop-filter:blur(8px);transition:border-color .2s,background .2s,transform .2s;box-shadow:0 12px 32px rgba(2,6,17,.35)}
.feat:hover{background:rgba(255,255,255,.09);border-color:rgba(96,165,250,.45);transform:translateY(-3px)}
.feat .f-ico{font-size:20px;display:block}
.feat b{display:block;font-size:14.5px;margin-top:8px;color:#fff}
.feat i{font-style:normal;font-size:12.5px;color:#a8b8cd}

/* ============ 产品模拟窗 ============ */
.mock{position:relative;max-width:820px;margin:64px auto 0;background:#fff;border-radius:var(--radius);box-shadow:0 40px 100px -20px rgba(0,0,0,.55),0 0 0 1px rgba(255,255,255,.08);overflow:hidden;text-align:left;color:var(--ink2);animation:floaty 7s ease-in-out infinite}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
.mock-bar{background:#f1f5f9;padding:12px 16px;display:flex;align-items:center;gap:7px;border-bottom:1px solid var(--line)}
.mock-bar span{width:12px;height:12px;border-radius:50%}
.mock-bar span:nth-child(1){background:#f87171}.mock-bar span:nth-child(2){background:#fbbf24}.mock-bar span:nth-child(3){background:#34d399}
.mock-bar i{font-style:normal;margin-left:12px;font-size:12px;color:var(--dim2);background:#fff;border:1px solid var(--line);border-radius:8px;padding:4px 16px;font-family:var(--mono)}
.mock-body{padding:24px 26px}
.mock-row{display:flex;gap:12px;align-items:center;margin-bottom:16px}
.m-badge{font-size:11.5px;padding:3px 12px;border-radius:999px;background:#fef3c7;color:#b45309;font-weight:500}
.m-main b{display:block;font-size:15.5px;color:var(--ink)}
.m-main i{font-style:normal;font-size:12px;color:var(--dim2);font-family:var(--mono)}
.mock-steps{display:flex;max-width:480px;margin:6px 0 20px}
.mock-steps span{flex:1;font-size:11.5px;color:var(--dim2);border-top:3px solid var(--line);padding-top:8px;margin-right:4px;transition:.3s}
.mock-steps span.on{border-color:var(--blue);color:var(--blue-d)}
.mock-steps span.cur{font-weight:700;color:var(--ink)}
.mock-msgs .mm{border:1px solid var(--line);border-radius:13px;padding:11px 15px;margin-bottom:10px;font-size:13.5px;background:var(--gray);max-width:86%;line-height:1.65}
.mock-msgs .mm.me{background:linear-gradient(135deg,#eff6ff,#e0f2fe);border-color:#bfdbfe;margin-left:auto}
.mock-msgs .mm i{display:block;font-size:11px;color:var(--dim2);font-style:normal;margin-bottom:4px}

/* ============ 通用 section ============ */
.section{padding:96px 24px}
.section.alt{background:var(--gray)}
.sec-in{max-width:1140px;margin:0 auto}
.sec-head{text-align:center;margin-bottom:56px}
.kicker{display:inline-block;color:var(--blue-d);font-size:12px;letter-spacing:4px;font-weight:700;font-family:var(--mono);background:linear-gradient(90deg,rgba(37,99,235,.1),rgba(139,92,246,.1));padding:5px 16px;border-radius:999px;border:1px solid rgba(37,99,235,.15)}
.sec-head h2{font-size:34px;margin-top:16px;color:var(--ink);letter-spacing:.5px}

/* 步骤 */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px 26px;position:relative;transition:transform .22s,box-shadow .22s}
.step:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.step i{font-style:normal;width:44px;height:44px;border-radius:13px;background:linear-gradient(135deg,rgba(37,99,235,.12),rgba(139,92,246,.12));border:1px solid rgba(37,99,235,.2);color:var(--blue-d);font-weight:700;font-size:15px;font-family:var(--mono);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.step h3{font-size:17px;margin-bottom:10px;color:var(--ink)}
.step p{color:var(--dim);font-size:13.5px}

/* 行业 */
.b-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.b-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;transition:transform .22s,box-shadow .22s,border-color .22s}
.b-item:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:rgba(59,130,246,.35)}
.b-item b{font-size:15px;color:var(--ink);display:flex;align-items:center;gap:8px}
.b-item p{color:var(--dim);font-size:13px;margin-top:8px}

/* 数据带 */
.stats-band{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:44px;background:linear-gradient(135deg,var(--ink),#16233c);border-radius:var(--radius);padding:40px 28px;position:relative;overflow:hidden}
.stats-band:before{content:"";position:absolute;width:300px;height:300px;border-radius:50%;background:rgba(37,99,235,.35);filter:blur(70px);top:-120px;left:-60px}
.stats-band:after{content:"";position:absolute;width:240px;height:240px;border-radius:50%;background:rgba(139,92,246,.3);filter:blur(70px);bottom:-100px;right:-40px}
.sb{text-align:center;position:relative;z-index:1}
.sb b{display:block;font-size:36px;color:#fff;font-weight:700;font-family:var(--serif);letter-spacing:1px}
.sb b em{font-style:normal;font-size:20px;background:linear-gradient(120deg,#7db4ff,#67e8f9);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.sb i{font-style:normal;font-size:13px;color:#aab9cf}

/* ============ CTA ============ */
.cta{background:var(--ink);color:#fff;padding:110px 24px;text-align:center;position:relative;overflow:hidden}
.cta:before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(148,163,184,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(148,163,184,.05) 1px,transparent 1px);background-size:56px 56px;mask-image:radial-gradient(ellipse 80% 90% at 50% 100%,#000 30%,transparent 100%);-webkit-mask-image:radial-gradient(ellipse 80% 90% at 50% 100%,#000 30%,transparent 100%)}
.cta .glow{position:absolute;width:520px;height:520px;border-radius:50%;background:rgba(37,99,235,.4);filter:blur(100px);top:-260px;left:50%;transform:translateX(-50%);pointer-events:none}
.cta h2{font-size:32px;position:relative;letter-spacing:1px}
.cta h2 em{font-style:normal;background:linear-gradient(120deg,#7db4ff,#67e8f9);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;filter:drop-shadow(0 0 18px rgba(103,232,249,.3))}
.cta p{color:#b6c5da;margin:14px 0 36px;position:relative}
.cta .hero-actions{position:relative}

/* ============ footer ============ */
.footer{border-top:1px solid var(--line);padding:52px 24px 34px;background:#fff}
.f-cols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px;max-width:1140px;margin:0 auto}
.f-cols b{font-size:15px;color:var(--ink)}
.f-cols p{color:var(--dim);font-size:13px;margin-top:10px;line-height:1.8}
.f-cols a{display:block;color:var(--dim);font-size:13.5px;margin-top:9px;transition:color .18s}
.f-cols a:hover{color:var(--blue-d)}
.f-bottom{max-width:1140px;margin:30px auto 0;border-top:1px solid var(--line);padding-top:22px;text-align:center;color:var(--dim2);font-size:12.5px;letter-spacing:.3px}

/* ============ 响应式 ============ */
@media (max-width:960px){
  .hero h1{font-size:38px}
  .hero-feats,.steps,.b-grid,.stats-band{grid-template-columns:1fr 1fr}
  .sec-head h2{font-size:27px}
  .f-cols{grid-template-columns:1fr}
  .nav-links{display:none}
}
@media (max-width:600px){
  .hero{padding:80px 20px 90px}
  .hero h1{font-size:26px}
  .lead{font-size:15px;margin:18px auto 28px}
  .hero-badge{font-size:10.5px;letter-spacing:1px;padding:5px 12px;margin-bottom:22px}
  .hero-feats,.steps,.b-grid,.stats-band{grid-template-columns:1fr}
  .feat{padding:15px 14px}
  .feat b{font-size:13.5px}
  .feat i{font-size:12px}
  .hero-feats{gap:10px;margin-top:36px}
  .btn.big{width:100%;padding:11px 20px;font-size:13.5px;border-radius:11px}
  /* 导航：允许换行，Logo 文字可截断，按钮变小 */
  .nav-in{height:auto;min-height:56px;padding:8px 14px;flex-wrap:wrap;gap:8px}
  .logo{font-size:15px;flex-shrink:1}
  .logo-mark{width:30px;height:30px;border-radius:9px;font-size:13px}
  .nav-cta{margin-left:auto;gap:8px;flex-wrap:wrap}
  .nav-cta .btn{padding:7px 12px;font-size:12.5px;border-radius:9px;white-space:nowrap}
  .section{padding:56px 20px}
  .sec-head h2{font-size:22px}
  .sec-head{margin-bottom:36px}
  .sb b{font-size:26px}
  .stats-band{padding:28px 18px;gap:20px}
  .mock{animation:none}
  .mock-body{padding:16px}
  .step{padding:22px 18px}
  .b-item{padding:20px 16px}
  .cta{padding:72px 20px}
  .cta h2{font-size:23px}
}