/* ===== 知学研途 · 网页端 设计系统（顶级设计质感：通透 · 光感 · 层级 · 转化） ===== */
:root{
  --bg:#F6F7F9;
  --card:#FFFFFF;
  --ink:#17181C;
  --ink-2:#5B6470;
  --ink-3:#9AA1AB;
  --line:#EBECF0;
  --primary:#0CA678;
  --primary-d:#0B9468;
  --primary-soft:#E7F8F2;
  --accent:#F59E0B;
  --sh-sm:0 2px 10px rgba(23,24,28,.05);
  --sh-md:0 10px 28px rgba(23,24,28,.08);
  --sh-lg:0 20px 48px rgba(23,24,28,.12);
  --radius:22px;
  --radius-sm:16px;
  --maxw:1000px;
  --pad:24px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Helvetica Neue",Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.6;
  -webkit-font-smoothing:antialiased;
  padding-bottom:0;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}

/* ===== 顶部导航 ===== */
.nav{position:sticky;top:0;z-index:50;background:rgba(246,247,249,.8);
  backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid var(--line)}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:0 var(--pad);height:58px;
  display:flex;align-items:center;gap:22px}
.brand{font-size:19px;font-weight:800;letter-spacing:.2px;display:flex;align-items:center;gap:8px}
.brand-dot{width:12px;height:12px;border-radius:4px;background:linear-gradient(135deg,#34D399,#0CA678);box-shadow:var(--sh-sm)}
.nav-links{display:flex;gap:28px;margin-left:6px}
.nav-links a{font-size:15px;color:var(--ink-2);transition:color .2s}
.nav-links a:hover{color:var(--ink)}
.nav-cta{margin-left:auto}

/* ===== 按钮 ===== */
.btn-primary{background:linear-gradient(135deg,#12B886,#0CA678);color:#fff;border:none;cursor:pointer;
  font-size:16px;font-weight:700;padding:14px 28px;border-radius:999px;letter-spacing:.3px;
  box-shadow:0 8px 20px rgba(12,166,120,.30);
  transition:transform .12s ease,box-shadow .2s,filter .2s}
.btn-primary:hover{filter:brightness(1.04);box-shadow:0 12px 26px rgba(12,166,120,.36)}
.btn-primary:active{transform:scale(.96)}
.btn-ghost{display:inline-block;background:#fff;color:var(--ink);font-weight:600;font-size:16px;
  padding:14px 28px;border-radius:999px;border:1.5px solid var(--line);cursor:pointer;
  transition:transform .12s ease,border-color .2s,background .2s}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary-d);background:var(--primary-soft)}
.btn-ghost:active{transform:scale(.96)}

/* ===== 区块 ===== */
.block{max-width:var(--maxw);margin:0 auto;padding:72px var(--pad) 40px}
.block-head{text-align:center;margin-bottom:40px}
.eyebrow{font-size:12px;letter-spacing:3px;font-weight:800;color:var(--primary);
  text-transform:uppercase;margin-bottom:10px}
.block-head h2{font-size:32px;font-weight:800;letter-spacing:-.5px}
.block-sub{color:var(--ink-2);font-size:15px;margin-top:10px}

/* ===== Hero ===== */
.hero{position:relative;max-width:var(--maxw);margin:0 auto;padding:84px var(--pad) 20px;overflow:visible}
.hero-glow{position:absolute;top:-120px;left:50%;transform:translateX(-50%);
  width:900px;height:560px;pointer-events:none;
  background:radial-gradient(closest-side,rgba(52,211,153,.20),rgba(56,189,248,.10) 55%,transparent 70%);
  filter:blur(10px)}
.hero-card{position:relative;background:var(--card);border-radius:28px;box-shadow:var(--sh-md);
  border:1px solid rgba(235,236,240,.8);padding:52px 28px 44px;text-align:center}
.hero-av{width:132px;height:132px;border-radius:50%;overflow:hidden;margin:0 auto;position:relative;
  box-shadow:0 0 0 5px #fff,0 14px 34px rgba(12,166,120,.22)}
.hero-av img{width:100%;height:100%;object-fit:cover}
.hero-badge{display:inline-flex;align-items:center;gap:8px;margin-top:20px;font-size:13px;
  color:var(--primary-d);background:var(--primary-soft);padding:6px 16px;border-radius:999px;font-weight:700}
.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:#2FBF71;box-shadow:0 0 0 3px rgba(47,191,113,.2)}
.hero-slogan{margin-top:18px;font-size:15px;font-weight:700;letter-spacing:1px;
  background:linear-gradient(135deg,#0CA678,#0EA5E9);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-name{font-size:36px;font-weight:800;margin-top:6px;letter-spacing:-.5px}
.hero-head{color:var(--ink-2);font-size:16px;margin-top:6px}
.hero-sum{max-width:600px;margin:16px auto 0;color:var(--ink-2);font-size:16px}

.stats{display:flex;justify-content:center;gap:14px;flex-wrap:wrap;margin:30px 0 32px}
.stat{min-width:118px;background:var(--bg);border:1px solid var(--line);border-radius:18px;padding:16px 10px}
.stat-num{font-size:24px;font-weight:800;letter-spacing:-.5px;
  background:linear-gradient(135deg,#0CA678,#0B9468);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat-label{font-size:12px;color:var(--ink-3);margin-top:4px;font-weight:600}

.hero-ctas{display:flex;justify-content:center;gap:14px;flex-wrap:wrap}

/* ===== 服务卡片 ===== */
.sv-grid{display:grid;grid-template-columns:1fr;gap:18px}
.sv-card{position:relative;background:var(--card);border-radius:var(--radius);box-shadow:var(--sh-sm);
  padding:26px;cursor:pointer;border:1px solid rgba(235,236,240,.7);
  transition:transform .18s ease,box-shadow .25s}
.sv-card:hover{transform:translateY(-4px);box-shadow:var(--sh-md)}
.sv-hot{position:absolute;top:16px;right:16px;background:linear-gradient(135deg,#FBBF24,#F59E0B);
  color:#fff;font-size:11px;font-weight:800;padding:4px 12px;border-radius:999px;letter-spacing:.5px;
  box-shadow:0 4px 10px rgba(245,158,11,.35)}
.sv-top{display:flex;align-items:center;gap:16px}
.sv-ic{width:58px;height:58px;border-radius:16px;color:#fff;display:flex;align-items:center;justify-content:center;
  font-size:26px;font-weight:800;flex:0 0 auto;box-shadow:var(--sh-sm)}
.sv-name{font-size:19px;font-weight:800}
.sv-tag{color:var(--ink-2);font-size:14px;margin-top:2px}
.sv-intro{color:var(--ink-2);font-size:14px;margin-top:14px;line-height:1.6}
.sv-line{height:1px;background:var(--line);margin:18px 0}
.sv-meta{display:flex;justify-content:space-between;align-items:center}
.sv-price{font-size:14px;color:var(--ink-2)}
.sv-price b{font-size:20px;font-weight:800}
.sv-go{color:var(--primary-d);font-size:14px;font-weight:700}

/* ===== 关于我 ===== */
.about-sum{max-width:700px;margin:0 auto 34px;text-align:center;color:var(--ink-2);font-size:17px}
.facts{display:grid;grid-template-columns:1fr;gap:16px}
.fact{display:flex;gap:16px;background:var(--card);border-radius:var(--radius-sm);
  box-shadow:var(--sh-sm);padding:20px;border:1px solid rgba(235,236,240,.7)}
.fact-ic{width:48px;height:48px;border-radius:14px;color:#fff;display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:20px;flex:0 0 auto;box-shadow:var(--sh-sm)}
.fact-t{font-size:16px;font-weight:800;margin-bottom:4px}
.fact-d{color:var(--ink-2);font-size:14px;line-height:1.6}
.traits{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin:28px 0}
.trait{font-size:14px;color:var(--primary-d);background:var(--primary-soft);
  padding:8px 18px;border-radius:999px;font-weight:700}
.motto{text-align:center;color:var(--ink-2);font-size:16px;margin:6px 0 28px;font-style:italic}
.about-cta{display:block;margin:0 auto}

/* ===== 评价 ===== */
.rv-grid{display:grid;grid-template-columns:1fr;gap:18px}
.rv-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--sh-sm);
  padding:26px;border:1px solid rgba(235,236,240,.7)}
.rv-stars{color:var(--accent);display:flex;gap:3px;margin-bottom:14px}
.rv-stars svg{width:17px;height:17px}
.rv-txt{font-size:15px;color:var(--ink);line-height:1.7}
.rv-name{margin-top:16px;font-size:14px;color:var(--ink-3);font-weight:700}

/* ===== 页脚 ===== */
.foot{background:#fff;border-top:1px solid var(--line);margin-top:48px}
.foot-inner{max-width:var(--maxw);margin:0 auto;padding:52px var(--pad);text-align:center}
.foot-brand{font-size:20px;font-weight:800;display:inline-flex;align-items:center;gap:8px}
.foot-line{color:var(--ink-2);font-size:14px;margin:10px 0 24px}
.foot-wx{display:inline-flex;gap:18px;align-items:center;text-align:left;
  background:var(--bg);border:1px solid var(--line);border-radius:var(--radius-sm);padding:18px 22px}
.foot-qr{width:100px;height:100px;border-radius:12px}
.foot-wxid{font-weight:800;font-size:16px}
.foot-tip{color:var(--ink-2);font-size:13px;margin-top:4px}
.foot-copy{color:var(--ink-3);font-size:12px;margin-top:28px}

/* ===== 吸底咨询条（移动端） ===== */
.dock-cta{display:none;position:fixed;left:16px;right:16px;bottom:16px;z-index:60;
  background:linear-gradient(135deg,#12B886,#0CA678);color:#fff;border:none;cursor:pointer;
  font-size:17px;font-weight:800;padding:16px;border-radius:999px;letter-spacing:.5px;
  box-shadow:0 12px 28px rgba(12,166,120,.40)}
.dock-cta:active{transform:scale(.98)}

/* ===== 弹层 ===== */
.mask{position:fixed;inset:0;background:rgba(23,24,28,.5);z-index:100;
  display:none;align-items:center;justify-content:center;padding:20px;
  opacity:0;transition:opacity .2s;backdrop-filter:blur(3px)}
.mask.show{display:flex;opacity:1}
.sheet{background:#fff;border-radius:26px;box-shadow:var(--sh-lg);
  width:100%;max-width:360px;padding:32px 26px 28px;position:relative;
  text-align:center;transform:translateY(14px) scale(.98);transition:transform .28s cubic-bezier(.2,.9,.3,1.2)}
.mask.show .sheet{transform:translateY(0) scale(1)}
.sheet-close{position:absolute;top:14px;right:16px;border:none;background:none;
  font-size:28px;line-height:1;color:var(--ink-3);cursor:pointer}
.sheet-av{width:76px;height:76px;border-radius:50%;overflow:hidden;margin:0 auto 12px;
  box-shadow:0 0 0 4px #fff,var(--sh-md)}
.sheet-title{font-size:22px;font-weight:800}
.sheet-sub{color:var(--ink-2);font-size:14px;margin-top:6px}
.qr-box{margin:20px auto;width:204px;height:204px;border-radius:16px;overflow:hidden;
  border:1px solid var(--line);box-shadow:var(--sh-sm)}
.qr-box img{width:100%;height:100%;object-fit:cover}
.wxid-row{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:12px}
.wxid{font-size:18px;font-weight:800;letter-spacing:.5px}
.btn-copy{background:var(--primary-soft);color:var(--primary-d);border:none;
  font-weight:700;font-size:14px;padding:8px 18px;border-radius:999px;cursor:pointer}
.qr-tip{color:var(--ink-3);font-size:12px}

/* 服务详情弹层 */
.sv-sheet{max-width:400px;text-align:left;max-height:86vh;overflow-y:auto}
.sv-sheet .sheet-title,.sv-sheet .sheet-sub{text-align:center}
.sv-sheet .sv-ic{margin:0 auto 12px;width:64px;height:64px;font-size:28px}
.sv-intro{color:var(--ink-2);font-size:15px;margin:14px 0 18px;line-height:1.7}
.sv-sec{margin-bottom:16px}
.sv-sec-t{font-size:14px;font-weight:800;color:var(--ink);
  padding-left:12px;border-left:3px solid var(--primary);margin-bottom:10px}
.sv-list{list-style:none;display:flex;flex-direction:column;gap:8px}
.sv-list li{position:relative;padding-left:20px;color:var(--ink-2);font-size:14px}
.sv-list li::before{content:"";position:absolute;left:4px;top:9px;width:6px;height:6px;
  border-radius:50%;background:var(--primary)}
.sv-suitable{color:var(--ink-2);font-size:14px}
.sv-fee{background:var(--bg);border-radius:var(--radius-sm);padding:14px 16px;
  font-size:15px;font-weight:600;margin:6px 0 12px;color:var(--ink)}
.sv-fee b{color:var(--primary-d);font-size:18px}
.sv-note{color:var(--ink-3);font-size:13px;margin-bottom:18px}
.sv-cta{width:100%}

/* ===== 响应式 ===== */
@media (min-width:640px){
  .sv-grid{grid-template-columns:1fr 1fr}
  .facts{grid-template-columns:1fr 1fr}
  .rv-grid{grid-template-columns:1fr 1fr 1fr}
}
@media (max-width:768px){
  body{padding-bottom:84px}
  .dock-cta{display:block}
}
@media (max-width:560px){
  .nav-links{display:none}
  .nav-cta{padding:11px 18px;font-size:14px}
  .block{padding:52px var(--pad) 32px}
  .block-head h2{font-size:27px}
  .hero{padding-top:56px}
  .hero-name{font-size:32px}
  .stat{min-width:100px;padding:14px 8px}
}