:root{
  --main:#64748b;
  --accent:#94a3b8;
  --bg:#f1f5f9;
  --text:#1e293b;
  --line:#cbd5e1;
  --soft:#e2e8f0;
  --mono:'Courier New',ui-monospace,monospace;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;scroll-padding-top:88px;}
body{
  margin:0;
  background-color:var(--bg);
  color:var(--text);
  font-family:'Inter',-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
  font-weight:400;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  background-image:
    linear-gradient(to right, rgba(148,163,184,.14) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(148,163,184,.14) 1px, transparent 1px);
  background-size:64px 64px;
}
h1,h2,h3,h4,h5{font-weight:900;letter-spacing:-0.02em;color:var(--text);}
a{text-decoration:none;color:var(--main);}
a:hover{color:var(--text);}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px;}

/* ---------- NAV ---------- */
.topbar{
  position:sticky;top:0;z-index:1000;
  background:rgba(241,245,249,.72);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
  transition:background .35s ease, box-shadow .35s ease, border-color .35s ease;
}
.topbar.scrolled{
  background:rgba(241,245,249,.97);
  box-shadow:0 1px 0 rgba(30,41,59,.08);
}
.nav-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:76px;max-width:1180px;margin:0 auto;padding:0 24px;
}
.brand{
  font-weight:900;font-size:1.16rem;letter-spacing:-.03em;color:var(--text);
  display:flex;align-items:center;gap:9px;white-space:nowrap;
}
.brand i{color:var(--main);font-size:.95rem;}
.nav-links{display:flex;align-items:center;gap:6px;}
.nav-links a{
  font-size:.92rem;font-weight:500;color:var(--main);
  padding:8px 12px;border-radius:2px;
  border-bottom:1px solid transparent;
  transition:color .2s, border-color .2s;
}
.nav-links a:hover,.nav-links a.active{color:var(--text);border-bottom-color:var(--text);}
.burger{
  display:none;background:none;border:1px solid var(--line);
  color:var(--text);width:42px;height:42px;border-radius:2px;
  font-size:1rem;cursor:pointer;
}
@media (max-width:900px){
  .burger{display:block;}
  .nav-links{
    position:absolute;top:76px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--bg);border-bottom:1px solid var(--line);
    max-height:0;overflow:hidden;transition:max-height .35s ease;
  }
  .nav-links.open{max-height:420px;}
  .nav-links a{padding:14px 24px;border-bottom:1px solid var(--soft);}
}

/* ---------- HERO ---------- */
.hero{
  position:relative;
  border-bottom:1px solid var(--line);
  overflow:hidden;
}
.hero-inner{
  max-width:1180px;margin:0 auto;padding:72px 24px 56px;
  display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:end;
}
.hero-eyebrow{
  font-family:var(--mono);font-size:.76rem;letter-spacing:.28em;
  text-transform:uppercase;color:var(--main);margin-bottom:22px;
}
.hero h1{
  font-size:clamp(2.4rem,6vw,4.6rem);
  line-height:.98;margin:0 0 26px;font-weight:900;
}
.hero h1 em{font-style:normal;color:var(--main);}
.hero-sub{
  font-size:1.02rem;color:#475569;max-width:34em;margin:0 0 30px;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;}
.btn-line{
  display:inline-flex;align-items:center;gap:9px;
  border:1px solid var(--text);color:var(--text);
  padding:12px 22px;font-size:.9rem;font-weight:600;border-radius:2px;
  transition:background .25s,color .25s;
  background:transparent;
}
.btn-line:hover{background:var(--text);color:var(--bg);}
.btn-line.solid{background:var(--text);color:var(--bg);}
.btn-line.solid:hover{background:var(--main);border-color:var(--main);color:#fff;}

.hero-figure{
  border:1px solid var(--line);
  background:linear-gradient(160deg,#ffffff 0%,#e9eef5 100%);
  padding:34px 30px;
  display:grid;grid-template-columns:1fr 1fr;gap:26px 20px;
  position:relative;
}
.hero-figure::before{
  content:"";position:absolute;inset:10px;border:1px dashed rgba(148,163,184,.5);
  pointer-events:none;
}
.stat{position:relative;z-index:1;}
.stat b{
  display:block;font-family:var(--mono);font-weight:700;
  font-size:clamp(1.9rem,4vw,2.9rem);line-height:1;color:var(--main);
  letter-spacing:-.04em;
}
.stat span{
  display:block;margin-top:8px;font-size:.78rem;letter-spacing:.12em;
  text-transform:uppercase;color:#64748b;
}
@media (max-width:900px){
  .hero-inner{grid-template-columns:1fr;padding:48px 24px 40px;gap:34px;}
}

/* ---------- SECTION BASE ---------- */
section{padding:78px 0;border-bottom:1px solid var(--line);}
.sec-head{margin-bottom:44px;}
.sec-num{
  font-family:var(--mono);font-size:.76rem;letter-spacing:.3em;
  color:var(--accent);display:block;margin-bottom:12px;
}
.sec-head h2{font-size:clamp(1.7rem,3.6vw,2.6rem);margin:0 0 14px;}
.sec-head p{color:#475569;max-width:44em;margin:0;font-size:.98rem;}

/* ---------- TIMELINE (使用说明) ---------- */
.timeline{position:relative;padding-left:34px;}
.timeline::before{
  content:"";position:absolute;left:6px;top:8px;bottom:8px;
  width:1px;background:var(--line);
}
.tl-item{position:relative;padding-bottom:42px;}
.tl-item:last-child{padding-bottom:0;}
.tl-item::before{
  content:"";position:absolute;left:-31px;top:9px;
  width:11px;height:11px;border-radius:50%;
  background:var(--bg);border:2px solid var(--main);
}
.tl-step{
  font-family:var(--mono);font-size:.76rem;letter-spacing:.18em;
  color:var(--accent);display:block;margin-bottom:8px;
}
.tl-item h3{font-size:1.18rem;margin:0 0 8px;}
.tl-item p{margin:0;color:#475569;font-size:.96rem;max-width:52em;}

/* ---------- TABS 特色网格 ---------- */
.tabbar{
  display:flex;flex-wrap:wrap;gap:0;
  border:1px solid var(--line);border-bottom:none;
}
.tabbtn{
  flex:1 1 140px;min-width:120px;
  background:transparent;border:none;border-right:1px solid var(--line);
  padding:16px 12px;font-size:.9rem;font-weight:600;color:var(--main);
  cursor:pointer;transition:background .22s,color .22s;font-family:inherit;
}
.tabbtn:last-child{border-right:none;}
.tabbtn:hover{background:var(--soft);color:var(--text);}
.tabbtn.active{background:var(--text);color:var(--bg);}
.tabpanel{display:none;}
.tabpanel.active{display:block;}
.cards{
  display:grid;grid-template-columns:repeat(3,1fr);
  border-left:1px solid var(--line);
}
.card{
  border:1px solid var(--line);border-left:none;
  padding:30px 26px;background:#fff;
  transition:transform .28s ease, box-shadow .28s ease, border-color .28s ease;
}
.card:hover{
  transform:translateY(-6px);
  box-shadow:0 14px 34px rgba(30,41,59,.14);
  border-color:var(--main);
  position:relative;z-index:2;
}
.card .ico{
  width:44px;height:44px;border:1px solid var(--line);border-radius:2px;
  display:flex;align-items:center;justify-content:center;
  color:var(--main);margin-bottom:18px;font-size:1rem;
}
.card h3{font-size:1.06rem;margin:0 0 10px;}
.card p{margin:0;font-size:.92rem;color:#475569;}
.card .num{
  font-family:var(--mono);font-size:.72rem;letter-spacing:.2em;
  color:var(--accent);display:block;margin-bottom:14px;
}
@media (max-width:900px){.cards{grid-template-columns:1fr;}}
@media (min-width:901px) and (max-width:1150px){.cards{grid-template-columns:repeat(2,1fr);}}

/* ---------- 长文分栏 ---------- */
.longtext{
  columns:2;column-gap:56px;column-rule:1px solid var(--line);
}
.longtext h3{
  break-after:avoid;font-size:1.14rem;margin:0 0 12px;
}
.longtext p{
  margin:0 0 20px;font-size:.96rem;color:#475569;break-inside:avoid;
}
.longtext .pullquote{
  break-inside:avoid;
  border-left:3px solid var(--main);
  padding:4px 0 4px 18px;margin:6px 0 24px;
  font-size:1.05rem;font-weight:600;color:var(--text);line-height:1.6;
}
@media (max-width:860px){
  .longtext{columns:1;column-rule:none;}
}

/* ---------- FAQ ---------- */
.faq-item{border-top:1px solid var(--line);}
.faq-item:last-child{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%;background:none;border:none;text-align:left;
  padding:24px 46px 24px 0;position:relative;
  font-size:1.02rem;font-weight:700;color:var(--text);
  cursor:pointer;font-family:inherit;line-height:1.6;
}
.faq-q i{
  position:absolute;right:4px;top:50%;transform:translateY(-50%);
  color:var(--main);font-size:.8rem;transition:transform .3s;
}
.faq-item.open .faq-q i{transform:translateY(-50%) rotate(180deg);}
.faq-a{
  max-height:0;overflow:hidden;transition:max-height .35s ease;
}
.faq-a p{
  margin:0;padding:0 46px 26px 0;font-size:.95rem;color:#475569;
}

/* ---------- CTA ---------- */
.cta{
  padding:82px 0;text-align:center;border-bottom:none;
  background:linear-gradient(180deg,rgba(203,213,225,.28),transparent);
}
.cta h2{
  font-size:clamp(1.9rem,4.4vw,3.1rem);margin:0 0 18px;line-height:1.08;
}
.cta p{color:#475569;max-width:38em;margin:0 auto 32px;font-size:1rem;}
.cta-actions{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;}

/* ---------- FRIEND LINKS & FOOTER ---------- */
.friendzone{
  padding:44px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  background:rgba(226,232,240,.35);
}
.friendzone h4{
  font-size:.8rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--main);margin:0 0 14px;font-weight:700;
}
.friendzone .flinks{font-size:.92rem;color:#475569;line-height:2;}
footer{padding:56px 0 40px;}
.foot-grid{
  display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;
}
.foot-brand{font-weight:900;font-size:1.1rem;margin-bottom:12px;color:var(--text);}
.foot-desc{font-size:.9rem;color:#64748b;max-width:26em;margin:0;}
.foot-col h5{
  font-size:.78rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--accent);margin:0 0 14px;font-weight:700;
}
.foot-col a,.foot-col span{
  display:block;font-size:.9rem;color:#475569;margin-bottom:9px;
}
.foot-col a:hover{color:var(--text);}
.copyright{
  margin-top:44px;padding-top:22px;border-top:1px solid var(--line);
  font-size:.83rem;color:#64748b;display:flex;flex-wrap:wrap;
  justify-content:space-between;gap:10px;
}
@media (max-width:800px){.foot-grid{grid-template-columns:1fr;gap:30px;}}

/* ---------- BACK TO TOP ---------- */
#toTop{
  position:fixed;right:22px;bottom:22px;z-index:1200;
  width:46px;height:46px;border-radius:2px;
  border:1px solid var(--text);background:rgba(241,245,249,.92);
  color:var(--text);font-size:.9rem;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  opacity:0;visibility:hidden;transform:translateY(12px);
  transition:opacity .3s,transform .3s,visibility .3s,background .25s,color .25s;
}
#toTop.show{opacity:1;visibility:visible;transform:translateY(0);}
#toTop:hover{background:var(--text);color:var(--bg);}

/* --- 子页面追加 --- */
.guide-hero {padding:56px 0 34px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,var(--soft),var(--bg));}
.guide-hero h1 {font-size:clamp(24px,3.4vw,38px);font-weight:800;line-height:1.28;margin:0 0 14px;letter-spacing:-.5px;}
.guide-hero p {max-width:760px;font-size:15.5px;line-height:1.85;color:#475569;margin:0;}
.guide-body {padding:44px 0 10px;}
.g-sec {margin-bottom:46px;}
.g-sec h2 {font-size:clamp(19px,2.3vw,25px);font-weight:800;margin:0 0 6px;letter-spacing:-.3px;}
.g-sec .g-sub {font-size:13.5px;color:var(--main);margin:0 0 18px;font-family:var(--mono);letter-spacing:.5px;}
.g-card {background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px 22px;}
.g-card h3 {font-size:16px;font-weight:700;margin:0 0 8px;}
.g-card p {font-size:14.5px;line-height:1.85;color:#475569;margin:0;}
.g-card ul {margin:10px 0 0;padding-left:18px;}
.g-card li {font-size:14.5px;line-height:1.9;color:#475569;}
.g-num {display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:6px;background:var(--main);color:#fff;font-size:13px;font-weight:700;margin-right:8px;font-family:var(--mono);}
.g-step {display:flex;gap:14px;padding:16px 0;border-bottom:1px dashed var(--line);}
.g-step:last-child {border-bottom:none;padding-bottom:0;}
.g-step:first-child {padding-top:0;}
.g-step-body h3 {font-size:15.5px;font-weight:700;margin:0 0 6px;}
.g-step-body p {font-size:14.5px;line-height:1.85;color:#475569;margin:0;}
.g-tag {display:inline-block;font-family:var(--mono);font-size:12px;color:var(--main);border:1px solid var(--line);border-radius:20px;padding:2px 10px;margin:0 6px 6px 0;background:var(--bg);}
.g-faq {border:1px solid var(--line);border-radius:10px;background:#fff;overflow:hidden;}
.g-faq details {border-bottom:1px solid var(--line);}
.g-faq details:last-child {border-bottom:none;}
.g-faq summary {cursor:pointer;list-style:none;padding:16px 20px;font-size:15px;font-weight:600;display:flex;justify-content:space-between;align-items:center;gap:12px;}
.g-faq summary::-webkit-details-marker {display:none;}
.g-faq summary::after {content:"+";font-family:var(--mono);font-size:18px;color:var(--main);flex:0 0 auto;}
.g-faq details[open] summary::after {content:"−";}
.g-faq .g-ans {padding:0 20px 18px;font-size:14.5px;line-height:1.9;color:#475569;}
.g-note {background:var(--soft);border-left:3px solid var(--main);border-radius:0 8px 8px 0;padding:14px 18px;font-size:14px;line-height:1.85;color:#475569;}
.g-meta {font-family:var(--mono);font-size:12.5px;color:var(--main);letter-spacing:.4px;}
.guide-hero {padding:38px 0 26px;}
.g-card {padding:16px 16px;}
.g-sec {margin-bottom:36px;}

/* --- 子页面追加 --- */
.about-lead {max-width:760px;line-height:1.9;font-size:1.02rem;color:var(--text);}
.about-lead strong {color:var(--text);font-weight:700;}
.about-figure {border:1px solid var(--line);background:var(--soft);padding:10px;}
.about-figure img {width:100%;display:block;aspect-ratio:16/10;object-fit:cover;}
.about-figure figcaption {font-family:var(--mono);font-size:.78rem;color:var(--main);padding-top:8px;letter-spacing:.02em;}
.value-card {background:#fff;border:1px solid var(--line);padding:22px 20px;height:100%;}
.value-card h3 {font-size:1.02rem;margin:0 0 10px;font-weight:700;color:var(--text);}
.value-card p {margin:0;font-size:.92rem;line-height:1.8;color:var(--main);}
.value-card .vc-num {font-family:var(--mono);font-size:.75rem;color:var(--accent);letter-spacing:.12em;display:block;margin-bottom:12px;}
.about-quote {border-left:3px solid var(--accent);padding:6px 0 6px 20px;margin:28px 0;font-size:1.05rem;line-height:1.85;color:var(--main);}
.about-quote span {display:block;font-family:var(--mono);font-size:.78rem;color:var(--accent);margin-top:10px;letter-spacing:.04em;}
.team-line {display:flex;flex-wrap:wrap;gap:10px;margin-top:18px;}
.team-chip {font-family:var(--mono);font-size:.78rem;border:1px solid var(--line);background:#fff;color:var(--main);padding:7px 13px;border-radius:999px;}
.about-lead {font-size:.96rem;}
.value-card {padding:18px 16px;}

/* --- 子页面追加 --- */
/* 本页专属少量补充样式 */
  .dis-wrap {max-width:1080px;margin:0 auto;padding:0 20px;}
.dis-hero {padding:64px 0 40px;border-bottom:1px solid var(--line);}
.dis-eyebrow {
    display:inline-block;font-family:var(--mono);font-size:12px;letter-spacing:.16em;
    text-transform:uppercase;color:var(--main);background:var(--soft);
    border:1px solid var(--line);border-radius:999px;padding:5px 14px;margin-bottom:18px;
  }
.dis-hero h1 {
    font-size:clamp(1.7rem,4vw,2.6rem);font-weight:800;line-height:1.22;
    letter-spacing:-.02em;margin:0 0 16px;color:var(--text);
  }
.dis-hero h1 span {color:var(--main);}
.dis-hero p {
    font-size:1rem;line-height:1.85;color:var(--main);max-width:760px;margin:0;
  }
.dis-meta {
    display:flex;flex-wrap:wrap;gap:10px 26px;margin-top:26px;
    font-family:var(--mono);font-size:12.5px;color:var(--accent);
  }
.dis-meta i {margin-right:6px;color:var(--main);}
.dis-sec {padding:46px 0;border-bottom:1px solid var(--line);}
.dis-sec:last-of-type {border-bottom:none;}
.dis-sec-num {
    font-family:var(--mono);font-size:12.5px;color:var(--accent);
    letter-spacing:.12em;margin-bottom:10px;
  }
.dis-sec h2 {
    font-size:clamp(1.15rem,2.4vw,1.5rem);font-weight:700;color:var(--text);
    margin:0 0 20px;letter-spacing:-.01em;line-height:1.35;
  }
.dis-sec h2::before {
    content:"";display:inline-block;width:8px;height:8px;border-radius:2px;
    background:var(--main);margin-right:12px;transform:translateY(-3px);
  }
.dis-sec p {font-size:.95rem;line-height:1.95;color:#334155;margin:0 0 15px;}
.dis-sec p:last-child {margin-bottom:0;}
.dis-sec strong {color:var(--text);font-weight:600;}
.dis-list {list-style:none;padding:0;margin:0;}
.dis-list li {
    position:relative;padding:14px 0 14px 30px;font-size:.94rem;line-height:1.9;
    color:#334155;border-bottom:1px dashed var(--line);
  }
.dis-list li:last-child {border-bottom:none;}
.dis-list li::before {
    content:"\f0da";font-family:"Font Awesome 6 Free";font-weight:900;
    position:absolute;left:0;top:14px;color:var(--accent);font-size:12px;
  }
.dis-list li b {color:var(--text);font-weight:600;}
.dis-note {
    background:#fff;border:1px solid var(--line);border-left:4px solid var(--main);
    border-radius:10px;padding:18px 22px;margin:22px 0 0;
    font-size:.9rem;line-height:1.9;color:var(--main);
  }
.dis-note i {color:var(--main);margin-right:8px;}
.dis-grid {display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:6px;}
.dis-cell {
    background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 22px;
  }
.dis-cell h3 {
    font-size:.98rem;font-weight:700;color:var(--text);margin:0 0 8px;
    display:flex;align-items:center;gap:9px;
  }
.dis-cell h3 i {color:var(--main);font-size:.95rem;}
.dis-cell p {font-size:.88rem;line-height:1.85;color:var(--main);margin:0;}
.dis-foot-note {
    margin-top:36px;padding:26px 0 60px;text-align:center;
    font-family:var(--mono);font-size:12.5px;color:var(--accent);line-height:2;
  }
.dis-foot-note a {color:var(--main);text-decoration:none;border-bottom:1px solid var(--line);}
.dis-foot-note a:hover {color:var(--text);border-bottom-color:var(--main);}
.dis-grid {grid-template-columns:1fr;}
.dis-hero {padding:44px 0 30px;}
.dis-sec {padding:34px 0;}