/* ============================================================
   liucheng.css —— 服务流程
   技法:纸面 hero + 竖向时间轴(grid三列) + 图文配合点 +
   墨黑承诺四卡 + 折叠 FAQ
   ============================================================ */

/* ---------- Hero ---------- */
.lc-hero{
  margin-top:var(--nav-h);
  background:
    linear-gradient(100deg, rgba(74,55,40,.9), rgba(28,26,23,.72)),
    url("../images/banner-about.jpg") center/cover no-repeat;
  color:var(--cream);
  padding:86px 0 100px;
  clip-path:polygon(0 0,100% 0,100% 80%,50% 100%,0 88%);
}
.lc-hero-in{ max-width:800px; }
.lc-hero .crumb{ color:rgba(242,232,213,.72); margin-bottom:18px; }
.lc-hero .crumb a{ color:rgba(242,232,213,.85); }
.lc-keycap{ background:rgba(242,232,213,.12); border-color:var(--tan); color:var(--cream); margin-bottom:20px; }
.lc-hero h1{ color:var(--cream); font-size:36px; line-height:1.3; margin-bottom:18px; }
.lc-sub{ font-size:16px; line-height:1.9; color:rgba(242,232,213,.88); max-width:720px; }
.lc-cta{ margin-top:28px; display:flex; flex-wrap:wrap; gap:14px; }
.lc-ghost{ border-color:var(--tan); color:var(--cream); }
.lc-ghost:hover{ background:rgba(242,232,213,.1); color:var(--cream); border-color:var(--cream); }

/* ---------- 板块 2:竖向时间轴 ---------- */
.lc-steps{ padding:70px 0; background:var(--paper); }
.lc-secno{ font-family:var(--font-mono); letter-spacing:2px; color:var(--brown-3); font-size:13px; margin-bottom:10px; }
.lc-steps h2{ font-size:28px; margin-bottom:34px; }
.lc-timeline{ max-width:900px; }
.lc-node{ display:grid; grid-template-columns:120px 40px 1fr; column-gap:10px; margin-bottom:6px; }
.lc-t-num{
  font-family:var(--font-mono); font-size:13px; color:var(--brown-2);
  justify-self:end; padding-top:20px; letter-spacing:1px;
}
.lc-t-axis{ position:relative; display:flex; justify-content:center; }
.lc-t-axis::before{ content:""; position:absolute; top:0; bottom:0; width:2px; background:var(--line-2); }
.lc-dot{
  width:16px; height:16px; border-radius:50%; background:var(--paper);
  border:3px solid var(--brown-3); align-self:start; margin-top:20px; position:relative; z-index:1;
}
.lc-t-body{
  background:var(--paper-2); border:1px solid var(--line); border-radius:12px;
  padding:18px 22px; margin-bottom:18px;
}
.lc-t-body h3{ font-size:17px; margin-bottom:8px; }
.lc-t-body p{ font-size:14px; color:var(--ink-2); }
.lc-inlink{ color:var(--brown-2); text-decoration:underline; text-underline-offset:3px; }

/* ---------- 板块 3:配合点 ---------- */
.lc-work{ padding:60px 0; background:var(--paper-2); }
.lc-work-grid{ display:grid; grid-template-columns:1fr 1.1fr; gap:48px; align-items:center; }
.lc-work-img img{ border-radius:16px; box-shadow:var(--shadow); clip-path:polygon(0 4%,100% 0,100% 96%,4% 100%); }
.lc-work-txt h2{ font-size:26px; margin:8px 0 16px; }
.lc-work-txt p{ margin-bottom:14px; color:var(--ink-2); }

/* ---------- 板块 4:墨黑承诺 ---------- */
.lc-promise{ background:var(--ink); color:var(--cream); padding:80px 0; }
.lc-num-light{ font-family:var(--font-mono); letter-spacing:3px; color:var(--tan); font-size:13px; }
.lc-light-h{ color:var(--cream); font-size:29px; margin:8px 0 28px; }
.lc-promise-row{ display:grid; grid-template-columns:repeat(4,1fr); gap:18px; }
.lc-p-i{ background:var(--ink-2); border:1px solid #3A342C; border-radius:12px; padding:22px 18px; display:flex; flex-direction:column; gap:10px; }
.lc-p-i b{ color:var(--tan); font-family:var(--font-head); font-size:16px; }
.lc-p-i span{ color:rgba(242,232,213,.76); font-size:13.5px; }
.lc-promise .lc-inlink{ color:var(--tan); }

/* ---------- 板块 5:FAQ ---------- */
.lc-faq{ padding:70px 0; background:var(--paper-3); }
.lc-faq h2{ font-size:27px; margin-bottom:26px; }
.lc-faq-list{ max-width:860px; }
.lc-faq-i{ border:1px solid var(--line-2); border-radius:12px; margin-bottom:12px; background:var(--paper); overflow:hidden; }
.lc-faq-i summary{ cursor:pointer; padding:16px 20px; font-weight:700; color:var(--ink); font-family:var(--font-head); list-style:none; position:relative; padding-right:40px; }
.lc-faq-i summary::-webkit-details-marker{ display:none; }
.lc-faq-i summary::after{ content:"+"; position:absolute; right:18px; top:50%; transform:translateY(-50%); font-family:var(--font-mono); font-size:20px; color:var(--brown-3); }
.lc-faq-i[open] summary::after{ content:"–"; }
.lc-faq-i p{ padding:0 20px 18px; color:var(--ink-2); font-size:14.5px; }
.lc-faq-i a{ color:var(--brown-2); text-decoration:underline; text-underline-offset:3px; }

/* ---------- 板块 6:CTA ---------- */
.lc-cta{
  background:
    linear-gradient(120deg, rgba(74,55,40,.9), rgba(28,26,23,.88)),
    url("../images/scene-zizheng.jpg") center/cover no-repeat;
  color:var(--cream); text-align:center; padding:80px 0;
}
.lc-cta h2{ color:var(--cream); font-size:29px; margin-bottom:14px; }
.lc-cta p{ color:rgba(242,232,213,.85); max-width:620px; margin:0 auto 26px; }
.lc-cta-row{ display:flex; justify-content:center; flex-wrap:wrap; gap:14px; }
.lc-cta-links{ margin-top:24px; font-size:13.5px; color:rgba(242,232,213,.72); }
.lc-cta-links a{ color:var(--tan); }

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .lc-hero{ clip-path:none; padding:70px 0 50px; }
  .lc-hero h1{ font-size:29px; }
  .lc-node{ grid-template-columns:1fr; }
  .lc-t-num{ justify-self:start; padding-top:0; margin-bottom:4px; }
  .lc-t-axis{ display:none; }
  .lc-work-grid{ grid-template-columns:1fr; gap:28px; }
  .lc-promise-row{ grid-template-columns:1fr 1fr; }
}
@media (max-width:640px){
  .lc-hero h1{ font-size:24px; }
  .lc-steps h2,.lc-faq h2,.lc-light-h{ font-size:22px; }
  .lc-promise-row{ grid-template-columns:1fr; }
}

/* 时间预期 */
.lc-time{padding:60px 0;background:var(--paper-2);}
.lc-time h2{font-size:26px;margin-bottom:14px;}
.lc-time>div>p{margin-bottom:14px;color:var(--ink-2);}
.lc-time-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:20px;}
.lc-time-i{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:20px;display:flex;flex-direction:column;gap:8px;}
.lc-time-i b{font-family:var(--font-head);color:var(--ink);}
.lc-time-i span{font-size:13.5px;color:var(--ink-2);}
.lc-time-i a{color:var(--brown-2);text-decoration:underline;}
.lc-time-note{margin-top:16px;font-size:12.5px;color:var(--brown-3);}
@media(max-width:640px){.lc-time-grid{grid-template-columns:1fr;}}

/* 客户差异 */
.lc-cust{padding:60px 0;background:var(--paper);}
.lc-cust h2{font-size:26px;margin-bottom:16px;}
.lc-cust>div>p{margin-bottom:14px;color:var(--ink-2);}
.lc-cust b{color:var(--ink);}

.lc-jie{padding:60px 0;background:var(--paper-2);}
.lc-jie h2{font-size:26px;margin-bottom:16px;}
.lc-jie>div>p{margin-bottom:14px;color:var(--ink-2);}

.lc-end3{padding:60px 0;background:var(--paper);}
.lc-end3 h2{font-size:26px;margin-bottom:16px;}
.lc-end3>div>p{margin-bottom:14px;color:var(--ink-2);}

.lc-chang{padding:60px 0;background:var(--paper-2);}
.lc-chang h2{font-size:26px;margin-bottom:16px;}
.lc-chang>div>p{margin-bottom:14px;color:var(--ink-2);}

.lc-pei{padding:60px 0;background:var(--paper);}
.lc-pei h2{font-size:26px;margin-bottom:16px;}
.lc-pei>div>p{margin-bottom:14px;color:var(--ink-2);}