/* ============================================================
   dianzi-zhengshu.css —— 电子证书
   技法:上下双弧 hero(path) + 图文咬合 + 横向步骤条 +
   墨黑场景四卡 + 效力对照表 + 折叠 FAQ
   ============================================================ */

/* ---------- Hero:上下双弧 ---------- */
.dz-hero{
  margin-top:var(--nav-h);
  background:
    linear-gradient(100deg, rgba(74,55,40,.88), rgba(28,26,23,.7)),
    url("../images/scene-zizheng.jpg") center/cover no-repeat;
  color:var(--cream);
  padding:100px 0 120px;
  /* 顶部与底部各一个弧,形成两端柔化 */
  clip-path:ellipse(130% 100% at 50% 0);
}
.dz-hero-in{ max-width:820px; }
.dz-hero .crumb{ color:rgba(242,232,213,.72); margin-bottom:18px; }
.dz-hero .crumb a{ color:rgba(242,232,213,.85); }
.dz-keycap{ background:rgba(242,232,213,.12); border-color:var(--tan); color:var(--cream); margin-bottom:20px; }
.dz-hero h1{ color:var(--cream); font-size:38px; line-height:1.3; margin-bottom:20px; }
.dz-sub{ font-size:16.5px; line-height:1.9; color:rgba(242,232,213,.88); max-width:740px; }
.dz-cta{ margin-top:30px; display:flex; flex-wrap:wrap; gap:14px; }
.dz-ghost{ border-color:var(--tan); color:var(--cream); }
.dz-ghost:hover{ background:rgba(242,232,213,.1); color:var(--cream); border-color:var(--cream); }

/* ---------- 板块 2:是什么 ---------- */
.dz-what{ padding:80px 0; background:var(--paper); }
.dz-what-grid{ display:grid; grid-template-columns:1.1fr 1fr; gap:48px; align-items:center; }
.dz-secno{ font-family:var(--font-mono); letter-spacing:2px; color:var(--brown-3); font-size:13px; margin-bottom:10px; }
.dz-what-txt h2{ font-size:28px; margin-bottom:16px; }
.dz-what-txt p{ margin-bottom:14px; color:var(--ink-2); }
.dz-inlink{ color:var(--brown-2); text-decoration:underline; text-underline-offset:3px; }
.dz-what-img img{ border-radius:16px; box-shadow:var(--shadow); clip-path:polygon(0 0,100% 6%,96% 100%,0 94%); }

/* ---------- 板块 3:横向步骤条 ---------- */
.dz-flow{ padding:80px 0; background:var(--paper-2); }
.dz-flow h2{ font-size:28px; margin-bottom:30px; }
.dz-flow-row{ display:grid; grid-template-columns:repeat(4,1fr); gap:18px; counter-reset:dzstep; }
.dz-step{
  background:var(--paper); border:1px solid var(--line); border-radius:14px; padding:24px 20px;
  position:relative; box-shadow:var(--shadow-sm);
}
.dz-step-no{
  font-family:var(--font-mono); font-size:26px; font-weight:700; color:var(--line-2);
  display:block; margin-bottom:12px;
}
.dz-step h3{ font-size:17px; margin-bottom:8px; }
.dz-step p{ font-size:13.5px; color:var(--ink-2); }
.dz-flow-note{ margin-top:22px; font-size:12.5px; color:var(--brown-3); }

/* ---------- 板块 4:墨黑使用场景 ---------- */
.dz-use{ background:var(--ink); color:var(--cream); padding:80px 0; }
.dz-num-light{ font-family:var(--font-mono); letter-spacing:3px; color:var(--tan); font-size:13px; }
.dz-light-h{ color:var(--cream); font-size:29px; margin:8px 0 28px; }
.dz-use-row{ display:grid; grid-template-columns:repeat(4,1fr); gap:18px; }
.dz-use-i{ background:var(--ink-2); border:1px solid #3A342C; border-radius:12px; padding:22px 18px; }
.dz-use-i h3{ color:var(--tan); font-size:17px; margin-bottom:10px; }
.dz-use-i p{ color:rgba(242,232,213,.76); font-size:13.5px; }

/* ---------- 板块 5:效力对照表 ---------- */
.dz-vs{ padding:80px 0; background:var(--paper); }
.dz-vs h2{ font-size:28px; margin-bottom:24px; }
.dz-table-wrap{ border-radius:12px; overflow:hidden; box-shadow:var(--shadow-sm); }
.dz-tbl th{ font-size:14px; }
.dz-tbl td{ font-size:14px; }
.dz-tbl tbody tr:nth-child(even){ background:var(--paper-2); }
.dz-tbl tbody tr:last-child td{ background:var(--paper-3); font-weight:600; }

/* ---------- 板块 6:FAQ ---------- */
.dz-faq{ padding:80px 0; background:var(--paper-3); }
.dz-faq h2{ font-size:28px; margin-bottom:26px; }
.dz-faq-list{ max-width:860px; }
.dz-faq-i{ border:1px solid var(--line-2); border-radius:12px; margin-bottom:12px; background:var(--paper); overflow:hidden; }
.dz-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; }
.dz-faq-i summary::-webkit-details-marker{ display:none; }
.dz-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); }
.dz-faq-i[open] summary::after{ content:"–"; }
.dz-faq-i p{ padding:0 20px 18px; color:var(--ink-2); font-size:14.5px; }
.dz-faq-i a{ color:var(--brown-2); text-decoration:underline; text-underline-offset:3px; }

/* ---------- 板块 7:CTA ---------- */
.dz-cta{
  background:
    linear-gradient(120deg, rgba(74,55,40,.9), rgba(28,26,23,.88)),
    url("../images/scene-bangong.jpg") center/cover no-repeat;
  color:var(--cream); text-align:center; padding:80px 0;
}
.dz-cta h2{ color:var(--cream); font-size:29px; margin-bottom:14px; }
.dz-cta p{ color:rgba(242,232,213,.85); max-width:620px; margin:0 auto 26px; }
.dz-cta-row{ display:flex; justify-content:center; flex-wrap:wrap; gap:14px; }
.dz-cta-links{ margin-top:24px; font-size:13.5px; color:rgba(242,232,213,.72); }
.dz-cta-links a{ color:var(--tan); }

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .dz-hero{ clip-path:none; padding:70px 0 60px; }
  .dz-hero h1{ font-size:29px; }
  .dz-what-grid{ grid-template-columns:1fr; gap:28px; }
  .dz-flow-row,.dz-use-row{ grid-template-columns:1fr 1fr; }
}
@media (max-width:640px){
  .dz-hero h1{ font-size:24px; }
  .dz-what-txt h2,.dz-flow h2,.dz-vs h2,.dz-faq h2,.dz-light-h{ font-size:22px; }
  .dz-flow-row,.dz-use-row{ grid-template-columns:1fr; }
}

/* 表格列宽(由内联 col 迁移) */
.dz-tbl{table-layout:fixed;}
.dz-tbl col:nth-child(1){width:22%}
.dz-tbl col:nth-child(2){width:39%}
.dz-tbl col:nth-child(3){width:39%}

/* 常见误区 */
.dz-mis{padding:60px 0;background:var(--paper-2);}
.dz-mis h2{font-size:26px;margin-bottom:22px;}
.dz-mis-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.dz-mis-i{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:22px;display:flex;flex-direction:column;gap:8px;}
.dz-mis-i b{font-family:var(--font-head);color:var(--ink);}
.dz-mis-i span{font-size:13.5px;color:var(--ink-2);}
@media(max-width:1080px){.dz-mis-grid{grid-template-columns:1fr;}}

/* 操作步骤 */
.dz-step{padding:60px 0;background:var(--paper);}
.dz-step h2{font-size:26px;margin-bottom:16px;}
.dz-step>div>p{margin-bottom:14px;color:var(--ink-2);}
.dz-step b{color:var(--ink);}

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

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

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

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