/* ============================================================
   龙铭特种作业 · 钎焊作业 qianhan.css
   对角签名 S03：160° 渐变分割，左上深右下浅，内容居中，装饰=同心圆环
   ============================================================ */

/* ---------- 首屏 Hero（S03：160°） ---------- */
.hero{position:relative;min-height:92vh;display:flex;align-items:center;justify-content:center;overflow:hidden;background:var(--ink)}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 40%;opacity:.5;transform:scale(1.04)}
.hero-fade{
  position:absolute;inset:0;
  background:linear-gradient(160deg,rgba(11,11,12,.95) 0%,rgba(11,11,12,.8) 45%,rgba(11,11,12,.4) 75%,rgba(244,244,240,.8) 100%);
}
.hero-rings{position:absolute;right:8%;top:50%;transform:translateY(-50%);pointer-events:none}
.ring{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);border:1px solid rgba(255,255,255,.22);border-radius:50%}
.ring.r1{width:180px;height:180px}
.ring.r2{width:300px;height:300px;border-color:rgba(255,255,255,.16)}
.ring.r3{width:430px;height:430px;border-color:rgba(255,255,255,.1);border-style:dashed}
.hero-inner{position:relative;z-index:2;width:min(1200px,92%);margin-inline:auto;padding:150px 0 90px;display:flex;justify-content:center;text-align:center}
.hero-box{max-width:640px}
.hero-crumbs{margin-bottom:22px;justify-content:center}
.hero-crumbs{display:flex}
.hero-crumbs a{color:var(--muted-dark)}
.hero-crumbs a:hover{color:#fff}
.hero-flag{margin-bottom:24px;display:flex;justify-content:center}
.hero-title{font-size:clamp(34px,5.4vw,62px);line-height:1.18;font-weight:900;margin-bottom:22px}
.hero-title b{border-bottom:4px solid rgba(255,255,255,.4)}
.hero-lead{font-size:16.5px;color:var(--muted-dark);line-height:1.9;margin-bottom:34px;max-width:560px;margin-inline:auto}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap;justify-content:center}

/* ---------- 是什么（分栏） ---------- */
.what-sec{background:var(--paper);color:var(--txt-on-light)}
.what-sec .t-en{color:var(--muted-light)}
.split{display:grid;grid-template-columns:1fr 1.05fr;gap:56px;align-items:center}
.split-media img{width:100%;height:420px;object-fit:cover;border-radius:12px;box-shadow:0 30px 60px rgba(11,11,12,.2)}
.split-text .sec-title{margin-bottom:22px}
.split-text p{font-size:15.5px;color:#3a3a38;line-height:1.9;margin-bottom:14px}
.split-text a{color:#000;font-weight:700}

/* ---------- 三种焊接对比 ---------- */
.section-alt{background:var(--ink-2)}
.type-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.tc{position:relative;padding:32px 28px;border-radius:12px;background:var(--ink-3);border:1px solid var(--line);transition:.4s var(--ease);overflow:hidden}
.tc:hover{transform:translateY(-6px);border-color:rgba(255,255,255,.35)}
.tc-no{display:block;font-family:Georgia,serif;font-size:40px;font-weight:900;color:transparent;-webkit-text-stroke:1px rgba(255,255,255,.3);margin-bottom:18px;line-height:1}
.tc h3{font-size:19px;font-weight:800;margin-bottom:10px}
.tc p{font-size:14px;color:var(--muted-dark);line-height:1.85}

/* ---------- 考试内容 ---------- */
.exam-sec{background:var(--ink)}
.exam-pair{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.ep{background:var(--ink-3);border:1px solid var(--line);border-radius:12px;padding:34px 30px;transition:.35s var(--ease)}
.ep:hover{border-color:rgba(255,255,255,.3)}
.ep-tag{display:inline-block;font-size:12px;font-weight:800;letter-spacing:.14em;background:#fff;color:#000;padding:6px 16px;border-radius:999px;margin-bottom:18px}
.ep h3{font-size:19px;font-weight:800;margin-bottom:10px}
.ep p{font-size:14.5px;color:var(--muted-dark);line-height:1.9}

/* ---------- 报考条件 ---------- */
.cond-sec{background:var(--ink-2)}
.cond-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.cg{padding:26px 22px;border-radius:10px;background:var(--ink-3);border:1px solid var(--line);transition:.35s var(--ease)}
.cg:hover{border-color:rgba(255,255,255,.35);transform:translateY(-4px)}
.cg b{display:block;font-size:17px;margin-bottom:8px}
.cg p{font-size:13.5px;color:var(--muted-dark);line-height:1.8}

/* ---------- 材料清单 ---------- */
.mat-sec{background:var(--paper);color:var(--txt-on-light)}
.mat-sec .t-en{color:var(--muted-light)}
.mat-cols{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.mat-list{display:flex;flex-direction:column;gap:14px}
.mat-list li{display:flex;align-items:center;gap:12px;font-size:15px;color:#2a2a28}
.mat-list svg{width:20px;height:20px;flex:none;color:#000}

/* ---------- 适合谁 ---------- */
.fit-sec{background:var(--ink-2)}
.fit-tags{display:flex;flex-wrap:wrap;gap:14px}
.ft-tag{font-size:15px;font-weight:700;padding:14px 26px;border-radius:999px;border:1px solid var(--line);color:#e8e8e2;transition:.3s var(--ease);background:var(--ink-3)}
.ft-tag:hover{background:#fff;color:#000;border-color:#fff;transform:translateY(-3px)}

/* ---------- 常见问答 ---------- */
.faq-sec{background:var(--ink)}
.faq-list{max-width:860px}
.faq-item{border:1px solid var(--line);border-radius:10px;padding:22px 26px;margin-bottom:14px;background:var(--ink-2);transition:.3s}
.faq-item[open]{background:var(--ink-3);border-color:rgba(255,255,255,.25)}
.faq-item summary{font-size:16.5px;font-weight:800;cursor:pointer;list-style:none;position:relative;padding-right:30px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:2px;top:50%;transform:translateY(-50%);font-size:22px;color:var(--muted-dark)}
.faq-item[open] summary::after{transform:translateY(-50%) rotate(45deg);color:#fff}
.faq-item p{margin-top:14px;font-size:14.5px;color:var(--muted-dark);line-height:1.9}
.faq-item p a{color:#fff;text-decoration:underline}

/* ---------- CTA ---------- */
.cta-sec{background:var(--paper);color:var(--txt-on-light)}
.cta-strip{background:var(--ink);color:#fff;border-radius:18px;padding:54px 60px;display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap;position:relative;overflow:hidden}
.cta-strip::before{
  content:"";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  width:220px;height:220px;border-radius:50%;border:1px dashed rgba(255,255,255,.15);
}
.cta-strip h2{font-size:clamp(22px,2.8vw,32px);font-weight:900;margin-bottom:8px;position:relative}
.cta-strip p{color:var(--muted-dark);font-size:14.5px;position:relative}
.cta-btns{display:flex;gap:14px;position:relative;z-index:1;flex-wrap:wrap}

/* ---------- 响应式 ---------- */
@media (max-width:1280px){
  .type-grid{grid-template-columns:1fr 1fr}
  .cond-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:1024px){
  .split{grid-template-columns:1fr;gap:34px}
  .exam-pair{grid-template-columns:1fr}
  .mat-cols{grid-template-columns:1fr}
  .hero-rings{display:none}
}
@media (max-width:768px){
  .type-grid{grid-template-columns:1fr}
  .cta-strip{padding:38px 26px}
}
@media (max-width:480px){
  .cond-grid{grid-template-columns:1fr}
}

/* ---------- 工具类 ---------- */
.lnk-u{text-decoration:underline}
.cw-18{width:18%}.cw-22{width:22%}.cw-30{width:30%}.cw-34{width:34%}.cw-39{width:39%}

/* ---------- ③ 应用场景卡 ---------- */
.scene-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:10px}
.scene-card{position:relative;border-radius:12px;overflow:hidden;border:1px solid var(--line);display:flex;flex-direction:column}
.scene-card img{width:100%;height:220px;object-fit:cover;display:block}
.sc-body{padding:18px 20px;background:var(--ink-2)}
.sc-tag{display:inline-block;font-size:12px;letter-spacing:.1em;color:var(--muted-dark);border:1px solid var(--line);border-radius:999px;padding:4px 12px;margin-bottom:10px}
.sc-body h3{font-size:18px;font-weight:800;margin-bottom:8px;color:#fff}
.sc-body p{font-size:13.5px;color:var(--muted-dark);line-height:1.8}
.exam-note{margin-top:22px;font-size:14.5px;color:var(--muted-dark);max-width:860px}
.exam-note a{color:#fff}

@media (max-width:1024px){
  .scene-grid{grid-template-columns:1fr;gap:16px}
}