/* ============================================================
   fangbao.html 防爆电气页独有样式
   前缀 fb-
   ============================================================ */

/* ---------- Hero：Ex 标志图解 + 分区渐变带 ---------- */
.fb-hero{position:relative;background:var(--c1);overflow:hidden;padding:calc(var(--header-h) + 48px) 0 0}
.fb-hero::before{content:"";position:absolute;top:0;left:0;width:60%;height:100%;background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);background-size:38px 38px}
.fb-hero__grid{position:relative;z-index:2;display:grid;grid-template-columns:1.15fr 1fr;gap:48px;align-items:center;padding-bottom:54px}
.fb-kicker{display:inline-block;font-family:var(--font-en);font-size:12px;letter-spacing:.26em;color:var(--o2);border-left:3px solid var(--o1);padding-left:14px}
.fb-hero h1{font-size:clamp(30px,4.6vw,52px);font-weight:900;line-height:1.18;margin:20px 0 18px}
.fb-hero h1 em{font-style:normal;color:var(--o1)}
.fb-lead{color:rgba(247,248,244,.84);font-size:15.5px;max-width:520px}
.fb-hero__cta{display:flex;flex-wrap:wrap;gap:16px;margin-top:28px}
.fb-hero__media{overflow:hidden;border:1px solid var(--line-d)}
.fb-hero__media img{width:100%;height:360px;object-fit:cover;object-position:center 35%}
/* Ex 标志图解 */
.fb-ex{margin-top:34px;display:flex;flex-wrap:wrap;align-items:center;gap:22px;background:rgba(21,24,27,.45);border:1px solid var(--line-d);border-left:4px solid var(--o1);padding:20px 24px}
.fb-ex__mark{display:flex;align-items:stretch;gap:6px;font-family:var(--font-en);font-weight:900}
.fb-ex-word{font-size:30px;color:var(--o1);padding-right:14px;border-right:1px solid var(--line-d)}
.fb-ex-seg{display:inline-grid;place-items:center;font-size:20px;color:var(--white);background:var(--c2);border:1px solid var(--line-d);padding:0 14px}
.fb-ex-seg--d{background:var(--o1);border-color:var(--o1);color:#fff}
.fb-ex__legend{display:flex;flex-wrap:wrap;gap:8px 18px;margin:0;padding:0;list-style:none}
.fb-ex__legend li{font-size:12.5px;color:var(--g4)}
.fb-ex__legend b{font-family:var(--font-en);color:var(--o2);margin-right:5px}
/* 分区渐变带 */
.fb-zoneband{position:relative;z-index:2;display:grid;grid-template-columns:repeat(3,1fr);gap:0}
.fb-zoneband__strip{padding:18px 26px;color:#fff}
.fb-zoneband__strip b{font-family:var(--font-en);font-size:18px;margin-right:10px}
.fb-zoneband__strip span{font-size:12.5px;opacity:.92}
.fb-zoneband--z0{background:linear-gradient(135deg,#B23A1B,#D64511)}
.fb-zoneband--z1{background:linear-gradient(135deg,#C96A16,#E05B20)}
.fb-zoneband--z2{background:linear-gradient(135deg,#3E4A3C,#5A6158)}

/* ---------- 适用场景 ---------- */
.fb-use__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.fb-use__item{background:var(--c2);border:1px solid var(--line-d);padding:28px 24px;transition:transform .3s,border-color .3s}
.fb-use__item:hover{transform:translateY(-6px);border-color:rgba(224,91,32,.4)}
.fb-use__item svg{width:38px;height:38px;color:var(--o1);margin-bottom:16px}
.fb-use__item h3{font-size:17px;margin-bottom:10px}
.fb-use__item p{font-size:13.5px;color:var(--g4)}

/* ---------- 防爆等级知识卡（米白） ---------- */
.fb-grade{background:var(--paper);color:var(--c1)}
.fb-grade__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.fb-grade__card{background:#fff;border:1px solid var(--line-l);padding:30px 24px;position:relative;box-shadow:0 10px 30px rgba(20,24,27,.05)}
.fb-grade__card::before{content:"";position:absolute;top:0;left:0;width:100%;height:4px;background:var(--g2)}
.fb-grade__letter{display:inline-grid;place-items:center;width:54px;height:54px;font-family:var(--font-en);font-size:28px;font-weight:900;color:#fff;background:var(--o1);margin-bottom:18px;clip-path:polygon(0 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%)}
.fb-grade__card h3{font-size:17px;margin-bottom:10px;color:var(--c1)}
.fb-grade__card p{font-size:13.5px;color:#4C5449}
.fb-grade__note{margin-top:30px;text-align:center;color:#5A6158;font-size:14px}
.fb-grade__note a{color:var(--o1);font-weight:700;text-decoration:underline}
.fb-grade__depth{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:24px}
.fb-grade__depthitem{background:#fff;border:1px solid var(--line-l);padding:24px 26px}
.fb-grade__depthitem h4{font-size:16px;color:var(--c1);margin-bottom:8px}
.fb-grade__depthitem p{font-size:13.5px;color:#4C5449;line-height:1.7}

/* ---------- 危险区域划分 ---------- */
.fb-zone{background:var(--g1);position:relative;overflow:hidden}
.fb-zone::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:44px 44px}
.fb-zone__track{position:relative;display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1px solid var(--line-d)}
.fb-zone__col{padding:38px 32px;background:rgba(21,24,27,.4);border-right:1px dashed var(--line-d)}
.fb-zone__col:last-child{border-right:none}
.fb-zone__no{font-family:var(--font-en);font-size:13px;font-weight:900;letter-spacing:.16em;color:var(--o1)}
.fb-zone__col h3{font-size:26px;font-weight:900;margin:12px 0 10px}
.fb-zone__col p{font-size:14px;color:var(--g4)}
.fb-zone__col--z0 h3{color:#fff}

/* ---------- 报考条件 ---------- */
.fb-cond__grid{display:grid;grid-template-columns:1fr 1.1fr;gap:50px;align-items:center}
.fb-cond__media img{width:100%;height:420px;object-fit:cover}
.fb-cond__txt p{color:var(--g4);font-size:15px;max-width:480px}
.fb-cond__list{margin-top:22px;display:grid;gap:12px}
.fb-cond__list li{position:relative;padding-left:26px;font-size:14.5px;color:var(--white)}
.fb-cond__list li::before{content:"";position:absolute;left:0;top:8px;width:12px;height:12px;border:2px solid var(--o1);background:rgba(224,91,32,.15)}
.fb-sec-h2{font-size:clamp(24px,3vw,38px);font-weight:900;margin:14px 0 18px}
.fb-cond__btn{margin-top:24px}
.fb-cond__tag{display:inline-block;margin-left:8px;font-style:normal;font-size:11px;font-weight:700;letter-spacing:.05em;color:var(--o1);border:1px solid rgba(224,91,32,.5);padding:1px 8px;vertical-align:middle}

/* ---------- 为什么必须持证（军绿） ---------- */
.fb-why{background:var(--g1)}
.fb-why__grid{display:grid;grid-template-columns:1.1fr 1fr;gap:50px;align-items:center}
.fb-why__txt p{color:rgba(247,248,244,.84);font-size:15px;max-width:480px}
.fb-why__list{margin-top:22px;display:grid;gap:12px}
.fb-why__list li{position:relative;padding-left:28px;font-size:14.5px;color:var(--white)}
.fb-why__list li::before{content:"";position:absolute;left:0;top:5px;width:16px;height:16px;background:rgba(224,91,32,.18);border:1px solid var(--o1)}
.fb-why__list li::after{content:"";position:absolute;left:5px;top:9px;width:6px;height:3px;border-left:2px solid var(--o1);border-bottom:2px solid var(--o1);transform:rotate(-45deg)}
.fb-why__list li a{color:var(--o2);font-weight:700}
.fb-why__media img{width:100%;height:360px;object-fit:cover}

/* ---------- CTA ---------- */
.fb-cta{position:relative;overflow:hidden}
.fb-cta::before{content:"";position:absolute;left:0;top:0;right:0;height:6px;background:repeating-linear-gradient(90deg,var(--o1) 0 40px,var(--g1) 40px 80px)}
.fb-cta__inner{display:grid;grid-template-columns:1.2fr 1fr;gap:48px;align-items:center}
.fb-cta h2{font-size:clamp(24px,3.2vw,38px);font-weight:900;margin:16px 0 14px}
.fb-cta p{color:var(--g4);max-width:480px;margin-bottom:24px}
.fb-cta__tel{display:inline-flex;align-items:baseline;gap:14px;font-family:var(--font-en);font-size:34px;font-weight:900;color:var(--o1)}
.fb-cta__tel small{font-family:var(--font-cn);font-size:12px;color:var(--g4)}
.fb-cta__form{background:var(--c2);border:1px solid var(--line-d);padding:32px;clip-path:polygon(24px 0,100% 0,100% calc(100% - 24px),calc(100% - 24px) 100%,0 100%,0 24px)}
.fb-cta__form h3{font-size:19px;margin-bottom:4px}
.fb-cta__form>p{font-size:13px;margin-bottom:18px}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .fb-hero__grid{grid-template-columns:1fr;gap:34px;padding-bottom:34px}
  .fb-hero__media{order:-1}
  .fb-hero__media img{height:280px}
  .fb-use__grid{grid-template-columns:1fr 1fr}
  .fb-grade__grid{grid-template-columns:1fr 1fr}
  .fb-zone__track{grid-template-columns:1fr}
  .fb-zone__col{border-right:none;border-bottom:1px dashed var(--line-d)}
  .fb-cond__grid{grid-template-columns:1fr;gap:30px}
  .fb-cta__inner{grid-template-columns:1fr}
  .fb-why__grid{grid-template-columns:1fr;gap:30px}
}
@media (max-width:640px){
  .fb-use__grid{grid-template-columns:1fr}
  .fb-grade__grid{grid-template-columns:1fr}
  .fb-grade__depth{grid-template-columns:1fr}
  .fb-cta__tel{font-size:26px}
  .fb-zoneband{grid-template-columns:1fr}
  .fb-ex{gap:14px}
}