/* ============================================================
   beikao.css —— E8 备考指南页
   Hero 裁切：层叠波纹下缘
   核心技法：四周计划周卡 + 资料选择 + 在职备考墨黑建议
   ============================================================ */

/* ---------- Hero ---------- */
.bk-hero{
  position:relative; margin-top:var(--nav-h);
  padding:72px 0 112px; color:var(--cream); background:var(--ink);
  clip-path:polygon(0 0,100% 0,100% 85%,75% 95%,50% 88%,25% 98%,0 90%);
}
.bk-hero-img{ position:absolute; inset:0; overflow:hidden; }
.bk-hero-img img{ width:100%; height:100%; object-fit:cover; opacity:.4; }
.bk-hero::after{
  content:""; position:absolute; inset:0;
  background:linear-gradient(90deg,rgba(28,26,23,.75),rgba(28,26,23,.5));
}
.bk-hero-inner{ position:relative; z-index:2; }
.bk-hero .crumb{ color:rgba(242,232,213,.7); margin-bottom:20px; }
.bk-hero .crumb a{ color:rgba(242,232,213,.8); }
.bk-hero .keycap{ margin-bottom:16px; }
.bk-hero h1{ font-size:clamp(30px,4.6vw,50px); color:var(--cream); margin-bottom:16px; letter-spacing:2px; }
.bk-hero-sub{ max-width:640px; font-size:15.5px; line-height:1.9; color:rgba(242,232,213,.86); margin-bottom:28px; }
.bk-hero-cta{ display:flex; flex-wrap:wrap; gap:14px; }

/* ---------- section ---------- */
.bk-sec{ padding:78px 0; }
.bk-tint{ background:var(--paper-2); }
.bk-dark{ background:var(--ink); color:rgba(242,232,213,.88); padding-top:92px; }
.bk-dark h2{ color:var(--cream); }
.bk-head{ margin-bottom:34px; }
.bk-no{ display:block; font-family:var(--font-mono); font-size:12.5px; letter-spacing:3px; color:var(--brown-3); margin-bottom:10px; }
.bk-dark .bk-no{ color:var(--tan); }
.bk-head h2{ font-size:clamp(24px,3vw,34px); margin-bottom:10px; }
.bk-desc{ color:var(--brown-2); font-size:15px; max-width:640px; }

/* ---------- 周卡 ---------- */
.bk-weeks{ display:grid; grid-template-columns:repeat(4,1fr); gap:18px; }
.bk-week{
  background:var(--paper); border:1px solid var(--line); border-radius:12px; padding:22px 20px;
  box-shadow:var(--shadow-sm); position:relative; overflow:hidden;
}
.bk-week::before{
  content:""; position:absolute; top:0; left:0; right:0; height:5px; background:var(--brown-3);
}
.bk-week b{ display:block; font-family:var(--font-mono); font-size:13px; color:var(--tan); margin-bottom:8px; }
.bk-week h3{ font-size:18px; color:var(--ink); margin-bottom:8px; }
.bk-week p{ font-size:13.5px; color:var(--ink-2); line-height:1.8; }
.bk-week a{ color:var(--brown-3); text-decoration:underline; text-underline-offset:3px; }

/* ---------- 资料 ---------- */
.bk-mat ul{ display:grid; grid-template-columns:repeat(2,1fr); gap:12px 30px; margin-bottom:18px; }
.bk-mat li{ padding:10px 0; border-bottom:1px dotted var(--line-2); }
.bk-mat b{ display:block; font-family:var(--font-head); color:var(--brown-2); margin-bottom:4px; }
.bk-mat span{ font-size:14px; color:var(--ink-2); }
.bk-matnote{ font-size:13.5px; color:var(--brown-2); background:var(--paper); border-left:4px solid var(--brown-3); padding:12px 16px; border-radius:0 8px 8px 0; }

/* ---------- 两科图文 ---------- */
.bk-two{ display:grid; grid-template-columns:1fr 1.15fr; gap:44px; align-items:center; }
.bk-two-img img{ border-radius:16px; box-shadow:var(--shadow); clip-path:polygon(0 0,100% 4%,100% 96%,0 100%); }
.bk-two-t h2{ font-size:clamp(22px,2.6vw,30px); margin:10px 0 14px; }
.bk-two-t p{ font-size:15px; color:var(--ink-2); margin-bottom:12px; }
.bk-two-t strong{ color:var(--brown-2); }
.bk-two-t a{ color:var(--brown-3); text-decoration:underline; text-underline-offset:3px; }

/* ---------- 墨黑建议 ---------- */
.bk-adv{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.bk-ad{
  background:var(--ink-2); border:1px solid rgba(242,232,213,.14); border-radius:12px; padding:24px 22px;
}
.bk-ad b{ display:block; color:var(--tan); font-family:var(--font-head); font-size:19px; margin-bottom:10px; }
.bk-ad p{ font-size:14px; color:rgba(242,232,213,.8); line-height:1.85; }

/* ---------- FAQ ---------- */
.bk-faqw{ max-width:820px; }
.bk-faq{ background:var(--paper); border:1px solid var(--line); border-radius:10px; margin-bottom:12px; overflow:hidden; }
.bk-faq summary{ cursor:pointer; padding:15px 20px; font-weight:700; color:var(--ink); list-style:none; font-size:15px; position:relative; padding-right:36px; }
.bk-faq summary::-webkit-details-marker{ display:none; }
.bk-faq summary::after{ content:"＋"; position:absolute; right:16px; top:50%; transform:translateY(-50%); color:var(--brown-3); font-family:var(--font-mono); }
.bk-faq[open] summary::after{ content:"－"; }
.bk-faq p{ padding:0 20px 16px; font-size:14.5px; color:var(--ink-2); }
.bk-faq a{ color:var(--brown-3); text-decoration:underline; text-underline-offset:3px; }

/* ---------- 免责 + CTA ---------- */
.bk-disc{ background:var(--paper-3); border-top:1px dashed var(--line-2); padding:28px 0; }
.bk-disc p{ font-size:13.5px; color:var(--brown-2); line-height:1.9; max-width:960px; }
.bk-disc strong{ color:var(--ink); }
.bk-cta{ background:var(--brown); color:var(--cream); padding:70px 0; }
.bk-cta-in{ text-align:center; max-width:660px; margin:0 auto; }
.bk-cta-in h2{ color:var(--cream); font-size:clamp(24px,3vw,32px); margin-bottom:12px; }
.bk-cta-in p{ color:rgba(242,232,213,.85); margin-bottom:24px; }
.bk-cta-row{ display:flex; justify-content:center; flex-wrap:wrap; gap:14px; }
.bk-cta .btn-ghost{ color:var(--cream); border-color:rgba(242,232,213,.5); }

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .bk-weeks{ grid-template-columns:repeat(2,1fr); }
  .bk-mat ul{ grid-template-columns:1fr; }
  .bk-two,.bk-adv{ grid-template-columns:1fr; gap:24px; }
}
@media (max-width:640px){
  .bk-sec{ padding:54px 0; }
  .bk-weeks{ grid-template-columns:1fr; }
  .bk-hero-cta .btn{ width:100%; }
}

/* 增补板块段落排版 */
.more-p p{font-size:15px;line-height:1.95;color:var(--ink-2);margin-bottom:14px;max-width:880px;}
.more-p strong{color:var(--brown-2);}
.more-p a{color:var(--brown-3);text-decoration:underline;text-underline-offset:3px;}

/* ===== 第二轮迭代：编号条目卡片板块 ===== */
.e2-sec{padding:72px 0;background:var(--paper-2);}
.e2-head{margin-bottom:10px;}
.e2-no{display:block;font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--tan);margin-bottom:10px;}
.e2-head h2{font-family:var(--font-head);font-size:clamp(24px,3vw,34px);color:var(--ink);}
.e2-list{display:grid;gap:14px;margin-top:30px;}
.e2-item{display:grid;grid-template-columns:56px 1fr;gap:18px;background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:22px 24px;clip-path:polygon(0 0,100% 0,100% calc(100% - 16px),calc(100% - 16px) 100%,0 100%);}
.e2-num{font-family:var(--font-mono);font-size:20px;color:var(--tan);line-height:1.2;}
.e2-item h3{font-size:17px;color:var(--ink);margin-bottom:6px;font-family:var(--font-head);}
.e2-item p{font-size:14px;color:var(--ink-2);line-height:1.9;}
.e2-item p strong{color:var(--brown-2);}
.e2-item p a{color:var(--brown-3);text-decoration:underline;text-underline-offset:3px;}
@media(max-width:1080px){.e2-item{grid-template-columns:1fr;gap:6px;}}