/* ============================================================
 * 样式 —— 沿用原资料的配色语言,升级为站点级设计
 * ============================================================ */
* { box-sizing: border-box; margin: 0; padding: 0; }
:root{
  --bg:#f6f7f9; --panel:#fff; --ink:#16181d; --muted:#6b7280;
  --line:#e5e7eb; --brand:#1e40af; --brand2:#2563eb; --brand-soft:#eff4ff;
  --hot:#dc2626; --hot-soft:#fef2f2; --mid:#d97706; --mid-soft:#fffbeb;
  --low:#059669; --low-soft:#ecfdf5; --ok:#059669;
  --r:12px; --shadow:0 1px 3px rgba(16,24,40,.06),0 1px 2px rgba(16,24,40,.04);
}
html,body{height:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang TC","Microsoft JhengHei","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--ink); line-height:1.7; font-size:15px;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
button{font-family:inherit}

/* ---------- 布局 ---------- */
.layout{display:flex;min-height:100vh}
.side{
  width:320px;flex:0 0 320px;background:var(--panel);border-right:1px solid var(--line);
  position:sticky;top:0;height:100vh;overflow-y:auto;
}
.side-hd{padding:18px 18px 14px;border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:9px}
.brand-logo{
  width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--brand2));
  color:#fff;display:grid;place-items:center;font-weight:800;font-size:13px;flex:0 0 auto;
}
.brand-txt b{display:block;font-size:14px;color:var(--brand);line-height:1.3}
.brand-txt span{font-size:11px;color:var(--muted)}
.nav{padding:10px 10px 40px}
.nav-title{font-size:11px;color:var(--muted);padding:10px 8px 6px;letter-spacing:.5px;font-weight:600}
.nav-item{
  display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:8px;
  font-size:12.5px;margin-bottom:2px;color:var(--ink);transition:background .12s;
}
.nav-item:hover{background:var(--brand-soft)}
.nav-item.is-active{background:var(--brand-soft);font-weight:600}
.nav-code{font-weight:700;font-size:11px;color:#fff;background:var(--muted);border-radius:5px;padding:1px 6px;flex:0 0 auto}
.tier-hot .nav-code{background:var(--hot)} .tier-mid .nav-code{background:var(--mid)} .tier-low .nav-code{background:var(--low)}
.nav-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.nav-freq{font-size:11px;color:var(--muted);font-weight:600}
.nav-lock{font-size:11px;opacity:.55}

.main-wrap{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{
  position:sticky;top:0;z-index:40;background:rgba(255,255,255,.9);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);padding:10px 28px;display:flex;align-items:center;justify-content:space-between;gap:14px;
}
.topbar .mobile-brand{display:none;font-weight:700;color:var(--brand);font-size:14px}
.topbar-actions{display:flex;align-items:center;gap:10px;margin-left:auto}
.who{font-size:12.5px;color:var(--muted)}
.pill{font-size:12px;padding:2px 10px;border-radius:20px;background:#f3f4f6;color:var(--muted);font-weight:600}
.pill.ok{background:var(--low-soft);color:var(--low)}
.main{flex:1;min-width:0;padding-bottom:70px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:9px 18px;border-radius:9px;font-size:13.5px;font-weight:600;cursor:pointer;
  border:1px solid transparent;transition:all .15s;white-space:nowrap;
}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:#1a3796}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:#cbd5e1;background:#fafafa}
.btn-light{background:#fff;color:var(--brand)}
.btn-light:hover{background:#f0f4ff}
.btn-outline-light{background:transparent;border-color:rgba(255,255,255,.55);color:#fff}
.btn-outline-light:hover{background:rgba(255,255,255,.12)}
.btn-lg{padding:12px 26px;font-size:15px}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* ---------- Hero ---------- */
.hero{background:linear-gradient(135deg,#1e3a8a,#2563eb 60%,#3b82f6);color:#fff;padding:44px 40px 38px}
.hero h1{font-size:27px;line-height:1.35;margin-bottom:12px;letter-spacing:-.3px}
.hero p{font-size:14px;opacity:.93;max-width:760px}
.hero p b{color:#fde68a}
.hero-cta{display:flex;gap:12px;margin-top:22px;flex-wrap:wrap}
.hero-stats{display:flex;gap:26px;margin-top:28px;flex-wrap:wrap}
.hero-stats div{display:flex;flex-direction:column}
.hero-stats b{font-size:24px;line-height:1}
.hero-stats span{font-size:11.5px;opacity:.8;margin-top:2px}

/* ---------- 区块 ---------- */
.sec{padding:32px 40px}
.sec h2{font-size:19px;margin-bottom:6px}
.sec-sub{color:var(--muted);font-size:13.5px;margin-bottom:20px}
.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px;margin-top:16px}
.tcard{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:16px;
  transition:all .15s;display:flex;flex-direction:column;gap:7px;
}
.tcard:hover{box-shadow:0 6px 18px rgba(30,64,175,.1);transform:translateY(-2px);border-color:#c7d6f5}
.tcard.tier-hot{border-left:4px solid var(--hot)}
.tcard.tier-mid{border-left:4px solid var(--mid)}
.tcard.tier-low{border-left:4px solid var(--low)}
.tcode{align-self:flex-start;font-size:12px;font-weight:800;color:#fff;border-radius:6px;padding:2px 9px}
.tcode.tier-hot{background:var(--hot)} .tcode.tier-mid{background:var(--mid)} .tcode.tier-low{background:var(--low)}
.tname{font-size:13.5px;font-weight:600;line-height:1.55}
.tfreq{font-size:12px;color:var(--muted)}
.tfreq b{color:var(--ink)}
.why-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin-top:16px}
.wcard{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:20px}
.wi{font-size:22px;margin-bottom:8px}
.wcard h3{font-size:14.5px;margin-bottom:6px}
.wcard p{font-size:13px;color:var(--muted)}
.cta-band{background:linear-gradient(135deg,#eff4ff,#e0eaff);border:1px solid #c7d6f5;border-radius:16px;margin:10px 40px 40px;text-align:center;padding:38px 28px}
.cta-band h2{font-size:20px;margin-bottom:8px}
.cta-band p{color:#374151;margin-bottom:18px;font-size:14px}

/* ---------- 考点页 ---------- */
.breadcrumb{padding:16px 40px 0;font-size:12.5px;color:var(--muted);display:flex;align-items:center;gap:6px}
.breadcrumb a:hover{color:var(--brand)}
.crumb-free{background:var(--low-soft);color:var(--low);font-weight:700;font-size:11px;padding:1px 8px;border-radius:10px;margin-left:4px}
.topic-hero{padding:22px 40px 18px}
.th-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.th-code{font-size:14px;font-weight:800;color:#fff;border-radius:7px;padding:2px 10px}
.th-code.tier-hot{background:var(--hot)} .th-code.tier-mid{background:var(--mid)} .th-code.tier-low{background:var(--low)}
.th-tier{font-size:12px;font-weight:700;padding:2px 9px;border-radius:20px;background:#f3f4f6;color:var(--muted)}
.th-freq{font-size:12.5px;color:var(--muted)} .th-freq b{color:var(--ink);font-size:15px}
.th-free{font-size:11.5px;font-weight:700;color:var(--low);background:var(--low-soft);padding:2px 9px;border-radius:20px}
.topic-hero h2{font-size:21px;line-height:1.45;letter-spacing:-.2px}
.topic-content{padding:8px 40px 30px}
.topic-content.is-blurred{position:relative;max-height:520px;overflow:hidden;filter:blur(1.4px) saturate(.9);opacity:.85;user-select:none;pointer-events:none}
.lock-fade{position:absolute;inset:auto 0 0 0;height:220px;background:linear-gradient(transparent,#f6f7f9 88%)}

/* 原内容块样式(考点正文内部) */
.topic-content .fw-block{background:var(--brand-soft);border-radius:10px;padding:14px 16px;margin-bottom:12px}
.topic-content .fw-block h4{font-size:13px;color:var(--brand);margin-bottom:8px}
.topic-content .fw-block.tips{background:#fffbeb}
.topic-content .fw-block.tips h4{color:var(--mid)}
.topic-content .fw-block.tips p{font-size:12.5px;color:#78350f}
.topic-content .fw-block ul.cb{padding-left:20px;font-size:12.5px}
.topic-content .fw-block ul.cb li{margin-bottom:5px}
.topic-content .fw-sub{margin-bottom:10px}
.topic-content .fw-sub strong{display:block;font-size:12.5px;color:#1e3a8a;margin-bottom:4px}
.topic-content .fw-sub ol,.topic-content .fw-sub ul{padding-left:20px;font-size:12.5px;color:#374151}
.topic-content .fw-sub ol li,.topic-content .fw-sub ul li{margin-bottom:4px}
.topic-content h3.tier-head{font-size:16px;margin:18px 0 10px;color:var(--brand)}
.topic-content .q-list h4{font-size:13px;color:var(--muted);margin:16px 0 10px}
.topic-content .qcard{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin-bottom:12px}
.topic-content .qhead{display:flex;align-items:center;gap:8px;margin-bottom:8px;flex-wrap:wrap}
.topic-content .q-exam{font-weight:700;font-size:12px;color:var(--brand);background:var(--brand-soft);padding:2px 8px;border-radius:6px}
.topic-content .q-no{font-weight:700;font-size:13px}
.topic-content .badge{font-size:10px;padding:2px 7px;border-radius:10px;color:#fff}
.topic-content .badge-a{background:#6366f1} .topic-content .badge-b{background:#0891b2}
.topic-content .q-marks{font-size:11px;color:var(--muted)}
.topic-content .q-company{font-size:12px;color:var(--muted);margin-bottom:6px;font-style:italic}
.topic-content .q-text{font-size:13.5px;color:#111827}
.topic-content details.ans{margin-top:10px}
.topic-content details.ans summary{cursor:pointer;font-size:12.5px;color:var(--brand);font-weight:600}
.topic-content .ans-body{margin-top:10px;padding:14px 16px;background:#f9fafb;border-radius:8px;font-size:13px;line-height:1.72;color:#374151;border-left:3px solid #93c5fd}
.topic-content .ans-body p{margin:0 0 9px;text-align:justify}
.topic-content .ans-body p.ans-h{font-size:12.5px;font-weight:700;color:#1e3a8a;margin:14px 0 7px;padding-left:9px;border-left:3px solid #93c5fd}
.topic-content .ans-body ul{padding-left:22px;margin:0 0 10px}
.topic-content .ans-body li{margin-bottom:5px;text-align:justify}
.topic-content details.rubric{margin-top:12px;border-top:1px dashed #cbd5e1;padding-top:8px}
.topic-content details.rubric summary{cursor:pointer;font-size:12px;color:#64748b;font-weight:600}

/* ---------- 付费墙 ---------- */
.paywall{
  margin:0 40px 40px;background:var(--panel);border:1px solid #c7d6f5;border-radius:16px;
  padding:32px 28px;text-align:center;box-shadow:0 8px 30px rgba(30,64,175,.08);
}
.pw-icon{font-size:30px;margin-bottom:8px}
.paywall h3{font-size:18px;margin-bottom:8px}
.paywall p{font-size:13.5px;color:var(--muted);margin-bottom:14px}
.pw-price{display:flex;align-items:baseline;justify-content:center;gap:8px;margin:16px 0 20px}
.pw-price b{font-size:30px;color:var(--brand)}
.pw-price span{font-size:13px;color:var(--muted)}
.pw-note{font-size:12.5px;margin-top:14px}
.pw-note a{color:var(--brand);font-weight:600}

.pager{display:flex;justify-content:space-between;padding:20px 40px 50px;gap:12px}
.pager a{font-size:13px;color:var(--brand);font-weight:600}
.pager a.off{opacity:.35;pointer-events:none}

/* ---------- 定价 ---------- */
.price-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;margin-top:8px;max-width:760px}
.pcard{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:26px 24px;display:flex;flex-direction:column}
.pcard.muted{background:#fbfbfc}
.pc-name{font-size:14px;font-weight:700;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.soon{font-size:10.5px;background:#fef2f2;color:var(--hot);padding:1px 7px;border-radius:10px;font-weight:700}
.pc-price{display:flex;align-items:baseline;gap:4px;margin-bottom:4px}
.pc-price span{font-size:16px;color:var(--muted);font-weight:600}
.pc-price b{font-size:38px;color:var(--brand);line-height:1}
.pc-term{font-size:12.5px;color:var(--muted);margin-bottom:18px}
.pc-list{list-style:none;font-size:13.5px;color:#374151;margin-bottom:22px;flex:1}
.pc-list li{margin-bottom:9px}
.pc-note{font-size:12px;color:var(--muted);text-align:center;margin-top:10px}

/* ---------- 认证 ---------- */
.auth-wrap{display:grid;place-items:center;padding:60px 20px}
.auth-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:32px 30px;width:100%;max-width:400px;box-shadow:var(--shadow)}
.auth-card h2{font-size:20px;margin-bottom:18px}
.auth-tip{font-size:13px;color:var(--muted);margin-bottom:14px}
.auth-card label{display:block;font-size:13px;font-weight:600;margin-bottom:14px;color:#374151}
.auth-card input{width:100%;margin-top:6px;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font-size:14px;font-family:inherit}
.auth-card input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
.auth-card button{width:100%;margin-top:4px}
.auth-links{font-size:13px;color:var(--muted);text-align:center;margin-top:16px}
.auth-links a{color:var(--brand);font-weight:600}
.auth-msg{font-size:13px;text-align:center;margin-top:12px;min-height:18px}
.auth-msg.err{color:var(--hot)} .auth-msg.ok{color:var(--ok)}

/* ---------- 账户 ---------- */
.acct-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:8px 22px;max-width:520px;margin-top:8px}
.acct-row{display:flex;justify-content:space-between;padding:14px 0;border-bottom:1px solid var(--line);font-size:14px}
.acct-row:last-child{border-bottom:none}
.acct-row span{color:var(--muted)}
.acct-row b.ok{color:var(--ok)} .acct-row b.off{color:var(--hot)}
.acct-cta{padding:16px 0}
.disclaimer{font-size:12px;color:var(--muted);margin-top:20px;max-width:620px;line-height:1.7}

/* ---------- 弹窗 ---------- */
.modal-mask{position:fixed;inset:0;background:rgba(16,24,40,.5);display:grid;place-items:center;z-index:100;padding:20px}
.modal{background:#fff;border-radius:16px;padding:28px 26px;max-width:440px;width:100%;box-shadow:0 20px 50px rgba(0,0,0,.25)}
.modal h3{font-size:18px;margin-bottom:10px}
.modal>p{font-size:13.5px;color:#374151;margin-bottom:6px}
.pay-box{background:var(--brand-soft);border-radius:10px;padding:14px 16px;margin:14px 0}
.pay-tip{font-size:12.5px;color:#374151;margin-bottom:8px}
.pay-box ul{list-style:none;font-size:13px;color:#374151}
.pay-box ul li{margin-bottom:6px}
.demo-grant{background:#fffbeb;border:1px solid #f0d99a;border-radius:10px;padding:12px 14px;margin-bottom:14px;font-size:12.5px;color:#78350f}
.demo-grant button{margin-top:10px}
.modal .btn-ghost{width:100%}

/* ---------- Toast ---------- */
.toast{
  position:fixed;bottom:26px;left:50%;transform:translateX(-50%) translateY(20px);
  background:#16181d;color:#fff;font-size:13px;padding:11px 20px;border-radius:10px;
  opacity:0;pointer-events:none;transition:all .25s;z-index:200;max-width:90vw;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.empty{padding:60px 40px;color:var(--muted);text-align:center}

/* ---------- 移动端 ---------- */
.mobile-toggle{display:none;background:none;border:none;font-size:20px;cursor:pointer;color:var(--ink)}
@media(max-width:920px){
  .side{position:fixed;left:0;top:0;z-index:60;transform:translateX(-100%);transition:transform .25s;box-shadow:0 0 40px rgba(0,0,0,.2)}
  .side.open{transform:translateX(0)}
  .mobile-toggle{display:block}
  .topbar .mobile-brand{display:block}
  .hero{padding:32px 22px}
  .hero h1{font-size:22px}
  .sec{padding:26px 22px}
  .cta-band{margin:10px 22px 30px;padding:28px 20px}
  .breadcrumb{padding:14px 22px 0}
  .topic-hero{padding:18px 22px 14px}
  .topic-content{padding:8px 22px 24px}
  .paywall{margin:0 22px 30px;padding:26px 20px}
  .pager{padding:20px 22px 40px}
  .who{display:none}
}