/* ================= 预约演示弹窗 ================= */
.bk-overlay{
  position:fixed;inset:0;z-index:10000;
  display:flex;align-items:center;justify-content:center;padding:24px;
  background:rgba(15,12,40,.55);backdrop-filter:blur(6px);
  opacity:0;visibility:hidden;
  transition:opacity .25s,visibility .25s;
}
/* 关键修复：作者样式的 display:flex 会覆盖浏览器默认的 [hidden]{display:none}，
   关闭时必须显式隐藏，否则透明遮罩会铺满全屏、拦截页面上所有鼠标点击 */
.bk-overlay[hidden]{display:none}
.bk-overlay.open{opacity:1;visibility:visible}
.bk-modal{
  position:relative;display:grid;grid-template-columns:330px 1fr;
  width:min(900px,100%);max-height:min(92vh,780px);
  background:#fff;border-radius:20px;overflow:hidden;
  box-shadow:0 30px 80px rgba(17,24,39,.35);
  transform:translateY(18px) scale(.97);transition:transform .25s;
}
.bk-overlay.open .bk-modal{transform:none}
.bk-close{
  position:absolute;top:14px;right:14px;z-index:3;
  width:36px;height:36px;border:none;border-radius:50%;cursor:pointer;
  background:rgba(17,24,39,.06);color:#4b5563;font-size:15px;line-height:1;
  display:flex;align-items:center;justify-content:center;transition:background .2s;
}
.bk-close:hover{background:rgba(17,24,39,.12)}

/* 左侧：联系方式（深色面板） */
.bk-info{
  background:linear-gradient(160deg,#191624 0%,#241d3d 70%,#2e2452 100%);
  color:#fff;padding:40px 32px 30px;display:flex;flex-direction:column;
}
.bk-info h3{font-size:24px;font-weight:700;margin-bottom:4px}
.bk-info .bk-en{
  font-size:12px;letter-spacing:.12em;color:rgba(255,255,255,.5);
  text-transform:uppercase;margin-bottom:36px;
}
.bk-info-list{list-style:none;display:flex;flex-direction:column;gap:26px}
.bk-info-list li{display:flex;gap:14px;align-items:flex-start}
.bk-ic{
  flex:none;width:38px;height:38px;border-radius:11px;
  background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.14);
  display:flex;align-items:center;justify-content:center;
}
.bk-ic svg{width:18px;height:18px}
.bk-info-list strong{display:block;font-size:14px;margin-bottom:4px;color:rgba(255,255,255,.92)}
.bk-info-list span{font-size:13px;line-height:1.6;color:rgba(255,255,255,.66)}
.bk-info-list a{color:rgba(255,255,255,.66);text-decoration:none}
.bk-info-list a:hover{color:#fff}
.bk-dots{margin-top:auto;display:flex;gap:8px;padding-top:36px}
.bk-dots i{width:9px;height:9px;border-radius:50%;background:rgba(255,255,255,.22)}
.bk-dots i:first-child{background:rgba(255,255,255,.5)}

/* 右侧：表单 */
.bk-form-wrap{padding:40px 42px;overflow-y:auto}
.bk-h2{font-size:26px;font-weight:700;margin-bottom:8px}
.bk-sub{font-size:14px;color:var(--ink-soft);margin-bottom:30px}
.bk-form-title{font-size:17px;font-weight:700;margin-bottom:18px}
.bk-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.bk-field{margin-bottom:16px}
.bk-field label{display:block;font-size:13px;font-weight:600;color:#374151;margin-bottom:7px}
.bk-field label em{font-style:normal;color:#ef4444;margin-left:2px}
.bk-field input,.bk-field textarea{
  width:100%;border:1px solid var(--line);border-radius:10px;
  padding:11px 14px;font-size:14px;font-family:inherit;color:var(--ink);
  background:#fff;transition:border-color .2s,box-shadow .2s;resize:vertical;
}
.bk-field input:focus,.bk-field textarea:focus{
  outline:none;border-color:var(--brand);
  box-shadow:0 0 0 3px rgba(79,70,229,.12);
}
.bk-err{
  font-size:13px;color:#dc2626;background:#fef2f2;
  border:1px solid #fecaca;border-radius:10px;padding:10px 14px;margin-bottom:14px;
}
.bk-submit{
  width:100%;display:flex;align-items:center;justify-content:center;gap:9px;
  border:none;border-radius:10px;cursor:pointer;
  padding:13px 24px;font-size:15px;font-weight:600;color:#fff;font-family:inherit;
  background:linear-gradient(120deg,var(--grad-start),var(--grad-end));
  box-shadow:0 10px 24px rgba(79,70,229,.3);
  transition:transform .2s,box-shadow .2s,opacity .2s;
}
.bk-submit:hover{transform:translateY(-1px);box-shadow:0 14px 30px rgba(79,70,229,.38)}
.bk-submit:disabled{opacity:.7;cursor:not-allowed;transform:none}
.bk-submit svg{width:17px;height:17px}

/* 发送结果 */
.bk-success{text-align:center;padding:40px 10px}
.bk-check{
  width:64px;height:64px;margin:0 auto 20px;border-radius:50%;
  background:linear-gradient(120deg,var(--grad-start),var(--grad-end));
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 12px 30px rgba(79,70,229,.35);
}
.bk-check.fail{background:linear-gradient(120deg,#f59e0b,#ef4444);box-shadow:0 12px 30px rgba(239,68,68,.32)}
.bk-check svg{width:30px;height:30px}
.bk-success p{font-size:16px;font-weight:600;color:var(--ink);line-height:1.7;margin-bottom:24px}
.bk-fail-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:22px}
.bk-ok-btn{
  border:1px solid var(--line);background:#fff;border-radius:10px;
  padding:11px 42px;font-size:14px;font-weight:600;color:var(--brand);cursor:pointer;font-family:inherit;
  transition:background .2s,border-color .2s;
}
.bk-ok-btn:hover{background:#eef2ff;border-color:#c7d2fe}
.bk-mail-btn{
  display:inline-flex;align-items:center;justify-content:center;
  border:1px solid var(--line);background:#fff;border-radius:10px;
  padding:11px 28px;font-size:14px;font-weight:600;color:var(--brand);text-decoration:none;font-family:inherit;
  transition:background .2s,border-color .2s;
}
.bk-mail-btn:hover{background:#eef2ff;border-color:#c7d2fe}
/* 反垃圾蜜罐字段（对用户不可见） */
.bk-honey{position:absolute;left:-9999px;width:1px;height:1px;opacity:0;pointer-events:none}

@media (max-width:720px){
  .bk-modal{grid-template-columns:1fr;max-height:92vh;overflow-y:auto}
  .bk-info{padding:30px 26px 24px}
  .bk-dots{display:none}
  .bk-form-wrap{padding:30px 26px 34px}
  .bk-row{grid-template-columns:1fr}
}