/* Zalo Bot Form – không phụ thuộc thư viện ngoài. Màu chính đổi qua --zbf-primary. */
.zbf{
  --zbf-primary:#184a7e;
  --zbf-text:#1f2937;
  --zbf-muted:#6b7280;
  --zbf-border:#d8dee8;
  --zbf-error:#d93636;
  --zbf-frame:#eef3f9;
  container-type:inline-size;
  box-sizing:border-box;
  max-width:100%;
  margin:0 0 24px;
  padding:12px;
  background:var(--zbf-frame);
  border-radius:16px;
  color:var(--zbf-text);
  font-family:inherit;
  line-height:1.5;
}
.zbf *,.zbf *::before,.zbf *::after{box-sizing:border-box}

.zbf .zbf-card{
  margin:0;
  padding:24px 16px 18px;
  background:#fff;
  border-radius:10px;
  box-shadow:0 1px 2px rgba(16,42,77,.06);
}

/* Đầu form */
.zbf .zbf-head{margin:0 0 20px;padding:0 0 16px;border-bottom:1px solid #e6eaf0}
.zbf .zbf-title{margin:0 0 6px;font-size:19px;font-weight:600;line-height:1.3;color:var(--zbf-primary)}
.zbf .zbf-sub{margin:0;font-size:13.5px;color:var(--zbf-muted)}

/* Lưới: 1 cột mặc định, 2 cột khi khung form đủ rộng */
.zbf .zbf-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:14px 12px}
.zbf .zbf-full{grid-column:1/-1}

.zbf .zbf-field{margin:0;min-width:0}
.zbf .zbf-label{display:block;margin:0 0 7px;font-size:14px;font-weight:600;line-height:1.35;color:var(--zbf-text);text-transform:none;letter-spacing:0}
.zbf .zbf-req{color:var(--zbf-error);font-weight:600}

/* Ô nhập: ghi đè style mặc định của theme */
.zbf .zbf-input{
  display:block;
  width:100%;
  max-width:none;
  height:46px;
  margin:0;
  padding:0 13px;
  font:inherit;
  font-size:16px; /* 16px để iPhone không tự phóng to khi chạm */
  line-height:1.4;
  color:var(--zbf-text);
  background:#fff;
  border:1px solid var(--zbf-border);
  border-radius:7px;
  box-shadow:none;
  outline:0;
  transition:border-color .15s,box-shadow .15s;
  -webkit-appearance:none;
  appearance:none;
}
.zbf .zbf-input::placeholder{color:#9aa3af;opacity:1}
.zbf .zbf-input:hover{border-color:#bfc8d6}
.zbf .zbf-input:focus{
  border-color:var(--zbf-primary);
  box-shadow:0 0 0 3px color-mix(in srgb,var(--zbf-primary) 16%,transparent);
}
.zbf .zbf-textarea{height:auto;min-height:76px;padding:11px 13px;resize:vertical}
.zbf .zbf-select{
  padding-right:38px;
  cursor:pointer;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5l5 5 5-5' fill='none' stroke='%236b7280' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;
  background-position:right 14px center;
  background-size:12px 8px;
}
.zbf .zbf-select:invalid,.zbf .zbf-select.is-empty{color:#9aa3af}
.zbf .zbf-select option{color:var(--zbf-text)}

/* Lỗi */
.zbf .zbf-err{margin:5px 0 0;font-size:13px;line-height:1.35;color:var(--zbf-error)}
.zbf .zbf-err:empty{display:none}
.zbf .is-invalid .zbf-input{border-color:var(--zbf-error)}
.zbf .is-invalid .zbf-input:focus{box-shadow:0 0 0 3px rgba(217,54,54,.14)}

/* Nút gửi */
.zbf .zbf-btn{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  width:100%;
  min-height:50px;
  margin:16px 0 0;
  padding:12px 20px;
  font:inherit;
  font-size:16px;
  font-weight:700;
  line-height:1.2;
  letter-spacing:.02em;
  text-transform:uppercase;
  color:#fff;
  background:var(--zbf-primary);
  border:0;
  border-radius:7px;
  box-shadow:0 4px 12px color-mix(in srgb,var(--zbf-primary) 28%,transparent);
  cursor:pointer;
  transition:filter .15s,transform .1s,box-shadow .15s;
}
.zbf .zbf-btn:hover{filter:brightness(1.12);color:#fff;background:var(--zbf-primary)}
.zbf .zbf-btn:active{transform:translateY(1px)}
.zbf .zbf-btn:focus-visible{outline:3px solid color-mix(in srgb,var(--zbf-primary) 40%,transparent);outline-offset:2px}
.zbf .zbf-btn[disabled]{cursor:wait;filter:saturate(.6) brightness(1.15)}
.zbf .zbf-btn.is-loading::before{
  content:"";
  width:16px;height:16px;
  border:2px solid rgba(255,255,255,.4);
  border-top-color:#fff;
  border-radius:50%;
  animation:zbf-spin .7s linear infinite;
}
@keyframes zbf-spin{to{transform:rotate(360deg)}}

.zbf .zbf-note{margin:10px 0 0;font-size:12.5px;text-align:center;color:var(--zbf-muted)}

/* Thông báo kết quả */
.zbf .zbf-alert{margin:14px 0 0;padding:11px 14px;border-radius:7px;font-size:14px;line-height:1.45}
.zbf .zbf-alert[hidden]{display:none}
.zbf .zbf-alert.is-ok{color:#0f5132;background:#e8f6ee;border:1px solid #b9e2c9}
.zbf .zbf-alert.is-err{color:#842029;background:#fdeeee;border:1px solid #f3c3c3}

/* Honeypot chống spam */
.zbf .zbf-hp{position:absolute!important;left:-9999px!important;width:1px;height:1px;overflow:hidden}

/* Khung form rộng (máy tính, tablet): 2 cột */
@container (min-width:560px){
  .zbf .zbf-card{padding:26px 16px 20px}
  .zbf .zbf-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .zbf .zbf-input{font-size:14.5px}
}
/* Trình duyệt cũ không hỗ trợ container query */
@supports not (container-type:inline-size){
  @media (min-width:640px){
    .zbf .zbf-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  }
}
@media (prefers-reduced-motion:reduce){
  .zbf .zbf-input,.zbf .zbf-btn{transition:none}
  .zbf .zbf-btn.is-loading::before{animation-duration:2s}
}