/* Dr.Air Solution Finder — form 4 thông số (shortcode [drair_form])
   Khung 760 × ~460 px. Bố cục theo bề rộng của chính form (container query),
   nên đặt trong cột hẹp hay rộng đều tự xếp đúng. */
.daf{--daf-blue:#194890;--daf-blue-2:#1565c0;--daf-navy:#0f2a5c;--daf-line:#dfe7f2;--daf-muted:#5d6a80;--daf-bg:#f6f9fd;--daf-text:#13151b;
  box-sizing:border-box;width:100%;max-width:760px;margin:0 auto;padding:26px 30px 20px;background:#fff;border-radius:16px;
  box-shadow:0 1px 3px rgba(0,25,76,.05),0 12px 32px rgba(0,25,76,.09);color:var(--daf-text);
  font-family:"Manrope","Inter",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;font-size:14px;line-height:1.35;
  container-type:inline-size;container-name:daf}
.daf *,.daf *::before,.daf *::after{box-sizing:border-box}
.daf-head{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:24px}
.daf-title{margin:0;padding:0;font-size:26px;line-height:1.2;font-weight:800;letter-spacing:-.01em;color:var(--daf-navy)}
.daf-sub{margin:5px 0 0;padding:0;font-size:14.5px;color:var(--daf-muted)}
.daf-badge{display:flex;align-items:center;gap:10px;flex:none;color:#7b8798;font-size:12px;font-weight:600}
.daf-badge i{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:11px;background:var(--daf-bg);color:var(--daf-blue)}
.daf-badge svg{width:19px;height:19px}
.daf-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.daf-col{min-width:0}
.daf-label{display:block;margin:0 0 10px;font-size:13.5px;font-weight:800;letter-spacing:.02em;text-transform:uppercase;color:var(--daf-navy)}
.daf-label-gap{margin-top:22px}
.daf-select{position:relative}
.daf-select select{width:100%;height:48px;margin:0;padding:0 38px 0 13px;border:1px solid var(--daf-line);border-radius:9px;background:#fff;font:inherit;font-size:15.5px;font-weight:600;color:var(--daf-text);
  -webkit-appearance:none;appearance:none;cursor:pointer}
.daf-select::after{content:"";position:absolute;right:15px;top:50%;width:8px;height:8px;border-right:2px solid #4b5563;border-bottom:2px solid #4b5563;transform:translateY(-70%) rotate(45deg);pointer-events:none}
.daf-select select:focus{outline:none;border-color:var(--daf-blue);box-shadow:0 0 0 3px rgba(25,72,144,.15)}
.daf-checks{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.daf-check{position:relative;display:flex;align-items:center;gap:9px;min-height:50px;margin:0;padding:6px 10px;border:1px solid var(--daf-line);border-radius:9px;background:#fff;cursor:pointer;font-size:14px;font-weight:500;line-height:1.25;transition:.15s;user-select:none}
.daf-check:hover{border-color:#b8c7e0}
.daf-check.on{background:var(--daf-bg);border-color:#c5d5f1}
.daf-check input{position:absolute;opacity:0;width:0;height:0;margin:0}
.daf-box{flex:none;width:18px;height:18px;border:2px solid #c9d4e5;border-radius:4px;background:#fff;position:relative;transition:.15s}
.daf-check.on .daf-box{background:var(--daf-blue);border-color:var(--daf-blue)}
.daf-check.on .daf-box::after{content:"";position:absolute;left:4px;top:0;width:6px;height:10px;border:solid #fff;border-width:0 2px 2px 0;transform:rotate(45deg)}
.daf-check input:focus-visible+.daf-box{box-shadow:0 0 0 3px rgba(25,72,144,.25)}
.daf-card{padding:16px 16px 15px;border:1px solid var(--daf-line);border-radius:12px;background:var(--daf-bg);margin-bottom:16px}
.daf-row{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:9px}
.daf-row .daf-label{margin:0;white-space:nowrap}
.daf-num{display:flex;align-items:center;gap:7px}
.daf-num input{width:84px;height:38px;margin:0;padding:0 10px;border:1px solid var(--daf-line);border-radius:7px;background:#fff;font:inherit;font-size:17px;font-weight:700;text-align:right;color:var(--daf-text);-moz-appearance:textfield}
.daf-num input::-webkit-outer-spin-button,.daf-num input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.daf-num input:focus{outline:none;border-color:var(--daf-blue);box-shadow:0 0 0 3px rgba(25,72,144,.15)}
.daf-num span{font-size:13.5px;color:var(--daf-muted);font-weight:600}
.daf-num-wide input{flex:1;width:auto;height:42px;text-align:left;font-size:17px}
.daf-range{display:block;width:100%;margin:6px 0 0;height:6px;border-radius:3px;background:#dfe5ee;-webkit-appearance:none;appearance:none;cursor:pointer}
.daf-range::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:20px;height:20px;border-radius:50%;background:var(--daf-blue-2);border:3px solid #fff;box-shadow:0 0 0 2px var(--daf-blue-2),0 1px 4px rgba(0,25,76,.3)}
.daf-range::-moz-range-thumb{width:14px;height:14px;border-radius:50%;background:var(--daf-blue-2);border:3px solid #fff;box-shadow:0 0 0 2px var(--daf-blue-2)}
.daf-ticks{display:flex;justify-content:space-between;margin-top:8px;font-size:11.5px;line-height:1.2;color:#8b95a7}
.daf-vol{font-size:13px;color:var(--daf-muted);white-space:nowrap}
.daf-vol b{font-size:16px;color:var(--daf-navy);margin-left:3px}
.daf-btn{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;height:56px;margin:0;padding:0 14px;border:0;border-radius:11px;cursor:pointer;
  background:linear-gradient(90deg,#0f3d8a 0%,#1a63c0 100%);color:#fff;font:inherit;font-size:15.5px;font-weight:800;letter-spacing:.02em;text-transform:uppercase;line-height:1;white-space:nowrap;
  box-shadow:0 8px 20px rgba(25,72,144,.28);transition:.15s}
.daf-btn svg{width:18px;height:18px;flex:none}
.daf-btn:hover{filter:brightness(1.06);transform:translateY(-1px)}
.daf-btn:active{transform:translateY(0)}
.daf-note{margin:20px 0 0;padding:0;text-align:center;font-size:12px;font-style:italic;color:#8b95a7}

/* Form hẹp (cột bên, điện thoại): xếp 1 cột */
@container daf (max-width:600px){
  .daf-grid{grid-template-columns:1fr;gap:14px}
  .daf-badge span{display:none}
}
@container daf (max-width:360px){
  .daf-checks{grid-template-columns:1fr}
  .daf-row{flex-wrap:wrap}
}
/* Trình duyệt cũ không hỗ trợ container query */
@supports not (container-type:inline-size){
  @media (max-width:640px){
    .daf-grid{grid-template-columns:1fr;gap:14px}
    .daf-badge span{display:none}
  }
}
@media (max-width:640px){ .daf{padding:18px 16px 14px} .daf-title{font-size:22px} }