:root{--ink:#252525;--muted:#616161;--line:#d6d6d6;--brand:#252525;--accent:#D00E0E;--ok:#15803d;--bad:#b91c1c;--bg:#F3F3F3}
*{box-sizing:border-box}[hidden]{display:none!important}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink);font-size:16px}
header{background:var(--brand);color:#fff;padding:10px 14px;border-bottom:4px solid var(--accent);display:flex;align-items:center;gap:12px}
header img{height:56px;width:auto}
header h1{margin:0;font-size:1.1rem}header p{margin:2px 0 0;font-size:.8rem;opacity:.85}
.preview{background:#fff7d6;color:#7a5b00;font-weight:700;text-align:center;font-size:.8rem;padding:6px;border-bottom:1px solid var(--line)}
nav.tabs{display:flex;background:#fff;border-bottom:1px solid var(--line)}
nav.tabs a{flex:1;text-align:center;padding:11px 6px;color:var(--muted);text-decoration:none;font-weight:600;font-size:.92rem;border-bottom:3px solid transparent}
nav.tabs a.on{color:var(--ink);border-bottom-color:var(--accent)}
main{max-width:640px;margin:0 auto;padding:10px}
.card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin-bottom:12px}
h2{font-size:1rem;margin:0 0 8px}
label{display:block;font-size:.85rem;font-weight:600;margin:8px 0 4px}
label .req{color:var(--bad)}
input,select,textarea{width:100%;padding:11px 10px;border:1px solid var(--line);border-radius:7px;font-size:16px;background:#fff;font-family:inherit}
textarea{min-height:64px}
input:focus,select:focus,textarea:focus{outline:2px solid var(--accent);border-color:var(--accent)}
.invalid{border-color:var(--bad)!important;background:#fff5f5}
.err{color:var(--bad);font-size:.8rem;margin-top:3px}.err:empty{display:none}
.hint{color:var(--muted);font-size:.78rem;margin-top:3px}
.two{display:grid;grid-template-columns:1fr 1fr;gap:0 10px}
.branch{display:inline-block;background:var(--accent);color:#fff;font-weight:800;font-size:1.25rem;padding:4px 12px;border-radius:6px}
.row{border:1px solid var(--line);border-left:5px solid var(--accent);border-radius:8px;padding:8px 12px 12px;margin-bottom:12px;background:#fcfcfa}
.row-head{display:flex;justify-content:space-between;align-items:center}
.row-head strong{font-size:.95rem}
button{font:inherit;cursor:pointer;border-radius:7px;border:1px solid var(--line);padding:10px 14px;background:#fff}
.btn-del{color:var(--bad);border-color:#f3c4c4;padding:10px 16px;font-size:.95rem;min-height:46px;min-width:88px}
.btn-add{border:2px dashed var(--accent);font-weight:600;width:100%}
.btn-submit{background:var(--brand);color:#fff;border:none;font-weight:700;padding:15px;width:100%;font-size:1.05rem;margin-top:4px}
.btn-nil{background:#fff;color:var(--brand);border:2px solid var(--brand);font-weight:700;padding:13px;width:100%;font-size:1rem}
.btn-submit:disabled,.btn-nil:disabled{opacity:.45}
.yn{display:flex;gap:8px}.yn label{flex:1;margin:0;border:1px solid var(--line);border-radius:7px;padding:10px;text-align:center;font-weight:600;background:#fff}
.yn input{position:absolute;opacity:0;width:1px;height:1px}
.yn label:has(input:checked),.yn label.on{background:var(--brand);color:#fff;border-color:var(--brand)}  /* .on = JS fallback for older Android browsers without :has() */
.yn label:focus-within{outline:3px solid var(--accent);outline-offset:2px}
button:focus-visible,a:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.yn.invalid label{border-color:var(--bad);background:#fff5f5}
.banner{border-radius:8px;padding:12px 14px;margin-bottom:12px;font-weight:600}
.banner.bad{background:#fdecec;color:var(--bad);border:1px solid #f3c4c4}
.banner.ok{background:#e8f6ec;color:var(--ok);border:1px solid #bfe3c9}
.banner.info{background:#eef2ff;color:#3730a3;border:1px solid #c7d2fe;font-weight:500}
.banner ul{margin:6px 0 0;padding-left:20px;font-weight:500}
.or{text-align:center;color:var(--muted);font-size:.85rem;margin:10px 0}
fieldset{border:0;padding:0;margin:0}fieldset:disabled{opacity:.5}

/* row layout: phone = one column (name + surname side by side); Windows PC = wide grid */
.row{display:grid;grid-template-columns:1fr 1fr;gap:0 10px}
.row>.row-head,.row>.f{grid-column:span 2}
.row>.f-first,.row>.f-surname{grid-column:span 1}
.f-other>.f{grid-column:auto}
nav.tabs a{font-size:1rem}
@media (min-width:900px){
  body{font-size:17px}
  main{max-width:1100px;padding:18px}
  header img{height:70px} header h1{font-size:1.4rem}
  .row{grid-template-columns:repeat(6,1fr);gap:0 16px;padding:10px 16px 14px}
  .row>.row-head{grid-column:1/-1}
  .row>.f{grid-column:span 2}
  .row>.f-interest,.row>.f-heard,.row>.f-flyer,.row>.f-other{grid-column:span 3}
  .row>.f-time{grid-column:span 1}.row>.f-name{grid-column:span 3}.row>.f-cell{grid-column:span 2}
  body[data-form=calls] .row>.f-remarks{grid-column:span 4}
  body[data-form=calls] .row>.f-cell{grid-column:span 2}
  #send,#nil,.btn-add{max-width:420px;display:block;margin-left:auto;margin-right:auto}
  .or,.hint[style]{text-align:center}
  nav.tabs{justify-content:center}nav.tabs a{flex:0 0 260px}
}