/* Форма регистрации интереса. На светлой панели (paper) и на тёмной. Состояния: disabled / loading / success / error. */

.form{display:block}
.form__body{display:grid;gap:22px}
.field{display:grid;gap:8px;border:0;padding:0;margin:0;min-width:0}
.field label,.field legend{
  font-family:var(--ff-mono)!important;
  text-transform:uppercase;letter-spacing:.09em;font-size:11px;line-height:1.4;font-weight:400;
  padding:0;
}
.field input[type="text"],
.field input[type="email"],
.field textarea{
  width:100%;
  min-height:52px;
  padding:12px 0;
  font-size:16px;  /* 16px: iOS не зумит */
  background:transparent;
  border:0;
  border-bottom:1px solid currentColor;
  border-radius:var(--r-field);
  color:inherit;
  transition:border-color .25s,box-shadow .25s;
}
.field textarea{min-height:110px;resize:vertical}
.field input::placeholder{color:inherit;opacity:.45}
.field input:focus,.field textarea:focus{outline:none;box-shadow:0 2px 0 0 currentColor;border-bottom-color:currentColor}
.field input:focus-visible,.field textarea:focus-visible{outline:2px solid var(--color-focus-ring);outline-offset:4px}

.field__err{
  min-height:0;margin:0;
  font-size:14px;line-height:1.35;
  color:var(--color-error);
  display:none;
}
.paper .field__err{color:#9a2f28}
.field.is-error .field__err{display:flex;gap:8px;align-items:flex-start}
.field.is-error .field__err::before{
  content:"";flex:none;width:14px;height:14px;margin-top:2px;
  background:
    linear-gradient(45deg,transparent 45%,currentColor 45% 55%,transparent 55%),
    linear-gradient(-45deg,transparent 45%,currentColor 45% 55%,transparent 55%);
}
.field.is-error input[type="text"],.field.is-error input[type="email"]{
  border-bottom:2px solid var(--color-error);
}
.paper .field.is-error input[type="text"],.paper .field.is-error input[type="email"]{border-bottom-color:#9a2f28}

/* переключатель "кто вы": сегменты */
.seg{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border:1px solid currentColor}
.seg label{display:block;position:relative;cursor:pointer;font-family:var(--ff-display)!important;text-transform:none;letter-spacing:0;font-size:14px}
.seg label + label{border-left:1px solid currentColor}
.seg input{position:absolute;opacity:0;inset:0;cursor:pointer}
.seg span{
  display:flex;align-items:center;justify-content:center;gap:8px;
  min-height:48px;padding:0 8px;text-align:center;font-weight:500;
  transition:background-color .25s,color .25s;
}
.seg input:checked + span{background:var(--color-text-inverse);color:var(--color-text);font-weight:700}
.seg input:checked + span::before{content:"";width:6px;height:10px;border:solid currentColor;border-width:0 2px 2px 0;transform:rotate(45deg) translateY(-2px)}
.seg input:focus-visible + span{outline:2px solid var(--color-focus-ring);outline-offset:-4px}
.dark-form .seg input:checked + span{background:var(--color-text);color:var(--color-text-inverse)}

/* согласие: галочка не отмечена заранее, отдельная строка */
.check{display:grid;grid-template-columns:22px 1fr;gap:12px;align-items:start;cursor:pointer;font-size:14px;line-height:1.45}
.check input{position:absolute;opacity:0;width:22px;height:22px;margin:0;cursor:pointer}
.check__box{width:22px;height:22px;border:1px solid currentColor;display:grid;place-items:center;transition:background-color .2s}
.check input:checked + .check__box{background:var(--color-text-inverse)}
.check input:checked + .check__box::after{content:"";width:6px;height:11px;border:solid var(--color-text);border-width:0 2px 2px 0;transform:rotate(45deg) translate(-1px,-1px)}
.check input:focus-visible + .check__box{outline:2px solid var(--color-focus-ring);outline-offset:3px}
.field--check.is-error .check__box{border-width:2px;border-color:#9a2f28}

.form__actions{display:grid;gap:14px;justify-items:start}
.form__note{font-size:14px;line-height:1.4;opacity:.8;max-width:34ch}

/* состояния кнопки */
.form .btn[disabled]{cursor:progress}
.form .btn.is-loading{position:relative;overflow:hidden;cursor:progress}
.form .btn.is-loading::after{
  content:"";position:absolute;left:0;bottom:0;height:3px;width:40%;
  background:var(--color-primary);
  animation:form-run 1s linear infinite;
}
@keyframes form-run{from{transform:translateX(-100%)}to{transform:translateX(250%)}}
.form .btn.is-loading .btn__seg svg{opacity:.25}

/* успех */
.form__done{display:grid;gap:14px;outline:none}
.form__done[hidden]{display:none}
.form__done h2{border-left:4px solid currentColor;padding-left:14px}
.form__done p{max-width:36ch}
.form.is-done .form__body{display:none}

@media (max-width:520px){
  .seg{grid-template-columns:1fr}
  .seg label + label{border-left:0;border-top:1px solid currentColor}
}
@media (prefers-reduced-motion:reduce){
  .form .btn.is-loading::after{animation:none;width:100%}
}