:root{
  --container: 465px;

  --font: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;

  --btn-text: 18px;
  --btn-weight: 400;

  --title: 32px;
  --title-weight: 600;

  --header-desc: 12px;

  --radius: 16px;

  --header-h: 78px;
  --header-gap: 10px;

  --group-pad-y: 50px;
  --group-pad-x: 18px;

  --text: #0b0b0b;
  --muted: rgba(0,0,0,.55);

  --btn-bg: #0b0b0b;
  --btn-fg: #ffffff;
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }

body{
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: #ffffff;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
}

a{ color: inherit; text-decoration: none; }

.app{ min-height: 100%; }

/* Header */
.header{
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: env(safe-area-inset-top) 0 0 0;
  background: rgba(255,255,255,0);
  z-index: 50;
}

.header__inner{
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 14px 12px;
}

.header__inner{
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--header-gap);
  align-items: center;
}

.header__left{
  height: var(--header-h);
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid rgba(0,0,0,0.08);
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 12px;
  padding: 7px 14px;
  min-width: 0;
}

.header__logo{
  height: 64px;
  width: auto;
  display: block;
}

.header__desc{
  font-size: var(--header-desc);
  line-height: 1.25;
  color: var(--muted);
  font-weight: 400;
  min-width: 0;
}

.header__right{
  position: relative;
  height: var(--header-h);
}

.lang__toggle{
  width: 100%;
  height: 100%;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid rgba(0,0,0,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 10px 12px;
  cursor: pointer;
  user-select: none;
}

.lang__flag{
  height: 18px;
  width: auto;
  display: block;
}

.lang__code{
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.lang__menu{
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 100%;
  background: rgba(255,255,255,0.98);
  border: 1px solid rgba(0,0,0,0.08);
  border-radius: var(--radius);
  padding: 8px 0;
  display: none;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,0.10);
}

.lang__menu.is-open{ display: block; }

.lang__item{
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  cursor: pointer;
  font-size: 17px;
  user-select: none;

  background: transparent;
  border: 0;
  text-align: left;
  font-family: var(--font);
}

.lang__item:hover{ background: rgba(0,0,0,0.04); }
.lang__item .lang__flag{ height: 18px; }

/* Main layout */
.main{
  padding-top: calc(var(--header-h) + 14px + env(safe-area-inset-top) + 20px);
}

.container{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 14px 28px;
}

.title{
  font-size: var(--title);
  font-weight: var(--title-weight);
  letter-spacing: -0.02em;
  margin: 8px 0 18px;
}

/* Groups */
.group{
  position: relative;
  border-radius: 22px;
  overflow: hidden;
  margin: 18px 0;
  border: 1px solid rgba(0,0,0,0.06);
}

.group--g1{
  background: linear-gradient(45deg, #EEFFEC, #CBFACD);
}
.group--g2{
  background: linear-gradient(45deg, #D3F4FF, #BFE9FE);
}
.group--g3{
  background: linear-gradient(45deg, #FEE7FD, #F6CAF9);
}

.group__content{
  position: relative;
  z-index: 2;
  padding: var(--group-pad-y) var(--group-pad-x);
  display: grid;
  gap: 18px;
}

.group__bg-spin{
  position: absolute;
  inset: -30%;
  background: url("./upload/blue-bg.svg") no-repeat center;
  background-size: 65%;
  opacity: 0.35;
  z-index: 1;
  transform-origin: center;
  animation: spin 22s linear infinite;
  filter: saturate(1.05);
}

@keyframes spin{
  from{ transform: rotate(0deg); }
  to{ transform: rotate(360deg); }
}

/* Buttons */
.btn{
  display: block;
  width: 100%;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 0;
  border-radius: var(--radius);
  padding: 18px 18px;
  font-size: var(--btn-text);
  font-weight: var(--btn-weight);
  line-height: 1.25;
  text-align: center;
  cursor: pointer;
  transition: filter 0.3s ease, transform 0.15s ease;
  user-select: none;
}

.btn:hover{ filter: brightness(1.08); }
.btn:active{ transform: scale(0.99); }

.btn--submit{
  margin-top: 10px;
}

/* Sending state */
.btn.is-sending{
  pointer-events: none;
  opacity: 0.95;
}
.btn.is-sending:active{
  transform: none;
}

/* Footer */
.footer{
  margin-top: 26px;
  border-top: 1px solid rgba(0,0,0,0.08);
  padding-top: 16px;
  display: grid;
  gap: 14px;
  text-align: center;
}

.footer__link{
  background: transparent;
  border: 0;
  padding: 8px 0;
  font: inherit;
  cursor: pointer;
  color: #0b0b0b;
  font-weight: 600;
}

/* Modals (iOS-style) */
.modal{
  position: fixed;
  inset: 0;
  display: block;
  pointer-events: none;
  opacity: 0;
  z-index: 100;
}

.modal.is-open{
  opacity: 1;
  pointer-events: auto;
}

.modal__overlay{
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.35);
  opacity: 0;
  transition: opacity 260ms cubic-bezier(.22,.61,.36,1);
}

.modal.is-open .modal__overlay{
  opacity: 1;
}

.modal__dialog{
  position: relative;
  margin: auto;
  width: min(600px, calc(100vw - 24px));
  max-width: 600px;
  min-width: min(300px, calc(100vw - 24px));
  background: #ffffff;
  border-radius: 26px;
  padding: 26px 22px 22px;
  z-index: 2;
  border: 1px solid rgba(0,0,0,0.08);
  max-height: min(78vh, 740px);
  overflow: auto;
  -webkit-overflow-scrolling: touch;

  transform: translate3d(0, 10px, 0) scale(0.985);
  opacity: 0;
  transition:
    transform 260ms cubic-bezier(.22,.61,.36,1),
    opacity 260ms cubic-bezier(.22,.61,.36,1);
  will-change: transform, opacity;
}

.modal.is-open .modal__dialog{
  transform: translate3d(0, 0, 0) scale(1);
  opacity: 1;
}

.modal.is-closing{
  opacity: 1;
  pointer-events: none;
}

.modal.is-closing .modal__overlay{
  opacity: 0;
}

.modal.is-closing .modal__dialog{
  transform: translate3d(0, 12px, 0) scale(0.985);
  opacity: 0;
}

.modal__close{
  position: absolute;
  top: 14px;
  right: 14px;
  width: 38px;
  height: 38px;
  border-radius: 999px;
  border: 1px solid rgba(0,0,0,0.12);
  background: #f2f2f2;
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 22px;
  line-height: 1;
}

.modal__title{
  margin: 6px 48px 12px 6px;
  font-size: 34px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.modal__text{
  padding: 0 6px 6px;
  color: rgba(0,0,0,0.80);
  font-size: 18px;
  line-height: 1.45;
}

.modal__text h3{
  margin: 18px 0 8px;
  font-size: 20px;
  font-weight: 700;
  color: rgba(0,0,0,0.90);
}

.modal__text ul{
  margin: 10px 0 0 18px;
  padding: 0;
}

.modal__text li{
  margin: 6px 0;
}

/* Form */
.form{
  padding: 0 6px 6px;
  display: grid;
  gap: 14px;
}

.field__input{
  width: 100%;
  border: 1px solid rgba(0,0,0,0.15);
  border-radius: 16px;
  padding: 16px 16px;
  font-size: 18px;
  font-family: var(--font);
  outline: none;
  background: #f7f7f7;
}

.field__input::placeholder{
  color: rgba(0,0,0,0.45);
}

.field__textarea{
  resize: vertical;
  min-height: 110px;
}

.form__note{
  margin: 6px 0 0;
  font-size: 14px;
  color: rgba(0,0,0,0.65);
}

:focus-visible{
  outline: 2px solid rgba(0,0,0,0.25);
  outline-offset: 2px;
}

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

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  .group__bg-spin{ animation: none; }
  .btn{ transition: none; }
  .modal__overlay,
  .modal__dialog{ transition: none; }
}

/* RTL support */
html[dir="rtl"] .header__inner{ direction: rtl; }
html[dir="rtl"] .header__left{ grid-template-columns: 1fr auto; }
html[dir="rtl"] .header__desc{ text-align: right; }
html[dir="rtl"] .modal__title{ margin: 6px 6px 12px 48px; }
html[dir="rtl"] .modal__close{ left: 14px; right: auto; }
html[dir="rtl"] .lang__item{ text-align: right; }