/* ── Кнопки ──────────────────────────────── */
.btn {
  --h: 52px;
  position: relative; isolation: isolate;
  display: inline-flex; align-items: center; justify-content: center; gap: 12px;
  height: var(--h); padding: 0 24px; border-radius: var(--radius-m);
  font-size: 15px; font-weight: 600; letter-spacing: .005em; white-space: nowrap;
  transition: background-color var(--d-2) var(--e-signal), color var(--d-2), border-color var(--d-2), box-shadow var(--d-3) var(--e-signal);
  will-change: transform;
}
.btn--sm { --h: 40px; padding: 0 16px; font-size: 14px; border-radius: 10px; }
.btn--primary { background: var(--v-500); color: #000; box-shadow: 0 0 0 0 var(--v-glow); }
.btn--primary:hover { background: var(--v-400); box-shadow: 0 0 32px -4px var(--v-glow); }
.btn--ghost { color: var(--fg); border: 1px solid var(--line-3); }
.btn--ghost:hover { border-color: var(--fg-3); background: rgb(255 255 255 / .04); }
.btn__arrow { width: 11px; height: 11px; flex: none; position: relative; transition: transform var(--d-3) var(--e-signal); }
.btn__arrow svg { width: 100%; height: 100%; fill: currentColor; }
.btn__arrow::after { /* кільце сигналу, що виходить з курсора */
  content: ""; position: absolute; left: 60%; top: 40%; width: 22px; height: 22px;
  margin: -11px 0 0 -11px; border-radius: 50%; border: 1.5px solid currentColor;
  opacity: 0; transform: scale(.2);
}
.btn:hover .btn__arrow { transform: translate(2px, -2px); }
.btn:hover .btn__arrow::after { animation: ping 900ms var(--e-signal) 1; }
@keyframes ping { 0% { opacity: .9; transform: scale(.2); } 100% { opacity: 0; transform: scale(1.4); } }

.link-arrow {
  display: inline-flex; align-items: center; gap: 10px; font-weight: 500; color: var(--fg);
  border-bottom: 1px solid var(--line-3); padding-bottom: 4px;
  transition: border-color var(--d-2), color var(--d-2);
}
.link-arrow:hover { border-color: var(--v-500); color: var(--v-300); }
.link-arrow .btn__arrow { width: 9px; height: 9px; }

/* ── Перемикач (сегменти) ────────────────── */
.seg {
  position: relative; display: inline-grid; grid-auto-flow: column; grid-auto-columns: 1fr;
  padding: 4px; border-radius: 14px; background: var(--ink-2); border: 1px solid var(--line);
}
.seg__btn {
  position: relative; z-index: 1; height: 44px; padding: 0 22px; border-radius: 10px;
  font-size: 15px; font-weight: 500; color: var(--fg-3); white-space: nowrap;
  transition: color var(--d-3) var(--e-signal);
}
.seg__btn[aria-selected="true"] { color: #000; }
.seg__ind {
  position: absolute; z-index: 0; top: 4px; bottom: 4px; left: 4px; border-radius: 10px;
  background: var(--fg); transition: transform var(--d-3) var(--e-tune), width var(--d-3) var(--e-tune);
}

/* ── Тарифна картка = монітор з логотипа ─────
   рамка відкрита у верхньому правому куті, звідти виходить сигнал */
.tcard {
  --cut: 92px;
  position: relative; isolation: isolate;
  padding: 30px 30px 28px; border-radius: var(--radius-l);
  background: linear-gradient(180deg, var(--ink-1), var(--ink-0) 70%);
  display: flex; flex-direction: column; min-height: 370px;
}
.tcard::before { /* рамка монітора з розривом */
  content: ""; position: absolute; inset: 0; border-radius: inherit; z-index: -1;
  border: 1px solid var(--line-2); pointer-events: none;
  -webkit-mask: linear-gradient(#000 0 0) left top / calc(100% - var(--cut)) 100% no-repeat,
                linear-gradient(#000 0 0) right bottom / var(--cut) calc(100% - var(--cut)) no-repeat;
          mask: linear-gradient(#000 0 0) left top / calc(100% - var(--cut)) 100% no-repeat,
                linear-gradient(#000 0 0) right bottom / var(--cut) calc(100% - var(--cut)) no-repeat;
  transition: border-color var(--d-3) var(--e-signal);
}
.tcard::after { /* світло за курсором */
  content: ""; position: absolute; inset: 0; border-radius: inherit; z-index: -1; pointer-events: none;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 0%), rgb(177 77 255 / .10), transparent 60%);
  opacity: 0; transition: opacity var(--d-3) var(--e-signal);
}
.tcard:hover::before { border-color: var(--line-3); }
.tcard:hover::after { opacity: 1; }
.tcard__rings { position: absolute; top: -6px; right: -6px; width: 104px; height: 104px; pointer-events: none; }
.tcard__rings path:not(.cur) { fill: none; stroke-linecap: round; stroke-width: 3; }
.tcard__rings .cur { stroke: #000; stroke-width: 2.5; paint-order: stroke; }
.tcard__rings .trk { stroke: var(--line-2); }
.tcard__rings .lit { stroke: var(--v-500); filter: drop-shadow(0 0 5px rgb(177 77 255 / .7)); }
.tcard__name { font-size: 22px; color: var(--fg); letter-spacing: .02em; }
.tcard__for { font-size: 15px; line-height: 1.45; color: var(--fg-3); margin-top: 10px; max-width: calc(100% - 64px); text-wrap: pretty; }
.tcard__speed { margin-top: auto; padding-top: 40px; display: flex; align-items: baseline; gap: 10px; }
.tcard__speed .data { font-size: var(--fs-num-card); line-height: .78; color: var(--fg); }
.tcard__speed span:last-child { font-size: 17px; color: var(--fg-2); font-weight: 500; }
.tcard__rule { height: 1px; background: var(--line-2); margin: 26px 0 22px; position: relative; }
.tcard__rule::after { content: ""; position: absolute; left: 0; top: -3px; width: 7px; height: 7px; background: var(--line-3); transition: background var(--d-3), transform var(--d-4) var(--e-signal); }
.tcard:hover .tcard__rule::after { background: var(--v-500); transform: translateX(var(--rule-w, 200px)); }
.tcard__foot { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.tcard__price { display: flex; align-items: baseline; gap: 8px; }
.tcard__price .data { font-size: var(--fs-num-price); line-height: 1; }
.tcard__price span:last-child { font-size: 14px; color: var(--fg-3); }

/* ── Поля форми ──────────────────────────── */
.field { position: relative; display: block; }
.field__input {
  width: 100%; height: 64px; padding: 24px 0 8px; background: transparent;
  border: 0; border-bottom: 1px solid var(--line-3); border-radius: 0;
  font-size: 18px; color: var(--fg); outline: none; appearance: none;
}
.field__label {
  position: absolute; left: 0; top: 22px; font-size: 18px; color: var(--fg-3);
  pointer-events: none; transform-origin: left top;
  transition: transform var(--d-3) var(--e-signal), color var(--d-3);
}
.field__input:focus + .field__label,
.field__input:not(:placeholder-shown) + .field__label,
.field--select .field__label { transform: translateY(-18px) scale(.72); color: var(--fg-2); }
.field__line { /* сигнал пробігає по лінії при фокусі; top — рівно по нижній межі input */
  position: absolute; left: 0; right: 0; top: 63px; height: 1px; background: var(--v-500);
  transform: scaleX(0); transform-origin: left; transition: transform var(--d-4) var(--e-signal);
  box-shadow: 0 0 10px var(--v-glow);
}
.field__input:focus ~ .field__line { transform: scaleX(1); }
.field__input:focus-visible { outline: none; }
.field--select select { cursor: pointer; padding-right: 32px; }
.field--select select option, .field--select select optgroup { background: var(--ink-2); color: var(--fg); }
.field__chev { position: absolute; right: 4px; bottom: 22px; width: 12px; height: 12px; color: var(--fg-3); pointer-events: none; }
.field.is-invalid .field__input { border-bottom-color: #ff6b8b; }
.field__err { display: block; min-height: 18px; font-size: 12.5px; color: #ff8fa6; margin-top: 6px; }

/* ── Прогрес сторінки: відкрите кільце ───── */
.prog {
  position: fixed; right: 28px; bottom: 28px; z-index: 40; width: 48px; height: 48px;
  border-radius: 50%; display: grid; place-items: center;
  background: rgb(0 0 0 / .6); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  opacity: 0; transform: translateY(12px); pointer-events: none;
  transition: opacity var(--d-3) var(--e-signal), transform var(--d-3) var(--e-signal);
}
.prog.is-on { opacity: 1; transform: none; pointer-events: auto; }
.prog svg { position: absolute; inset: 0; width: 100%; height: 100%; transform: rotate(0deg); }
.prog .trk { stroke: var(--line-2); }
.prog .val { stroke: var(--v-500); }
.prog__arrow { width: 12px; height: 12px; color: var(--fg); transform: rotate(-45deg); }
@media (max-width: 760px) { .prog { display: none; } }

/* ── Перехід між сторінками: «імпульс» ───── */
.pt { position: fixed; inset: 0; z-index: 100; pointer-events: none; visibility: hidden; }
.pt.is-on { visibility: visible; pointer-events: auto; }
.pt__cover { position: absolute; inset: 0; background: var(--ink-0); }
.pt__ring { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.pt__ring circle { fill: none; stroke: var(--v-500); stroke-width: 1.5; filter: drop-shadow(0 0 8px rgb(177 77 255 / .9)); }
.pt__label {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  display: flex; align-items: center; gap: 14px; opacity: 0;
  font-family: var(--f-display); font-weight: 500; font-size: clamp(28px, 3.4vw, 48px); letter-spacing: -.035em;
}
.pt__label i { width: 9px; height: 9px; background: var(--v-500); box-shadow: 0 0 14px var(--v-glow); }