:root {
  color-scheme: dark;
  --background: #0b191c;
  --surface: #152c2e;
  --line: #345355;
  --text: #f2faf7;
  --muted: #b5ceca;
  --mint: #a8f2d5;
  --ink: #12302a;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0;
  background: radial-gradient(ellipse at 50% 0%, #193638 0, var(--background) 580px);
  color: var(--text);
  font: 17px/1.5 system-ui, sans-serif;
}
main { width: min(100%, 480px); margin: auto; padding: 30px 24px 44px; }
header { display: flex; align-items: center; gap: 11px; font-size: 22px; font-weight: 700; }
header img { border-radius: 12px; }
header small {
  margin-left: auto;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 4px 10px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mint);
}
.signal {
  height: 128px;
  margin: 24px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: radial-gradient(ellipse, #1e514a, #122729 76%);
}
.signal i { width: 5px; height: 22px; background: var(--mint); border-radius: 5px; opacity: .82; }
.signal i:nth-child(2n) { height: 39px; }
.signal i:nth-child(3n) { height: 54px; }
.signal i:nth-child(5) { height: 70px; }
h1 { font-size: clamp(31px, 8vw, 43px); letter-spacing: -.045em; line-height: 1.1; margin: 5px 0 12px; }
p { color: var(--muted); margin: 0 0 18px; }
.step { color: var(--mint); margin: 0; font-size: 12px; font-weight: 700; letter-spacing: .12em; }
label { display: block; font-weight: 650; margin: 22px 0 7px; }
input, button, .button { font: inherit; width: 100%; border-radius: 16px; min-height: 54px; }
input { background: var(--surface); color: var(--text); border: 1px solid var(--line); padding: 0 14px; }
input::placeholder { color: var(--muted); }
button, .button { display: grid; place-items: center; background: var(--mint); border: 0; color: var(--ink); font-weight: 750; text-decoration: none; margin-top: 12px; padding: 10px; cursor: pointer; }
button:disabled { opacity: .68; cursor: wait; }
:focus-visible { outline: 2px solid var(--mint); outline-offset: 3px; }
.secondary { background: var(--surface); color: var(--mint); }
#status { margin: 10px 0 14px; color: #ffbcb2; }
details { margin-top: 18px; border-top: 1px solid var(--line); padding-top: 15px; font-size: 15px; }
details p { margin-top: 10px; }
summary, .download { color: var(--mint); }
.download { display: inline-block; margin-top: 14px; font-size: 15px; }