:root {
  color-scheme: light dark;
  --bg: #f3f5fa;
  --surface: rgba(255, 255, 255, 0.92);
  --surface-strong: #ffffff;
  --text: #172033;
  --muted: #687189;
  --line: rgba(28, 42, 70, 0.11);
  --accent: #3878f6;
  --accent-strong: #2464df;
  --accent-soft: #eaf1ff;
  --success: #1d9b67;
  --danger: #c83b52;
  --shadow: 0 24px 80px rgba(24, 42, 79, 0.15);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

* { box-sizing: border-box; }

html, body { min-height: 100%; }

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 10%, rgba(77, 129, 255, 0.13), transparent 34rem),
    radial-gradient(circle at 90% 80%, rgba(83, 200, 178, 0.11), transparent 30rem),
    var(--bg);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .28;
  background-image: linear-gradient(rgba(75, 91, 124, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(75, 91, 124, .05) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(to bottom, black, transparent 75%);
}

.shell {
  min-height: 100vh;
  display: grid;
  place-content: center;
  place-items: center;
  gap: 20px;
  padding: 32px 18px;
}

.auth-card {
  position: relative;
  width: min(100%, 460px);
  overflow: hidden;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.auth-card::after {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 3px;
  background: linear-gradient(90deg, #5a8cff, #55c6b3);
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 42px;
}

.brand-mark {
  display: grid;
  grid-template-columns: repeat(3, 5px);
  align-items: end;
  gap: 3px;
  width: 21px;
  height: 20px;
}

.brand-mark span {
  display: block;
  border-radius: 3px;
  background: var(--accent);
}
.brand-mark span:nth-child(1) { height: 9px; opacity: .5; }
.brand-mark span:nth-child(2) { height: 15px; opacity: .75; }
.brand-mark span:nth-child(3) { height: 20px; }

.wordmark { font-weight: 760; letter-spacing: -.02em; }

.secure-pill {
  margin-left: auto;
  padding: 5px 9px;
  color: var(--success);
  border: 1px solid color-mix(in srgb, var(--success), transparent 70%);
  border-radius: 999px;
  background: color-mix(in srgb, var(--success), transparent 91%);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.panel { text-align: center; }
.panel:not(.is-visible)[hidden] { display: none; }
.panel:not(.is-visible)#remembered-panel,
.panel:not(.is-visible)#request-panel { display: none; }

.hero-icon {
  display: grid;
  place-items: center;
  width: 66px;
  height: 66px;
  margin: 0 auto 24px;
  border-radius: 20px;
  transform: rotate(-4deg);
}

.telegram-icon {
  color: white;
  background: linear-gradient(145deg, #58a8ff, #3777f4);
  box-shadow: 0 14px 32px rgba(55, 119, 244, .28);
}

.telegram-icon svg { width: 34px; fill: currentColor; transform: rotate(4deg); }
.success-icon { color: white; background: linear-gradient(145deg, #50c897, #219f70); font-size: 30px; }

.eyebrow {
  margin: 0 0 9px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 780;
  letter-spacing: .11em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(27px, 7vw, 36px);
  line-height: 1.08;
  letter-spacing: -.045em;
}

.lead {
  max-width: 350px;
  margin: 16px auto 28px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
}

form { margin: 0; }

.button {
  min-height: 52px;
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 0 18px;
  border: 0;
  border-radius: 15px;
  font: inherit;
  font-weight: 720;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.button:hover { transform: translateY(-1px); }
.button:active { transform: translateY(0); }
.button:disabled { cursor: wait; opacity: .64; }

.primary {
  color: white;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  box-shadow: 0 12px 24px rgba(46, 105, 229, .22);
}

.secondary { color: var(--text); background: var(--accent-soft); }
.ghost { color: var(--muted); background: transparent; }
.danger { color: var(--danger); }

.privacy-note {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  color: var(--muted);
  font-size: 12px;
}
.privacy-note span { color: var(--success); font-size: 8px; }

.otp-fieldset { margin: 0 0 22px; padding: 0; border: 0; }
.otp-inputs { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; }
.otp-digit {
  min-width: 0;
  height: 58px;
  padding: 0;
  text-align: center;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 13px;
  outline: 0;
  background: var(--surface-strong);
  font: 700 25px/1 ui-monospace, SFMono-Regular, Menlo, monospace;
  transition: border .18s ease, box-shadow .18s ease, transform .18s ease;
}

.otp-digit:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent), transparent 84%);
  transform: translateY(-1px);
}

:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent), transparent 42%); outline-offset: 3px; }

.back-button {
  display: flex;
  gap: 7px;
  margin: -4px 0 28px;
  padding: 5px 0;
  color: var(--muted);
  border: 0;
  background: none;
  font: inherit;
  cursor: pointer;
}

.countdown, .status { color: var(--muted); font-size: 12px; }
.countdown { margin: 18px 0 0; }
.status { min-height: 18px; margin: 18px 0 0; }
.status.is-error { color: var(--danger); }

.destination-grid { display: grid; gap: 10px; margin: 0 0 22px; text-align: left; }
.destination {
  display: grid;
  gap: 3px;
  padding: 14px 16px;
  color: var(--text);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-strong);
}
.destination span { font-weight: 720; }
.destination small { color: var(--muted); }

.logout-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.footer-note { margin: 0; color: var(--muted); text-align: center; font-size: 11px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; }

@media (max-width: 480px) {
  .shell { place-content: start center; padding: 12px; }
  .auth-card { padding: 24px 18px; border-radius: 21px; }
  .brand-row { margin-bottom: 34px; }
  .otp-inputs { gap: 5px; }
  .otp-digit { height: 52px; border-radius: 11px; font-size: 22px; }
  .logout-row { grid-template-columns: 1fr; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1220;
    --surface: rgba(20, 27, 44, .9);
    --surface-strong: #192238;
    --text: #f2f5fc;
    --muted: #9ba6be;
    --line: rgba(213, 224, 255, .12);
    --accent: #6e9cff;
    --accent-strong: #4a7feb;
    --accent-soft: #202e4d;
    --shadow: 0 28px 90px rgba(0, 0, 0, .42);
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}