:root {
  color-scheme: light dark;
  --bg: #eef2f8;
  --surface: #ffffff;
  --surface-soft: #f7f9fc;
  --text: #0f172a;
  --muted: #64748b;
  --border: #d8e0eb;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --accent-text: #ffffff;
  --danger: #b42318;
  --danger-soft: #fef3f2;
  --shadow: 0 24px 70px rgba(15, 23, 42, 0.14);
  --focus: #0ea5e9;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #08111f;
    --surface: #0f1a2b;
    --surface-soft: #132137;
    --text: #e8effa;
    --muted: #90a4c0;
    --border: #20304a;
    --accent: #2dd4bf;
    --accent-strong: #5eead4;
    --accent-text: #052e2b;
    --danger: #ff8b7b;
    --danger-soft: #351a1a;
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.5);
    --focus: #38bdf8;
  }
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
  background:
    radial-gradient(circle at 15% 10%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 42%),
    radial-gradient(circle at 85% 90%, color-mix(in srgb, var(--focus) 12%, transparent), transparent 45%),
    var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

button,
input {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.landing {
  width: 100%;
  max-width: 520px;
}

.card {
  background: color-mix(in srgb, var(--surface) 95%, transparent);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: 28px;
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand-mark {
  width: 20px;
  height: 20px;
  border-radius: 6px;
  background:
    linear-gradient(135deg, var(--accent) 0 45%, transparent 45% 55%, var(--focus) 55% 100%);
  box-shadow: 0 0 0 1px var(--border);
}

h1 {
  margin: 18px 0 8px;
  font-size: clamp(1.8rem, 6vw, 2.4rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
}

.lead {
  margin: 0 0 20px;
  color: var(--muted);
}

.error {
  margin: 0 0 16px;
  padding: 11px 13px;
  border-radius: 12px;
  border-left: 4px solid var(--danger);
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 0.9rem;
}

.lookup-form {
  display: flex;
  gap: 8px;
}

.lookup-form input {
  flex: 1 1 auto;
  min-width: 0;
  border: 1px solid var(--border);
  background: var(--surface-soft);
  border-radius: 14px;
  padding: 14px 15px;
  font-size: 1.05rem;
  letter-spacing: 0.03em;
  outline: none;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}

.lookup-form input::placeholder {
  color: var(--muted);
  opacity: 0.8;
}

.lookup-form input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 16%, transparent);
}

.lookup-form button {
  flex: 0 0 auto;
  border: 0;
  border-radius: 14px;
  background: var(--accent);
  color: var(--accent-text);
  padding: 14px 20px;
  font-weight: 700;
  cursor: pointer;
  transition: background 120ms ease, transform 120ms ease;
}

.lookup-form button:hover {
  background: var(--accent-strong);
}

.lookup-form button:active {
  transform: translateY(1px);
}

.hint {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.hint code {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1px 5px;
  color: var(--text);
}

.footer {
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
}

.footer a {
  color: var(--accent);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

@media (max-width: 460px) {
  .card {
    padding: 22px;
    border-radius: 20px;
  }

  .lookup-form {
    flex-direction: column;
  }

  .lookup-form button {
    width: 100%;
    padding: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}

.telegram-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  width: 100%;
  margin: 0 0 18px;
  padding: 13px 18px;
  border-radius: 14px;
  background: #229ed9;
  color: #ffffff;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 8px 20px rgba(34, 158, 217, 0.22);
  transition: background 120ms ease, transform 120ms ease;
}

.telegram-button::before {
  content: "";
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
  clip-path: polygon(12% 52%, 88% 8%, 68% 92%, 46% 63%, 30% 82%, 32% 57%);
}

.telegram-button:hover {
  background: #1b8dc4;
}

.telegram-button:active {
  transform: translateY(1px);
}

.lookup-form {
  margin-top: 4px;
}

.usage {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.usage h2 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.usage ol {
  margin: 0;
  padding-left: 1.35rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.usage li {
  margin: 0 0 8px;
}

.usage code {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1px 5px;
  color: var(--text);
  font-size: 0.82em;
  overflow-wrap: anywhere;
}

.usage .hint {
  margin-top: 12px;
}