:root {
  --bg-start: #f8fbff;
  --bg-end: #e8f0ff;
  --ink: #10182f;
  --muted: #5a6378;
  --line: #d8e0ee;
  --card: #ffffff;
  --primary: #0f62fe;
  --primary-ink: #ffffff;
  --ok: #15803d;
  --warn: #b45309;
  --err: #b91c1c;
  --shadow: 0 18px 45px rgba(30, 55, 120, 0.12);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "IBM Plex Sans", "Avenir Next", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 92% 10%, #ffd89c 0, #ffd89c 17%, transparent 18%),
    radial-gradient(circle at 8% 85%, #cde6ff 0, #cde6ff 22%, transparent 23%),
    linear-gradient(145deg, var(--bg-start), var(--bg-end));
}

.page {
  width: min(960px, 92vw);
  margin: 34px auto;
  display: grid;
  gap: 20px;
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 24px;
  box-shadow: var(--shadow);
  animation: appear 360ms ease-out;
}

.eyebrow {
  margin: 0;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font: 700 0.78rem/1.2 "JetBrains Mono", "Menlo", monospace;
  color: var(--primary);
}

h1 {
  margin: 10px 0 0;
  font: 700 clamp(1.6rem, 2.6vw, 2.2rem)/1.15 "Space Grotesk", "Avenir Next", sans-serif;
}

.subtitle {
  margin: 12px 0 0;
  color: var(--muted);
}

.start-form {
  margin-top: 24px;
}

.start-form label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
}

.form-row {
  display: flex;
  gap: 10px;
}

input {
  flex: 1;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  font: 500 0.96rem/1.2 "JetBrains Mono", "Menlo", monospace;
  color: var(--ink);
}

input:focus {
  outline: 2px solid #c1d7ff;
  border-color: var(--primary);
}

button {
  border: 0;
  border-radius: 12px;
  padding: 0 18px;
  min-width: 118px;
  background: linear-gradient(135deg, #0f62fe, #2f7bff);
  color: var(--primary-ink);
  font: 700 0.95rem/1 "IBM Plex Sans", "Avenir Next", sans-serif;
  cursor: pointer;
  transition: transform 150ms ease, filter 150ms ease;
}

button:hover {
  transform: translateY(-1px);
  filter: brightness(1.04);
}

button:disabled {
  cursor: wait;
  opacity: 0.7;
  transform: none;
}

.hint {
  margin: 10px 0 0;
  font-size: 0.86rem;
  color: var(--muted);
}

.output {
  display: grid;
  gap: 14px;
}

.status-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.badge {
  border-radius: 999px;
  padding: 6px 12px;
  font: 700 0.77rem/1 "JetBrains Mono", "Menlo", monospace;
  letter-spacing: 0.04em;
  background: #ebf3ff;
  color: #1148a1;
}

.badge.is-ok {
  background: #dff8e8;
  color: var(--ok);
}

.badge.is-warn {
  background: #fff4d8;
  color: var(--warn);
}

.badge.is-err {
  background: #ffe5e5;
  color: var(--err);
}

.timestamp {
  color: var(--muted);
  font-size: 0.85rem;
}

.status-message {
  margin: 0;
  font-size: 1rem;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.links a {
  color: #0b4cca;
  text-underline-offset: 2px;
}

.qr-wrap {
  width: min(360px, 100%);
  aspect-ratio: 1 / 1;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: repeating-conic-gradient(from 45deg, #f9fbff 0 25%, #f4f8ff 0 50%)
    50% / 18px 18px;
  display: grid;
  place-items: center;
  overflow: hidden;
}

#qr-image {
  display: block;
  max-width: 92%;
  max-height: 92%;
  object-fit: contain;
  filter: drop-shadow(0 6px 20px rgba(0, 0, 0, 0.12));
}

#qr-image:not([src]),
#qr-image[src=""] {
  display: none;
}

@media (max-width: 640px) {
  .page {
    width: min(960px, 95vw);
    margin: 16px auto;
  }

  .panel {
    padding: 18px;
    border-radius: 16px;
  }

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

  button {
    min-height: 44px;
  }
}

@keyframes appear {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}