:root {
  color-scheme: dark;
  --bg: #101412;
  --panel: #18211d;
  --panel-strong: #223128;
  --text: #f7fff9;
  --muted: #a9b8af;
  --accent: #ffe34d;
  --accent-hot: #ff4d3d;
  --ok: #58d68d;
  --warn: #ffd166;
  --fail: #ff6b6b;
  --border: #3f5248;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 20px;
  letter-spacing: 0;
}

button,
input {
  font: inherit;
}

button {
  touch-action: manipulation;
}

.shell {
  width: min(920px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: 18px;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 2rem;
  line-height: 1.05;
}

h2 {
  margin-bottom: 12px;
  font-size: 1.2rem;
}

.stack {
  display: grid;
  gap: 18px;
}

.panel {
  border: 2px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  padding: 18px;
}

.login-panel,
.check-panel {
  display: grid;
  gap: 24px;
  margin-top: 10vh;
}

label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-weight: 700;
}

input {
  width: 100%;
  min-height: 64px;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: #07100b;
  color: var(--text);
  padding: 12px 14px;
  font-size: 1.2rem;
}

.primary-action,
.secondary-action {
  min-height: 64px;
  border: 0;
  border-radius: 8px;
  padding: 12px 18px;
  font-weight: 900;
  cursor: pointer;
}

.primary-action {
  background: var(--accent);
  color: #141000;
}

.secondary-action {
  border: 2px solid var(--border);
  background: var(--panel-strong);
  color: var(--text);
}

.wide {
  width: 100%;
}

.radio-layout {
  display: grid;
  gap: 16px;
}

.top-bar {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 14px;
}

.status-line {
  margin-top: 8px;
  color: var(--muted);
  font-weight: 800;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}

.info-block {
  display: grid;
  gap: 6px;
  min-width: 0;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  padding: 14px;
}

.info-block span {
  color: var(--muted);
  font-size: .9rem;
  font-weight: 800;
}

.info-block strong {
  overflow-wrap: anywhere;
  font-size: 1.15rem;
}

.ptt-button {
  width: 100%;
  min-height: clamp(220px, 44vh, 420px);
  border: 4px solid #fff4a3;
  border-radius: 8px;
  background: var(--accent);
  color: #171100;
  font-size: clamp(2.4rem, 8vw, 5rem);
  font-weight: 1000;
  line-height: 1;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
}

.ptt-button:disabled {
  border-color: var(--border);
  background: #4d544f;
  color: #c7d1ca;
  cursor: wait;
}

.ptt-button.transmitting {
  border-color: #ffd6d1;
  background: var(--accent-hot);
  color: #fff;
}

.participants-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.participants-list li {
  overflow-wrap: anywhere;
  border-top: 1px solid var(--border);
  padding-top: 8px;
}

.participants-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.message,
.message-panel {
  border-radius: 8px;
  padding: 12px 14px;
  font-weight: 800;
}

.message-panel:empty {
  display: none;
}

.error,
.fail {
  background: rgba(255, 107, 107, .14);
  color: var(--fail);
}

.ok {
  color: var(--ok);
}

.warn {
  color: var(--warn);
}

.muted {
  color: var(--muted);
}

.hidden {
  display: none;
}

.check-results {
  display: grid;
  gap: 10px;
}

.check-row {
  display: grid;
  grid-template-columns: 86px 1fr;
  gap: 12px;
  align-items: start;
  border-top: 1px solid var(--border);
  padding-top: 10px;
}

.check-row:first-child {
  border-top: 0;
  padding-top: 0;
}

.check-verdict {
  border: 2px solid var(--border);
  border-radius: 8px;
  background: var(--panel-strong);
  padding: 12px;
}

@media (max-width: 640px) {
  body {
    font-size: 18px;
  }

  .shell {
    padding: 12px;
  }

  .top-bar {
    align-items: stretch;
    flex-direction: column;
  }

  .top-bar form,
  .top-bar button {
    width: 100%;
  }

  .info-grid {
    grid-template-columns: 1fr;
  }
}