:root {
  --bg: #05070b;
  --bg2: #0a0d14;
  --panel: #0f141d;
  --panel-2: #131a24;
  --border: #1d2633;
  --text: #e8edf7;
  --muted: #7f8ba3;
  --blue: #4d7cff;
  --blue2: #355ee8;
  --red: #d84d4d;
  --red2: #b63b3b;
  --green: #35c48b;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(77, 124, 255, 0.08), transparent 25%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg2) 100%);
}

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 18px 42px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

/* Навигация — улучшенная контрастность */
.nav {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-shrink: 0;
}

.nav-link {
  color: white;
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 999px;
  background: #1e2b3c;              /* заметно светлее фона страницы */
  border: 1px solid #2f405b;
  font-size: 14px;
  font-weight: 600;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
  white-space: nowrap;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.nav-link:hover {
  background: #2d3f55;              /* ещё светлее при наведении */
  border-color: var(--blue);
  box-shadow: 0 4px 10px rgba(77, 124, 255, 0.2);
}

.title {
  flex-grow: 1;
  text-align: center;
}

.title h1 {
  margin: 0;
  font-size: 34px;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: #f5f7fb;
}

.title p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.pill {
  border: 1px solid var(--border);
  background: #0b1119;
  color: var(--muted);
  padding: 10px 14px;
  border-radius: 999px;
  font-size: 12px;
  white-space: nowrap;
  flex-shrink: 0;
}

.layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 18px;
}

.card {
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.main {
  padding: 22px;
}

.toolbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

button {
  border: 0;
  border-radius: 14px;
  padding: 13px 18px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease, filter 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
  filter: brightness(1.03);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

#startBtn {
  min-width: 128px;
  color: white;
  background: linear-gradient(135deg, var(--blue), var(--blue2));
}

#stopBtn {
  min-width: 128px;
  color: white;
  background: linear-gradient(135deg, var(--red), var(--red2));
}

#clearBtn,
#debugBtn {
  background: #0b1119;
  color: var(--text);
  border: 1px solid var(--border);
}

.status {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #0b1119;
  margin-bottom: 16px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--green);
  flex: 0 0 auto;
  box-shadow: 0 0 0 5px rgba(53, 196, 139, 0.12);
}

#status {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #dfe6f5;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}

.metric {
  padding: 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #0b1119;
}

.metric .k {
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.metric .v {
  font-size: 20px;
  font-weight: 800;
  color: #f1f5ff;
}

.stack {
  display: grid;
  gap: 14px;
  margin-bottom: 16px;
}

.bubble {
  min-height: 104px;
  padding: 16px 18px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: #0b1119;
}

.bubble.client {
  border-left: 3px solid #486fcf;
}

.bubble.ai {
  border-left: 3px solid #2ea977;
}

.bubble .label {
  display: block;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.bubble .text {
  font-size: 18px;
  line-height: 1.45;
  word-break: break-word;
  color: #eef3ff;
}

.audio-box {
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #0b1119;
}

.audio-box .label {
  display: block;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

audio {
  width: 100%;
  filter: saturate(0.85) brightness(0.95);
}

.side {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#debug {
  min-height: 470px;
  max-height: 470px;
  overflow: auto;
  padding: 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #081019;
  color: #bcd1ff;
  white-space: pre-wrap;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  line-height: 1.5;
}

.hidden {
  display: none;
}

@media (max-width: 940px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .metrics {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .nav {
    justify-content: center;
  }

  .title {
    text-align: center;
  }

  .pill {
    align-self: center;
  }
}