:root {
  --bg: #0b0f14;
  --panel: rgba(255, 255, 255, 0.08);
  --panel-2: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.09);
  --text: #e9f0fa;
  --muted: rgba(233, 240, 250, 0.68);
  --accent: #64d2ff;
  --accent2: #a78bfa;
  --danger: #ff6b6b;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  --radius: 16px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Liberation Sans",
    sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 20% -10%, rgba(100, 210, 255, 0.18), transparent 60%),
    radial-gradient(900px 500px at 90% 10%, rgba(167, 139, 250, 0.16), transparent 65%),
    linear-gradient(180deg, #070a0f, var(--bg));
}

.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;
}

.app {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 16px 60px;
}

.app__header {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: center;
  margin-bottom: 18px;
}

.back {
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--border);
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.18);
}
.back:hover {
  border-color: rgba(100, 210, 255, 0.25);
}

.title h1 {
  font-size: 18px;
  margin: 0;
}
.title p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.card {
  background: linear-gradient(180deg, var(--panel), rgba(255, 255, 255, 0.035));
  border: 1px solid rgba(100, 210, 255, 0.16);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  overflow: hidden;
}

.chat {
  box-shadow:
    0 18px 50px rgba(0, 0, 0, 0.45),
    0 0 0 1px rgba(167, 139, 250, 0.08),
    0 0 40px rgba(100, 210, 255, 0.12);
}

.chat__log {
  height: min(62vh, 560px);
  padding: 18px;
  overflow: auto;
  background: linear-gradient(180deg, rgba(22, 32, 46, 0.78), rgba(11, 15, 20, 0.88));
}

.msg {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 10px;
  padding: 10px 0;
}

.msg__avatar {
  width: 30px;
  height: 30px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
}

.msg--user .msg__avatar {
  background: rgba(100, 210, 255, 0.14);
  border-color: rgba(100, 210, 255, 0.22);
}

.msg--assistant .msg__avatar {
  background: rgba(167, 139, 250, 0.14);
  border-color: rgba(167, 139, 250, 0.22);
}

.msg__bubble {
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  line-height: 1.4;
  white-space: pre-wrap;
  word-break: break-word;
}

.chat__status {
  padding: 10px 18px 0;
  min-height: 34px;
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}

.status__text {
  color: var(--muted);
  font-size: 13px;
}

.status__error {
  color: var(--danger);
  font-size: 13px;
  text-align: right;
}

.chat__form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  padding: 12px 18px 14px;
  border-top: 1px solid var(--border);
  background: rgba(17, 27, 39, 0.72);
}

.chat__input {
  width: 100%;
  padding: 12px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  outline: none;
}

.chat__input:focus {
  border-color: rgba(100, 210, 255, 0.35);
  box-shadow: 0 0 0 4px rgba(100, 210, 255, 0.12);
}

.chat__send {
  padding: 11px 14px;
  border-radius: 12px;
  border: 1px solid rgba(100, 210, 255, 0.22);
  background: linear-gradient(135deg, rgba(100, 210, 255, 0.2), rgba(167, 139, 250, 0.18));
  color: var(--text);
  font-weight: 700;
  cursor: pointer;
}

.chat__send:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

@media (max-width: 520px) {
  .chat__log {
    height: 64vh;
  }
  .chat__form {
    grid-template-columns: 1fr;
  }
  .chat__send {
    width: 100%;
  }
}