:root {
  --bg: #071014;
  --panel: #0e1b22;
  --panel2: #13242d;
  --border: #24414c;
  --text: #e9f3f6;
  --muted: #9fb2bb;
  --accent: #43b6c6;
  --accent2: #7aa6ff;
  --danger: #ff7777;
  --ok: #70d690;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  background: radial-gradient(circle at top left, #12313b, var(--bg) 45%);
  color: var(--text);
}

.app-shell {
  width: min(1100px, calc(100vw - 32px));
  margin: 24px auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.brand {
  font-size: 32px;
  letter-spacing: 0.04em;
  font-weight: 700;
}

.brand span {
  color: var(--accent);
}

.subtitle {
  color: var(--muted);
  margin-top: 4px;
}

.status {
  border: 1px solid var(--border);
  background: rgba(14, 27, 34, 0.75);
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--muted);
}

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

.status.err {
  color: var(--danger);
}

.panel, .api-box {
  background: linear-gradient(180deg, rgba(19, 36, 45, 0.95), rgba(14, 27, 34, 0.95));
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 18px;
  box-shadow: 0 18px 48px rgba(0,0,0,0.25);
}

.settings-row {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 12px;
  margin-bottom: 14px;
}

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

select, textarea, button {
  font: inherit;
}

select {
  display: block;
  min-width: 220px;
  margin-top: 6px;
  padding: 10px;
  color: var(--text);
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 10px;
}

button {
  border: 1px solid var(--border);
  background: linear-gradient(180deg, #1c5d6b, #164651);
  color: white;
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.chat {
  min-height: 460px;
  max-height: 62vh;
  overflow-y: auto;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(7, 16, 20, 0.55);
}

.msg {
  display: flex;
  margin: 12px 0;
}

.msg.user {
  justify-content: flex-end;
}

.bubble {
  max-width: 82%;
  padding: 12px 14px;
  border-radius: 14px;
  line-height: 1.45;
  white-space: pre-wrap;
}

.msg.assistant .bubble {
  background: #142a34;
  border: 1px solid #254957;
}

.msg.user .bubble {
  background: #1d5360;
  border: 1px solid #34798a;
}

.input-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  margin-top: 14px;
}

textarea {
  resize: vertical;
  min-height: 76px;
  max-height: 220px;
  padding: 12px;
  color: var(--text);
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.api-box {
  margin-top: 16px;
  color: var(--muted);
}

.api-box h2 {
  color: var(--text);
  margin-top: 0;
}

code {
  color: #a8e6ff;
}

@media (max-width: 700px) {
  .topbar, .input-row {
    display: block;
  }

  .status {
    margin-top: 12px;
    display: inline-block;
  }

  .input-row button {
    width: 100%;
    margin-top: 10px;
  }

  .bubble {
    max-width: 96%;
  }
}