:root {
  --bg: #0e1116;
  --panel: #161b22;
  --muted: #8b949e;
  --text: #e6edf3;
  --accent: #2f81f7;
  --accent-2: #3fb950;
  --danger: #f85149;
  --bubble-user: #1f6feb22;
  --bubble-assistant: #30363d;
  --radius: 10px;
  --shadow: 0 8px 24px rgba(0,0,0,0.25);
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: linear-gradient(180deg, #0e1116 0%, #0b0e13 100%);
  color: var(--text);
  display: flex;
  flex-direction: column;
}

.app-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: rgba(22,27,34,0.8);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid #21262d;
}

.app-header h1 {
  font-size: 16px;
  margin: 0;
  letter-spacing: 0.3px;
  color: var(--text);
  font-weight: 600;
}

.status {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--muted);
  box-shadow: 0 0 0 1px #21262d inset, 0 0 8px rgba(0,0,0,0.35);
}
.status.ok { background: var(--accent-2); box-shadow: 0 0 0 1px #2e7d32 inset, 0 0 16px rgba(63,185,80,0.6); }
.status.err { background: var(--danger); box-shadow: 0 0 0 1px #7f1d1d inset, 0 0 16px rgba(248,81,73,0.6); }

.container {
  width: 100%;
  max-width: 900px;
  margin: 18px auto 24px;
  padding: 0 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1 1 auto;
}

.chat {
  background: var(--panel);
  border: 1px solid #21262d;
  border-radius: var(--radius);
  min-height: 420px;
  max-height: calc(100vh - 230px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
}

.messages {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.msg {
  display: flex;
  align-items: flex-start;
}

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

.msg .bubble {
  max-width: 78%;
  padding: 10px 12px;
  line-height: 1.35;
  border-radius: 14px;
  font-size: 14px;
  border: 1px solid #30363d;
  word-wrap: break-word;
  word-break: break-word;
  white-space: pre-wrap;
}

.msg-user .bubble {
  background: var(--bubble-user);
  border-color: #1f6feb55;
  color: var(--text);
}

.msg-assistant .bubble {
  background: var(--bubble-assistant);
  border-color: #30363d;
  color: var(--text);
}

.input-row {
  display: flex;
  gap: 10px;
  background: var(--panel);
  border: 1px solid #21262d;
  border-radius: var(--radius);
  padding: 10px;
  box-shadow: var(--shadow);
}

.input-row input[type="text"] {
  flex: 1 1 auto;
  background: #0d1117;
  color: var(--text);
  border: 1px solid #30363d;
  border-radius: 8px;
  padding: 12px 12px;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.input-row input[type="text"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(47,129,247,0.25);
}

.input-row button {
  flex: 0 0 auto;
  background: linear-gradient(180deg, #238636 0%, #2ea043 100%);
  color: #fff;
  border: 1px solid #2ea043;
  border-radius: 8px;
  padding: 0 16px;
  font-weight: 600;
  cursor: pointer;
  min-width: 92px;
  transition: transform 0.05s ease-in-out, filter 0.2s ease;
}

.input-row button:hover { filter: brightness(1.05); }
.input-row button:active { transform: translateY(1px); }
.input-row button:disabled {
  cursor: not-allowed;
  opacity: 0.7;
  filter: grayscale(0.2);
}

@media (max-width: 640px) {
  .messages { padding: 12px; }
  .msg .bubble { max-width: 90%; }
}