:root {
  color-scheme: light dark;
  --bg: #0f1419;
  --panel: #171d24;
  --panel-2: #1f2730;
  --border: #2a3441;
  --text: #e7ecf3;
  --muted: #93a1b3;
  --accent: #8b0000;
  --accent-2: #b42318;
  --user: #1e3a5f;
  --assistant: #1a242f;
  --ok: #3d9a6a;
  --warn: #d4a017;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "SF Pro Text", "PingFang SC", "Helvetica Neue", sans-serif;
  background: linear-gradient(180deg, #0b1015, var(--bg));
  color: var(--text);
  min-height: 100vh;
}

.app {
  display: grid;
  grid-template-columns: 280px 1fr;
  grid-template-rows: auto 1fr;
  height: 100vh;
  gap: 0;
}

.header {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: rgba(15, 20, 25, 0.9);
  backdrop-filter: blur(8px);
}

.header h1 {
  margin: 0;
  font-size: 1.25rem;
}

.subtitle {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.875rem;
}

.status {
  font-size: 0.8125rem;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel);
}

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

.sidebar {
  padding: 16px;
  border-right: 1px solid var(--border);
  background: var(--panel);
  overflow: auto;
}

.sidebar label,
.sidebar .label {
  display: block;
  font-size: 0.8125rem;
  color: var(--muted);
  margin-bottom: 8px;
}

#skillSelect {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  margin-bottom: 16px;
}

.session-box {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel-2);
  margin-bottom: 16px;
}

.session-box code {
  display: block;
  font-size: 0.75rem;
  word-break: break-all;
  margin-bottom: 10px;
  color: var(--muted);
}

#newSessionBtn,
.example,
#sendBtn {
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font: inherit;
}

#newSessionBtn {
  width: 100%;
  padding: 8px 12px;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
}

.tips {
  display: grid;
  gap: 8px;
}

.example {
  text-align: left;
  padding: 10px 12px;
  background: rgba(139, 0, 0, 0.15);
  color: var(--text);
  border: 1px solid rgba(139, 0, 0, 0.35);
}

.chat {
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.messages {
  flex: 1;
  overflow: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.message {
  max-width: 860px;
  padding: 14px 16px;
  border-radius: 14px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.message.user {
  align-self: flex-end;
  background: var(--user);
}

.message.assistant {
  align-self: flex-start;
  background: var(--assistant);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0;
}

.skill-meta {
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.55;
  padding-bottom: 8px;
  margin-bottom: 8px;
  border-bottom: 1px dashed rgba(147, 161, 179, 0.35);
}

.skill-meta-toggle {
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 6px;
  opacity: 0.85;
}

.skill-meta-toggle::-webkit-details-marker {
  display: none;
}

.skill-meta-toggle::before {
  content: "▸";
  font-size: 0.625rem;
  transition: transform 0.15s ease;
}

.skill-meta[open] .skill-meta-toggle::before {
  transform: rotate(90deg);
}

.skill-meta-content {
  margin-top: 8px;
  padding-left: 12px;
  white-space: pre-wrap;
  word-break: break-word;
  opacity: 0.88;
}

.message.assistant.is-loading {
  min-width: 72px;
  animation: bubble-pulse 1.6s ease-in-out infinite;
}

.message.assistant.is-loading .skill-body {
  min-height: 24px;
  display: flex;
  align-items: center;
}

@keyframes bubble-pulse {
  0%, 100% { border-color: var(--border); }
  50% { border-color: rgba(147, 161, 179, 0.55); }
}

.typing-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 2px;
  height: 24px;
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--muted);
  opacity: 0.35;
  animation: typing-bounce 1.2s ease-in-out infinite;
}

.typing-indicator span:nth-child(1) { animation-delay: 0s; }
.typing-indicator span:nth-child(2) { animation-delay: 0.15s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.3s; }

@keyframes typing-bounce {
  0%, 60%, 100% {
    transform: translateY(0);
    opacity: 0.35;
  }
  30% {
    transform: translateY(-6px);
    opacity: 1;
  }
}

.skill-body {
  font-size: 0.9375rem;
  line-height: 1.65;
  word-break: break-word;
  color: var(--text);
}

.skill-body.md-rendered {
  white-space: normal;
}

.skill-body.md-rendered .md-p {
  margin: 0 0 0.75em;
}

.skill-body.md-rendered .md-p:last-child {
  margin-bottom: 0;
}

.skill-body.md-rendered .md-h {
  margin: 1em 0 0.5em;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.skill-body.md-rendered .md-h:first-child {
  margin-top: 0;
}

.skill-body.md-rendered .md-ul,
.skill-body.md-rendered .md-ol {
  margin: 0.5em 0 0.75em;
  padding-left: 1.4em;
}

.skill-body.md-rendered .md-ul li,
.skill-body.md-rendered .md-ol li {
  margin: 0.35em 0;
}

.skill-body.md-rendered strong {
  font-weight: 600;
  color: var(--text);
}

.skill-body.md-rendered em {
  font-style: italic;
  color: var(--muted);
}

.skill-body.md-rendered .md-code {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.875em;
  padding: 0.1em 0.35em;
  border-radius: 4px;
  background: rgba(147, 161, 179, 0.12);
}

.skill-body.md-rendered .md-pre {
  margin: 0.75em 0;
  padding: 12px 14px;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border);
  overflow-x: auto;
  font-size: 0.8125rem;
  line-height: 1.5;
}

.skill-body.md-rendered .md-pre code {
  white-space: pre-wrap;
  word-break: break-word;
}

.message.system {
  align-self: center;
  background: transparent;
  color: var(--muted);
  font-size: 0.875rem;
  padding: 8px;
}

.composer {
  padding: 16px 20px 20px;
  border-top: 1px solid var(--border);
  background: rgba(15, 20, 25, 0.85);
}

#messageInput {
  width: 100%;
  resize: vertical;
  min-height: 72px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  font: inherit;
}

.composer-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
}

.stream-toggle {
  color: var(--muted);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

#sendBtn {
  padding: 10px 18px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  font-weight: 600;
}

#sendBtn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

@media (max-width: 900px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 1fr;
  }

  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
}