:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --line: #d9dce3;
  --text: #0f172a;
  --muted: #4b5563;
  --accent: #0f766e;
  --accent-dark: #115e59;
  --error: #b91c1c;
  --pending: #9a6700;
  --running: #075985;
  --completed: #166534;
  --failed: #991b1b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  background: radial-gradient(circle at 20% -10%, #dbeafe 0%, #f6f7f9 45%, #eef2ff 100%);
  font-family: "Avenir Next", "Segoe UI", sans-serif;
}

a {
  color: var(--accent-dark);
}

.muted {
  color: var(--muted);
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 340px 1fr;
}

.sidebar {
  border-right: 1px solid var(--line);
  background: #fbfdff;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.sidebar-header h1 {
  margin: 0;
  font-size: 1.4rem;
}

.sidebar-header p {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.submit-form,
.stack {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

input,
button {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.58rem 0.68rem;
  font: inherit;
}

button {
  cursor: pointer;
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

button:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

button.ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.chat-list {
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.chat-item {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.6rem;
}

.chat-item.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.chat-title {
  font-weight: 600;
}

.chat-meta {
  font-size: 0.78rem;
  color: var(--muted);
}

.main-panel {
  padding: 1.2rem;
}

.main-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.main-header h2 {
  margin: 0;
}

.card,
.empty-state,
.auth-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  margin-top: 1rem;
}

.status-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  align-items: center;
  margin-bottom: 0.9rem;
  font-size: 0.92rem;
}

.badge {
  border-radius: 999px;
  padding: 0.2rem 0.65rem;
  color: #fff;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.badge-pending {
  background: var(--pending);
}

.badge-running {
  background: var(--running);
}

.badge-completed {
  background: var(--completed);
}

.badge-failed {
  background: var(--failed);
}

.rename-form {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.rename-form input {
  flex: 1;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.file-list {
  margin-top: 0.25rem;
  padding-left: 1rem;
}

.error-text {
  margin: 0;
  padding: 0.8rem;
  border-radius: 8px;
  border: 1px solid #fecaca;
  color: var(--error);
  background: #fff1f2;
  white-space: pre-wrap;
  word-break: break-word;
}

.alert {
  border-radius: 10px;
  padding: 0.7rem 0.85rem;
  margin-top: 0.7rem;
}

.alert-error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: var(--error);
}

.empty-list {
  border: 1px dashed var(--line);
  border-radius: 8px;
  padding: 0.8rem;
  color: var(--muted);
  text-align: center;
}

.auth-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.auth-card {
  width: min(460px, 96vw);
}

@media (max-width: 960px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

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