/* ── Back link / nav buttons ────────────────────── */
.back-link {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px 6px 10px; border-radius: 8px;
  font: inherit;
  font-size: 13px; font-weight: 500; color: var(--text-tertiary);
  text-decoration: none; border: 0.5px solid var(--border-default);
  background: var(--bg-primary); flex-shrink: 0; cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
}
.back-link:hover {
  color: var(--primary); border-color: var(--primary);
  background: color-mix(in srgb, var(--primary) 6%, var(--bg-primary));
}
.back-link svg { opacity: 0.8; }

.header-right { display: flex; align-items: center; gap: 8px; }

@media (max-width: 640px) {
  .back-link span { display: none; }
  .back-link { padding: 6px; }
}

/* ── Chat layout ───────────────────────────────── */
.chat-main {
  max-width: 880px;
  margin: 0 auto;
  padding: 28px 16px 96px;
  min-height: calc(100vh - 56px);
}
@media (min-width: 640px) {
  .chat-main { padding: 36px 32px 96px; }
}

.chat-frame {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ── Welcome card ──────────────────────────────── */
.welcome {
  background: var(--card);
  border: 1px solid var(--border-default);
  border-radius: 14px;
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
}
.welcome h2 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}
.welcome p {
  color: var(--text-secondary);
  margin-bottom: 4px;
  font-size: 14.5px;
}
.welcome-sub {
  margin-top: 16px;
  color: var(--text-tertiary);
  font-size: 13px;
}

/* ── Message list ──────────────────────────────── */
.chat-log {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-bottom: 8px;
}

.msg {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 100%;
}

.msg-author {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}
.msg-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, #15b79e 0%, #0e9384 100%);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0;
}

.msg-body {
  color: var(--text-primary);
  font-size: 14.5px;
  line-height: 1.45;
  word-wrap: break-word;
}

/* User messages get a subtle highlight so the eye can scan the convo. */
.msg-user .msg-body {
  background: color-mix(in srgb, var(--primary) 6%, var(--bg-primary));
  border-left: 3px solid var(--primary);
  padding: 8px 12px;
  border-radius: 0 8px 8px 0;
  white-space: pre-wrap;
}

/* Markdown elements inside assistant responses */
.msg-body h1, .msg-body h2, .msg-body h3,
.msg-body h4, .msg-body h5, .msg-body h6 {
  font-weight: 600;
  margin: 8px 0 1px;
  color: var(--text-primary);
  line-height: 1.3;
}
.msg-body h1 { font-size: 17px; }
.msg-body h2 { font-size: 15.5px; }
.msg-body h3 { font-size: 14.5px; }
.msg-body h4, .msg-body h5, .msg-body h6 { font-size: 14px; }
.msg-body h1:first-child, .msg-body h2:first-child, .msg-body h3:first-child {
  margin-top: 0;
}

.msg-body p { margin: 0 0 4px; }
.msg-body p:last-child { margin-bottom: 0; }

.msg-body ul, .msg-body ol { margin: 0 0 4px 22px; }
.msg-body li { margin-bottom: 1px; }
.msg-body li:last-child { margin-bottom: 0; }
.msg-body li > p:first-child { margin-bottom: 1px; }
.msg-body li > ul, .msg-body li > ol { margin-top: 1px; margin-bottom: 1px; }

.msg-body code {
  background: var(--bg-tertiary);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.92em;
  font-family: var(--font-mono, ui-monospace, "SFMono-Regular", monospace);
}
.msg-body pre {
  background: var(--bg-tertiary);
  padding: 10px 12px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 6px 0;
  font-size: 13px;
  border: 1px solid var(--border-default);
  line-height: 1.45;
}
.msg-body pre code {
  background: transparent;
  padding: 0;
  font-size: inherit;
}

.msg-body blockquote {
  margin: 6px 0;
  padding: 2px 0 2px 12px;
  border-left: 3px solid var(--border-strong);
  color: var(--text-secondary);
}

.msg-body strong { font-weight: 600; color: var(--text-primary); }
.msg-body em { font-style: italic; }
.msg-body a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.msg-body a:hover { color: var(--primary-hover); }

.msg-error { color: #b42318; }

/* Loading dots while waiting for the first token */
.msg-typing .msg-body {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 0;
}
.msg-typing .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--text-tertiary);
  animation: dot-bounce 1.2s infinite ease-in-out both;
}
.msg-typing .dot:nth-child(2) { animation-delay: 0.16s; }
.msg-typing .dot:nth-child(3) { animation-delay: 0.32s; }
@keyframes dot-bounce {
  0%, 80%, 100% { transform: scale(0.7); opacity: 0.5; }
  40%           { transform: scale(1.0); opacity: 1; }
}

/* ── Action buttons under assistant messages ──── */
.msg-actions {
  margin-top: 10px;
  display: flex;
  gap: 6px;
}
.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 4px 8px;
  font: inherit;
  font-size: 12px;
  color: var(--text-tertiary);
  cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
}
.action-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-default);
  background: var(--bg-tertiary);
}
.action-btn svg { opacity: 0.7; }

/* ── Sources ───────────────────────────────────── */
.sources {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--border-default);
}
.sources-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 6px;
}
.sources-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.source-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: 999px;
  font-size: 12px;
  color: var(--text-secondary);
  text-decoration: none;
  max-width: 100%;
}
.source-chip svg { flex-shrink: 0; opacity: 0.65; }
.source-chip-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── Starter chips ─────────────────────────────── */
.starter-list {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.starter-list li { margin: 0; }
.starter {
  font: inherit;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-default);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}
.starter:hover {
  background: color-mix(in srgb, var(--primary) 8%, var(--bg-tertiary));
  border-color: color-mix(in srgb, var(--primary) 30%, var(--border-default));
  color: var(--text-primary);
}

/* ── Composer ──────────────────────────────────── */
.chat-form {
  position: sticky;
  bottom: 16px;
  display: flex;
  gap: 8px;
  background: var(--card);
  border: 1px solid var(--border-default);
  border-radius: 14px;
  padding: 8px 8px 8px 16px;
  box-shadow: 0 4px 16px rgb(16 24 40 / 0.06);
  align-items: flex-end;
  margin-top: 16px;
}
.chat-form:focus-within {
  border-color: color-mix(in srgb, var(--primary) 40%, var(--border-default));
  box-shadow: 0 4px 16px rgb(16 24 40 / 0.08),
              0 0 0 3px color-mix(in srgb, var(--primary) 12%, transparent);
}
.chat-input {
  font: inherit;
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  resize: none;
  max-height: 200px;
  color: var(--text-primary);
  padding: 8px 0;
  line-height: 1.5;
}
.chat-input::placeholder { color: var(--text-quaternary); }
.chat-send {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: none;
  background: var(--primary);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: background .15s, opacity .15s;
}
.chat-send:hover:not(:disabled) { background: var(--primary-hover); }
.chat-send:disabled { opacity: 0.5; cursor: not-allowed; }
.chat-hint {
  font-size: 12px;
  color: var(--text-quaternary);
  text-align: center;
  margin-top: 4px;
}