:root {
  --bg: #0f172a; --panel: #ffffff; --ink: #0f172a; --muted: #64748b;
  --accent: #0ea5e9; --accent2: #10b981; --border: #e2e8f0; --soft: #f1f5f9;
  --user: #e0f2fe; --bot: #f8fafc; --danger: #ef4444;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink); background: #eef2f7;
}
.hidden { display: none !important; }
code { background: var(--soft); padding: 1px 5px; border-radius: 4px; font-size: .9em; }
.muted { color: var(--muted); }
.small { font-size: .8rem; }

/* Login */
.login-view {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #0f172a, #0e7490);
}
.login-card {
  background: #fff; padding: 44px 40px; border-radius: 18px; text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,.3); max-width: 420px; width: 90%;
}
.login-card .logo { font-size: 56px; }
.login-card h1 { font-size: 1.4rem; margin: 10px 0 4px; }
.login-card .subtitle { color: var(--muted); margin: 0 0 24px; }
.login-card .hint { color: var(--muted); font-size: .8rem; margin-top: 18px; }

.center-view { min-height: 100vh; display: flex; gap: 12px; align-items: center; justify-content: center; color: var(--muted); }
.spinner {
  width: 22px; height: 22px; border: 3px solid var(--border); border-top-color: var(--accent);
  border-radius: 50%; animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Buttons */
.btn { border: 1px solid var(--border); background: #fff; color: var(--ink);
  padding: 8px 14px; border-radius: 9px; cursor: pointer; font-size: .9rem; }
.btn:hover { background: var(--soft); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: #0284c7; }
.btn-ghost { background: transparent; }
.btn-lg { padding: 12px 22px; font-size: 1rem; width: 100%; }

/* App */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 20px; background: var(--bg); color: #fff;
}
.brand { font-weight: 600; display: flex; gap: 8px; align-items: center; }
.topbar-right { display: flex; gap: 14px; align-items: center; }
.user { color: #cbd5e1; font-size: .9rem; }
.topbar .btn-ghost { color: #fff; border-color: #334155; }

.layout { display: grid; grid-template-columns: 380px 1fr; gap: 16px; padding: 16px;
  height: calc(100vh - 56px); }
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: 14px;
  padding: 16px; overflow-y: auto; }
.panel h2 { margin: 0 0 6px; font-size: 1.05rem; }
.block { margin-top: 16px; }
.block-label { display: block; font-size: .82rem; color: var(--muted); margin-bottom: 6px; }
textarea, input[type=number], input[type=file], select {
  width: 100%; font-family: inherit; font-size: .9rem; padding: 8px; border: 1px solid var(--border);
  border-radius: 8px; background: #fff; }
textarea { resize: vertical; font-family: ui-monospace, Menlo, Consolas, monospace; }
.row { display: flex; gap: 8px; margin-top: 8px; align-items: center; }
.row select { width: auto; }
#upload-btn { margin-top: 8px; }
.model-summary { font-size: .85rem; line-height: 1.5; white-space: pre-wrap; }
.model-summary.loaded { color: var(--ink); }

/* Analysis */
.analysis { display: flex; flex-direction: column; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; padding-bottom: 10px;
  border-bottom: 1px solid var(--border); }
.actions label { font-size: .85rem; color: var(--muted); }
.actions input[type=number] { width: 70px; display: inline-block; }
.chips { display: inline-flex; gap: 6px; flex-wrap: wrap; }
.chip { border: 1px solid var(--border); background: var(--soft); border-radius: 999px;
  padding: 4px 12px; font-size: .8rem; cursor: pointer; }
.chip:hover { background: #e2e8f0; }

.stream { flex: 1; overflow-y: auto; padding: 14px 2px; display: flex; flex-direction: column; gap: 12px; }
.msg { max-width: 88%; padding: 10px 14px; border-radius: 12px; font-size: .92rem; line-height: 1.55; }
.msg.user { align-self: flex-end; background: var(--user); }
.msg.bot { align-self: flex-start; background: var(--bot); border: 1px solid var(--border); }
.msg.err { align-self: flex-start; background: #fef2f2; border: 1px solid #fecaca; color: #b91c1c; }
.msg .role { font-size: .72rem; color: var(--muted); margin-bottom: 4px; }
.msg table { border-collapse: collapse; margin: 8px 0; font-size: .85rem; }
.msg th, .msg td { border: 1px solid var(--border); padding: 4px 8px; }
.msg th { background: var(--soft); }
.msg pre { background: var(--soft); padding: 10px; border-radius: 8px; overflow-x: auto; font-size: .8rem; }
.msg.typing { color: var(--muted); }

.spark { display: block; margin-top: 6px; }
.chat-form { display: flex; gap: 8px; padding-top: 10px; border-top: 1px solid var(--border); }
.chat-form textarea { flex: 1; }

@media (max-width: 820px) {
  .layout { grid-template-columns: 1fr; height: auto; }
}