:root {
  --bg: #f6f8fa;
  --card: #ffffff;
  --surface-subtle: #fbfcfe;
  --ink: #1f2328;
  --muted: #656d76;
  --line: #d0d7de;
  --line-soft: #eaeef2;
  --accent: #0969da;
  --accent-soft: #ddf4ff;
  --accent-ink: #0550ae;
  --danger: #cf222e;
  --danger-soft: #ffebe9;
  --ok: #1a7f37;
  --ok-soft: #dafbe1;
  --warn: #9a6700;
  --warn-soft: #fff8c5;
  --radius: 6px;
  --shadow-sm: 0 1px 2px rgba(31, 35, 40, 0.06);
  --shadow-md: 0 8px 24px rgba(31, 35, 40, 0.12);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0d1117;
  --card: #161b22;
  --surface-subtle: #0f141b;
  --ink: #e6edf3;
  --muted: #8b949e;
  --line: #30363d;
  --line-soft: #21262d;
  --accent: #2f81f7;
  --accent-soft: #12263f;
  --accent-ink: #79c0ff;
  --danger: #ff7b72;
  --danger-soft: #3d1719;
  --ok: #3fb950;
  --ok-soft: #12261a;
  --warn: #d29922;
  --warn-soft: #2d220b;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; }
html { background: var(--bg); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { margin: 0.35em 0; line-height: 1.25; }
h1 { font-size: 1.35rem; letter-spacing: -0.025em; }
h2 { font-size: 1rem; letter-spacing: -0.01em; }
h3 { font-size: 0.9rem; }
p { margin: 8px 0; }
.muted { color: var(--muted); }
.small { font-size: 0.85em; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* App chrome: quiet, compact, and easy to scan. */
#topbar {
  display: flex;
  gap: 12px;
  align-items: center;
  min-height: 64px;
  padding: 12px max(20px, calc((100vw - 1400px) / 2));
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
  flex-wrap: wrap;
}
.brand { display: inline-flex; gap: 9px; align-items: center; font-size: 1.05rem; font-weight: 650; letter-spacing: -0.01em; white-space: nowrap; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 27px;
  height: 27px;
  color: #fff;
  background: var(--ink);
  border-radius: 6px;
  font-size: 1.2rem;
  line-height: 1;
}
[data-theme="dark"] .brand-mark { background: #f0f6fc; color: #0d1117; }
.proj-switcher { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.proj-switcher select { min-width: 190px; font-weight: 550; }
#btnNewProject { color: var(--accent-ink); border-color: #54aeff; background: var(--accent-soft); }
#btnNewProject:hover { background: #b6e3ff; }
[data-theme="dark"] #btnNewProject { border-color: #1f6feb; }
[data-theme="dark"] #btnNewProject:hover { background: #1f3b5e; }
.pill {
  margin-left: auto;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--muted);
  border-radius: 999px;
  padding: 5px 11px;
  cursor: pointer;
  font-size: 0.85rem;
  white-space: nowrap;
}
.pill.ok { border-color: #9be9a8; color: var(--ok); background: var(--ok-soft); }
.pill.warn { border-color: #d4a72c; color: var(--warn); background: var(--warn-soft); }
[data-theme="dark"] .pill.ok { border-color: #238636; }
[data-theme="dark"] .pill.warn { border-color: #9e6a03; }
.theme-toggle { display: inline-flex; align-items: center; gap: 6px; padding: 5px 9px; color: var(--muted); box-shadow: none; }
.theme-toggle:hover { color: var(--ink); }
.theme-icon { font-size: 1rem; line-height: 1; }

#tabs {
  display: flex;
  gap: 2px;
  padding: 0 max(20px, calc((100vw - 1400px) / 2));
  background: var(--card);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
}
#tabs button {
  position: relative;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  padding: 12px 14px 13px;
  cursor: pointer;
  font-size: 0.9rem;
  white-space: nowrap;
}
#tabs button:hover { color: var(--ink); background: var(--bg); }
#tabs button.active { color: var(--ink); font-weight: 600; }
#tabs button.active::after { content: ""; position: absolute; left: 10px; right: 10px; bottom: -1px; height: 2px; background: #fd8c73; border-radius: 2px 2px 0 0; }
main { width: min(1400px, calc(100% - 40px)); margin: 22px auto 0; padding: 0 0 56px; }
.tab { display: none; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow-sm); }
.tab.active { display: block; }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; padding: 0 0 16px; margin-bottom: 16px; border-bottom: 1px solid var(--line-soft); }
.section-head h1 { margin: 2px 0 0; }
.eyebrow { color: var(--muted); font-size: 0.72rem; font-weight: 650; letter-spacing: 0.08em; }
.section-note { color: var(--muted); font-size: 0.85rem; padding-bottom: 2px; text-align: right; }

.toolbar { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.space { justify-content: space-between; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
@media (max-width: 900px) {
  #topbar { padding-left: 16px; padding-right: 16px; }
  #tabs { padding-left: 16px; padding-right: 16px; }
  main { width: min(100% - 24px, 1400px); margin-top: 12px; }
  .grid2 { grid-template-columns: 1fr; }
  .chat-layout { grid-template-columns: 1fr !important; }
  .pill { margin-left: 0; }
  .section-head { align-items: flex-start; flex-direction: column; gap: 3px; }
  .section-note { text-align: left; }
}
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin-bottom: 16px; }
.tab > .card { background: var(--card); }

button, select, input[type="text"], input[type="password"], input[type="number"], textarea { font: inherit; }
button {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  border-radius: var(--radius);
  padding: 6px 12px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: border-color .12s ease, background .12s ease, box-shadow .12s ease;
}
button:hover { border-color: #8c959f; background: #f6f8fa; }
button:focus-visible, select:focus-visible, input:focus-visible, textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; box-shadow: 0 1px 0 rgba(31,35,40,.1); }
button.primary:hover { background: var(--accent-ink); border-color: var(--accent-ink); }
button.danger { color: var(--danger); }
button.danger:hover { background: var(--danger-soft); border-color: #ff8182; }
button:disabled { opacity: 0.45; cursor: default; }
input[type="text"], input[type="password"], input[type="number"], select, textarea {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 6px 9px;
  background: var(--card);
  color: var(--ink);
  max-width: 100%;
  box-shadow: inset 0 1px 0 rgba(31,35,40,.03);
}
textarea { width: 100%; min-height: 120px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.85rem; }
label { display: inline-flex; gap: 6px; align-items: center; }
fieldset { border: 1px solid var(--line); border-radius: var(--radius); margin: 0 0 12px; padding: 12px; }
legend { padding: 0 6px; color: var(--muted); font-weight: 600; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 12px; }
.entry { border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; background: var(--card); cursor: pointer; transition: border-color .12s ease, box-shadow .12s ease, transform .12s ease; }
.entry:hover { border-color: #8c959f; box-shadow: var(--shadow-md); transform: translateY(-1px); }
.entry h3 { margin: 0 0 6px; font-size: 0.98rem; }
.entry .meta { font-size: 0.82rem; color: var(--muted); }
.badge { display: inline-block; font-size: 0.75rem; line-height: 1.5; border: 1px solid var(--line); border-radius: 999px; padding: 1px 8px; margin: 4px 3px 0 0; background: var(--bg); color: var(--muted); }
.badge.ok { color: var(--ok); border-color: #9be9a8; background: var(--ok-soft); }
.badge.warn, .badge.stale { color: var(--warn); border-color: #d4a72c; background: var(--warn-soft); }
[data-theme="dark"] .badge.ok { border-color: #238636; }
[data-theme="dark"] .badge.warn, [data-theme="dark"] .badge.stale { border-color: #9e6a03; }

table { border-collapse: collapse; width: 100%; font-size: 0.88rem; }
th, td { border-bottom: 1px solid var(--line-soft); padding: 8px; text-align: left; vertical-align: top; }
th { color: var(--muted); font-weight: 600; background: var(--bg); }
tr:last-child td { border-bottom: 0; }

.chat-layout { display: grid; grid-template-columns: 240px 1fr; gap: 16px; }
.threads .t { display: block; width: 100%; text-align: left; margin-bottom: 6px; box-shadow: none; }
.threads .t.active { border-color: var(--accent); color: var(--accent-ink); background: var(--accent-soft); font-weight: 600; }
#messages { min-height: 260px; max-height: 52vh; overflow-y: auto; border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; margin: 10px 0; background: var(--surface-subtle); }
.msg { margin: 0 0 10px; padding: 9px 11px; border-radius: var(--radius); max-width: 90%; white-space: pre-wrap; word-break: break-word; border: 1px solid transparent; }
.msg.user { background: var(--accent-soft); border-color: #b6e3ff; margin-left: auto; }
.msg.assistant { background: var(--card); border-color: var(--line); }
.msg.system { background: var(--warn-soft); border-color: #f1e05a; font-size: 0.85em; color: var(--muted); }
[data-theme="dark"] .msg.user { border-color: #1f6feb; }
[data-theme="dark"] .msg.system { border-color: #9e6a03; }
#chatForm input { flex: 1; min-width: 200px; }

#drawer { position: fixed; top: 0; right: 0; bottom: 0; width: min(560px, 94vw); background: var(--card); border-left: 1px solid var(--line); box-shadow: -8px 0 24px rgba(31,35,40,.16); z-index: 30; padding: 22px; overflow-y: auto; }
#drawer[hidden] { display: none; }
#drawer pre.essay { white-space: pre-wrap; background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; }

#modalRoot:empty { display: none; }
.modal-back { position: fixed; inset: 0; background: rgba(31,35,40,.45); z-index: 40; display: flex; align-items: center; justify-content: center; padding: 16px; }
.modal { background: var(--card); border: 1px solid var(--line); box-shadow: var(--shadow-md); border-radius: 8px; padding: 22px; width: min(620px, 96vw); max-height: 90vh; overflow-y: auto; }

#toasts { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); z-index: 50; display: flex; flex-direction: column; gap: 8px; align-items: center; }
.toast { background: var(--ink); color: #fff; border-radius: var(--radius); padding: 8px 14px; font-size: 0.9rem; box-shadow: var(--shadow-md); }
.toast.error { background: var(--danger); }

.progress-row { display: flex; gap: 8px; align-items: center; padding: 7px 0; border-bottom: 1px dashed var(--line); font-size: 0.9rem; }
.progress-row .st { margin-left: auto; }
.spin { display: inline-block; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.bar { height: 8px; background: var(--line-soft); border-radius: 999px; overflow: hidden; margin: 10px 0; }
.bar > i { display: block; height: 100%; background: var(--accent); width: 0; transition: width 0.2s; }

.chart-card svg { width: 100%; height: auto; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); }
.chart-btns { display: flex; gap: 6px; margin-top: 8px; }
.hint { font-size: 0.85em; color: var(--muted); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.85em; }