:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f1f3f6;
  --text: #111827;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-soft: #eef2ff;
  --accent-text: #ffffff;
  --warn-bg: #fffbeb;
  --warn-border: #fcd34d;
  --warn-text: #92400e;
  --error-bg: #fef2f2;
  --error-border: #fca5a5;
  --error-text: #b91c1c;
  --success: #059669;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --a: #2563eb;
  --b: #9333ea;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.08), 0 4px 16px rgba(16, 24, 40, 0.06);
  --radius: 12px;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --surface: #161b22;
    --surface-2: #1c2230;
    --text: #e6edf3;
    --text-muted: #8b949e;
    --border: #2a313c;
    --border-strong: #3a4250;
    --accent: #818cf8;
    --accent-hover: #a5b4fc;
    --accent-soft: #1e1b4b;
    --accent-text: #0d1117;
    --warn-bg: #2a2111;
    --warn-border: #6b5316;
    --warn-text: #f5d58a;
    --error-bg: #2b1416;
    --error-border: #6e2a2e;
    --error-text: #ff9b94;
    --success: #34d399;
    --danger: #f87171;
    --danger-hover: #fca5a5;
    --a: #60a5fa;
    --b: #c084fc;
    --shadow-sm: none;
    --shadow: 0 0 0 1px var(--border);
  }
}

/* Every element toggled via the `hidden` attribute must actually hide, even when a
   rule below gives it its own `display` (see CLAUDE.md's two CSS-cascade incidents). */
[hidden] { display: none !important; }

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
}

button, input, textarea { font: inherit; color: inherit; }

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

/* ---------- Top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 24px;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand-mark { width: 32px; height: 32px; color: var(--accent); flex-shrink: 0; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; min-width: 0; }
.brand-name { font-weight: 700; letter-spacing: -0.01em; }
.brand-sub { font-size: 12px; color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar-right { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }

.repo-chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; border-radius: 999px;
  background: var(--surface-2); border: 1px solid var(--border);
  font-family: var(--mono); font-size: 13px;
  max-width: 280px;
}
.repo-chip svg { width: 14px; height: 14px; flex-shrink: 0; }
#repo-chip-text { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.pill {
  display: inline-flex; align-items: center;
  padding: 3px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 500;
  background: var(--accent-soft); color: var(--accent);
}
.pill-warn { background: var(--warn-bg); color: var(--warn-text); border: 1px solid var(--warn-border); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 16px; border-radius: 8px;
  border: 1px solid transparent;
  font-weight: 500; font-size: 14px;
  cursor: pointer; white-space: nowrap;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.05s;
}
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: var(--accent-text); }
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }
.btn-ghost { background: transparent; border-color: var(--border-strong); }
.btn-ghost:hover:not(:disabled) { background: var(--surface-2); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover:not(:disabled) { background: var(--danger-hover); }
.btn-small { padding: 5px 10px; font-size: 13px; background: var(--surface); border-color: var(--border-strong); }
.btn-icon { width: 40px; height: 40px; padding: 0; border-radius: 10px; }
.btn-icon svg { width: 18px; height: 18px; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- Layout ---------- */
main { flex: 1; display: flex; flex-direction: column; min-height: 0; }
.screen { flex: 1; display: flex; flex-direction: column; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ---------- Setup ---------- */
.setup-wrap { width: 100%; max-width: 760px; margin: 0 auto; padding: 48px 20px 64px; }
.hero { text-align: center; margin-bottom: 28px; }
.eyebrow {
  display: inline-block; margin-bottom: 12px;
  font-size: 12px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--accent);
}
.hero h1 { margin: 0 0 12px; font-size: clamp(26px, 4vw, 34px); line-height: 1.2; letter-spacing: -0.02em; }
.lead { margin: 0 auto; max-width: 600px; color: var(--text-muted); font-size: 16px; }

.how {
  list-style: none; padding: 0; margin: 0 0 24px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px;
}
.how li {
  display: flex; gap: 10px; align-items: flex-start;
  padding: 14px; border-radius: 10px;
  background: var(--surface); border: 1px solid var(--border);
}
.how p { margin: 2px 0 0; font-size: 13px; color: var(--text-muted); }
.how strong { font-size: 14px; }
.how-n {
  flex-shrink: 0; width: 24px; height: 24px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent);
  font-size: 12px; font-weight: 700;
}

.setup-card { padding: 24px; }
.field-label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 8px; }
.input-group {
  display: flex; align-items: stretch;
  border: 1px solid var(--border-strong); border-radius: 10px;
  background: var(--surface);
  overflow: hidden;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.input-group:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.input-prefix {
  display: flex; align-items: center; padding: 0 4px 0 14px;
  color: var(--text-muted); font-family: var(--mono); font-size: 14px;
}
.input-group input {
  flex: 1; min-width: 0; border: 0; outline: none; background: transparent;
  padding: 12px 8px 12px 0; font-family: var(--mono); font-size: 14px;
}
.input-group .btn { border-radius: 0; margin: 0; }

.examples { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-top: 10px; font-size: 13px; color: var(--text-muted); }
.chip {
  padding: 3px 10px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--surface-2);
  font-family: var(--mono); font-size: 12px; cursor: pointer;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }

.advanced { margin-top: 18px; border-top: 1px solid var(--border); padding-top: 14px; }
.advanced summary { cursor: pointer; font-size: 14px; font-weight: 500; color: var(--text-muted); }
.advanced summary:hover { color: var(--text); }
.advanced-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 12px; }
.advanced-grid label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--text-muted); }
.advanced-grid input {
  padding: 8px 10px; border: 1px solid var(--border-strong); border-radius: 8px;
  background: var(--surface); font-size: 14px;
}
.hint { font-size: 12px; color: var(--text-muted); margin: 8px 0 0; }
.check { display: flex; gap: 8px; align-items: flex-start; margin-top: 14px; font-size: 13px; color: var(--text-muted); cursor: pointer; }
.check input { margin-top: 3px; accent-color: var(--accent); }
.check strong { color: var(--text); }

.notice {
  padding: 12px 14px; border-radius: 10px; font-size: 14px;
  border: 1px solid; margin: 0 0 16px;
}
.notice strong { display: block; margin-bottom: 2px; }
.notice-warn { background: var(--warn-bg); border-color: var(--warn-border); color: var(--warn-text); }
.notice-error { background: var(--error-bg); border-color: var(--error-border); color: var(--error-text); margin: 16px 0 0; }

/* ---------- Progress ---------- */
.progress-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; margin-bottom: 16px; }
.progress-head p { margin: 2px 0 0; font-size: 13px; }
#progress-repo { font-family: var(--mono); font-weight: 500; }
.elapsed { font-family: var(--mono); font-size: 13px; color: var(--text-muted); padding: 2px 8px; border-radius: 6px; background: var(--surface-2); }
.stepper { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 4px; }
.step { display: flex; align-items: center; gap: 12px; padding: 8px 10px; border-radius: 8px; color: var(--text-muted); font-size: 14px; }
.step-icon {
  width: 22px; height: 22px; border-radius: 50%; flex-shrink: 0;
  display: grid; place-items: center;
  border: 2px solid var(--border-strong);
  font-size: 12px; font-weight: 700;
}
.step.done { color: var(--text); }
.step.done .step-icon { background: var(--success); border-color: var(--success); color: #fff; }
.step.active { color: var(--text); background: var(--accent-soft); font-weight: 500; }
.step.active .step-icon { border-color: var(--accent); border-top-color: transparent; animation: spin 0.8s linear infinite; }

@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Chat ---------- */
.chat-screen { min-height: 0; }
.chat-notice { max-width: 920px; width: calc(100% - 40px); margin: 16px auto 0; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.chat-notice strong { display: inline; margin: 0; }

.messages {
  flex: 1;
  width: 100%; max-width: 1100px; margin: 0 auto;
  padding: 24px 20px 16px;
  display: flex; flex-direction: column; gap: 18px;
}

.empty-state { margin: auto; text-align: center; padding: 40px 0; max-width: 640px; }
.empty-state h2 { margin: 0 0 6px; font-size: 22px; letter-spacing: -0.01em; }
.suggestions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 16px; }
.suggestion {
  text-align: left; padding: 12px 14px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface);
  cursor: pointer; font-size: 14px; box-shadow: var(--shadow-sm);
  transition: border-color 0.15s, background 0.15s;
}
.suggestion:hover { border-color: var(--accent); background: var(--accent-soft); }

.msg-user {
  align-self: flex-end; max-width: min(720px, 85%);
  padding: 10px 16px; border-radius: 16px 16px 4px 16px;
  background: var(--accent); color: var(--accent-text);
  white-space: pre-wrap; word-wrap: break-word;
}

.msg-assistant { align-self: stretch; max-width: 860px; }
.msg-meta { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; font-size: 12px; color: var(--text-muted); }
.msg-meta .tag { padding: 2px 8px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--border); font-weight: 500; }
.msg-body {
  padding: 14px 18px; border-radius: 4px 16px 16px 16px;
  background: var(--surface); border: 1px solid var(--border);
}
.msg-note { font-style: italic; color: var(--text-muted); }
.msg-error { border-color: var(--error-border); background: var(--error-bg); color: var(--error-text); }

/* ---------- Arena (pairwise comparison) ---------- */
.arena { align-self: stretch; }
.arena-head { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; margin-bottom: 10px; flex-wrap: wrap; }
.arena-head h3 { margin: 0; font-size: 15px; }
.arena-head span { font-size: 13px; color: var(--text-muted); }
.arena-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; align-items: start; }

.answer-card { display: flex; flex-direction: column; overflow: hidden; }
.answer-card-head {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 10px 16px; border-bottom: 1px solid var(--border);
  font-weight: 600; font-size: 14px;
}
.answer-letter {
  display: inline-grid; place-items: center;
  width: 24px; height: 24px; border-radius: 6px; margin-right: 8px;
  color: #fff; font-size: 13px;
}
.answer-card[data-id="a"] .answer-letter { background: var(--a); }
.answer-card[data-id="b"] .answer-letter { background: var(--b); }
.pipeline-tag { font-family: var(--mono); font-size: 11px; font-weight: 500; padding: 2px 8px; border-radius: 6px; background: var(--warn-bg); color: var(--warn-text); border: 1px solid var(--warn-border); }
.answer-card-body { padding: 14px 16px; max-height: 520px; overflow-y: auto; }

.vote-bar {
  display: grid; grid-template-columns: 1fr auto auto 1fr; gap: 8px;
  margin-top: 12px; padding: 10px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.vote-btn {
  padding: 10px 14px; border-radius: 8px; border: 1px solid var(--border-strong);
  background: var(--surface); cursor: pointer; font-weight: 500; font-size: 14px;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.vote-btn:hover:not(:disabled) { background: var(--surface-2); }
.vote-btn[data-verdict="a"]:hover:not(:disabled) { border-color: var(--a); color: var(--a); }
.vote-btn[data-verdict="b"]:hover:not(:disabled) { border-color: var(--b); color: var(--b); }
.vote-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.skeleton { padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.skeleton-line {
  height: 12px; border-radius: 6px;
  background: linear-gradient(90deg, var(--surface-2) 25%, var(--border) 50%, var(--surface-2) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite;
}
.skeleton-line:nth-child(2) { width: 92%; }
.skeleton-line:nth-child(3) { width: 78%; }
.skeleton-line:nth-child(4) { width: 85%; }
.skeleton-line:nth-child(5) { width: 60%; }
@keyframes shimmer { to { background-position: -200% 0; } }

/* ---------- Markdown content ---------- */
.md > :first-child { margin-top: 0; }
.md > :last-child { margin-bottom: 0; }
.md p, .md ul, .md ol { margin: 0 0 10px; }
.md ul, .md ol { padding-left: 22px; }
.md li { margin: 3px 0; }
.md h1, .md h2, .md h3, .md h4 { margin: 16px 0 8px; font-size: 15px; }
.md a { color: var(--accent); text-decoration: none; word-break: break-word; }
.md a:hover { text-decoration: underline; }
.md code { font-family: var(--mono); font-size: 0.88em; padding: 1px 5px; border-radius: 4px; background: var(--surface-2); }
.md pre { background: var(--surface-2); padding: 12px; border-radius: 8px; overflow-x: auto; }
.md pre code { padding: 0; background: none; }
.md table { border-collapse: collapse; display: block; overflow-x: auto; margin: 0 0 10px; font-size: 14px; }
.md th, .md td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.md th { background: var(--surface-2); }
.md blockquote { margin: 0 0 10px; padding-left: 12px; border-left: 3px solid var(--border-strong); color: var(--text-muted); }
.md.plain { white-space: pre-wrap; }

/* ---------- Composer ---------- */
.composer-wrap {
  position: sticky; bottom: 0;
  padding: 12px 20px 16px;
  background: linear-gradient(to top, var(--bg) 70%, transparent);
}
.composer {
  max-width: 860px; margin: 0 auto;
  display: flex; align-items: flex-end; gap: 8px;
  padding: 8px 8px 8px 16px;
  background: var(--surface); border: 1px solid var(--border-strong); border-radius: 14px;
  box-shadow: var(--shadow);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.composer:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft), var(--shadow); }
.composer textarea {
  flex: 1; border: 0; outline: none; resize: none; background: transparent;
  padding: 9px 0; max-height: 180px; line-height: 1.45;
}
.composer-hint { max-width: 860px; margin: 6px auto 0; font-size: 12px; color: var(--text-muted); text-align: center; }

/* ---------- Done ---------- */
.done-card { max-width: 520px; margin: 80px auto; padding: 36px 28px; text-align: center; }
.done-card h1 { margin: 12px 0 8px; font-size: 24px; }
.done-card p { margin: 0 0 24px; }
.done-icon {
  width: 56px; height: 56px; margin: 0 auto; border-radius: 50%;
  display: grid; place-items: center;
  background: color-mix(in srgb, var(--success) 15%, transparent); color: var(--success);
  font-size: 28px; font-weight: 700;
}

/* ---------- Dialog ---------- */
.dialog-backdrop {
  position: fixed; inset: 0; z-index: 50;
  display: grid; place-items: center; padding: 20px;
  background: rgba(15, 23, 42, 0.5);
}
.dialog {
  width: 100%; max-width: 480px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
}
.dialog h2 { margin: 0 0 8px; font-size: 18px; }
.dialog p { margin: 0 0 8px; color: var(--text-muted); }
.dialog ul { margin: 0 0 20px; padding-left: 20px; font-size: 14px; }
.dialog li { margin: 4px 0; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; }

/* ---------- Toasts ---------- */
.toasts { position: fixed; right: 20px; bottom: 20px; z-index: 60; display: flex; flex-direction: column; gap: 8px; }
.toast {
  max-width: 360px; padding: 12px 16px; border-radius: 10px;
  background: var(--text); color: var(--bg); font-size: 14px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  animation: toast-in 0.2s ease-out;
}
.toast.error { background: var(--danger); color: #fff; }
@keyframes toast-in { from { opacity: 0; transform: translateY(8px); } }

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .topbar { padding: 10px 14px; }
  .brand-sub { display: none; }
  .how { grid-template-columns: 1fr; }
  .advanced-grid { grid-template-columns: 1fr 1fr; }
  .input-group { flex-wrap: wrap; }
  .input-group input { padding-right: 14px; }
  .input-group .btn { width: 100%; border-radius: 0; }
  .suggestions { grid-template-columns: 1fr; }
  .arena-grid { grid-template-columns: 1fr; }
  .vote-bar { grid-template-columns: 1fr 1fr; }
  /* A and B side by side on the first row, tie / both-bad below. */
  .vote-btn[data-verdict="b"] { order: -1; }
  .vote-btn[data-verdict="a"] { order: -2; }
  .setup-wrap { padding-top: 28px; }
}