:root {
  --bg: #fafaf9;
  --bg-grad: radial-gradient(1200px 600px at 50% -200px, #eef2ff 0%, transparent 60%),
             radial-gradient(800px 400px at 100% 100%, #fef3f2 0%, transparent 50%),
             #fafaf9;
  --ink: #0f172a;
  --ink-soft: #475569;
  --ink-muted: #64748b;
  --line: #e7e7e4;
  --line-strong: #cbd5e1;
  --card: #ffffff;
  --card-hover: #ffffff;
  --accent: #4f46e5;
  --accent-deep: #4338ca;
  --accent-soft: #eef2ff;
  --ok: #059669;
  --warn: #b45309;
  --err: #dc2626;
  --card-soft: #fafafb;
  --mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, monospace;
  --max-width: 1200px;
  --page-pad-x: 2rem;
  --shadow-sm: 0 1px 2px rgba(15,23,42,0.04), 0 1px 1px rgba(15,23,42,0.02);
  --shadow-md: 0 4px 12px rgba(15,23,42,0.06), 0 2px 4px rgba(15,23,42,0.04);
  --shadow-lg: 0 20px 40px -10px rgba(15,23,42,0.12), 0 8px 16px -4px rgba(15,23,42,0.06);
  --rds-header-bg: rgba(255,255,255,0.7);
  --rds-header-ink: var(--ink);
  --rds-header-soft: var(--ink-soft);
  --rds-header-muted: #94a3b8;
  --rds-header-line: var(--line);
  --rds-header-line-hover: var(--line-strong);
  --rds-header-accent: var(--accent);
  --rds-header-cta-bg: #ffffff;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  min-height: 100vh;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--ink);
  background: var(--bg-grad);
  background-attachment: fixed;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

button {
  cursor: pointer;
}

button:disabled,
button[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
}

.spacer {
  flex: 1;
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
  padding: 1rem;
}

.panel > h2,
.panel > h3 {
  font-size: 0.72rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 180px;
}

.field label {
  font-size: 0.72rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 700;
}

.field input,
.field select,
.field textarea {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
  padding: 0.55rem 0.65rem;
  min-height: 2.35rem;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 2px solid var(--accent-soft);
  border-color: var(--accent);
}

.field textarea {
  resize: vertical;
  min-height: 4.5rem;
}

.btn {
  min-height: 2.35rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.55rem 0.8rem;
  background: #ffffff;
  color: var(--ink-soft);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}

.btn.primary {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}

.btn.danger {
  color: var(--err);
}

.btn:hover:not(:disabled) {
  border-color: var(--line-strong);
  color: var(--ink);
}

.btn.primary:hover:not(:disabled) {
  color: #ffffff;
  background: var(--accent-deep);
}

.status {
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 0.78rem;
  color: var(--ink-muted);
}

.msg {
  border-radius: 7px;
  padding: 0.45rem 0.55rem;
  font-size: 0.8rem;
  border: 1px solid var(--line);
  color: var(--ink-soft);
  background: #fafafb;
}

.msg.error {
  background: #fee2e2;
  border-color: #fecaca;
  color: #991b1b;
}

.msg.warning {
  background: #fef3c7;
  border-color: #fde68a;
  color: #78350f;
}

.empty-state {
  padding: 4rem 1rem;
  text-align: center;
  color: var(--ink-muted);
  font-size: 0.9rem;
}

.json-box {
  max-height: 180px;
  overflow: auto;
  background: #fafafb;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.65rem;
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 0.75rem;
  color: var(--ink-soft);
  white-space: pre-wrap;
}

.rds-header {
  padding: 1.25rem 2rem;
  border-bottom: 1px solid var(--rds-header-line);
  background: var(--rds-header-bg);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.rds-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.rds-brand {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  text-decoration: none;
  color: inherit;
}

.rds-brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 4px 10px rgba(79,70,229,0.25);
  flex: 0 0 38px;
}

.rds-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.rds-brand-name {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--rds-header-ink);
}

.rds-brand-tag {
  font-size: 0.78rem;
  margin-top: 2px;
  color: var(--rds-header-muted);
}

.rds-crumb {
  color: var(--rds-header-muted);
  font-size: 0.9rem;
}

.rds-crumb-sep {
  margin-left: 0.25rem;
}

.rds-crumb-current {
  color: var(--rds-header-accent);
  font-weight: 600;
}

.rds-header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.85rem;
}

.rds-header-link {
  color: var(--rds-header-soft);
  text-decoration: none;
  font-weight: 500;
}

.rds-header-link:hover {
  color: var(--rds-header-ink);
}

.rds-header-email {
  color: var(--rds-header-soft);
}

.rds-signout-btn {
  color: var(--rds-header-soft);
  background: transparent;
  border: 1px solid var(--rds-header-line);
  border-radius: 999px;
  padding: 0.35rem 0.85rem;
  font-weight: 500;
  font-size: 0.85rem;
}

.rds-signout-btn:hover {
  color: var(--rds-header-ink);
  border-color: var(--rds-header-line-hover);
}

.rds-header-cta {
  font-size: 0.85rem;
  font-weight: 600;
  color: white;
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  border: none;
  border-radius: 999px;
  padding: 0.5rem 1rem;
  box-shadow: 0 4px 10px rgba(79,70,229,0.18);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.rds-header-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 14px rgba(79,70,229,0.28);
}

.rds-header-cta.signed-in {
  background: var(--rds-header-cta-bg);
  color: var(--rds-header-soft);
  border: 1px solid var(--rds-header-line);
  box-shadow: var(--shadow-sm);
}

.rds-header-cta.signed-in:hover {
  color: var(--rds-header-ink);
}

@media (max-width: 720px) {
  .rds-header {
    padding: 1rem 1.25rem;
  }

  .rds-header-inner {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .rds-header-actions {
    width: 100%;
    margin-left: 0;
    flex-wrap: wrap;
    gap: 0.65rem;
  }
}

/* ── Page-shell utilities ─────────────────────────────────────────────── */
/* Used by every demo page so the centered max-width + horizontal padding
   stays in one place. Page-specific layouts compose these with .panel. */
.page {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  padding: 0 var(--page-pad-x) 1.5rem;
}

.intro {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  padding: 1.25rem var(--page-pad-x) 0.5rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
}
.intro strong { color: var(--ink); }
.intro em { color: var(--accent); font-style: normal; font-weight: 600; }
.intro code {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0.05rem 0.4rem;
  border-radius: 4px;
  font-size: 0.85em;
}

.controls {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  display: flex;
  gap: 0.5rem;
  padding: 1rem var(--page-pad-x);
  align-items: center;
  flex-wrap: wrap;
}
.controls label {
  font-size: 0.75rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
  margin-right: 0.2rem;
}
.controls input[type="text"],
.controls input[type="email"],
.controls input[type="number"],
.controls input[type="date"],
.controls select {
  background: var(--card);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.6rem 0.8rem;
  font-size: 0.92rem;
  font-family: inherit;
  box-shadow: var(--shadow-sm);
}
.controls input[type="text"] { flex: 1; }
.controls select { max-width: 240px; min-width: 180px; }
.controls input:focus,
.controls select:focus {
  outline: 2px solid var(--accent-soft);
  border-color: var(--accent);
}
.controls .status { padding-bottom: 0; }
.controls .status strong { color: var(--ink-soft); font-weight: 700; }

.banner {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  padding: 0 var(--page-pad-x);
}
.banner .msg { display: none; }
.banner .msg.show { display: block; }

/* ── Tool-call log + code drawer ──────────────────────────────────────── */
/* Shared by every demo that streams referee-validated tool calls. */
.calls-log-header { padding-top: 0.7rem; }
.calls-log-header h4,
.log-panel h4 {
  font-size: 0.72rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 700;
  margin-bottom: 0.4rem;
}
.calls-log-header .sub,
.log-panel .sub {
  font-size: 0.8rem;
  color: var(--ink-muted);
  margin-bottom: 0.5rem;
}
.calls-log-header .sub em,
.log-panel .sub em { font-style: italic; color: var(--ink-soft); }
.calls-log-header .sub code,
.log-panel .sub code {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0 0.3rem;
  border-radius: 3px;
  font-size: 0.9em;
}
.calls-log {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--ink-soft);
  max-height: 240px;
  overflow: auto;
}
.calls-log .ok  { color: var(--ok);  }
.calls-log .err { color: var(--err); }
.calls-log .row {
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  cursor: pointer;
}
.calls-log .row:hover  { background: var(--accent-soft); }
.calls-log .row.active { background: var(--accent-soft); outline: 1px solid var(--accent); }
.calls-log .empty { color: var(--ink-muted); font-style: italic; }

.code-drawer {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(820px, 92vw);
  max-height: 80vh;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
  display: none;
  flex-direction: column;
  z-index: 50;
  overflow: hidden;
}
.code-drawer.show { display: flex; }
.code-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.28);
  display: none;
  z-index: 40;
}
.code-backdrop.show { display: block; }
.code-drawer-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1.1rem;
  border-bottom: 1px solid var(--line);
  background: var(--card-soft);
}
.code-drawer-header .tool {
  font-family: var(--mono);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--accent);
}
.code-drawer-header .hint {
  font-size: 0.78rem;
  color: var(--ink-muted);
}
.code-drawer-header .close {
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink-soft);
  border-radius: 8px;
  padding: 0.25rem 0.65rem;
  font-family: inherit;
  font-size: 0.82rem;
  cursor: pointer;
}
.code-drawer-header .close:hover {
  color: var(--ink);
  border-color: var(--line-strong);
}
.code-drawer pre {
  margin: 0;
  padding: 1rem 1.1rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.55;
  color: var(--ink);
  overflow: auto;
  background: var(--card);
}