:root {
  --bg: #f7f5ef;
  --card: #ffffff;
  --ink: #17140f;
  --muted: #746a5c;
  --border: #e4dcc9;
  --accent: #b3441f;
  --accent-dark: #8f3517;
  --danger: #b3261e;
  --danger-bg: #fbeae7;
  --warning: #c9820a;
  --warning-bg: #fdf1dc;
  --success: #1e7a4c;
  --success-bg: #e8f4ec;
  --radius: 3px;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }

/* --- masthead rule --- */
body { border-top: 3px solid var(--ink); }

/* --- nav --- */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1080px;
  margin: 0 auto;
  padding: 26px 24px;
  border-bottom: 1px solid var(--border);
}
.nav .brand {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 9px;
}
.nav .brand .dot {
  width: 9px; height: 9px; border-radius: 1px;
  background: var(--accent);
  flex-shrink: 0;
}
.nav .links { display: flex; align-items: center; gap: 24px; font-size: 13px; font-weight: 600; }
.nav .links a.muted { color: var(--muted); letter-spacing: 0.02em; }
.nav .links a.muted:hover { color: var(--ink); }

/* --- buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 13px 22px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  font-family: var(--sans);
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-primary:hover:not(:disabled) { background: var(--accent-dark); border-color: var(--accent-dark); }
.btn-primary:disabled { opacity: 0.55; cursor: not-allowed; }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--ink); }

/* --- shared surface --- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.spinner {
  display: inline-block;
  width: 13px; height: 13px;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

footer {
  text-align: center;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  padding: 44px 24px;
  border-top: 1px solid var(--border);
}