:root {
  --ink: #000000;
  --ink-soft: #1a1a1a;
  --muted: #6b6b6b;
  --paper: #ffffff;
  --surface: #fafafa;
  --line: #e5e5e5;
  --line-soft: #f0f0f0;
  --error: #b14545;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { background: var(--paper); color: var(--ink); }
body {
  font-family: 'Inter', ui-sans-serif, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-size: 15px;
  line-height: 1.55;
}

a { color: inherit; text-decoration: none; }

.eyebrow {
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}

.field {
  width: 100%;
  background: white;
  border: 1px solid var(--line);
  padding: 0.9rem 1rem;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--ink);
  border-radius: 0;
  transition: border-color .15s;
}
.field:focus { outline: none; border-color: var(--ink); }
.field-label {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.45rem;
  font-weight: 500;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.95rem 1.75rem;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: white;
  cursor: pointer;
  transition: all .18s ease;
  font-family: inherit;
}
.btn:hover { background: var(--ink-soft); border-color: var(--ink-soft); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: white; }

.card {
  background: white;
  border: 1px solid var(--line);
  padding: 1.5rem;
}

.divider { height: 1px; background: var(--line); width: 100%; }

.nav-link {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--muted);
  padding: 0.5rem 0;
  border-bottom: 1px solid transparent;
  transition: all .15s;
}
.nav-link:hover, .nav-link.active { color: var(--ink); border-color: var(--ink); }

.tile {
  background: white;
  border: 1px solid var(--line);
  padding: 1.75rem;
  transition: all .2s ease;
  text-align: left;
}
.tile:hover { border-color: var(--ink); transform: translateY(-2px); }

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(2rem);
  background: var(--ink);
  color: white;
  padding: 0.85rem 1.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 500;
  opacity: 0;
  transition: all .25s ease;
  z-index: 50;
  pointer-events: none;
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }

.shell { max-width: 1180px; margin: 0 auto; padding: 0 2rem; }
.shell-narrow { max-width: 460px; margin: 0 auto; padding: 0 2rem; }

@media (max-width: 720px) {
  .shell, .shell-narrow { padding: 0 1.25rem; }
  body { font-size: 14.5px; }
}