:root {
  --fog: #dfe6dc;
  --ink: #1e2a24;
  --rust: #b5522a;
  --mute: #4a6358;
}
* { box-sizing: border-box; }
html { background: var(--fog); color: var(--ink); }
body {
  margin: 0;
  min-height: 100vh;
  border-left: 8px solid var(--rust);
  font: 17px/1.5 "Trebuchet MS", "Segoe UI", sans-serif;
}
.sheet {
  max-width: 38rem;
  padding: 2.1rem 1.3rem 3.5rem 1.8rem;
}
nav { font-size: 0.84rem; margin-bottom: 2.2rem; }
nav a { color: var(--rust); text-decoration: none; margin-right: 1rem; }
nav a:hover { text-decoration: underline; }
.brand {
  font-size: 2rem;
  line-height: 1.05;
  margin: 0 0 0.4rem;
  font-weight: 700;
}
.brand em { font-style: normal; border-bottom: 4px solid var(--rust); }
.lede { color: var(--mute); margin: 0 0 1.4rem; }
.foot {
  font-size: 0.78rem;
  color: var(--mute);
  margin-top: 2.6rem;
  border-top: 1px solid #b7c4bb;
  padding-top: 0.7rem;
}
label { display: block; margin: 0.85rem 0 0.2rem; }
input[type="text"],
input[type="password"] {
  display: block;
  width: 100%;
  max-width: 22rem;
  font: inherit;
  padding: 0.4rem 0.5rem;
  border: 1px solid #7e9086;
  background: #f4f7f3;
}
button {
  display: block;
  margin-top: 0.9rem;
  font: 0.9rem/1 "Segoe UI", sans-serif;
  background: var(--ink);
  color: var(--fog);
  border: 0;
  padding: 0.55rem 0.9rem;
  cursor: pointer;
}
button:disabled { opacity: 0.55; cursor: wait; }
.err { color: var(--rust); min-height: 1.2em; margin: 0.7rem 0 0; }
a:focus, button:focus, input:focus { outline: 2px solid var(--rust); outline-offset: 2px; }