:root {
  --obsidian: #1A1A1E;
  --graphite: #2E2E34;
  --slate: #4A4A54;
  --ash: #B0B0B8;
  --mist: #E0E0E4;
  --white: #F5F5F7;
  --paper: #FFFFFF;
  --font: "Helvetica Neue", Helvetica, "TeX Gyre Heros", Arial, sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--white);
  color: var(--slate);
  font: 400 16px/1.5 var(--font);
}
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }

.top { background: var(--paper); border-bottom: 1px solid var(--mist); }
.top .wrap { padding-top: 20px; padding-bottom: 20px; }
.top-lockup { display: block; width: 460px; max-width: 100%; height: auto; }

h1, h2, h3 { color: var(--obsidian); font-weight: 700; margin: 0; }
h1 { font-size: 28px; line-height: 1.2; margin-top: 40px; }
h2 { font-size: 20px; line-height: 1.3; padding-bottom: 8px; border-bottom: 2px solid var(--obsidian); }
h3 { font-size: 16px; color: var(--graphite); }
.lede { margin: 4px 0 0; }
section { margin-top: 48px; }
.note { margin: 12px 0 0; font-size: 14px; }
code { font: 13px/1 ui-monospace, Menlo, Consolas, monospace; color: var(--obsidian); }

/* signature */
.sig-grid { display: grid; gap: 24px; margin-top: 20px; }
@media (min-width: 860px) { .sig-grid { grid-template-columns: 300px 1fr; } }
.fields { display: grid; gap: 12px; align-content: start; }
.fields label { display: grid; gap: 4px; font-size: 13px; font-weight: 700; color: var(--graphite); }
.fields input {
  font: 400 15px/1.4 var(--font); color: var(--obsidian);
  padding: 9px 10px; border: 1px solid var(--ash); border-radius: 4px; background: var(--paper); width: 100%;
}
.fields input:focus { outline: 2px solid var(--obsidian); outline-offset: 1px; border-color: var(--obsidian); }
.sig-out { min-width: 0; }
.sig-preview {
  background: var(--paper); border: 1px solid var(--mist); border-radius: 4px;
  padding: 24px 20px; overflow-x: auto;
}
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
button {
  font: 700 14px/1 var(--font); padding: 11px 16px; border-radius: 4px; cursor: pointer;
  border: 1px solid var(--obsidian); background: var(--paper); color: var(--obsidian);
}
button.primary { background: var(--obsidian); color: var(--white); }
button:focus-visible { outline: 2px solid var(--obsidian); outline-offset: 2px; }
button.small { font-size: 12px; padding: 6px 9px; font-weight: 400; border-color: var(--ash); }
.status { min-height: 1.5em; margin: 8px 0 0; font-size: 14px; color: var(--obsidian); }
.host { margin: 4px 0 0; font-size: 13px; overflow-wrap: anywhere; }
.host.warn { color: var(--obsidian); font-weight: 700; }

/* files */
.group { margin-top: 28px; }
.group .note { margin-top: 4px; }
.cards { display: grid; gap: 16px; margin-top: 12px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .cards { grid-template-columns: 1fr 1fr; } }
.card { background: var(--paper); border: 1px solid var(--mist); border-radius: 4px; overflow: hidden; min-width: 0; }
.tile { height: 140px; display: flex; align-items: center; justify-content: center; padding: 20px; }
.tile img { max-width: 100%; max-height: 100%; height: auto; }
.tile.light { background: var(--paper); border-bottom: 1px solid var(--mist); }
.tile.dark { background: var(--obsidian); }
.tile.none {
  border-bottom: 1px solid var(--mist);
  background: repeating-conic-gradient(var(--mist) 0 25%, var(--paper) 0 50%) 0 0 / 16px 16px;
}
.tile.none img { max-height: 100px; }
.card h4 { margin: 0; padding: 12px 14px 4px; font-size: 14px; color: var(--obsidian); }
.files { list-style: none; margin: 0; padding: 0 14px 12px; }
.files li {
  display: flex; align-items: center; gap: 8px; padding: 6px 0; border-top: 1px solid var(--mist); font-size: 13px;
}
.files li:first-child { border-top: 0; }
.files a { color: var(--obsidian); font-weight: 700; text-decoration: none; overflow-wrap: anywhere; }
.files a:hover { text-decoration: underline; }
.files .meta { color: var(--slate); white-space: nowrap; }
.files .grow { flex: 1; min-width: 0; }

.rules { margin: 16px 0 0; padding-left: 20px; }
.rules li { margin: 6px 0; }

.foot { margin-top: 64px; border-top: 1px solid var(--mist); background: var(--paper); font-size: 13px; }
.foot .wrap { padding-top: 20px; padding-bottom: 24px; }