/* Attend — classic boxy black/white UI.
   Tokens from ui-ux-pro-max design system (Minimalism/Swiss, zinc monochrome).
   Brief pins strict B/W: no accent color. Destructive red used for errors only. */
:root {
  --ink: #09090B;
  --primary: #18181B;
  --paper: #FFFFFF;
  --bg: #FAFAFA;
  --hairline: #E4E4E7;
  --muted: #475569;
  --danger: #DC2626;
  --font-body: "Fira Sans", -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --font-mono: "Fira Code", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
}
::selection { background: var(--ink); color: var(--paper); }

/* Masthead: one black anchor bar per page. */
.masthead {
  background: var(--ink);
  color: var(--paper);
  padding: 14px 16px;
}
.masthead .wrap {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}
.masthead h1 { font-size: 18px; margin: 0; font-weight: 700; letter-spacing: -0.02em; }
.masthead a { color: var(--paper); font-size: 14px; }
.masthead a:focus-visible { outline: 2px solid var(--paper); outline-offset: 2px; }

/* Page column. */
.page { max-width: 640px; margin: 0 auto; padding: 20px 16px 48px; }

/* Box: the only container. Flat, square, 1px black border. */
.box {
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 0;
  padding: 16px;
  margin: 0 0 16px 0;
}
.box > h2:first-child { margin-top: 0; }
h2 { font-size: 24px; letter-spacing: -0.02em; margin: 0 0 12px 0; }
p { margin: 0 0 12px 0; }
.muted { color: var(--muted); font-size: 14px; }
code, .token {
  font-family: var(--font-mono);
  font-size: 14px;
  background: var(--bg);
  border: 1px solid var(--hairline);
  padding: 1px 6px;
  border-radius: 0;
}
.num { font-variant-numeric: tabular-nums; }

/* Forms: real labels, 44px targets, square black-bordered inputs. */
label {
  display: block;
  font-size: 14px;
  font-weight: 700;
  margin: 12px 0 4px 0;
}
label:first-child { margin-top: 0; }
input[type="text"], input[type="password"], input[type="number"] {
  display: block;
  width: 100%;
  min-height: 44px;
  padding: 8px 10px;
  font: inherit;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 0;
}
input:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 1px;
}
.row { display: flex; gap: 12px; flex-wrap: wrap; }
.row > div { flex: 1 1 160px; min-width: 0; }

/* Buttons: one loud voice (black), one quiet voice (white/black border). */
.btn {
  display: inline-block;
  min-height: 44px;
  padding: 10px 18px;
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  border-radius: 0;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
}
.btn-quiet { background: var(--paper); color: var(--ink); }
.btn-block { display: block; width: 100%; margin-top: 16px; }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 12px; }
.btn:focus-visible, a:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}
.btn[disabled] { opacity: 0.55; cursor: default; }

/* Status + error. Errors name problem + recovery (craft floor: copy). */
.status {
  border: 1px solid var(--ink);
  padding: 10px 12px;
  margin-top: 12px;
  font-weight: 700;
}
.error { color: var(--danger); font-weight: 700; margin-top: 12px; }

/* Records: bordered table, black header row. */
table.records { width: 100%; border-collapse: collapse; margin-top: 12px; }
table.records th, table.records td {
  border: 1px solid var(--ink);
  padding: 8px 10px;
  text-align: left;
  font-size: 15px;
}
table.records th { background: var(--ink); color: var(--paper); }
table.records td.num { font-family: var(--font-mono); font-size: 14px; }
ul.records { list-style: none; margin: 12px 0 0 0; padding: 0; }
ul.records li {
  border: 1px solid var(--ink);
  border-top-width: 0;
  padding: 8px 10px;
}
ul.records li:first-child { border-top-width: 1px; }

/* QR sits in a plain bordered box. */
.qr { border: 1px solid var(--ink); padding: 12px; display: inline-block; margin: 12px 0; }
.qr img { display: block; }
.countdown { font-family: var(--font-mono); font-weight: 700; }

@media (max-width: 480px) {
  .page { padding: 16px 12px 40px; }
  .btn-row .btn { flex: 1 1 100%; text-align: center; }
}