:root {
  --paper: #F4F5F2;
  --slip: #FFFFFF;
  --ink: #1A1D21;
  --muted: #6A7079;
  --hair: #D7DAD4;
  --accent: #2E4A9E;
  --on-accent: #FFFFFF;
  --tint: rgba(46, 74, 158, 0.07);
  --error: #A3322A;
  --serif: "Newsreader", "Iowan Old Style", Georgia, serif;
  --sans: "Instrument Sans", "Helvetica Neue", system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #15171A;
    --slip: #1D2024;
    --ink: #E7E8E4;
    --muted: #9AA0A8;
    --hair: #2C3036;
    --accent: #93A8EE;
    --on-accent: #15171A;
    --tint: rgba(147, 168, 238, 0.10);
    --error: #F0928A;
  }
}
:root[data-theme="dark"] {
  --paper: #15171A;
  --slip: #1D2024;
  --ink: #E7E8E4;
  --muted: #9AA0A8;
  --hair: #2C3036;
  --accent: #93A8EE;
  --on-accent: #15171A;
  --tint: rgba(147, 168, 238, 0.10);
  --error: #F0928A;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.5 var(--sans);
  -webkit-font-smoothing: antialiased;
}
.card {
  width: min(380px, 100%);
  border-top: 1px solid var(--hair);
  padding-top: 12px;
}
.kicker { margin: 0 0 32px; font-size: 13px; font-weight: 500; color: var(--muted); }
h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 300;
  font-size: 2.6rem;
  line-height: 1.05;
  letter-spacing: -0.015em;
}
.intro {
  margin: 16px 0 28px;
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.1rem;
  line-height: 1.45;
  color: var(--muted);
}
label { display: block; margin: 14px 0 6px; font-size: 13px; font-weight: 500; color: var(--muted); }
input {
  width: 100%;
  border: 1px solid var(--hair);
  border-radius: 3px;
  background: var(--slip);
  color: var(--ink);
  padding: 11px 12px;
  font: inherit;
  font-size: 16px;
  outline: none;
}
input:focus-visible { border-color: var(--accent); box-shadow: 0 0 0 3px var(--tint); }
button {
  width: 100%;
  margin-top: 24px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: var(--accent);
  color: var(--on-accent);
  font: 500 15px/1 var(--sans);
  padding: 13px;
  cursor: pointer;
}
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
button:disabled { opacity: 0.55; cursor: wait; }
.err { display: none; margin: 14px 0 0; font-size: 14px; color: var(--error); }