:root { color-scheme: dark; }
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 16px;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(245, 165, 36, 0.08), transparent 60%),
    radial-gradient(circle at 1px 1px, rgba(255, 255, 255, 0.045) 1px, transparent 0) 0 0 / 22px 22px,
    #0a0b0c;
  color: #ece7dc;
  font-family: 'Zen Kaku Gothic New', 'Hiragino Sans', 'Yu Gothic UI', 'Meiryo', sans-serif;
  font-weight: 500;
}
.card {
  width: min(100%, 340px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 28px 24px 24px;
  border: 1px solid #24282c;
  border-radius: 6px;
  background: #111315;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}
.mark {
  width: 30px;
  height: 30px;
  border-radius: 4px;
  background: radial-gradient(circle, #0a0b0c 0 5px, #f5a524 5.5px 7.5px, transparent 8px), #f5a524;
  box-shadow: 0 0 22px rgba(245, 165, 36, 0.35);
}
h1 { margin: 6px 0 14px; font-size: 19px; font-weight: 700; letter-spacing: 0.04em; }
h1 span { margin-left: 6px; font-family: 'Martian Mono', Consolas, monospace; font-size: 10px; letter-spacing: 0.32em; color: #8d9296; }
label { font-size: 12px; color: #8d9296; }
input {
  height: 42px;
  padding: 0 12px;
  border: 1px solid #33393e;
  border-radius: 4px;
  background: #0a0b0c;
  color: inherit;
  font-size: 16px;
}
input:focus { outline: none; border-color: #f5a524; }
.error { margin: 0; font-size: 12.5px; color: #ff4b3a; }
button {
  height: 42px;
  margin-top: 6px;
  border: 0;
  border-radius: 4px;
  background: #f5a524;
  color: #1a1205;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
button:hover { box-shadow: 0 0 16px rgba(245, 165, 36, 0.45); }