:root {
  --ink: #201d18;
  --muted: #716b61;
  --paper: #f4efe5;
  --red: #a83f2e;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  color: var(--ink);
  font-family: "Microsoft YaHei UI", "PingFang SC", sans-serif;
  background:
    radial-gradient(circle at 12% 5%, rgba(168, 63, 46, 0.18), transparent 30%),
    radial-gradient(circle at 88% 90%, rgba(77, 96, 69, 0.18), transparent 28%),
    linear-gradient(rgba(45, 38, 29, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(45, 38, 29, 0.035) 1px, transparent 1px),
    var(--paper);
  background-size: auto, auto, 24px 24px, 24px 24px;
}

.access-shell {
  min-height: 100vh;
  padding: 32px 18px;
  display: grid;
  place-items: center;
}

.access-card {
  width: min(100%, 460px);
  padding: 38px;
  border: 1px solid rgba(70, 54, 39, 0.14);
  background: rgba(255, 253, 247, 0.94);
  box-shadow: 0 28px 70px rgba(63, 48, 34, 0.15);
}

.brand-mark {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  color: #f0d9a7;
  border: 1px solid #797063;
  background: #1b1c18;
  font-family: "KaiTi", serif;
  font-size: 29px;
  transform: rotate(-3deg);
}

.eyebrow {
  margin: 24px 0 7px;
  color: #9b793f;
  font-family: Georgia, serif;
  font-size: 10px;
  letter-spacing: 0.18em;
}

h1 {
  margin: 0;
  font-family: "FangSong", "STFangsong", serif;
  font-size: clamp(32px, 8vw, 44px);
  line-height: 1.14;
  letter-spacing: 0.04em;
}

.intro {
  margin: 18px 0 25px;
  color: var(--muted);
  line-height: 1.75;
}

form,
label {
  display: flex;
  flex-direction: column;
}

form {
  gap: 16px;
}

label {
  gap: 7px;
  font-size: 13px;
  font-weight: 700;
}

label small {
  color: var(--muted);
  font-weight: 400;
}

input {
  width: 100%;
  min-height: 48px;
  padding: 0 13px;
  border: 1px solid #d7d0c4;
  border-radius: 3px;
  color: var(--ink);
  background: #fff;
  font: inherit;
  outline: none;
}

#codeInput {
  font-family: Consolas, monospace;
  font-size: 17px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

input:focus {
  border-color: var(--red);
  box-shadow: 0 0 0 3px rgba(168, 63, 46, 0.1);
}

button {
  min-height: 50px;
  margin-top: 4px;
  border: 0;
  border-radius: 3px;
  color: #fff;
  background: var(--red);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 13px 25px rgba(168, 63, 46, 0.23);
}

button:disabled {
  opacity: 0.6;
  cursor: wait;
}

.message {
  min-height: 22px;
  margin: 14px 0 0;
  color: var(--red);
  font-size: 13px;
  line-height: 1.6;
}

.message.success {
  color: #4e6a49;
}

.privacy {
  margin-top: 18px;
  padding-top: 17px;
  border-top: 1px solid #e2ddd3;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.65;
}

.privacy strong {
  color: var(--ink);
}

.privacy p {
  margin: 5px 0 0;
}

@media (max-width: 520px) {
  .access-shell {
    padding: 0;
    place-items: stretch;
  }

  .access-card {
    min-height: 100vh;
    padding: 30px 22px;
    border: 0;
  }
}