:root {
  color-scheme: light;
  --ink: #15221c;
  --paper: #f1efe7;
  --line: rgba(21, 34, 28, 0.22);
  --moss: #214f3b;
  --acid: #d7f255;
  --white: #fffdf7;
}

* { box-sizing: border-box; }

html { min-width: 320px; background: var(--ink); }

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100svh;
  color: var(--ink);
  background:
    linear-gradient(90deg, transparent 49.9%, rgba(255, 255, 255, 0.09) 50%, transparent 50.1%),
    var(--ink);
  font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

button,
input { font: inherit; }

.login-shell {
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  background: var(--paper);
}

.login-intro,
.login-card {
  min-width: 0;
  padding: clamp(32px, 6vw, 88px);
}

.login-intro {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  border-right: 1px solid var(--line);
}

.login-intro::after {
  content: "";
  position: absolute;
  width: 280px;
  height: 280px;
  right: -110px;
  top: 12%;
  border: 1px solid var(--line);
  border-radius: 50%;
  box-shadow: 0 0 0 38px rgba(21, 34, 28, 0.035), 0 0 0 76px rgba(21, 34, 28, 0.025);
}

.wordmark {
  position: absolute;
  top: clamp(28px, 5vw, 62px);
  left: clamp(32px, 6vw, 88px);
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.04em;
}

.wordmark i { display: block; width: 52px; height: 1px; background: var(--ink); }

.eyebrow,
.card-index,
.archive-note span {
  margin: 0;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 14px;
  line-height: 1.45;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.login-intro h1 {
  max-width: 720px;
  margin: 20px 0 28px;
  font-family: Georgia, "Songti SC", "STSong", serif;
  font-size: clamp(48px, 7vw, 104px);
  line-height: 1.02;
  letter-spacing: -0.065em;
  font-weight: 600;
}

.intro-copy {
  max-width: 34rem;
  margin: 0;
  font-size: clamp(17px, 1.5vw, 21px);
  line-height: 1.8;
}

.archive-note {
  display: grid;
  gap: 4px;
  width: fit-content;
  margin-top: 48px;
  padding: 18px 22px;
  border-left: 5px solid var(--acid);
  background: var(--ink);
  color: var(--white);
}

.archive-note strong { font-size: 15px; font-weight: 500; }

.login-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 34px;
  background: var(--white);
}

.card-index { color: var(--moss); }

.login-card h2 {
  margin: 0 0 12px;
  font-family: Georgia, "Songti SC", "STSong", serif;
  font-size: clamp(34px, 4vw, 58px);
  line-height: 1.15;
  letter-spacing: -0.04em;
}

.login-card > div > p { max-width: 32rem; margin: 0; color: rgba(21, 34, 28, 0.72); }

form { display: grid; gap: 12px; max-width: 520px; }

label { font-weight: 700; font-size: 15px; }

input {
  width: 100%;
  min-height: 58px;
  padding: 12px 16px;
  border: 1px solid rgba(21, 34, 28, 0.38);
  border-radius: 0;
  color: var(--ink);
  background: var(--white);
  outline: none;
}

input:focus { border-color: var(--moss); box-shadow: 0 0 0 3px rgba(33, 79, 59, 0.16); }

.form-message { min-height: 26px; margin: 0; color: #9b2f21; font-size: 14px; }

button {
  min-height: 58px;
  padding: 14px 20px;
  border: 1px solid var(--ink);
  border-radius: 0;
  color: var(--white);
  background: var(--ink);
  font-weight: 700;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease;
}

button:hover:not(:disabled) { color: var(--ink); background: var(--acid); }
button:disabled { cursor: wait; opacity: 0.7; }

.privacy-note {
  max-width: 520px;
  margin: 2px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: rgba(21, 34, 28, 0.7);
  font-size: 14px;
}

.privacy-note span { margin-right: 6px; color: var(--moss); font-size: 10px; }

@media (max-width: 820px) {
  body { background: var(--paper); }
  .login-shell { grid-template-columns: 1fr; }
  .login-intro { min-height: 56svh; border-right: 0; border-bottom: 1px solid var(--line); }
  .login-card { min-height: 44svh; }
  .login-intro h1 { font-size: clamp(48px, 15vw, 76px); }
}

@media (max-width: 460px) {
  .login-intro,
  .login-card { padding: 32px 24px; }
  .login-intro { padding-top: 96px; }
  .wordmark { top: 28px; left: 24px; }
  .login-card { gap: 26px; }
  .intro-copy { font-size: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  button { transition: none; }
}