:root {
  color-scheme: dark;
  --bg: #101114;
  --bg-soft: #15171c;
  --panel: #191c22;
  --panel-strong: #20242c;
  --control: #11141a;
  --text: #f4f6f8;
  --muted: #a5afbd;
  --line: #303743;
  --line-strong: #465160;
  --accent: #14b8a6;
  --accent-strong: #2dd4bf;
  --danger: #fb7185;
  --shadow: 0 18px 44px rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    linear-gradient(180deg, var(--bg-soft) 0, var(--bg) 340px),
    var(--bg);
  font-family:
    "Yu Gothic UI",
    "Meiryo",
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
  letter-spacing: 0;
}

button,
input {
  font: inherit;
}

.auth-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
}

.auth-panel {
  width: min(430px, 100%);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 26px;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 13px;
  margin-bottom: 24px;
}

.brand-mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: linear-gradient(135deg, var(--panel), var(--panel-strong));
  color: var(--accent-strong);
  font-weight: 900;
}

h1,
p {
  margin: 0;
}

h1 {
  font-size: 21px;
  line-height: 1.25;
}

.brand-lockup p,
.login-form span {
  color: var(--muted);
  font-size: 13px;
}

.login-form {
  display: grid;
  gap: 14px;
}

.login-form label {
  display: grid;
  gap: 7px;
}

input {
  min-height: 44px;
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: var(--control);
  color: var(--text);
  padding: 9px 11px;
  outline: none;
}

input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.22);
}

.form-message {
  min-height: 20px;
  color: var(--danger);
  font-size: 13px;
}

button {
  min-height: 44px;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 900;
  cursor: pointer;
}

button:hover {
  background: color-mix(in srgb, var(--accent) 82%, #ffffff);
}

button:disabled {
  cursor: wait;
  opacity: 0.72;
}

@media (max-width: 440px) {
  .auth-shell {
    padding: 12px;
  }

  .auth-panel {
    padding: 20px;
  }

  h1 {
    font-size: 18px;
  }
}