* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  background: linear-gradient(135deg, #f4f1eb 0%, #ece7dc 100%);
  color: #2d2a25;
  min-height: 100vh;
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 440px;
  background: #fff;
  border-radius: 18px;
  padding: 36px 32px;
  box-shadow: 0 24px 60px -32px rgba(58, 47, 27, 0.32), 0 4px 16px -8px rgba(58, 47, 27, 0.16);
  border: 1px solid rgba(58, 47, 27, 0.08);
}

.login-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, #4a3f29 0%, #2d251a 100%);
  color: #f4f1eb;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.04em;
}

.login-brand strong {
  display: block;
  font-size: 16px;
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.login-brand small {
  font-size: 12px;
  color: #6b5c46;
  letter-spacing: 0.06em;
}

h1 {
  margin: 0 0 8px;
  font-size: 22px;
  letter-spacing: 0.02em;
}

.lead {
  margin: 0 0 20px;
  font-size: 14px;
  color: #5d513e;
}

form {
  display: grid;
  gap: 16px;
}

label {
  display: grid;
  gap: 6px;
  font-size: 13px;
  color: #5d513e;
}

input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid rgba(58, 47, 27, 0.18);
  border-radius: 10px;
  font-size: 15px;
  background: #fafaf6;
  transition: border-color 0.15s, background 0.15s;
}

input:focus {
  outline: none;
  border-color: #4a3f29;
  background: #fff;
}

.primary-action {
  appearance: none;
  border: none;
  background: linear-gradient(135deg, #4a3f29 0%, #2d251a 100%);
  color: #f4f1eb;
  padding: 13px 16px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  margin-top: 6px;
  transition: transform 0.1s, box-shadow 0.15s;
}

.primary-action:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 10px 22px -10px rgba(58, 47, 27, 0.45);
}

.primary-action:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.error {
  color: #b34538;
  font-size: 13px;
  margin: 0;
  min-height: 1em;
}

.login-footer {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid rgba(58, 47, 27, 0.1);
  display: grid;
  gap: 6px;
}

.login-footer small {
  font-size: 12px;
  color: #6b5c46;
}

.login-footer a {
  color: #4a3f29;
}