* {
  box-sizing: border-box;
}

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

.login-body {
  min-height: 100vh;
  background: #f8fafc;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.login-container {
  width: 100%;
  max-width: 720px;
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.login-book {
  display: flex;
  justify-content: center;
  align-items: center;
}

.book-svg {
  width: 100%;
  max-width: 320px;
  height: auto;
  opacity: 0.9;
}

.login-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: end;
  background: #ffffff;
  border-radius: 1rem;
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.08);
  padding: 2.5rem;
  border: 1px solid #e2e8f0;
}

.login-brand {
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

.login-logo {
  max-width: 180px;
  width: 100%;
  height: auto;
  object-fit: contain;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.login-title {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: #1e293b;
}

.login-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.login-field label {
  font-size: 0.8rem;
  color: #64748b;
  font-weight: 500;
}

.login-field input {
  padding: 0.75rem 0.9rem;
  border: 1px solid #cbd5e1;
  border-radius: 0.5rem;
  font-size: 0.95rem;
  background: #ffffff;
  color: #1e293b;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.login-field input:focus {
  outline: none;
  border-color: #4f46e5;
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.login-submit {
  margin-top: 0.5rem;
  padding: 0.85rem 1rem;
  background: #4f46e5;
  color: #ffffff;
  border: none;
  border-radius: 0.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.login-submit:hover {
  background: #4338ca;
}

.login-submit:disabled {
  background: #a5b4fc;
  cursor: not-allowed;
}

.login-error {
  min-height: 1.25rem;
  margin: 0;
  font-size: 0.85rem;
  color: #dc2626;
  font-weight: 500;
}

.login-error:empty {
  display: none;
}

@media (max-width: 640px) {
  .login-container {
    padding: 1.5rem;
    gap: 1.5rem;
  }

  .login-content {
    grid-template-columns: 1fr;
    align-items: center;
    padding: 1.75rem;
    gap: 1.5rem;
  }

  .login-brand {
    justify-content: center;
  }

  .login-logo {
    max-width: 140px;
  }

  .book-svg {
    max-width: 220px;
  }
}